CN111980790A - Fault diagnosis method and device for particulate matter trap, automobile and computer readable storage medium - Google Patents
Fault diagnosis method and device for particulate matter trap, automobile and computer readable storage medium Download PDFInfo
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- CN111980790A CN111980790A CN202010827829.4A CN202010827829A CN111980790A CN 111980790 A CN111980790 A CN 111980790A CN 202010827829 A CN202010827829 A CN 202010827829A CN 111980790 A CN111980790 A CN 111980790A
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- 239000013618 particulate matter Substances 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 54
- 238000003745 diagnosis Methods 0.000 title claims abstract description 48
- 238000011144 upstream manufacturing Methods 0.000 claims description 109
- 230000007257 malfunction Effects 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- 238000004590 computer program Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 25
- 238000004891 communication Methods 0.000 description 7
- 238000005070 sampling Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- DCRGHMJXEBSRQG-UHFFFAOYSA-N 1-[1-(cyclooctylmethyl)-5-(hydroxymethyl)-3,6-dihydro-2H-pyridin-4-yl]-3-ethyl-2-benzimidazolone Chemical compound O=C1N(CC)C2=CC=CC=C2N1C(CC1)=C(CO)CN1CC1CCCCCCC1 DCRGHMJXEBSRQG-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/06—By-pass systems
- F01N2550/12—By-pass systems of particulate filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/08—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a pressure sensor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
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Abstract
The embodiment of the application discloses a fault diagnosis method and device of a particulate matter trap, an automobile and a computer readable storage medium, wherein the fault diagnosis method of the particulate matter trap comprises the following steps: when the differential pressure sensor has no fault, first pressure information related to the differential pressure sensor after the automobile is started is obtained, and fault diagnosis is carried out on the particulate matter trap according to the first pressure information. By implementing the method and the device, the problems of low diagnosis precision, misjudgment or GPF fault missing judgment and the like in the prior art can be solved.
Description
Technical Field
The present application relates to the field of vehicle technologies, and in particular, to a method and an apparatus for diagnosing a fault of a particulate matter trap, an automobile, and a computer-readable storage medium.
Background
The national six regulations have higher requirements on gasoline engine particulate matter emission control, and more automobiles are provided with gasoline engine particulate matter traps GPF to meet the strict particulate matter emission regulations. In order to ensure that the GPF can work normally, national six regulations have clear requirements on diagnosis of key components such as the GPF and a differential pressure sensor.
Currently, the common protocol for GPF diagnosis is: and the differential pressure sensor detects absolute pressures of an inlet and an outlet of the GPF, calculates the pressure difference of exhaust flowing through the GPF, and then calculates the cumulative quantity coefficient CCF of soot and accumulated soot in the GPF according to the corresponding relation of the pressure difference, the exhaust flow and the temperature. The system diagnoses faults such as GPF differential pressure pipeline falling, reverse connection or GPF removal according to the CCF. However, in practice, it is found that the calculation of the CCF is greatly influenced by parameters such as sampling positions of the upstream and downstream differential pressure hoses of the differential pressure sensor and the calibration accuracy of the GPF exhaust temperature model, so that the accuracy of the GPF fault diagnosis is not high. In particular, CCF computation distortion can occur in extreme cases, which is prone to false or missed GPF faults.
Disclosure of Invention
The embodiment of the application provides a fault diagnosis method and device for a particulate matter trap, an automobile and a computer readable storage medium, which can solve the problems of low GPF fault diagnosis precision, erroneous judgment or GPF fault missing judgment and the like in the prior art.
In a first aspect, a method for diagnosing a fault of a particulate trap is provided, wherein an air inlet of the particulate trap is connected with a differential pressure sensor through an upstream differential pressure hose, and an air outlet of the particulate trap is connected with the differential pressure sensor through a downstream differential pressure hose, and the method for diagnosing a fault of the particulate trap comprises the following steps: when the differential pressure sensor is not in fault, acquiring first pressure information related to the differential pressure sensor after the automobile is started, wherein the first pressure information comprises the upstream pressure of the differential pressure sensor
Downstream pressure of the differential pressure sensor
And the atmospheric pressure in the environment surrounding the particulate trap
And performing fault diagnosis on the particulate matter trap according to the first pressure information.
In some embodiments, the method further comprises: recording second pressure information related to the differential pressure sensor when the automobile is not started after being electrified; the diagnosing the fault of the particulate matter trap according to the first pressure information comprises: and performing fault diagnosis on the particulate matter trap according to the first pressure information and the second pressure information.
In some embodiments, the first pressure information comprises a pressure upstream of the differential pressure sensor
Downstream pressure of the differential pressure sensor
And atmospheric pressure
The diagnosing the fault of the particulate matter trap according to the first pressure information comprises: in the above-mentioned
And the above-mentioned
The difference is greater than a first set threshold value, the
And the above-mentioned
The difference is greater than a second set threshold value, and
and the above-mentioned
And when the difference is smaller than a third set threshold value, judging that the upstream differential pressure hose and the downstream differential pressure hose of the differential pressure sensor are reversely connected.
In some embodiments, the method further comprises reporting that the upstream differential pressure hose of the differential pressure sensor is inverted with respect to the downstream differential pressure hose if the number of times that the upstream differential pressure hose of the differential pressure sensor is inverted with respect to the downstream differential pressure hose is determined within a first duration reaches a first preset number; or if the timing duration of the first timer exceeds a first preset duration, reporting that an upstream differential pressure hose and a downstream differential pressure hose of the differential pressure sensor are connected reversely; the first timer is used for increasing the time in a first set step when the upstream differential pressure hose and the downstream differential pressure hose of the differential pressure sensor are reversely connected.
In some embodiments, the first pressure information comprises a pressure upstream of the differential pressure sensor
Downstream pressure of the differential pressure sensor
And atmospheric pressure
The second pressure information includes a downstream pressure of the differential pressure sensor
The diagnosing the fault of the particulate matter trap according to the first pressure information and the second pressure information comprises: in the above-mentioned
And the above-mentioned
The difference is greater than a fourth set threshold value, and
and the above-mentioned
And when the absolute value of the difference is smaller than a fifth set threshold value, judging that the upstream differential pressure hose of the differential pressure sensor falls off.
In some embodiments, the method further comprises: if the number of times of falling of the upstream differential pressure hose is larger than a second preset number of times, the upstream differential pressure hose is reported to fall; or if the timing duration of a second timer exceeds a second preset duration, reporting that the upstream differential pressure hose falls off, wherein the second timer is used for increasing the timing by a second set step length each time the upstream differential pressure hose falls off is determined.
In some embodiments, the first pressure information comprises a pressure upstream of the differential pressure sensor
Downstream pressure of the differential pressure sensor
And atmospheric pressure
The second pressure information includes an upstream pressure of the differential pressure sensor
The diagnosing the fault of the particulate matter trap according to the first pressure information and the second pressure information comprises: in the above-mentioned
And the above-mentioned
The difference is greater than a sixth set threshold value, and
and the above-mentioned
And when the absolute value of the difference is smaller than a seventh set threshold value, judging that the downstream differential pressure hose of the differential pressure sensor falls off.
In some embodiments, the method further comprises: if the number of times of falling of the downstream differential pressure hose is larger than a third preset number of times, the falling of the downstream differential pressure hose is reported; or if the timing duration of a third timer exceeds a third preset duration, reporting that the downstream differential pressure hose falls off, wherein the third timer is used for increasing the timing by a third set step length every time the downstream differential pressure hose falls off is judged.
In some embodiments, the first pressure information comprises a pressure upstream of the differential pressure sensor
And the pressure downstream of the differential pressure sensor
The second pressure information includes an upstream pressure of the differential pressure sensor
And the pressure downstream of the differential pressure sensor
The diagnosing the fault of the particulate matter trap according to the first pressure information and the second pressure information comprises: in the above-mentioned
And the above-mentioned
The difference is larger than the eighth set threshold value
And the above-mentioned
The difference is greater than a ninth set threshold value, and
and the above-mentioned
If the absolute value of the difference is less than a tenth predetermined threshold, it is determined that the particulate trap has been removed.
In some embodiments, the method further comprises: if the number of times that the particulate matter trap is removed is larger than a fourth preset number of times, the particulate matter trap is reported to be removed; or if the timing duration of a fourth timer exceeds a fourth preset duration, reporting that the particulate matter trap is removed, wherein the fourth timer is used for increasing the timing by a fourth preset step length each time the particulate matter trap is determined to be removed.
In some embodiments, the method further comprises: in the above-mentioned
And the above-mentioned
The difference is larger than the eighth set threshold value
And the above-mentioned
The difference is greater than a ninth set threshold value, and
and the above-mentioned
And the absolute value of the difference exceeds a tenth set threshold value, and the particulate matter trap and the differential pressure sensor are judged to be fault-free.
In a second aspect, a fault diagnosis device for a particulate matter trap is provided, which can perform the method of the first aspect or any one of the optional embodiments of the first aspect. The function can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more units corresponding to the above functions. The unit may be software and/or hardware.
In a third aspect, an automobile is provided, comprising: a processor and a memory coupled to the processor; wherein the memory comprises computer readable instructions; the processor is configured to execute the computer readable instructions in the memory, thereby causing the vehicle to perform the aspects of the first aspect or any one of the alternative embodiments of the first aspect.
In a fourth aspect, there is provided a computer program product which, when run on a computer, causes the computer to perform the method of the first aspect or any one of the alternative embodiments of the first aspect.
In a fifth aspect, there is provided a chip product for carrying out the method of the first aspect or any one of the alternative embodiments of the first aspect.
A sixth aspect provides a computer-readable storage medium having stored therein instructions, which, when run on a computer, cause the computer to perform the method of the first aspect or any one of the alternative embodiments of the first aspect.
Drawings
Fig. 1 is a schematic structural diagram of a system according to an embodiment of the present disclosure.
FIG. 2 is a schematic flow chart illustrating a method for diagnosing a fault in a particulate trap according to an embodiment of the present disclosure.
Fig. 3 is a schematic waveform diagram of differential pressure signals when a differential pressure hose is inverted according to an embodiment of the present application.
FIG. 4 is a schematic flow chart diagram illustrating another method for diagnosing a fault in a particulate trap, according to an embodiment of the present disclosure.
Fig. 5 is a schematic waveform diagram of pressure difference signals when an upstream pressure difference hose falls off according to an embodiment of the present application.
Fig. 6 is a waveform diagram of differential pressure signals when a downstream differential pressure hose falls off according to an embodiment of the present disclosure.
Fig. 7 is a schematic waveform diagram of differential pressure signals when the GPF is removed according to an embodiment of the present application.
Fig. 8 is a schematic waveform diagram of differential pressure signals in the absence of a fault according to an embodiment of the present application.
FIG. 9 is a schematic structural diagram of a fault diagnosis device of a particulate matter trap according to an embodiment of the present disclosure.
Fig. 10 is a schematic structural diagram of an automobile according to an embodiment of the present application.
Detailed Description
Specific embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
The application provides a fault diagnosis method of a particulate matter trap, which comprises the steps of acquiring first pressure information related to a differential pressure sensor after an automobile is started when the differential pressure sensor has no fault, and then carrying out fault diagnosis on the particulate matter trap according to the first pressure information; therefore, the first pressure information is directly used as input to diagnose the fault of the particulate matter trap, and the influences of factors such as the sampling positions of the upstream and downstream differential pressure hoses of the differential pressure sensor and the calibration precision of the GPF exhaust temperature model in the prior art are eliminated, so that the problems that the GPF diagnosis precision is not high, and the GPF fault is easy to be missed or misjudged in the prior art can be solved.
Referring to fig. 1, fig. 1 is a schematic diagram of a system structure provided in the present application. The system 100 shown in FIG. 1 includes: a particulate trap 101, a differential pressure sensor 102, an upstream differential pressure hose 103, and a downstream differential pressure hose 104. The differential pressure sensor 102 is connected to an air inlet of the particle catcher 101 through an upstream differential pressure hose 103, and is connected to an air outlet of the particle catcher 101 through a downstream differential pressure hose 104. Differential pressure sensor 102 is used to collect the pressure of the exhaust in upstream differential pressure hose 103, referred to simply as the upstream pressure of differential pressure sensor 102, and is also used to collect the pressure of the exhaust in downstream differential pressure hose 104, referred to simply as the downstream pressure of differential pressure sensor 102. The differential pressure sensor 102 used in the present application may specifically be a double absolute pressure differential pressure sensor, and the collected pressures in the upstream differential pressure hose 103 and the downstream differential pressure hose 104 are both absolute pressures.
Referring to fig. 2, fig. 2 is a schematic flow chart illustrating a method for diagnosing a malfunction of a particulate matter trap according to an embodiment of the present disclosure. The method shown in fig. 2 comprises:
s201, when the differential pressure sensor has no fault, acquiring first pressure information related to the differential pressure sensor after the automobile is started.
When the automobile judges that the circuit related to the differential pressure sensor has no circuit fault or communication fault, the automobile can acquire first pressure information after the automobile is started. The first pressure information specifically refers to pressure information associated with the pressure sensor, which may include, but is not limited to, a pressure upstream of the differential pressure sensor
Downstream pressure of differential pressure sensor
And atmospheric pressure
Upstream and downstream pressure differences optionally also including a pressure difference sensor
And (4) waiting for pressure information.
And S202, carrying out fault diagnosis on the particulate matter trap according to the first pressure information.
In one example, the first pressure information includes a pressure upstream of the differential pressure sensor
Downstream pressure of differential pressure sensor
And atmospheric pressure
If it is
And
difference of difference
Is greater than a first set threshold value and,
and
difference of difference
Is greater than a second set threshold value, and
and
difference of difference
And if the pressure difference is smaller than the third set threshold value, the upstream pressure difference hose and the downstream pressure difference hose of the pressure difference sensor are judged to be connected reversely. At this time, the first timer (upstream and downstream differential pressure hose inverse fault timer) T1Increasing by a first set step size. The pressure difference signal fluctuates again along with the fluctuation of the rotating speed of the engine in the normal driving process of the automobile, and once the system detects that the pressure difference signal fluctuates every time
And
difference of difference
Is greater than a first set threshold value and,
and
difference of difference
Is greater than a second set threshold value, and
and
difference of difference
And when the first timer is smaller than the third set threshold, the first timer is continuously increased by the first set step length. When the timing duration of the first timer reaches a first preset duration, the upstream differential pressure hose and the downstream differential pressure hose of the differential pressure sensor are reported to be reversely connected. Or judging that the upstream differential pressure hose and the downstream differential pressure hose of the differential pressure sensor are reversely connected within the first duration to reach a first preset number, and reporting that the upstream differential pressure hose and the downstream differential pressure hose of the differential pressure sensor are reversely connected. Therefore, the probability of reverse misjudgment of the upstream differential pressure hose and the downstream differential pressure hose of the differential pressure sensor can be avoided, and the precision of GPF fault diagnosis is improved. Wherein the first duration is greater than or equal to a first preset duration.
FIG. 3 is a schematic diagram showing the differential pressure signals when the upstream differential pressure hose and the downstream differential pressure hose of the differential pressure sensor are connected in reverse. As in fig. 3, a curve (1) represents a fluctuation pattern of the engine speed. Curve (2) represents the atmospheric pressure
Schematic diagram of the fluctuation. Curve (3) represents the downstream pressure of the differential pressure sensor
Schematic diagram of the fluctuation. Curve (4) represents the upstream pressure of the differential pressure sensor
Schematic diagram of the fluctuation. Curve (5) shows differential pressure sensingPressure difference between upstream and downstream of the device
Schematic diagram of the fluctuation.
As shown in FIG. 3, if the upstream and downstream differential pressure hoses of the differential pressure sensor are reversed and there is no circuit failure or communication failure in the differential pressure sensor, the vehicle starts
The engine speed is slightly changed along with the upward change of the engine speed, and the change trend is consistent with the engine speed.
And the trend of change is opposite to the engine speed. As shown in FIG. 3, the abscissa represents time and the ordinate has three, wherein the first ordinate (-80-10) represents the pressure difference between the upstream and downstream of the curve (5) differential pressure sensor
The value range of (a). And the second ordinate (930-1050) represents the value ranges of the upstream pressure, the downstream pressure and the atmospheric pressure of the differential pressure sensors from the curve (2) to the curve (4). And the third ordinate (0-5000) represents the value range of the engine speed of the curve (1).
In the application, the first set threshold, the second set threshold, the third set threshold, the first set step length and the first preset duration can be set by a user of the system, and they can be the same or different, and the application is not limited.
Referring to FIG. 4, FIG. 4 is a schematic flow chart illustrating another method for diagnosing a malfunction of a particulate trap provided herein. The method shown in fig. 4 includes:
s401, when the differential pressure sensor is not in fault, first pressure information related to the differential pressure sensor after the automobile is started is obtained.
And S402, recording second pressure information related to the differential pressure sensor when the automobile is powered on but not started.
When the automobile is powered on but not started, the automobile can record second pressure informationPressure information associated with the differential pressure sensor, which may include, but is not limited to, the pressure upstream of the differential pressure sensor
Downstream pressure of differential pressure sensor
Atmospheric pressure
And upstream and downstream pressure differences of the pressure difference sensor
Where atmospheric pressure may also be referred to as ambient pressure. If the circuit fault and the communication fault of the automobile non-pressure difference sensor exist, the automobile is subjected to the fault
And S403, performing fault diagnosis on the particulate matter trap according to the first pressure information and the second pressure information.
In one example, if the first pressure information includes a pressure upstream of the differential pressure sensor
Downstream pressure
And atmospheric pressure
The second pressure information includes a downstream pressure of the differential pressure sensor
Then is at
And
difference of difference
Is greater than a fourth set threshold value, and
and
absolute value of the difference between
And when the pressure difference is smaller than a fifth set threshold value, judging that the upstream differential pressure hose of the differential pressure sensor falls off. At this time, the second timer (the upstream differential pressure hose drop timer) is incremented by a second set step size. Then, each pressure difference signal fluctuates along with the fluctuation of the rotating speed of the engine in the normal driving process of the vehicle, and once the automobile detects the fluctuation again
Is greater than a fourth set threshold value, and
and when the second timer is less than the fifth set threshold, the second timer continues to increase by a second set step. And when the accumulated timing time of the second timer reaches a second preset time, reporting that the upstream differential pressure hose falls off. Or the falling frequency of the upstream differential pressure hose is greater than a second preset frequency within a second time, and the upstream differential pressure hose is reported to fall. Wherein the second duration is greater than or equal to a second preset duration. Therefore, the drop of the upstream differential pressure hose can be avoided being judged by mistake, and the drop diagnosis accuracy of the upstream differential pressure hose is improved.
Fig. 5 is a schematic diagram showing the fluctuation of the pressure difference signals falling off the upstream pressure difference hose. For the signal diagrams represented by the curves (1) to (5), reference may be made to the related description in fig. 3, which is not repeated herein. In FIG. 5, the upstream differential pressure hose is disconnected, and the circuit fault and the communication fault of the non-differential pressure sensor are generated at the moment, and the automobile is started
And the variation trend is consistent with the engine speed. If at this time
Is greater than a fourth set threshold value, and
and if the pressure difference is smaller than a fifth set threshold value, judging that the upstream differential pressure hose falls off.
In the application, the fourth setting threshold, the fifth setting threshold, the second preset duration and the second setting step length are all set by the system in a self-defined manner, and they may be different from each other, and the application is not limited.
In yet another example, the first pressure information includes a pressure upstream of the differential pressure sensor
Downstream pressure
And atmospheric pressure
The second pressure information includes an upstream pressure of the pressure sensor
In that
And
difference of difference
Is greater than a sixth set threshold value, and
and the above-mentioned
Absolute value of the difference between
And when the pressure difference is smaller than a seventh set threshold value, judging that the downstream pressure difference hose of the pressure difference sensor falls off. At this time the third timer (downstream differential pressure hose drop timer) increments by a third set step. Then, each pressure difference signal fluctuates along with the fluctuation of the rotating speed of the engine in the normal driving process of the vehicle, and once the automobile detects the fluctuation again
Is greater than a sixth set threshold value, and
and when the accumulated timing duration of the third timer exceeds a third preset duration, the downstream differential pressure hose is reported to fall off. Or the falling frequency of the downstream differential pressure hose exceeds a third preset frequency within a third time, and the falling of the downstream differential pressure hose is reported. The third duration is greater than or equal to a third preset duration. Therefore, the conditions such as the falling misjudgment of the downstream differential pressure hose and the like can be avoided, and the accuracy of the falling diagnosis of the downstream differential pressure hose is improved.
Fig. 6 is a schematic diagram showing the fluctuation of the differential pressure signals after the downstream differential pressure hose falls off. For the signal diagrams represented by the curves (1) to (5), reference may be made to the related description in fig. 3, which is not repeated herein. In FIG. 6, the upstream differential pressure hose is disconnected, and there is no circuit fault and communication fault of the differential pressure sensor at this time, and the automobile is started
And trend and onsetThe rotating speeds of the machines are consistent. If at this time
Is greater than a sixth set threshold value, and
and if the pressure difference is smaller than the seventh set threshold value, judging that the downstream pressure difference hose of the pressure difference sensor falls off.
In yet another example, the first pressure information includes a pressure upstream of the differential pressure sensor
And downstream pressure
The second pressure information includes an upstream pressure of the pressure sensor
And downstream pressure
If it is
And the description
Difference of difference
Is greater than the eighth set threshold value,
And
difference of difference
Is greater than the ninth set threshold value, and
and
absolute value of the difference between
Less than a tenth set threshold, the particulate trap is determined to have been removed. At this point the fourth timer (GPF remove fault timer) is incremented by a fourth preset step size. Then, each pressure difference signal fluctuates along with the fluctuation of the rotating speed of the engine in the normal driving process of the vehicle, and once the automobile detects the fluctuation again
Is greater than the eighth set threshold value,
Is greater than the ninth set threshold value, and
and when the fourth preset step length is smaller than the tenth preset threshold value, the fourth timer keeps increasing and counting by a fourth preset step length. And when the accumulated time of the fourth timer reaches a fourth preset time, reporting that the particle trap GPF is removed. Or the number of times that the particle trap GPF is removed is judged to exceed the fourth preset number within the fourth preset time length, and the GPF is reported to be removed.
Optionally, in
Is greater than the eighth set threshold value,
Is greater than the ninth set threshold value, and
when the tenth set threshold is exceeded, it may be determined that a particulate trap GPF is present. At this time the fifth timer (non-failure timer) is incremented by the fifth set step sizeAnd when the accumulated timing duration of the fifth timer reaches a certain threshold, removing the GPF to finish the fault-free diagnosis.
FIG. 7 is a diagram showing the fluctuation of the differential pressure signals during GPF removal. For the signal diagrams represented by the curves (1) to (5), reference may be made to the related description in fig. 3, which is not repeated herein. In fig. 7, if the automobile has no pressure difference sensor circuit failure, communication failure and pressure difference hose failure after the automobile is started,
as the fluctuation of the engine speed is varied in the positive direction,
very small near 0. Then the automobile is driven normally along with the fluctuation of the engine speed if
Is greater than the eighth set threshold value,
Is greater than the ninth set threshold value, and
less than the tenth set threshold, it is determined that the GPF has been removed.
In yet another example, please refer to fig. 8, which shows a schematic diagram of the fluctuation of the differential pressure signals in the absence of a fault. For the signal diagrams represented by the curves (1) to (5), reference may be made to the related description in fig. 3, which is not repeated herein. In fig. 8, when the vehicle starts, the engine speed rapidly rises and then falls, the exhaust gas flows through the particulate matter trap GPF to generate pressure fluctuation, and if the circuit, the communication and the differential pressure hose of the non-differential pressure sensor fail,
and
is obviously raisedFall back, the variation trend is consistent with the engine speed, and
if at this time
Greater than the eleventh set threshold value,
And if the difference is larger than the twelfth set threshold, judging that the differential pressure sensor and the GPF are not in fault, and triggering the non-fault timer T to increase by a sixth set step length. The pressure difference signal fluctuates again along with the fluctuation of the rotating speed of the engine in the normal driving process of the automobile, and once the automobile detects the fluctuation again
Greater than the eleventh set threshold value,
And if the accumulated timing duration of the non-fault timer reaches the sixth preset duration, completing the non-fault diagnosis.
It should be noted that the first to twelfth set thresholds related to the present application are all set by the system in a self-defined manner, or are empirical values set by the user according to experience, and they may be the same or different, and the present application is not limited.
Through implementing this application, can clear away the influence of sampling position unreasonable, the exhaust temperature model calibration deviation scheduling factor of GPF differential pressure hose among the prior art to the diagnostic result, this application only needs differential pressure sensor operation normal can accurately discern differential pressure hose and drops, connect conversely promptly GPF and remove failures such as, recognition efficiency has very big amplitude promotion. Therefore, the problems that the GPF diagnosis precision is not high, the fault of the GPF is easy to be judged by mistake or is not judged by mistake and the like in the prior art can be solved.
Referring to FIG. 9, FIG. 9 is a schematic structural diagram of a fault diagnostic device of a particulate trap according to the present disclosure. The malfunction diagnosis device 900 of the particulate matter trap shown in fig. 9 includes an acquisition unit 901 and a diagnosis unit 902. The air inlet of the particulate matter catcher is connected with the differential pressure sensor through an upstream differential pressure hose, and the air outlet of the particulate matter catcher is connected with the differential pressure sensor through a downstream differential pressure hose. The particulate matter trap fault diagnosis device 900 can implement the particulate matter trap fault diagnosis method of the present application described above.
The obtaining unit 901 is configured to obtain first pressure information related to the differential pressure sensor after the automobile is started when the differential pressure sensor is not in fault, where the first pressure information includes an upstream pressure of the differential pressure sensor
Downstream pressure of the differential pressure sensor
And the atmospheric pressure in the environment surrounding the particulate trap
The diagnosing unit 902 is configured to perform fault diagnosis on the particulate trap according to the first pressure information.
In some embodiments, the obtaining unit 901 is further configured to record second pressure information related to the differential pressure sensor when the vehicle is not powered on and started; the diagnostic unit 902 is specifically configured to perform a fault diagnosis on the particulate trap based on the first pressure information and the second pressure information.
In some embodiments, the first pressure information comprises a pressure upstream of the differential pressure sensor
Downstream pressure of the differential pressure sensor
And atmospheric pressure
The diagnostic unit 902 is particularly useful in the context of the present invention
And the above-mentioned
The difference is greater than a first set threshold value, the
And the above-mentioned
The difference is greater than a second set threshold value, and
and the above-mentioned
And when the difference is smaller than a third set threshold value, judging that the upstream differential pressure hose and the downstream differential pressure hose of the differential pressure sensor are reversely connected.
In some embodiments, the fault diagnosis device 900 further comprises a reporting unit 903. The reporting unit 903 is specifically configured to report that the upstream differential pressure hose and the downstream differential pressure hose of the differential pressure sensor are reversely connected and failed if the number of times of reversely connecting the upstream differential pressure hose and the downstream differential pressure hose of the differential pressure sensor determined within the first duration reaches a first preset number of times; alternatively, the fault diagnosis device 900 further includes a first timer (not shown) and a reporting unit 903, and if the timed duration of the first timer exceeds a first preset duration, the reporting unit 903 reports reverse faults of the upstream differential pressure hose and the downstream differential pressure hose of the differential pressure sensor; the first timer is used for increasing the time in a first set step when the upstream differential pressure hose and the downstream differential pressure hose of the differential pressure sensor are reversely connected.
In some embodiments, the first pressure information comprises a pressure difference between the first pressure and the second pressureUpstream pressure
Downstream pressure of the differential pressure sensor
And atmospheric pressure
The second pressure information includes a downstream pressure of the differential pressure sensor
The diagnostic unit 902 is particularly useful in the context of the present invention
And the above-mentioned
The difference is greater than a fourth set threshold value, and
and the above-mentioned
And when the absolute value of the difference is smaller than a fifth set threshold value, judging that the upstream differential pressure hose of the differential pressure sensor falls off.
In some embodiments, the reporting unit 903 is further configured to report the upstream differential pressure hose falling fault of the differential pressure sensor if the number of times of the upstream differential pressure hose falling determined within the second time period is greater than a second preset number of times; alternatively, the fault diagnosis apparatus 900 further includes a second timer (not shown) which reports the upstream differential pressure hose drop fault of the differential pressure sensor if the timing duration of the second timer exceeds a second preset duration, wherein the second timer is used for increasing the timing in a second set step every time it is determined that the upstream differential pressure hose drops.
In some embodiments, the first pressure information comprisesUpstream pressure of the differential pressure sensor
Downstream pressure of the differential pressure sensor
And atmospheric pressure
The second pressure information includes an upstream pressure of the differential pressure sensor
The diagnostic unit 902 is particularly useful in the context of the present invention
And the above-mentioned
The difference is greater than a sixth set threshold value, and
and the above-mentioned
And when the absolute value of the difference is smaller than a seventh set threshold value, judging that the downstream differential pressure hose of the differential pressure sensor falls off.
In some embodiments, the reporting unit 903 is further configured to report a downstream differential pressure hose falling fault of the differential pressure sensor if the number of times of falling of the downstream differential pressure hose determined in the third time period is greater than a third preset number of times; alternatively, the fault diagnosis apparatus 900 further includes a third timer (not shown) that reports the downstream differential pressure hose drop fault of the differential pressure sensor if a timing length of the third timer exceeds a third preset length, where the third timer is configured to increase the timing by a third set step length each time it is determined that the downstream differential pressure hose drops.
In some embodiments of the present invention, the,the first pressure information includes an upstream pressure of the differential pressure sensor
And the pressure downstream of the differential pressure sensor
The second pressure information includes an upstream pressure of the differential pressure sensor
And the pressure downstream of the differential pressure sensor
The diagnostic unit 902 is particularly useful in the context of the present invention
And the above-mentioned
The difference is larger than the eighth set threshold value
And the above-mentioned
The difference is greater than a ninth set threshold value, and
and the above-mentioned
If the absolute value of the difference is less than a tenth predetermined threshold, it is determined that the particulate trap has been removed.
In some embodiments, the reporting unit 903 is further configured to report a carrier removal fault of the particulate trap if the number of times that the particulate trap has been removed is greater than a fourth preset number of times, which is determined within a fourth duration; alternatively, the fault diagnosis device 900 further includes a fourth timer (not shown) that reports the carrier removal fault of the particulate trap if the timing length of the fourth timer exceeds a fourth preset length, wherein the fourth timer is used for increasing the timing by a fourth preset step length each time the particulate trap is determined to be removed.
In some embodiments, the diagnostic unit 902 is also specifically used in the system
And the above-mentioned
The difference is larger than the eighth set threshold value
And the above-mentioned
The difference is greater than a ninth set threshold value, and
and the above-mentioned
And the absolute value of the difference exceeds a tenth set threshold value, and the particulate matter trap and the differential pressure sensor are judged to be fault-free.
Through implementing this application, can clear away the influence of sampling position unreasonable, the exhaust temperature model calibration deviation scheduling factor of GPF differential pressure hose among the prior art to the diagnostic result, this application only needs differential pressure sensor operation normal can accurately discern differential pressure hose and drops, connect conversely promptly GPF and remove failures such as, recognition efficiency has very big amplitude promotion. Therefore, the problems that the GPF diagnosis precision is not high, the fault of the GPF is easy to be judged by mistake or is not judged by mistake and the like in the prior art can be solved.
Please refer to fig. 10, which is a schematic structural diagram of an automobile according to an embodiment of the present application. The automobile 1000 shown in fig. 10 includes: a particulate matter trap; a differential pressure sensor; at least one input device 1001; at least one output device 1002; at least one processor 1003, such as a CPU; and a memory 1004, and the input device 1001, the output device 1002, the processor 1003, and the memory 1004 are connected by a bus 1005. Wherein the air inlet of the particulate matter catcher is connected with the differential pressure sensor through an upstream differential pressure hose, and the air outlet of the particulate matter catcher is connected with the differential pressure sensor through a downstream differential pressure hose. The input device 1001 may be a touch panel of a mobile terminal, and includes a touch screen and a touch screen, and is configured to detect an operation instruction on the touch panel of the terminal.
The output device 1002 may be a display screen of the mobile terminal, and is used for outputting and displaying information.
The memory 1004 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1004 is used for storing a set of program codes, and the input device 1001, the output device 1002 and the processor 1003 are used for calling the program codes stored in the memory 1004 to execute the following operations:
the processor 1003 is configured to obtain first pressure information related to the differential pressure sensor after the automobile is started when the differential pressure sensor is not in fault; and performing fault diagnosis on the particulate matter trap according to the first pressure information.
In some embodiments, the processor 1003 is further configured to record second pressure information associated with the differential pressure sensor when the vehicle is not powered on and not started; and performing fault diagnosis on the particulate matter trap according to the first pressure information and the second pressure information.
In some embodiments, the first pressure information comprises a pressure upstream of the differential pressure sensor
Downstream pressure of the differential pressure sensor
And atmospheric pressure
The processor 1003 is particularly adapted to be used in the description
And the above-mentioned
The difference is greater than a first set threshold value, the
And the above-mentioned
The difference is greater than a second set threshold value, and
and the above-mentioned
And when the difference is smaller than a third set threshold value, judging that the upstream differential pressure hose and the downstream differential pressure hose of the differential pressure sensor are reversely connected.
In some embodiments, the processor 1003 is further configured to report that the upstream differential pressure hose of the differential pressure sensor is inverted with respect to the downstream differential pressure hose if the number of times that the upstream differential pressure hose of the differential pressure sensor is inverted with respect to the downstream differential pressure hose is determined within the first duration reaches a first preset number; or,
if the timing duration of the first timer exceeds a first preset duration, reporting that an upstream differential pressure hose and a downstream differential pressure hose of the differential pressure sensor are reversely connected; the first timer is used for increasing the time in a first set step when the upstream differential pressure hose and the downstream differential pressure hose of the differential pressure sensor are reversely connected.
In some embodiments, the first pressure information comprises a pressure upstream of the differential pressure sensor
Downstream pressure of the differential pressure sensor
And atmospheric pressure
The second pressure information includes a downstream pressure of the differential pressure sensor
The processor 1003 is also used for controlling the operation in the above
And the above-mentioned
The difference is greater than a fourth set threshold value, and
and the above-mentioned
And when the absolute value of the difference is smaller than a fifth set threshold value, judging that the upstream differential pressure hose of the differential pressure sensor falls off.
In some embodiments, the processor 1003 is further configured to report that the upstream differential pressure hose falls off if the number of times of the upstream differential pressure hose falls off determined within the second time period is greater than a second preset number of times; or if the timing duration of a second timer exceeds a second preset duration, reporting that the upstream differential pressure hose falls off, wherein the second timer is used for increasing the timing by a second set step length each time the upstream differential pressure hose falls off is determined.
In some embodiments, the first pressure information comprises a pressure upstream of the differential pressure sensor
Downstream pressure of the differential pressure sensor
And atmospheric pressure
The second pressure information includes an upstream pressure of the differential pressure sensor
The processor 1003 is particularly adapted to be used in the description
And the above-mentioned
The difference is greater than a sixth set threshold value, and
and the above-mentioned
And when the absolute value of the difference is smaller than a seventh set threshold value, judging that the downstream differential pressure hose of the differential pressure sensor falls off.
In some embodiments, the processor 1003 is further configured to report that the downstream differential pressure hose falls if the number of times of the downstream differential pressure hose falls is greater than a third preset number of times, which is determined within a third time period; or,
and if the timing duration of a third timer exceeds a third preset duration, reporting that the downstream differential pressure hose falls off, wherein the third timer is used for increasing the timing by a third set step length when the downstream differential pressure hose falls off is judged every time.
In some embodiments, the first pressure information comprises a pressure upstream of the differential pressure sensor
And the pressure downstream of the differential pressure sensor
The second pressure information includes an upstream pressure of the differential pressure sensor
And the pressure downstream of the differential pressure sensor
The processor 1003 is particularly adapted to be used in the description
And the above-mentioned
The difference is larger than the eighth set threshold value
And the above-mentioned
The difference is greater than a ninth set threshold value, and
and the above-mentioned
If the absolute value of the difference is less than a tenth predetermined threshold, it is determined that the particulate trap has been removed.
In some embodiments, the processor 1003 is further configured to report that the particulate trap has been removed if the number of times the particulate trap has been removed determined within the fourth duration is greater than a fourth predetermined number of times; or,
and if the timing duration of a fourth timer exceeds a fourth preset duration, reporting a carrier removal fault of the particulate matter trap, wherein the fourth timer is used for increasing the timing by a fourth preset step length each time the particulate matter trap is determined to be removed.
In some embodiments, the processor 1003 is also configured to perform the operations described herein
And the above-mentioned
The difference is larger than the eighth set threshold value
And the above-mentioned
The difference is greater than a ninth set threshold value, and
and the above-mentioned
And the absolute value of the difference exceeds a tenth set threshold value, and the particulate matter trap and the differential pressure sensor are judged to be fault-free.
Based on the same inventive concept, the principle of solving the problem by the terminal provided in the embodiment of the present application is similar to the principle of solving the problem by the terminal in the embodiment of the method of the present application, so that the implementation of each device may refer to the implementation of the method, and is not described herein again for brevity.
It should be noted that, in the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to relevant descriptions of other embodiments for parts that are not described in detail in a certain embodiment.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs.
The modules in the terminal equipment of the embodiment of the invention can be merged, divided and deleted according to actual needs.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (14)
1. A fault diagnosis method of a particulate trap, wherein an air inlet of the particulate trap is connected with a differential pressure sensor through an upstream differential pressure hose, and an air outlet of the particulate trap is connected with the differential pressure sensor through a downstream differential pressure hose, the fault diagnosis method of the particulate trap comprises the following steps:
when the differential pressure sensor is not in fault, acquiring first pressure information related to the differential pressure sensor after the automobile is started, wherein the first pressure information comprises the upstream pressure of the differential pressure sensor
Downstream pressure of the differential pressure sensor
And the atmospheric pressure in the environment surrounding the particulate trap
And performing fault diagnosis on the particulate matter trap according to the first pressure information.
2. The method of claim 1, wherein the method of diagnosing a malfunction of the particulate trap further comprises:
recording second pressure information related to the differential pressure sensor when the automobile is not started after being electrified;
the diagnosing the fault of the particulate matter trap according to the first pressure information comprises:
and performing fault diagnosis on the particulate matter trap according to the first pressure information and the second pressure information.
3. The method of claim 1,
the diagnosing the fault of the particulate matter trap according to the first pressure information comprises:
in the above-mentioned
And the above-mentioned
The difference is greater than a first set threshold value, the
And the above-mentioned
The difference is greater than a second set threshold value, and
and the above-mentioned
And when the difference is smaller than a third set threshold value, judging that the upstream differential pressure hose and the downstream differential pressure hose of the differential pressure sensor are reversely connected.
4. The method of claim 3, wherein the method of diagnosing a malfunction of the particulate trap further comprises:
if the number of times of connecting the upstream differential pressure hose and the downstream differential pressure hose of the differential pressure sensor in an inverse manner within the first duration reaches a first preset number, reporting that the upstream differential pressure hose and the downstream differential pressure hose of the differential pressure sensor are in inverse failure; or,
if the timing duration of the first timer exceeds a first preset duration, reporting reverse faults of an upstream differential pressure hose and a downstream differential pressure hose of the differential pressure sensor; the first timer is used for increasing the time in a first set step when the upstream differential pressure hose and the downstream differential pressure hose of the differential pressure sensor are reversely connected.
5. The method of claim 2, wherein the second pressure information comprises a pressure downstream of the differential pressure sensor when the vehicle is not powered on and not started
The diagnosing the fault of the particulate matter trap according to the first pressure information and the second pressure information comprises:
in the above-mentioned
And the above-mentioned
The difference is greater than a fourth set threshold value, and
and the above-mentioned
And when the absolute value of the difference is smaller than a fifth set threshold value, judging that the upstream differential pressure hose of the differential pressure sensor falls off.
6. The method of claim 5, wherein the method of diagnosing a malfunction of the particulate trap further comprises:
if the number of times of falling of the upstream differential pressure hose is larger than a second preset number of times, the falling fault of the upstream differential pressure hose of the differential pressure sensor is reported; or,
and if the timing duration of a second timer exceeds a second preset duration, reporting the falling fault of the upstream differential pressure hose of the differential pressure sensor, wherein the second timer is used for increasing the timing by a second set step length when the upstream differential pressure hose falls off is judged every time.
7. The method of claim 2, wherein the second pressure information comprises a pressure upstream of the differential pressure sensor when the vehicle is not powered on and not started
The diagnosing the fault of the particulate matter trap according to the first pressure information and the second pressure information comprises:
in the above-mentioned
And the above-mentioned
The difference is greater than a sixth set threshold value, and
and the above-mentioned
And when the absolute value of the difference is smaller than a seventh set threshold value, judging that the downstream differential pressure hose of the differential pressure sensor falls off.
8. The method of claim 7, wherein the method for diagnosing a malfunction of the particulate trap further comprises:
if the number of times of falling of the downstream differential pressure hose is larger than a third preset number of times, the falling fault of the downstream differential pressure hose of the differential pressure sensor is reported; or,
and if the timing duration of a third timer exceeds a third preset duration, reporting the falling fault of the downstream differential pressure hose of the differential pressure sensor, wherein the third timer is used for increasing the timing by a third set step length when the downstream differential pressure hose falls off is judged every time.
9. The method of claim 2, wherein the second pressure information comprises a pressure upstream of the differential pressure sensor when the vehicle is not powered on and not started
And the pressure downstream of the differential pressure sensor
The diagnosing the fault of the particulate matter trap according to the first pressure information and the second pressure information comprises:
in the above-mentioned
And the above-mentioned
The difference is larger than the eighth set threshold value
And the above-mentioned
The difference is greater than a ninth set threshold value, and
and the above-mentioned
If the absolute value of the difference is less than a tenth predetermined threshold, it is determined that the particulate trap has been removed.
10. The method of claim 9, wherein the method of diagnosing a malfunction of the particulate trap further comprises:
if the number of times that the particulate matter trap is removed is larger than a fourth preset number of times, reporting a carrier removal fault of the particulate matter trap; or,
and if the timing duration of a fourth timer exceeds a fourth preset duration, reporting a carrier removal fault of the particulate matter trap, wherein the fourth timer is used for increasing the timing by a fourth preset step length each time the particulate matter trap is determined to be removed.
11. The method of claim 9, further comprising:
in the above-mentioned
And the above-mentioned
The difference is larger than the eighth set threshold value
And the above-mentioned
The difference is greater than a ninth set threshold value, and
and the above-mentioned
And the absolute value of the difference exceeds a tenth set threshold value, and the particulate matter trap and the differential pressure sensor are judged to be fault-free.
12. A fault diagnosis device of a particulate matter trap is characterized by comprising an acquisition unit and a diagnosis unit, wherein an air inlet of the particulate matter trap is connected with a differential pressure sensor through an upstream differential pressure hose, an air outlet of the particulate matter trap is connected with the differential pressure sensor through a downstream differential pressure hose,
the acquisition unit is used for acquiring first pressure information related to the differential pressure sensor after the automobile is started when the differential pressure sensor has no fault, and the first pressure information comprises upstream pressure of the differential pressure sensor
Downstream pressure of the differential pressure sensor
And the atmospheric pressure in the environment surrounding the particulate trap
And the diagnosis unit is used for carrying out fault diagnosis on the particulate matter trap according to the first pressure information.
13. An automobile, comprising: the particle trap, the processor, the memory and the differential pressure sensor are connected with the processor; the air inlet of the particle trap is connected with the differential pressure sensor through an upstream differential pressure hose, the air outlet of the particle trap is connected with the differential pressure sensor through a downstream differential pressure hose, the memory comprises computer readable instructions, and the processor is used for executing the computer readable instructions in the memory to realize the method as claimed in any one of the claims 1-11.
14. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program comprising program instructions that, when executed by a processor, cause the processor to carry out the method according to any one of claims 1 to 11.
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