Braking system and method for identifying dual assistance of a brake booster and an auxiliary brake booster

Abstract

The present application relates to a braking system having an auxiliary braking force booster, which is constructed to serve as an auxiliary mechanism for the braking force booster, and is characterized in that the braking system includes a detection device, which is constructed to identify the dual assistance of the braking force booster and the auxiliary braking force booster, and the detection device includes: an activation module; a signal input module, which is constructed to receive a brake pedal position signal and a measured brake master cylinder pressure signal; a calculation module, which is constructed to obtain a target brake master cylinder pressure corresponding to the brake pedal position signal; a comparison module, which is constructed to compare the target brake master cylinder pressure with the measured brake master cylinder pressure and output a comparison result; an identification module, which is constructed to identify the dual assistance based on the comparison result, wherein the activation module is configured to activate the identification module or the detection device when there is a communication failure in the brake force booster.

Description

Technical Field

[0001] The present application relates to the field of vehicle braking, and in particular to a braking system and a method for identifying dual-assistance of a braking force booster and an auxiliary braking force booster. Background Art

[0002] Current vehicles are usually equipped with a brake booster. In addition, in order to prevent the brake booster from malfunctioning, more and more vehicles are additionally equipped with an auxiliary brake booster. In this configuration, sometimes the brake booster and the auxiliary brake booster are simultaneously boosting, i.e., a double boosting situation. Summary of the invention

[0003] The technical solution of the present application is used to solve or at least alleviate the technical problems in the prior art.

[0004] Specifically, the present application aims to avoid the above-mentioned double-assistance situation during braking, because the double-assistance situation will cause noise and adversely affect the comfort of the driver and passengers.

[0005] According to one aspect of the present application, a braking system is provided. In particular, the braking system is provided with an auxiliary braking force booster, which is used as an auxiliary mechanism of the braking force booster, and is characterized in that the braking system includes a detection device for identifying the dual assistance of the braking force booster and the auxiliary braking force booster, and the detection device includes:

[0006] Activate the module;

[0007] a signal input module configured to receive a brake pedal position signal and a measured brake master cylinder pressure signal;

[0008] a calculation module configured to obtain a target brake master cylinder pressure corresponding to the brake pedal position signal;

[0009] a comparison module configured to compare the target master cylinder pressure with the measured master cylinder pressure and output a comparison result;

[0010] an identification module configured to identify the dual-assistance based on the comparison result, wherein:

[0011] The activation module is configured to activate the identification module when a communication failure occurs between the brake booster and the auxiliary brake booster.

[0012] According to another aspect of the present application, a method for identifying dual-boosting of a braking force booster and an auxiliary braking force booster is provided, comprising:

[0013] activating a recognition process when a communication failure exists between the brake booster and the auxiliary brake booster;

[0014] receiving a brake pedal position signal and a measured brake master cylinder pressure signal;

[0015] acquiring a target brake master cylinder pressure in response to the received brake pedal position signal;

[0016] comparing the target master cylinder pressure with the measured master cylinder pressure and outputting a comparison result;

[0017] Dual assist is identified based on the comparison result.

[0018] According to another aspect of the present application, a vehicle is provided, comprising a braking system according to any embodiment of the present application.

[0019] According to another aspect of the present application, a computer-readable storage medium is provided, on which a computer program is stored, wherein the program can be executed by a processor to perform the steps of the method described in any embodiment of the present application.

[0020] According to another aspect of the present application, a computer device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method described in any embodiment of the present application when executing the program. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In addition, similar numbers in the figures are used to represent similar components, among which:

[0022] Figure 1 A schematic diagram of a brake system according to the present application is shown; and

[0023] Figure 2 The flowchart of the method disclosed in the present application is schematically shown. DETAILED DESCRIPTION

[0024] Depend on Figure 1It can be seen that the braking system includes an auxiliary brake booster 20, which is used to support and assist the brake booster. In other words, when the brake booster or other functionally similar mechanisms fail and / or when the brake booster generated by the brake booster is insufficient, the auxiliary brake booster 20 can generate auxiliary braking force. In particular, when a communication failure occurs in the brake booster, that is, when the CAN communication is lost between the brake booster and the auxiliary brake booster 20 or the braking system, the auxiliary brake booster 20 will also be triggered to generate auxiliary brake booster. In this case, the auxiliary brake booster is relatively small, which can also meet the corresponding industry legal regulations. However, there are difficulties in the middle, because in the case of communication failure, it is difficult to determine or directly detect whether the brake booster is still working in the so-called single operation state (that is, in this state, only the brake booster is working). The brake booster is likely to still operate normally in the case of a communication failure, but this will lead to comfort problems caused by the double booster formed by the joint assistance of the brake booster and the auxiliary brake booster 20. Therefore, in the present application, a detection device is installed in the brake system for identifying the double braking of the brake booster and the auxiliary brake booster 20 .

[0025] refer to Figure 1 , which schematically describes the structure of the detection device 10 of the brake system 100 in a block diagram. The detection device 10 includes an activation module 1, a signal input module 2 for receiving a brake pedal position signal and a measured brake master cylinder pressure signal, a calculation module 3, a comparison module 4 and an identification module 5. Here, the activation module 1 can activate the identification module 5 or the detection device 10 under a preset situation, for example, when there is a communication failure between the brake booster and the auxiliary brake booster 20. The preset situation can also include some other types of communication failures, such as, for example, the brake booster loses communication with other mechanisms including the brake system 100 and / or the auxiliary brake booster 20.

[0026] In addition, based on the brake pedal position signal received by the signal input module 2, the calculation module 3 can simulate, calculate or emulate and then obtain the target brake master cylinder pressure corresponding to the received brake pedal position signal. Here, the methods and means for obtaining the target brake master cylinder pressure should be understood broadly, including but not limited to simulation, previous static calibration, interpolation calculation, etc. In addition, it can also be considered that the calculation module 3 is provided with a lookup table model (LUT) to obtain the target brake master cylinder pressure according to the brake pedal position. In the lookup table model, the received brake pedal position signal is set as an input and the corresponding target brake master cylinder pressure can be used as the output of the lookup table model. The target brake master cylinder pressure can be obtained by the calculation module 3.

[0027] Comparison module 4 can receive the measured master cylinder pressure from signal input module 2 and the target master cylinder pressure from calculation module 3. Comparison module 4 compares the measured master cylinder pressure with the target master cylinder pressure and outputs a comparison result.

[0028] The identification module 5 is configured to identify the above-mentioned double assist based on the comparison result and decide whether to trigger it based on the identified result. In some embodiments of the present application, it can be provided that the so-called double assist is identified in the following situation, including: the comparison result indicates that the measured brake master cylinder pressure is higher than the target brake master cylinder pressure. Alternatively, it can also be considered that the above-mentioned situation also includes: the comparison result indicates that the measured brake master cylinder pressure exceeds the predetermined limit of the target brake master cylinder pressure, that is, a predetermined threshold. It can be understood that other reasonable identification situations can also be performed.

[0029] In some embodiments of the present application, the detection device 10 may further include a self-checking module, which is configured to check the state of the brake pedal and / or the state of the auxiliary brake force booster 20. Specifically, the self-checking module may monitor the state of the brake pedal and / or the state of the auxiliary brake force booster 20 during the operation of the detection device 10 to ensure that the brake pedal and / or the auxiliary brake force booster 20 are under normal control, for example, the auxiliary braking force should be maintained in a reduced mode (i.e., the auxiliary braking force boost should be reduced) and / or the brake pedal operates normally.

[0030] In some embodiments disclosed in the present application, the activation module 1 can optionally include a fail-safe unit, which is designed to prevent the detection device 10 from working once a communication failure occurs in the brake system 100 or in the auxiliary brake force booster 20. This means that if a failure, such as a communication failure, occurs in the brake system 100 having other mechanisms, such as an ECU (electronic control unit) and a BCM, the entire detection device 10 is suppressed and the so-called dual-assistance recognition is therefore suppressed. This can ensure that the auxiliary brake force booster 20 still works normally, thereby preventing the brake force system from being unable to provide a braking force that meets regulatory requirements.

[0031] In some embodiments of the present application, the detection device 10 also includes an execution unit 6, which is configured to inhibit the auxiliary brake booster 20 when a double boost situation is identified. The execution unit 6 can be optionally designed to skip triggering the auxiliary brake booster 20 or to specify that the auxiliary brake booster 20 is in a suppressed state when a double boost situation is identified.

[0032] In some embodiments of the present application, it should be noted that the brake pedal position signal can be obtained or transmitted by a redundant brake pedal sensor, which means that the redundant brake pedal sensor is installed in other mechanisms of the vehicle instead of the brake pedal sensor in the brake booster.

[0033] refer to Figure 2 , which shows by way of example the flow of a method for identifying a double boost of a brake booster and an auxiliary brake booster 20. As described above, the auxiliary brake booster 20 acts as an auxiliary support mechanism of the brake booster. Likewise, the double boost here refers to the boost of the brake booster and the reduced boost of the auxiliary brake booster 20, which occurs when there is a communication fault in the brake booster or when there is a communication fault between the brake booster and other mechanisms of the vehicle.

[0034] In this application, the method comprises the following steps:

[0035] Activating the identification process S1 when a communication fault occurs in the brake booster;

[0036] Receiving a brake pedal position signal and a measured brake master cylinder pressure signal S2;

[0037] Acquire a target master cylinder pressure S3 corresponding to the received brake pedal position signal;

[0038] comparing the target master cylinder pressure with the measured master cylinder pressure and outputting a comparison result S4;

[0039] The dual-assist S5 is identified based on the comparison result.

[0040] In some embodiments of the present application, the activation of the identification process may also be triggered by other preset conditions, such as, for example, a communication failure between the brake booster and the auxiliary brake booster 20. The preset conditions may also include some other types of communication failures, such as, for example, the brake booster loses communication with other mechanisms including the brake system 100 and / or the auxiliary brake booster 20.

[0041] In some embodiments of the present application, based on the received brake pedal position signal, a simulation, calculation or emulation can be performed and then a target brake master cylinder pressure corresponding to the received brake pedal position signal can be obtained. Here, the methods and means for obtaining the target brake master cylinder pressure should be understood broadly, including but not limited to simulation, previous static calibration, interpolation calculation, etc. In addition, it is also possible to consider using a lookup table model (LUT) to obtain the target brake master cylinder pressure according to the brake pedal position. In the lookup table model, the received brake pedal position signal is set as an input and the corresponding target brake master cylinder pressure can be used as the output of the lookup table model.

[0042] Based on the comparison result, double assistance is identified and can be triggered accordingly. In some embodiments of the present application, it can be provided that the so-called double assistance is identified in the following situation, including: the comparison result indicates that the measured brake master cylinder pressure is higher than the target brake master cylinder pressure. Alternatively, it can also be considered that the above-mentioned situation also includes: the comparison result indicates that the measured brake master cylinder pressure exceeds the predetermined limit of the target brake master cylinder pressure, that is, a predetermined threshold. It can be understood that other reasonable identification situations can also be performed.

[0043] In some embodiments of the present application, the method can further include a self-checking step, which is configured to check the state of the brake pedal and / or the state of the auxiliary brake force booster 20. Specifically, in the self-checking step, the state of the brake pedal and / or the state of the auxiliary brake force booster 20 can be monitored during the operation of the brake system 100 to ensure that the brake pedal and / or the auxiliary brake force booster 20 are under normal control, for example, the auxiliary braking force should be maintained in a reduced mode (i.e., the auxiliary braking force boost should be reduced) and / or the brake pedal operates normally.

[0044] In some embodiments of the present application, the process of the method may include a fail-safe mode, which is designed to suppress the entire identification process from being implemented once a communication failure occurs in the brake system 100 or in the auxiliary brake booster 20. This means that if a failure occurs in the brake system 100 having other mechanisms, such as an ECU (electronic control unit) and a BCM, such as a communication failure, the entire identification process is suppressed and the so-called dual-assist identification is therefore suppressed. This can ensure that the auxiliary brake booster 20 still works normally, thereby preventing the brake system from being unable to provide a braking force that meets regulatory requirements.

[0045] In some embodiments of the present application, the method also includes an execution step, which is configured to inhibit the auxiliary brake booster 20 when a double boost situation is identified. In the execution step, it can be optionally designed to skip triggering the auxiliary brake booster 20 or to specify that the auxiliary brake booster 20 is in an inhibited state when a double boost situation is identified.

[0046] In some embodiments of the present application, it should be noted that the brake pedal position signal can be obtained or transmitted by a redundant brake pedal sensor, which means that the redundant brake pedal sensor is installed in other mechanisms of the vehicle instead of the brake pedal sensor in the brake booster.

Claims

1. A braking system (100) having an auxiliary brake booster (20), wherein the auxiliary brake booster (20) is configured as an auxiliary mechanism for a brake booster, characterized in that: The braking system (100) comprises a detection device (10), wherein the detection device (10) is configured to identify the dual assistance of the braking force booster and the auxiliary braking force booster (20), and the detection device (10) comprises: Activate module (1); A signal input module (2) is configured to receive a brake pedal position signal and a measured brake master cylinder pressure signal; A calculation module (3) configured to obtain a target brake master cylinder pressure corresponding to the brake pedal position signal; A comparison module (4) configured to compare the target master cylinder pressure with the measured master cylinder pressure and output a comparison result; an identification module (5) configured to identify the dual-assistance based on the comparison result, wherein the identification module (5) is configured to identify the dual-assistance in the following situations, including: the comparison result shows that the measured master brake cylinder pressure is greater than the target master brake cylinder pressure; and The activation module (1) is configured to activate the identification module (5) or the detection device (10) when a communication fault occurs in the brake booster.

2. The braking system (100) according to claim 1, characterized in that: The identification module (5) is configured to identify the dual assistance in the following situations, including: The comparison result shows that the measured master cylinder pressure exceeds a preset limit value of the target master cylinder pressure.

3. The braking system (100) according to claim 1, characterized in that: The communication failure includes a loss of communication between the brake booster and the auxiliary brake booster (20).

4. The braking system (100) according to claim 1, characterized in that: The calculation module (3) comprises a table lookup model, wherein the brake pedal position signal is designed as an input and the target brake master cylinder pressure is designed as an output.

5. The brake system (100) according to claim 1, characterized in that: The detection device (10) comprises a self-checking module, wherein the self-checking module is configured to check the state of the brake pedal and / or the auxiliary brake force booster (20).

6. The braking system (100) according to claim 1, characterized in that: The activation module (1) comprises a fail-safe unit, which is configured to inhibit the operation of the detection device (10) when a communication failure occurs in the auxiliary brake force booster (20) or the brake system (100).

7. The braking system (100) according to claim 2, characterized in that: The detection device (10) comprises an actuator unit (6) which is designed to inhibit the operation of the auxiliary brake booster (20) when the double boosting is detected.

8. The brake system (100) according to claim 1, characterized in that: The brake pedal position signal is provided by a redundant brake pedal sensor.

9. A method for identifying dual boosting of a brake booster and an auxiliary brake booster (20), comprising: When a communication fault occurs in the brake booster, the following identification process is activated (S1); receiving a brake pedal position signal and a measured brake master cylinder pressure signal (S2); Obtaining a target brake master cylinder pressure corresponding to the received brake pedal position signal (S3) comparing the target master cylinder pressure with the measured master cylinder pressure and outputting a comparison result (S4); The dual assistance is identified based on the comparison result (S5), wherein, within the scope of identifying the dual assistance, the dual assistance is identified under the following circumstances, including: the comparison result shows that the measured master brake cylinder pressure is greater than the target master brake cylinder pressure.

10. The method according to claim 9, characterized in that In the context of identifying the double assistance, the double assistance is identified in the following circumstances, including: the comparison result shows that the measured master brake cylinder pressure exceeds a preset limit value of the target master brake cylinder pressure.

11. The method according to claim 9, characterized in that The communication failure includes a loss of communication between the brake booster and the auxiliary brake booster (20).

12. The method according to claim 9, characterized in that: The target master cylinder pressure is obtained by a table lookup model, wherein the brake pedal position signal is designed as an input of the table lookup model and the target master cylinder pressure is designed as an output of the table lookup model.

13. The method according to claim 9, characterized in that: The method comprises a self-checking step, wherein in the self-checking step, the state of the brake pedal and / or the auxiliary brake force booster (20) is checked.

14. The method according to claim 9, characterized in that The method comprises a fail-safe step, wherein the execution of the identification process is suppressed as soon as a communication fault occurs in the auxiliary brake force booster (20) or in a brake system (100) having the auxiliary brake force booster (20).

15. The method according to claim 9, characterized in that The method comprises an execution step, wherein the operation of the auxiliary brake booster (20) is inhibited when the double boosting is detected.

16. The method according to claim 9, characterized in that The brake pedal position signal is provided by a redundant brake pedal sensor.

17. A vehicle, characterized in that It comprises a brake system (100) according to any one of claims 1 to 8.

18. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 9 to 16 are implemented.

19. A computer-readable storage medium having a computer program stored thereon, characterized in that: The computer program is executed by a processor to implement the steps of the method according to any one of claims 9 to 16.

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