CN110816508A - Vehicle fault detection method and device, vehicle and storage medium - Google Patents
Vehicle fault detection method and device, vehicle and storage medium Download PDFInfo
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- CN110816508A CN110816508A CN201910734854.5A CN201910734854A CN110816508A CN 110816508 A CN110816508 A CN 110816508A CN 201910734854 A CN201910734854 A CN 201910734854A CN 110816508 A CN110816508 A CN 110816508A
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- vacuum pump
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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
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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
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- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The embodiment of the invention discloses a vehicle fault detection method and device, a vehicle and a storage medium. The method comprises the following steps: acquiring the starting state of a vacuum pump, the state of a brake pedal, the vacuum pressure of a vacuum pump sensor and the environmental pressure of an environmental sensor; determining a preset pressure change trend according to the starting state of the vacuum pump and the state of the brake pedal, and detecting the fault of a vacuum pump sensor according to the vacuum pressure and the pressure change trend; when the vacuum pump sensor is in a normal working state, pre-stored vacuum pump limit pressure is obtained, and the fault of the environment sensor is detected according to the limit pressure and the environment pressure. According to the technical scheme of the embodiment of the invention, the fault of the vacuum system when the voltage of the vacuum sensor is in a normal range is realized, the fault detection accuracy of the vacuum pump system is improved, and the running safety of the vehicle can be enhanced.
Description
Technical Field
The embodiment of the invention relates to the technical field of automatic control, in particular to a vehicle fault detection method, a vehicle fault detection device, a vehicle and a storage medium.
Background
With the development of social economy, automobiles gradually blend into the aspects of life, but with the popularization of automobile applications, unprecedented pressure is brought to the environment and energy, so that electric automobiles and hybrid automobiles become the current world-recognized development trend. At present electric automobile adopts vacuum pump evacuation to provide the helping hand for braking system, when the driver steps on brake pedal, provides the braking helping hand through the pressure differential between atmospheric pressure and the vacuum tank, and the vacuum in the vacuum tank reduces simultaneously, when the vacuum degree reduces to the certain degree, can use the vacuum pump to supply the vacuum of vacuum tank to guarantee electric automobile's braking effect. The vacuum pump is the only vacuum source in the electric automobile, and how to ensure the normal operation of the vacuum pump becomes the focus of the current research.
In the prior art, the fault detection of the vacuum pump is only limited to judging whether the voltage of a pressure sensor of the vacuum pump is in a normal range or not, and when the voltage of the pressure sensor of the vacuum pump is in the normal range, the vacuum pump is determined to have no fault.
Disclosure of Invention
The invention provides a vehicle fault detection method and device, a vehicle and a storage medium, which are used for realizing fault detection of a vehicle vacuum pump, improving the accuracy of fault detection and improving the running safety of the vehicle.
In a first aspect, an embodiment of the present invention provides a vehicle fault detection method, where the method includes:
acquiring the starting state of a vacuum pump, the state of a brake pedal, the vacuum pressure of a vacuum pump sensor and the environmental pressure of an environmental sensor;
determining a preset pressure change trend according to the starting state of the vacuum pump and the state of the brake pedal, and detecting the fault of a vacuum pump sensor according to the vacuum pressure and the pressure change trend;
when the vacuum pump sensor is in a normal working state, pre-stored vacuum pump limit pressure is obtained, and the fault of the environment sensor is detected according to the limit pressure and the environment pressure.
In a second aspect, an embodiment of the present invention further provides a vehicle fault detection apparatus, including:
the parameter acquisition module is used for acquiring the starting state of the vacuum pump, the state of a brake pedal, the vacuum pressure of a vacuum pump sensor and the environmental pressure of an environmental sensor;
the vacuum fault module is used for determining a preset pressure change trend according to the starting state of the vacuum pump and the state of the brake pedal and detecting the fault of a vacuum pump sensor according to the vacuum pressure and the pressure change trend;
and the environmental fault module is used for acquiring the limit pressure prestored by the vacuum pump when the vacuum pump sensor is in a normal working state, and detecting the fault of the environmental sensor according to the limit pressure and the environmental pressure. In a third aspect, an embodiment of the present invention further provides a vehicle, including:
one or more controllers;
one or more vacuum pump sensors for acquiring vacuum pressure of the vacuum pump;
one or more environmental sensors for acquiring an ambient pressure;
a memory for storing one or more programs,
when the one or more programs are executed by the one or more controllers, the one or more controllers are caused to implement the vehicle failure detection method according to any one of the embodiments of the invention.
In a fourth aspect, the embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the vehicle fault detection method according to any one of the embodiments of the present invention.
According to the technical scheme of the embodiment of the invention, the starting state of the vacuum pump, the state of the brake pedal, the vacuum pressure of the vacuum pump sensor and the environmental pressure of the environmental sensor are obtained, the pressure change trend is determined based on the starting state of the vacuum pump and the state of the brake pedal, the fault of the vacuum pump sensor is detected according to the vacuum pressure and the pressure change trend, the limit pressure of the vacuum pump is obtained when the vacuum pump sensor is in a normal working state, the fault detection of the related sensor of the vehicle vacuum pump is realized by detecting the fault of the environmental sensor according to the limit pressure and the environmental pressure, the fault of the vacuum system is detected when the voltage of the vacuum pump sensor is in a normal range, the potential safety hazard of vehicle running is eliminated, and.
Drawings
FIG. 1 is a flow chart of a vehicle fault detection method according to an embodiment of the present invention;
fig. 2 is a flowchart of a vehicle fault detection method according to a second embodiment of the present invention;
FIG. 3 is an exemplary diagram of a vacuum pump sensing failure detection provided by the second embodiment of the present invention;
fig. 4 is a schematic diagram illustrating the effect of fault control according to the second embodiment of the present invention;
FIG. 5 is an exemplary diagram of environmental sensor fault detection provided by a second embodiment of the present invention;
fig. 6 is a schematic diagram illustrating the control effect of the vacuum pump under a communication failure according to a second embodiment of the present invention;
fig. 7 is a schematic diagram illustrating the control effect of the vacuum pump under a communication failure according to a second embodiment of the present invention;
fig. 8 is a schematic structural diagram of a vehicle fault detection device according to a third embodiment of the present invention;
fig. 9 is a schematic structural diagram of a vehicle according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be noted that, for convenience of description, only a part of the structures related to the present invention, not all of the structures, are shown in the drawings, and furthermore, embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
Example one
Fig. 1 is a flowchart of a vehicle fault detection method according to an embodiment of the present invention, where the embodiment is applicable to a situation of fault detection of a sensor associated with a vacuum pump of a vehicle, and the method may be executed by a vehicle fault detection apparatus, where the apparatus may be implemented in a hardware and/or software manner, and referring to fig. 1, the method according to the embodiment of the present invention includes:
step 101, acquiring a vacuum pump starting state, a brake pedal state, vacuum pressure of a vacuum pump sensor and environmental pressure of an environmental sensor.
The vacuum pump can be equipment for providing a vacuum source in a vehicle, the vacuum pump can provide vacuum for the vehicle when being started, and the starting state of the vacuum pump can comprise a starting state and a non-starting state; the brake pedal can be a device for starting the braking of the vehicle, when the brake pedal is pressed down, the vehicle can start to decelerate, and when the brake pedal is not pressed down, the original running state of the vehicle can be maintained; the vacuum pump sensor can be arranged in the vacuum pump and can detect the pressure in the vacuum pump, and the vacuum pump sensor can detect the pressure of the vacuum pump when the vacuum pressure can be detected; the environment sensor may be provided in a cabin of the vehicle, and may acquire atmospheric pressure of an environment in which the vehicle is located.
In the embodiment of the invention, the vehicle controller in the vehicle can acquire the starting state of the vacuum pump, the state of the brake pedal, the vacuum pressure and the ambient pressure, specifically, the acquisition mode can be to acquire the voltage signal corresponding to the parameter source, and the vehicle controller can acquire the starting state of the vacuum pump, the state of the brake pedal, the vacuum pressure and the ambient pressure according to the period, and can also acquire the parameters in real time.
And 102, determining a preset pressure change trend according to the starting state of the vacuum pump and the state of the brake pedal, and detecting the fault of a vacuum pump sensor according to the vacuum pressure and the pressure change trend.
The pressure variation trend can be a pre-stored transformation trend and can include a decreasing trend, an increasing trend and the like, the vacuum pump opening state, the brake pedal state and the pressure variation trend have corresponding relations, and when the vacuum pump opening state and the brake pedal state are different, the corresponding pressure variation trends can be different.
Specifically, the corresponding pressure change trend may be determined according to the acquired vacuum pump opening state and the acquired brake pedal state, for example, when the vacuum pump is in the opening state, because the brake pedal is not stepped on, the vacuum pump pumps vacuum and the vacuum degree is not consumed, so the pressure in the vacuum pump may gradually increase, the pressure change trend corresponding to the vacuum pump being in the opening state and the brake pedal not being stepped on may be determined as an increasing trend, and the pressure change trend may be determined according to the actual influence relationship between the vacuum pump opening state and the brake pedal on the vacuum pump pressure in the physical environment.
And 103, when the vacuum pump sensor is in a normal working state, acquiring the pre-stored limit pressure of the vacuum pump, and detecting the fault of the environmental sensor according to the limit pressure and the environmental pressure.
The environment sensor can detect faults only when the vacuum pump sensor works normally, the limit pressure can be the maximum pressure which can be reached by the vacuum pump during vacuum pumping, the limit pressure can be related to the performance of the vacuum pump and the atmospheric pressure of the environment where the vacuum pump is located, and the limit pressure which can be reached by the vacuum pump is smaller when the environment pressure is larger.
In the embodiment of the invention, after the fault detection is carried out on the vacuum pump sensor, if the vacuum pump sensor is determined to be in the normal working state, the limit pressure of the vacuum pump can be obtained, and the limit pressure of the vacuum pump can be obtained according to laboratory tests or the actual conditions of a vehicle. When the limit pressure of the vacuum pump and the environmental pressure of the environment where the vehicle is located are obtained, the relation between the limit pressure and the environmental pressure can be determined to determine whether the environmental sensor is in a fault state, for example, if the relation between the limit pressure and the environmental pressure is in the performance range of the vacuum pump, which indicates that the data measured by the environmental sensor is correct, the environmental sensor can be in a normal working state, otherwise, the environmental sensor can be considered to be in a fault state.
According to the technical scheme of the embodiment of the invention, the starting state of the vacuum pump, the state of the brake pedal, the vacuum pressure of the vacuum pump sensor and the environmental pressure of the environmental sensor are obtained, the pressure change trend is determined based on the starting state of the vacuum pump and the state of the brake pedal, the fault of the vacuum pump sensor is detected according to the vacuum pressure and the pressure change trend, the limit pressure of the vacuum pump is obtained when the vacuum pump sensor is in a normal working state, the fault detection of the related sensor of the vehicle vacuum pump is realized according to the limit pressure and the environmental pressure, the fault of the vacuum system is prevented from being discovered in time, the fault of the vacuum system can be still accurately judged when the voltage of the vacuum pump sensor is in a normal range, the potential safety hazard of vehicle running can be eliminated, and the safety of the.
Example two
Fig. 2 is a flowchart of a vehicle fault detection method according to a second embodiment of the present invention, which is embodied based on the second embodiment of the present invention, and referring to fig. 2, the method according to the second embodiment of the present invention includes:
The voltage signal may be a signal for determining whether the vacuum pump sensor and the environmental sensor are working normally, and when the voltage signal is too high or too low, neither the vacuum pump sensor nor the environmental sensor can work normally, for example, when the voltage signal is too high, the vacuum pump sensor may be in a fault of too high voltage, and when the voltage signal is too low, the vacuum pump sensor may be in a fault of too low voltage.
In the embodiment of the invention, in order to further improve the detection of the fault of the vehicle vacuum pump, the voltage signals of the vacuum pump sensor and the environment sensor can be obtained before the fault is detected according to the vacuum pressure and the environment pressure. For example, the vehicle control unit may collect the power supply voltage of the vacuum pump sensor and the power supply voltage of the environmental sensor.
The preset condition may be a condition for judging normal operation of the vacuum pump sensor and the environmental sensor, and may include an upper limit and a lower limit of voltage, and the like.
Specifically, the normal working voltage ranges of the vacuum pump sensor and the environment sensor can be obtained, and whether the judged voltage signal is within the working voltage range of the preset condition or not can be determined. For example, the preset condition may be 0.5V to 4.5V, and it is determined whether the voltage signals of the vacuum pump sensor and the environmental sensor satisfy the above voltage range.
And 203, if the voltage signal meets a preset condition, determining that the vacuum pump sensor and the environment sensor are in a normal working state.
Specifically, when the voltage signals of the vacuum pump sensor and the environmental sensor belong to a preset condition range, the voltage signal of the vacuum pump sensor and the voltage signal of the environmental sensor may be considered to satisfy the preset condition.
And 204, if not, determining that the vacuum pump sensor and/or the environment sensor are in fault.
In the embodiment of the present invention, when the voltage signal of the vacuum pump sensor or the voltage signal of the environment sensor does not satisfy the preset condition, a fault of the corresponding vacuum pump sensor and the environment sensor may be determined, for example, when the voltage signal of the vacuum pump sensor is higher than an upper limit range of the preset condition, a fault of the vacuum pump sensor may be determined.
And step 205, acquiring the starting state of the vacuum pump, the state of the brake pedal, the vacuum pressure of the vacuum pump sensor and the environmental pressure of the environmental sensor.
Specifically, the vehicle controller may obtain the vacuum pump start state, the brake pedal state, the vacuum pressure of the vacuum pump sensor, and the ambient pressure of the ambient sensor, and the time for obtaining the parameters may be the same or different, for example, when the vehicle controller needs to perform fault detection on the vacuum pump sensor, the brake pedal state and the vacuum pump start state are obtained, the vacuum pressure of the vacuum sensor may be obtained in real time, and the time for obtaining the vacuum pump start state, the brake pedal state, the vacuum pressure of the vacuum pump sensor, and the ambient pressure of the ambient sensor may not be synchronized.
And step 206, judging the opening state of the vacuum pump and the state of the brake pedal.
The vacuum pump starting state can be the state that the vacuum pump is started or closed, can be obtained by a vehicle control unit through a vehicle-mounted bus or a hard line, the brake pedal state can be the state of a vehicle brake pedal, when the brake pedal is stepped on, the vacuum degree generated by the vacuum pump can be consumed to decelerate the vehicle, and when the brake pedal is not stepped on, the vacuum degree generated by the vacuum pump can not be changed.
Specifically, the vehicle control unit can detect the vacuum pump and the brake pedal to determine the starting state of the vacuum pump and the state of the brake pedal.
And step 207, if the brake pedal is in a non-treading state and the vacuum pump is in an opening state, determining that the pressure variation trend is an increasing trend.
The non-depressed state may be a state in which the brake pedal is not depressed, the vacuum level in the vehicle is not consumed, and the running speed of the vehicle may not be changed. The on state may refer to an operating state of the vacuum pump, and when the vacuum pump is in the on state, the vacuum pump performs vacuum pumping, and a vacuum degree in the vehicle may be increased.
Specifically, if the brake pedal is not depressed, the vacuum degree of the vehicle is not consumed, and the vacuum pump is in an operating state, at this time, the vacuum pump may perform vacuum pumping, the vacuum degree of the vacuum pump gradually increases, and the absolute value of the pressure value corresponding to the vacuum pressure may be in an increasing trend.
And 208, if the brake pedal state is a stepping-on state and the vacuum pump opening state is a non-opening state, determining that the pressure variation trend is a decreasing trend.
In the embodiment of the invention, if the brake pedal is pressed down, the vehicle needs to consume the vacuum degree to assist the vehicle in decelerating, and the vacuum pump is in the non-opening state, the vacuum pump does not pump vacuum to provide the vacuum degree for the vehicle, and in this case, the pressure change of the vacuum pump sensor can be in a decreasing trend.
And 209, sequencing the vacuum pressures according to the acquisition time, and determining the current pressure change trend according to the sequenced vacuum pressures.
The current pressure variation trend may be a pressure variation trend determined from the vacuum pump sensor data, and may be an actual transformation trend of the vacuum pump sensor.
In the embodiment of the invention, the obtained vacuum pressures of the vacuum pump sensors can be sequenced according to the obtaining time, and the pressure change trend actually measured by the vacuum pump sensors can be determined according to the magnitude change trend of the sequenced vacuum pressures.
And step 210, judging that the current pressure trend is different from the pressure change trend.
Specifically, the current pressure trend of the vacuum pump may be compared with a pressure variation trend, and it is determined whether the pressure trend actually measured by the vacuum pump sensor is different from the pressure variation trend, where the pressure variation trend is a theoretical variation trend of the vacuum pump sensor, and when the vacuum pump sensor is normal, the current pressure trend of the vacuum pump sensor should be consistent with the pressure variation trend.
In the embodiment of the invention, the theoretical variation trend of the vacuum pump sensor indicates that the current pressure trend of the vacuum pump sensor is consistent with the pressure variation trend when the vacuum pump sensor is normal, and indicates that the vacuum pressure measured by the vacuum pump sensor is inaccurate and indicates that the vacuum pump sensor is in a fault state when the current pressure trend of the vacuum pump sensor is different from the pressure variation trend.
And step 212, if the current pressure trend is the same as the pressure change trend, determining that the vacuum pump is in a normal working state.
Specifically, if the current pressure trend of the vacuum pump sensor is the same as the pressure change trend, it can be characterized that the vacuum pump sensor has the same theoretical pressure change trend, and the vacuum pump can be in a normal working state.
And 213, acquiring the pre-stored limit pressure of the vacuum pump when the vacuum pump sensor is in a normal working state.
The limit pressure may be a maximum pressure that the vacuum pump can evacuate to in the current environment.
In the embodiment of the invention, when the vacuum pump sensor works normally, the environment sensor can be detected to judge whether a fault exists, and the limit pressure of the vacuum pump can be obtained before detection.
Optionally, when the vehicle is in a ready state, controlling the vacuum pump to vacuumize; when the rate of change of the vacuum pressure of the vacuum pump sensor is less than a threshold rate of change, the vacuum pressure of the vacuum pump sensor is taken as a limit pressure.
The READY state can be a state that various devices of the vehicle are READY for work, such as a READY state of the vehicle; the rate of change of the vacuum pressure may be the amount of change in the vacuum pressure per unit time, and the threshold rate of change may be a parameter indicative of the state in which the vacuum pump reaches a limit, which may be pre-measured in a laboratory.
In the embodiment of the invention, after the vehicle is in the READY state, the vacuum pump can be controlled to work until the pressure variation in unit time is smaller than the threshold variation rate, the vacuum pressure in the vacuum pump at the moment can be determined to reach the limit, and the large vacuum pump pressure measured by the vacuum pump sensor at the moment can be used as the limit pressure. After the limit pressure is acquired in the current environment, the limit pressure can be stored in the vehicle control unit, and when the limit pressure needs to be acquired, the limit pressure can be directly acquired.
For example, the vehicle controller determines whether the change slope R of the absolute value of the vacuum pressure is smaller than a certain value R1 and larger than 0, if the duration T is satisfied, the step aims to enable the vacuum pump to the limit condition, the environmental pressure is calculated through the limit vacuum pressure value and the capacity η of the vacuum pump, and whether the data acquired by the environmental pressure sensor is accurate is checked.
And step 214, determining the ratio of the limit pressure to the ambient pressure as a detection coefficient.
The detection coefficient may be a coefficient reflecting the current vacuum pumping capacity of the vacuum pump, and the ratio of the limiting pressure to the ambient pressure may be the detection coefficient of the vacuum pump.
Specifically, the vehicle control unit may calculate the stored limit pressure and the environmental pressure obtained by the environmental sensor to determine a ratio of the limit pressure to the environmental pressure, and may use the ratio as a detection coefficient.
Step 215, judging that the detection coefficient is within a preset evaluation range.
Wherein the evaluation range may be a range in which the vacuum pumping capability of the vacuum pump is evaluated.
In the embodiment of the invention, whether the detection coefficient is in a preset evaluation range can be judged, for example, whether the ratio Pcal/P3 of the calculated environmental pressure Pcal-P2 to the environmental sensor collecting pressure P3 is in a reasonable range, and 0.8 ≦ Pcal/P3 ≦ 1.2 can be judged.
And step 216, if the detection coefficient is within a preset evaluation range, determining that the environmental sensor is in a normal working state.
Specifically, when the detection coefficient belongs to the preset evaluation range, it can be stated that the environmental pressure acquired by the environmental sensor belongs to a normal range, and the environmental sensor can be in a normal state.
And step 217, if the detection coefficient does not belong to a preset evaluation range, determining that the environmental sensor has a fault.
In the embodiment of the invention, when the detection coefficient belongs to the preset evaluation range, the ratio of the limit pressure to the environmental pressure exceeds the evaluation range, which can indicate that the working performance of the current vacuum pump exceeds the working performance of a normal real pump, and can determine that the environmental sensor has a fault and the obtained environmental pressure is inaccurate.
According to the technical scheme of the embodiment of the invention, whether the vacuum pump sensor and the environment sensor have faults is judged through voltage signals of the vacuum pump sensor and the environment sensor, when the vacuum pump sensor and the environment sensor are normal, the starting state of the vacuum pump, the state of a brake pedal, the vacuum pressure of the vacuum pump sensor and the environment pressure of the environment sensor are obtained, the pressure change trend is determined according to the starting state of the vacuum pump and the state of the brake pedal, the current pressure trend of the vacuum pump sensor is compared with the pressure change trend, when the trends are the same, the vacuum pump sensor is determined to be in a normal working state, and when the trends are different, the vacuum pump sensor is determined to be. When the vacuum pump sensor is in a normal working state, the limit pressure of the vacuum pump can be obtained, the detection coefficient of the vacuum pump is determined according to the limit pressure and the environmental pressure, if the detection coefficient is in an evaluation range, the environmental sensor normally works, otherwise, the environmental sensor fails, the failure detection of the related sensor of the vacuum pump is realized, the failure of the vacuum system can be found in time, and the safety of vehicle running is enhanced.
Further, on the basis of the embodiment of the present invention, when the vacuum pump sensor fails and the environmental sensor fails, the vacuum pump is controlled according to a corresponding preset control strategy.
In the embodiment of the invention, when the vacuum pump sensor or the environment sensor has a fault, the vacuum pump can be controlled according to a preset control strategy, so that the fault of the vacuum pump can be prevented.
Further, on the basis of the above embodiment of the present invention, when the vacuum pump sensor fails and the environmental sensor fails, controlling the vacuum pump according to a corresponding preset control strategy includes:
if the vacuum pump sensor fails, when the brake pedal state is detected to be a stepping-down state, controlling the vacuum pump to be started for a preset first starting time length, and then controlling the vacuum pump to be stopped for a preset closing time length; if the vacuum pump sensor fails, controlling the vacuum pump to be started for a preset second time and then to be closed when the brake pedal is detected to be in a non-treaded state; and if the environmental sensor fails, increasing the closing pressure threshold value of the vacuum pump.
The first starting time duration can be the starting time duration of the vacuum pump when the vacuum degree is consumed in the vehicle due to braking operation, the closing time duration can be the closing time duration in the working interval of the vacuum pump when the vacuum pump works, and the high-temperature damage caused by continuous working of the vacuum pump can be prevented. The second on-time may be an operating time when no vacuum is consumed in the vehicle, and the vacuum pump may be turned off after the vacuum pump operates for the second start time.
In the embodiment of the invention, if the vacuum pump sensor fails, when a brake pedal is stepped on, the vacuum degree of the vehicle is consumed, the vacuum pump can be started for a first starting time period and then be stopped for a second time period, and the process can be repeated all the time; when the brake pedal is not stepped on and the vacuum degree of the vehicle is not consumed, the second starting time can be started, the vacuum pump works to ensure that the vacuum degree of the vehicle is kept at a safe level.
The method comprises the steps of firstly judging whether a brake pressure sensor is placed in a vacuum tank for collecting absolute pressure in the vacuum tank and feeding back the absolute pressure to an upper layer controller through a voltage signal, step s, judging whether the two voltages are in a reasonable voltage range after the upper layer controller collects a voltage signal sent by a vacuum pressure sensor and a voltage signal for supplying power to the vacuum pressure sensor, judging whether a voltage is too high to cause a fault if the two voltages are lower than a certain value, judging that a voltage range of the fault is not too low to cause a fault if the two voltages are not in the reasonable range, entering a step s if the two voltages are in the reasonable voltage range, entering a step e.g., if the two voltages are in the reasonable voltage range, normally, the voltage signal sent by the vacuum pressure sensor is within 0.5-4.5V, normally, controlling the vacuum pump to cause the fault voltage range if the vacuum pump is higher than the preset pressure, or lower than the preset pressure, judging that the vacuum pump control pressure control is normally lower than the preset pressure, if the vacuum pressure control pressure of the vacuum pump is lower than the preset pressure, the preset pressure control pressure, the preset pressure control time when the vacuum pump is not lower than the preset pressure, the preset pressure control time of the vacuum pump, the vacuum pump is not lower pressure control time of the preset pressure control time of the vacuum pump, the vacuum pump is not lower pressure control time of the vacuum pump, the preset pressure control time of the vacuum pump, the vacuum pump is set pressure control time of the vacuum pump, if the vacuum pump, if the vacuum pump is not lower pressure control time of the vacuum pump, the vacuum pump is set pressure control time of the vacuum pump, if the vacuum pump is not lower pressure control time of the vacuum pump, if the vacuum pump is not lower pressure control time of the vacuum pump, if the vacuum pump, if the vacuum pump is not lower pressure control time of the vacuum pump, if the vacuum pump is set pressure control time of the vacuum pump is not lower pressure control time of the vacuum pump, if the vacuum pump is lower pressure control time of the vacuum pump is not lower pressure control time of the vacuum pump, if the vacuum pump is lower pressure control time of the vacuum pump is within the vacuum pump, if the vacuum pump is within the vacuum pump, if the preset pressure control time of the vacuum pump, if the preset pressure control time of the vacuum pump, if the preset pressure control time is lower pressure control time of the vacuum pump, if the preset pressure control time of the vacuum pump, if the preset pressure control time of the preset pressure, if the vacuum pump, the preset pressure control time of the preset pressure, if the preset pressure control time is not lower pressure.
When the environmental sensor detection method comprises a step s of collecting a voltage signal sent by the environmental sensor and a voltage signal for supplying power to the environmental sensor, the step s of collecting the two voltages is within a normal voltage range, if the two voltages exceed a certain value, an overhigh voltage fault is considered, if the two voltages are lower than the certain value, an overlow voltage fault is considered, if the two voltages are not within a reasonable range, the step s is entered, if the two voltages are normally within a range of 0.5-4.5V, if the two voltages are higher than a threshold of 4.5V, or lower than a threshold of 0.dy 5V, the voltage range of the environmental sensor is specifically judged, the step s is carried out according to the model of the actual sensor, the step s of detecting the environmental sensor, the vacuum pump is considered, if the vacuum pump pressure of the vacuum pump enters a vacuum pump, the vacuum pump is not lower than the threshold value, if the vacuum pump pressure of the vacuum pump, the vacuum pump is not lower than the vacuum pressure, the vacuum pump is considered, the vacuum pressure detection module is not lower than the vacuum pressure, the vacuum pressure detection threshold value, the vacuum pressure detection module, the vacuum processing module is considered, the vacuum processing module, the vacuum processing method is considered, the vacuum processing module, the vacuum processing method comprises the vacuum processing, the vacuum processing module, the vacuum processing method is considered, the vacuum pump, the vacuum pressure of the vacuum pump, the vacuum processing system, the vacuum pump, the vacuum processing method comprises the vacuum processing, the vacuum pump, the vacuum processing method comprises the vacuum pump, the vacuum processing, the vacuum pump, the vacuum process, the vacuum pump, the vacuum process, the vacuum pump, the vacuum process, the vacuum pump process, the vacuum pump, the vacuum process, the vacuum pump process, the vacuum pump process, the vacuum pump, the vacuum process, the environment process, the vacuum process, the environment process, the vacuum process, the environment process, the vacuum process, the environment process, the vacuum process, the environment process.
For example, in the control of the vacuum pump, since the vacuum pump does not feed back a signal whether to operate or not to the upper controller, for example, due to a failure of a chip of the vehicle controller, a failure of a line, and a failure of a relay, the control of the vacuum pump is actually an open-loop control. Therefore, it is necessary to detect whether the vacuum pump control communication is normal. Fig. 6 is a schematic view illustrating a control effect of a vacuum pump under a communication failure according to a second embodiment of the present invention, and fig. 7 is a schematic view illustrating a control effect of a vacuum pump under a communication failure according to a second embodiment of the present invention; fig. 6 may be a schematic diagram illustrating the control effect of a communication failure in an operating state of the vacuum pump, and fig. 7 may be a schematic diagram illustrating the control effect of a communication failure in a non-operating state of the vacuum pump, referring to fig. 6 and 7, by performing failure monitoring on the vacuum pump, it is possible to maintain the vacuum pressure in the vehicle vacuum system within a certain range by turning on and off the vacuum pump, and it is possible to prevent the vacuum pump from being damaged due to continuous operation by making the vacuum pump reach the turn-off threshold. When the vacuum pump is in a closed state, the vacuum degree of the vacuum pump is prevented from being reduced through the fault monitoring of the vacuum pump, so that the vacuum pressure is kept in a certain range, and the vehicle can be assisted to brake, and the safety of the vehicle is improved.
EXAMPLE III
Fig. 8 is a schematic structural diagram of a vehicle fault detection apparatus provided in the third embodiment of the present invention, which is capable of executing the vehicle fault detection method provided in any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method. The device can be implemented by software and/or hardware, and specifically comprises: a parameter acquisition module 410, a vacuum fault module 420, and an environmental fault module 430.
The parameter obtaining module 410 is configured to obtain a vacuum pump on state, a brake pedal state, a vacuum pressure of a vacuum pump sensor, and an ambient pressure of an ambient sensor.
And the vacuum fault module 420 is configured to determine a preset pressure change trend according to the vacuum pump starting state and the brake pedal state, and detect a vacuum pump sensor fault according to the vacuum pressure and the pressure change trend.
And the environmental fault module 430 is configured to, when the vacuum pump sensor is in a normal working state, obtain a limit pressure pre-stored by the vacuum pump, and detect a fault of the environmental sensor according to the limit pressure and the environmental pressure.
According to the technical scheme of the embodiment of the invention, the starting state of the vacuum pump, the state of the brake pedal, the vacuum pressure of the vacuum pump sensor and the environmental pressure of the environmental sensor are obtained through the parameter obtaining module, the vacuum fault module determines the pressure change trend based on the starting state of the vacuum pump and the state of the brake pedal, the fault of the vacuum pump sensor is detected according to the vacuum pressure and the pressure change trend, the limit pressure of the vacuum pump is obtained when the vacuum pump sensor is in a normal working state, the fault of the environmental sensor is detected according to the limit pressure and the environmental pressure, the fault detection of the related sensor of the vehicle vacuum pump is realized, the fault of the vacuum pump when the voltage of the vacuum pump sensor is in a normal range is eliminated, the potential safety hazard of vehicle running is eliminated.
Further, on the basis of the above embodiment of the invention, the vacuum fault module includes:
and the state judgment unit is used for judging the starting state of the vacuum pump and the state of the brake pedal.
The trend reducing unit is used for determining that the pressure change trend is a reduced trend if the brake pedal state is a treaded state and the vacuum pump opening state is an unopened state;
and the increasing trend unit is used for determining that the pressure change trend is an increasing trend if the brake pedal state is a non-treading state and the vacuum pump opening state is an opening state.
And the current trend unit is used for sequencing the vacuum pressure according to the acquisition time and determining the current pressure change trend according to the sequenced vacuum pressure.
The fault detection unit is used for determining that the vacuum sensor has a fault if the current pressure trend is different from the pressure change trend; otherwise, the vacuum sensor is determined to be in a normal working state.
Further, on the basis of the implementation of the invention, the method further comprises the following steps:
and the control module is used for controlling the vacuum pump to vacuumize when the vehicle is in a preparation state.
And the limit acquisition module is used for taking the vacuum pressure of the vacuum pump sensor as the limit pressure when the change rate of the vacuum pressure of the vacuum pump sensor is smaller than the threshold change rate.
Further, on the basis of the above embodiment of the present invention, the environmental fault module includes:
a coefficient determination unit for determining a ratio of the limit pressure to the ambient pressure as a detection coefficient.
The state determining unit is used for determining that the environmental sensor is in a normal working state if the detection coefficient is within a preset evaluation range;
and the fault determining unit is used for determining that the environmental sensor has a fault if the detection coefficient does not belong to a preset evaluation range.
Further, on the basis of the above embodiment of the invention, the method further includes:
and the voltage acquisition module is used for respectively acquiring voltage signals of the vacuum pump sensor and the environment sensor.
The voltage detection module is used for determining that the vacuum pump sensor and the environment sensor are in a normal working state if the voltage signal meets a preset condition; and if not, determining that the vacuum pump sensor and/or the environment sensor are in fault.
Further, on the basis of the above embodiment of the invention, the method further includes:
and the control module is used for controlling the vacuum pump according to a corresponding preset control strategy when the vacuum pump sensor fails and the environment sensor fails.
Further, on the basis of the above embodiment of the invention, the control module includes:
and the first control unit is used for controlling the vacuum pump to be started for a preset first starting time length and then controlling the vacuum pump to be stopped for a preset closing time length when the brake pedal state is detected to be a stepping-on state if the vacuum pump sensor fails.
And the second control unit is used for controlling the vacuum pump to be started for a preset second time and then to be closed when the brake pedal is detected to be in a non-treaded state if the vacuum pump sensor fails.
And the third control unit is used for increasing the closing pressure threshold value of the vacuum pump if the environmental sensor fails.
Example four
Fig. 9 is a schematic structural diagram of a vehicle according to a fourth embodiment of the present invention, as shown in fig. 9, the vehicle includes a controller 70, a memory 71, an input device 72, and an output device 73; the number of the controllers 70 may be one or more, and one controller 70 is exemplified in fig. 9; the processor 70, memory 71, input device 72, and output device 73 in the vehicle may be connected by a bus or other means, and the bus connection is exemplified in fig. 9.
The memory 71, as a computer-readable storage medium, may be used to store software programs, computer-executable programs, and modules, such as program modules corresponding to the vehicle failure detection method in the embodiment of the present invention (for example, the parameter acquisition module 410, the vacuum failure module 420, and the environmental failure module 430 in the vehicle failure detection apparatus). The controller 70 executes various functional applications and data processing of the vehicle by running software programs, instructions, and modules stored in the memory 71, that is, implements the vehicle failure detection method described above.
The memory 71 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 71 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 71 may further include memory remotely located from the controller 70, which may be connected to the vehicle over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 72 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function controls of the vehicle. The output device 73 may include a display device such as a display screen. One or more vacuum pump sensors for acquiring vacuum pressure of the vacuum pump; one or more environmental sensors for acquiring ambient pressure.
EXAMPLE five
Fifth, an embodiment of the present invention further provides a storage medium containing computer-executable instructions, which when executed by a computer processor, perform a vehicle fault detection method, the method including:
acquiring the starting state of a vacuum pump, the state of a brake pedal, the vacuum pressure of a vacuum pump sensor and the environmental pressure of an environmental sensor;
determining a preset pressure change trend according to the starting state of the vacuum pump and the state of the brake pedal, and detecting the fault of a vacuum pump sensor according to the vacuum pressure and the pressure change trend;
when the vacuum pump sensor is in a normal working state, pre-stored vacuum pump limit pressure is obtained, and the fault of the environment sensor is detected according to the limit pressure and the environment pressure.
Of course, the storage medium containing the computer-executable instructions provided by the embodiments of the present invention is not limited to the method operations described above, and may also perform related operations in the vehicle fault detection method provided by any embodiments of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the embodiment of the vehicle failure detection apparatus, the included units and modules are only divided according to the functional logic, but are not limited to the above division as long as the corresponding functions can be realized; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A vehicle fault detection method, characterized by comprising:
acquiring the starting state of a vacuum pump, the state of a brake pedal, the vacuum pressure of a vacuum pump sensor and the environmental pressure of an environmental sensor;
determining a preset pressure change trend according to the starting state of the vacuum pump and the state of the brake pedal, and detecting the fault of a vacuum pump sensor according to the vacuum pressure and the pressure change trend;
when the vacuum pump sensor is in a normal working state, pre-stored vacuum pump limit pressure is obtained, and the fault of the environment sensor is detected according to the limit pressure and the environment pressure.
2. The method of claim 1, wherein the determining a preset pressure variation trend according to the vacuum pump on state and the brake pedal state, and detecting a vacuum pump sensor fault according to the vacuum pressure and the pressure variation trend, comprises:
judging the starting state of the vacuum pump and the state of the brake pedal;
if the brake pedal state is a treading state and the vacuum pump opening state is an unopened state, determining that the pressure change trend is a decreasing trend;
if the brake pedal is in a non-treading state and the vacuum pump is in an opening state, determining that the pressure change trend is an increasing trend;
sequencing the vacuum pressure according to the acquisition time, and determining the current pressure change trend according to the sequenced vacuum pressure;
if the current pressure trend is not the same as the pressure change trend, determining that the vacuum sensor has a fault;
otherwise, the vacuum sensor is determined to be in a normal working state.
3. The method of claim 1, wherein obtaining the ultimate pressure of the vacuum pump comprises:
when the vehicle is in a preparation state, controlling the vacuum pump to vacuumize;
when the rate of change of the vacuum pressure of the vacuum pump sensor is less than a threshold rate of change, the vacuum pressure of the vacuum pump sensor is taken as a limit pressure.
4. The method of claim 1, wherein said detecting an environmental sensor fault based on said extreme pressure and said ambient pressure comprises:
determining a ratio of the limit pressure to the ambient pressure as a detection coefficient;
if the detection coefficient is within a preset evaluation range, determining that the environmental sensor is in a normal working state;
and if the detection coefficient does not belong to a preset evaluation range, determining that the environmental sensor has a fault.
5. The method of claim 1, further comprising, prior to said obtaining a vacuum pump on state, a brake pedal state, a vacuum pressure of a vacuum pump sensor, and an ambient pressure of an ambient sensor:
respectively acquiring voltage signals of the vacuum pump sensor and the environment sensor;
if the voltage signal meets a preset condition, determining that the vacuum pump sensor and the environment sensor are in a normal working state;
and if not, determining that the vacuum pump sensor and/or the environment sensor are in fault.
6. The method of claim 1, further comprising:
and when the vacuum pump sensor fails and the environment sensor fails, controlling the vacuum pump according to a corresponding preset control strategy.
7. The method of claim 6, wherein the controlling the vacuum pump according to the corresponding preset control strategy comprises:
if the vacuum pump sensor fails, when the brake pedal state is detected to be a stepping-down state, controlling the vacuum pump to be started for a preset first starting time length, and then controlling the vacuum pump to be stopped for a preset closing time length;
if the vacuum pump sensor fails, controlling the vacuum pump to be started for a preset second time and then to be closed when the brake pedal is detected to be in a non-treaded state;
and if the environmental sensor fails, increasing the closing pressure threshold value of the vacuum pump.
8. A vehicle failure detection device characterized by comprising:
the parameter acquisition module is used for acquiring the starting state of the vacuum pump, the state of a brake pedal, the vacuum pressure of a vacuum pump sensor and the environmental pressure of an environmental sensor;
the vacuum fault module is used for determining a preset pressure change trend according to the starting state of the vacuum pump and the state of the brake pedal and detecting the fault of a vacuum pump sensor according to the vacuum pressure and the pressure change trend;
and the environmental fault module is used for acquiring the limit pressure prestored by the vacuum pump when the vacuum pump sensor is in a normal working state, and detecting the fault of the environmental sensor according to the limit pressure and the environmental pressure.
9. A vehicle, characterized in that the vehicle comprises:
one or more controllers;
one or more vacuum pump sensors for acquiring vacuum pressure of the vacuum pump;
one or more environmental sensors for acquiring an ambient pressure;
a memory for storing one or more programs,
when the one or more programs are executed by the one or more controllers, cause the one or more controllers to implement the vehicle fault detection method of any of claims 1-7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a vehicle fault detection method according to any one of claims 1 to 7.
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