CN114165346A - Precision detection method and system of DPF (diesel particulate filter) differential pressure sensor and storage medium - Google Patents
Precision detection method and system of DPF (diesel particulate filter) differential pressure sensor and storage medium Download PDFInfo
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- CN114165346A CN114165346A CN202010953227.3A CN202010953227A CN114165346A CN 114165346 A CN114165346 A CN 114165346A CN 202010953227 A CN202010953227 A CN 202010953227A CN 114165346 A CN114165346 A CN 114165346A
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- 238000001514 detection method Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 39
- 238000004140 cleaning Methods 0.000 claims abstract description 15
- 239000007789 gas Substances 0.000 claims description 49
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 23
- 229910052799 carbon Inorganic materials 0.000 claims description 23
- 230000008569 process Effects 0.000 claims description 22
- 238000001914 filtration Methods 0.000 claims description 20
- 230000008929 regeneration Effects 0.000 claims description 15
- 238000011069 regeneration method Methods 0.000 claims description 15
- 239000002912 waste gas Substances 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 6
- 230000004044 response Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000007704 transition Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000008571 general function Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
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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
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
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- 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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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
The invention provides a precision detection method and a precision detection system of a DPF (diesel particulate filter) differential pressure sensor and a storage medium, and belongs to the technical field of engines. The method comprises the following steps: when the engine is in a parking state, cleaning the DPF; controlling the engine to perform variable speed operation between a first idle speed and a second idle speed which is larger than the first idle speed, and acquiring measured values of pressure difference between two ends of the DPF, which is measured by a pressure difference sensor under different volume flow rates of the DPF exhaust gas during the variable speed operation of the engine; acquiring calibration values of pressure difference between two ends of the DPF under different DPF exhaust gas volume flow rates determined by calibration under the same working condition; and when the volume flow of the exhaust gas of any DPF is smaller than the first volume flow threshold value or larger than the second volume flow threshold value, comparing the measured value with the pressure difference between two ends of the DPF with a calibration value to judge whether the precision of the DPF pressure difference sensor meets the requirement or not. The embodiment can accurately judge whether the precision of the DPF pressure difference sensor meets the requirement.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a precision detection method and system of a DPF (diesel particulate filter) differential pressure sensor and a storage medium.
Background
At present, an electric control diesel engine adopting DPF technology generally adopts the measured differential pressure of a DPF differential pressure sensor to evaluate the carbon loading of DPF. The specific principle is as follows: when the DPF is under different carbon loading capacity, the pressure difference at two ends of the DPF and the volume flow of the waste gas have a better corresponding relation, and then the carbon loading capacity in the DPF can be well estimated according to the corresponding relation. However, the DPF differential pressure sensor has an accuracy error, and the accuracy error of the differential pressure sensor increases after a period of use. If the error exceeds a certain range, the carbon loading capacity in the judged DPF has obvious errors, so that the engine is frequently regenerated or does not regenerate, faults with excessive carbon loading capacity are reported by mistake, the speed is limited, and a lot of adverse effects are generated.
At present, when a service person in the market checks whether the differential pressure sensor is normal on the whole vehicle, the service person can only detect whether the measurement value of the differential pressure sensor is 0 in a static state or whether the measurement value changes along with the change of the airflow size in a dynamic state, and observe whether a fault code is reported. These measures can only check whether the differential pressure sensor has a fatal fault, but cannot judge whether the measurement accuracy of the differential pressure sensor meets the use requirement.
Disclosure of Invention
The invention mainly aims to provide a precision detection method, a precision detection system and a storage medium of a DPF (diesel particulate filter) differential pressure sensor so as to accurately detect whether the measurement precision of the differential pressure sensor meets the use requirement.
In a first aspect, an embodiment of the present application provides a method for detecting accuracy of a DPF differential pressure sensor, including the following steps: when the engine is in a parking state, controlling the DPF to perform parking regeneration in response to a parking regeneration instruction so as to perform cleaning treatment on the DPF; after the cleaning treatment is carried out on the DPF, controlling the engine to carry out variable-speed operation between a first idling speed and a second idling speed which is larger than the first idling speed, and enabling the volume flow rate of the exhaust gas of the DPF to be smaller than or equal to a preset first volume flow rate threshold value when the engine runs at the first idling speed and enabling the volume flow rate of the exhaust gas of the DPF to be larger than or equal to a preset second volume flow rate threshold value which is larger than the first volume flow rate threshold value when the engine runs at the second idling speed, wherein measurement values of pressure difference between two ends of the DPF, which is measured by a pressure difference sensor under different volume flow rates of the exhaust gas of the DPF, are obtained during the variable-speed operation of the engine; acquiring calibration values of pressure difference between two ends of the DPF under different DPF exhaust gas volume flow rates determined by calibration under the same working condition; and for any DPF exhaust gas volume flow, when the volume flow is smaller than the first volume flow threshold or larger than the second volume flow threshold, comparing the measured value and the calibrated value of the pressure difference between two ends of the DPF corresponding to the DPF exhaust gas volume flow, determining the difference between the measured value and the calibrated value, and judging that the precision of the DPF pressure difference sensor does not meet the requirement when the difference does not meet the preset precision condition.
In one embodiment, the cleaning process includes maintaining the internal carbon loading of the DPF at or below a preset carbon loading and maintaining the DPF at a specified temperature for a preset period of time.
In one embodiment, controlling engine operation at a variable speed between a first idle speed and a second idle speed greater than the first idle speed comprises: controlling the engine to smoothly shift from a first idle speed to a second idle speed during operation; or controlling the engine to alternate and smoothly change between the first idling speed and the second idling speed during the operation process.
In one embodiment, for any DPF exhaust gas volume flow, when the DPF exhaust gas volume flow is smaller than the first volume flow threshold or larger than the second volume flow threshold, comparing a measured value and a calibrated value of a pressure difference between two ends of the DPF corresponding to the DPF exhaust gas volume flow, determining a difference value between the measured value and the calibrated value, and determining that the precision of the DPF differential pressure sensor is not satisfactory when the difference value does not satisfy a preset precision condition, the method comprises the following steps: for any DPF exhaust gas volume flow, when the volume flow is smaller than the first volume flow threshold value, comparing a measured value and a calibrated value of pressure difference between two ends of the DPF corresponding to the DPF exhaust gas volume flow, and determining a difference value between the measured value and the calibrated value; and comparing the difference value with a preset first error threshold value, and when the difference value is greater than the preset first error threshold value, judging that the difference value does not meet a preset precision condition, and further judging that the precision of the DPF pressure difference sensor does not meet the requirement.
In one embodiment, for any DPF exhaust gas volume flow, when the DPF exhaust gas volume flow is smaller than the first volume flow threshold or larger than the second volume flow threshold, comparing a measured value and a calibrated value of a pressure difference between two ends of the DPF corresponding to the DPF exhaust gas volume flow, determining a difference value between the measured value and the calibrated value, and determining that the precision of the DPF differential pressure sensor is not satisfactory when the difference value does not satisfy a preset precision condition, the method comprises the following steps: when the volume flow of the DPF waste gas is larger than a preset second volume flow threshold value, respectively carrying out filtering processing on a measured value and a calibrated value of pressure difference between two ends of the DPF corresponding to the volume flow of the DPF waste gas, comparing the measured value and the calibrated value which are subjected to the filtering processing, and determining a difference value between the measured value and the calibrated value which are subjected to the filtering processing; and comparing the difference value with a preset second error threshold value, and judging that the difference value does not meet a preset precision condition when the difference value is greater than the preset second error threshold value, so as to judge that the precision of the DPF pressure difference sensor does not meet the requirement.
In one embodiment, the filtering process comprises a first order filtering process to modify the measured and calibrated values of the pressure differential across the DPF.
In one embodiment, the predetermined carbon loading is zero.
In one embodiment, the engine is determined to be in a park state when the following conditions are simultaneously satisfied: the whole vehicle accelerator is 0, the clutch is loosened, the hand brake is pulled up, and the vehicle speed is 0.
In a second aspect, an embodiment of the present application provides an accuracy detection system of a DPF differential pressure sensor, including: a controller and a memory, the memory having stored therein program code, which when executed by the controller, the controller performs the steps of the DPF differential pressure sensor accuracy detection method as described above.
In a third aspect, embodiments of the present application provide a storage medium storing program code, which when executed by a processor, implements the steps of the DPF differential pressure sensor accuracy detection method as described above.
The precision detection method of the DPF pressure difference sensor can control the engine to operate at variable speed for a period of time after deeply cleaning carbon deposition in the DPF and performing heat treatment so as to obtain the measured value of pressure difference between two ends of the DPF measured by the pressure difference sensor under different volume flow rates of DPF waste gas, compare the deviation between the measured value and the calibrated value of the DPF pressure difference sensor, and judge that the measurement precision of the DPF pressure difference sensor is insufficient if the deviation range exceeds a set range. The invention solves the problem that the precision of the DPF differential pressure sensor cannot be accurately detected, and can be applied to an electric control diesel engine adopting the DPF differential pressure sensor technology.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention, in which:
FIG. 1 is a flow chart of a method of accuracy detection of a DPF differential pressure sensor according to an exemplary embodiment of the present application;
FIG. 2 is a flow chart of a method for accuracy detection of a DPF differential pressure sensor according to an embodiment of the present application.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example one
Fig. 1 is a flowchart of a method of detecting accuracy of a DPF differential pressure sensor according to an exemplary embodiment of the present application. As shown in fig. 1, the present embodiment provides a method for detecting the accuracy of a DPF differential pressure sensor, including the following steps:
s100: and when the engine is in a parking state, controlling the DPF to perform parking regeneration in response to a parking regeneration instruction so as to perform cleaning treatment on the DPF.
The embodiment needs the engine to be in the original parking state to increase the rotating speed, so that the engine needs to be ensured to be in the safe parking state firstly. Usually, when the accelerator of the whole vehicle is 0, the clutch is released, the hand brake is pulled up and the vehicle speed is 0, the engine is judged to be in the parking state. Of course, the engine may also be idling at the same time.
For a DPF product, after carbon is accumulated in the DPF, the actual carbon accumulation amount of the DPF can affect the flow resistance of exhaust gas in the DPF, and the actual carbon accumulation amount of the DPF is difficult to measure. When the carbon loading in the DPF is 0 and the thermal treatment is performed for a period of time, the flow resistance of the exhaust gas in the DPF generally has good consistency. Based on the above consideration, before detecting the accuracy of the DPF differential pressure sensor, the DPF is subjected to deep cleaning treatment, specifically, parking regeneration which is forcibly triggered can be performed. For a new DPF, only a certain period of heat treatment is needed.
Wherein the cleaning process may include making the internal carbon loading of the DPF equal to or lower than a preset carbon loading and maintaining the DPF at a designated temperature for a preset time period. The preset carbon loading may be zero, or may be other measurable values, and this embodiment is described based on the preset carbon loading being zero.
Park regeneration is generally the industry-generic term for general function of DPF engines. In order to better ensure the deep cleaning effect, if the DPF is in an old state, the parking regeneration time period can be prolonged appropriately.
During the parking regeneration process, the particles captured by the DPF can be combusted into CO2The internal carbon loading of the DPF can be reduced to 0 by discharging. Meanwhile, the temperature of the DPF is increased, sometimes to 500 ℃, and the DPF can be kept at a specified temperature for a preset time period through continuous parking regeneration so as to complete the heat treatment process.
S200: after the cleaning treatment is carried out on the DPF, controlling the engine to operate at a variable speed between a first idle speed and a second idle speed which is larger than the first idle speed, and enabling the exhaust gas volume flow of the DPF to be smaller than or equal to a preset first volume flow threshold when the engine operates at the first idle speed, and enabling the exhaust gas volume flow of the DPF to be larger than or equal to a preset second volume flow threshold which is larger than the first volume flow threshold when the engine operates at the second idle speed; wherein measured values of pressure difference across the DPF measured by the pressure difference sensor at different DPF exhaust gas volume flow rates are obtained during said variable speed operation of the engine.
When the accuracy of the differential pressure sensor is detected, after the execution of deep-cleaning parking regeneration is finished, the engine is controlled to idle for a period of time so as to obtain the measured values of the pressure difference between two ends of the DPF measured by the differential pressure sensor under different volume flow rates of the DPF exhaust gas.
The idle running process of the engine can be a one-way speed change running process from low idle speed to high idle speed, and can also be a cycle from low idle speed to high idle speed and then back to low idle speed.
Controlling the engine to operate at a variable speed between a first idle speed and a second idle speed greater than the first idle speed may include: controlling the engine to smoothly shift from a first idle speed to a second idle speed during operation; or controlling the engine to alternate and smoothly change between the first idling speed and the second idling speed during the operation process.
For example, the engine may be controlled to operate at least one specific cycle by taking the smooth transition process of the engine speed from the first idle speed to the second idle speed and then back to the first idle speed as a specific cycle, so that the idle speed of the engine is cycled between the first idle speed and the second idle speed.
Of course, it is also possible to control the engine to smoothly shift from the lower first idle speed to the higher second idle speed only, or to smoothly shift from the higher second idle speed to the lower first idle speed.
When the rotating speed of the engine changes between the first idle speed and the second idle speed, the rotating speed can be gradually changed with a certain speed gradient, or gradually changed with a gradually increasing or gradually decreasing speed gradient, as long as a smooth transition can be realized when the rotating speed of the engine changes between the first idle speed and the second idle speed.
S300: calibration values for the pressure difference across the DPF at different DPF exhaust gas volume flows determined by calibration under the same operating conditions are obtained.
The process of obtaining a calibration of the pressure difference across the DPF at different DPF exhaust gas volume flows may be performed by: the DPF with the same model or the same batch is selected, and under the same working condition, calibration values of pressure difference at two ends of the DPF under different DPF exhaust gas volume flow rates can be obtained by calibrating a curve based on the corresponding relation between the DPF exhaust gas volume flow rate and the DPF pressure difference at two ends.
S400: and for any DPF exhaust gas volume flow, when the volume flow is smaller than the first volume flow threshold or larger than the second volume flow threshold, comparing the measured value and the calibrated value of the pressure difference between two ends of the DPF corresponding to the DPF exhaust gas volume flow, determining the difference between the measured value and the calibrated value, and judging that the precision of the DPF pressure difference sensor does not meet the requirement when the difference does not meet the preset precision condition. The method specifically comprises the following steps:
for any DPF exhaust gas volume flow, when it is less than the first volume flow threshold (e.g., 0.02 m)3/s), comparing the measured value of the pressure difference across the DPF, corresponding to the exhaust gas volume flow of the DPF, with a calibrated value (for example 1.6kPa), determining the difference between said measured value and calibrated value; and comparing the difference with a preset first error threshold, and when the difference is greater than the preset first error threshold (for example, +/-0.6 kPa), judging that the difference does not meet a preset precision condition, and further judging that the precision of the DPF pressure difference sensor does not meet the requirement.
When the volume flow of the DPF waste gas is larger than a preset first volume flow threshold value and smaller than a preset second volume flow threshold value, the calibrated value credibility of the pressure difference between two ends of the DPF under different volume flow of the DPF waste gas is obtained through a calibrated curve based on the corresponding relation between the volume flow of the waste gas of the DPF and the pressure difference between two ends of the DPF, and therefore, at the stage, the precision of the DPF differential pressure sensor can be judged through other methods.
When the volume flow of the DPF exhaust gas is larger than a preset second volume flow threshold (for example, 0.1 m)3In/s), the sum of the measured values of the pressure difference between both ends of the DPF corresponding to the volume flow rate of the exhaust gas of the DPFRespectively filtering the calibration values, comparing the measured values subjected to filtering with the calibration values, and determining the difference value between the measured values subjected to filtering and the calibration values; and comparing the difference with a preset second error threshold, and when the difference is greater than the preset second error threshold (for example, +/-0.8 kPa), judging that the difference does not meet a preset precision condition, and further judging that the precision of the DPF pressure difference sensor does not meet the requirement.
For the curve of the corresponding relationship between the exhaust gas volume flow rate of the DPF and the pressure difference across the DPF obtained by calibration, in order to make the curve of the corresponding relationship have good normalization, the calibration value of the pressure difference across the DPF obtained at different exhaust gas volume flow rates of the DPF may be subjected to filtering processing for a certain time (for example, 5s, 10s, etc.) to correct the calibration value of the pressure difference across the DPF and smooth the curve.
Likewise, the exact same filtering process is required for the measured values of the differential pressure across the DPF measured by the differential pressure sensor at different DPF exhaust gas volume flow rates acquired during said variable speed operation of the engine.
The filtering process may include a first-order filtering process, a second-order filtering process, and the like, and the measured value and the calibration value of the pressure difference across the DPF are corrected by the filtering process.
The precision of the differential pressure sensor is detected by comparing the measured value of the differential pressure sensor with the calibrated value, an effective method for detecting the precision of the differential pressure sensor is provided for market service personnel, whether the precision of the DPF differential pressure sensor meets the requirement can be accurately judged, and the DPF differential pressure sensor is timely replaced when the precision of the DPF differential pressure sensor does not meet the requirement so as to avoid fault reporting errors caused by frequent regeneration or non-regeneration of an engine.
Example two
FIG. 2 is a flow chart of a method for accuracy detection of a DPF differential pressure sensor according to an embodiment of the present application. As shown in fig. 2, when the accuracy of the DPF differential pressure sensor is detected, first, an engine parking state check is performed. The method can acquire an engine accelerator signal, a brake signal, a clutch signal, a vehicle speed signal and an engine idle speed signal, and judge that the engine is in a parking state when the engine accelerator is 0, the hand brake is pulled up, the clutch is released, the vehicle speed is 0 and the engine runs at idle speed.
When the engine is in a parking state, the DPF is deeply cleaned by executing parking regeneration of the engine. For the old DPF, the internal carbon loading of the DPF can be reduced to 0, and the heat treatment effect is achieved; for the new DPF, the internal carbon loading is naturally 0, and the effect of heat treatment is only needed.
After the deep cleaning process, the accuracy detection of the differential pressure sensor is performed. The engine may be controlled to operate for a particular cycle, and a smooth transition from low idle to high idle and back to low idle may generally be selected as the particular cycle. During the specific cycle of engine operation, the volume flow of the exhaust gas of the DPF is constantly changing, and the actual measurement value and the calibration value of the differential pressure sensor can be compared at the same time.
For any DPF exhaust gas volume flow, when it is less than 0.02m3At/s, the measured value of the pressure difference across the DPF measured by the differential pressure sensor at that time is compared with a calibrated value (e.g., 1.6kPa), and the difference between the measured value and the calibrated value is determined. And comparing the difference with a preset first error threshold (for example, +/-0.6 kPa), and when the difference is greater than the preset first error threshold, judging that the difference does not meet a preset precision condition, and further judging that the precision of the DPF pressure difference sensor does not meet the requirement.
When the volume flow of the DPF waste gas is larger than a preset first volume flow threshold value and smaller than a preset second volume flow threshold value, the calibrated value credibility of the pressure difference between two ends of the DPF under different volume flow of the DPF waste gas is obtained through a calibrated curve based on the corresponding relation between the volume flow of the waste gas of the DPF and the pressure difference between two ends of the DPF, and therefore, at the stage, the precision of the DPF differential pressure sensor can be judged through other methods.
When the volume flow of the DPF exhaust gas is more than 0.1m3And/s, respectively filtering the measured value and the calibrated value of the pressure difference between two ends of the DPF corresponding to the volume flow of the exhaust gas of the DPF, comparing the filtered measured value and the calibrated value, and determining the filtered measured value and the filtered calibrated valueA difference between the wave-processed measurement value and the calibration value; and comparing the difference with a preset second error threshold (for example, +/-0.8 kPa), and when the difference is greater than the preset second error threshold, judging that the difference does not meet a preset precision condition, and further judging that the precision of the DPF pressure difference sensor does not meet the requirement.
EXAMPLE III
The present embodiment provides a DPF differential pressure sensor accuracy detection system, including: a controller and a memory, the memory having stored therein program code, which when executed by the controller, the controller performs the steps of the DPF differential pressure sensor accuracy detection method as described above.
Example four
The present embodiment provides a storage medium storing program code, characterized in that the program code, when executed by a processor, implements the steps of the DPF differential pressure sensor accuracy detection method as described above.
Storage media, including permanent and non-permanent, removable and non-removable media, may implement any method or technology for storage of information. The information may be computer readable instructions, data structures, modules of a program, or other data.
Examples of storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device.
It is noted that the terms used herein are merely for describing particular embodiments and are not intended to limit exemplary embodiments according to the present application, and when the terms "include" and/or "comprise" are used in this specification, they specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.
It should be understood that the exemplary embodiments herein may be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art, and should not be construed as limiting the present invention.
Claims (10)
1. The precision detection method of the DPF pressure difference sensor is characterized by comprising the following steps:
when the engine is in a parking state, controlling the DPF to perform parking regeneration in response to a parking regeneration instruction so as to perform cleaning treatment on the DPF;
after the cleaning treatment is carried out on the DPF, controlling the engine to carry out variable-speed operation between a first idling speed and a second idling speed which is larger than the first idling speed, and enabling the volume flow rate of the exhaust gas of the DPF to be smaller than or equal to a preset first volume flow rate threshold value when the engine runs at the first idling speed and enabling the volume flow rate of the exhaust gas of the DPF to be larger than or equal to a preset second volume flow rate threshold value which is larger than the first volume flow rate threshold value when the engine runs at the second idling speed, wherein measurement values of pressure difference between two ends of the DPF, which is measured by a pressure difference sensor under different volume flow rates of the exhaust gas of the DPF, are obtained during the variable-speed operation of the engine;
acquiring calibration values of pressure difference between two ends of the DPF under different DPF exhaust gas volume flow rates determined by calibration under the same working condition;
and for any DPF exhaust gas volume flow, when the volume flow is smaller than the first volume flow threshold or larger than the second volume flow threshold, comparing the measured value and the calibrated value of the pressure difference between two ends of the DPF corresponding to the DPF exhaust gas volume flow, determining the difference between the measured value and the calibrated value, and judging that the precision of the DPF pressure difference sensor does not meet the requirement when the difference does not meet the preset precision condition.
2. The DPF differential pressure sensor accuracy detection method of claim 1, wherein the cleaning process includes making an internal carbon loading of the DPF equal to or lower than a preset carbon loading and maintaining the DPF at a designated temperature for a preset time period.
3. The DPF differential pressure sensor accuracy detection method of claim 1, wherein controlling the engine to operate at a variable speed between a first idle speed and a second idle speed greater than the first idle speed comprises:
controlling the engine to smoothly shift from a first idle speed to a second idle speed during operation; or
And controlling the engine to alternate and smoothly change between the first idling speed and the second idling speed during the operation process.
4. The DPF differential pressure sensor accuracy detection method according to claim 1, wherein for any DPF exhaust gas volume flow, when it is smaller than the first volume flow threshold or larger than the second volume flow threshold, comparing a measured value and a calibrated value of a DPF differential pressure across the DPF corresponding to the DPF exhaust gas volume flow, determining a difference between the measured value and the calibrated value, and determining that the DPF differential pressure sensor accuracy does not meet a requirement when the difference does not meet a preset accuracy condition, comprises:
for any DPF exhaust gas volume flow, when the volume flow is smaller than the first volume flow threshold value, comparing a measured value and a calibrated value of pressure difference between two ends of the DPF corresponding to the DPF exhaust gas volume flow, and determining a difference value between the measured value and the calibrated value;
and comparing the difference value with a preset first error threshold value, and when the difference value is greater than the preset first error threshold value, judging that the difference value does not meet a preset precision condition, and further judging that the precision of the DPF pressure difference sensor does not meet the requirement.
5. The DPF differential pressure sensor accuracy detection method according to claim 1, wherein for any DPF exhaust gas volume flow, when it is smaller than the first volume flow threshold or larger than the second volume flow threshold, comparing a measured value and a calibrated value of a DPF differential pressure across the DPF corresponding to the DPF exhaust gas volume flow, determining a difference between the measured value and the calibrated value, and determining that the DPF differential pressure sensor accuracy does not meet a requirement when the difference does not meet a preset accuracy condition, comprises:
when the volume flow of the DPF waste gas is larger than a preset second volume flow threshold value, respectively carrying out filtering processing on a measured value and a calibrated value of pressure difference between two ends of the DPF corresponding to the volume flow of the DPF waste gas, comparing the measured value and the calibrated value which are subjected to the filtering processing, and determining a difference value between the measured value and the calibrated value which are subjected to the filtering processing;
and comparing the difference value with a preset second error threshold value, and judging that the difference value does not meet a preset precision condition when the difference value is greater than the preset second error threshold value, so as to judge that the precision of the DPF pressure difference sensor does not meet the requirement.
6. The DPF differential pressure sensor accuracy detection method according to claim 5, wherein the filtering process includes a first order filtering process to correct the measured value and the calibration value of the DPF differential pressure across.
7. The DPF differential pressure sensor accuracy detection method of claim 2, wherein the preset carbon loading is zero.
8. The DPF differential pressure sensor accuracy detection method according to claim 1, wherein the engine is judged to be in a parked state when the following conditions are simultaneously satisfied: the whole vehicle accelerator is 0, the clutch is loosened, the hand brake is pulled up, and the vehicle speed is 0.
9. An accuracy detection system of a DPF pressure difference sensor, comprising: a controller and a memory, the memory having stored therein program code, which when executed by the controller, the controller executes the steps of the DPF differential pressure sensor accuracy detecting method according to any one of claims 1 to 7.
10. A storage medium storing program code, characterized in that the program code, when executed by a processor, implements the steps of the DPF differential pressure sensor accuracy detecting method according to any one of claims 1 to 7.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115013173A (en) * | 2022-06-28 | 2022-09-06 | 潍柴动力股份有限公司 | Exhaust gas flow rate determination method and ECU |
| CN115013131A (en) * | 2022-07-26 | 2022-09-06 | 潍柴动力股份有限公司 | DPF state monitoring method and device and vehicle |
| CN116105925A (en) * | 2023-03-22 | 2023-05-12 | 潍柴动力股份有限公司 | Correction method and device for DPF differential pressure sensor measured value and vehicle |
| CN116104622A (en) * | 2023-04-13 | 2023-05-12 | 潍柴动力股份有限公司 | DPF overload judging method, device, storage medium and equipment |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002206419A (en) * | 2001-01-10 | 2002-07-26 | Isuzu Motors Ltd | Control method of diesel particulate filter device |
| US20040200271A1 (en) * | 2003-04-11 | 2004-10-14 | Van Nieuwstadt Michiel J. | Pressure sensor diagnosis via a computer |
| JP2005076578A (en) * | 2003-09-02 | 2005-03-24 | Toyota Motor Corp | Method for determination of normal operation of internal combustion engine, and method for detecting degree of clogging in exhaust filter |
| EP1591635A1 (en) * | 2004-04-22 | 2005-11-02 | Nissan Motor Co., Ltd. | Regeneration control of diesel particulate filter |
| JP2008157199A (en) * | 2006-12-26 | 2008-07-10 | Mitsubishi Fuso Truck & Bus Corp | Abnormality detection device of sensor |
| EP2423480A2 (en) * | 2010-08-27 | 2012-02-29 | Volkswagen AG | Method for verifying an initial value determined using at least one measurement, method for treating a diesel particulate filter and device for verifying a differential pressure value |
| DE102011003748A1 (en) * | 2011-02-08 | 2012-08-09 | Robert Bosch Gmbh | Method for monitoring functioning of differential pressure sensor in exhaust gas after-treatment system of diesel engine, involves closing defective front terminal or rear terminal with change in stationary measured pressure difference |
| US20130084217A1 (en) * | 2010-06-11 | 2013-04-04 | Isuzu Motors Limited | Diesel particulate filter system |
| US20140331752A1 (en) * | 2013-05-08 | 2014-11-13 | Cummins Ip, Inc. | Exhaust aftertreatment system diagnostic and conditioning |
| US20160341142A1 (en) * | 2015-05-19 | 2016-11-24 | GM Global Technology Operations LLC | Control system for diagnosing a malfunctioning of a pressure sensor included in an aftertreatment system of an internal combustion engine |
| CN106368777A (en) * | 2016-11-21 | 2017-02-01 | 上海汽车集团股份有限公司 | Regeneration control method for automobile particle trap device |
| DE102018116706A1 (en) * | 2017-07-12 | 2019-01-17 | Ford Global Technologies, Llc | METHOD AND SYSTEM FOR DIAGNOSING A PARTICLE FILTER SENSOR |
| WO2019141917A1 (en) * | 2018-01-19 | 2019-07-25 | Psa Automobiles Sa | Method for conformity control on installation of a pressure sensor of a combustion engine particle filter |
| DE102019106019A1 (en) * | 2018-03-12 | 2019-09-12 | Ford Global Technologies, Llc | SYSTEMS AND METHOD FOR REDUCING WEARNING OF THE PRESSURE SENSOR OF AN OTTOPARTICLE FILTER |
| CN114718706A (en) * | 2021-01-05 | 2022-07-08 | 北京福田康明斯发动机有限公司 | Sensor detection method, sensor detection device and readable storage medium |
-
2020
- 2020-09-11 CN CN202010953227.3A patent/CN114165346B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002206419A (en) * | 2001-01-10 | 2002-07-26 | Isuzu Motors Ltd | Control method of diesel particulate filter device |
| US20040200271A1 (en) * | 2003-04-11 | 2004-10-14 | Van Nieuwstadt Michiel J. | Pressure sensor diagnosis via a computer |
| JP2005076578A (en) * | 2003-09-02 | 2005-03-24 | Toyota Motor Corp | Method for determination of normal operation of internal combustion engine, and method for detecting degree of clogging in exhaust filter |
| EP1591635A1 (en) * | 2004-04-22 | 2005-11-02 | Nissan Motor Co., Ltd. | Regeneration control of diesel particulate filter |
| JP2008157199A (en) * | 2006-12-26 | 2008-07-10 | Mitsubishi Fuso Truck & Bus Corp | Abnormality detection device of sensor |
| US20130084217A1 (en) * | 2010-06-11 | 2013-04-04 | Isuzu Motors Limited | Diesel particulate filter system |
| EP2423480A2 (en) * | 2010-08-27 | 2012-02-29 | Volkswagen AG | Method for verifying an initial value determined using at least one measurement, method for treating a diesel particulate filter and device for verifying a differential pressure value |
| DE102011003748A1 (en) * | 2011-02-08 | 2012-08-09 | Robert Bosch Gmbh | Method for monitoring functioning of differential pressure sensor in exhaust gas after-treatment system of diesel engine, involves closing defective front terminal or rear terminal with change in stationary measured pressure difference |
| US20140331752A1 (en) * | 2013-05-08 | 2014-11-13 | Cummins Ip, Inc. | Exhaust aftertreatment system diagnostic and conditioning |
| US20160341142A1 (en) * | 2015-05-19 | 2016-11-24 | GM Global Technology Operations LLC | Control system for diagnosing a malfunctioning of a pressure sensor included in an aftertreatment system of an internal combustion engine |
| CN106368777A (en) * | 2016-11-21 | 2017-02-01 | 上海汽车集团股份有限公司 | Regeneration control method for automobile particle trap device |
| DE102018116706A1 (en) * | 2017-07-12 | 2019-01-17 | Ford Global Technologies, Llc | METHOD AND SYSTEM FOR DIAGNOSING A PARTICLE FILTER SENSOR |
| WO2019141917A1 (en) * | 2018-01-19 | 2019-07-25 | Psa Automobiles Sa | Method for conformity control on installation of a pressure sensor of a combustion engine particle filter |
| DE102019106019A1 (en) * | 2018-03-12 | 2019-09-12 | Ford Global Technologies, Llc | SYSTEMS AND METHOD FOR REDUCING WEARNING OF THE PRESSURE SENSOR OF AN OTTOPARTICLE FILTER |
| CN114718706A (en) * | 2021-01-05 | 2022-07-08 | 北京福田康明斯发动机有限公司 | Sensor detection method, sensor detection device and readable storage medium |
Non-Patent Citations (4)
| Title |
|---|
| 张军;杨新达;王国栋;: "基于DPF压差传感器的灰分控制研究", 农业装备与车辆工程, no. 1, pages 89 - 92 * |
| 李新元, 宋宝玉, 齐毓霖, 刘树春: "高压压差传感器的研究", 仪表技术与传感器, no. 06, pages 26 - 29 * |
| 李祥;熊锐;吴坚;吕永;苏庆鹏;刘巨江;: "国六排放标准下的缸内直喷汽油机颗粒捕集器精度碳载模型建立及验证", 机械科学与技术, no. 06, pages 63 - 69 * |
| 杨继蕊;: "整车上的GPF标定", 机电信息, no. 15, pages 116 - 118 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115013173A (en) * | 2022-06-28 | 2022-09-06 | 潍柴动力股份有限公司 | Exhaust gas flow rate determination method and ECU |
| CN115013173B (en) * | 2022-06-28 | 2023-07-18 | 潍柴动力股份有限公司 | Exhaust gas flow determination method, device, storage medium and ECU |
| CN115013131A (en) * | 2022-07-26 | 2022-09-06 | 潍柴动力股份有限公司 | DPF state monitoring method and device and vehicle |
| CN115013131B (en) * | 2022-07-26 | 2023-11-17 | 潍柴动力股份有限公司 | DPF state monitoring method and device and vehicle |
| CN116105925A (en) * | 2023-03-22 | 2023-05-12 | 潍柴动力股份有限公司 | Correction method and device for DPF differential pressure sensor measured value and vehicle |
| CN116104622A (en) * | 2023-04-13 | 2023-05-12 | 潍柴动力股份有限公司 | DPF overload judging method, device, storage medium and equipment |
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