CN111775959B - Fault diagnosis method and device for accelerator pedal and vehicle - Google Patents
Fault diagnosis method and device for accelerator pedal and vehicle Download PDFInfo
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- CN111775959B CN111775959B CN202010652619.6A CN202010652619A CN111775959B CN 111775959 B CN111775959 B CN 111775959B CN 202010652619 A CN202010652619 A CN 202010652619A CN 111775959 B CN111775959 B CN 111775959B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W50/02—Ensuring safety in case of control system failures, e.g. by diagnosing, circumventing or fixing failures
- B60W50/0205—Diagnosing or detecting failures; Failure detection models
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- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
- Auxiliary Drives, Propulsion Controls, And Safety Devices (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a fault diagnosis method and device for an accelerator pedal and a vehicle. The fault diagnosis method of the accelerator pedal comprises the following steps: acquiring a first voltage signal acquired by a first sensor and a second voltage signal acquired by a second sensor; if the accelerator pedal is judged to be in the initial idling area according to the first voltage signal, then the accelerator pedal leaves the initial idling area; recording a second voltage signal obtained when the accelerator pedal leaves an initial idle speed region as an idle speed region critical value; if the accelerator pedal is judged to leave the idle speed area according to the first voltage signal and the accelerator pedal is judged to be positioned in the idle speed area according to the second voltage signal and the threshold value of the idle speed area, the first voltage signal and the second voltage signal are asynchronous; and if the number of times of asynchronization of the first voltage signal and the second voltage signal is judged to exceed the threshold of times, the accelerator pedal is in fault. The invention can accurately reflect the signal synchronism information of the accelerator pedal in time, realize more accurate fault diagnosis and improve the safety of the whole vehicle.
Description
Technical Field
The embodiment of the invention relates to the technical field of signal processing of an automobile accelerator pedal, in particular to a fault diagnosis method and device of the accelerator pedal and a vehicle.
Background
An accelerator pedal is an important component in a vehicle, reflects a driving intention of a driver, is an important input of a vehicle torque, and controls a power output of an engine. When the accelerator pedal signal is abnormal, the dynamic property of the vehicle can be influenced, and the driving safety can be also influenced. Therefore, signal analysis and fault diagnosis for an accelerator pedal of an automobile are particularly important for safe driving of the entire automobile.
The existing accelerator pedal fault diagnosis mainly aims at diagnosing fault types such as accelerator pedal circuit faults, power supply faults, signal overrun and the like, and even if the problem of synchronism of two signals during accelerator pedal movement is involved, whether the difference value or the ratio of the two signals is overrun is judged.
The existing accelerator pedal fault diagnosis method cannot accurately and timely reflect the information of the synchronism of two paths of signals of the accelerator pedal, and the driving safety is influenced.
Disclosure of Invention
The embodiment of the invention provides a fault diagnosis method and device for an accelerator pedal and a vehicle, which can accurately reflect the signal synchronism information of the accelerator pedal in time, realize more accurate fault diagnosis and improve the safety of the whole vehicle.
In a first aspect, an embodiment of the present invention provides a method for diagnosing a fault of an accelerator pedal, where the accelerator pedal includes a first sensor and a second sensor, and the method includes:
acquiring a first voltage signal acquired by the first sensor and a second voltage signal acquired by the second sensor;
if the accelerator pedal is judged to be in an initial idling area according to the first voltage signal, then the accelerator pedal leaves the initial idling area; recording a second voltage signal obtained when the accelerator pedal leaves the initial idle speed region as an idle speed region critical value;
if the accelerator pedal is judged to leave the idle speed area according to the first voltage signal, and the accelerator pedal is judged to be positioned in the idle speed area according to the second voltage signal and the threshold value of the idle speed area, the first voltage signal and the second voltage signal are asynchronous;
and if the number of times of asynchronization of the first voltage signal and the second voltage signal is judged to exceed a number threshold, the accelerator pedal is in fault.
Optionally, the determining whether the accelerator pedal is in an initial idle region according to the first voltage signal includes:
if the first voltage signal is smaller than a first preset voltage and the duration time exceeds a first preset time, the accelerator pedal is in the initial idle speed area; if the first voltage signal is greater than the first preset voltage, the accelerator pedal leaves the initial idle speed area.
Optionally, the first voltage signal and the second voltage signal are not synchronized, including:
if the first voltage signal is increased and is greater than a second preset voltage, judging that the accelerator pedal leaves the idle speed area according to the first voltage signal; the second preset voltage is greater than the first preset voltage; if the second voltage signal is smaller than the idle speed area critical value, judging that the accelerator pedal does not leave the idle speed area according to the second voltage signal;
or if the first voltage signal is greater than a second preset voltage, judging that the accelerator pedal is out of the idle speed area according to the first voltage signal; the second preset voltage is greater than the first preset voltage; and if the second voltage signal is smaller than the critical value of the idle speed area and the duration time exceeds a second preset time, judging that the accelerator pedal returns to the idle speed area according to the second voltage signal.
Optionally, determining that 1 is added to the number of times that the first voltage signal and the second voltage signal are not synchronized includes:
after the first voltage signal and the second voltage signal are judged to be asynchronous, if the first voltage signal is increased and the first voltage signal exceeds a third preset voltage, a counter is increased by 1;
wherein the third preset voltage is greater than the second preset voltage.
Optionally, determining that the number of times that the first voltage signal and the second voltage signal are not synchronized is less than 1 includes:
after the first voltage signal and the second voltage signal are judged to be synchronous, if the first voltage signal is increased and the first voltage signal exceeds a fourth preset voltage, a counter is decreased by 1;
wherein the fourth preset voltage is greater than the first preset voltage.
Optionally, the lower limit value of the counter is 0.
Optionally, after the acquiring the first voltage signal collected by the first sensor and the second voltage signal collected by the second sensor, the method further includes:
judging whether an enabling condition is met, and if the enabling condition is met, judging whether the first voltage signal and the second voltage signal are synchronous;
the enabling conditions include: the first voltage signal is smaller than a first upper limit voltage and larger than a first lower limit voltage, the second voltage signal is smaller than a second upper limit voltage and larger than a second lower limit voltage, and the first sensor and the second sensor are normally powered.
Optionally, the acquiring a first voltage signal collected by the first sensor and a second voltage signal collected by the second sensor includes:
filtering the first voltage signal; filtering the second voltage signal; and acquiring a filtered value of the first voltage signal and a filtered value of the second voltage signal.
In a second aspect, an embodiment of the present invention provides a failure diagnosis device for an accelerator pedal, including:
the voltage signal acquisition module is used for acquiring a first voltage signal acquired by the first sensor and a second voltage signal acquired by the second sensor;
an idle speed region critical value obtaining module, configured to, if it is determined that the accelerator pedal is in an initial idle speed region according to the first voltage signal, leave the initial idle speed region; recording a second voltage signal obtained when the accelerator pedal leaves the initial idle speed region as an idle speed region critical value;
the signal asynchronization judging module is used for judging that the first voltage signal and the second voltage signal are asynchronous if the accelerator pedal is judged to leave the idle area according to the first voltage signal and the accelerator pedal is judged to be located in the idle area according to the second voltage signal and the idle area critical value;
and the fault judgment module is used for judging that the accelerator pedal has faults if the number of times of asynchronization of the first voltage signal and the second voltage signal is judged to exceed a number threshold.
In a third aspect, an embodiment of the present invention provides a vehicle, including: an accelerator pedal and a failure diagnosis device of an accelerator pedal provided in any of the embodiments of the present invention; the accelerator pedal includes a first sensor and a second sensor.
In the embodiment of the invention, whether an accelerator pedal leaves an initial idling area is judged according to a first voltage signal, and a second voltage signal is obtained and recorded as an idling area critical value when the accelerator pedal leaves the initial idling area; and comparing the first voltage signal with a second preset voltage and comparing the second voltage signal with an idle speed region critical value to judge whether the first voltage signal and the second voltage signal are synchronous or not. Therefore, the first voltage signal and the second voltage signal are directly compared with the respective preset values, and the comparison is not needed after the difference value or the ratio of the two paths of signals is obtained, so that the processing steps are reduced, and the processing time is saved. And when the number of asynchronous times exceeds the threshold value of the number of asynchronous times, the accelerator pedal is determined to be out of order, the influence of accidental factors is prevented, and the accuracy of fault diagnosis is improved. Therefore, compared with the prior art, the embodiment of the invention can timely and accurately reflect the signal synchronism information of the accelerator pedal, realize more accurate fault diagnosis and improve the safety of the whole vehicle.
Drawings
FIG. 1 is a schematic diagram of an accelerator pedal and an electronic control unit according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a method for diagnosing a failure of an accelerator pedal according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating another method for diagnosing a failure of an accelerator pedal according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a failure diagnosis device for an accelerator pedal according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a vehicle according to an 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 further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Embodiments of the present invention provide a fault diagnosis method for an accelerator pedal, which may be performed by an accelerator pedal fault diagnosis device that may be disposed in an Electronic Control Unit (ECU). Fig. 1 is a schematic diagram of connection between an accelerator pedal and an electronic control unit according to an embodiment of the present invention. Referring to FIG. 1, an accelerator pedal 100 illustratively includes a first sensor and a second sensor. The first sensor transmits the collected first voltage signal to an Electronic Control Unit (ECU); the second sensor transmits the collected second voltage signal to the electronic control unit ECU. The electronic control unit ECU performs fault diagnosis of the problem of synchronism of the first voltage signal and the second voltage signal of the vehicle accelerator pedal 100.
Fig. 2 is a schematic flow chart of a fault diagnosis method for an accelerator pedal according to an embodiment of the present invention. As shown in fig. 2, the method for diagnosing a failure of an accelerator pedal includes the steps of:
s110, acquiring a first voltage signal acquired by the first sensor and a second voltage signal acquired by the second sensor.
The first sensor and the second sensor collect opening degree information of an accelerator pedal, the opening degree information is converted into voltage information, the voltage information is transmitted to a control module of the vehicle, and the control module determines the opening degree of a vehicle throttle valve according to the voltage signal so as to control torque output of the engine. Therefore, the synchronism of the voltage collected by the first sensor and the second sensor is crucial, and if the voltage is asynchronous, the reaction of the control module is disordered, so that the real intention of the driver cannot be judged through the first voltage signal and the second voltage signal, and the driving safety is influenced.
Illustratively, the first sensor and the second sensor can be position sensors, respectively collect position information of an accelerator pedal, convert the two paths of position information into a first voltage signal and a second voltage signal, and transmit the first voltage signal and the second voltage signal to a control module of the vehicle, and the control module performs fault diagnosis according to the first voltage signal and the second voltage signal. Alternatively, the first sensor and the second sensor may be powered by the same power source. Alternatively, the control module may be an engine electronic control unit.
S120, if the accelerator pedal is judged to be in the initial idling area according to the first voltage signal, then the accelerator pedal leaves the initial idling area; and recording a second voltage signal obtained when the accelerator pedal leaves the initial idle region as an idle region critical value.
Whether the accelerator pedal is in the idling area can be judged according to the first voltage signal, and can also be judged according to the second voltage signal. Taking the first voltage signal as an example, if the first voltage signal is smaller than the set value, it can be determined that the accelerator pedal is located in the idle speed region, and at this time, the first voltage signal may also be referred to as the first voltage signal being located in the idle speed region. Then, "determining that the accelerator pedal is in the initial idle region and then leaving the initial idle region according to the first voltage signal" may also be understood as that the first voltage signal is in the initial idle region and then leaving the initial idle region. When the first voltage signal leaves the initial idle speed region, a second voltage signal is obtained and recorded as an idle speed region critical value, which is equivalent to calibrating the first voltage signal and the second voltage signal. The threshold value of the idle speed area is used as a judgment basis for judging whether the second voltage signal is in the idle speed area.
And S130, if the accelerator pedal is judged to leave the idle speed area according to the first voltage signal and the accelerator pedal is judged to be located in the idle speed area according to the second voltage signal and the idle speed area critical value, the first voltage signal and the second voltage signal are asynchronous.
The judgment basis of the asynchronism of the first voltage signal and the second voltage signal can be understood that the first voltage signal leaves the idling area, and the second voltage signal is in the idling area. When the synchronism of the first voltage signal and the second voltage signal is judged, the first voltage signal is only compared with a calibrated voltage value, and the second voltage signal is only compared with an idling region critical value. The difference or ratio of two voltage signals is not needed, and the judgment of whether the accelerator pedal is located in the idle speed area by the two voltage signals is not interfered mutually.
And S140, if the number of times that the first voltage signal and the second voltage signal are not synchronous exceeds the threshold of the number of times, the accelerator pedal is in fault.
In order to eliminate the interference of accidental factors and prevent the misjudgment of fault diagnosis, the number of times of asynchronization of the first voltage signal and the second voltage signal is recorded, and a fault is considered to occur when the number of asynchronization exceeds a threshold value. The number threshold value can be set as required in practical application, and the number is not limited in the application. Alternatively, the number threshold may be 10.
According to the fault diagnosis method for the accelerator pedal, whether the accelerator pedal leaves an initial idle speed area or not is judged according to a first voltage signal, and a second voltage signal is obtained and recorded as an idle speed area critical value when the accelerator pedal leaves the initial idle speed area; and comparing the first voltage signal with a calibration voltage and comparing the second voltage signal with an idle speed region critical value to judge whether the first voltage signal and the second voltage signal are synchronous. Therefore, the first voltage signal and the second voltage signal are directly compared with the respective preset values, and the comparison is not required to be carried out after the difference value or the ratio of the first voltage signal and the second voltage signal is obtained, so that the processing steps are reduced, and the processing time is saved. And when the number of asynchronous times exceeds the threshold value of the number of asynchronous times, the accelerator pedal is determined to be out of order, the influence of accidental factors is prevented, and the accuracy of fault diagnosis is improved. Therefore, compared with the prior art, the embodiment of the invention can timely and accurately reflect the signal synchronism information of the accelerator pedal, realize more accurate fault diagnosis and improve the safety of the whole vehicle.
On the basis of the above embodiments, further, determining whether the accelerator pedal is in the initial idle region according to the first voltage signal includes:
if the first voltage signal is smaller than a first preset voltage and the duration time exceeds a first preset time, the accelerator pedal is in an initial idling area; if the first voltage signal is greater than the first preset voltage, the accelerator pedal leaves the initial idle speed area.
The two voltage signals of the accelerator pedal have different ranges, wherein the range of one voltage signal is twice that of the other voltage signal. The first voltage signal is not limited to being a wide-range or a small-range voltage signal. The first preset voltage can be calibrated according to needs in actual application, and the size of the first preset voltage is not limited in the application. The first preset time can be calibrated according to needs in actual application, and the size of the first preset time is not limited in the application. For example, the first voltage signal is a wide-range voltage signal, the first preset voltage may be selected to be 1.11V, and the first preset time may be selected to be 0.1 s; when the first voltage signal is less than 1.11V and the duration exceeds 0.1s, the accelerator pedal is considered to be in an initial idle region; the accelerator pedal is considered to be out of the initial idle region when the first voltage signal is greater than 1.11V.
In addition to the above embodiments, there are various ways to determine that the first voltage signal and the second voltage signal are not synchronized, and some of them will be described below, but the present invention is not limited thereto.
In one embodiment, optionally, the first voltage signal and the second voltage signal are not synchronized, including:
if the first voltage signal is increased and is greater than the second preset voltage, judging that the accelerator pedal leaves an idle speed area according to the first voltage signal; the second preset voltage is greater than the first preset voltage; and if the second voltage signal is smaller than the threshold value of the idle speed area, judging that the accelerator pedal does not leave the idle speed area according to the second voltage signal.
The first voltage signal and the second voltage signal are both increased in the process that the driver steps on the accelerator pedal. If the first voltage signal is synchronous with the second voltage signal, the first voltage signal should be greater than a second preset voltage, and the second voltage signal should be greater than an idle region critical value, namely, the accelerator pedal is judged to leave the idle region according to the first voltage signal and the second voltage signal, and the first voltage signal and the second voltage signal are synchronous. At this time, if it is determined from the first voltage signal that the accelerator pedal is out of the idle region, but it is determined from the second voltage signal that the accelerator pedal is not out of the idle region, it is considered that the first voltage signal and the second voltage signal are out of synchronization.
The second preset voltage is a calibrated voltage for determining whether the accelerator pedal leaves the idle speed region according to the first voltage signal, and should be greater than a calibrated voltage (the first preset voltage) for determining whether the accelerator pedal leaves the initial idle speed region, and a value of the second preset voltage may be calibrated according to practical applications, and for example, the second preset voltage may be 1.22V.
In one embodiment, optionally, the first voltage signal and the second voltage signal are not synchronized, including:
if the first voltage signal is greater than the second preset voltage, judging that the accelerator pedal is out of the idle speed area according to the first voltage signal; the second preset voltage is greater than the first preset voltage; and if the second voltage signal is smaller than the critical value of the idle speed area and the duration time exceeds a second preset time, judging that the accelerator pedal returns to the idle speed area according to the second voltage signal.
When the driver continuously steps on the accelerator pedal or releases the accelerator pedal, and when the first voltage signal is still greater than the second preset voltage (i.e. the accelerator pedal is judged to be still outside the idle region according to the first voltage signal), if the second voltage signal falls below the threshold value of the idle region (i.e. the accelerator pedal is judged to be returned to the idle region according to the second voltage signal), and the duration time exceeds the second preset time, it is determined that the first voltage signal and the second voltage signal are out of synchronization. The second preset time can be calibrated according to actual requirements. Illustratively, the second preset time may be 0.25 s.
The first voltage signal is compared with the second preset voltage, the second voltage signal is compared with the idling region critical value, the first voltage signal and the second voltage signal are not interfered with each other, the calculation steps are simplified, and timely fault alarming is facilitated. And the synchronism of the first voltage signal and the second voltage signal of the accelerator pedal is diagnosed respectively according to the behaviors of stepping on and releasing the accelerator pedal of the driver, so that the reliability of diagnosis is improved.
On the basis of the above embodiments, in order to more accurately determine whether the first voltage signal and the second voltage signal have an asynchronous fault and to eliminate the interference of accidental factors, the embodiments of the present invention further limit the determination of whether the first voltage signal and the second voltage signal are actually asynchronous, and when the first voltage signal and the second voltage signal are actually asynchronous, the counter is incremented by 1. In addition, the number of asynchronizations can be reduced by 1 in the embodiment of the invention. The following describes the cases of adding 1 to the number of asynchronizations and subtracting 1 from the number of asynchronizations.
Optionally, the step of determining that the number of times that the first voltage signal and the second voltage signal are not synchronized is increased by 1 includes: after the first voltage signal and the second voltage signal are judged to be asynchronous, if the first voltage signal is increased and the first voltage signal exceeds a third preset voltage, the counter is increased by 1; the third preset voltage is greater than the second preset voltage.
The steps show that when the driver continuously steps on the accelerator pedal, the collected first voltage signal is continuously increased and exceeds a third preset voltage, and the first voltage signal and the second voltage signal are detected to be asynchronous before, the fault counter is automatically added once. In the embodiment of the invention, on the basis of detecting that two voltage signals are out of synchronization, whether a counter needs to be added by 1 is judged, namely, a driver continues to tread an accelerator pedal after the two voltage signals are out of synchronization, and the opening degree of the accelerator pedal continues to be increased, so that the third preset voltage is greater than the second preset voltage. The third preset voltage may be calibrated in practical application, and optionally, the third preset voltage may be 1.32V. Due to the arrangement, uncertain factors caused by switching of the first voltage signal at the boundary of the idle speed area are avoided, the phenomenon that the first voltage signal and the second voltage signal are asynchronous is judged more accurately, and then the counter is increased by 1.
Optionally, determining that the number of times that the first voltage signal and the second voltage signal are not synchronized is less than 1, including: after the first voltage signal and the second voltage signal are judged to be synchronous, if the first voltage signal is increased and the first voltage signal exceeds a fourth preset voltage, the counter is decreased by 1; the fourth preset voltage is greater than the first preset voltage.
If the driver continues to tread the accelerator pedal or treads the accelerator pedal again, the first voltage signal is increased, and when the first voltage signal exceeds the fourth preset voltage, if the asynchronous phenomenon of the first voltage signal and the second voltage signal is not detected before, the fault counter is automatically decreased once. Since the synchronism of the first voltage signal and the second voltage signal is determined after the accelerator pedal leaves the initial idle region, the fourth preset voltage is greater than the first preset voltage when determining whether the accelerator pedal leaves the initial idle region when determining whether the counter needs to be decremented by 1. The fourth preset voltage may be calibrated in practical application, and optionally, the fourth preset voltage may be the same as the second preset voltage. By the arrangement, misjudgment of asynchronism of the first voltage signal and the second voltage signal is avoided.
Further, the lower limit value of the counter is 0. So as to prevent the counter from continuously self-decreasing, and the failure of the counter caused by failing to reach the threshold value of times when the failure occurs is not reported.
Optionally, when the counter reaches a time threshold value, a fault that the first voltage signal and the second voltage signal of the accelerator pedal are not synchronous is considered to occur, and a control module of the vehicle reports the fault and stores a fault code; if the counter does not reach the frequency threshold value, the fault is not reported.
On the basis of the above embodiments, in order to obtain a more stable signal, the embodiments of the present invention further limit the acquisition of the first voltage signal and the second voltage signal. Obtain the first voltage signal of first sensor collection and the second voltage signal of second sensor collection, include: filtering the first voltage signal; filtering the second voltage signal; the filtered value of the first voltage signal and the filtered value of the second voltage signal are obtained.
The first voltage signal and the second voltage signal are filtered, so that interference noise in the signals can be removed, the signals before and after filtering are kept undistorted, a stable voltage signal value is obtained, and fault diagnosis is more accurate.
In the embodiment of the invention, the self-adding of the counter can prevent the fault false report caused by interference factors, the self-subtracting of the counter can avoid the fault false report caused by the accumulation of the counter caused by accidental factors, and the lower limit of the counter is set to be 0 to avoid the fault false report. And when the operation of the counter is judged, only the state of the first voltage signal needs to be considered, and the method is simple and easy to implement.
Fig. 3 is a schematic flow chart of another method for diagnosing a failure of an accelerator pedal according to an embodiment of the present invention. As shown in fig. 3, on the basis of the above embodiments, optionally, the method for diagnosing a fault of an accelerator pedal further includes, after acquiring the first voltage signal acquired by the first sensor and the second voltage signal acquired by the second sensor: and judging whether the enabling condition is met, and if the enabling condition is met, judging whether the first voltage signal and the second voltage signal are synchronous.
Specifically, the method for diagnosing the fault of the accelerator pedal comprises the following steps:
and S210, judging whether the enabling condition is met, if so, executing S230, and if not, finishing the diagnosis.
The enabling conditions comprise that the first voltage signal is smaller than a first upper limit voltage and larger than a first lower limit voltage, the second voltage signal is smaller than a second upper limit voltage and larger than a second lower limit voltage, and the first sensor and the second sensor are normally powered. The first upper limit voltage, the first lower limit voltage, the second upper limit voltage and the second lower limit voltage can be calibrated according to the requirements of practical application.
S220, acquiring a first voltage signal acquired by the first sensor and a second voltage signal acquired by the second sensor.
S230, determining whether the first voltage signal and the second voltage signal are synchronous, if yes, performing S250, otherwise, performing S240.
The step of determining whether the first voltage signal and the second voltage signal are synchronized may be determined according to the methods provided in the embodiments.
S240, adding 1 to a counter;
s250, subtracting 1 from the counter;
and S260, judging whether the number of times of asynchronization of the first voltage signal and the second voltage signal exceeds a number threshold, if so, executing S270, and otherwise, executing S280.
And S270, reporting the fault.
And S280, failure is not reported.
According to the fault diagnosis method for the accelerator pedal provided by the embodiment of the invention, before asynchronous fault diagnosis is carried out, judgment on whether the enabling condition is met is added, and diagnosis is continued only when the enabling condition is met. The reliability of the accelerator pedal failure diagnosis is increased.
The embodiment of the invention also provides a fault diagnosis device of the accelerator pedal, which can be used for realizing the fault diagnosis method of the accelerator pedal provided by each embodiment and has corresponding beneficial effects.
Fig. 4 is a schematic structural diagram of a failure diagnosis device for an accelerator pedal according to an embodiment of the present invention. As shown in fig. 4, the accelerator pedal failure diagnosis apparatus includes: the system comprises a voltage signal acquisition module 310, an idle speed region critical value acquisition module 320, a signal non-synchronization judgment module 330 and a fault judgment module 340. The voltage signal acquiring module 310 is configured to acquire a first voltage signal acquired by a first sensor and a second voltage signal acquired by a second sensor. The idle speed region critical value obtaining module 320 is configured to, if it is determined that the accelerator pedal is in the initial idle speed region according to the first voltage signal, leave the initial idle speed region; and recording a second voltage signal obtained when the accelerator pedal leaves the initial idle region as an idle region critical value. The out-of-signal-synchronization determining module 330 is configured to determine that the first voltage signal and the second voltage signal are out of synchronization if it is determined that the accelerator pedal leaves the idle region according to the first voltage signal and it is determined that the accelerator pedal is located in the idle region according to the second voltage signal and the idle region critical value. The failure determination module 340 is configured to determine that the accelerator pedal has a failure if it is determined that the number of times that the first voltage signal and the second voltage signal are not synchronized exceeds a number threshold.
On the basis of the above-mentioned embodiments, the signal obtaining module 310 further defines the obtaining of the first voltage signal and the second voltage signal. The signal obtaining module 310 is further configured to perform filtering processing on the first voltage signal; filtering the second voltage signal; the filtered value of the first voltage signal and the filtered value of the second voltage signal are obtained.
On the basis of the above-described embodiment, the idle region threshold value obtaining module 320 further defines whether the accelerator pedal is in the initial idle region according to the first voltage signal. The idling region threshold obtaining module 320 is further configured to determine that the accelerator pedal is in an initial idling region if the first voltage signal is less than a first preset voltage and the duration exceeds a first preset time; if the first voltage signal is greater than the first preset voltage, the accelerator pedal leaves the initial idle speed area.
On the basis of the above embodiment, the signal out-of-sync determining module 330 further defines whether the first voltage signal and the second voltage signal are out-of-sync. The out-of-signal-synchronization determining module 330 is further configured to determine that the accelerator pedal leaves the idle region according to the first voltage signal if the first voltage signal is increased and is greater than the second preset voltage; the second preset voltage is greater than the first preset voltage; if the second voltage signal is smaller than the critical value of the idle speed area, judging that the accelerator pedal does not leave the idle speed area according to the second voltage signal;
or if the first voltage signal is greater than the second preset voltage, judging that the accelerator pedal is out of the idle speed area according to the first voltage signal; the second preset voltage is greater than the first preset voltage; and if the second voltage signal is smaller than the critical value of the idle speed area and the duration time exceeds a second preset time, judging that the accelerator pedal returns to the idle speed area according to the second voltage signal.
On the basis of the above embodiments, the failure determination module 340 further defines the determination of whether the asynchronization does exist. The fault determining module 340 is further configured to determine that the number of times that the first voltage signal and the second voltage signal are not synchronized is increased by 1, including: after the first voltage signal and the second voltage signal are judged to be asynchronous, if the first voltage signal is increased and the first voltage signal exceeds a third preset voltage, the counter is increased by 1; the third preset voltage is greater than the second preset voltage.
Further, the fault determining module 340 is further configured to determine that the number of times that the first voltage signal and the second voltage signal are not synchronized is less than 1, including: after the first voltage signal and the second voltage signal are judged to be synchronous, if the first voltage signal is increased and the first voltage signal exceeds a fourth preset voltage, the counter is decreased by 1; the fourth preset voltage is greater than the first preset voltage.
In addition to the above embodiments, the accelerator pedal failure diagnosis apparatus further includes:
the enabling condition judging module is used for judging whether enabling conditions are met after a first voltage signal acquired by the first sensor and a second voltage signal acquired by the second sensor are acquired, and judging whether the first voltage signal and the second voltage signal are synchronous if the enabling conditions are met; the enabling conditions include: the first voltage signal is smaller than the first upper limit voltage and larger than the first lower limit voltage, the second voltage signal is smaller than the second upper limit voltage and larger than the second lower limit voltage, and the first sensor and the second sensor are normally powered.
The embodiment of the invention also provides a vehicle, which can realize the fault diagnosis method of the accelerator pedal provided by each embodiment and has corresponding beneficial effects.
Fig. 5 is a schematic structural diagram of a vehicle according to an embodiment of the present invention. As shown in fig. 5, the vehicle 400 includes: accelerator pedal 100 and accelerator pedal failure diagnosis apparatus 420 provided by the embodiment of the present invention; the accelerator pedal 100 includes a first sensor and a second sensor.
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 failure diagnosis method of an accelerator pedal including a first sensor and a second sensor, characterized by comprising:
acquiring a first voltage signal acquired by the first sensor and a second voltage signal acquired by the second sensor;
if the accelerator pedal is judged to be in an initial idling area according to the first voltage signal, then the accelerator pedal leaves the initial idling area; recording a second voltage signal obtained when the accelerator pedal leaves the initial idle speed region as an idle speed region critical value;
if the accelerator pedal is judged to leave the idle speed area according to the first voltage signal, and the accelerator pedal is judged to be positioned in the idle speed area according to the second voltage signal and the threshold value of the idle speed area, the first voltage signal and the second voltage signal are asynchronous;
if the number of times that the first voltage signal and the second voltage signal are out of synchronization exceeds a number threshold, the accelerator pedal is in fault;
wherein the first sensor and the second sensor are both position sensors;
when the synchronism of the first voltage signal and the second voltage signal is judged, the first voltage signal is only compared with a calibrated voltage value, and the second voltage signal is only compared with the critical value of the idle speed area; and judging whether the accelerator pedal leaves the calibration voltage of the idle speed area according to the first voltage signal, wherein the calibration voltage is larger than the calibration voltage when the accelerator pedal leaves the initial idle speed area.
2. The accelerator pedal failure diagnosis method according to claim 1, wherein determining whether the accelerator pedal is in an initial idle region based on the first voltage signal includes:
if the first voltage signal is smaller than a first preset voltage and the duration time exceeds a first preset time, the accelerator pedal is in the initial idle speed area; if the first voltage signal is greater than the first preset voltage, the accelerator pedal leaves the initial idle speed area.
3. The accelerator pedal failure diagnosis method according to claim 2, wherein the first voltage signal and the second voltage signal are not synchronized, comprising:
if the first voltage signal is increased and is greater than a second preset voltage, judging that the accelerator pedal leaves the idle speed area according to the first voltage signal; the second preset voltage is greater than the first preset voltage; if the second voltage signal is smaller than the idle speed area critical value, judging that the accelerator pedal does not leave the idle speed area according to the second voltage signal;
or if the first voltage signal is greater than a second preset voltage, judging that the accelerator pedal is out of the idle speed area according to the first voltage signal; the second preset voltage is greater than the first preset voltage; and if the second voltage signal is smaller than the critical value of the idle speed area and the duration time exceeds a second preset time, judging that the accelerator pedal returns to the idle speed area according to the second voltage signal.
4. The accelerator pedal failure diagnosis method according to claim 3, wherein determining that the number of times the first voltage signal and the second voltage signal are out of synchronization plus 1 comprises:
after the first voltage signal and the second voltage signal are judged to be asynchronous, if the first voltage signal is increased and the first voltage signal exceeds a third preset voltage, a counter is increased by 1;
wherein the third preset voltage is greater than the second preset voltage.
5. The accelerator pedal failure diagnosis method according to claim 3, wherein determining that the number of times the first voltage signal and the second voltage signal are out of synchronization is minus 1 comprises:
after the first voltage signal and the second voltage signal are judged to be synchronous, if the first voltage signal is increased and the first voltage signal exceeds a fourth preset voltage, a counter is decreased by 1;
wherein the fourth preset voltage is greater than the first preset voltage.
6. The accelerator pedal failure diagnosis method according to claim 5, wherein the lower limit value of the counter is 0.
7. The method of diagnosing a failure of an accelerator pedal according to claim 1, further comprising, after the acquiring the first voltage signal collected by the first sensor and the second voltage signal collected by the second sensor:
judging whether an enabling condition is met, and if the enabling condition is met, judging whether the first voltage signal and the second voltage signal are synchronous;
the enabling conditions include: the first voltage signal is smaller than a first upper limit voltage and larger than a first lower limit voltage, the second voltage signal is smaller than a second upper limit voltage and larger than a second lower limit voltage, and the first sensor and the second sensor are normally powered.
8. The accelerator pedal fault diagnosis method according to claim 1, wherein the acquiring a first voltage signal collected by the first sensor and a second voltage signal collected by a second sensor includes:
filtering the first voltage signal; filtering the second voltage signal; and acquiring a filtered value of the first voltage signal and a filtered value of the second voltage signal.
9. A failure diagnosis device of an accelerator pedal, characterized by comprising:
the voltage signal acquisition module is used for acquiring a first voltage signal acquired by the first sensor and a second voltage signal acquired by the second sensor; wherein the first sensor and the second sensor are both position sensors;
an idle speed region critical value obtaining module, configured to, if it is determined that the accelerator pedal is in an initial idle speed region according to the first voltage signal, leave the initial idle speed region; recording a second voltage signal obtained when the accelerator pedal leaves the initial idle speed region as an idle speed region critical value;
the signal asynchronization judging module is used for judging that the first voltage signal and the second voltage signal are asynchronous if the accelerator pedal is judged to leave the idle area according to the first voltage signal and the accelerator pedal is judged to be located in the idle area according to the second voltage signal and the idle area critical value; when the synchronism of the first voltage signal and the second voltage signal is judged, the first voltage signal is only compared with a calibrated voltage value, and the second voltage signal is only compared with the critical value of the idle speed area; judging whether the accelerator pedal leaves the calibration voltage of the idle speed area according to the first voltage signal, wherein the calibration voltage is larger than the calibration voltage when the accelerator pedal leaves the initial idle speed area;
and the fault judgment module is used for judging that the accelerator pedal has faults if the number of times of asynchronization of the first voltage signal and the second voltage signal is judged to exceed a number threshold.
10. A vehicle, characterized by comprising: an accelerator pedal and a failure diagnosis device of the accelerator pedal according to claim 9; the accelerator pedal includes a first sensor and a second sensor.
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| CN113781552A (en) * | 2021-09-06 | 2021-12-10 | 天津爱旭太阳能科技有限公司 | A search method and search system for offset machine in SE laser process |
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| CN104276106A (en) * | 2013-07-03 | 2015-01-14 | 上海汽车集团股份有限公司 | Accelerator pedal zero value fault diagnosis method for hybrid vehicles/blade electric vehicles |
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