CN115214593A - Jamming fault detection method, jamming fault detection device, jamming fault processing method, control system and medium - Google Patents
Jamming fault detection method, jamming fault detection device, jamming fault processing method, control system and medium Download PDFInfo
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- CN115214593A CN115214593A CN202210852949.9A CN202210852949A CN115214593A CN 115214593 A CN115214593 A CN 115214593A CN 202210852949 A CN202210852949 A CN 202210852949A CN 115214593 A CN115214593 A CN 115214593A
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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
Abstract
The application relates to the technical field of automobiles, and provides a method and a device for detecting vacuum degree signal clamping stagnation faults and a fault processing method, wherein the method comprises the following steps: judging whether effective treading of a brake pedal occurs or not; if the brake pedal is effectively trodden, judging whether the brake is continuously braked; if the brake is determined to be continuously braked, judging whether effective release of a brake pedal occurs or not; if the brake pedal is effectively released, acquiring the maximum value and the minimum value of vacuum pressure in the process from the effective stepping of the brake pedal to the effective release 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. Logic control is carried out by reading a brake pedal signal, a vacuum degree signal and the like, the clamping stagnation fault of the vacuum degree signal can be detected in time, and the phenomenon that braking is hard and driving safety is affected due to the fact that the electronic vacuum pump cannot be accurately and timely controlled to work and the fact that the vacuum is insufficient 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 detection device, a fault processing method, a control system and a readable storage medium.
Background
With the continuous increase of new energy automobile models, the safety of new energy automobiles is also gradually emphasized. The brake power assisting system of the new energy automobile adopts the electronic vacuum pump as a unique vacuum source, the electronic vacuum pump is mainly controlled by a real-time vacuum degree signal provided by a vacuum degree sensor, the accuracy of the vacuum degree signal is related to whether the brake system can accurately and timely control the electronic vacuum pump to work, and sufficient power is provided to ensure the driving safety. If the vacuum degree signal has a clamping stagnation fault (the vacuum degree signal does not change along with the change of the pressure in the electronic vacuum pump), the control device can not accurately control the electronic vacuum pump to work so as to supplement vacuum in time, so that the brake pedal is hard, the vehicle can not be stopped, and the driving safety can not be guaranteed.
Disclosure of Invention
Therefore, in order to solve the technical problems, it is necessary to provide a method, a device, a method, a control system and a storage medium for detecting a vacuum degree signal clamping stagnation fault so as to solve the problem that the existing new energy automobile may lack driving safety guarantee.
A first aspect of an embodiment of the present application provides a method for detecting a vacuum degree signal jamming fault, including:
judging whether effective treading of a brake pedal occurs or not;
if the brake pedal is effectively trodden, judging whether the brake is continuously braked;
if the brake is determined to be continuously braked, judging whether effective release of a brake pedal occurs or not;
if the brake pedal is effectively released, acquiring the maximum value and the minimum value of vacuum pressure in the process from the effective stepping of the brake pedal to the effective release 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 embodiments of the present application provides a method for processing a vacuum degree signal clamping stagnation fault, including:
when the vacuum degree signal clamping stagnation fault is detected 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 embodiments of the present application provides a vacuum degree signal jamming fault detection apparatus, including:
a first judging module: the device is used for judging whether effective treading on the brake pedal occurs or not;
a second judging module: the brake pedal is used for judging whether the brake is continuously braked or not if the brake pedal is effectively trodden;
a third judging module: the brake pedal release judging module is used for judging whether effective brake pedal release occurs or not if the brake is judged to be continuously braked;
an acquisition module: the device is used for acquiring the maximum value and the minimum value of vacuum pressure in the process from effective treading of the brake pedal to effective release of the brake pedal if the effective release of the brake pedal occurs;
a fault judgment 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 an 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 degree signal jamming fault or the method for processing the vacuum degree signal jamming fault when executing the computer readable instructions.
A fifth aspect of embodiments of the present application provides one or more readable storage media having computer-readable instructions stored thereon, which, when executed by one or more processors, cause the one or more processors to perform a method of detecting or a method of processing a vacuum level signal stuck fault as described above.
The embodiment of the application provides a method for detecting a vacuum degree signal clamping stagnation fault, when a brake pedal signal changes due to stepping on or releasing of the brake pedal, the pressure of an electronic vacuum pump changes accordingly, and a vacuum degree signal output by a vacuum degree sensor also changes accordingly, wherein the change of the vacuum degree signal can be reflected by the value of vacuum pressure. According to the scheme, the brake pedal signal, the vacuum degree signal and the like are read for logic control, the vacuum degree signal clamping stagnation fault can be detected in time, and the phenomenon that the driving safety is influenced due to hard braking caused by insufficient vacuum caused by the fact that the electronic vacuum pump cannot be accurately and timely controlled to work is prevented.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the description of the embodiments of the present application will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings may be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic flow chart illustrating an implementation of a vacuum signal stuck fault detection method in an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a device for detecting a vacuum signal jamming fault in an embodiment of the present application;
fig. 3 is a schematic diagram of a control system in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that in the description of the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
The detection method and the fault processing method for the vacuum degree signal clamping stagnation fault can be applied to vehicles comprising a control system and master cylinder pressure signals or not, the control system executes reading of brake pedal signals, vacuum degree signals and the like, logic control is conducted through the read signals, whether the vacuum degree signals have the clamping stagnation fault or not is judged, and if the vacuum degree signals are detected to have the clamping stagnation fault, a fault processing mode can be started, so that the brake system can provide enough assistance, and driving safety is guaranteed.
Referring to fig. 1, fig. 1 is a flowchart illustrating an implementation of a method for detecting a vacuum degree signal clamping failure in an embodiment of the present application, including the following steps:
s11: and judging whether effective treading on the brake pedal occurs.
In step S11, when the pedal opening of the brake pedal meets a preset condition, the brake pedal is effectively stepped, otherwise, after a preset time period is suspended, the detection of the vacuum degree signal jamming fault is restarted, where the preset time period may be calibrated, for example, 200ms or the like.
In this embodiment, if the pedal opening of the brake pedal is smaller, so that the vacuum degree change is smaller, the vacuum degree change possibly corresponding to the difference value between the maximum value and the minimum value of the finally detected vacuum pressure is confused, and it cannot be judged whether the vacuum degree change caused by the smaller pedal opening is small or the vacuum degree change caused by the vacuum degree signal clamping failure is small, so that the detection accuracy of the vacuum degree signal clamping failure is ensured, the pedal opening of the brake pedal is controlled to meet the preset condition, namely, the pedal is effectively trodden on the premise. In other embodiments, if the vacuum degree signal (vacuum pressure) is read to be greater than the low vacuum alarm threshold value, that is, the vacuum degree is low, it is not determined whether the brake pedal is effectively stepped, but the low vacuum alarm is directly performed, and the detection process is stopped.
As an embodiment of the present application, the determining whether effective stepping on the brake pedal occurs includes: and if the target pedal opening degree of the brake pedal is detected to be equal to or larger than a first opening degree threshold value, and the target pedal opening degree speed corresponding to the target pedal opening degree is detected to be equal to or larger than a preset speed threshold value, judging that the brake pedal is effectively trodden.
In this embodiment, the preset condition may be that a target pedal opening of the brake pedal is equal to or greater than a first opening threshold, and a 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 a brake pedal stroke change to a total brake pedal stroke, and both the first opening threshold and the preset rate threshold may be calibrated and set according to a characteristic of the vehicle itself, and as an example, the first opening threshold may be 10.5% or the like, and the preset rate threshold may be 24%/s or the like. In one embodiment, when the target pedal opening of the brake pedal is continuously equal to or greater than the first opening threshold value and the target pedal opening rate is continuously equal to or greater than the preset rate threshold value within a preset time period, it is determined that effective pedaling of the brake pedal occurs, wherein the preset time period can be calibrated, for example, 15 to 30 calculation cycles can be adopted, and each calculation cycle can be 10ms. Otherwise, if either the target pedal opening or the target pedal opening rate does not meet the above condition, suspending the detection of the vacuum degree signal clamping stagnation fault, and restarting the detection of the vacuum degree signal clamping stagnation fault after a preset time length, wherein the preset time length can be calibrated, for example, 200ms and the like. The effectiveness of the stepping behavior of the brake pedal is ensured through dual redundancy of the brake pedal opening degree change signal and the brake pedal opening rate change signal.
S12: if the brake pedal is effectively trodden, judging whether the brake is continuously braked;
in this embodiment, the brake boosting system uses the electronic vacuum pump as the only vacuum source, and the electronic vacuum pump is mainly controlled by the real-time vacuum signal provided by the vacuum sensor, so that the vacuum signal jamming fault needs to be detected and is guaranteed to be performed in the environment of continuous braking.
As an embodiment of the present application, the determining whether the braking is the continuous braking includes:
monitoring the opening degree of the target pedal in real time, and if the opening degree of the target pedal is continuously equal to or greater than a second opening degree threshold value, judging that the braking is continuously performed;
if the target pedal opening is smaller than the second opening threshold, exiting the detection process, detecting the target pedal opening again after pausing for a preset time period, and judging whether the brake pedal is effectively trodden.
In the present embodiment, the condition of continuous braking includes that the target pedal opening is continuously equal to or greater than a second opening threshold, wherein the second opening threshold may be set in a calibration manner according to the characteristics of the vehicle itself, for example, 10% may be taken. In other embodiments, the condition of sustained braking may further include the brake light switch being in an on state. If the continuous braking is not established, that is, the target pedal opening is smaller than the second opening threshold, exiting the detection logic, and restarting the detection of the vacuum degree signal clamping failure after pausing the preset time period, and performing the process of the step S11 again, wherein the preset time period may also be calibrated, for example, 200ms may be taken.
S13: if the brake is determined to be continuously braked, judging whether effective release of a brake pedal occurs 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 under continuous braking, it is further determined whether effective release of the brake pedal occurs.
As an embodiment of the present application, the determining whether effective release of the brake pedal occurs includes: acquiring a corresponding relation between the target pedal opening of the brake pedal and the virtual master cylinder pressure; the corresponding relation is obtained by calibrating actual pedal opening change acquisition data and actual main cylinder pressure change acquisition data corresponding to at least one test actual vehicle; determining a virtual master cylinder pressure change slope based on the corresponding relation and the 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, in consideration of the fact that the detection scheme of the vacuum degree signal sticking fault can be applied to the vehicle without the master cylinder pressure, the embodiment infers the corresponding relationship between the actual pedal opening change collected data and the actual master cylinder pressure change collected data through the actual pedal opening change collected data and the actual master cylinder pressure change collected data corresponding to at least one test real vehicle, and the corresponding relationship is also applied to the target brake pedal opening and the virtual master cylinder pressure. As an example, the correspondence relationship between the target brake pedal opening degree and the virtual master cylinder pressure is shown in table 1 below, and it can be seen that the virtual master cylinder pressure and the target pedal opening degree change in a positive correlation, and when the brake pedal is depressed, the virtual master cylinder pressure increases with an increase in the target pedal opening degree, and when the brake pedal is released, the virtual master cylinder pressure decreases with a smaller target pedal opening degree.
| Target pedal opening (%) | 0 | …… | …… | 100 |
| Virtual master cylinder pressure (bar) | 0 | …… | …… | 92 |
TABLE 1
After the corresponding relation between the target brake pedal opening degree and the virtual master cylinder pressure is obtained, for a vehicle without a master cylinder pressure signal, the change of the virtual master cylinder pressure can be estimated only according to the target brake pedal opening degree change of the brake pedal. When the pressure change slope of the virtual master cylinder meets the preset condition and the opening degree of the target brake pedal meets the condition of continuous braking, the effective release of the brake pedal can be judged to occur. The preset condition includes, but is not limited to, when the virtual master cylinder pressure change slope is equal to or smaller than a preset slope threshold, it is determined that effective release of the brake pedal occurs, the preset slope threshold is a negative value, and specific values can be calibrated and set according to actual vehicle characteristics, for example, the preset slope threshold can be-12.5 bar/s. The detection scheme of the vacuum degree signal clamping stagnation fault does not need a master cylinder pressure signal as a check, so that the method is suitable for vehicles without the master cylinder pressure signal, such as ESP (electronic stability program) configured vehicles and ABS (anti-lock braking system) configured vehicles, the application range is expanded, and the development cost is saved.
S14: if the brake pedal is effectively released, acquiring the maximum value and the minimum value of vacuum pressure in the process from the effective stepping of the brake pedal to the effective release 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 from the time when it is determined in step S11 that effective depression of the brake pedal occurs to the time when it is determined in step S14 that effective release of the brake pedal occurs. And judging whether the vacuum degree signal has the clamping stagnation fault, namely judging whether the maximum variation range of the vacuum pressure reaches an expected threshold range, and if not, judging that the vacuum degree signal has the clamping stagnation fault.
As an embodiment of the present application, after determining whether effective pedaling of the brake pedal occurs, the method further includes: if the brake pedal is effectively trodden, recording the initial moment of effectively trodden the brake pedal as a first moment;
the obtaining of the maximum value and the minimum value of the vacuum pressure in the process from the occurrence of effective stepping on the brake pedal to the occurrence of effective releasing the brake pedal comprises the following steps: enabling a counter to accumulate corresponding target values based on the virtual master cylinder pressure change slope; when the virtual master cylinder pressure change slope is reduced by a target slope value, multiplying the target value in 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 acquiring the maximum value and the minimum value of the vacuum degree signal from the first time to the second time.
In this embodiment, the target slope value, the target value, and the preset counting threshold value may be calibrated according to the characteristics of the actual vehicle. When the change slope of the virtual master cylinder pressure is determined to meet the preset condition of effectively releasing the brake pedal, a counter is started, the counter starts counting from zero, in the process of effectively releasing the brake pedal, when the change slope of the virtual master cylinder pressure is reduced by a target slope value, the target value is multiplied according to a preset mode, the counter accumulates 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 at the moment, the maximum value and the minimum value of the vacuum pressure from the initial moment of effectively treading the brake pedal to the second moment are recorded.
As an example, the target slope value is 12.5bar/s (calibratable), the target value is multiplied by 0.5 (calibratable), the maximum value of the target value is 7.5 (calibratable), and the preset count threshold is 15 (calibratable). When the change slope of the virtual master cylinder pressure is equal to or less than-12.5 bar/s, the brake pedal is judged to be effectively released, and the counter is increased by 0.5; when the change slope of the virtual master cylinder pressure is equal to or less 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 is equal to or less than-37.5 bar/s, the brake pedal is judged to be effectively released, the counter is added by 1.5, and the like, 10ms is taken as an operation period, the counter is added once, the operation period is one, the maximum value of the counter is added by 7.5, and when the accumulated value of the counter reaches 15, the current time is recorded as a second time. It should be noted that, in the accumulation process of the counter, if the change slope of the virtual master cylinder pressure is equal to or greater than 0 and less than-12.5 bar/s, the value of the counter is not changed, and is neither increased nor decreased; if the change slope of the virtual master cylinder pressure is larger than 0 before the counter accumulates the value to 15, namely the brake pedal is stepped, 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 of the vacuum pressure and the minimum value can be used to indicate the maximum variation range of the vacuum level signal detected by the vacuum level sensor from the occurrence of active depression of the brake pedal to the occurrence of active brake pedal.
In this embodiment, by comparing the maximum variation range of the vacuum signal with the preset vacuum variation threshold, it can be determined whether the vacuum signal has a stuck fault.
As an embodiment of the present application, the determining the clamping stagnation 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, determining that the vacuum degree signal is blocked; 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 is not blocked.
In this embodiment, if the maximum variation range of the vacuum degree signal is equal to or smaller than a preset vacuum variation threshold, it is determined that the vacuum degree signal is stuck; and if the maximum variation range of the vacuum degree signal is larger than the preset vacuum variation threshold value, determining that the vacuum degree signal does not have clamping stagnation, wherein the preset vacuum variation threshold value can be calibrated and set according to the self characteristics of the actual vehicle, for example, the preset vacuum variation threshold value can be 5mbar, and when the maximum variation range of the vacuum degree signal is equal to or smaller than 5mbar, determining that the vacuum degree signal has clamping stagnation. The clamping stagnation condition of the vacuum degree signal is judged according to the difference value of the maximum value and the minimum value of the vacuum pressure, so that the clamping stagnation fault detection accuracy of the vacuum degree signal can be improved.
The embodiment of the application carries out logic control through reading brake pedal's degree of depth signal and vacuum signal, does not receive the operating mode influence, can in time accurately detect vacuum signal jamming trouble, prevents to send out hard because of the unable accurate timely control electron vacuum pump work to the braking that leads to the not enough arouse in vacuum influences driving safety's phenomenon. Meanwhile, the scheme does not need a master cylinder pressure signal as a check, is suitable for vehicles without master cylinder pressure signals, and has an expanded application range.
As another embodiment of the application, when the vacuum signal clamping stagnation fault is detected by the detection method of the vacuum signal clamping stagnation fault, the control device can perform open-loop control on the electronic vacuum pump, control the electronic vacuum pump to be closed for a period of time and be opened for a period of time, and perform cyclic reciprocation, so that the brake system can provide enough assistance, and the driving safety is ensured. The period of time for controlling the electronic vacuum pump to be switched off or switched on can be calibrated, for example, 5s can be taken, and the electronic vacuum pump is controlled to be switched off for 5s, switched on for 5s and cycled.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
In one embodiment, a device 200 for detecting a vacuum degree signal clamping failure is provided, and the device for detecting a vacuum degree signal clamping failure corresponds to the method for detecting a vacuum degree signal clamping failure in the above embodiment one to one. As shown in fig. 2, the apparatus for detecting the vacuum degree signal clamping failure includes a first determining module 201, a second determining module 202, a third determining module 203, an obtaining module 204, and a failure determining module 205. The detailed description of each functional module is as follows:
the first determining module 201: the device is used for judging whether effective treading on the brake pedal occurs or not;
the second determination module 202: the brake pedal is used for judging whether the brake is continuously braked or not if the brake pedal is effectively trodden;
the third judging module 203: the brake pedal release judging module is used for judging whether effective brake pedal release occurs or not if the brake is judged to be continuously braked;
the acquisition module 204: the device is used for acquiring the maximum value and the minimum value of vacuum pressure in the process from effective treading of the brake pedal to 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 judgment module is further configured to:
when the difference value between the maximum value and the minimum value is equal to or smaller than a preset vacuum change threshold value, determining that the vacuum degree signal is blocked;
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 is not blocked.
The third judging module is further configured to:
acquiring a corresponding relation between the target pedal opening of the brake pedal and the virtual master cylinder pressure; the corresponding relation is obtained by calibrating actual pedal opening change acquisition data and actual main cylinder pressure change acquisition data corresponding to at least one test actual vehicle;
determining a virtual master cylinder pressure change slope based on the corresponding relation and the 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 determining module, the detecting device is further configured to: if the brake pedal is effectively trodden, recording the initial moment of effectively trodden 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 a corresponding target value based on the virtual master cylinder pressure change slope; when the virtual master cylinder pressure change slope is reduced by a target slope value, multiplying the target value in 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 acquiring the maximum value and the minimum value of the vacuum degree signal from the first time to the second time.
The first judging module is further configured to:
and if the target pedal opening degree of the brake pedal is detected to be equal to or larger than a first opening degree threshold value, and the target pedal opening degree speed corresponding to the target pedal opening degree is detected to be equal to or larger than a preset speed threshold value, judging that the brake pedal is effectively trodden.
The second judging module is further configured to:
monitoring the opening degree of the target pedal in real time, and if the opening degree of the target pedal is continuously equal to or greater than a second opening degree threshold value, judging that the braking is continuously performed;
if the target pedal opening degree is smaller than the second opening degree threshold value, the detection process is quitted, the target pedal opening degree is detected again after the pause of a preset time period, and whether the brake pedal is effectively stepped is judged.
For the specific limitation of the detection device for the vacuum degree signal clamping failure, reference may be made to the above limitation on the detection method for the vacuum degree signal clamping failure, and details are not described here. All or part of each module in the device for detecting the vacuum degree signal clamping stagnation fault can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the control system, and can also be stored in a memory in the control system in a software form, so that the processor can call and execute the corresponding operations of the modules.
In one embodiment, a control system is provided, which comprises the above mentioned vacuum degree signal jamming fault detection device, and the internal structure diagram can 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 computational 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 operating system and execution of computer-readable instructions in the readable storage medium. The network interface of the control system is used for connecting and communicating with an external control device through a network. The computer readable instructions, when executed by a processor, implement a method for detecting a vacuum level signal stuck fault. The readable storage media provided by the present embodiment include nonvolatile readable storage media and volatile readable storage media.
In one embodiment, a control system is provided, which comprises a memory, a processor and computer readable instructions stored on the memory and executable on the processor, wherein the processor executes the computer readable instructions to implement a method for detecting a vacuum level signal stuck fault:
judging whether effective treading of a brake pedal occurs or not;
if the brake pedal is effectively trodden, judging whether the brake is continuously braked;
if the brake is determined to be continuously braked, judging whether effective release of a brake pedal occurs or not;
if the brake pedal is effectively released, acquiring the maximum value and the minimum value of vacuum pressure in the process from the effective stepping of the brake pedal to the effective release 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 clamping stagnation fault comprises the following steps:
when the vacuum degree signal clamping stagnation fault is detected by the vacuum degree signal clamping stagnation fault detection method, the electronic vacuum pump is subjected to open-loop control.
In one embodiment, one or more computer-readable storage media storing computer-readable instructions are provided, the readable storage media provided by the embodiments 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 a vacuum level signal stuck fault:
judging whether effective treading of a brake pedal occurs or not;
if the brake pedal is effectively trodden, judging whether the brake is continuously braked;
if the brake is determined to be continuously braked, judging whether effective release of a brake pedal occurs or not;
if the brake pedal is effectively released, acquiring the maximum value and the minimum value of vacuum pressure in the process from the effective stepping of the brake pedal to the effective release 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 clamping stagnation fault comprises the following steps:
when the vacuum degree signal clamping stagnation fault is detected by the vacuum degree signal clamping stagnation fault detection method, the electronic vacuum pump is subjected to open-loop control.
It will be understood by those of ordinary skill in the art that all or part of the processes of the methods of the above embodiments may be implemented by hardware related to computer readable instructions, which may be stored in a non-volatile readable storage medium or a volatile readable storage medium, and when executed, the computer readable instructions may include processes of the above embodiments of the methods. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile 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), rambus (Rambus) direct RAM (RDRAM), direct Rambus Dynamic RAM (DRDRAM), and Rambus 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-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A detection method for vacuum degree signal clamping stagnation faults is characterized by comprising the following steps:
judging whether effective treading of a brake pedal occurs or not;
if the brake pedal is effectively stepped, judging whether the brake is continuously braked;
if the brake is determined to be continuously braked, judging whether effective release of a brake pedal occurs or not;
if the brake pedal is effectively released, acquiring the maximum value and the minimum value of vacuum pressure in the process from the effective stepping of the brake pedal to the effective release 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 the vacuum degree signal jamming fault according to claim 1, wherein the determining the vacuum degree signal jamming condition according to the difference value of the maximum value and the 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, determining that the vacuum degree signal is blocked;
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 is not blocked.
3. The method of claim 1, wherein the determining whether an effective release of the brake pedal has occurred comprises:
acquiring a corresponding relation between the target pedal opening of the brake pedal and the virtual master cylinder pressure; the corresponding relation is obtained by calibrating actual pedal opening change acquisition data and actual main cylinder pressure change acquisition data corresponding to at least one test actual vehicle;
determining a virtual master cylinder pressure change slope based on the corresponding relation and the 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 of claim 3, wherein after determining whether a brake pedal is depressed effectively, the method further comprises: if the brake pedal is effectively trodden, recording the initial moment of effectively trodden the brake pedal as a first moment;
the obtaining of the maximum value and the minimum value of the vacuum pressure in the process from the occurrence of effective stepping on the brake pedal to the occurrence of effective releasing the brake pedal comprises the following steps:
in the process of effectively releasing the brake pedal, a counter is made to accumulate a corresponding target value based on the virtual master cylinder pressure change slope; when the virtual master cylinder pressure change slope is reduced by a target slope value, multiplying the target value in 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 acquiring the maximum value and the minimum value of the vacuum degree signal from the first time to the second time.
5. The method of claim 1, wherein the determining whether the brake pedal is effectively depressed comprises:
and if the target pedal opening degree of the brake pedal is detected to be equal to or larger than a first opening degree threshold value, and the target pedal opening degree speed corresponding to the target pedal opening degree is detected to be equal to or larger than a preset speed threshold value, judging that the brake pedal is effectively trodden.
6. The method of claim 5, wherein the determining whether the braking is sustained comprises:
monitoring the opening degree of the target pedal in real time, and if the opening degree of the target pedal is continuously equal to or greater than a second opening degree threshold value, judging that the braking is continuously performed;
if the target pedal opening degree is smaller than the second opening degree threshold value, the detection process is quitted, the target pedal opening degree is detected again after the pause of a preset time period, and whether the brake pedal is effectively stepped is judged.
7. A processing method for vacuum degree signal clamping stagnation faults is characterized by comprising the following steps:
when the vacuum degree signal clamping failure is detected through the vacuum degree signal clamping failure detection method according to any one of claims 1 to 6, the electronic vacuum pump is subjected to open-loop control.
8. A vacuum signal jamming fault detection device, characterized in that, the detection device includes:
a first judgment module: the device is used for judging whether effective treading on the brake pedal occurs or not;
a second judging module: the brake pedal is used for judging whether the brake is continuously braked or not if the brake pedal is effectively trodden;
a third judging module: the brake pedal release judging module is used for judging whether effective brake pedal release occurs or not if the brake is judged to be continuously braked;
an acquisition module: the device is used for acquiring the maximum value and the minimum value of vacuum pressure in the process from effective treading of the brake pedal to effective release of the brake pedal if the effective release of the brake pedal occurs;
a fault judgment 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.
9. 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 vacuum level signal stuck fault of any one of claims 1 to 6 or implement the method of processing vacuum level signal stuck fault of claim 7.
10. One or more readable storage media storing computer readable instructions which, when executed by a processor, implement the method for detecting vacuum signal stuck fault of any one of claims 1-6 or implement the method for processing vacuum signal stuck fault of claim 7.
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