JP2022085068A - Control device of vehicle brake - Google Patents

Abstract

To provide a control device of a vehicle brake that can prevent actuation of a parking brake from being forgotten when parking a vehicle, prevent unrecommended operation of parking the vehicle with only a parking lock actuated, and eliminate the necessity for excessively setting durability of driving-system components such as a parking gear.SOLUTION: A control device of a vehicle brake comprises: a shift operation part 19 that can select a shift position of a vehicle 10 including a parking range; a parking lock 30 that can restrict rotation of an output shaft 16 of a transmission 12 of the vehicle 10; an electric parking brake 20 that applies braking force for parking to a driving wheel 14 of the vehicle 10; an electric parking brake switch 21 that turns on or off actuation of the parking brake 20; and a control part 40 that actuates the electric parking brake switch 21 and then actuates the parking lock 30, when the shift operation part 19 selects the parking range, in a state where the electric parking brake switch 21 is turned off.SELECTED DRAWING: Figure 3

Description

The present invention relates to a vehicle brake control device.

There is an automatic transmission equipped with a parking lock mechanism that makes the parking gear in the transmission non-rotatable when the parking range (P) of the shift lever provided near the driver's seat is selected. Further, the vehicle is provided with a parking brake that is activated by pressing a switch provided near the driver's seat when the vehicle is parked or stopped for a long time. These brakes, which are usually mounted on vehicles, operate independently.

In Patent Document 1, in a vehicle having a shift-by-wire parking lock mechanism, a parking range is selected and the stop position is a slope in order to prevent slipping that occurs when parking is locked on a slope. , A technique is disclosed in which the operating state of the wheel brake (foot brake) is maintained and the operating state of the wheel brake (foot brake) is released when the parking lock process is completed.

Japanese Unexamined Patent Publication No. 2008-307996

On the other hand, when the driver operates the shift lever to select the parking range (P) and the parking lock mechanism is activated, the vehicle is maintained in the parked state. Therefore, the driver parks the vehicle without operating the parking brake. There was a case that it ended up.

For example, if the parking state of the vehicle is maintained only by the parking lock mechanism without operating the parking brake on a slope, a large load (twist) may be generated on the parking gears and drive system parts constituting the parking lock mechanism. Will be. Therefore, it is necessary to take measures such as improving the durability quality of drive system parts such as parking gears so that they can withstand such a situation.

The present invention has been made to solve such a problem, and it is possible to prevent the parking brake from being forgotten to be activated when the vehicle is parked, and to prevent an unrecommended operation in which only the parking lock is activated. , Provide a vehicle brake control device that does not require excessive setting of durability quality of drive system components such as parking gears.

The present invention has been made to solve at least a part of the above-mentioned problems, and can be realized as the following aspects or application examples.

The vehicle brake control device according to this application example has a shift operation unit that can select the shift position of the vehicle including the parking range, and an output of the transmission of the vehicle when the parking range is selected by the shift operation unit. A parking lock that restrains the rotation of the shaft, a parking brake that can apply a braking force for parking to the wheels of the vehicle, a parking switch that turns on or off the operation of the parking brake, and a state in which the parking switch is off. A control unit that activates the parking brake and then activates the parking lock when the parking range is selected by the shift operation unit.

The vehicle brake control device configured in this way is used even when the driver forgets to operate the parking brake when the parking range is selected by the driver and the parking lock is activated when the vehicle is parked. By automatically activating the parking brake under control, it is possible to prevent the parking brake from being forgotten to be activated when the vehicle is parked, to prevent the unrecommended operation of parking only the parking lock, and to drive the parking gear, etc. It is not necessary to excessively set the durability quality of system parts.

It is a schematic block diagram of the vehicle to which the control device of the vehicle brake which concerns on one Embodiment of this invention is applied. It is a block diagram of the control system of the control device of the vehicle brake which concerns on one Embodiment of this invention. It is a flowchart which shows the brake cooperation control routine executed by the control device of the vehicle brake which concerns on one Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a vehicle 10 to which the vehicle brake control device 1 according to the embodiment of the present invention is applied. The vehicle 10 travels when a power generation unit 11 such as an engine or a traveling motor generates a driving force, and the driving force is transmitted to the left and right drive wheels 14 via the power transmission unit 12 and the drive shaft 13. .. The output shaft (not shown) of the power generation unit 11 is connected to the input shaft (not shown) of the transmission 15 (including the speed reducer) in the power transmission unit 12, and the output shaft 16 of the transmission 15 is a differential mechanism 17. It is connected to the drive shaft 13 via. It should be noted that the front and rear means the front and back of the vehicle, the up and down means the up and down in the vertical direction (vertical direction) of the vehicle, and the left and right means the left and right in the vehicle width direction of the vehicle.

The vehicle 10 also includes an electric parking brake 20 (parking brake) that applies and holds a braking force to the drive wheels 14 when parked. The electric parking brake 20 is, for example, a so-called motor-on caliper type having a caliper-integrated structure in which an electric actuator for a parking brake is integrated with a caliper that is a braking force generating mechanism, and is a disc rotor 18 that rotates together with a drive wheel 14. It is arranged by sandwiching a part of the outer circumference. The caliper includes a pair of brake pads arranged facing each other so as to sandwich the disk surface of the disc rotor 18 from both the left and right sides, and these brake pads move toward each other or separate from each other by the operation of the electric actuator for the parking brake. Move in the direction. In this way, the braking force for parking is applied and held by the operation of the electric parking brake 20, and the parking state of the vehicle is maintained. Although not shown, the electric parking brake 20 may be provided not only on the drive wheels 14 but also on each wheel including the driven wheels and the like. Further, apart from the electric parking brake 20, a foot capable of gripping the disc rotor 18 of each wheel according to the operation of the brake pedal of the driver's seat of the vehicle 10 and mainly applying a braking force from deceleration to stop of the vehicle 10. The brake mechanism is also mounted on the vehicle 10.

The vehicle 10 further includes a parking lock 30 on the output side of the output shaft 16 of the transmission 15. The parking lock 30 restrains the rotation of the output shaft 16 by engaging a lock lever with a claw with a fixed gear provided on the output shaft 16 of the transmission 15 of the vehicle 10. The parking lock 30 includes an electric actuator for parking lock, and the lock lever with a claw is driven by operating the electric actuator for parking lock. In this way, the parking lock 30 restrains the output shaft 16 of the transmission 15 and keeps the vehicle parked.

The vehicle 10 also includes a shift operation unit 19 and an electric parking brake switch 21 (parking switch) near the driver's seat.

The shift operation unit 19 is, for example, a shift lever provided near the driver's seat. The shift positions that can be selected in the shift operation unit 19 include a parking range (P) selected when parking, a neutral range (N) in which the gear of the transmission 15 is neutral, a drive range (D) selected when traveling forward, and reverse. There is a reverse range (R) that is sometimes selected, a manual range (M) that can manually shift up or down the shift stage, and the like. Further, the shift operation unit 19 has a function of generating a signal at the selected shift position.

The electric parking brake switch 21 is an operation switch that operates (on) and releases (off) the electric parking brake 20 by the operation of the driver. The electric parking brake switch 21 is provided in front of the driver's seat, and is, for example, a button-type electric parking brake switch that is turned on and off by being pressed by the driver. The electric parking brake switch 21 has a function of generating a signal of its on / off state.

Each part of the vehicle 10 configured in this way is connected to the control unit 40 mounted on the vehicle 10. The control unit 40 is a control unit composed of an electronic arithmetic unit, for example, an ECU, which can communicate with each component of the vehicle brake control device 1 and various sensors via a communication network such as CAN (Control Area Network). be. In the present embodiment, the control unit 40 mainly operates according to a predetermined program installed in advance and has a function of controlling the electric parking brake 20 and the parking lock 30. The control unit 40 may be composed of a plurality of control units. For example, the control unit that controls the electric parking brake 20 and the control unit that controls the parking lock 30 may cooperate to execute the following control. ..

FIG. 2 is a block diagram of the control system of the vehicle brake control device 1 according to the embodiment of the present invention. With reference to this figure, the configuration and function of the vehicle brake control device 1 will be described below.

The vehicle brake control device 1 includes an electric parking brake 20, a parking lock 30, an electric parking brake switch 21, a shift operation unit 19, and a control unit 40 communicatively connected to these. The control unit 40 includes a cooperative operation determination unit 41, an electric parking brake control unit 42, and a parking lock control unit 43, which are connected to each other so as to be communicable with each other.

The electric parking brake (EPB) 20 has a function of generating and releasing a braking force on the drive wheels 14 by controlling the operation of the electric actuator for the parking brake by the electric parking brake control unit 42. Further, the electric parking brake 20 includes an electric parking brake operation sensor 22 that detects the operating state of the electric parking brake 20, and has a function of generating a signal indicating an operating state or a release state of the electric parking brake 20. Here, the operating state of the electric parking brake 20 means a state in which the operation of the electric actuator for the parking brake is completed and the braking force is applied, and the released state means the state in which the electric actuator for the parking brake is released. , It is assumed that the braking force is released.

The parking lock 30 has a function of restraining the output shaft 16 of the transmission 15 by controlling the operation of the parking lock electric actuator by the parking lock control unit 43. Further, the parking lock 30 includes a parking lock operation sensor 31 for detecting that the lock lever is engaged, for example, a limit switch, and has a function of generating a signal indicating an operation state or a release state of the parking lock 30. Here, the operating state of the parking lock 30 means a state in which the lock lever is engaged with the fixed gear, and the released state means a state in which the lock lever is disengaged from the fixed gear.

The control unit 40 also has a function of acquiring information from the electric parking brake 20, the electric parking brake operation sensor 22, the parking lock 30, the parking lock operation sensor 31, the electric parking brake switch 21, and the shift operation unit 19. There is.

When the parking range is selected by the shift operation unit 19 while the electric parking brake switch 21 is off, the cooperative operation determination unit 41 operates the electric parking brake 20 and then the parking lock 30. It has a function to determine whether or not it is necessary. Specifically, the cooperative operation determination unit 41 receives shift position information from the shift operation unit 19, on / off information from the electric parking brake switch 21, and electric parking brake from the electric parking brake operation sensor 21 and the parking lock operation sensor 31. The operation state / release state information of each of the 20 and the parking lock 30 is acquired. Then, the cooperative operation determination unit 41 cooperates when the electric parking brake switch 21 is off, the electric parking brake 20 and the parking lock 30 are in the released state, and the parking range is selected by the shift operation unit 19. It is determined that the operation is necessary, the cooperative operation request information is generated, and the cooperative operation request information is transmitted to the electric parking brake control unit 42 and the parking lock control unit 43.

The electric parking brake control unit 42 has a function of controlling the operation or release of the electric parking brake 20 based on the information from the electric parking brake switch 21, the electric parking brake operation sensor 22, and the cooperative operation determination unit 41. Specifically, it is as follows. The electric parking brake control unit 42 acquires the operation state information of the electric parking brake 20 from the electric parking brake operation sensor 22 at predetermined time intervals or at arbitrary timings from the electric parking brake operation sensor 22. Further, when the electric parking brake control unit 42 acquires the ON information from the electric parking brake switch 21, the electric parking brake 20 operates the electric parking brake 20 if the electric parking brake 20 is currently released. Further, the electric parking brake control unit 42 controls to operate the electric parking brake 20 even when the cooperative operation request information is acquired from the cooperative operation determination unit 41. On the other hand, when the electric parking brake control unit 42 acquires the off information from the electric parking brake switch 21, the electric parking brake 20 is released if the electric parking brake 20 is currently in the operating state.

The parking lock control unit 44 has a function of controlling the operation or release of the parking lock 30 based on the information from the shift operation unit 19, the electric parking brake operation sensor 22, the parking lock operation sensor 31, and the cooperative operation determination unit 41. Has. Specifically, it is as follows. The parking lock control unit 44 acquires operation state / release state information from the electric parking brake operation sensor 22 and the parking lock operation sensor 31 at predetermined time intervals or at arbitrary timings. Then, as a general rule, when the parking lock control unit 44 acquires the information that the parking range is selected from the shift operation unit 19, the parking lock 30 operates the parking lock 30 if the parking lock 30 is currently released. However, when the parking lock control unit 44 acquires the cooperative operation request information from the cooperative operation determination unit 41, the parking lock 30 is released after acquiring the information that the electric parking brake 20 is in the operating state from the electric parking brake operation sensor 22. Control to operate. On the other hand, when the parking lock control unit 44 acquires the information that the shift position is changed to other than the parking range from the shift operation unit 19, the parking lock 30 is released if the parking lock 30 is currently in the operating state.

When the electric parking brake switch 21 is off in the cooperative operation determination unit 41 and parking is selected in the shift operation unit 19, the control unit 40 of the vehicle brake control device 1 configured in this way is configured. After operating the electric parking brake 20, the brake linkage control for operating the parking lock 30 can be performed.

FIG. 3 shows a flowchart showing a brake cooperation control routine executed by the vehicle brake control device 1 according to the embodiment of the present invention, and will be described below with reference to the same flowchart. The control routine is started in a state where the vehicle 10 is stopped by the driver, the electric parking brake switch 21 is turned off, and a shift position other than the parking range is selected as the shift position of the shift operation unit 19. Further, in FIG. 3, the electric parking brake is referred to as EPB.

First, as step S1, the control unit 40 acquires the on / off state of the electric parking brake switch (EPB switch) 21 in the cooperative operation determination unit 41, and determines whether or not the electric parking brake switch 21 is in the on state. (Switch judgment). If the determination result is true (Yes), the process proceeds to the branch routine from step S2 to step S4 in which the normal operation is performed, while if the determination result is false (No), the branch routine from step S5 to step S8 in which the cooperative operation is performed is performed. move on.

As step S2, the control unit 40 controls the electric parking brake (EPB) 20 to be operated in the electric parking brake control unit 42, and proceeds to step S3.

As step S3, the control unit 40 determines in the parking lock control unit 44 whether or not the shift position of the shift operation unit 19 has been changed to the parking range. If the determination result is true (Yes), the process proceeds to step S4. On the other hand, in the case of false (No), step S3 is repeated.

As step S4, the control unit 40 activates the parking lock 30 in the parking lock control unit 44 to end the routine.

On the other hand, in step S5, that is, when it is determined to be false (No) in the switch determination in step S1, the cooperative operation determination unit 41 determines whether or not the shift position of the shift operation unit 19 has been changed to the parking range. (Shift position judgment). If the determination result is true (Yes), the process proceeds to step S6. On the other hand, in the case of false (No), step S5 is repeated.

In step S6, that is, when it is determined to be true (Yes) in the shift position determination in step S5, the control unit 40 generates the cooperative operation request information in the cooperative operation determination unit 41, and the electric parking brake control unit 42 and the electric parking brake control unit 42. It is transmitted to the parking lock control unit 44, and the process proceeds to step S7.

As step S7, the control unit 40 acquires the cooperative operation request information in the electric parking brake control unit 42, controls the operation of the electric parking brake (EPB) 20, and proceeds to step S8. The control unit 40 may proceed to step S8 after confirming the operating state of the electric parking brake 20 by, for example, the electric parking brake operation sensor 22.

As step S8, the control unit 40 acquires the cooperative operation request information in the parking lock control unit 44, activates the parking lock 30 after the electric parking brake 20 is in the operating state, and ends the routine. .. The control unit 40 may terminate the routine after confirming the operating state of the parking lock 30 by, for example, the parking lock operation sensor 31.

As described above, according to the vehicle brake control device 1 according to the present embodiment, when the electric parking brake switch 21 is in the off state and parking is selected in the shift operation unit 19, the electric parking brake 20 is applied. After the operation, the brake cooperation control for operating the parking lock 30 can be performed. This prevents the electric parking brake 20 from being forgotten to operate when the vehicle 10 is parked, prevents an unrecommended operation in which only the parking lock 30 is in the parking state, and excessively deteriorates the durability of the drive train parts. It is not necessary to set to.

Although the description of the embodiment of the vehicle brake control device 1 according to the present invention is completed above, the embodiment of the present invention is not limited to this embodiment.

Further, in the above embodiment, the electric parking brake is a motor-on caliper type, but any parking brake that is electrically operated may be used, and for example, a wire drive type may be used.

1: Vehicle brake control device 10: Vehicle 11: Power generator 12: Transmission 13: Drive shaft 14: Drive wheel 15: Transmission 16: Output shaft 17: Differential mechanism 18: Disc rotor 19: Shift operation unit 20 : Electric parking brake (parking brake)
21: Electric parking brake switch (parking switch)
30: Parking lock 40: Control unit 41: Electric parking brake operation request determination unit 42: Electric parking brake control unit 43: Parking lock control unit

Claims (1)

A shift operation unit that can select the shift position of the vehicle including the parking range,
When the parking range is selected by the shift operation unit, the parking lock that restrains the rotation of the output shaft of the transmission of the vehicle, and
A parking brake that can apply a parking braking force to the wheels of the vehicle,
A parking switch that turns on or off the operation of the parking brake,
When the parking range is selected by the shift operation unit while the parking switch is off, the control unit that activates the parking brake and then activates the parking lock.
Vehicle brake control device.

Images