CN114738097B - DPF trapping efficiency monitoring method and device and vehicle - Google Patents

DPF trapping efficiency monitoring method and device and vehicle Download PDF

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Publication number
CN114738097B
CN114738097B CN202210493148.8A CN202210493148A CN114738097B CN 114738097 B CN114738097 B CN 114738097B CN 202210493148 A CN202210493148 A CN 202210493148A CN 114738097 B CN114738097 B CN 114738097B
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dpf
trapping efficiency
current
preset value
monitoring
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CN114738097A (en
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王佳兴
王素梅
李钊
褚国良
解同鹏
杜慧娟
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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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
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of 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
    • F01N9/00—Electrical control of exhaust gas treating 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/05—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a particulate 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

The invention belongs to the technical field of engine aftertreatment, and discloses a DPF trapping efficiency monitoring method, a device and a vehicle. And determining a third preset value of the DPF upstream and downstream pressure difference of the current monitoring cycle according to the current DPF carbon loading table, if the measured value of the DPF upstream and downstream pressure difference is smaller than the third preset value, the fact that the monitoring cycle is out of expectation in the soot emission is that degradation which can affect the trapping efficiency occurs on the DPF is indicated, so that the DPF trapping efficiency is judged to be low, and the situation that false alarm occurs in a monitoring strategy by singly using a PM sensor is avoided.

Description

DPF trapping efficiency monitoring method and device and vehicle
Technical Field
The invention relates to the technical field of engine aftertreatment, in particular to a DPF trapping efficiency monitoring method and device and a vehicle.
Background
In diesel aftertreatment systems, DPF is required to reduce engine particulate emissions. According to the regulation requirements, the DPF trapping efficiency is monitored in real time. At present, a monitoring strategy of a PM sensor is generally adopted by a diesel vehicle, but when the normal whole vehicle running working condition of a DPF is changed severely or a slight crack appears in the DPF, under the condition that the actual trapping efficiency is not problematic, the PM sensor can misreport the condition that the trapping efficiency of the DPF is low, so that the robustness of the monitoring strategy is reduced.
Disclosure of Invention
The invention aims to provide a DPF trapping efficiency monitoring method, a device and a vehicle, which avoid the situation that false alarm occurs in a monitoring strategy of a PM sensor used independently and improve the robustness of the DPF trapping efficiency monitoring method.
To achieve the purpose, the invention adopts the following technical scheme:
monitoring a DPF carbon loading, an exhaust gas flow rate and a PM sensor temperature, and if the DPF carbon loading, the exhaust gas flow rate and the PM sensor temperature meet a first enabling condition, starting DPF trapping efficiency monitoring of a current monitoring cycle;
the DPF trapping efficiency monitoring includes: the PM sensor starts to measure current, monitors the volume flow of the waste gas and the content of the waste gas, and calculates the cumulative emission of the waste gas in the current monitoring cycle according to the content of the waste gas and the volume flow of the waste gas;
if the accumulated emission of the boot of the current monitoring cycle reaches a first preset value, recording a current measured value of the PM sensor at the moment, and judging a current monitoring result of the PM sensor;
the PM sensor current monitoring result judgment includes: if the current measurement is greater than the second preset value, setting a PM sensor fault state;
the PM sensor fault state setting step further comprises the following steps: monitoring the upstream and downstream differential pressure of the DPF and the temperature of the DPF, if the volume flow of the exhaust gas and the temperature of the DPF meet a second enabling condition, recording a differential pressure measured value of the upstream and downstream of the DPF at the moment, looking up a table according to the current carbon loading of the DPF to determine a third preset value of the upstream and downstream differential pressure of the DPF in the current monitoring cycle, and judging the upstream and downstream differential pressure of the DPF;
the DPF upstream-downstream differential pressure judgment comprises the following steps: and if the differential pressure measured value is smaller than the third preset value, judging that the DPF trapping efficiency is low.
Preferably, if the cumulative emission amount of the boot of the current monitoring cycle does not reach the first preset value when the current monitoring cycle is ended, the DPF trapping efficiency monitoring of the next monitoring cycle is continued.
Preferably, the PM sensor current monitoring result judgment further includes:
and if the current measured value is not greater than the second preset value, judging that the DPF trapping efficiency is normal.
Preferably, the determining of the upstream-downstream differential pressure of the DPF further includes:
and if the differential pressure measured value is not smaller than the third preset value, judging that the DPF trapping efficiency is normal.
Preferably, the first enabling condition includes the DPF carbon loading being within a first preset interval, the exhaust gas flow rate being greater than a fourth preset value, and the PM sensor temperature being greater than a fifth preset value.
Preferably, the second enabling condition includes the exhaust gas volumetric flow being greater than a sixth preset value and the DPF temperature being within a second preset interval.
Preferably, the monitoring cycle is a preset driving range for the vehicle.
Preferably, the calculating the cumulative emission amount of the boot of the current monitoring cycle according to the exhaust gas boot content and the exhaust gas volumetric flow rate includes:
calculating to obtain the quantity of the emission of the waste gas in unit time according to the content of the waste gas and the volume flow of the waste gas;
and integrating the quantity of the shot emission in unit time by taking the time from the start of the current monitoring cycle to the time when the cumulative quantity of the shot emission of the current monitoring cycle reaches a first preset value as an integration interval to obtain the cumulative quantity of the shot emission of the current monitoring cycle.
A DPF trapping efficiency monitoring device that monitors a DPF using the DPF trapping efficiency monitoring method described in any one of the above.
A vehicle that monitors a DPF using the DPF trapping efficiency monitoring method according to any one of the above.
The invention has the beneficial effects that:
in one monitoring cycle, if the accumulated emission quantity of the soot of the current monitoring cycle calculated according to the content of the exhaust gas and the volume flow of the exhaust gas is larger than a first preset value, and the measured value of the current of the PM sensor is larger than a second preset value, the soot emission of the current monitoring cycle is beyond expectations. And determining a third preset value of the DPF upstream and downstream pressure difference of the current monitoring cycle according to the current DPF carbon loading table, if the measured value of the DPF upstream and downstream pressure difference is smaller than the third preset value, the fact that the monitoring cycle is out of expectation is that degradation which can affect the trapping efficiency occurs on the DPF is indicated, so that the DPF trapping efficiency is judged to be low, the situation that false alarm occurs in a monitoring strategy by independently using a PM sensor is avoided, and the robustness of the DPF trapping efficiency monitoring method is improved.
Drawings
Fig. 1 is a flowchart of a DPF trapping efficiency monitoring method provided by an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
As shown in fig. 1, the present embodiment provides a DPF trapping efficiency monitoring method, including:
monitoring a DPF carbon loading, an exhaust gas flow rate and a PM sensor temperature, and if the DPF carbon loading, the exhaust gas flow rate and the PM sensor temperature meet a first enabling condition, starting DPF trapping efficiency monitoring of a current monitoring cycle;
the DPF trapping efficiency monitoring includes: the PM sensor starts to measure current, monitors the volume flow of the waste gas and the content of the waste gas, and calculates the accumulated emission of the waste gas in the current monitoring cycle according to the content of the waste gas and the volume flow of the waste gas;
if the accumulated emission of the boot of the current monitoring cycle reaches a first preset value, recording the current measured value of the PM sensor at the moment, and judging the current monitoring result of the PM sensor;
the PM sensor current monitoring result judgment includes: if the current measurement is greater than the second preset value, setting a PM sensor fault state;
PM sensor fault state still includes after setting: monitoring the upstream and downstream differential pressure of the DPF and the temperature of the DPF, if the volume flow of the exhaust gas and the temperature of the DPF meet the second enabling condition, recording the differential pressure measured value of the upstream and downstream of the DPF at the moment, looking up a table according to the current carbon loading of the DPF to determine a third preset value of the upstream and downstream differential pressure of the DPF of the current monitoring cycle, and judging the upstream and downstream differential pressure of the DPF;
the DPF upstream-downstream differential pressure judgment comprises the following steps: if the differential pressure measurement is less than the third preset value, the DPF trapping efficiency is judged to be low.
In the monitoring cycle of the DPF trapping efficiency monitoring method provided in this embodiment, if the cumulative emission of the soot in the current monitoring cycle calculated according to the exhaust gas soot content and the exhaust gas volumetric flow reaches a first preset value, and the measured value of the current of the PM sensor is greater than a second preset value, it is indicated that the soot emission in the current monitoring cycle exceeds the expected value. And determining a third preset value of the upstream and downstream differential pressure of the DPF of the current monitoring cycle according to the lookup table of the current DPF carbon loading amount, if the measured value of the upstream and downstream differential pressure of the DPF is smaller than the third preset value, the fact that the monitoring cycle is beyond the expected exhaust is that degradation which can affect the trapping efficiency occurs on the DPF, such as cracks, breakage or internal carrier burning of the DPF, is indicated, so that the DPF trapping efficiency is judged to be low, the situation that false alarm occurs in a monitoring strategy by using a PM sensor alone is avoided, and the robustness of the DPF trapping efficiency monitoring method is improved.
Specifically, in this embodiment, the first preset value is a soot emission limit value specified by regulations, and the DPF degradation member having the trapping efficiency lower than the prescribed value is tested by the engine bench, and when the soot accumulated emission amount reaches the first preset value, the current value of the PM sensor is the second preset value. And the limit value of the pressure difference between the upstream and downstream of the DPF under different carbon loadings is measured through the degradation piece, if the pressure difference is lower than the limit value, the degradation of the DPF, such as cracks, breakage or internal carrier burning of the DPF, which can affect the capturing efficiency, is indicated, the limit values of the carbon loadings of the DPF and the pressure difference between the upstream and downstream of the DPF corresponding to the carbon loadings of the DPF are prestored, and each carbon loading of the DPF corresponds to the minimum limit value of the pressure difference between the upstream and downstream of the DPF, which is the third preset value of the pressure difference between the upstream and downstream of the DPF corresponding to the carbon loading of the DPF, so that when the DPF capturing efficiency monitoring method provided by the embodiment is used for monitoring the DPF capturing efficiency, the third preset value of the pressure difference between the upstream and downstream of the DPF in the current monitoring cycle is determined according to the current DPF carbon loading lookup table.
Optionally, determining that the DPF trapping efficiency is low further includes reporting a failure of the DPF trapping efficiency.
Optionally, continuously monitoring the cumulative emission of the boot of the current monitoring cycle in the current monitoring cycle, and if the cumulative emission of the boot of the current monitoring cycle still does not reach the first preset value when the current monitoring cycle is finished, continuing the monitoring of the DPF trapping efficiency of the next monitoring cycle.
Optionally, as shown in fig. 1, the PM sensor current monitoring result determination further includes determining that the DPF trapping efficiency is normal if the current measurement value of the PM sensor is not greater than a second preset value. The current of the PM sensor is not larger than the second preset value, and the reason that the accumulated emission of the boot of the current monitoring cycle reaches the first preset value is that the monitoring value of the waste gas boot content or the waste gas volume flow has errors, and under the condition, the monitoring of the DPF capturing efficiency of the next monitoring cycle is continued.
Optionally, as shown in fig. 1, the determining of the differential pressure between the upstream and downstream of the DPF further includes reporting that the DPF trapping efficiency is normal if the differential pressure measurement value is not less than a third preset value. If the measured value of the differential pressure is not smaller than the third preset value, in the process from the beginning of the current monitoring cycle to the time when the accumulated emission of the current monitoring cycle reaches the first preset value, the newly increased carbon load of the DPF reaches the expected value, namely the third preset value, which indicates that the trapping efficiency of the DPF is not reduced, and the reasons that the accumulated emission of the current monitoring cycle reaches the first preset value and the current of the PM sensor is larger than the second preset value are that the running condition of the whole vehicle is changed severely or the DPF has slight cracks.
Optionally, the first enabling condition includes the DPF carbon loading being within a first preset interval, the exhaust gas flow rate being greater than a fourth preset value, and the PM sensor temperature being greater than a fifth preset value. Specifically, in this embodiment, the first preset interval is 0.5g/l to 4g/l, when the DPF carbon loading is too low, the trapping efficiency of the DPF is not stable, and when the DPF carbon loading is too high, the vehicle is about to regenerate, at this time, the DPF trapping efficiency is not required to be judged any more, and after the vehicle regeneration is completed, the DPF trapping efficiency is continuously monitored; the fourth preset value is 10m/s, and too low an exhaust gas flow rate also affects the measurement accuracy of the PM sensor. The temperature of the PM sensor is greater than a fifth preset value, so as to avoid that the humidity of the surface of the PM sensor is too high to affect the measurement accuracy of the PM sensor, ensure the release of the dew point of the PM sensor, and specifically set the specific temperature value of the fifth preset value according to the model of the selected PM sensor.
Optionally, the second enabling condition comprises exhaust gasThe volumetric flow is larger than the sixth preset value and the DPF temperature is located in the second preset interval, and the unstable pressure difference between the upstream and the downstream of the DPF can be caused by the too low exhaust gas volumetric flow and the too high and the too low DPF temperature, so that the judgment of the DPF trapping efficiency is affected, and the accuracy of the judgment of the DPF trapping efficiency is ensured by limiting the exhaust gas volumetric flow and the DPF temperature. Specifically, in the present embodiment, the second preset interval is 200 ℃ to 500 ℃, and the sixth preset value is 300m 3 And/h. If the exhaust gas volume flow and the DPF temperature do not meet the second enabling condition after the PM sensor fault state is set, waiting for the exhaust gas volume flow and the DPF temperature to meet the second enabling condition, recording the differential pressure measured value of the upstream and downstream of the DPF at the moment, looking up a table according to the carbon load of the DPF at the moment to determine a third preset value of the differential pressure of the upstream and downstream of the DPF in the current monitoring cycle, and judging the differential pressure of the upstream and downstream of the DPF. If the exhaust gas volumetric flow and the DPF temperature do not yet meet the second enabling condition at the end of the current monitoring cycle, DPF trapping efficiency monitoring for the next monitoring cycle is continued.
Optionally, the monitoring cycle is a preset driving range for the vehicle. The soot emission standard is generally the soot emission amount in the unit mileage of the vehicle, so that the DPF trapping efficiency monitoring method can better meet the monitoring requirement of the DPF trapping efficiency by taking a preset driving mileage of the vehicle as a monitoring cycle.
Optionally, calculating the cumulative emission of the boot for the current monitoring cycle from the exhaust boot content and the exhaust volumetric flow comprises:
the method comprises the steps of calculating according to the waste gas boot content and the waste gas volume flow to obtain the boot emission in unit time, specifically, multiplying the boot concentration by the waste gas volume flow to obtain the boot emission in unit time;
and integrating the quantity of the shot emission in unit time by taking the time from the start of the current monitoring cycle to the time when the quantity of the shot accumulated emission of the current monitoring cycle reaches a first preset value as an integration interval to obtain the quantity of the shot accumulated emission of the current monitoring cycle.
The embodiment also provides a device for monitoring the trapping efficiency of the DPF, which monitors the DPF by using the method for monitoring the trapping efficiency of the DPF.
The embodiment also provides a vehicle, and the DPF is monitored by using the DPF trapping efficiency monitoring method.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (8)

1. A DPF trapping efficiency monitoring method, characterized by comprising:
monitoring a DPF carbon loading, an exhaust gas flow rate and a PM sensor temperature, and if the DPF carbon loading, the exhaust gas flow rate and the PM sensor temperature meet a first enabling condition, starting DPF trapping efficiency monitoring of a current monitoring cycle;
the DPF trapping efficiency monitoring includes: the PM sensor starts to measure current, monitors the volume flow of the waste gas and the content of the waste gas, and calculates the cumulative emission of the waste gas in the current monitoring cycle according to the content of the waste gas and the volume flow of the waste gas;
if the accumulated emission of the boot of the current monitoring cycle reaches a first preset value, recording a current measured value of the PM sensor at the moment, and judging a current monitoring result of the PM sensor;
the PM sensor current monitoring result judgment includes: if the current measured value is greater than a second preset value, setting a PM sensor fault state;
the PM sensor fault state setting step further comprises the following steps: monitoring the upstream and downstream differential pressure of the DPF and the temperature of the DPF, if the volume flow of the exhaust gas and the temperature of the DPF meet a second enabling condition, recording a differential pressure measured value of the upstream and downstream of the DPF at the moment, looking up a table according to the current carbon loading of the DPF to determine a third preset value of the upstream and downstream differential pressure of the DPF in the current monitoring cycle, and judging the upstream and downstream differential pressure of the DPF;
the DPF upstream-downstream differential pressure judgment comprises the following steps: if the differential pressure measured value is smaller than the third preset value, judging that the DPF trapping efficiency is low;
the first enabling condition includes the DPF carbon loading being within a first preset interval, the exhaust gas flow rate being greater than a fourth preset value, and the PM sensor temperature being greater than a fifth preset value;
the second enabling condition includes the exhaust gas volumetric flow being greater than a sixth preset value and the DPF temperature being within a second preset interval.
2. The DPF trapping efficiency monitoring method according to claim 1, wherein if the cumulative quantity of the soot discharged by the current monitoring cycle does not reach a first preset value at the end of the current monitoring cycle, DPF trapping efficiency monitoring of the next monitoring cycle is continued.
3. The DPF trapping efficiency monitoring method according to claim 1, wherein the PM sensor current monitoring result judgment further includes:
and if the current measured value is not greater than a second preset value, judging that the DPF trapping efficiency is normal.
4. The DPF trapping efficiency monitoring method according to claim 1, wherein the DPF upstream-downstream differential pressure judgment further includes:
and if the differential pressure measured value is not smaller than the third preset value, judging that the DPF trapping efficiency is normal.
5. The method of claim 1, wherein the monitoring cycle is a predetermined range for the vehicle.
6. The DPF trapping efficiency monitoring method according to claim 1, wherein the calculating the cumulative emission amount of the soot of the current monitoring cycle from the exhaust gas soot content and the exhaust gas volumetric flow rate includes:
calculating to obtain the quantity of the emission of the waste gas in unit time according to the content of the waste gas and the volume flow of the waste gas;
and integrating the quantity of the shot emission in unit time by taking the time from the start of the current monitoring cycle to the time when the cumulative quantity of the shot emission of the current monitoring cycle reaches a first preset value as an integration interval to obtain the cumulative quantity of the shot emission of the current monitoring cycle.
7. A DPF trapping efficiency monitoring device characterized in that a DPF is monitored using the DPF trapping efficiency monitoring method according to any one of claims 1 to 6.
8. A vehicle characterized in that the DPF is monitored using the DPF trapping efficiency monitoring method according to any one of claims 1 to 6.
CN202210493148.8A 2022-05-07 2022-05-07 DPF trapping efficiency monitoring method and device and vehicle Active CN114738097B (en)

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CN113719336B (en) * 2021-08-06 2022-12-09 中国重汽集团济南动力有限公司 Method and system for improving measurement precision of vehicle PM sensor
CN113606025B (en) * 2021-08-20 2022-11-22 一汽解放汽车有限公司 Fault diagnosis method for diesel engine DPF trapping efficiency

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