Brake control system and method and vehicle

Abstract

The invention relates to a brake control system and method and a vehicle. The brake control system comprises a pedal simulator assembly; the pedal travel sensor is used for collecting pedal travel information of the pedal simulator assembly; the VCU system comprises a four-wheel drive assembly and a VCU controller used for controlling the four-wheel drive assembly to generate braking force, and the VCU controller is connected with the four-wheel drive assembly; the EMB system comprises an EMB assembly and an EMB controller used for controlling the EMB assembly to generate braking force, and the EMB controller is connected with the EMB assembly; the VCU controller and the EMB controller are respectively connected with the pedal travel sensor and are used for acquiring pedal travel information; the EMB controller is connected with the VCU controller, and the VCU controller is used for providing braking force through the VCU system when it is detected that the braking function of the EMB system breaks down. By means of the brake control system, the brake modes of the vehicle are enriched, the brake effect is improved, the manufacturing cost is saved, functional safety can be better met, and the robustness of the system is enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobiles, in particular to a brake control system and method, and a vehicle. BACKGROUND

[0002] The currently used brake-by-wire system for automobiles is an electronic hydraulic brake (EHB) system, which can actively increase pressure and disengage the pedal compared with the traditional hydraulic brake system, but the response speed is slower compared with the electronic mechanical brake (EMB) system. Because the structures of the EMB system and the EHB system are different, when a serious fault occurs in the EHB controller, the mechanical backup can be entered to ensure a certain braking performance. When a serious fault occurs in the EMB controller, only the entire EMB system with redundant backup can be used to ensure the braking performance by the redundant EMB controller according to the brake-by-wire system. These redundant methods can meet the functional safety requirements, but greatly increase the manufacturing cost of the automobile, in addition, the braking mechanism is single, and the hazards caused by some possible common cause failures cannot be effectively covered.

[0003] Therefore, it is necessary to develop a new brake control system and method, and a vehicle. SUMMARY

[0004] The purpose of the present application is to provide a brake control system and method, and a vehicle, which can not only enrich the braking mode of the vehicle, but also improve the braking effect.

[0005] In a first aspect, the brake control system comprises: a pedal simulator assembly; a pedal stroke sensor for collecting pedal stroke information of the pedal simulator assembly; a VCU system comprising a four-wheel drive assembly and a VCU controller for controlling the four-wheel drive assembly to generate braking force, the VCU controller being connected to the four-wheel drive assembly; an EMB system comprising an EMB assembly and an EMB controller for controlling the EMB assembly to generate braking force, the EMB controller being connected to the EMB assembly; the VCU controller and the EMB controller are connected to the pedal stroke sensor for obtaining pedal stroke information, and the EMB controller and the VCU controller are connected, and the VCU controller is used to provide braking force through the VCU system when a brake function fault of the EMB system occurs.

[0006] Optionally, the pedal stroke sensor comprises a first pedal stroke sensor and a second pedal stroke sensor, the first pedal stroke sensor is connected to the VCU controller and the EMB controller respectively, and the second pedal stroke sensor is connected to the VCU controller and the EMB controller respectively.

[0007] Optionally, the VCU power supply is further included, and the VCU controller and the four-wheel drive assembly are connected to the VCU power supply respectively.

[0008] Optionally, the VCU power supply comprises a main VCU power supply and a redundant VCU power supply for replacing the main VCU power supply, the VCU controller is connected to the main VCU power supply, and the VCU controller is connected to the redundant VCU power supply through a DC / DC converter, wherein the redundant VCU power supply is a power supply of the four-wheel drive assembly.

[0009] Optionally, the EMB power supply is further included, and the EMB controller and the EMB assembly are connected to the EMB power supply respectively.

[0010] Optionally, the EMB power supply comprises a main EMB power supply and a redundant EMB power supply for replacing the main EMB power supply, the EMB controller and the EMB assembly are connected to the main EMB power supply respectively, and the EMB controller and the EMB assembly are connected to the redundant EMB power supply respectively.

[0011] Optionally, a pedal simulator assembly power supply module is further included, and the pedal simulator assembly is connected to the pedal simulator assembly power supply module.

[0012] Optionally, the pedal simulator assembly power supply module comprises a main pedal power supply and a redundant pedal power supply for replacing the main pedal power supply, and the main pedal power supply and the redundant pedal power supply are connected to the pedal simulator assembly respectively.

[0013] In a second aspect, a control method of the brake control system is provided, which is used for controlling the brake control system, and the steps comprise: S1, the pedal stroke sensor collects pedal stroke information of the pedal simulator assembly in real time and transmits the pedal stroke information to the EMB controller and the VCU controller; S2, the EMB controller and / or the VCU controller judge whether the driver has a braking intention according to the pedal stroke information, if yes, turn to S3; otherwise, turn to S1; S3, the VCU controller determines whether the braking function of the EMB system fails according to the transmission data of the EMB controller, if yes, the VCU controller controls the four-wheel drive assembly to generate corresponding braking force according to the pedal stroke information, and turns to step S1; otherwise, the EMB controller controls the EMB assembly to generate corresponding braking force according to the pedal stroke information, and turns to step S1.

[0014] In a third aspect, the application provides a vehicle comprising the brake control system.

[0015] The application has the following advantages: The brake control system and method and the vehicle of the application can realize the integration of braking / driving by controlling the four-wheel drive output reverse torque through the VCU, and realize the redundancy of braking by cooperating with the EMB braking system, thereby meeting the functional safety requirements. Since the vehicle itself has a VCU, it is not necessary to double backup all components of the EMB system, and the functional safety requirements can be met, thereby saving the manufacturing cost. The action mechanisms of the two braking modes are different, which not only enriches the braking mode of the electric vehicle and improves the braking effect, but also better meets the functional safety and strengthens the robustness of the system, thereby avoiding the harm caused by some common cause failures. On the other hand, the vehicle body stability control function such as TCS is introduced into the VCU controller, thereby enhancing the stability of the vehicle during system control. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 FIG. 1 is a schematic diagram of the brake control system according to an embodiment of the application; Fig. 2 FIG. 2 is a schematic diagram of the brake control system according to another embodiment of the application; Fig. 3 FIG. 3 is a flowchart of the brake control method according to an embodiment of the application.

[0017] BRIEF DESCRIPTION OF DRAWINGS DETAILED DESCRIPTION

[0018] Other advantages and benefits of the present application will become apparent to those skilled in the art upon consideration of the disclosure herein. The present application can be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. Rather, this description is provided as illustrative of the present application so that others skilled in the art can both understand and appreciate the present application and utilize it to its fullest extent.

[0019] Referring to Figs. 1-3 As shown in the drawings, the embodiment of the present application discloses a brake control system, which comprises a pedal simulator assembly 1, a pedal stroke sensor 2, a VCU system 3 and an EMB system 4. The pedal stroke sensor 2 is used to collect the pedal stroke information of the pedal simulator assembly 1. The VCU system 3 comprises a four-wheel drive assembly 31 and a VCU controller 32 used to control the four-wheel drive assembly 31 to generate braking force, and the VCU controller 32 is connected with the four-wheel drive assembly 31. The EMB system 4 comprises an EMB assembly 41 and an EMB controller 42 used to control the EMB assembly 41 to generate braking force, and the EMB controller 42 is connected with the EMB assembly 41. The VCU controller 32 and the EMB controller 42 are respectively connected with the pedal stroke sensor 2 to obtain the pedal stroke information, and the EMB controller 42 and the VCU controller 32 are connected, and the VCU controller 32 is used to provide braking force through the VCU system 3 when the braking function of the EMB system 4 fails. Wherein, the braking function of the EMB system 4 fails can be the failure of the EMB assembly 41 and / or the EMB controller 42.

[0020] In normal operation, the braking is mainly completed by the EMB system 4, when the EMB system 4 fails, the VCU controller 32 can detect in time through the information interaction between the EMB controller 42 and the VCU controller 32, and at the same time, the required braking force is provided through the control of the four-wheel drive assembly 31, and at the same time, the vehicle body stability system in the VCU controller 32 can ensure the stability of the automobile in the braking process. The EMB controller 42 and the VCU controller 32 are connected through the EMB signal bus and the VCU signal bus.

[0021] In the embodiment, the pedal stroke sensor 2 includes a first pedal stroke sensor 21 and a second pedal stroke sensor 22, the first pedal stroke sensor 21 is connected with the VCU controller 32 and the EMB controller 42 respectively, and the second pedal stroke sensor 22 is connected with the VCU controller 32 and the EMB controller 42 respectively. The first pedal stroke sensor 21 transmits the collected pedal stroke information to the VCU controller 32 and the EMB controller 42, and the second pedal stroke sensor 22 transmits the collected pedal stroke information to the VCU controller 32 and the EMB controller 42. The first pedal stroke sensor 21 and the second pedal stroke sensor 22 realize redundancy and improve safety.

[0022] In the embodiment, the brake control system further includes a VCU power supply, the VCU controller 32 and the four-wheel drive assembly 31 are connected with the VCU power supply respectively. The VCU power supply is used to provide power supply for the VCU controller 32 and the four-wheel drive assembly 31.

[0023] In the embodiment, the VCU power supply includes a main VCU power supply 5 and a redundant VCU power supply 6 used to replace the main VCU power supply, the VCU controller 32 is connected with the main VCU power supply 5, and the VCU controller 32 is connected with the redundant VCU power supply 6 through a DC / DC converter, wherein the redundant VCU power supply 6 is a power supply of the four-wheel drive assembly 31. The main VCU power supply 5 is a low-voltage power supply, wherein the VCU controller 32 is connected with the redundant VCU power supply 6 through a DC / DC converter. The VCU controller 32 is redundantly powered through the low-voltage power supply and the high-voltage power supply after conversion by the DC / DC converter, and when the low-voltage power supply fails, the high-voltage power supply is used to supply power after conversion by the DC / DC converter, so that the VCU controller 32 will not lose all functions. The redundant VCU power supply 6 is a power supply of the four-wheel drive assembly 31, which means that the existing power supply of the four-wheel drive assembly 31 is used as the redundant power supply of the VCU controller 32, without additional cost.

[0024] In the embodiment, the brake control system further includes an EMB power supply, the EMB controller 42 and the EMB assembly 41 are connected with the EMB power supply respectively. The EMB power supply is used to provide power supply for the EMB controller and the EMB assembly 41.

[0025] In the embodiment, the EMB power supply includes a main EMB power supply 7 and a redundant EMB power supply 8 used to replace the main EMB power supply 7, the EMB controller 42 and the EMB assembly 41 are connected with the main EMB power supply 7 respectively, and the EMB controller 42 and the EMB assembly 41 are connected with the redundant EMB power supply 8 respectively. The EMB power supply, the main EMB power supply 7 and the redundant EMB power supply 8 are all low-voltage power supplies.

[0026] In the embodiment, the brake control system further comprises a pedal simulator assembly power supply module, and the pedal simulator assembly 1 is connected with the pedal simulator assembly power supply module.

[0027] In the embodiment, the pedal simulator assembly power supply module comprises a main pedal power supply 9 and a redundant pedal power supply 10 used for replacing the main pedal power supply 9, and the main pedal power supply 9 and the redundant pedal power supply 10 are respectively connected with the pedal simulator assembly 1. The two redundant power supplies can meet the functional safety requirement, wherein the pedal simulator assembly power supply module, the main pedal power supply 9 and the redundant pedal power supply 10 are all low-voltage power supplies.

[0028] Referring to Figs. 1-3 The embodiment of the application further discloses a control method of the brake control system, which is used for controlling the brake control system, and steps of the method comprise: S1, the pedal stroke sensor 2 collects pedal stroke information of the pedal simulator assembly 1 in real time and transmits the pedal stroke information to the EMB controller 42 and the VCU controller 32.

[0029] S2, the EMB controller 42 and / or the VCU controller 32 judge whether the driver has a braking intention according to the pedal stroke information, if yes, turn to execute S3; otherwise, turn to execute S1.

[0030] S3, the VCU controller 32 judges whether the braking function of the EMB system 4 fails according to the transmission data of the EMB controller 42, if yes, the VCU controller 32 controls the four-wheel drive assembly 31 to generate corresponding braking force according to the pedal stroke information, and turns to execute step S1; otherwise, the EMB controller 42 controls the EMB assembly 41 to generate corresponding braking force according to the pedal stroke information, and turns to execute step S1. Wherein, the braking function of the EMB system 4 failing can be the EMB assembly 41 and / or the EMB controller 42 failing.

[0031] By judging the braking intention of the driver and taking reasonable braking measures: When the braking function of the EMB system 4 is not faulty, the EMB controller 42 controls the EMB assembly 41 to generate corresponding braking force according to the pedal stroke information.

[0032] When the braking function of the EMB system 4 fails, the VCU controller 32 discovers and controls the four-wheel drive assembly 31 to generate corresponding braking force in time through interaction information, so as to realize redundancy of the braking system.

[0033] In addition, when the VCU system 3 generates braking, a vehicle body stability control function is introduced to ensure the stability of the automobile in the braking process.

[0034] The EMB controller 42 and the VCU controller 32 respectively use respective signal transmission buses to deliver control information, control the EMB assembly 41 and the four-wheel drive assembly 31 respectively, and realize different braking modes. The EMB controller 42 and the VCU controller 32 use a signal bus to interact with necessary information, judge the state of the vehicle braking system, make a decision on the braking strategy, and realize the braking of the vehicle. There is a monitoring mechanism between the EMB controller 42 and the VCU controller 32. When the EMB system 4 cannot normally realize the function due to some failures, the VCU controller 32 can detect in time and enter a safe state in time, and provide braking force through the control of the four-wheel drive assembly 31.

[0035] In the embodiment, the VCU system 3 and the EMB system 4 can both provide braking force, and the ways of providing braking force are completely different. The VCU system 3 provides braking force by controlling the four-wheel drive assembly 31 and using the output reverse torque of the motor. The EMB system 4 provides braking force by controlling the EMB assembly 41. Compared with the existing redundant single braking mode, the two different ways of providing braking force can better meet the functional safety requirements. In addition, the four-wheel drive assembly 31 is high-voltage power supply, the EMB system 4 is low-voltage power supply, and the control of the two parts belongs to different controllers, which ensures the independence of the two parts to a certain extent.

[0036] In the embodiment, the pedal stroke sensor 2 collects the pedal stroke information of the pedal simulator assembly 1 in real time, including the following steps: The pedal stroke sensor 2 includes a first pedal stroke sensor 21 and a second pedal stroke sensor 22. The first pedal stroke sensor 21 transmits the collected pedal stroke information to the VCU controller 32 and the EMB controller 42. The second pedal stroke sensor 22 transmits the collected pedal stroke information to the VCU controller 32 and the EMB controller 42.

[0037] The embodiment also discloses a vehicle comprising the above braking control system.

[0038] Through the braking control system, method, and vehicle of the present application, the VCU controls the four-wheel drive assembly 31 to output reverse torque to achieve integrated braking / driving, while cooperating with the EMB braking system to achieve braking redundancy and meet functional safety requirements. Because the vehicle itself has a VCU controller 32, there is no need to double-back up all components of the EMB system, and functional safety requirements can still be met, saving manufacturing costs. The two braking methods have different working mechanisms. This approach not only enriches the braking methods of electric vehicles and improves the braking effect, but also better meets functional safety, strengthens the robustness of the system, and avoids hazards caused by certain common cause failures. On the other hand, the VCU controller 32 introduces body stability control functions, such as TCS, to enhance vehicle stability during system control.

[0039] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A braking control system, characterized in that: include: Pedal simulator assembly (1); A pedal stroke sensor (2) for collecting pedal stroke information of the pedal simulator assembly (1); A VCU system (3) includes a four-wheel drive assembly (31) and a VCU controller (32) for controlling the four-wheel drive assembly (31) to generate braking force, wherein the VCU controller (32) is connected to the four-wheel drive assembly (31); An EMB system (4) includes an EMB assembly (41) and an EMB controller (42) for controlling the EMB assembly (41) to generate a braking force, wherein the EMB controller (42) is connected to the EMB assembly (41); The VCU controller (32) and the EMB controller (42) are respectively connected to the pedal stroke sensor (2) for obtaining pedal stroke information; The EMB controller (42) is connected to the VCU controller (32), and the VCU controller (32) is used to provide braking force through the VCU system (3) when a failure occurs in the braking function of the EMB system (4).

2. The brake control system according to claim 1, characterized in that: The pedal stroke sensor (2) comprises a first pedal stroke sensor (21) and a second pedal stroke sensor (22), wherein the first pedal stroke sensor (21) is connected to the VCU controller (32) and the EMB controller (42), respectively, and the second pedal stroke sensor (22) is connected to the VCU controller (32) and the EMB controller (42), respectively.

3. The brake control system according to claim 1, characterized in that: It also includes a VCU power supply, and the VCU controller (32) and the four-wheel drive assembly (31) are respectively connected to the VCU power supply.

4. The brake control system according to claim 3, characterized in that: The VCU power supply includes a main VCU power supply (5) and a redundant VCU power supply (6) for replacing the main VCU power supply (5), the VCU controller (32) is connected to the main VCU power supply (5), and the VCU controller (32) is connected to the redundant VCU power supply (6) through a DC / DC converter, wherein the redundant VCU power supply (6) is the power supply of the four-wheel drive assembly (31).

5. The brake control system according to claim 1, characterized in that: It also includes an EMB power supply, and the EMB controller (42) and the EMB assembly (41) are respectively connected to the EMB power supply.

6. The brake control system according to claim 5, characterized in that: The EMB power supply includes a main EMB power supply (7) and a redundant EMB power supply (8) for replacing the main EMB power supply (7). The EMB controller (42) and the EMB assembly (41) are respectively connected to the main EMB power supply (7). The EMB controller (42) and the EMB assembly (41) are also respectively connected to the redundant EMB power supply (8).

7. The brake control system according to claim 1, characterized in that: It also includes a pedal simulation assembly power supply module, and the pedal simulator assembly (1) is connected to the pedal simulation assembly power supply module.

8. The brake control system according to claim 7, characterized in that: The pedal simulation assembly power supply module comprises a main pedal power supply (9) and a redundant pedal power supply (10) for replacing the main pedal power supply (9), and the main pedal power supply (9) and the redundant pedal power supply (10) are respectively connected to the pedal simulator assembly (1).

9. A control method for a braking control system, characterized in that: Using the braking control system according to any one of claims 1 to 8, the method includes: S1, a pedal stroke sensor (2) collects pedal stroke information of the pedal simulator assembly (1) in real time and transmits it to the EMB controller (42) and the VCU controller (32); S2, the EMB controller (42) and / or the VCU controller (32) determines whether the driver has a braking intention based on the pedal stroke information, and if so, proceeds to execution S3; otherwise, proceeds to execution S1; S3, the VCU controller (32) determines whether the braking function of the EMB system (4) fails based on the transmission data of the EMB controller (42). If so, the VCU controller (32) controls the four-wheel drive assembly (31) to generate a corresponding braking force based on the pedal stroke information, and proceeds to step S1; otherwise, the EMB controller (42) controls the EMB assembly (41) to generate a corresponding braking force based on the pedal stroke information, and proceeds to step S1.

10. A vehicle, characterized in that: Comprising a brake control system according to any one of claims 1 to 8.

Images