CN115214593B - Detection method, device, processing method, control system and medium for stuck fault - Google Patents
Detection method, device, processing method, control system and medium for stuck fault Download PDFInfo
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- CN115214593B CN115214593B CN202210852949.9A CN202210852949A CN115214593B CN 115214593 B CN115214593 B CN 115214593B CN 202210852949 A CN202210852949 A CN 202210852949A CN 115214593 B CN115214593 B CN 115214593B
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- 238000001514 detection method Methods 0.000 title claims abstract description 35
- 238000003672 processing method Methods 0.000 title abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 54
- 230000008569 process Effects 0.000 claims abstract description 22
- 230000008859 change Effects 0.000 claims description 62
- 238000012545 processing Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 230000001429 stepping effect Effects 0.000 description 12
- 230000000994 depressogenic effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
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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
- B60T17/221—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems
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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
- 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
- B60T13/24—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 gaseous
- B60T13/46—Vacuum systems
- B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The application relates to the technical field of automobiles, and provides a vacuum degree signal clamping stagnation fault detection method, a vacuum degree signal clamping stagnation fault detection device and a vacuum degree signal clamping stagnation fault processing method, wherein the method comprises the following steps: judging whether effective stepping on the brake pedal occurs or not; if the brake pedal is effectively stepped, judging whether the brake pedal is continuously braked; if the brake is continuously braked, judging whether the brake pedal is effectively released or not; if the brake pedal is effectively released, obtaining the maximum value and the minimum value of the vacuum pressure in the process from the effective stepping on of the brake pedal to the effective releasing of the brake pedal; and judging the clamping stagnation condition of the vacuum degree signal according to the difference value of the maximum value and the minimum value of the vacuum pressure. By reading the brake pedal signal, the vacuum degree signal and the like to carry out logic control, the clamping stagnation fault of the vacuum degree signal can be timely detected, and the phenomenon that the running safety is affected due to the fact that the electronic vacuum pump cannot be accurately and timely controlled to work and the brake hardness caused by insufficient vacuum is prevented.
Description
Technical Field
The application relates to the technical field of automobiles, in particular to a vacuum degree signal clamping stagnation fault detection method, a vacuum degree signal clamping stagnation fault detection device, a vacuum degree signal clamping stagnation fault processing method, a vacuum degree signal clamping stagnation fault control system and a vacuum degree signal clamping stagnation fault control method.
Background
As new energy vehicle types keep vehicles to continue to grow, the safety of the new energy vehicles is also gradually paid attention to. The brake booster system of the new energy automobile adopts the electronic vacuum pump as the sole vacuum source, the electronic vacuum pump is mainly controlled by the real-time vacuum degree signal provided by the vacuum degree sensor, and the accuracy of the vacuum degree signal relates to whether the brake system can accurately and timely control the electronic vacuum pump to work or not, so that enough booster is provided to ensure the driving safety. If the vacuum degree signal has a clamping failure (the vacuum degree signal does not change along with the change of the pressure in the electronic vacuum pump), the control device cannot accurately control the electronic vacuum pump to work and supplement vacuum in time, so that a brake pedal is hard, the vehicle cannot be braked, and the driving safety cannot be guaranteed.
Disclosure of Invention
Based on the above, it is necessary to provide a method, a device, a method for processing vacuum degree signal jamming fault, a control system and a storage medium for solving the problem that the existing new energy automobile may lack driving safety guarantee.
A first aspect of the embodiment of the application provides a method for detecting a vacuum degree signal jamming fault, which comprises the following steps:
judging whether effective stepping on the brake pedal occurs or not;
if the brake pedal is effectively stepped, judging whether the brake pedal is continuously braked;
if the brake is continuously braked, judging whether the brake pedal is effectively released or not;
if the brake pedal is effectively released, obtaining the maximum value and the minimum value of the vacuum pressure in the process from the effective stepping on of the brake pedal to the effective releasing of the brake pedal;
and judging the clamping stagnation condition of the vacuum degree signal according to the difference value of the maximum value and the minimum value.
A second aspect of the embodiment of the application provides a method for processing vacuum degree signal clamping stagnation faults, which comprises the following steps:
when the vacuum degree signal is detected to have the clamping stagnation fault by the vacuum degree signal clamping stagnation fault detection method, the electronic vacuum pump is subjected to open-loop control.
A third aspect of the embodiment of the present application provides a device for detecting a stuck fault of a vacuum signal, including:
a first judging module: for determining whether an effective depression of the brake pedal has occurred;
and a second judging module: if the brake pedal is effectively stepped, judging whether the brake pedal is continuously braked;
and a third judging module: for judging whether or not effective release of the brake pedal occurs if it is judged that the braking is continued;
the acquisition module is used for: the method comprises the steps of obtaining a maximum value and a minimum value of vacuum pressure in the process from the effective stepping of the brake pedal to the effective release of the brake pedal if the effective release of the brake pedal occurs;
and a fault judging module: and the clamping stagnation condition of the vacuum degree signal is judged according to the difference value of the maximum value and the minimum value.
A fourth aspect of the embodiment of the present application provides a control system, including a memory, a processor, and computer readable instructions stored in the memory and executable on the processor, where the processor implements the method for detecting the vacuum level signal stuck fault or implements the method for processing the vacuum level signal stuck fault when executing the computer readable instructions.
A fifth aspect of embodiments of the present application provides one or more readable storage media storing computer-readable instructions that, when executed by one or more processors, cause the one or more processors to perform a method for detecting a stuck fault in a vacuum level signal as described above or to perform a method for handling a stuck fault in a vacuum level signal as described above.
The embodiment of the application provides a vacuum degree signal clamping failure detection method, when a brake pedal is stepped on or released to cause the change of a brake pedal signal, the pressure of an electronic vacuum pump is changed along with the change of the vacuum degree signal output by a vacuum degree sensor, wherein the change of the vacuum degree signal can be reflected by the value of the vacuum pressure, and the change of the brake pedal signal and the change of the vacuum degree signal are synchronous, so that the clamping condition of the vacuum degree signal can be judged according to the difference value between the maximum value and the minimum value of the vacuum pressure, namely the maximum change range of the vacuum pressure in the process from the effective stepping on of the brake pedal to the effective release of the brake pedal. According to the scheme, logic control is performed by reading the brake pedal signal, the vacuum degree signal and the like, so that the clamping stagnation fault of the vacuum degree signal can be timely detected, and the phenomenon that the running safety is influenced due to the fact that the electronic vacuum pump cannot be accurately and timely controlled to work, so that braking hardness caused by insufficient vacuum is caused is prevented.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments of the present application will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an implementation flow of a method for detecting a stuck fault of a vacuum signal in an embodiment of the present application;
FIG. 2 is a schematic diagram of a vacuum signal stuck fault detection apparatus according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a control system according to an embodiment of the application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that in the description of embodiments of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
The method for detecting the stuck fault of the vacuum degree signal and the fault processing method provided by the embodiment of the application can be applied to a vehicle comprising a control system and a master cylinder/slave cylinder pressure signal, the control system reads a brake pedal signal, a vacuum degree signal and the like, logic control is carried out through the read signals, whether the stuck fault exists in the vacuum degree signal is judged, and if the stuck fault exists in the vacuum degree signal, a fault processing mode can be started, so that the brake system can provide enough power assistance, and the driving safety is ensured.
Referring to fig. 1, fig. 1 is a flowchart showing an implementation method of a vacuum degree signal stuck fault detection method in an embodiment of the application, including the following steps:
s11: it is determined whether an effective depression of the brake pedal has occurred.
In step S11, when the pedal opening of the brake pedal satisfies the preset condition, the brake pedal is effectively stepped, otherwise, after the preset time is paused, the detection of the stuck fault of the vacuum signal is restarted, where the preset time may be calibrated, for example, 200ms is taken.
In this embodiment, if the pedal opening of the brake pedal is smaller, so that the vacuum degree variation is smaller, the vacuum degree variation corresponding to the difference between the maximum value and the minimum value of the finally detected vacuum pressure may be confused, and it cannot be judged whether the vacuum degree variation caused by the smaller pedal opening is small or the vacuum degree variation is small due to the vacuum degree signal clamping failure, so in order to ensure the detection accuracy of the vacuum degree signal clamping failure, the scheme control is based on the condition that the pedal opening of the brake pedal meets the preset condition, that is, the pedal is effectively stepped on. In other embodiments, if the vacuum degree signal (vacuum pressure) is greater than the low vacuum alarm threshold, that is, if the vacuum degree is low, it is not determined whether the brake pedal is effectively depressed, but the low vacuum alarm is directly performed, and the detection flow is stopped.
As an embodiment of the present application, the determining whether effective depression of the brake pedal occurs includes: and if the target pedal opening of the brake pedal is detected to be equal to or larger than a first opening threshold value, and the target pedal opening rate corresponding to the target pedal opening is detected to be equal to or larger than a preset rate threshold value, judging that effective pedal pressing of the brake pedal occurs.
In this embodiment, the above-mentioned preset condition may be that the target pedal opening of the brake pedal is equal to or greater than a first opening threshold, and the target pedal opening rate corresponding to the target pedal opening is equal to or greater than a preset rate threshold, where the target pedal opening refers to a ratio of the brake pedal travel change to the total brake pedal travel, the first opening threshold and the preset rate threshold may be set by calibration according to the characteristics of the vehicle, and as an example, the first opening threshold may be 10.5%, and the preset rate threshold may be 24%/s. As an embodiment, when the target pedal opening of the brake pedal is continuously equal to or greater than the first opening threshold and the target pedal opening rate is continuously equal to or greater than the preset rate threshold, it is determined that effective pedal depression occurs, where the preset time period may be calibrated, for example, by taking 15 to 30 operation cycles, and each operation cycle may take 10ms. Otherwise, if either the target pedal opening or the target pedal opening rate does not meet the conditions, the detection of the vacuum degree signal jamming fault is suspended, and after a preset time period, the detection of the vacuum degree signal jamming fault is restarted, wherein the preset time period can be calibrated, for example, 200ms is taken. The effectiveness of the stepping action of the brake pedal is ensured through the dual redundancy of the brake pedal opening change signal and the brake pedal opening rate change signal.
S12: if the brake pedal is effectively stepped, judging whether the brake pedal is continuously braked;
in this embodiment, since the brake booster system uses the electronic vacuum pump as the sole vacuum source, and the electronic vacuum pump is mainly controlled by the real-time vacuum degree signal provided by the vacuum degree sensor, the detection of the stuck fault of the vacuum degree signal needs to be performed in the continuous braking environment.
As an embodiment of the present application, the determining whether the braking is continuous braking includes:
monitoring the opening of the target pedal in real time, and judging that the brake is continuously applied if the opening of the target pedal is continuously equal to or greater than a second opening threshold value;
if the target pedal opening is smaller than the second opening threshold, the detection process is exited, and after a preset time period is paused, the target pedal opening is re-detected, and whether the brake pedal is effectively stepped is judged.
In this embodiment, the condition of the continuous braking includes that the target pedal opening is continuously equal to or greater than a second opening threshold value, wherein the second opening threshold value may be set by calibration according to the characteristics of the vehicle itself, for example, 10% or the like may be preferable. In other embodiments, the condition of continuous braking may further include the brake light switch being in an on state. If it is determined that the continuous braking is not established, that is, the target pedal opening is smaller than the second opening threshold, the detection logic is exited, and the detection of the stuck fault of the vacuum degree signal is started again after a preset time period is paused, and the process of step S11 is performed again, wherein the preset time period can be calibrated, for example, 200ms is preferable.
S13: if the brake is continuously braked, judging whether the brake pedal is effectively released or not;
in the present embodiment, when it is determined that the brake pedal is effectively depressed and it is determined that the vehicle is in continuous braking, it is further determined whether or not effective release of the brake pedal has occurred.
As an embodiment of the present application, the determining whether the effective release of the brake pedal occurs includes: acquiring a corresponding relation between a target pedal opening of the brake pedal and virtual master cylinder pressure; the corresponding relation is obtained by calibrating the actual pedal opening change acquisition data and the actual master cylinder pressure change acquisition data corresponding to at least one test real vehicle; determining a virtual master cylinder pressure change slope based on the correspondence and a target pedal opening change of the brake pedal; and when the pressure change slope of the virtual master cylinder meets a preset condition, judging that the brake pedal is effectively released.
In this embodiment, considering that the detection scheme of the stuck fault of the vacuum degree signal can be applied to the vehicle without the master cylinder pressure as well, the present embodiment estimates the correspondence between the actual pedal opening change acquisition data and the actual master cylinder pressure change acquisition data by the actual pedal opening change acquisition data and the actual master cylinder pressure change acquisition data corresponding to at least one test vehicle, and the correspondence is also applicable to the target brake pedal opening and the virtual master cylinder pressure. As an example, the correspondence between the target brake pedal opening and the virtual master cylinder pressure may be shown in table 1 below, and it is known that the virtual master cylinder pressure varies in positive correlation with the target pedal opening, and when the brake pedal is depressed, the virtual master cylinder pressure increases with an increase in the target pedal opening, and when the brake pedal is released, the virtual master cylinder pressure decreases with a decrease in the target pedal opening.
| Target pedal opening (%) | 0 | …… | …… | 100 |
| Virtual master cylinder pressure (bar) | 0 | …… | …… | 92 |
TABLE 1
After the corresponding relation between the target brake pedal opening and the virtual master cylinder pressure is obtained, for the vehicle without the master cylinder pressure signal, the change of the virtual master cylinder pressure can be estimated only according to the change of the target brake pedal opening. When the virtual master cylinder pressure change slope satisfies a preset condition and the target brake pedal opening satisfies a condition for continuous braking, it may be determined that an effective release of the brake pedal occurs. The preset conditions include, but are not limited to, when the slope of the virtual master cylinder pressure change is equal to or smaller than a preset slope threshold, the brake pedal is judged to be effectively released, the preset slope threshold is a negative value, specific values can be set in a calibrated mode according to actual vehicle characteristics, for example, the preset slope threshold can be-12.5 bar/s and the like. The detection scheme of the vacuum degree signal clamping stagnation fault does not need a master cylinder pressure signal as verification, is suitable for vehicles without the master cylinder pressure signal, such as ESP configuration, ABS configuration vehicles and the like, has an expanded application range, and saves development cost.
S14: if the brake pedal is effectively released, obtaining the maximum value and the minimum value of the vacuum pressure in the process from the effective stepping on of the brake pedal to the effective releasing of the brake pedal;
in step S14, the vacuum pressure refers to a pressure signal output by the vacuum degree sensor, and a change in the vacuum pressure can be used to reflect a change in the vacuum degree signal.
In the present embodiment, the maximum variation range of the vacuum pressure can be obtained by obtaining the maximum value and the minimum value of the vacuum pressure in the process from the judgment of the step S11 that the effective depression of the brake pedal occurs to the judgment of the step S14 that the effective release of the brake pedal occurs. And judging whether the vacuum degree signal has a clamping stagnation fault or not, and judging whether the maximum variation range of the vacuum pressure reaches an expected threshold range or not only, if not, judging that the vacuum degree signal has the clamping stagnation fault.
As an embodiment of the present application, after the determining whether effective brake pedal depression occurs, the method further includes: if the effective tread of the brake pedal occurs, recording the initial moment of the effective tread of the brake pedal as a first moment;
the obtaining of the maximum and minimum vacuum pressure values from the effective brake pedal depression to the effective brake pedal release comprises: accumulating corresponding target values by a counter based on the virtual master cylinder pressure change slope; when the pressure change slope of the virtual master cylinder reduces the target slope value, multiplying the target value according to a preset mode; when the accumulated value of the counter is equal to or smaller than a preset counting threshold value, recording the current moment as a second moment; and obtaining the maximum value and the minimum value of the vacuum degree signal in the first time to the second time.
In this embodiment, the target slope value, the target numerical value, and the preset count threshold may all be set in a calibrated manner according to the characteristics of the actual vehicle. When it is determined that the slope of the virtual master cylinder pressure change meets the preset condition that the effective brake pedal release occurs, a counter is started, the counter starts counting from zero, in the effective brake pedal release process, each time the slope of the virtual master cylinder pressure change reduces a target slope value, the target value is multiplied according to a preset mode, the counter is made to accumulate the corresponding target value, when the accumulated value of the counter is equal to or smaller than a preset counting threshold value, the current moment is recorded as a second moment, and the maximum value and the minimum value of the vacuum pressure in the range from the initial moment of effectively stepping on the brake pedal to the second moment are recorded.
As an example, the target slope value takes 12.5bar/s (calibratable), the target value is multiplied by 0.5 (calibratable), the maximum value of the target value takes 7.5 (calibratable), and the preset count threshold takes 15 (calibratable). When the change slope of the virtual master cylinder pressure change slope is equal to or smaller than-12.5 bar/s, judging that the brake pedal is effectively released, and adding 0.5 to the counter; when the change slope of the virtual master cylinder pressure change slope is equal to or smaller than-25 bar/s, judging that the brake pedal is effectively released, and adding 1 to a counter; when the change slope of the virtual master cylinder pressure change slope is equal to or smaller than-37.5 bar/s, the brake pedal is judged to be effectively released, a counter is added by 1.5, and the like, the counter is added once in a 10ms operation period, the counter is added by 7.5 at maximum in one operation period, and when the counter is added to 15, the current moment is recorded as the second moment. It should be noted that, in the process of accumulating the counter, if the change slope of the pressure change slope of the virtual master cylinder is equal to or greater than 0 and less than-12.5 bar/s, the counter value is unchanged, and neither increases nor decreases; if the change slope of the virtual master cylinder pressure change slope is larger than 0 before the counter accumulates the numerical value to 15, namely, the brake pedal is depressed, the counter is cleared, and accumulation is restarted.
S15: and judging the clamping stagnation condition of the vacuum degree signal according to the difference value of the maximum value and the minimum value.
In step S15, the difference between the maximum value and the minimum value of the vacuum pressure can be used to represent the maximum variation range of the vacuum level signal detected by the vacuum level sensor from the occurrence of an effective depression of the brake pedal to the occurrence of an effective brake pedal.
In this embodiment, by comparing the maximum variation range of the vacuum degree signal with a preset vacuum variation threshold, it is possible to determine whether or not the vacuum degree signal has a stuck fault.
As an embodiment of the present application, the determining the stuck condition of the vacuum degree signal according to the difference between the maximum value and the minimum value includes: when the difference value between the maximum value and the minimum value is equal to or smaller than a preset vacuum change threshold value, judging that the vacuum degree signal has clamping stagnation; and when the difference value between the maximum value and the minimum value is larger than the preset vacuum change threshold value, judging that the vacuum degree signal has no clamping stagnation.
In this embodiment, if the maximum variation range of the vacuum degree signal is equal to or smaller than the preset vacuum variation threshold, it is determined that the vacuum degree signal has a clamping stagnation; and if the maximum variation range of the vacuum degree signal is larger than the preset vacuum variation threshold, judging that the vacuum degree signal has no clamping stagnation, wherein the preset vacuum variation threshold can be set in a calibrated mode according to the characteristics of an actual vehicle, for example, the preset vacuum variation threshold can be 5mbar, and when the maximum variation range of the vacuum degree signal is equal to or smaller than 5mbar, judging that the vacuum degree signal has clamping stagnation. By judging the clamping situation of the vacuum degree signal according to the difference value of the maximum value and the minimum value of the vacuum pressure, the accuracy of the vacuum degree signal clamping fault detection can be improved.
According to the embodiment of the application, the depth signal and the vacuum degree signal of the brake pedal are read for logic control, the influence of working conditions is avoided, the clamping stagnation fault of the vacuum degree signal can be timely and accurately detected, and the phenomenon that the braking hardness is caused by insufficient vacuum and the driving safety is influenced due to incapability of accurately and timely controlling the operation of the electronic vacuum pump is prevented. Meanwhile, the scheme does not need a master cylinder pressure signal as verification, is suitable for vehicle types without master cylinder pressure signals, and has an expanded application range.
In another embodiment of the present application, when the vacuum degree signal jamming fault is detected by the method for detecting the jamming fault of the vacuum degree signal, the control device may perform open loop control on the electronic vacuum pump, control the electronic vacuum pump to be turned off for a period of time, and turn on for a period of time, so as to ensure that the braking system can provide enough assistance and ensure driving safety. The electronic vacuum pump is controlled to be turned off or on for a period of time, for example, 5s can be taken, and the electronic vacuum pump is controlled to be turned off for 5s and turned on for 5s to be cycled.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present application.
In one embodiment, a vacuum level signal stuck fault detection apparatus 200 is provided, where the vacuum level signal stuck fault detection apparatus corresponds to the vacuum level signal stuck fault detection method in the above embodiment one by one. As shown in fig. 2, the apparatus for detecting a stuck fault of a vacuum signal includes a first judging module 201, a second judging module 202, a third judging module 203, an obtaining module 204, and a fault judging module 205. The functional modules are described in detail as follows:
the first judging module 201: for determining whether an effective depression of the brake pedal has occurred;
the second judging module 202: if the brake pedal is effectively stepped, judging whether the brake pedal is continuously braked;
third judging module 203: for judging whether or not effective release of the brake pedal occurs if it is judged that the braking is continued;
acquisition module 204: the method comprises the steps of obtaining a maximum value and a minimum value of vacuum pressure in the process from the effective stepping of the brake pedal to the effective release of the brake pedal if the effective release of the brake pedal occurs;
the fault determination module 205: and the clamping stagnation condition of the vacuum degree signal is judged according to the difference value of the maximum value and the minimum value.
The fault judging module is further used for:
when the difference value between the maximum value and the minimum value is equal to or smaller than a preset vacuum change threshold value, judging that the vacuum degree signal has clamping stagnation;
and when the difference value between the maximum value and the minimum value is larger than the preset vacuum change threshold value, judging that the vacuum degree signal has no clamping stagnation.
The third judging module is further configured to:
acquiring a corresponding relation between a target pedal opening of the brake pedal and virtual master cylinder pressure; the corresponding relation is obtained by calibrating the actual pedal opening change acquisition data and the actual master cylinder pressure change acquisition data corresponding to at least one test real vehicle;
determining a virtual master cylinder pressure change slope based on the correspondence and a target pedal opening change of the brake pedal;
and when the pressure change slope of the virtual master cylinder meets a preset condition, judging that the brake pedal is effectively released.
After the first judging module, the detecting device is further configured to: if the effective tread of the brake pedal occurs, recording the initial moment of the effective tread of the brake pedal as a first moment;
the acquisition module is further configured to:
in the process of effectively releasing the brake pedal, a counter is made to accumulate corresponding target values based on the slope of the virtual master cylinder pressure change; when the pressure change slope of the virtual master cylinder reduces the target slope value, multiplying the target value according to a preset mode;
when the accumulated value of the counter is equal to or smaller than a preset counting threshold value, recording the current moment as a second moment;
and obtaining the maximum value and the minimum value of the vacuum degree signal in the first time to the second time.
The first judging module is further configured to:
and if the target pedal opening of the brake pedal is detected to be equal to or larger than a first opening threshold value, and the target pedal opening rate corresponding to the target pedal opening is detected to be equal to or larger than a preset rate threshold value, judging that effective pedal pressing of the brake pedal occurs.
The second judging module is further configured to:
monitoring the opening of the target pedal in real time, and judging that the brake is continuously applied if the opening of the target pedal is continuously equal to or greater than a second opening threshold value;
if the target pedal opening is smaller than the second opening threshold, the detection process is exited, and after a preset time period is paused, the target pedal opening is re-detected, and whether the brake pedal is effectively stepped is judged.
For specific limitation of the vacuum degree signal jamming fault detection device, reference may be made to the limitation of the vacuum degree signal jamming fault detection method hereinabove, and the description thereof will not be repeated here. All or part of each module in the vacuum degree signal clamping stagnation fault detection device can be realized by software, hardware and a combination thereof. The above modules may be embedded in hardware or independent of a processor in the control system, or may be stored in software in a memory in the control system, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a control system is provided, which includes the device for detecting the stuck fault of the vacuum signal, and the internal structure diagram of the device may be shown in fig. 3. The control system comprises a processor, a memory and a network interface which are connected through a system bus. Wherein the processor of the control system is configured to provide computing and control capabilities. The memory of the control system comprises a readable storage medium and an internal memory. The non-volatile storage medium stores an operating system and computer readable instructions. The internal memory provides an environment for the execution of an operating system and computer-readable instructions in a readable storage medium. The network interface of the control system is used for communicating with an external control device through a network connection. The computer readable instructions, when executed by the processor, implement a method for detecting stuck faults in a vacuum signal. The readable storage medium provided by the present embodiment includes a nonvolatile readable storage medium and a volatile readable storage medium.
In one embodiment, a control system is provided that includes a memory, a processor, and computer readable instructions stored on the memory and executable on the processor, when executing the computer readable instructions, implementing a method for detecting vacuum signal stuck faults:
judging whether effective stepping on the brake pedal occurs or not;
if the brake pedal is effectively stepped, judging whether the brake pedal is continuously braked;
if the brake is continuously braked, judging whether the brake pedal is effectively released or not;
if the brake pedal is effectively released, obtaining the maximum value and the minimum value of the vacuum pressure in the process from the effective stepping on of the brake pedal to the effective releasing of the brake pedal;
and judging the clamping stagnation condition of the vacuum degree signal according to the difference value of the maximum value and the minimum value.
Or the processing method for realizing the vacuum degree signal jamming fault comprises the following steps:
when the vacuum degree signal is detected to have the clamping stagnation fault by the detection method of the clamping stagnation fault of the vacuum degree signal, the electronic vacuum pump is subjected to open-loop control.
In one embodiment, one or more computer-readable storage media are provided having computer-readable instructions stored thereon, the readable storage media provided by the present embodiment including non-volatile readable storage media and volatile readable storage media. The readable storage medium has stored thereon computer readable instructions that when executed by one or more processors implement a method of detecting vacuum level signal stuck faults:
judging whether effective stepping on the brake pedal occurs or not;
if the brake pedal is effectively stepped, judging whether the brake pedal is continuously braked;
if the brake is continuously braked, judging whether the brake pedal is effectively released or not;
if the brake pedal is effectively released, obtaining the maximum value and the minimum value of the vacuum pressure in the process from the effective stepping on of the brake pedal to the effective releasing of the brake pedal;
and judging the clamping stagnation condition of the vacuum degree signal according to the difference value of the maximum value and the minimum value.
Or the processing method for realizing the vacuum degree signal jamming fault comprises the following steps:
when the vacuum degree signal is detected to have the clamping stagnation fault by the detection method of the clamping stagnation fault of the vacuum degree signal, the electronic vacuum pump is subjected to open-loop control.
Those skilled in the art will appreciate that implementing all or part of the above described embodiment methods may be accomplished by instructing the associated hardware by computer readable instructions stored on a non-volatile readable storage medium or a volatile readable storage medium, which when executed may comprise the above described embodiment methods. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (9)
1. The method for detecting the stuck fault of the vacuum degree signal is characterized by comprising the following steps of:
judging whether effective stepping on the brake pedal occurs or not;
if the brake pedal is effectively stepped, judging whether the brake pedal is continuously braked;
if the brake is continuously braked, judging whether the brake pedal is effectively released or not;
if the brake pedal is effectively released, recording the initial moment of effectively stepping on the brake pedal as a first moment;
in the process of effectively releasing the brake pedal, the counter is made to accumulate corresponding target values based on the pressure change slope of the virtual master cylinder; when the pressure change slope of the virtual master cylinder reduces the target slope value, multiplying the target value according to a preset mode;
when the accumulated value of the counter is equal to or smaller than a preset counting threshold value, recording the current moment as a second moment;
obtaining a maximum value and a minimum value of vacuum pressure in the first time to the second time in the process from the effective stepping of the brake pedal to the effective releasing of the brake pedal;
and judging the clamping stagnation condition of the vacuum degree signal according to the difference value of the maximum value and the minimum value.
2. The method for detecting a stuck fault of a vacuum signal according to claim 1, wherein said determining a stuck condition of the vacuum signal based on a difference between said maximum value and said minimum value comprises:
when the difference value between the maximum value and the minimum value is equal to or smaller than a preset vacuum change threshold value, judging that the vacuum degree signal has clamping stagnation;
and when the difference value between the maximum value and the minimum value is larger than the preset vacuum change threshold value, judging that the vacuum degree signal has no clamping stagnation.
3. The method for detecting a stuck fault in a vacuum signal as claimed in claim 1, wherein said determining whether an effective brake pedal release has occurred comprises:
acquiring a corresponding relation between a target pedal opening of the brake pedal and virtual master cylinder pressure; the corresponding relation is obtained by calibrating the actual pedal opening change acquisition data and the actual master cylinder pressure change acquisition data corresponding to at least one test real vehicle;
determining a virtual master cylinder pressure change slope based on the correspondence and a target pedal opening change of the brake pedal;
and when the pressure change slope of the virtual master cylinder meets a preset condition, judging that the brake pedal is effectively released.
4. The method for detecting a stuck fault of a vacuum signal according to claim 1, wherein said determining whether effective depression of a brake pedal has occurred comprises:
and if the target pedal opening of the brake pedal is detected to be equal to or larger than a first opening threshold value, and the target pedal opening rate corresponding to the target pedal opening is detected to be equal to or larger than a preset rate threshold value, judging that effective pedal pressing of the brake pedal occurs.
5. The method of claim 4, wherein the determining whether the brake is a continuous brake comprises:
monitoring the opening of the target pedal in real time, and judging that the brake is continuously applied if the opening of the target pedal is continuously equal to or greater than a second opening threshold value;
if the target pedal opening is smaller than the second opening threshold, the detection process is exited, and after a preset time period is paused, the target pedal opening is re-detected, and whether the brake pedal is effectively stepped is judged.
6. The method for processing the vacuum degree signal jamming fault is characterized by comprising the following steps of:
when the stuck fault of the vacuum degree signal is detected by the detection method of the stuck fault of the vacuum degree signal according to any one of claims 1 to 5, the electronic vacuum pump is subjected to open-loop control.
7. A vacuum level signal stuck fault detection device, the detection device comprising:
a first judging module: for determining whether an effective depression of the brake pedal has occurred;
and a second judging module: if the brake pedal is effectively stepped, judging whether the brake pedal is continuously braked;
and a third judging module: for judging whether or not effective release of the brake pedal occurs if it is judged that the braking is continued;
the acquisition module is used for: if the brake pedal is effectively released, recording the initial moment of effectively stepping on the brake pedal as a first moment;
in the process of effectively releasing the brake pedal, the counter is made to accumulate corresponding target values based on the pressure change slope of the virtual master cylinder; when the pressure change slope of the virtual master cylinder reduces the target slope value, multiplying the target value according to a preset mode;
when the accumulated value of the counter is equal to or smaller than a preset counting threshold value, recording the current moment as a second moment;
obtaining a maximum value and a minimum value of vacuum pressure in the first time to the second time in the process from the effective stepping of the brake pedal to the effective releasing of the brake pedal;
and a fault judging module: and the clamping stagnation condition of the vacuum degree signal is judged according to the difference value of the maximum value and the minimum value.
8. A control system comprising a memory, a processor, and computer readable instructions stored in the memory and executable on the processor, wherein the computer readable instructions when executed by the processor implement the method of detecting a stuck vacuum signal fault as claimed in any one of claims 1 to 5 or the method of handling a stuck vacuum signal fault as claimed in claim 6.
9. One or more readable storage media storing computer readable instructions that, when executed by a processor, implement the method of detecting a stuck vacuum signal fault or the method of handling a stuck vacuum signal fault of claim 6.
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| CN115257670B (en) * | 2022-08-30 | 2023-08-11 | 麦格纳动力总成(江西)有限公司 | Brake pressure control method and device for IPB brake system |
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