WO2006038309A1

WO2006038309A1 - Electric brake device

Info

Publication number: WO2006038309A1
Application number: PCT/JP2004/015092
Authority: WO
Inventors: Toshio Manaka
Original assignee: Hitachi, Ltd.
Priority date: 2004-10-06
Filing date: 2004-10-06
Publication date: 2006-04-13
Also published as: JPWO2006038309A1; JP4825668B2

Abstract

There has been a problem that a vehicle cannot be stopped or parked because of braking force by tires being not available when a parking brake lock mechanism or an electric brake mechanism fails. To solve such a problem, an electric brake device with a parking brake mechanism is constructed such that, when the parking brake lock mechanism or an electric brake mechanism fails, braking force can be maintained by putting a transmission of a vehicle into a connected state, or by controlling the direction of the tire (toe angle) of each wheel independently, or by applying regenerative brake or reverse torque by a motor generator. More specifically, when the parking brake lock mechanism or the electric brake mechanism fails, braking force required for stopping or parking the vehicle can be achieved by putting the transmission into a connected state or controlling the toe angle of the tire independently to produce resistance in a driving system and rolling resistance of tires, or by regenerative brake or reverse torque produced by the motor generator.

Description

Electric brake device

Technical field

Light

The present invention relates to an automobile brake device, and more particularly, a parking brake mechanism that can maintain a braking force even when the power of an electric brake device that electrically generates a braking force is turned off, and an electric brake that electrically generates a braking force. This relates to a method for controlling a vehicle when either of them fails.

Background art

JP-A-6 2-6 4 6 6 4 discloses a diagnosis of the parking brake and assists the start of the hill using another braking assist device (hydraulic check valve) when the parking brake fails. Yes.

Japanese Patent Laid-Open No. 2 0 0 1-1 0 6 0 4 7 discloses a device that prevents forgetting to apply the parking brake.

JP-A 6-2 7 8 5 83, JP-A 2 0 0 0- 3 0 9 2 5 5, JP-A 5- 1 7 0 0 6 7, Japanese Patent Application Laid-Open Nos. 20 0 1-1 0 6 0 5 8, and Japanese Patent Application Laid-Open No. 8-2 4 4 5 9 6.

Japanese Patent Application Laid-Open No. 2000-101600 discloses that a failure of a conventional parking brake using a wire is detected.

Further, braking force control and spin control by tire toe angle control are disclosed in Patent 0 2 5 5 1 5 8 3 and Patent 0 2 7 6 8 7 3 8.

The parking brake device described in the above-mentioned prior art has a malfunction that prevents the parking brake from being hooked (the parking brake is applied). No) There was no consideration for maintaining the brake state at times. Therefore, there was a problem when parking was not possible due to a failure of the parking brake device. Another problem was that the vehicle could not be stopped when the electric brake failed.

Therefore, the present invention provides an electric brake device that can reliably stop and park a vehicle even when either of such a conventional parking brake mechanism or an electric brake that electrically generates braking force breaks down. It is aimed. Disclosure of the invention

The present invention includes a function for electrically controlling connection / disconnection of a vehicle transmission, a function for controlling ON / OFF of star start for starting an engine based on a switch operation signal, an engine, When there is a brake failure that has at least one of the functions to generate regenerative braking force (regenerative braking) or reverse torque by the generator or motor installed in the vehicle, and the function to arbitrarily and independently control the direction of tires on each wheel It has a braking force generator. This makes it possible to stop and park the vehicle even when the parking brake mechanism that can hold the braking force during the power switch OFF cannot be locked.

Further, according to the present invention, the vehicle cannot move in the resistance force of the driving force transmission system due to the transmission connection and the direction of the tire of each wheel in the event of a failure in which the braking force for parking by the parking brake mechanism cannot be maintained. It is characterized by performing control to ensure parking braking force during parking by changing the direction independently.

Thus, according to the present invention, the parking brake cannot be applied. Even in the event of a failure or failure where the electric brake cannot be applied, the driving resistance force due to the transmission connection, increased tire rolling resistance by changing the direction of the tire on each wheel (toe angle control), regenerative braking by the motor generator , Stops and parks reliably due to reverse torque. Brief Description of Drawings

FIG. 1 is a preferred system configuration diagram according to the present invention. FIG. 2 is an explanatory diagram of an electric brake with a parking brake mechanism according to an embodiment of the present invention. FIG. 3 is a diagram showing an example of a combination pattern of tire corners. FIG. 4 is an operation logic circuit diagram when the electric parking brake lock mechanism of the present embodiment fails. FIG. 5 is an operational logic circuit diagram of the present embodiment when it is activated overnight. FIG. 6 is an operation logic circuit diagram when the electric brake mechanism of the present embodiment fails. FIG. 7 is a flowchart of the present embodiment corresponding to FIG. FIG. 8 is a flowchart of the present embodiment corresponding to FIG. FIG. 9 is a flowchart of the present embodiment corresponding to FIG. BEST MODE FOR CARRYING OUT THE INVENTION

In order to explain the present invention in more detail, this will be described with reference to the accompanying drawings.

The electric brake device according to the present invention achieves the purpose of stopping and parking with a minimum number of parts even when the parking brake cannot be applied or when the electric brake cannot be applied. This simplifies the redundant system.

According to one embodiment of the present invention, a vehicle transmission is connected or disconnected. Function to electrically control the connection, start star start to start engine ¾ Function to control ON — 0 FF based on start switch operation signal, regenerative braking force by generator or motor mounted on engine ( Regenerative brake) A function that generates at least one of the functions of generating reverse torque and the function of controlling the direction of tires on each wheel independently and arbitrarily shall be the braking force generator when a brake fails. The braking force generator at the time of a brake failure may be provided with at least one of the above four functions. Also, it may be a braking force generator in the event of a brake failure with multiple functions. You may choose from these multiple functions. It is also possible to use a combination of these functions.

In other words, according to the embodiment of the present invention, in the event of a failure in which the braking force cannot be maintained for parking by the parking brake mechanism, the resistance force of the driving force transmission system is generated by the transmission connection, and the tire of each wheel. Control is performed to realize the generation of parking braking force during parking by independently changing the direction of the vehicle so that the vehicle cannot move, the generation of regenerative braking force by the motor generator, and the generation of reverse torque.

In this way, according to the present invention, even when the parking brake cannot be applied or when the electric brake cannot be applied, the driving resistance force due to the transmission connection and the change in the tire direction of each wheel ( The tire can be stopped and parked with certainty by increasing the rolling resistance of the tire due to the single-point control, regenerative braking by the motor generator, and reverse torque.

In addition, the vehicle body control after such stopping and parking is performed according to a predetermined flow as shown in the following embodiment, for example, by disconnecting the transmission. The engine can be changed.

FIG. 1 is a system configuration diagram showing an embodiment of the present invention. The brake controller 1 detects the amount of depression of the brake pedal 2 by the driver. The brake stroke sensor signal from the brake sensor 3, parking brake that controls the operation of the parking brake mechanism. —Key switch signal 4 (eg ONZO FF signal), vehicle power switch

Key switch signal 5 (for example, ignition key switch), vehicle speed sensor signal 6 from the vehicle speed sensor indicating the speed of the vehicle, engine speed sensor signal 7 indicating the engine speed, and whether the gear is connected or disconnected Parking Z neutral switch signal 8 (For example, if it is ON, it is disconnected, and if it is OFF, it is in the connected state), accelerator pedal sensor signal 9 indicating the driver's accelerator pedal depression amount 9, Gear position of the steering angle sensor signal 1 1 from the steering angle sensor for detecting the steering angle of the driver's handle 1 1 and the driver's transmission 1 3 The shift lever 1 position switch 1 5 etc. is input.

Based on these input signals, the brake controller 1 sends a control signal for obtaining the required braking force to the electric brake (EMB) 2 2 and a control signal for obtaining the required steering to the steering actuator. Output to 24 overnight.

The electric brake (EMB) 2 2 and the steering actuary 2 4 are mounted on each wheel, and are controlled independently from the brake controller 1 by each wheel.

In response to the ON NZO FF signal of the switch signal, the brake controller 1 controls the start of the switch 1 2 to start the engine 14. In response to the shift lever shift lever position switch signal 15, the brake controller 1 controls the transmission 13 to be disconnected (parking position, neutral position) and connected (reverse, drive range, low speed range).

In response to the accelerator pedal sensor signal 9, the output of the engine 14 is also controlled by the brake controller 1.

The engine 14 is equipped with an electric throttle throttle, and the amount of air taken into the engine 14 can be increased or decreased by controlling the motor in the throttle throttle. This controls the engine output.

A motor generator 16 is provided between the engine 14 and the transmission 13 so that regenerative braking (energy regeneration during deceleration by power generation) or reverse torque by the motor can be applied. The reverse torque of the regenerative brake and the motor is controlled by the brake controller 1.

FIG. 2 is an explanatory diagram of an electric brake (EMB) 22 with a parking brake mechanism. The electric brake (E, MB) 2 2 is a screw mechanism that converts the rotational motion of the motor 2 6 and the motor into a reciprocating motion, a locking mechanism that mechanically locks the reciprocating motion of the screw, and a lock for the locking mechanism. (Fixed) Unlocked (released) parking brake mechanism 2 1, Brake pad that presses brake disk 2 3 with screw mechanism to generate specified braking force, Thrust sensor to detect actual braking force It is composed of

The parking brake mechanism 21 is composed of a small motor 26 and a screw mechanism. The motor-driven brake mechanism is used to unlock the electric brake screw mechanism. With this structure, the brake is applied until a predetermined braking force is obtained by the rotational force of the motor With the pad pressed against the brake disc 2 3, the parking brake mechanism 2 1 can hook the screw mechanism. As a result, the braking force is maintained even if the rotational force (current value) of the motor 26 is zero. Abnormalities before capping the screw mechanism can be detected by checking the disconnection of the motor connection. In addition, abnormalities in the electric brake mechanism can be detected when the necessary braking force (pressing force) is not obtained by the thrust sensor 28, and overheating of the electric brake motor 27 can be detected by the built-in temperature sensor, power consumption, It can be detected by the estimated temperature estimated from the operating frequency.

Fig. 3 shows several combinations of tire directions (toe angles) so that the vehicle can be stopped by changing the angle of the tire when the parking brake mechanism or electric brake mechanism fails. Is. Each indicates the direction of the tire on each wheel when the vehicle is viewed from directly above. This is the concept of ski pogen. The rolling resistance (braking force) increases as the tire toe angle opens outward or closes inward.

Such a pattern can be selected in advance, but it can also be selected according to the stop state of the vehicle body.

FIG. 4 is an operation logic circuit diagram when the electric parking brake lock mechanism malfunctions and the parking brake switch malfunctions (always OFF) according to the present invention. With brake pedal 2 0 N (depressed), key switch 5 (vehicle power switch) is OFF, vehicle speed O kmZ h (stopped), engine speed 0 rpm (stopped), engine Either king brake lock mechanism failure or parking brake kiss failure, connect to transmission gear position 1st gear or reverse, or control the wheel toe angle of each wheel to one of the patterns in Fig. 3. As a result, the rolling resistance of the tire increases and the vehicle can be stopped. Parking brake switch 4 ON condition is entered in OR condition If the parking brake switch 4 is normal, it is connected to the transmission gear position 1st speed or reverse according to the parking brake switch, or the tire toe angle of each wheel is This is so that the pattern can be controlled.

FIG. 5 is an operational logic circuit diagram when the engine is started in the present invention. Brake pedal 2 ON (depressed) key switch 5

When the vehicle power switch is 0 N, the vehicle speed is O kmZ h (stopped), the engine speed is O rpni (stopped), the parking brake lock mechanism is broken, or the parking brake switch is broken. Start star evening 1 2 after the gear position of transmission 1 3 is disconnected. This prevents the engine from starting when the transmission is connected.

FIG. 6 is an operation logic circuit diagram when the electric brake mechanism of the present invention is faulty and in the electric brake operation limit mode. Brake pedal 2 ON (depressed) key switch 5 (vehicle power switch) is ON, vehicle speed> 0 kmZ h

(Running state) and engine speed> 5 0 0 rpm (engine normal operation state) If the electric brake mechanism is faulty or the electric brake operation restriction mode is set and the parking brake switch is OFF, the transmission gear position is 1st speed or reverse. Or control the toe angle of each wheel tire to one of the patterns shown in Fig. 3. As a result, the rolling resistance of the tire increases and braking force can be applied to the vehicle. The toe angle of the tire is continuously variable according to the brake pedal stroke or pedaling force by the steering actuate 24. In the case of the pattern (b) in Fig. 3, the larger the brake pedal depression amount, The rolling resistance can be increased by changing the angle of the corner inward. Transmission gear position 1st gear Alternatively, braking with tire toe angle control may be performed when sufficient deceleration cannot be obtained even when connected in reverse.

FIG. 7 is a flowchart of the present invention corresponding to FIG. Step

In 90, input the signals for each side, and in step 91, determine parking brake lock mechanism failure and parking brake switch failure. In step 100, it is determined whether the conditions in FIG. 4 are satisfied. In the case of Y E S, connect to transmission gear position 1st speed or reverse at step 1 0 1, or control the toe angle of each wheel to one of the patterns in Fig. 3. If it is N0 at Step 1 0 0, it is judged at Step 1 0 2 whether the parking brake lock mechanism is normal.

1 0 3 determines whether the parking brake switch is normal. If YES, the electric parking brake control according to the parking brake switch operation signal is performed in step 1 0 4, and the processing in step 1 0 1 is canceled. If N 0 at step 1 0 2, the brake pedal 〇 N (the brake pedal is depressed) at step 1 0 6 and if the engine speed is greater than the predetermined value, the processing of step 1 0 1 is cancelled. Yes (transmission disconnected, tire toe angle control released). If NO in Step 1 0 3, the brake pedal has been depressed for a predetermined time or more. If the vehicle speed = 0 km / h, the engine speed = 0 rpm, and the key switch ○ FF, the electric parking brake is activated. FIG. 8 is a flowchart of the present invention corresponding to FIG. In step 200, various signal input processing is performed, and in step 200, parking brake lock mechanism failure determination and parking brake switch failure determination are performed. In step 2 0 2, it is determined whether the conditions in FIG. 5 are satisfied. If YES, disconnect the transmission at step 2 0 3 and allow the engine to start in the evening and start the engine. If NO, 2 0 4 prohibits star start and does not start the engine. This prevents engine starting (the vehicle moving) when the transmission is connected.

FIG. 9 is a flowchart of the present invention corresponding to FIG. In step 300, various signal input processing is performed, and in step 300, electric brake mechanism failure determination and electric brake operation restriction determination are performed. Specifically, it can be judged by whether a predetermined pressing force cannot be obtained by the thrust sensor or whether the electric brake motor is overheated. In step 3 0 2, it is determined whether the conditions in FIG. 6 are satisfied. If YES, connect the transmission gear position to 1st speed or reverse in step 303, or control the corner of the tire on each wheel to one of the patterns in Fig. 3. The tire corner is continuously variable according to the brake pedal stroke or pedaling force according to steering action 24, and in the case of Fig. 3 / \ ° turn (b), the amount of brake pedal depression is large. The rolling resistance can be increased by changing the toe angle toward the inner side. Transmission gear position If sufficient deceleration cannot be obtained even if connected to 1st gear or reverse gear, braking by controlling the toe angle of the tire may be performed. The vehicle can also be stopped by regenerative braking or reverse torque generated by a motor generator. If NO at step 3 0 2, determine whether the electric brake mechanism is normal at step 3 0 4. If YES, determine at step 3 0 5 whether the electric brake operation is restricted. If NO, step 3 0 6 To perform electric brake control according to the brake pedal operation signal and cancel the processing in step 303. Even if YES at step 3 0 5, electric brake control is performed according to the brake pedal operation signal at step 3 0 7, and the processing at step 3 0 3 is canceled. However, a warning lamp is turned on and caution is given to stop the vehicle immediately. If NO in step 3 0 4, it is determined in step 3 0 8 whether the accelerator pedal is depressed. If YES, the engine output is controlled in step 3 0 9 according to the accelerator pedal. At that time, the processing of step 303 is canceled, a warning light is turned on, and attention is paid to stop the vehicle immediately. Industrial applicability

As described above, the brake device, the control device thereof, and the control method thereof according to the present invention can be applied to a vehicle brake device, and the hydraulic pressure is driven not only by the electric brake device using the motor but also by the motor. It can also be applied to brake devices that control braking force.

Claims

The scope of the claims

1. A brake comprising: an electric brake that generates a braking force on a vehicle wheel; a parking brake mechanism that can maintain the braking force even when power is not supplied to the electric brake; and a controller that controls the braking force of the electric brake. The controller includes any one of a function of electrically controlling connection / disconnection of a vehicle transmission and a function of arbitrarily controlling the direction of the tire of each wheel independently. A braking force generation unit in the event of a brake failure, and when the braking force cannot be maintained by the parking brake mechanism, the transmission is connected to the transmission by the braking force generation unit in the event of a brake failure. At least one of the following: or the tire direction of each wheel is independently changed to a direction in which the vehicle cannot move This brake system is characterized by controlling braking force to ensure braking force.

2. The brake system according to claim 1, wherein the transmission is connected so that a gear for reducing a transmission gear ratio is connected.

3. In claim 1, the vehicle further has a function of controlling start of a star for starting the engine based on a star switch operation signal, and in a parking state in which the transmission is in a connected state. In engine start, the engine's star switch signal is turned on, the brake pedal is depressed to ensure a predetermined braking force, and the transmission is switched to a disconnected state. The brake system is characterized by detecting the presence of the engine, starting the engine, and starting the engine.

4. an electric brake for generating braking force on the wheels of the vehicle; and the electric brake A brake system comprising a controller for controlling the braking force of the vehicle, wherein the controller independently controls the connection / disconnection of a vehicle transmission and the direction of the tire of each wheel independently. A braking force generation unit at the time of a brake failure provided with any of the functions of controlling the motor, and when the braking force cannot be retained by the electric brake, the braking force generation unit at the time of the brake failure causes the transformer to Connect the transmission to generate resistance force of the driving force transmission system, or change the direction of the tire of each wheel independently to the direction in which the coefficient of friction between the tire and the road surface increases, or the engine The braking force during deceleration is controlled by controlling at least one of the regenerative braking force generated by the generator or motor mounted on the Brake system characterized by securing.

5. A brake controller for controlling a braking force of an electric brake that generates a braking force on a table wheel having a parking brake mechanism that can maintain a braking force even when power is not supplied, the controller being a vehicle transmission A braking force generator for braking failure having either a function of electrically controlling connection / disconnection of the wheel and a function of arbitrarily controlling the direction of the wheel of each wheel independently. When the braking force cannot be maintained by the parking brake mechanism, the braking force generation unit at the time of the brake failure generates a resistance force of the driving force transmission system by connecting the transmission, or each wheel The braking force of the electric brake is generated by controlling at least one of independently changing the tire direction to a direction in which the vehicle cannot move. Brake controller.

6. The brake controller according to claim 5, wherein the transmission is controlled to be connected to a gear that lowers a transmission gear ratio. '

7. The apparatus according to claim 5, further comprising a function of controlling start of the engine for starting the engine based on a switch operation signal, wherein the transmission is in a connected state. When starting the engine in the parking state, the engine star switch signal is turned ON, the brake pedal is depressed to ensure a predetermined braking force, and the transmission is in a disconnected state. A brake controller characterized by detecting that it has been switched, and operating the star evening to control engine start.