CN114165346B - Precision detection method, system and storage medium of DPF differential pressure sensor - Google Patents
Precision detection method, system and storage medium of DPF differential pressure sensor Download PDFInfo
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- CN114165346B CN114165346B CN202010953227.3A CN202010953227A CN114165346B CN 114165346 B CN114165346 B CN 114165346B CN 202010953227 A CN202010953227 A CN 202010953227A CN 114165346 B CN114165346 B CN 114165346B
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- 238000001514 detection method Methods 0.000 title claims abstract description 17
- 238000003860 storage Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 39
- 230000008569 process Effects 0.000 claims abstract description 18
- 238000004140 cleaning Methods 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 23
- 229910052799 carbon Inorganic materials 0.000 claims description 23
- 238000001914 filtration Methods 0.000 claims description 20
- 230000008929 regeneration Effects 0.000 claims description 17
- 238000011069 regeneration method Methods 0.000 claims description 17
- 239000007789 gas Substances 0.000 description 45
- 238000010438 heat treatment Methods 0.000 description 6
- 230000007704 transition Effects 0.000 description 6
- 238000005259 measurement Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000000670 limiting effect Effects 0.000 description 3
- 230000001186 cumulative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000002912 waste gas Substances 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
- 238000011065 in-situ storage Methods 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
- 230000004044 response Effects 0.000 description 1
Classifications
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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
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
The application provides a precision detection method, a system and a storage medium of a DPF differential pressure sensor, 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 differences at two ends of the DPF, which are measured by a differential pressure sensor under different DPF exhaust gas volume flows, in the variable speed operation process of the engine; acquiring a calibration value of the pressure difference at two ends of the DPF under different exhaust gas volume flows of the DPF, which is determined by calibration under the same working condition; for any one DPF exhaust gas volume flow, when the exhaust gas volume flow is smaller than the first volume flow threshold or larger than the second volume flow threshold, whether the accuracy of the DPF differential pressure sensor meets the requirement is judged by comparing the measured value and the calibration value of the pressure difference between the two ends of the DPF. The embodiment can accurately judge whether the accuracy of the DPF differential pressure sensor meets the requirement.
Description
Technical Field
The application relates to the technical field of engines, in particular to a precision detection method, a system and a storage medium of a DPF differential pressure sensor.
Background
Currently, an electronically controlled diesel engine employing DPF technology typically employs a measured differential pressure of a DPF differential pressure sensor to evaluate the carbon loading of the DPF. The specific principle is as follows: when the DPF is under different carbon loading, the pressure difference at the two ends of the DPF and the volume flow of the waste gas have a better corresponding relation, and then the carbon loading in the DPF can be estimated well 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 judged internal carbon loading of the DPF will have obvious error, thereby causing frequent regeneration or non-regeneration of the engine, fault error reporting of excessive carbon loading, speed limiting and torque limiting, and generating a plurality of adverse effects.
Currently, service personnel in the market can only detect whether the static measured value of the differential pressure sensor is 0 or not or whether the dynamic measured value changes along with the change of the air flow when checking whether the differential pressure sensor is normal or not on the whole vehicle, and observe whether a fault code is reported or not. These means 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 application mainly aims to provide a precision detection method, a system and a storage medium of a DPF 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 steps of: when the engine is in a parking state, responding to a parking regeneration instruction, controlling the DPF to carry out parking regeneration so as to carry out cleaning treatment on the DPF; after the DPF is subjected to cleaning treatment, 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 enabling the exhaust gas volume flow of the DPF to be smaller than or equal to a preset first volume flow threshold value when the engine is operated 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 value which is larger than the first volume flow threshold value when the engine is operated at the second idle speed, wherein the measured value of the pressure difference at two ends of the DPF, which is measured by a differential pressure sensor, is obtained during the variable speed operation of the engine; acquiring a calibration value of the pressure difference at two ends of the DPF under different exhaust gas volume flows of the DPF, which is determined by calibration under the same working condition; and for any one 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 calibration value of the pressure difference at two ends of the DPF corresponding to the DPF exhaust gas volume flow, determining a difference value between the measured value and the calibration value, and judging that the accuracy of the DPF differential pressure sensor does not meet the requirement when the difference value does not meet the preset accuracy condition.
In one embodiment, the cleaning process includes maintaining the internal carbon loading of the DPF at or below a predetermined carbon loading and maintaining the DPF at a specified temperature for a predetermined period of time.
In one embodiment, controlling an engine to operate at a variable speed between a first idle speed and a second idle speed greater than the first idle speed includes: controlling the engine to smoothly shift from the first idle speed to the second idle speed during operation; or controlling the engine to alternate between the first idle speed and the second idle speed in a smooth transition during operation.
In one embodiment, for any one of the DPF exhaust gas volume flows, when it is smaller than the first volume flow threshold or larger than the second volume flow threshold, comparing a measured value and a calibration value of a pressure difference between both ends of the DPF corresponding to the DPF exhaust gas volume flow, determining a difference between the measured value and the calibration value, and determining that the accuracy of the DPF differential pressure sensor does not meet the requirement when the difference does not meet the preset accuracy condition, includes: for any one DPF exhaust gas volume flow, when the DPF exhaust gas volume flow is smaller than the first volume flow threshold value, comparing a measured value and a calibration value of the pressure difference at two ends of the DPF corresponding to the DPF exhaust gas volume flow, and determining a difference value between the measured value and the calibration value; and comparing the difference value with a preset first error threshold value, and when the difference value is larger 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 differential pressure sensor does not meet the requirement.
In one embodiment, for any one of the DPF exhaust gas volume flows, when it is smaller than the first volume flow threshold or larger than the second volume flow threshold, comparing a measured value and a calibration value of a pressure difference between both ends of the DPF corresponding to the DPF exhaust gas volume flow, determining a difference between the measured value and the calibration value, and determining that the accuracy of the DPF differential pressure sensor does not meet the requirement when the difference does not meet the preset accuracy condition, includes: when the DPF exhaust gas volume flow is larger than a preset second volume flow threshold, respectively carrying out filtering treatment on a measured value and a calibration value of the pressure difference at two ends of the DPF corresponding to the DPF exhaust gas volume flow, comparing the measured value and the calibration value which are subjected to the filtering treatment, and determining a difference value between the measured value and the calibration value which are subjected to the filtering treatment; and comparing the difference value with a preset second error threshold value, and when the difference value is larger than the preset second error threshold value, judging that the difference value does not meet a preset precision condition, and further judging that the precision of the DPF differential pressure sensor does not meet the requirement.
In one embodiment, the filtering process includes a first order filtering process to correct for measured and calibrated values of the differential pressure across the DPF.
In one embodiment, the preset 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 accelerator of the whole vehicle is 0, the clutch is released, the hand brake is pulled up, and the speed of the whole vehicle is 0.
In a second aspect, an embodiment of the present application provides a precision detection system of a DPF differential pressure sensor, including: a controller and a memory, wherein the memory stores program code, which when executed by the controller, performs the steps of the method for detecting accuracy of the DPF differential pressure sensor as described above.
In a third aspect, an embodiment of the present application provides a storage medium storing program code which, when executed by a processor, implements the steps of the method for detecting accuracy of a DPF differential pressure sensor as described above.
The precision detection method of the DPF differential pressure sensor can control the engine to operate at variable speed for a period of time after deep cleaning of carbon deposition in the DPF and heat treatment, so as to obtain the measured value of the pressure difference at the two ends of the DPF measured by the differential pressure sensor under different DPF exhaust gas volume flows, compare the deviation between the measured value of the DPF differential pressure sensor and a calibration value, and judge that the measurement precision of the DPF differential pressure sensor is insufficient if the deviation range exceeds a set range. The application solves the problem that the accuracy of the DPF differential pressure sensor can not 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 included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a undue limitation on the application, wherein:
FIG. 1 is a flowchart of a method of accuracy detection of a DPF differential pressure sensor in accordance with an exemplary embodiment of the present application;
fig. 2 is a flowchart of a method for detecting accuracy of a DPF differential pressure sensor according to an embodiment of the present application.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
Example 1
Fig. 1 is a flowchart of a precision detection method of a DPF differential pressure sensor according to an exemplary embodiment of the present application. As shown in fig. 1, the embodiment provides a method for detecting accuracy of a DPF differential pressure sensor, including the following steps:
s100: when the engine is in a parking state, the DPF is controlled to carry out parking regeneration in response to a parking regeneration instruction so as to carry out cleaning treatment on the DPF.
The present embodiment requires the engine to increase the rotational speed in the in-situ parking state, and thus first requires ensuring that the engine is in a safe parking state. And normally, 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 and is met, the engine is judged to be in a parking state. Of course, the engine may be simultaneously idling.
For a DPF product, the actual cumulative carbon amount of the DPF affects the flow resistance of exhaust gas in the DPF after the DPF accumulates carbon, and the actual cumulative carbon amount of the DPF is difficult to measure. And when the carbon loading in the DPF is 0, and after a period of heat treatment, the flow resistance of the exhaust gas in the DPF is generally uniform. Based on the above considerations, the DPF is subjected to deep cleaning treatment before the accuracy of the DPF differential pressure sensor is detected, and specifically, the deep cleaning treatment can be completed by forced triggering of parking regeneration. For a new DPF, only a certain period of heat treatment is required.
Wherein the cleaning process may include maintaining the internal carbon loading of the DPF at or below a predetermined carbon loading and maintaining the DPF at a predetermined temperature for a predetermined period of time. The preset carbon loading may be zero, or may be any other measurable value, and this embodiment is described based on the preset carbon loading being zero.
Parking regeneration is generally a generic term of industry and is a generic function of DPF engines. In order to better ensure the deep cleaning effect, if the DPF has a old state, the duration of the parking regeneration can be prolonged appropriately.
During the parking regeneration process, the particles trapped by the DPF can be burned into CO 2 Is discharged, so that the internal carbon loading of the DPF can be reduced to 0. Meanwhile, the temperature of the DPF can be increased to 500 ℃ at times, and the DPF can be kept at a designated temperature for a preset period of time through continuous parking regeneration, so that the heat treatment process is completed.
S200: after the DPF is cleaned, controlling the engine to operate at a speed varying between a first idle speed and a second idle speed which is greater than the first idle speed, and enabling the exhaust gas volume flow of the DPF to be less than or equal to a preset first volume flow threshold value when the engine is operated at the first idle speed, and enabling the exhaust gas volume flow of the DPF to be greater than or equal to a preset second volume flow threshold value which is greater than the first volume flow threshold value when the engine is operated at the second idle speed; wherein measurements of the differential pressure across the DPF measured by the differential pressure sensor at different DPF exhaust gas volumetric flows are obtained during said variable speed operation of the engine.
When the accuracy of the differential pressure sensor is detected, after the deep clean parking regeneration is finished, the engine is controlled to run at idle speed for a period of time, so that the measured value of the pressure difference at two ends of the DPF, which is measured by the differential pressure sensor under different DPF exhaust gas volume flows, is obtained.
The idle running process of the engine can be a unidirectional 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 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 the first idle speed to the second idle speed during operation; or controlling the engine to alternate between the first idle speed and the second idle speed in a smooth transition during operation.
For example, a smooth transition of the engine speed from the lower first idle speed to the higher second idle speed back to the lower first idle speed may be used as a specific cycle, and the engine may be controlled to run at least one such specific cycle such that the idle speed of the engine cycles between the first idle speed and the second idle speed.
Of course, it is also possible to control only the smooth transition of the engine from the lower first idle speed to the higher second idle speed, or from the higher second idle speed to the lower first idle speed.
When the rotation speed of the engine is changed between the first idle speed and the second idle speed, the rotation speed of the engine can be changed gradually with a certain speed gradient, and the rotation speed of the engine can be changed gradually with a gradually increasing or gradually decreasing speed gradient, so long as the smooth transition can be realized when the rotation speed of the engine is changed between the first idle speed and the second idle speed.
S300: a calibration value of the pressure difference across the DPF at different DPF exhaust gas volumetric flows, determined by calibration under the same operating conditions, is obtained.
The process of obtaining a calibrated value of the pressure difference across the DPF at different DPF exhaust gas volumetric flows may be performed as follows: and selecting DPFs of the same model or the same batch, and under the same working condition, calibrating a curve based on the corresponding relation between the exhaust gas volume flow of the DPFs and the pressure difference at the two ends of the DPFs to obtain calibration values of the pressure difference at the two ends of the DPFs under different exhaust gas volume flows of the DPFs.
S400: and for any one 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 calibration value of the pressure difference at two ends of the DPF corresponding to the DPF exhaust gas volume flow, determining a difference value between the measured value and the calibration value, and judging that the accuracy of the DPF differential pressure sensor does not meet the requirement when the difference value does not meet the preset accuracy condition. The method specifically comprises the following steps:
for any one of the DPF exhaust gas volumetric flows, when it is less than the first volumetric flow threshold (e.g., 0.02m 3 S) comparing the measured value of the pressure difference across the DPF corresponding to the exhaust gas volumetric flow of the DPF with a calibrated value (e.g. 1.6 kPa), determining the difference between said measured value and calibrated value; and comparing the difference value with a preset first error threshold value, and when the difference value is larger than the preset first error threshold value (for example + -0.6 kPa), judging that the difference value does not meet the preset precision condition, and further judging that the precision of the DPF differential pressure sensor does not meet the requirement.
When the DPF exhaust gas volume flow is larger than the preset first volume flow threshold and smaller than the preset second volume flow threshold, the reliability of the calibration value of the pressure difference at the two ends of the DPF under different DPF exhaust gas volume flows is lower through the calibrated curve based on the corresponding relation between the DPF exhaust gas volume flow and the pressure difference at the two ends of the DPF, so that the accuracy of the DPF differential pressure sensor can be judged by other methods at the stage.
When the DPF exhaust gas volumetric flow is greater than a preset second volumetric flow threshold (e.g., 0.1m 3 And/s), filtering the measured value and the calibration value of the pressure difference between two ends of the DPF corresponding to the volume flow of the DPF exhaust gas, and comparing the filtered valuesThe processed measured value and the calibration value are used for determining the difference value between the measured value and the calibration value which are subjected to filtering processing; and comparing the difference value with a preset second error threshold value, and when the difference value is larger than the preset second error threshold value (for example + -0.8 kPa), judging that the difference value does not meet the preset precision condition, and further judging that the precision of the DPF differential pressure sensor does not meet the requirement.
For the curve of the corresponding relation between the exhaust gas volume flow of the DPF and the pressure difference at two ends of the DPF, which is obtained through calibration, in order to ensure that the curve of the corresponding relation has better normalization, filtering treatment can be carried out on the calibration values of the pressure difference at two ends of the DPF under different DPF exhaust gas volume flows for a certain time (such as 5s, 10s and the like) so as to correct the calibration values of the pressure difference at two ends of the DPF, and the curve is smoothed.
Likewise, the exact same filtering process is required for the measured values of the pressure difference across the DPF, which are obtained during said variable speed operation of the engine and are measured by the differential pressure sensor at different exhaust gas volumetric flows of the DPF.
The filtering process may include a first-order filtering process, a second-order filtering process, and the like, by which the measured value and the calibrated value of the pressure difference across the DPF are corrected.
According to the embodiment, the accuracy of the differential pressure sensor is detected by comparing the measured value of the differential pressure sensor with the calibration value, an effective method for detecting the accuracy of the differential pressure sensor is provided for market service personnel, whether the accuracy of the DPF differential pressure sensor meets the requirement can be accurately judged, and when the accuracy of the DPF differential pressure sensor does not meet the requirement, the DPF differential pressure sensor is replaced in time, so that the fault error reporting caused by frequent regeneration or non-regeneration of an engine is avoided.
Example two
Fig. 2 is a flowchart of a method for detecting accuracy of a DPF differential pressure sensor according to an embodiment of the present application. As shown in fig. 2, when accuracy detection of the DPF differential pressure sensor is performed, first, an engine parking state check is performed. The engine accelerator, brake and clutch signals, a vehicle speed signal and an engine idle speed signal can be obtained, and when the engine accelerator is 0, the hand brake is pulled up, the clutch is released, the vehicle speed is 0 and the engine is in idle speed operation, the engine is judged to be in a parking state.
When the engine is in a parked state, the DPF is deeply cleaned by executing the 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 function is also realized; for the new DPF, the internal carbon loading is naturally 0, and only the heat treatment function is needed.
After the deep cleaning process, the accuracy detection of the differential pressure sensor is performed. The engine may be controlled to run for a particular cycle, and typically a smooth transition from low idle to high idle back to low idle may be selected as the particular cycle. The exhaust gas volumetric flow of the DPF is continuously changed during the operation of the engine in this particular cycle, and the actual measured value and the calibrated value of the differential pressure sensor can be simultaneously compared.
For any one DPF exhaust gas volume flow, when it is less than 0.02m 3 At/s, comparing the measured value of the pressure difference between the two ends of the DPF measured by the differential pressure sensor at the moment with a calibration value (for example, 1.6 kPa), and determining the difference between the measured value and the calibration value. And comparing the difference value with a preset first error threshold value (for example + -0.6 kPa), and when the difference value is larger than the preset first error threshold value, judging that the difference value does not meet the preset precision condition, and further judging that the precision of the DPF differential pressure sensor does not meet the requirement.
When the DPF exhaust gas volume flow is larger than the preset first volume flow threshold and smaller than the preset second volume flow threshold, the reliability of the calibration value of the pressure difference at the two ends of the DPF under different DPF exhaust gas volume flows is lower through the calibrated curve based on the corresponding relation between the DPF exhaust gas volume flow and the pressure difference at the two ends of the DPF, so that the accuracy of the DPF differential pressure sensor can be judged by other methods at the stage.
When the volume flow of the exhaust gas of the DPF is more than 0.1m 3 And/s, respectively carrying out filtering treatment on the measured value and the calibration value of the pressure difference at two ends of the DPF corresponding to the volume flow of the DPF waste gas, comparing the measured value and the calibration value which are subjected to the filtering treatment, and determining the difference value between the measured value and the calibration value which are subjected to the filtering treatment; will beAnd comparing the difference value with a preset second error threshold value (for example + -0.8 kPa), and when the difference value is larger than the preset second error threshold value, judging that the difference value does not meet the preset precision condition, and further judging that the precision of the DPF differential pressure sensor does not meet the requirement.
Example III
The embodiment provides a precision detection system of a DPF differential pressure sensor, comprising: a controller and a memory, wherein the memory stores program code, which when executed by the controller, performs the steps of the method for detecting accuracy of the DPF differential pressure sensor as described above.
Example IV
The present embodiment provides a storage medium storing program code, wherein the program code, when executed by a processor, implements the steps of the accuracy detection method of the DPF differential pressure sensor as described above.
Where storage media includes both permanent and non-permanent, removable and non-removable media, information storage may be implemented in any method or technology. 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 used merely to describe particular embodiments and are not intended to limit exemplary embodiments in accordance with the present application, when the terms "comprising" and/or "including" are used in this specification, they specify the presence of stated 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 the claims and drawings of the present application are used for distinguishing between similar objects and not 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 in this specification 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 application.
Claims (10)
1. The precision detection method of the DPF differential pressure sensor is characterized by comprising the following steps of:
when the engine is in a parking state, responding to a parking regeneration instruction, controlling the DPF to carry out parking regeneration so as to carry out cleaning treatment on the DPF;
after the DPF is subjected to cleaning treatment, 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 enabling the exhaust gas volume flow of the DPF to be smaller than or equal to a preset first volume flow threshold value when the engine is operated 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 value which is larger than the first volume flow threshold value when the engine is operated at the second idle speed, wherein the measured value of the pressure difference at two ends of the DPF, which is measured by a differential pressure sensor, is obtained during the variable speed operation of the engine;
acquiring a calibration value of the pressure difference at two ends of the DPF under different exhaust gas volume flows of the DPF, which is determined by calibration under the same working condition;
and for any one 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 calibration value of the pressure difference at two ends of the DPF corresponding to the DPF exhaust gas volume flow, determining a difference value between the measured value and the calibration value, and judging that the accuracy of the DPF differential pressure sensor does not meet the requirement when the difference value does not meet the preset accuracy condition.
2. The method of detecting accuracy of a DPF differential pressure sensor according to 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 specified temperature for a preset period of time.
3. The method of detecting accuracy of a DPF differential pressure sensor according to 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 the first idle speed to the second idle speed during operation; or (b)
The engine is controlled to alternate between a first idle speed and a second idle speed during operation.
4. The method according to claim 1, wherein for any one of the DPF exhaust gas volume flows, when it is smaller than the first volume flow threshold or larger than the second volume flow threshold, comparing a measured value of a DPF both-end pressure difference corresponding to the DPF exhaust gas volume flow with a calibration value, determining a difference between the measured value and the calibration value, and determining that the accuracy of the DPF differential pressure sensor does not satisfy a requirement when the difference does not satisfy a preset accuracy condition, comprising:
for any one DPF exhaust gas volume flow, when the DPF exhaust gas volume flow is smaller than the first volume flow threshold value, comparing a measured value and a calibration value of the pressure difference at two ends of the DPF corresponding to the DPF exhaust gas volume flow, and determining a difference value between the measured value and the calibration value;
and comparing the difference value with a preset first error threshold value, and when the difference value is larger 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 differential pressure sensor does not meet the requirement.
5. The method according to claim 1, wherein for any one of the DPF exhaust gas volume flows, when it is smaller than the first volume flow threshold or larger than the second volume flow threshold, comparing a measured value of a DPF both-end pressure difference corresponding to the DPF exhaust gas volume flow with a calibration value, determining a difference between the measured value and the calibration value, and determining that the accuracy of the DPF differential pressure sensor does not satisfy a requirement when the difference does not satisfy a preset accuracy condition, comprising:
when the DPF exhaust gas volume flow is larger than a preset second volume flow threshold, respectively carrying out filtering treatment on a measured value and a calibration value of the pressure difference at two ends of the DPF corresponding to the DPF exhaust gas volume flow, comparing the measured value and the calibration value which are subjected to the filtering treatment, and determining a difference value between the measured value and the calibration value which are subjected to the filtering treatment;
and comparing the difference value with a preset second error threshold value, and when the difference value is larger than the preset second error threshold value, judging that the difference value does not meet a preset precision condition, and further judging that the precision of the DPF differential pressure sensor does not meet the requirement.
6. The method for detecting the accuracy of the differential pressure sensor of the DPF according to claim 5, wherein the filtering process includes a first order filtering process to correct the measured value and the calibrated value of the differential pressure across the DPF.
7. The method for detecting accuracy of a DPF differential pressure sensor according to claim 2, wherein the preset carbon loading is zero.
8. The accuracy detecting method of a DPF differential pressure sensor according to claim 1, wherein the engine is judged to be in a parked state when the following conditions are simultaneously satisfied: the accelerator of the whole vehicle is 0, the clutch is released, the hand brake is pulled up, and the speed of the whole vehicle is 0.
9. A precision detection system of a DPF differential pressure sensor, characterized by comprising: a controller and a memory, in which a program code is stored, which when executed by the controller, performs the steps of the accuracy detection method of the DPF differential pressure sensor according to any one of claims 1 to 7.
10. A storage medium storing program code which, when executed by a processor, implements the steps of the accuracy detection method of the DPF differential pressure sensor according to any one of claims 1 to 7.
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| 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 |
| 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 |
| CN116104622B (en) * | 2023-04-13 | 2023-07-18 | 潍柴动力股份有限公司 | DPF overload judging method, device, storage medium and equipment |
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