CN102589878A - Portable type wet type clutch detection data collecting system and fault diagnosis method - Google Patents

Abstract

The present invention relates to a portable wet clutch detection data acquisition system and a fault diagnosis method. 1) A detection data acquisition system is provided, which includes a magnetoelectric speed sensor, a current pressure sensor, a data acquisition instrument, a hand-held terminal and several Wet clutch and gearbox of several transmission shaft speed measuring gears; 2) Connect magnetoelectric speed sensor, current pressure sensor, wet clutch, data acquisition instrument and hand-held terminal; 3) Start the vehicle to run in neutral and hand-held terminal and Data acquisition instrument; 4) Observe the status of the received signal through the handheld terminal; 5) Perform fault diagnosis on the data of each measured point for each magnetoelectric speed sensor and each current pressure sensor; 6) After completing the detection of a certain gear, Replace the transmission gear and repeat the detection; 7) After completing the signal acquisition and fault diagnosis in all gears, the result output module in the handheld terminal will output the collected data and fault diagnosis results. The invention can be widely applied in wet clutches of various crawler vehicle gearboxes.

Description

A Portable Wet Clutch Detection Data Acquisition System and Fault Diagnosis Method

technical field

The invention relates to a data acquisition system and a fault diagnosis method, in particular to a portable detection data acquisition system and a fault diagnosis method for a wet clutch of a gearbox of a crawler vehicle.

Background technique

At present, the wet clutch fixed-shaft gearbox is widely used in many crawler vehicles and construction machinery. The gearbox is an organic synthesis of mechanical, electrical, hydraulic and other technologies. Its technical features such as automatic transmission have complete functions and advanced technical level. With the rapid improvement of gearbox performance and informatization level, the failure rate has also increased. How to carry out effective condition monitoring and fault diagnosis of gearboxes, control its operation status, ensure operation quality, and timely For maintenance and repair, these issues have increasingly received great attention from manufacturers and users. Practice has proved that the most prominent and important thing in gearbox fault diagnosis is how to monitor the wet shift clutch, a common faulty component, in real vehicles. Therefore, it is of great significance to develop a wet clutch state detection data acquisition system in tracked vehicles and construction machinery gearboxes and to study fault diagnosis methods.

At present, the existing tracked vehicle gearbox fault diagnosis system mainly has the following problems: 1. The signal isolation module, signal conditioning module and signal acquisition module in the data acquisition system are independent of each other, and the unified integrated micro-circuit design has not been realized, resulting in the acquisition system. The signal conditioning box and the data acquisition box are composed of two parts, which is not conducive to the requirements of the portability and convenience of the test instrument for the actual vehicle test. 2. When the hydraulic signal is collected, a flexible high-pressure oil pipe is used to transfer the transmission hydraulic oil to the pressure measuring valve plate, and a pressure sensor is installed on the pressure measuring valve plate to measure the pressure. Although the above device plays a role of pressure buffer and protects the sensor, the hydraulic pressure The length of the oil pipe caused the distortion of the dynamic pressure waveform test, making it difficult to diagnose the fault. 3. Although a separate lithium battery box is used for power supply to ensure the quality of sensor signal acquisition, the volume of the lithium battery box is too large, and the integration of the battery and the acquisition instrument has not been achieved, which makes it difficult to place and fix the battery box during the actual vehicle test. 4. Too many sensors are installed, resulting in long installation time, difficult and time-consuming on-site operation. 5. Although the data acquisition system uses a PXI chassis and a high-speed A/D conversion module to ensure real-time signal acquisition, the entire chassis is too large to meet the portability and miniaturization requirements of the vehicle-mounted data acquisition system. 6. Fault diagnosis is only based on the judgment of a single signal limit value, the diagnosis result is simple, and the real fault location and fault prediction have not been realized. 7. Excessive pursuit of comprehensive and powerful fault diagnosis system, resulting in inaccurate diagnosis results.

Contents of the invention

In view of the above problems, the object of the present invention is to provide a portable wet clutch detection data acquisition system and a fault diagnosis method that are easy to carry, simple to operate, wide in scope of application, and capable of online real-time detection.

In order to achieve the above object, the present invention adopts the following technical solutions: a portable wet clutch detection data fault diagnosis method, which includes the following steps: 1) a detection data acquisition system is set, which includes a magnetoelectric speed sensor, a current pressure sensor, A data acquisition instrument, a handheld terminal and a gearbox containing several wet clutches and several transmission shaft speed measuring gears, among which, the handheld terminal is equipped with a data receiving module, a fault diagnosis module, a display module, a result output module, and a data storage module and power supply; 2) Connect the magnetoelectric speed sensor and current pressure sensor to the wet clutch in the gearbox through cables, and connect the data acquisition instrument and the handheld terminal; 3) Start the handheld terminal while the vehicle is running in neutral and data acquisition instrument; 4) observe the status of the received signal through the display module in the handheld terminal, if all the signals are normal, then perform the shift operation, and test the cyclic shift of the gear position during the driving of the vehicle; 5) each magnetoelectric The speed sensor and each current pressure sensor transmit the data of each measured point to the data acquisition instrument, and transmit it to the fault diagnosis module of the handheld terminal for fault diagnosis. If the diagnosis result is normal, the data storage module stores the collected data; If the diagnosis result shows that a certain wet clutch is faulty, the display module will display the fault information in real time, and complete the storage of fault information and data collection; 6) After completing the detection of a certain gear, replace the gear of the gearbox, and repeat the step 5) , until the signal acquisition and fault diagnosis under all gears are completed; 7) After the signal acquisition and fault diagnosis under all gears are completed, the result output module in the handheld terminal outputs the collected data and fault diagnosis results.

In the step 5), the fault diagnosis method in the fault diagnosis module includes the following steps: (1) Calculate the oil pressure buffer time according to the received wet clutch working oil pressure signal, and judge the wet clutch according to the preset technical indicators. Whether the buffer time of the oil pressure during the clutch engagement process is too long or too short, if it is too long or too short, then accumulate and record the number of occurrences, and proceed to the next step; otherwise, continue to shift gears to check whether the buffer time is too long or too short; ( 2) Determine whether the ratio of the number of times the buffer time is too long or too short to the total number of shifts reaches the fault setting value. If it reaches the fault setting value, it will prompt that the wet clutch is faulty. Otherwise, continue to shift gears to detect whether the buffer time is too long or too short; (3) Synchronously with the step (1), detect the gear fault according to the working oil pressure signal of the wet clutch and the speed signal of the speed measuring gear of the transmission shaft: (i) check whether the working oil pressure signal pressure of the wet clutch is normal, if normal, Then, according to the wet clutch in the combined state, it is determined as the gear position of the current gearbox, which is the current hydraulic gear position, and the display value of the current hydraulic gear position is stored as the last hydraulic gear position, and the shift detection is continued; otherwise, prompt Pressure failure; (ii) Calculate the transmission ratio according to the speed signal of the speed measuring gear of the transmission shaft, and judge whether the transmission ratio is equal to the transmission ratio value of a certain gear. If it is equal, the current mechanical gear will be displayed, and the display value of the mechanical unit will be stored as For the last mechanical gear position, continue the gear shift detection; otherwise, it will prompt the transmission ratio failure; (iii) compare the last hydraulic gear position in the step (i) and step (ii) with the last mechanical gear position and judge that it is both The gears are consistent, if they are consistent, continue to shift detection, otherwise, prompt gear failure; (4) continue to shift to detect whether the working oil pressure signal of the wet clutch is normal, calculate the two speed signals in the transmission shaft test gear sensor Whether the ratio is equal to the transmission ratio of a certain gear, and detect gear failure: (i) If the pressure is normal, display the current hydraulic gear, and compare the hydraulic gear with the last hydraulic pressure in step (3)(i) Compare the gear position to judge whether the gear is skipped. If the gear position is the same and there is no gear jump, continue the gear shift detection; otherwise, it will prompt the gear fault; (ii) if the transmission ratio is equal to the transmission ratio of a certain gear, the current mechanical gear will be displayed. , and compare the mechanical gear position with the last mechanical gear position in step (3)(ii) to determine whether the gear is skipped, if the gear positions are consistent and there is no skipped gear, then continue the gear shift detection; otherwise, the gear position failure is prompted; ( 5) Compare the current hydraulic gear position in the step (4) with the current mechanical gear position to determine whether the gear positions are consistent, if they are consistent, continue the gear shift detection, otherwise, prompt the current gear position failure.

A portable wet clutch detection data acquisition system for implementing the above detection data fault diagnosis method is characterized in that it includes a fixed shaft gearbox, a magnetoelectric speed sensor, a current pressure sensor, a data acquisition instrument and a hand-held terminal. The data acquisition instrument is equipped with a signal conditioning module, an A/D conversion module and a data sending module; the gearbox contains several wet clutches and several transmission shaft speed measuring gears, and each of the wet clutches is connected to the The magnetoelectric speed sensor, each of the transmission shaft speed measuring gears is also connected to the current pressure sensor through a conversion joint; the speed signal of the transmission shaft speed measuring gear is collected by the magnetoelectric speed sensor and then sent to the In the data acquisition instrument; the working oil pressure signal of the wet clutch is sent to the data acquisition instrument after being collected by the current pressure sensor, and the signal conditioning module in the data acquisition instrument will receive the speed signal After the working oil pressure signal is conditioned and the interference signal is removed, it is sent to the A/D conversion module to be converted into a digital signal, and sent to the handheld terminal by the data sending module to complete the collection of wet clutch detection data .

The handheld terminal includes a data receiving module, a fault diagnosis module, a result output module, a display module, a data storage module and a power supply. Power supply with the data acquisition instrument; the data receiving module receives the data transmitted by the data transmission module in the data acquisition instrument, and sends the data to the fault diagnosis module, and the diagnosis results are sent to the result output module and the display module respectively and in the data storage module, the result output module outputs the diagnosis result, and the display module displays the diagnosis result.

The power supply adopts a lithium-ion battery, and the lithium-ion battery is integrated and packaged with the handheld terminal.

The data transmission mode between the data sending module in the data acquisition instrument and the data receiving module in the handheld terminal adopts the CAN bus transmission mode.

The data transmission mode between the data sending module in the data acquisition instrument and the data receiving module in the handheld terminal adopts a wireless transmission mode.

The signal conditioning module in the data acquisition instrument includes a bandpass filter, a frequency-voltage conversion module, two voltage isolation modules, a low-pass filter and a signal conversion module; the speed signal collected by the magnetoelectric speed sensor is passed through the The bandpass filter is input into the frequency-voltage conversion module, and the frequency signal is converted into a voltage signal and then input into the voltage isolation module to complete isolation and anti-interference and then output; the working oil pressure signal collected by the current pressure sensor The signal is input into the signal conversion module through the low-pass filter, the current signal is converted into a voltage signal, and then input into another voltage isolation module for isolation and output.

The present invention has the following advantages due to the adoption of the above technical scheme: 1. The present invention carries out data acquisition due to the use of a data acquisition instrument, which is composed of a signal conditioning module, an A/D conversion module and a data output module. Functions such as conditioning, signal isolation, analog-to-digital conversion, and data transmission are integrated together, which realizes the integration and miniaturization of circuit design, reduces the volume of the data acquisition system, and ensures the portability of the system. 2. In the present invention, since the battery in the handheld terminal adopts a lithium-ion battery, the lithium-ion battery is integrated with the handheld display terminal, which ensures the use of a stable lithium power supply for separate power supply, reduces the interference received by the acquisition signal, and improves The integration of the whole system improves the convenience of real vehicle operation. 3. The present invention uses a conversion joint to directly connect the current pressure sensor with the gearbox, canceling the high-pressure oil pipe and pressure measuring valve plate used in the prior art, thus ensuring the real-time performance of dynamic pressure signal collection and reducing data The composition of the acquisition system further improves the portability of the system. 4. The signals detected by the present invention only include the working oil pressure signal of the wet clutch and the rotational speed signal of the speed measuring gear of the transmission shaft, and the number of test signals is small, which shortens the time for system installation before the actual vehicle test, reduces the workload, and saves It reduces equipment cost, simplifies system configuration, and improves system portability. 5. The data collected by the data acquisition system in the present invention utilizes the CAN bus transmission mode, which not only ensures the real-time performance of signal transmission, but also realizes the requirement of long-distance data transmission. 6. Since the data acquisition system of the present invention can adopt the CAN bus transmission mode for data transmission, it can also adopt the wireless transmission mode for data transmission, which greatly improves the convenience of operation during the actual vehicle test. 7. Since the fault diagnosis module adopted in the present invention is to detect faults based on the historical process data of gearbox shifting, and the object of fault detection is a wet clutch, the fault judgment is more accurate. 8. Since the present invention is equipped with a display module in the handheld terminal, it can display the diagnosis result, fault information and fault location in real time, the diagnosis process is fast, the diagnosis result display is intuitive and easy to understand, and the system is easy to operate. The invention can be widely applied in wet clutches of various crawler vehicle gearboxes.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

Fig. 2 is a schematic structural diagram of the handheld terminal of the present invention;

Fig. 3 is the structural representation of the signal conditioning module in the data acquisition instrument of the present invention;

Fig. 4 is a system work flowchart of the present invention;

Fig. 5 is a fault diagnosis flow chart of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1, the portable wet clutch detection data acquisition system of the present invention comprises fixed shaft gearbox 1, magnetoelectric speed sensor 2, current pressure sensor 3, data acquisition instrument 4 and hand-held terminal 5, data acquisition instrument 4 is provided with a signal conditioning module 6, an A/D conversion module 7 and a data sending module 8. Among them, the gearbox 1 contains several wet clutches 9 and several transmission shaft speed measuring gears 10, each wet clutch 9 is connected to the magnetoelectric speed sensor 2 through a conversion joint, and each transmission shaft speed measurement gear 10 is also connected through a conversion joint Connect the current type pressure sensor 3, and take a wet clutch 9 and a transmission shaft speed measuring gear 10 in the gearbox 1 as examples below.

The speed signals of the transmission shaft speed measuring gear 10 in the gearbox 1 are all collected by the magnetoelectric speed sensor 2 and sent to the data acquisition instrument 4; the working oil pressure signals of each wet clutch 9 in the gearbox 1 are all collected by the current pressure sensor 3 Send into the data acquisition instrument 4 after collecting. The signal conditioning module 6 in the data acquisition instrument 4 conditions the received speed signal and working oil pressure signal and removes the interference signal, then sends it to the A/D conversion module 7 and converts it into a digital signal, and sends it to the The handheld terminal 5 completes the collection of wet clutch detection data.

As shown in Fig. 1 and Fig. 2, the handheld terminal 5 of the present invention includes a data receiving module 51, a fault diagnosis module 52, a result output module 53, a display module 54, a data storage module 55 and a power supply 56, and the power supply 56 is a handheld terminal Each component in 5 supplies power, and supplies power to the magnetoelectric speed sensor 2, the current pressure sensor 3 and the data acquisition instrument 4 at the same time. The data receiving module 51 receives the data transmitted by the data sending module 8, and sends the data to the diagnosis in the fault diagnosis module 52, and the diagnosis results are sent to the result output module 53, the display module 54 and the data storage module 55 respectively, and the result output module 53 Output the diagnosis results in the form of files or reports, and display the diagnosis results by the display module 54, so as to remind the user when a fault occurs.

In the above embodiments, the power supply 55 may be a lithium-ion battery, and the lithium-ion battery is integrated with the handheld terminal 5 and packaged.

In the above-mentioned embodiments, the data transmission mode between the data sending module 8 and the data receiving module 51 may adopt a CAN bus transmission mode, or may adopt a wireless transmission mode. When the CAN bus transmission mode is adopted, the CAN bus adopts the dual-channel USBCAN-II form, one channel transmits the speed signal, and the other channel transmits the pressure signal, which can ensure the data transmission capacity and transmission rate. The length of the CAN bus communication cable is designed in sections, and the length can be flexibly increased or shortened according to the needs of the actual vehicle.

In the above embodiments, the working voltages of the magnetoelectric speed sensor 2 and the current pressure sensor 3 are both DC 24V. The connecting cables between the components in the portable wet clutch detection data acquisition system of the present invention adopt double-layer shielded high-temperature cables, and the outer sheath of the cables is protected by silica gel. The maximum working temperature can reach 180 degrees, that is, high temperature resistance and fire prevention.

In each of the above-mentioned embodiments, as shown in Figure 3, the signal conditioning module 6 in the data acquisition instrument 4 includes a bandpass filter 61, a frequency-voltage conversion module 62, two voltage isolation modules 63, a low-pass filter 64 and a signal conversion Module 65. The speed signal collected by the magnetoelectric speed sensor 2 is input into the frequency-voltage conversion module 62 through the band-pass filter 61, the frequency signal is converted into a voltage signal, and then input into the voltage isolation module 63 to complete the isolation and anti-interference output; the current pressure The working oil pressure signal collected by the sensor 3 is input into the signal conversion module 65 through the low-pass filter 64, the current signal is converted into a voltage signal, and then input into another voltage isolation module 63 for isolation and output.

As shown in Figure 4, the portable wet clutch fault diagnosis method of the present invention is based on the portable wet clutch detection data acquisition system, based on the actual structural characteristics of the tracked vehicle gearbox and the wet clutch working pressure index, to realize the detection of the wet clutch of the gearbox Online detection and fault diagnosis, the specific steps are as follows:

1) Connect the magnetoelectric speed sensor 2 and the current pressure sensor 3 to the internal wet clutch 9 of the gearbox 1 through a cable, and connect the data acquisition instrument 4 and the hand-held terminal 5;

2) Start the hand-held terminal 5 and the data collector 4 while starting the vehicle to run in neutral;

3) Observing the received signal status through the display module 54 in the hand-held terminal 5, if all the signals are normal, then perform the gear shift operation, and test the cyclic gear shift of the gear position during the running of the vehicle;

4) Each magnetoelectric speed sensor 2 and each current type pressure sensor 3 transmit the data of each measured point to the data acquisition instrument 4, and after being converted by the signal conditioning module 6 and the A/D conversion module 7, the data is transferred via wireless transmission or CAN The bus transmission mode enters the fault diagnosis module 52 of the hand-held terminal 5 to carry out fault diagnosis. If the diagnosis result is normal, the data storage module 55 stores and collects data; Display fault information, complete fault information storage and collection data storage;

5) After completing the detection of a certain gear position, the handheld terminal 5 will prompt that the signal acquisition and storage of the gear position has been completed, whether to continue the signal acquisition, at this time, change the gear position of the gearbox 1, and repeat steps 3) and 4) until Complete signal acquisition and fault diagnosis in all gears;

6) After completing the signal collection and fault diagnosis in all gears, the handheld terminal 5 will generate a fault diagnosis report by the result output module 53 according to the collected data and fault diagnosis records, and can print out the results.

As shown in Figure 5, the fault diagnosis method in the fault diagnosis module 52 in above-mentioned step 4) comprises the following steps:

(1) Calculate the oil pressure buffer time according to the received working oil pressure signal of the wet clutch 9, and judge whether the oil pressure buffer time during the combination process of the wet clutch 9 is too long or too short according to the preset technical indicators. or too short, then accumulatively record the number of occurrences, and proceed to step (2); if the buffer time is neither too long nor too short, then continue shift detection to determine whether the buffer time is too long or too short.

(2) Determine whether the ratio of the number of times the buffer time is too long or too short to the total number of shifts reaches the fault setting value. If it reaches the fault setting value, it will prompt the fault of the wet clutch 9. If it does not reach the fault setting value, it will not prompt the clutch. Fault information, then continue to shift detection, to determine whether the buffer time is too long or too short.

(3) Synchronously with step (1), detect the gear failure according to the working oil pressure signal of the wet clutch 9 and the speed signal of the transmission shaft speed measuring gear 10 in the gearbox 1:

(i) Detect whether the pressure of the working oil pressure signal is normal according to the received working oil pressure signal of the wet clutch 9, if the pressure is normal, then determine the gear position of the current gearbox 1 according to the wet clutch 9 in the combined state, the gear position is the current hydraulic gear position, and display the current hydraulic gear position, store the displayed value of the current hydraulic gear position as the last hydraulic gear position, continue the shift detection, and perform step (iii); if the pressure is abnormal, it will prompt a pressure fault.

(ii) Calculate the transmission ratio according to the rotational speed signal of the speed measuring gear 10 of the transmission shaft, judge whether the transmission ratio is equal to the transmission ratio value of a certain gear, if so, display the current mechanical gear, and store the displayed value of the mechanical unit as the last time For mechanical gears, continue the shift detection and proceed to step (iii); otherwise, a transmission ratio failure is indicated.

(iii) Comparing the last hydraulic gear position in the above step (i) and step (ii) with the last mechanical gear position, it is judged that both gears are consistent, if they are consistent, continue the gear shift detection and proceed to step (4), otherwise , prompting gear failure.

(4) Continue shifting to detect whether the working oil pressure signal pressure of the wet clutch 9 is normal, calculate whether the ratio of the two speed signals in the transmission shaft test gear sensor 2 is equal to the transmission ratio of a certain gear, and judge whether the detection gear is faulty:

(i) If the pressure is normal, display the current hydraulic gear position, and compare the hydraulic gear position with the previous hydraulic gear position in step (3)(i) to determine whether the gear is skipped. If the gears are consistent and there is no gear jump, then Proceed to step (5) for gear shift detection; otherwise, a gear fault is indicated.

(ii) If the transmission ratio is equal to the transmission ratio of a certain gear, the current mechanical gear will be displayed, and the mechanical gear will be compared with the last mechanical gear in step (3)(ii) to determine whether to skip the gear, if If the gear positions are the same and there is no gear skipping, then continue the gear shift detection and proceed to step (5); otherwise, a gear position fault is prompted.

(5) Compare the current hydraulic gear position in step (4) with the current mechanical gear position to determine whether the gear positions are consistent. If they are consistent, continue the gear shift detection, otherwise, prompt the current gear position failure.

In the above steps, the test quantity of the working oil pressure signal of the wet clutch 9 varies with the type of the gearbox 1, and only the oil pressure buffer time of the wet clutch 9 with buffer function is calculated in the test. The number of rotational speed signal acquisitions of transmission shaft speed measuring gear 10 is also determined by the number of transmission shafts of gearbox 1, and it is required to test the rotational speed of each transmission shaft from the input shaft to the output shaft.

The above-mentioned embodiments are only used to illustrate the present invention, and the structure and connection mode of each component can be changed. On the basis of the technical solution of the present invention, all improvements to the connection and structure of individual components according to the principles of the present invention and equivalent transformations shall not be excluded from the protection scope of the present invention.

Claims (8)

1. a portable wet clutch detects the data fault diagnostic method, and it may further comprise the steps:

1) is provided with one and detects data acquisition system (DAS); It comprises magnetoelectric tachometric transducer, current type pressure transducer, data collecting instrument, handheld terminal and contains several wet clutches and the wheel box of several transmission shaft measure speed gearses; Wherein, be provided with data reception module, fault diagnosis module, display module, output module, data memory module and power supply as a result in the handheld terminal;

2) magnetoelectric tachometric transducer and current type pressure transducer are connected through wet clutch in cable and the wheel box, and connect data collecting instrument and handheld terminal;

When 3) starting the operation of vehicle neutral gear, start handheld terminal and data collecting instrument;

4) observe receiving state signal through display module in the handheld terminal, if all signals are normal, then carry out gear-change operation, the gear shift cycling to gear in the vehicle ' process is tested;

5) each magnetoelectric tachometric transducer is given data collecting instrument with each current type pressure transducer with each measured point data delivery; And transfer in the fault diagnosis module of handheld terminal and carry out fault diagnosis; If diagnostic result is normal, then by data memory module storage of collected data; If diagnostic result shows a certain wet clutch fault, then show failure message in real time by display module, accomplish failure message storage and acquisition data storage;

6) after a certain gear of completion detects, change the wheel box gear, repeating said steps 5), until signals collecting and the fault diagnosis accomplished under all gears;

7) accomplish signals collecting and fault diagnosis under all gears after, by in the handheld terminal as a result output module with image data and fault diagnosis result output.

2. a kind of portable wet clutch as claimed in claim 1 detects the data fault diagnostic method, it is characterized in that: in the said step 5), the method for diagnosing faults in the said fault diagnosis module may further comprise the steps:

(1) according to the wet clutch operating oil pressure calculated signals oleo cushion time that receives; And the predefined technical indicator of foundation judges whether the surge time of oil pressure in the wet clutch cohesive process is long or too short; If long or too short, then the number of times of bulk registration appearance carries out next step; Otherwise whether the continuation gear shift detects surge time long or too short;

(2) judge whether surge time long or too short number of times reaches the fault setting value with the ratio of total shift number, if reach, then points out this wet clutch fault, otherwise whether continuing gear shift, to detect surge time long or too short;

(3) synchronous with said step (1), detect the gear fault according to the operating oil pressure signal of wet clutch and the tach signal of transmission shaft measure speed gears:

(i) whether detection wet clutch operating oil pressure signal pressure is normal; If normal, then confirm as gear when front gear box according to the wet clutch that is in bonding state, this gear is current hydraulic pressure gear; And current hydraulic pressure gear displayed value is stored as hydraulic pressure gear last time, continue gear shift and detect; Otherwise, the prompting pressure fault;

(ii) the tach signal according to the transmission shaft measure speed gears calculates ratio of gear, judges whether this ratio of gear equals the gear ratio value of certain gear, if equal, then shows current mechanical gear, and this mechanical-type unit displayed value is stored as machinery gear last time, continues gear shift and detects; Otherwise, prompting ratio of gear fault;

(iii) said step (i) and step hydraulic pressure gear last time in is (ii) judged it is that all gear is consistent with machinery gear contrast last time,, then continue gear shift and detect if consistent, otherwise, the gear fault pointed out;

(4) whether the operating oil pressure signal pressure of continuation gear shift detection wet clutch two tach signal ratios whether normal, that calculate in the transmission shaft testing gears sensor are equaling the ratio of gear of certain gear, and detect the gear fault:

(i) if pressure is normal, then show current hydraulic pressure gear, and hydraulic pressure gear contrast last time in (i) of this hydraulic pressure gear and step (3) is judged whether trip stop not have a trip stop, then continue the gear shift detection if gear is consistent; Otherwise, prompting gear fault;

(ii), then show current mechanical gear, and should the machinery gear judge whether trip stop not have a trip stop, then continue the gear shift detection if gear is consistent with machinery gear contrast last time of step (3) in (ii) if ratio of gear equals the ratio of gear of a certain gear; Otherwise, prompting gear fault;

(5) current hydraulic pressure gear in the said step (4) and current mechanical gear are compared, judge whether gear is consistent,, then continue gear shift and detect if consistent, otherwise, current gear fault pointed out.

3. a realization portable wet clutch that detects the data fault diagnostic method according to claim 1 or claim 2 detects data acquisition system (DAS); It is characterized in that: it comprises fixed axle gearbox, magnetoelectric tachometric transducer, current type pressure transducer, data collecting instrument and handheld terminal, is provided with signal condition module, A/D conversion module and data transmission blocks in the said data collecting instrument; Said wheel box contains several wet clutches and several transmission shaft measure speed gearses; Each said wet clutch all connects said magnetoelectric tachometric transducer through X-over, and each said transmission shaft measure speed gears also all connects said current type pressure transducer through X-over;

The tach signal of said transmission shaft measure speed gears is sent in the said data collecting instrument after by said magnetoelectric tachometric transducer collection; The operating oil pressure signal of said wet clutch is sent in the said data collecting instrument after by the collection of said current type pressure transducer; Signal condition module in the said data collecting instrument is with tach signal that receives and operating oil pressure signal condition and after removing undesired signal; Send into the internal conversion of said A/D conversion module and become digital signal; And be sent to said handheld terminal by said data transmission blocks, accomplish the collection that wet clutch is detected data.

4. a kind of portable wet clutch as claimed in claim 3 detects data acquisition system (DAS); It is characterized in that: said handheld terminal comprises data reception module, fault diagnosis module, output module, display module, data memory module and power supply as a result, and said power supply is each parts and magnetoelectric tachometric transducer, current type pressure transducer and data collecting instrument power supply in the said handheld terminal; Said data reception module receives the data of data transmission blocks transmission in the said data collecting instrument; And data are sent in the said fault diagnosis module; Diagnostic result is sent to respectively in said output module as a result, display module and the data memory module; Said output module is as a result exported diagnostic result, and said display module demonstrates diagnostic result.

5. a kind of portable wet clutch as claimed in claim 4 detects data acquisition system (DAS), and it is characterized in that: said power supply adopts lithium ion battery, said lithium ion battery and the integrated encapsulation of said handheld terminal.

6. a kind of portable wet clutch as claimed in claim 4 detects data acquisition system (DAS), it is characterized in that: the employing of the data transfer mode between data reception module CAN bus transmission model in data transmission blocks and the said handheld terminal in the said data collecting instrument.

7. a kind of portable wet clutch as claimed in claim 4 detects data acquisition system (DAS), it is characterized in that: the employing of the data transfer mode between data reception module wireless transmission method in data transmission blocks and the said handheld terminal in the said data collecting instrument.

8. detect data acquisition system (DAS) like claim 3 or 4 or 5 or 6 or 7 described a kind of portable wet clutches, it is characterized in that: the signal condition module in the said data collecting instrument comprises BPF., presses modular converter, two voltage isolation modules, low-pass filter and signal conversion module frequently; The tach signal that said magnetoelectric tachometric transducer collects is imported said frequency through said BPF. and is pressed in the modular converter, frequency signal is converted to accomplish to isolate with anti-interference back in the said voltage isolation module of input behind the voltage signal export; The operating oil pressure signal that said current type pressure transducer collects converts current signal to and isolates back output behind the voltage signal in another said voltage isolation module of input in said low-pass filter is imported said signal conversion module.

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