WO2022133744A1

WO2022133744A1 - Parking brake system of automobile, automobile and control method therefor

Info

Publication number: WO2022133744A1
Application number: PCT/CN2020/138393
Authority: WO
Inventors: 柴本本; 刘峰宇; 张永生
Original assignee: 华为技术有限公司
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2022-06-30
Also published as: CN112739593B; CN112739593A

Abstract

Provided are a parking brake system of an automobile, an automobile and a control method therefor. By performing redundant backup on a motor driving unit, power can be provided for a motor execution mechanism by means of a motor redundancy unit when the motor driving unit fails, so as to improve the reliability and safety of EPB. The provided parking brake system comprises: a motor execution mechanism (105) for providing a brake force for wheels; a motor driving unit (103) connected to the motor execution mechanism (105) and used for providing power for the motor execution mechanism (105); and a motor redundancy unit (104) connected to the motor execution mechanism (105) and used for providing power for the motor execution mechanism (105) when the motor driving unit (103) fails.

Description

Parking brake system of automobile, automobile and control method thereof

technical field

The present application relates to the field of automobiles, and more particularly, to a parking brake system of an automobile, an automobile and a control method thereof.

Background technique

The braking system of a car is a system that applies a certain braking force to the wheels of the car, thereby performing a certain degree of forced braking. The function of the braking system is to force the moving car to decelerate or even stop according to the requirements of the driver or the controller, or to make the parked car stably park under various road conditions (for example, on a slope), or to make the vehicle stop. The speed of the car driving downhill remains stable. Compared with the traditional mechanical handbrake, the electronic parking brake (Electronic Parking Brake, EPB) system can control the DC motor of the parking brake device mounted on the wheel side through the built-in electronic control unit (electronic control unit, ECU). , to realize the clamping and release of the wheels, and at the same time, it can provide suitable braking force for the vehicle according to different road conditions, and realize the electronic parking of the vehicle. On the vehicle equipped with the EPB system, the driver can realize the car braking through a simple switch operation (electronic handbrake button), and the braking effect will not be changed by the driver's strength. The system brakes the moving car and provides a certain amount of braking force in an emergency to avoid accidents.

However, due to the complex driving conditions of the vehicle, when the EPB system fails or breaks down, the EPB system cannot apply the parking brake force, or cannot release the parking brake, which affects the safety of parking. At the same time, there is still a P-gear mechanism inside the gearbox, which greatly increases the cost of the mechanical system for parking and is not conducive to the integrated control of the vehicle. Therefore, how to improve the reliability and security of the EPB system is an urgent problem to be solved.

SUMMARY OF THE INVENTION

The present application provides a parking brake system of an automobile, an automobile and a control method thereof, so as to improve the reliability and safety of the EPB system.

In a first aspect, a parking brake system for an automobile is provided, the parking brake system includes a motor actuator (105) for providing braking force to wheels; a motor drive unit (103), and the motor actuator (105) is connected to provide power for the motor actuator (105); a motor redundant unit (104) is connected to the motor actuator (105) for when the motor drive unit (103) fails The motor actuator (105) is powered.

In the embodiment of the present application, the motor drive unit in the parking brake system has a redundant backup structure. When the motor drive unit fails, the motor drive unit can be used to provide power for the motor actuator, so that the occurrence of the motor drive unit can be avoided. The inability to park or unpark the car at the time of failure, while avoiding the risk of towing caused by it, can improve the reliability and safety of the EPB.

In conjunction with the first aspect, in some implementations of the first aspect, the motor redundancy unit (104) includes a relay.

In combination with the first aspect, in some implementations of the first aspect, the motor redundancy unit (104) includes a unit with the same structure as the motor drive unit (103).

With reference to the first aspect, in some implementations of the first aspect, the braking system further includes: a first parking control unit (102) connected to the motor redundancy unit (104) for driving the motor when the motor drives The motor redundancy unit (104) is controlled when the unit (103) fails.

In combination with the first aspect, in some implementations of the first aspect, the braking system further includes: a second parking control unit (106), connected to the motor redundancy unit (104), and configured to operate in the first The motor redundancy unit (104) is controlled when the parking control unit (102) fails.

With reference to the first aspect, in some implementations of the first aspect, the braking system further includes: a second parking control unit (106), connected to the motor drive unit (103), and configured to be used in the first parking control unit (103). The motor drive unit (103) is controlled when the vehicle control unit (102) fails.

In combination with the first aspect, in some implementations of the first aspect, the first parking control unit (102) is used to control a motor drive unit or a motor redundancy unit on one side, and the second parking control unit (106) ) is used to control the motor drive unit or motor redundancy unit on the other side.

With reference to the first aspect, in some implementations of the first aspect, the braking system further includes: a power supply (101) connected to the motor redundancy unit (104) for use in the first parking control unit ( 102) supply power to the motor redundant unit (104) in case of failure.

With reference to the first aspect, in some implementations of the first aspect, the braking system further includes: a power supply (101), connected to the motor drive unit (103), and used for the first parking control unit (102) ) to supply power to the motor drive unit (103) when it fails.

With reference to the first aspect, in some implementations of the first aspect, the braking system further includes: a switch button (107) connected to the motor redundancy unit (104) for controlling the motor redundancy unit (104) ).

In the embodiment of the present application, the parking brake system adopts a distributed redundant EPB control unit with three layers of failure backup. In the case of complete failure of the motor drive unit, the first parking control unit and the second parking control unit , can still provide power to the motor actuator through the motor redundant unit, so as to avoid the inability to park or release the parking when the motor drive unit fails, avoid the risk of towing, and improve the reliability and safety of the EPB . At the same time, the parking brake system provided by the embodiment of the present application cancels the P-gear locking mechanism of the gearbox, which can reduce the mechanical complexity of the vehicle body; the motor control units of the EPB are respectively arranged in two controllers, which can reduce the speed of the controller. Therefore, the reliability and safety of the EPB can be improved.

In a second aspect, a method for controlling a parking brake system of an automobile is provided, including: a motor drive unit (103) provides power for a motor actuator (105); when the motor drive unit (103) fails, the motor redundant The redundant unit (104) provides power for the motor actuator (105).

With reference to the second aspect, in some implementations of the second aspect, the control method further includes: controlling the motor redundancy unit (104) through the first parking control unit (102) or the second parking control unit (106) ), the first parking brake unit or the second parking control unit (106) is connected to the motor redundancy unit (104).

In conjunction with the second aspect, in some implementations of the second aspect, the motor redundancy unit (104) is controlled by the first parking control unit (102) or the second parking control unit (106), including: when When the first parking control unit (102) fails, the second parking control unit (106) controls the motor redundancy unit (104).

In conjunction with the second aspect, in some implementations of the second aspect, the motor redundancy unit (104) is controlled by the first parking control unit (102) or the second parking control unit (106), including: when When the second parking control unit (106) fails, the first parking control unit (102) controls the motor redundancy unit (104).

With reference to the second aspect, in some implementations of the second aspect, the control method further includes: controlling the motor redundancy unit (104) through a switch button, where the switch button is connected to the motor redundancy unit (104).

In conjunction with the second aspect, in some implementations of the second aspect, the motor redundancy unit (104) provides power for the motor actuator (105), including: the motor redundancy unit (104) controls the motor actuator (105) Clamp the parking caliper.

In conjunction with the second aspect, in some implementations of the second aspect, the motor redundancy unit (104) provides power for the motor actuator (105), including: the motor redundancy unit (104) controls the motor actuator (105) Release the parking caliper.

In the embodiment of the present application, the parking brake system can determine whether the parking brake is faulty through the self-checking system of the vehicle, so as to adopt different braking solutions according to different fault scenarios. Therefore, in the distribution with three-layer failure backup In the redundant EPB control unit, in the case of complete failure of the motor drive unit, the first parking control unit and the second parking control unit, the motor redundant unit can still provide power for the motor actuator, which can effectively avoid the motor The inability to park or unpark when the drive unit fails, avoids the risk of towing, which can improve the reliability and safety of the EPB.

Description of drawings

FIG. 1 is a schematic diagram of a parking brake system of an automobile according to an embodiment of the present application.

FIG. 2 is a schematic diagram of a relay control circuit of the motor redundancy unit 104 in the embodiment of the present application.

FIG. 3 is a schematic diagram of a control circuit of the motor driving unit 103 in the embodiment of the present application.

FIG. 4 is a schematic diagram of another parking brake system of an automobile according to an embodiment of the present application.

FIG. 5 is a schematic diagram of the architecture of a parking brake system of an automobile according to an embodiment of the present application.

FIG. 6 is a schematic diagram of an arrangement scheme of a parking brake system of an automobile according to an embodiment of the present application.

FIG. 7 is a schematic diagram of signal connection of a parking brake system of an automobile according to an embodiment of the present application.

FIG. 8 is another arrangement scheme of a parking brake system of an automobile according to an embodiment of the present application.

FIG. 9 is a schematic diagram of signal connection of another parking brake system of an automobile according to an embodiment of the present application.

FIG. 10 is another arrangement scheme of a parking brake system of an automobile according to an embodiment of the present application.

FIG. 11 is a schematic diagram of signal connection of another parking brake system of an automobile according to an embodiment of the application.

FIG. 12 is a schematic flowchart of a control method of a parking brake system provided by an embodiment of the present application.

Detailed ways

The technical solutions in the present application will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a parking brake system of an automobile according to an embodiment of the present application. The parking brake system 100 shown in FIG. 1 includes a motor drive unit 103 , a motor redundancy unit 104 , and a motor actuator 105 . Among them, the motor actuator 105 is used to provide braking force for the wheels; the motor drive unit 103 is connected to the motor actuator 105 to provide power for the motor actuator 105; the motor redundancy unit 104 is connected to the motor actuator 105, Used to power the motor actuator 105 when the motor drive unit 103 fails.

Under normal circumstances, the parking brake system uses the motor drive unit 103 to control the motor actuator 105, and then the motor actuator 105 can apply braking force to the wheels to achieve the purpose of parking.

When the motor drive unit 103 fails, the motor redundancy unit 104 can replace the motor drive unit 103 to control the motor actuator 105, and can also make the motor actuator 105 apply braking force to the wheels to achieve the purpose of parking.

The motor redundancy unit 104 may include relays, as shown in FIG. 2 .

FIG. 2 is a schematic diagram of a relay control circuit of the motor redundancy unit 104 in the embodiment of the present application. The relay includes a power supply module 201 and a DC motor 202 . The power supply module 201 supplies power to the DC motor 202, and controls the forward and reverse rotation of the DC motor 202 through the different connection states of the four ports NO1, NO2, NC1, and NC2, thereby realizing the clamping, releasing and power-off state control of the motor actuator 105. Power maintenance and other functions. The specific control logic is shown in Table 1.

Table 1 Control logic of relay circuit

NO1NO1	NO2NO2	NC1NC1	NC2NC2	功能Function
连通Connected			连通Connected	夹紧clamp
	连通Connected	连通Connected		释放freed
		连通Connected	连通Connected	断电制动Power off brake

Optionally, the motor redundancy unit 104 may include a unit with the same structure as the motor driving unit 103 , as shown in FIG. 3 .

FIG. 3 is a schematic diagram of a control circuit of the motor driving unit 103 in the embodiment of the present application. The control circuit adopts the traditional H-bridge circuit, and realizes the functions of clamping, releasing and maintaining the braking force in the power-off state of the motor actuator 105 through the on-off coordination of the switches of the upper and lower bridge arms. An anti-reverse power device is provided at the entrance of the H-bridge arm. The power supply module 301 supplies power to the motor drive unit 103. The upper and lower tubes U1, U2, L1, and L2 of the H-bridge operate jointly to control the forward rotation of the DC motor 302 through different connection states. And reverse, and then realize the function of clamping and releasing the motor actuator 105, the specific control logic is shown in Table 2.

Table 2 Control logic of motor drive unit control circuit

U1U1	U2U2	L1L1	L2L2	功能Function
连通Connected			连通Connected	夹紧clamp
	连通Connected	连通Connected		释放freed
		连通Connected	连通Connected	断电制动Power off brake

In the parking brake system provided by the embodiment of the present application, the motor drive unit is redundantly backed up, and when the motor drive unit fails, the motor redundant unit can be used to provide power for the motor actuator, so that the failure of the motor drive unit can be avoided. It can improve the reliability and safety of the EPB by preventing the situation that the car cannot be parked or released at the same time, and at the same time avoid the risk of towing caused by it.

FIG. 4 is a schematic diagram of another parking brake system of an automobile according to an embodiment of the present application. The parking brake system 200 shown in FIG. 4 includes a power supply 101 , a first parking control unit 102 , a motor drive unit 103 , a motor redundancy unit 104 , a motor actuator 105 , a second parking control unit 106 and a switch button 107 . The connection relationship and function of the motor drive unit 103 , the motor redundancy unit 104 and the motor actuator 105 are the same as those in the parking brake system 100 shown in FIG. 1 . In addition, the first parking control unit 102 is connected to the motor redundant unit 104 for controlling the motor redundant unit 104 when the motor driving unit 103 fails. The second parking control unit 106 is connected to the motor redundancy unit 104 for controlling the motor redundancy unit 104 when the first parking control unit 102 fails; the second parking control unit 106 may also be in phase with the motor driving unit 103 Connection for controlling the motor drive unit 103 when the first parking control unit 102 fails. The power supply 101 is connected to the motor redundant unit 104 for supplying power to the motor redundant unit 104 when the first parking control unit 102 fails; the power supply 101 can also be connected to the motor driving unit 103 for supplying the motor driving unit 103 powered by. The switch button 107 is directly connected to the motor redundancy unit 104, and is used to directly control the motor redundancy unit 104 through the switch button 107 to provide power to the motor actuator 105 in an emergency.

Under normal circumstances, the first parking control unit 102 controls the motor drive unit 103, and the motor drive unit 103 controls the motor actuator 105, and the motor actuator 105 can apply braking force to the wheels to achieve the purpose of parking. Wherein, the power supply 101 may supply power to the motor driving unit 103 through the first parking control unit 102 , or may separately supply power to the motor driving unit 103 .

When the motor drive unit 103 fails, the first parking control unit 102 can control the motor redundant unit 104, and the motor redundant unit 104 can replace the motor drive unit 103 to control the motor actuator 105, and can also make the motor actuator 105 Apply braking force to the wheels to achieve the purpose of parking. Wherein, the power supply 101 may supply power to the redundant motor unit 104 through the first parking control unit 102 , or may separately supply power to the redundant motor unit 104 .

Optionally, when the motor drive unit 103 fails, the second parking control unit 106 can control the motor redundancy unit 104, so that the motor redundancy unit 104 can replace the motor drive unit 103 to control the motor actuator 105, and can also control the motor actuator 105. The motor actuator 105 is used to apply braking force to the wheels to achieve the purpose of parking. The power supply 101 may supply power to the redundant motor unit 104 through the first parking control unit 102 or the second parking control unit 106 , or may separately supply power to the redundant motor unit 104 .

When the first parking control unit 102 fails, the second parking control unit 106 can control the motor redundancy unit 104, so that the motor redundancy unit 104 can control the motor actuator 105, so that the motor actuator 105 applies braking force to achieve the purpose of parking. The power supply 101 may be directly connected to the redundant motor unit 104 to supply power to the redundant motor unit 104 .

Optionally, when the first parking control unit 102 fails but the motor driving unit 103 does not fail, the second parking control unit 106 can also control the motor driving unit 103, so that the motor driving unit 103 can control the motor actuator 105. It is controlled so that the motor actuator 105 applies braking force to the wheels to achieve the purpose of parking. Wherein, the power supply 101 can be directly connected to the motor driving unit 103 to supply power.

When the first parking control unit 102 and the motor driving unit 103 fail at the same time, the second parking control unit 106 can control the motor redundancy unit 104, so that the motor redundancy unit 104 can control the motor actuator 105, so that the motor The actuator 105 applies braking force to the wheels to achieve the purpose of parking. The power supply 101 may be directly connected to the redundant motor unit 104 to supply power to the redundant motor unit 104 .

When the first parking control unit 102 and the second parking control unit 106 fail at the same time, regardless of whether the motor drive unit 103 fails, the motor redundancy unit 104 can be controlled directly by pressing the switch button 107 so that the Motor redundancy unit 104 powers motor actuator 105 .

When the motor drive unit 103 and the second parking control unit 106 fail at the same time, the first parking control unit 102 can control the motor redundancy unit 104, so that the motor redundancy unit 104 can control the motor actuator 105, so that the motor The actuator 105 applies braking force to the wheels to achieve the purpose of parking. The power supply 101 may be directly connected to the redundant motor unit 104 to supply power to the redundant motor unit 104 .

In addition, when the motor redundancy unit 104 fails, if other units do not fail, the motor drive unit 103 can be normally controlled by the first parking control unit 102, so that the motor drive unit 103 can control the motor actuator 105, The motor actuator 105 is used to apply braking force to the wheels to achieve the purpose of parking. If the motor drive unit 103 also fails at the same time, the first parking control unit 102 sends a braking request to the hydraulic braking system, and the hydraulic braking system is used for braking.

It should be understood that the failure of the first parking control unit 102 may only be due to the damage of the control chip, and the internal circuit can still be turned on. At this time, the power supply 101 can reuse the existing circuit to supply power to other normal units. If the failure of the first parking control unit 102 will cause the line to be disconnected, separate wiring can be provided between the power supply 101 and other units to supply power to the other units.

The first parking control unit 102 is used to control the motor drive unit 103 or the motor redundant unit 104 on one side, and the second parking control unit 106 may be a backup redundant unit of the first parking control unit 102, or may Duplicate the parking control unit on the other side. It should be understood that the "first" and "second" here are only for distinction, but not limited.

The parking brake system provided by the embodiment of the present application adopts a distributed redundant EPB control unit, and has three layers of failure backup. It is still possible to provide power to the motor actuator through the motor redundant unit, so as to avoid the inability to park or release the parking when the motor drive unit fails, avoid the risk of towing, and improve the reliability and safety of the EPB.

FIG. 5 is a schematic diagram of the architecture of a parking brake system of an automobile according to an embodiment of the present application. The parking brake system 300 shown in FIG. 5 includes a vehicle communication network 310 , an external interface 320 , a left parking brake control system 330 and a right parking brake control system 340 .

The vehicle communication network 310 mainly implements the communication between the left and right parking brake control systems in the form of controller area network (CAN) communication.

The external interface 320 mainly includes the EPB switch button 321 and the gearbox P-gear signal 322, etc. The EPB switch button 321 mainly provides a button triggered by the external EPB, and the EPB motor is controlled by pulling down or releasing the EPB button. The operation request of the EPB can also be achieved through the transmission P range signal 322 .

The left parking brake control system 330 mainly includes a left power supply 331 , a left parking control unit 332 , a left motor drive unit 333 , a left motor redundancy unit 334 , a left motor actuator 335 , and a left parking brake disc 336 . The power supply 331 of the left parking brake system supplies power to the left parking control unit 332 , and supplies power to the left motor drive unit 333 and the left motor redundancy unit 334 at the same time. The left parking control unit 332 judges the state of the entire vehicle according to the EPB switch 321, the P-gear signal 322 and the vehicle state information transmitted by the vehicle communication network 310, and controls the left motor drive unit 333 to clamp the parking or the vehicle. The release operation provides power.

The right parking brake control system 340 mainly includes a right power supply 341 , a right parking control unit 342 , a right motor drive unit 343 , a right motor redundancy unit 344 , a right motor actuator 345 , and a right parking brake disc 346 . The right parking brake control system and the left parking brake control system have the same structure and the same control strategy, and the signal interaction between them is completed through the CAN bus. At the same time, the two are provided with a hard wire connection at the EPB switch button 321 to directly control the left/right motor redundant unit.

The parking brake system architecture shown in FIG. 5 includes an automobile architecture in which the

parking brake system

100 or 200 is applied to a specific EPB system, and the connection relationships and functions of the corresponding units are the same. For example, in the left parking brake control system 330, the left power supply 331 is equivalent to the power supply 101, the left parking control unit 332 is equivalent to the first parking control unit 102, the left motor drive unit 333 is equivalent to the motor drive unit 103, and the left The motor redundancy unit 334 corresponds to the motor redundancy unit 104 , and the left motor actuator 335 corresponds to the motor actuator 105 . Meanwhile, the right parking control unit 342 is equivalent to the second parking control unit 106 , and the EPB switch button is equivalent to the switch button 107 . The same is true for the right parking brake control system 340, which is not repeated here.

The parking brake system provided by the embodiment of the present application adopts the distributed redundant EPB control unit, and has three layers of failure backup. The left motor redundant unit is used to provide power for the left motor actuator, so as to avoid the situation that the left motor drive unit cannot be parked or released when the left motor drive unit fails, thereby avoiding the risk of towing. At the same time, the parking brake system provided by the embodiment of the present application cancels the P-gear locking mechanism of the gearbox, which can reduce the mechanical complexity of the vehicle body; the motor control units of the EPB are respectively arranged in two controllers, which can reduce the speed of the controller. Therefore, the reliability and safety of the EPB can be improved.

The parking brake system provided by the embodiments of the present application can be flexibly arranged in different modules. According to the existing vehicle control unit, the following description is made with reference to FIGS. 6 to 11 .

FIG. 6 is a schematic diagram of an arrangement scheme of a parking brake system of an automobile according to an embodiment of the present application. The left and right parking brakes shown in Fig. 6 are respectively integrated in the left and right body control modules (BCM), and the body domain control unit can meet the requirements of the operation cycle and computing capability of the parking brake control.

FIG. 7 is a schematic diagram of signal connection of a parking brake system of an automobile according to an embodiment of the present application. When the parking control units on the left and right sides are respectively arranged in the body domain control unit, the parking brake system is connected with the signal of the service brake system. The parking brake caliper can be integrated into the rear wheel hydraulic brake caliper of the vehicle, and the signal interaction between the parking brake control unit and the electronic hydraulic brake system (EHB) is carried out through the CAN bus.

FIG. 8 is another arrangement scheme of a parking brake system of an automobile according to an embodiment of the present application. The left and right parking brakes shown in Figure 8 are respectively integrated into the electromechanical servo booster (Ibooster) and the body stability control unit (Electric Stability Control, ESC).

FIG. 9 is a schematic diagram of signal connection of another parking brake system of an automobile according to an embodiment of the present application. The parking control units on the left and right sides are respectively arranged in the Ibooster and the ESC. There are both hydraulic signal interaction and control signal interaction between the Ibooster and ESC.

FIG. 10 is another arrangement scheme of a parking brake system of an automobile according to an embodiment of the present application. The left and right parking brake systems are respectively arranged in an integrated brake system (IBS) and a redundant brake unit (Redundant Brake Unit, RBU).

FIG. 11 is a schematic diagram of signal connection of another parking brake system of an automobile according to an embodiment of the application. The parking control units on the left and right sides are respectively arranged in the IBS and the RBU, and the IBS and the RBU have both hydraulic signal interaction and control signal interaction.

The parking brake system provided by the embodiments of the present application can be flexibly integrated into existing components or systems, and the system functions are integrated while the failure backup of the EPB control unit is performed, which can reduce the complexity of the vehicle system, and at the same time Improve EPB reliability and security.

The braking system and the automobile according to the embodiments of the present application are described above with reference to FIG. 1 to FIG. 11 , and the control method based on the above braking system provided by the embodiments of the present application is described below with reference to FIG. 12 .

1210. The parking brake control system detects an instruction to trigger the parking brake by the EPB switch or the P gear signal.

1220. The system starts to perform state self-check.

1230. Determine whether the parking brake is faulty. If the parking brake is faulty, execute step 1231 or step 1232; if no fault occurs, execute step 1240.

1231. When the parking brake fails and the parking is impossible, the system executes the braking scheme according to the faults of different units. The specific braking scheme has been described in detail in conjunction with FIG. 4 , and will not be repeated here. Table 3 lists several braking schemes when the first parking control unit 102 cannot control the motor drive unit 103 . It is understood that the braking scheme in Table 3 is only an example, not a limitation.

Table 3 Braking schemes when different units fail

1232. When the parking brake fails to release the parking, due to the failure of the control unit of the parking system, you can directly control the on-off of the motor redundancy unit 104 by pressing the switch button 107 for a long time to directly control the on-off of the motor redundancy unit 104 to be a DC motor. 202 or DC motor 302 is applied with a voltage in a certain direction, and then the parking caliper is released to release the parking brake. At the same time, it will prompt the parking system failure, which can avoid the risk of towing.

1240. When the parking brake does not fail, the parking brake system normally performs parking, and the left parking brake system 330 and the right parking brake system 340 respectively control the braking units on the side.

1250. The parking brake system performs braking through the braking scheme in step 1231 or step 1240, and controls the parking caliper of the motor actuator 105 to reach the target clamping force.

1260. The parking braking process ends.

The control method of the parking brake system provided by the embodiment of the present application can determine whether the parking brake is faulty through the self-checking system of the automobile, so as to adopt different braking schemes according to different fault scenarios. In the distributed redundant EPB control unit, in the case of complete failure of the motor drive unit, the first parking control unit and the second parking control unit, the motor redundant unit can still provide power for the motor actuator, which can effectively Avoiding the inability to park or unpark when the motor drive unit fails, avoids the risk of towing, so that the reliability and safety of the EPB can be improved.

The terms "unit", "module", "system" and the like are used in this specification to refer to a computer-related entity, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component may be, but is not limited to, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device may be components. One or more components may reside within a process and/or thread of execution, and a component may be localized on one computer and/or distributed between 2 or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. A component may, for example, be based on a signal having one or more data packets (eg, data from two components interacting with another component between a local system, a distributed system, and/or a network, such as the Internet interacting with other systems via signals) Communicate through local and/or remote processes.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution, and the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, removable hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes .

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

A parking brake system of an automobile, characterized in that, the parking brake system comprises:

a motor actuator (105) for providing braking force to the wheels;

a motor drive unit (103), connected to the motor actuator (105), for providing power to the motor actuator (105);

A motor redundancy unit (104), connected with the motor actuator (105), is used for providing power to the motor actuator (105) when the motor drive unit (103) fails.
The braking system of claim 1, wherein the motor redundancy unit (104) includes a relay.
The braking system according to claim 1 or 2, characterized in that, the motor redundancy unit (104) comprises a unit having the same structure as the motor drive unit (103).
The braking system according to any one of claims 1 to 3, wherein the braking system further comprises:

A first parking control unit (102), connected to the motor redundant unit (104), is used to control the motor redundant unit (104) when the motor drive unit (103) fails.
The braking system of claim 4, wherein the braking system further comprises:

A second parking control unit (106), connected to the motor redundant unit (104), is used to control the motor redundant unit (104) when the first parking control unit (102) fails.
The braking system according to claim 4 or 5, wherein the braking system further comprises:

A second parking control unit (106), connected to the motor driving unit (103), is used to control the motor driving unit (103) when the first parking control unit (102) fails.
The braking system according to claim 5 or 6, wherein the first parking control unit (102) is used to control a motor drive unit or a motor redundancy unit on one side, and the second parking control unit (102) The unit (106) is used to control the motor drive unit or motor redundancy unit on the other side.
The braking system according to any one of claims 4 to 7, wherein the braking system further comprises:

A power supply (101), connected to the motor redundancy unit (104), is used for supplying power to the motor redundancy unit (104) when the first parking control unit (102) fails.
The braking system according to any one of claims 4 to 8, wherein the braking system further comprises:

A power supply (101), connected to the motor driving unit (103), is used for supplying power to the motor driving unit (103) when the first parking control unit (102) fails.
The braking system according to any one of claims 4 to 9, wherein the braking system further comprises:

A switch button (107) is connected to the motor redundant unit (104) for controlling the motor redundant unit (104).
A method for controlling a parking brake system of an automobile, comprising:

The motor drive unit (103) provides power for the motor actuator (105);

When the motor drive unit (103) fails, the motor redundancy unit (104) provides power for the motor actuator (105).
The control method according to claim 11, wherein the control method further comprises:

The motor redundancy unit (104) is controlled by a first parking control unit (102) or a second parking control unit (106), the first parking brake unit or the second parking control unit (106) Connect with the motor redundancy unit (104).
The control method according to claim 12, wherein the controlling the motor redundancy unit (104) through the first parking control unit (102) or the second parking control unit (106) comprises:

When the first parking control unit (102) fails, the second parking control unit (106) controls the motor redundancy unit (104).
The control method according to claim 12, wherein the controlling the motor redundancy unit (104) through the first parking control unit (102) or the second parking control unit (106) comprises:

When the second parking control unit (106) fails, the first parking control unit (102) controls the motor redundancy unit (104).
The control method according to any one of claims 11 to 14, wherein the control method further comprises:

The motor redundant unit (104) is controlled by a switch button, and the switch button is connected with the motor redundant unit (104).
The control method according to any one of claims 11 to 15, wherein the motor redundancy unit (104) provides power for the motor actuator (105), comprising:

The motor redundancy unit (104) controls the motor actuator (105) to clamp the parking caliper.
The control method according to any one of claims 11 to 15, wherein the motor redundancy unit (104) provides power for the motor actuator (105), comprising:

The motor redundancy unit (104) controls the motor actuator (105) to release the parking caliper.