CN113085824A - Brake system and method for detecting dual assistance of a brake booster and an auxiliary brake booster - Google Patents
Brake system and method for detecting dual assistance of a brake booster and an auxiliary brake booster Download PDFInfo
- Publication number
- CN113085824A CN113085824A CN201911337114.4A CN201911337114A CN113085824A CN 113085824 A CN113085824 A CN 113085824A CN 201911337114 A CN201911337114 A CN 201911337114A CN 113085824 A CN113085824 A CN 113085824A
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- brake
- master cylinder
- cylinder pressure
- force booster
- brake force
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- 230000009977 dual effect Effects 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims description 34
- 238000001514 detection method Methods 0.000 claims abstract description 22
- 238000004364 calculation method Methods 0.000 claims abstract description 12
- 230000004913 activation Effects 0.000 claims abstract description 11
- 230000007246 mechanism Effects 0.000 claims abstract description 10
- 230000003213 activating effect Effects 0.000 claims description 5
- 238000004590 computer program Methods 0.000 claims description 4
- 230000002401 inhibitory effect Effects 0.000 claims 1
- 238000004088 simulation Methods 0.000 description 5
- 230000001960 triggered effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
- B60T7/02—Brake-action initiating means for personal initiation
- B60T7/04—Brake-action initiating means for personal initiation foot actuated
- B60T7/042—Brake-action initiating means for personal initiation foot actuated by electrical means, e.g. using travel or force sensors
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The present application relates to a brake system having an auxiliary brake force booster configured to serve as an auxiliary mechanism of the brake force booster, characterized in that the brake system includes a detection device configured to identify a double assist of the brake force booster and the auxiliary brake force booster, the detection device including: an activation module; a signal input module configured to receive a brake pedal position signal and a measured master cylinder pressure signal; a calculation module configured to obtain a target brake master cylinder pressure corresponding to the brake pedal position signal; a comparison module configured to compare the target master cylinder pressure with the measured master cylinder pressure and output a comparison result; an identification module configured to identify the dual assistance force based on the comparison result, wherein the activation module is provided to activate the identification module or the detection device when there is a communication failure in the brake force booster.
Description
Technical Field
The present application relates to the field of braking of vehicles, in particular to a braking system and a method for identifying a dual assistance of a brake force booster and an auxiliary brake force booster.
Background
Current vehicles are generally equipped with a brake force booster. In addition, to prevent possible failure of the brake force booster, more and more vehicles are additionally equipped with an auxiliary brake force booster. With this configuration, it sometimes results in the case where the braking force booster and the auxiliary braking force booster are simultaneously assisted, that is, double assist.
Disclosure of Invention
The technical solution of the present application is used to solve or at least alleviate technical problems in the prior art.
In particular, the present application aims to avoid the double power assistance situation described above during braking, since it causes noise and adversely affects the comfort of the driver and passengers.
According to one aspect of the present application, a braking system is provided. In particular, the brake system is provided with an auxiliary brake force booster serving as an auxiliary mechanism for the brake force booster, characterized in that the brake system comprises a detection device for identifying a double assistance of the brake force booster and the auxiliary brake force booster, the detection device comprising:
an activation module;
a signal input module configured to receive a brake pedal position signal and a measured master cylinder pressure signal;
a calculation module configured to obtain a target brake master cylinder pressure corresponding to the brake pedal position signal;
a comparison module configured to compare the target master cylinder pressure with the measured master cylinder pressure and output a comparison result;
an identification module configured to identify the dual assist force based on the comparison result, wherein,
the activation module is provided for activating the identification module when there is a communication fault between the brake booster and the auxiliary brake booster.
According to another aspect of the present application, a method for identifying a dual boosting of a brake force booster and an auxiliary brake force booster is provided, comprising:
activating an identification process when there is a communication fault between the brake force booster and the auxiliary brake force booster;
receiving a brake pedal position signal and a measured brake master cylinder pressure signal;
obtaining a target brake master cylinder pressure corresponding to the received brake pedal position signal;
comparing the target master cylinder pressure with the measured master cylinder pressure and outputting a comparison result;
identifying a dual assist based on the comparison.
According to another aspect of the present application, there is provided a vehicle comprising a braking system according to any of the embodiments of the present application.
According to another aspect of the application, a computer-readable storage medium is provided, on which a computer program is stored, wherein the program is capable of executing the steps of the method according to any of the embodiments of the application by a processor.
According to yet another aspect of the application, a computer device is provided, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor, when executing the program, implements the steps of the method described according to any of the embodiments of the application.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are for illustrative purposes only and are not intended to constitute a limitation on the scope of the present invention. Moreover, in the drawings, like numerals are used to indicate like parts, and in which:
FIG. 1 schematically illustrates a block diagram of a braking system according to the present disclosure; and
fig. 2 schematically shows a flow chart of a method according to the present disclosure.
Detailed Description
As can be seen from fig. 1, the brake system comprises an auxiliary brake force booster 20, which serves to support and assist the brake force booster. In other words, the auxiliary brake force booster 20 is able to generate an auxiliary brake force when the brake force booster or other functionally similar mechanism fails and/or when the brake force boost generated by the brake force booster is insufficient. In particular, if a communication error occurs in the brake booster, i.e. a CAN communication is lost between the brake booster and the auxiliary brake force booster 20 or the brake system, the auxiliary brake force booster 20 is also triggered to generate an auxiliary brake force boost. In this case, the auxiliary brake force assistance is relatively small here, which also meets the relevant industrial legal requirements. However, this is problematic because, in the event of a communication failure, it is difficult to determine or detect directly whether the brake booster is still operating in a so-called stand-alone operating state (i.e., in this state, only the brake booster is operating). The brake force booster is likely to still operate properly in the event of a communication failure, which, however, can lead to comfort problems caused by the dual assistance force formed by the combined assistance of the brake force booster and the auxiliary brake force booster 20. In the present application, therefore, a detection device is installed in the brake system to detect the double braking of the brake force booster and the auxiliary brake force booster 20.
Referring to fig. 1, the structure of a detection device 10 of a brake system 100 is schematically depicted in a block diagram. The detection device 10 comprises an activation module 1, a signal input module 2 for receiving a brake pedal position signal and a measured master cylinder pressure signal, a calculation module 3, a comparison module 4 and an identification module 5. The activation module 1 can activate the identification module 5 or the detection device 10 in a predetermined situation, for example, when there is a communication failure between the brake booster and the auxiliary brake booster 20, the identification module 5 or the detection device 10 being activated. The predetermined conditions can also include some other type of communication failure, such as, for example, the brake force booster losing communication with other mechanisms, including the brake system 100 and/or the auxiliary brake force booster 20.
Furthermore, based on the brake pedal position signal received by the signal input module 2, the calculation module 3 can perform a simulation, calculation or emulation and then obtain a target master cylinder pressure corresponding to the received brake pedal position signal. The method and means for obtaining the target master cylinder pressure should be broadly understood herein and include, but are not limited to, simulations, previous static calibrations, interpolation calculations, and the like. Furthermore, it is also conceivable that the computation module 3 is provided with a look-up table model (LUT) for deriving the target brake master cylinder pressure from the brake pedal position. In a look-up table model, the received brake pedal position signal is set as an input and the corresponding target brake master cylinder pressure can be the output of the look-up table model. The target brake master cylinder pressure can be derived by the calculation module 3.
The comparison module 4 can obtain the measured master cylinder pressure from the signal input module 2 and the target master cylinder pressure from the calculation module 3. The comparison module 4 compares the measured master cylinder pressure with the target master cylinder pressure and outputs the comparison result.
The recognition module 5 is designed to recognize the double assistance force described above on the basis of the comparison result and to decide whether or not to trigger on the basis of the recognized result. In some embodiments of the present application, it can be provided that a so-called double assist is identified in the following cases, including: the comparison indicates that the measured master cylinder pressure is higher than the target master cylinder pressure. Alternatively, it is also conceivable that the above-mentioned cases also include: the comparison result indicates that the measured master cylinder pressure exceeds the target master cylinder pressure by a predetermined limit, i.e. a predetermined threshold value. It will be appreciated that other reasonable identification scenarios may be implemented.
In some embodiments of the present application, the detection device 10 may further include a self-test module configured to check the status of the brake pedal and/or the status of the auxiliary brake force booster 20. In particular, the self-test module may monitor the state of the brake pedal and/or the state of the auxiliary brake force booster 20 during operation of the detection device 10 in order to ensure that the brake pedal and/or the auxiliary brake force booster 20 is under normal control, for example that the auxiliary brake force should be kept in a reduced mode (i.e. the auxiliary brake force booster should be reduced) and/or that the brake pedal is operating normally.
In some embodiments disclosed herein, the activation module 1 can optionally comprise a fail-safe unit, which is designed to prevent the detection device 10 from being disabled in the event of a communication failure in the brake system 100 or in the auxiliary brake force booster 20. This means that if a fault, such as, for example, a communication fault, occurs in the brake system 100 with other means, such as, for example, an ECU (electronic control unit) and a BCM, the entire detection device 10 is suppressed and so-called double power identification is thus suppressed. This ensures that the auxiliary brake force booster 20 is still operating properly, thereby preventing the brake force system from being unable to provide a brake force that meets the regulatory requirements.
In some exemplary embodiments of the present application, the detection device 10 also comprises an actuating unit 6, which is provided to suppress the auxiliary brake force booster 20 when a double boosting situation is detected. The actuating unit 6 can optionally be designed to skip the triggering of the auxiliary brake booster 20 when double boosting is detected or to provide that the auxiliary brake booster 20 is in a suppressed state.
In some embodiments of the present application, it should be noted that the brake pedal position signal may be derived or transmitted from redundant brake pedal sensors. This means that the redundant brake pedal sensor is installed in another mechanism of the vehicle than the brake pedal sensor in the brake force booster.
Referring to fig. 2, a flowchart of a method for identifying a brake force booster and assisting the dual assistance of the brake force booster 20 is shown as an example. As described above, the auxiliary brake force booster 20 functions as an auxiliary support mechanism of the brake force booster. The dual assistance is likewise a assistance force of the brake force booster and a reduced assistance force of the auxiliary brake force booster 20, which occurs when there is a communication fault in the brake force booster or between the brake force booster and other mechanisms of the vehicle.
In the present application, the method comprises the steps of:
activating an identification process S1 when there is a communication failure in the brake force booster;
receiving a brake pedal position signal and a measured master cylinder pressure signal S2;
acquiring a target master cylinder pressure S3 corresponding to the received brake pedal position signal;
comparing the target master cylinder pressure with the measured master cylinder pressure and outputting a comparison result S4;
identifying a dual assist force based on the comparison result S5.
In some exemplary embodiments of the present application, the activation of the identification process can also be triggered as a function of other predetermined conditions, such as, for example, a communication error between the brake booster and the auxiliary brake booster 20. The predetermined condition may also include some other type of communication failure, such as, for example, the loss of communication of the brake force booster with other mechanisms, including brake system 100 and/or auxiliary brake force booster 20.
In some embodiments of the present application, based on the received brake pedal position signal, a simulation, calculation, or simulation can be performed and then a target master cylinder pressure corresponding to the received brake pedal position signal is obtained. The method and means for obtaining the target master cylinder pressure should be broadly understood herein and include, but are not limited to, simulations, previous static calibrations, interpolation calculations, and the like. In addition, it is also conceivable to obtain the target master cylinder pressure from the brake pedal position using a look-up table model (LUT). In a look-up table model, the received brake pedal position signal is set as an input and the corresponding target brake master cylinder pressure can be the output of the look-up table model.
Based on the comparison result, a double assistance force is recognized and can be triggered accordingly. In some embodiments of the present application, it can be provided that a so-called double assist is identified in the following cases, including: the comparison indicates that the measured master cylinder pressure is higher than the target master cylinder pressure. Alternatively, it is also conceivable that the above-mentioned cases also include: the comparison result indicates that the measured master cylinder pressure exceeds the target master cylinder pressure by a predetermined limit, i.e. a predetermined threshold value. It will be appreciated that other reasonable identification scenarios may be implemented.
In some embodiments of the present application, the method can further include a self-test step configured to check the state of the brake pedal and/or the state of the auxiliary brake force booster 20. Specifically, during the self-test step, the state of the brake pedal and/or the state of auxiliary brake force booster 20 may be monitored during operation of brake system 100 to ensure that the brake pedal and/or auxiliary brake force booster 20 is under normal control, e.g., that the auxiliary brake force should remain in a reduced mode (i.e., auxiliary brake force boost should be reduced) and/or that the brake pedal is operating normally.
In some exemplary embodiments of the present application, the process of the method may include a failsafe mode, which is designed to prevent the entire detection process from being able to be carried out in the event of a communication failure in the brake system 100 or in the auxiliary brake force booster 20. This means that if a fault, such as, for example, a communication fault, occurs in the brake system 100 with other means, such as, for example, an ECU (electronic control unit) and a BCM, the entire recognition process is suppressed and the so-called double-power recognition is thus suppressed. This ensures that the auxiliary brake force booster 20 is still operating properly, thereby preventing the brake force system from being unable to provide a brake force that meets the regulatory requirements.
In some embodiments of the present application, the method also includes an executing step configured to inhibit auxiliary brake force booster 20 when a dual assist condition is identified. In the execution step, it can optionally be provided that the triggering of the auxiliary brake force booster 20 is skipped or that the auxiliary brake force booster 20 is in a suppressed state when a double boost is detected.
In some embodiments of the present application, it should be noted that the brake pedal position signal may be derived or transmitted from redundant brake pedal sensors. This means that the redundant brake pedal sensor is installed in another mechanism of the vehicle than the brake pedal sensor in the brake force booster.
Claims (21)
1. Brake system (100) having an auxiliary brake force booster (20) configured to act as an auxiliary mechanism for the brake force booster, characterized in that the brake system (100) comprises a detection device (10) configured to identify a double assistance of the brake force booster and the auxiliary brake force booster (20), the detection device (10) comprising:
an activation module (1);
a signal input module (2) configured to receive a brake pedal position signal and a measured 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 to output a comparison result;
an identification module (5) configured to identify the dual assistance force based on the comparison result, wherein,
the activation module (1) is provided for activating the identification module (5) or the detection device (10) when there is a communication fault in the brake booster.
2. A braking system (100) according to claim 1, characterized in that the identification module (5) is arranged for identifying the double power assistance in a situation comprising:
the comparison result shows that the measured master cylinder pressure is greater than the target master cylinder pressure.
3. A braking system (100) according to claim 2, characterized in that the identification module (5) is arranged for identifying the double power assistance in a situation comprising:
and the comparison result shows that the measured pressure of the brake master cylinder exceeds the preset limit value of the target pressure of the brake master cylinder.
4. The brake system (100) of claim 1, wherein the communication failure includes a loss of communication between the brake force booster and the auxiliary brake force booster (20).
5. The brake system (100) of claim 1, wherein the calculation module (3) comprises a look-up table model, wherein the brake pedal position signal is designed as an input and the target brake master cylinder pressure is designed as an output.
6. A braking system (100) according to claim 1, characterized in that the detection device (10) comprises a self-test module, wherein the self-test module is provided for checking the status of a brake pedal and/or of the auxiliary brake force booster (20).
7. The brake system (100) according to claim 1, characterized in that the activation module (1) comprises a fail-safe unit provided for inhibiting the operation of the detection device (10) in the event of a communication failure in the auxiliary brake force booster (20) or in the brake system (100).
8. The brake system (100) according to claim 2, wherein the detection device (10) comprises an execution unit (6) configured to suppress the auxiliary brake force booster (20) from operating when the double boost is identified.
9. The braking system (100) of claim 1, wherein the brake pedal position signal is provided by a redundant brake pedal sensor.
10. Method for detecting a dual assistance of a brake force booster and an auxiliary brake force booster (20), comprising:
activating the following recognition process when there is a communication failure in the brake force booster (S1);
receiving a brake pedal position signal and a measured master cylinder pressure signal (S2);
acquiring a target 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);
identifying the dual assist force based on the comparison result (S5).
11. The method of claim 10, wherein in identifying the range of dual assist, the dual assist is identified if: the comparison result shows that the measured master cylinder pressure is greater than the target master cylinder pressure.
12. The method of claim 11, wherein in identifying the range of dual assist, the dual assist is identified if: and the comparison result shows that the measured pressure of the brake master cylinder exceeds the preset limit value of the target pressure of the brake master cylinder.
13. The method of claim 10, wherein the communication failure comprises a loss of communication between the brake force booster and the auxiliary brake force booster (20).
14. The method of claim 10, wherein the target brake master cylinder pressure is obtained by a look-up table model, wherein the brake pedal position signal is designed as an input to the look-up table model and the target brake master cylinder pressure is designed as an output from the look-up table model.
15. Method according to claim 10, characterized in that the method comprises a self-test step, wherein in the self-test step the state of the brake pedal and/or of the auxiliary brake force booster (20) is checked.
16. The method according to claim 10, characterized in that it comprises a fail-safe step, in which the implementation of an identification process is suppressed in the event of a communication failure in the auxiliary brake force booster (20) or in the brake system (100).
17. The method according to claim 10, characterized in that it comprises an execution step in which the auxiliary brake booster (20) is suppressed from operating when the double boost is recognized.
18. The method of claim 10, wherein the brake pedal position signal is provided by a redundant brake pedal sensor.
19. Vehicle comprising a braking system (100) according to any one of claims 1 to 9.
20. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method according to any of claims 10-18 are implemented when the program is executed by the processor.
21. A computer-readable storage medium, on which a computer program is stored, characterized in that the program is executed by a processor to implement the steps of the method according to any of claims 10-18.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911337114.4A CN113085824A (en) | 2019-12-23 | 2019-12-23 | Brake system and method for detecting dual assistance of a brake booster and an auxiliary brake booster |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911337114.4A CN113085824A (en) | 2019-12-23 | 2019-12-23 | Brake system and method for detecting dual assistance of a brake booster and an auxiliary brake booster |
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| Publication Number | Publication Date |
|---|---|
| CN113085824A true CN113085824A (en) | 2021-07-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911337114.4A Pending CN113085824A (en) | 2019-12-23 | 2019-12-23 | Brake system and method for detecting dual assistance of a brake booster and an auxiliary brake booster |
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| Country | Link |
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| CN (1) | CN113085824A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114394227A (en) * | 2022-03-21 | 2022-04-26 | 中国商用飞机有限责任公司 | Force-sensing brake device, brake system, brake control method and airplane |
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