CN114212070A - Fault detection processing method for electric vehicle brake power-assisted system - Google Patents
Fault detection processing method for electric vehicle brake power-assisted system Download PDFInfo
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- CN114212070A CN114212070A CN202111674467.0A CN202111674467A CN114212070A CN 114212070 A CN114212070 A CN 114212070A CN 202111674467 A CN202111674467 A CN 202111674467A CN 114212070 A CN114212070 A CN 114212070A
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- 238000003672 processing method Methods 0.000 title claims abstract description 8
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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
Abstract
The embodiment of the application provides a fault detection processing method for a brake boosting system of an electric vehicle, which comprises the following steps: and acquiring a voltage value of the air pressure sensor, and determining the working state of the air pressure sensor according to the voltage value. The working state includes a normal state and an abnormal state. And determining the fault state of the brake boosting system under the condition that the working state of the air pressure sensor is a normal state. The fault status includes failed and not failed. And determining the fault type of the brake boosting system under the condition that the fault state of the brake boosting system is that the fault occurs. The failure type includes at least a gas leak failure. And under the condition that the fault type of the brake power-assisted system is an air leakage fault, determining the fault level of the brake power-assisted system, and executing the fault processing operation of the brake power-assisted system corresponding to the fault level. By determining the fault level and executing corresponding processing operation according to the fault level, the method has the beneficial effect of improving the accuracy of the vehicle brake power assisting system in fault detection and processing.
Description
Technical Field
The application relates to the technical field of vehicles, in particular to a fault detection processing method for a brake boosting system of an electric vehicle.
Background
With the strong support of national policies, pure electric vehicles are developed rapidly. The existing pure electric automobile adopts air pump control for braking assistance.
In the prior art, when the vehicle control unit finds that the air pressure is lower than a certain set threshold value, the air pump is controlled to start to work; in the working process, the vehicle control unit continuously detects the air pressure, and when the air pressure is higher than a certain set threshold value, the vehicle control unit controls the air pump to stop working.
However, when the brake boosting system fails and the air pressure is not changed, the whole vehicle controller can generate error feedback, so that the whole vehicle controller cannot perform accurate judgment, the vehicle loses brake boosting and cannot perform early warning in time, and driving safety is affected.
Disclosure of Invention
The embodiment of the application provides a fault detection processing method for a brake power-assisting system of an electric vehicle, and aims to solve the problem that in the prior art, the fault of the brake power-assisting system of the vehicle is judged and processed with low accuracy.
In order to solve the above problem, an embodiment of the present application provides a method, including:
acquiring a voltage value of the air pressure sensor;
determining the working state of the air pressure sensor according to the voltage value; the working state comprises a normal state and an abnormal state;
determining the fault state of the brake boosting system under the condition that the working state of the air pressure sensor is a normal state; the fault status includes failed and not failed;
determining the fault type of the brake boosting system under the condition that the fault state of the brake boosting system is that a fault occurs; the fault type includes at least a gas leakage fault;
determining the fault level of the brake boosting system under the condition that the fault type of the brake boosting system is a gas leakage fault;
and executing the brake boosting system fault processing operation corresponding to the fault level.
Optionally, after determining the working state of the air pressure sensor according to the voltage value, the method further includes:
determining a vehicle state under the condition that the working state of the air pressure sensor is an abnormal state; the vehicle state comprises a parking state and a driving state;
and executing a barometric pressure sensor fault handling operation corresponding to the vehicle state.
Optionally, the performing an air pressure sensor fault handling operation corresponding to the vehicle state includes:
executing a failure processing operation that prohibits the vehicle from running in a case where the vehicle is in a stopped state;
executing a fault handling operation that controls the vehicle to enter a limp home mode in a case where the vehicle is in a running state.
Optionally, the determining the working state of the air pressure sensor according to the voltage value includes: determining that the working state of the air pressure sensor is an abnormal state under the condition that the voltage value is greater than a first preset voltage value;
determining that the working state of the air pressure sensor is an abnormal state under the condition that the voltage value is smaller than a second preset voltage value;
and determining that the working state of the air pressure sensor is a normal state under the condition that the voltage value is less than or equal to the first preset voltage and greater than or equal to the second preset voltage value.
Optionally, the determining a fault state of the brake boosting system in the case that the working state of the air pressure sensor is a normal state includes:
acquiring a brake pedal signal within a first preset time and the air pressure reduction quantity of an air tank before and after the first preset time;
and under the condition that the brake pedal signal is not received within the first preset time and the air pressure reduction amount is larger than a first threshold value, determining that the fault state of the brake power assisting system is that a fault occurs.
Optionally, the determining a fault type of the brake boosting system in the case that the brake boosting system has failed comprises:
controlling the air pump to work to obtain the air pressure change condition of the air tank;
and determining the fault type of the brake boosting system to be a gas leakage fault under the condition of the air pressure rise.
Optionally, determining a fault state of the brake boosting system when the working state of the air pressure sensor is a normal state, further includes:
acquiring the continuous working duration of the air pump and a pedal travel value in the working duration;
determining that the fault state of the brake boosting system is that a fault occurs under the conditions that the continuous working time length is longer than a second preset time length and the pedal travel value in the working time length is always 0
Optionally, the determining a fault type of the brake boosting system in the case that the brake boosting system has failed further includes:
controlling the air pump to stop working to obtain the air pressure change condition of the air tank;
and determining the fault type of the brake boosting system as a gas leakage fault under the condition that the air pressure is reduced.
Optionally, the determining a fault level of the brake boosting system in the case that the fault type of the brake boosting system is a gas leakage fault includes:
acquiring the air pressure reduction rate of the air tank in the air pressure reduction process;
determining the fault level of the brake boosting system according to the air pressure reduction rate;
when the air pressure reduction rate is a first preset rate, determining that the fault level of the brake boosting system is a first-level fault;
when the air pressure reduction rate is a second preset rate, determining that the fault level of the brake boosting system is a secondary fault;
and when the air pressure reduction rate is a third preset rate, determining that the fault level of the brake boosting system is a three-level fault.
Optionally, the executing a brake boosting system fault handling operation corresponding to the fault level includes:
executing a first operation under the condition that the fault level of the brake boosting system is a primary fault;
executing a second operation under the condition that the fault level of the brake boosting system is a secondary fault;
and executing a third operation under the condition that the fault level of the brake power assisting system is a three-level fault.
In the embodiment of the application, under the condition that the working state of the air pressure sensor is a normal state, the fault type and the fault level of the brake power assisting system are determined step by step, and after the fault level is determined, corresponding processing operation is executed according to the prestored brake power assisting system fault processing operation corresponding to the fault level. By determining the refined fault level and executing corresponding processing operation according to the fault level, the accuracy of fault identification and fault processing is improved, the driving safety of the vehicle is ensured, and the beneficial effects of improving the accuracy of judgment and processing of the vehicle brake power-assisted system on the fault are achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a flowchart illustrating steps of a method for detecting and processing a fault of a brake boosting system of an electric vehicle according to an embodiment of the present disclosure;
FIG. 2 is a flow chart illustrating steps of another method for detecting and processing a fault in a brake boosting system of an electric vehicle according to an embodiment of the present application;
fig. 3 is a block diagram of a fault detection processing device of an electric vehicle brake boosting 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 appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In various embodiments of the present application, it should be understood that the sequence numbers of the following processes do not mean the 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.
The method provided by the embodiment of the present application is described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
Referring to fig. 1, a method for detecting and processing a fault of an electric vehicle brake boosting system according to an embodiment of the present application is shown, which specifically includes the following steps:
step 101: and acquiring a voltage value of the air pressure sensor.
The brake assisting system fault detection processing method can be used for a pure electric vehicle, the brake assisting system of the pure electric vehicle mainly comprises an air pump, an air cylinder and a pressure sensor, and the brake assisting system is controlled by the air pump. Wherein, above-mentioned vehicle can be pure electric heavy truck. In practical applications, a voltage value of the pressure sensor is obtained through a VCU (pure electric vehicle control unit, hereinafter referred to as VCU).
Step 102: determining the working state of the air pressure sensor according to the voltage value; the working state comprises a normal state and an abnormal state.
Different voltage values of the air pressure sensor correspond to different working states, the working states are different under the condition that the voltage values are different, the VCU acquires the voltage value of the air pressure sensor, and the working state of the air pressure sensor can be determined according to the acquired voltage value. When the working state of the air pressure sensor is a normal state, the air pressure sensor can work normally; when the working state of the air pressure sensor is abnormal, the air pressure sensor fails and cannot work normally. It should be noted that the correspondence between different voltage values and operating states is stored in the VCU in advance.
Step 103: determining the fault state of the brake boosting system under the condition that the working state of the air pressure sensor is a normal state; the fault conditions include failed and non-failed.
And when the working state of the air pressure sensor is a normal state, namely the air pressure sensor can work normally, determining the fault state of the brake boosting system. When the fault state of the brake boosting system is that a fault occurs, the brake boosting system cannot perform brake boosting on the vehicle; when the fault state of the brake boosting system is that no fault occurs, the brake boosting system can perform brake boosting on the vehicle.
Step 104: determining the fault type of the brake boosting system under the condition that the fault state of the brake boosting system is that a fault occurs; the fault type includes at least a gas leak fault.
When the brake boosting system can not perform brake boosting on the vehicle, further, the fault type of the brake boosting system is determined. When the fault type is an air leakage fault, the brake boosting system cannot realize brake boosting on the vehicle. Note that at least the types of failure including the leak failure are stored in the VCU in advance.
Step 105: determining a fault level of the brake boosting system when the fault type of the brake boosting system is a gas leakage fault.
When the brake boosting system has air leakage fault, the fault level is further determined.
Step 106: and executing the brake boosting system fault processing operation corresponding to the fault level.
Different fault levels correspond to different processing operations, and under the condition that the fault levels are different, the fault processing operations executed by the VCUs are different, and the VCUs execute the corresponding processing operations according to the determined fault levels. It should be noted that the correspondence between different failure levels and processing operations is stored in the VCU in advance.
In the embodiment of the application, under the condition that the working state of the air pressure sensor is a normal state, the fault type and the fault level of the brake power assisting system are determined step by step, and after the fault level is determined, corresponding processing operation is executed according to the prestored brake power assisting system fault processing operation corresponding to the fault level. By determining the refined fault level and executing corresponding processing operation according to the fault level, the accuracy of fault identification and fault processing is improved, the driving safety of the vehicle is ensured, and the beneficial effect of improving the accuracy of the vehicle brake power-assisted system in fault detection and processing is achieved.
It should be noted that, in the method, no new device needs to be added to the vehicle, so that the accuracy of judging and processing the fault by the vehicle brake assisting system is improved on the basis of not adding any device, the running safety is enhanced, the cost of the whole vehicle is not increased, and the long-term development of the electric vehicle is facilitated.
Referring to fig. 2, another method for detecting and processing a fault of an electric vehicle brake boosting system according to an embodiment of the present application is shown, which specifically includes the following steps:
optionally, in this embodiment of the application, after determining the operating state of the air pressure sensor according to the voltage value, the method further includes:
step 201: and acquiring a voltage value of the air pressure sensor.
The brake assisting system fault detection processing method can be used for a pure electric vehicle, the brake assisting system of the pure electric vehicle mainly comprises an air pump, an air cylinder and a pressure sensor, and the brake assisting system is controlled by the air pump. Wherein, above-mentioned vehicle can be pure electric heavy truck. In practical applications, a voltage value of the pressure sensor is obtained through a VCU (pure electric vehicle control unit, hereinafter referred to as VCU).
Step 202: determining the working state of the air pressure sensor according to the voltage value; the working state comprises a normal state and an abnormal state.
Different voltage values of the air pressure sensor correspond to different working states, the working states are different under the condition that the voltage values are different, the VCU acquires the voltage value of the air pressure sensor, and the working state of the air pressure sensor can be determined according to the acquired voltage value. When the working state of the air pressure sensor is a normal state, the air pressure sensor can work normally; when the working state of the air pressure sensor is abnormal, the air pressure sensor fails and cannot work normally. It should be noted that the correspondence between different voltage values and operating states is stored in the VCU in advance.
Specifically, different voltage values correspond to different working states of the air pressure sensor, and in practical application, when the voltage value exceeds a first preset voltage value, the working state of the air pressure sensor is determined to be in an abnormal state, and at the moment, the air pressure sensor fails; when the voltage value is lower than a second preset voltage value, determining that the working state of the air pressure sensor is in an abnormal state, and at the moment, the air pressure sensor breaks down; when the voltage value is between the first preset voltage value and the second preset voltage value, the first preset voltage value and the second preset voltage value are included, and at the moment, the air pressure sensor can be normally used without failure.
It should be noted that the magnitude of the preset voltage value is related to the voltage attribute of the air pressure sensor, and the voltages of the air pressure sensors with different specifications are different. The preset voltage value may be the maximum operating voltage of the air pressure sensor, or may be a voltage value artificially set according to specific situations in practical applications, which is not limited in this embodiment.
Step 203: determining the fault state of the brake boosting system under the condition that the working state of the air pressure sensor is a normal state; the fault conditions include failed and non-failed.
And when the working state of the air pressure sensor is a normal state, namely the air pressure sensor can work normally, determining the fault state of the brake boosting system. When the fault state of the brake boosting system is that a fault occurs, the brake boosting system cannot perform brake boosting on the vehicle; when the fault state of the brake boosting system is that no fault occurs, the brake boosting system can perform brake boosting on the vehicle.
Specifically, the fault state of the brake boosting system can be determined through the brake pedal signal and the reduction amount of the air pressure of the air tank within the first preset time. The VCU acquires a brake pedal signal within first preset time and air pressure reduction of the air tank before and after the first preset time, when a driver does not step on the brake within the first preset time, namely the VCU does not acquire the brake pedal signal, and under the condition that the air pressure reduction within the first preset time is larger than a first threshold value, the fault state of the brake power-assisted system is determined to be that a fault occurs.
It should be noted that the setting of the first preset time is related to the actual application, and the specific value is determined according to the actual application condition, which is not limited in this embodiment; the first preset threshold is set in relation to the first preset time, and the specific value is determined according to the actual application, which is not limited in this embodiment.
Specifically, the fault state of the brake boosting system can be determined by the continuous working time of the air pump and the pedal travel value in the working time. The VCU acquires the continuous working time of the air pump and the pedal travel value within the working time, and determines that the fault state of the brake boosting system is that the fault occurs under the condition that the continuous working time is longer than a second preset time and the travel value of the pedal is always 0 within the time, namely that a driver does not step on the brake pedal within the time.
It should be noted that the setting of the second preset time period is related to practical application, and the specific value is determined according to practical application, which is not limited in this embodiment.
Step 204: determining the fault type of the brake boosting system under the condition that the fault state of the brake boosting system is that a fault occurs; the fault type includes at least a gas leak fault.
When the brake boosting system can not perform brake boosting on the vehicle, further, the fault type of the brake boosting system is determined. When the fault type is an air leakage fault, the brake boosting system cannot realize brake boosting on the vehicle. Note that at least the types of failure including the leak failure are stored in the VCU in advance.
Specifically, when the fault state of the brake boosting system is that a fault occurs, the air pump is controlled to work, the change of the air pressure in the air tank is changed, and the fault type of the brake boosting system is determined according to the change condition of the air pressure in the air tank. During the VCU controlling the air pump to work, the fault type of the brake boosting system is determined to be an air leakage fault through the condition that the air pressure in the air tank can still rise.
It is to be noted that, conversely, if the air pressure in the air tank fails to increase during the operation of the VCU controlling the air pump, it is determined that the air pressure sensor is malfunctioning.
Specifically, when the fault state of the brake boosting system is that a fault occurs, the VCU controls the air pump to stop working, changes the air pressure in the air tank, and determines the fault type of the brake boosting system according to the change condition of the air pressure in the air tank. And after the VCU controls the air pump to stop working, determining the fault type of the brake boosting system as an air leakage fault according to the condition that the air pressure in the air tank is reduced.
It should be noted that, conversely, if the air pressure in the air tank is still decreasing after the VCU controls the air pump to stop operating, it is determined that the air pressure sensor is malfunctioning.
Step 205: determining a fault level of the brake boosting system when the fault type of the brake boosting system is a gas leakage fault.
When the brake boosting system has air leakage fault, the fault level is further determined.
Specifically, different air pressure reduction rates in the air tank air pressure reduction process correspond to different fault levels, the fault levels of the brake boosting system are different under the condition that the air pressure reduction rates are different, the VCU acquires the air pressure reduction rates, and the fault levels can be determined according to the acquired air pressure reduction rates. When the air pressure reduction rate is a first preset rate, determining that the fault level of the brake boosting system is a first-level fault, and generating a slight air leakage phenomenon; when the air pressure reduction rate is a second preset rate, determining that the fault level of the brake boosting system is a secondary fault and generating a medium air leakage phenomenon; and when the air pressure reduction rate is the third preset rate, determining that the fault level of the brake boosting system is a three-level fault, and generating a severe air leakage phenomenon.
It should be noted that the correspondence between different air pressure drop rates and different fault levels is stored in the VCU in advance. The first preset rate, the second preset rate and the third preset rate are all preset rate ranges, the preset rate ranges are set in relation to the component attributes, the vehicle performance and the practical application in the brake power assisting system, and the specific values are determined according to the component attributes, the vehicle performance and the practical application condition in the brake power assisting system, which is not limited in this embodiment.
Step 206: and executing the brake boosting system fault processing operation corresponding to the fault level.
Different fault levels correspond to different processing operations, and under the condition that the fault levels are different, the fault processing operations executed by the VCUs are different, and the VCUs execute the corresponding processing operations according to the determined fault levels.
It should be noted that the correspondence between different failure levels and processing operations is stored in the VCU in advance.
Specifically, different fault levels of the brake boosting system correspond to different operations, and under the condition of different fault levels, executed fault processing operations of the brake boosting system are different, the VCU acquires the fault levels, and can determine the corresponding fault processing operations of the brake boosting system according to the acquired fault levels. When the fault level of the brake power-assisted system is a first-level fault, executing a first operation, wherein the brake power-assisted system generates a slight air leakage phenomenon, the first operation is to control the vehicle to reduce the maximum speed and the peak power of the vehicle to 50% through the VCU, and at the moment, the brake power-assisted system does not influence the brake function, and can remind a driver through various modes, and the vehicle brake power-assisted system generates the slight air leakage phenomenon and requires to be opened to a maintenance station for maintenance in time; when the fault level of the brake power-assisted system is a secondary fault, executing a second operation, wherein the brake power-assisted system generates a medium air leakage phenomenon, the second operation is a limp mode of controlling the whole vehicle through a VCU (virtual vehicle unit), linearly reducing the vehicle speed to a desired value (preset and stored according to actual conditions) in the limp mode executing process, and increasing the recovery of brake energy to compensate mechanical braking, wherein the brake power-assisted system does not influence the braking function, and meanwhile, the brake power-assisted system can remind a driver of the vehicle of the medium air leakage phenomenon in various ways, so that the driving safety is damaged, the driver is required to stop to a safety zone, and the driver is informed of repairing the vehicle to a nearby maintenance point as soon as possible; and executing a third operation under the condition that the fault level of the brake power-assisted system is a three-level fault, wherein the brake power-assisted system has a serious air leakage phenomenon, the third operation is to control the whole vehicle to stop through a VCU (virtual vehicle Unit), the vehicle speed is linearly reduced to 0 in the process, at the moment, the brake power-assisted system cannot meet the service braking requirement, and meanwhile, a driver is reminded of the vehicle brake system to have the serious air leakage fault through various modes, namely the vehicle is stopped in a certain time period, and the driver is asked to drive the vehicle to a safety zone as soon as possible.
It should be noted that the prompting mode may be displaying a prompting message on an instrument panel, or sending an alarm sound through a vehicle-mounted speaker to prompt a driver, or simultaneously prompting the driver through the instrument panel and the alarm sound, and the specific prompting mode is not limited in this embodiment.
Step 207: determining a vehicle state under the condition that the working state of the air pressure sensor is an abnormal state; the vehicle state comprises a parking state and a driving state;
and when the working state of the air pressure sensor is in an abnormal state, namely the air pressure sensor cannot work normally, determining the vehicle state.
Step 208: and executing a barometric pressure sensor fault handling operation corresponding to the vehicle state.
The vehicle comprises a parking state and a driving state, and the VCU executes different air pressure sensor fault processing operations under different vehicle states. It should be noted that the correspondence between the different vehicle states and the operation of the air pressure sensor to deal with the failure is stored in the VCU in advance. In the embodiment of the application, under the condition that the working state of the air pressure sensor is a normal state, the fault type and the fault level of the brake boosting system are gradually determined, and after the fault level is determined, corresponding processing operation is executed according to the prestored brake boosting system fault processing operation corresponding to the fault level; when the working state of the air pressure sensor is an abnormal state, namely the air pressure sensor cannot work normally, the vehicle state is determined, and after the vehicle state is determined, corresponding processing operation is executed according to prestored sensor fault processing operation corresponding to the vehicle state.
Specifically, when the vehicle is in the parking state, the VCU performs a processing operation for prohibiting the vehicle from driving, and the VCU may prompt the driver to prohibit driving of the vehicle in various ways.
Specifically, when the vehicle is in a driving state, the VCU executes processing operation of the vehicle in a limp-home mode, linearly reduces the vehicle speed in the limp-home mode, estimates the actual air pressure in the air tank according to information such as the stepping frequency, the stepping depth and the single duration of the brake pedal in the driving process, controls the air pump to work according to the information, guarantees the brake function of the vehicle in the limp-home mode, and simultaneously can prompt relevant information of a driver in various modes.
It should be noted that the information for prohibiting driving may be displayed on the instrument panel to prompt the driver to prohibit driving the vehicle, the warning sound may be sent to prompt the driver to prohibit driving the vehicle, and the instrument panel and the warning sound may prompt the driver to prohibit driving the vehicle at the same time.
It should be noted that the limp home mode is a failure operation mode of the vehicle, the electric vehicle has various electronic sensors and actuators, if one sensor is damaged, the VCU is judged to be wrong, and a special program is designed for the designer, namely the limp home mode. When the VCU finds that any one of the sensor data is abnormal, on one hand, the warning can be performed in various ways, and on the other hand, the limp home mode is adopted, so that the vehicle runs in a mode with slightly poor performance.
In the embodiment of the application, the working state of the air pressure sensor is determined by acquiring the voltage value of the air pressure sensor and according to the voltage value. The working state includes a normal state and an abnormal state. And determining the fault state of the brake boosting system under the condition that the working state of the air pressure sensor is a normal state. The fault status includes failed and not failed. And determining the fault type of the brake boosting system under the condition that the fault state of the brake boosting system is that the fault occurs. The failure type includes at least a gas leak failure. And under the condition that the fault type of the brake power-assisted system is an air leakage fault, determining the fault level of the brake power-assisted system, and executing the fault processing operation of the brake power-assisted system corresponding to the fault level. The fault level is determined, and corresponding processing operation is executed according to the fault level. In the case where the operating state of the air pressure sensor is an abnormal state, the vehicle state is determined. The vehicle state includes a parking state and a driving state. A barometric pressure sensor fault handling operation corresponding to a vehicle state is performed. Therefore, on the basis of not adding any new device, whether the air pressure sensor has a fault or not can be determined firstly, fault processing operation of different air pressure sensors is executed based on different vehicle states, then the refined fault level is determined, and corresponding processing operation is executed according to the fault level, so that the accuracy of fault identification and fault processing is improved, the driving safety of the vehicle is ensured, and the beneficial effects of improving the accuracy of the vehicle brake power-assisted system in fault detection and processing are achieved.
In the method for detecting and processing the fault of the electric vehicle brake boosting system provided by the embodiment of the present application, the execution main body may be a brake boosting device of a vehicle, or a module in the brake boosting system for executing the method for detecting and processing the fault of the electric vehicle brake boosting system. In the embodiment of the present application, a method for detecting and processing a fault of an electric vehicle brake boosting system is taken as an example, and a device for detecting and processing a fault of an electric vehicle brake boosting system provided in the embodiment of the present application is described.
Referring to fig. 3, a block diagram of a structure of a fault detection processing apparatus for an electric vehicle brake boosting system according to an embodiment of the present application is shown, and as shown in fig. 3, the fault detection processing apparatus 300 for an electric vehicle brake boosting system may specifically include:
a first obtaining module 301, configured to obtain a voltage value of the air pressure sensor;
a first determining module 302, configured to determine an operating state of the air pressure sensor according to the voltage value; the working state comprises a normal state and an abnormal state;
a second determining module 303, configured to determine a fault state of the brake boosting system when the working state of the air pressure sensor is a normal state; the fault status includes failed and not failed;
a third determining module 304, configured to determine a fault type of the brake boosting system if a fault state of the brake boosting system is that a fault has occurred; the fault type includes at least a gas leakage fault;
a fourth determining module 305, configured to determine a fault level of the brake boosting system if the fault type of the brake boosting system is an air leakage fault;
and the execution module 306 is used for executing the brake boosting system fault processing operation corresponding to the fault level.
The electric vehicle brake boosting system fault detection processing apparatus 300 may further include:
a fifth determination module 307 for performing a failure processing operation for prohibiting the vehicle from running in a case where the vehicle is in a stopped state;
an execution module 306 is configured to execute a fault handling operation that controls the vehicle to enter a limp home mode if the vehicle is in a driving state.
Optionally, the executing module 306 may include:
a first execution sub-module for executing a failure processing operation for prohibiting the vehicle from running, in a case where the vehicle is in a stopped state;
a second execution sub-module for executing a fault handling operation of controlling the vehicle to enter a limp home mode in a case where the vehicle is in a running state;
the third execution submodule is used for executing the first operation under the condition that the fault level of the brake boosting system is a primary fault;
the fourth execution submodule is used for executing a second operation under the condition that the fault level of the brake boosting system is a secondary fault;
and the fifth execution submodule is used for executing a third operation under the condition that the fault level of the brake boosting system is a three-level fault.
Optionally, the first obtaining module 301 may include:
the first acquisition submodule is used for acquiring a brake pedal signal within first preset time and air pressure reduction of the air tank before and after the first preset time;
the second acquisition submodule is used for acquiring the continuous working time of the air pump and the pedal travel value in the working time;
the third acquisition sub-module is used for acquiring the air pressure change condition of the air tank;
and the fourth acquisition submodule is used for acquiring the air pressure reduction rate of the air tank in the air pressure reduction process.
Optionally, the first determining module 302 may include:
the first determining submodule is used for determining that the working state of the air pressure sensor is an abnormal state under the condition that the voltage value is greater than a first preset voltage value; the air pressure sensor is also used for determining that the working state of the air pressure sensor is an abnormal state under the condition that the voltage value is smaller than a second preset voltage value;
and the second determining submodule is used for determining that the working state of the air pressure sensor is a normal state under the condition that the voltage value is less than or equal to the first preset voltage value and is greater than or equal to the second preset voltage value.
Optionally, the second determining module 303 may include:
and the third determining submodule is used for determining that the fault state of the brake boosting system is that a fault occurs under the condition that the brake pedal signal is not received within the first preset time and the air pressure reduction is greater than a first threshold value.
And the fourth determining submodule is used for determining that the fault state of the brake boosting system is that a fault occurs under the conditions that the continuous working time length is greater than a second preset time length and the pedal travel value in the working time length is always 0.
Optionally, the third determining module 304 may include:
a fifth determining submodule, configured to determine that the fault type of the brake boosting system is an air leakage fault when the air pressure is increased;
and the sixth determining submodule is used for determining that the fault type of the brake boosting system is a gas leakage fault under the condition that the air pressure is reduced.
Optionally, the fourth determining module 305 may include:
the seventh determining submodule is used for determining that the fault level of the brake boosting system is a primary fault under the condition that the air pressure reduction rate is a first preset rate;
the eighth determining submodule is used for determining that the fault level of the brake boosting system is a secondary fault under the condition that the air pressure reduction rate is a second preset rate;
and the ninth determining submodule is used for determining that the fault level of the brake boosting system is a three-level fault under the condition that the air pressure reduction rate is a third preset rate.
The embodiment of the present application further provides an electric vehicle, where the electric vehicle may include, but is not limited to, at least one of an electric passenger car, an electric truck, and a special vehicle, and the embodiment of the present application is not limited to a specific type of the electric vehicle.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A fault detection processing method for a brake boosting system of an electric vehicle is characterized by comprising the following steps:
acquiring a voltage value of the air pressure sensor;
determining the working state of the air pressure sensor according to the voltage value; the working state comprises a normal state and an abnormal state;
determining the fault state of the brake boosting system under the condition that the working state of the air pressure sensor is a normal state; the fault status includes failed and not failed;
determining the fault type of the brake boosting system under the condition that the fault state of the brake boosting system is that a fault occurs; the fault type includes at least a gas leakage fault;
determining the fault level of the brake boosting system under the condition that the fault type of the brake boosting system is a gas leakage fault;
and executing the brake boosting system fault processing operation corresponding to the fault level.
2. The method of claim 1, wherein the determining the operating state of the barometric pressure sensor based on the voltage value further comprises:
determining a vehicle state under the condition that the working state of the air pressure sensor is an abnormal state; the vehicle state comprises a parking state and a driving state;
and executing a barometric pressure sensor fault handling operation corresponding to the vehicle state.
3. The method of claim 2, wherein the performing barometric pressure sensor fault handling operations corresponding to the vehicle state comprises:
executing a failure processing operation that prohibits the vehicle from running in a case where the vehicle is in a stopped state;
executing a fault handling operation that controls the vehicle to enter a limp home mode in a case where the vehicle is in a running state.
4. The method of claim 1, wherein determining the operating state of the barometric pressure sensor based on the voltage value comprises:
determining that the working state of the air pressure sensor is an abnormal state under the condition that the voltage value is greater than a first preset voltage value;
determining that the working state of the air pressure sensor is an abnormal state under the condition that the voltage value is smaller than a second preset voltage value;
and determining that the working state of the air pressure sensor is a normal state under the condition that the voltage value is less than or equal to the first preset voltage and greater than or equal to the second preset voltage value.
5. The method of claim 1, wherein determining the fault state of the brake boosting system in the case where the operation state of the air pressure sensor is the normal state comprises:
acquiring a brake pedal signal within a first preset time and the air pressure reduction quantity of an air tank before and after the first preset time;
and under the condition that the brake pedal signal is not received within the first preset time and the air pressure reduction amount is larger than a first threshold value, determining that the fault state of the brake power assisting system is that a fault occurs.
6. The method of claim 5, wherein determining the type of failure of the brake boosting system in the event that the brake boosting system has failed comprises:
controlling the air pump to work to obtain the air pressure change condition of the air tank;
and determining the fault type of the brake boosting system to be a gas leakage fault under the condition of the air pressure rise.
7. The method of claim 1, wherein determining a fault condition of a brake boosting system in the case that the operation state of the air pressure sensor is a normal state further comprises:
acquiring the continuous working duration of the air pump and a pedal travel value in the working duration;
and determining that the fault state of the brake boosting system is that a fault occurs under the condition that the continuous working time length is longer than a second preset time length and the pedal travel value in the working time length is always 0.
8. The method of claim 7, wherein determining the type of failure of the brake boosting system in the event that the brake boosting system has failed further comprises:
controlling the air pump to stop working to obtain the air pressure change condition of the air tank;
and determining the fault type of the brake boosting system as a gas leakage fault under the condition that the air pressure is reduced.
9. The method according to any one of claims 6 or 8, wherein determining the fault level of the brake boosting system in the case that the fault type of the brake boosting system is a blow-by fault comprises:
acquiring the air pressure reduction rate of the air tank in the air pressure reduction process;
determining the fault level of the brake boosting system according to the air pressure reduction rate;
when the air pressure reduction rate is a first preset rate, determining that the fault level of the brake boosting system is a first-level fault;
when the air pressure reduction rate is a second preset rate, determining that the fault level of the brake boosting system is a secondary fault;
and when the air pressure reduction rate is a third preset rate, determining that the fault level of the brake boosting system is a three-level fault.
10. The method of claim 9, wherein the performing a brake boosting system fault handling operation corresponding to the fault level comprises:
executing a first operation under the condition that the fault level of the brake boosting system is a primary fault;
executing a second operation under the condition that the fault level of the brake boosting system is a secondary fault;
and executing a third operation under the condition that the fault level of the brake power assisting system is a three-level fault.
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| CN202111674467.0A CN114212070A (en) | 2021-12-31 | 2021-12-31 | Fault detection processing method for electric vehicle brake power-assisted system |
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Application publication date: 20220322 |