CN112412600A - Method, device and equipment for monitoring trapping efficiency of particle trap and storage medium - Google Patents

Method, device and equipment for monitoring trapping efficiency of particle trap and storage medium Download PDF

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Publication number
CN112412600A
CN112412600A CN202011342916.7A CN202011342916A CN112412600A CN 112412600 A CN112412600 A CN 112412600A CN 202011342916 A CN202011342916 A CN 202011342916A CN 112412600 A CN112412600 A CN 112412600A
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monitoring
particle trap
carbon accumulation
trapping efficiency
carbon
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CN112412600B (en
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詹坤
李庆
王云鹏
赵小虎
刘海报
李超
邱文龙
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Anhui Jianghuai Automobile Group Corp
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Anhui Jianghuai Automobile Group Corp
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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
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/04—Filtering activity of particulate filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1606—Particle filter loading or soot amount
    • 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

Abstract

The invention belongs to the technical field of particle filtration of diesel vehicles, and discloses a method, a device, equipment and a storage medium for monitoring the trapping efficiency of a particle trap. The method comprises the following steps: acquiring a carbon accumulation output value of the particle trap system in a preset monitoring period; comparing the carbon cumulative output value to a calibrated threshold; and when the carbon accumulation output value is smaller than the calibration threshold value, obtaining a monitoring result that the particle trap is low in trapping efficiency. By the mode, the PM sensor which is poor in measurement accuracy and unstable in signal feedback is avoided, the trapping efficiency of the particle trap can be monitored in real time according to the carbon accumulation output value in the preset monitoring period, the period is stable, and the technical problems that the monitoring process of the mode for monitoring the system performance of the particle trap is unstable and errors exist in the result in the prior art are solved.

Description

Method, device and equipment for monitoring trapping efficiency of particle trap and storage medium
Technical Field
The invention relates to the technical field of particle filtration of diesel vehicles, in particular to a method, a device, equipment and a storage medium for monitoring the trapping efficiency of a particle trap.
Background
The heavy diesel engine uses a DPF (diesel particulate trap) system to treat soot in exhaust gas, which has become the mainstream means of emission control at present, the DPF system absorbs soot in engine exhaust gas through a carrier, stores the soot particles on the DPF carrier, and when the soot is accumulated to a certain degree, the DPF system burns the soot on the carrier through a regeneration function to generate CO2 (carbon dioxide) which is discharged with the engine exhaust gas.
According to the requirements of the national six regulations, an OBD system (vehicle-mounted self-diagnosis system) has a function of monitoring the performance of a DPF system, the filtering performance of the DPF system on particulate matters is monitored in the DPF performance monitoring function, the concept of DPF efficiency is introduced, when the function of the DPF system is reduced and the emission of the particulate matters exceeds the OBD limit value, the DPF efficiency is judged to be low, and at the moment, a driver alarm system is activated to limit the vehicle torque. In the prior art, a PM sensor (particulate matter concentration sensor) is used for monitoring the filtering performance of the DPF system, i.e. the DPF performance is monitored by efficiency. The PM sensor is installed after the DPF catalyst for monitoring the particulate matter concentration in the exhaust gas. After the engine is started, the PM sensor enters into the initialization regeneration after the dew point is released, the temperature between the electrodes is increased, and the PM sensor enters into the measurement state after the regeneration is finished. As the engine runs, particles in the exhaust gas are gathered between the two electrodes of the PM sensor, so that the current between the electrodes is gradually increased, the PM sensor is regenerated after the current is larger than a certain limit value, and then the PM sensor enters a measuring stage again to work circularly. The DPF performance monitoring is judged by comparing the measured value of the PM sensor with a concentration threshold value, and when the measured value of the PM sensor is larger than the normal concentration threshold value, the DPF system trapping efficiency is judged to be low.
The prior art has the following disadvantages: the PM sensor needs to be initialized and regenerated before the measured value, the time is about 10 minutes, the whole monitoring period is 40-50 minutes, and the PM sensor needs to be regenerated again when the particulate matters are accumulated to a certain degree, so that the PM sensor can enter the working state again; multiple monitoring is needed, the monitoring period is long, the process is interrupted, and real-time monitoring cannot be achieved in the monitoring process; the PM sensor has poor measurement accuracy and unstable signal feedback, influences the final calculation result, and has high use cost.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a method, a device, equipment and a storage medium for monitoring the trapping efficiency of a particle trap, and aims to solve the technical problems that the monitoring process is unstable and the result has errors in the performance monitoring mode of a particle trap system in the prior art.
To achieve the above object, the present invention provides a method for monitoring the trapping efficiency of a particle trap, comprising the steps of:
acquiring a carbon accumulation output value of the particle trap system in a preset monitoring period;
comparing the carbon cumulative output value to a calibrated threshold;
and when the carbon accumulation output value is smaller than the calibration threshold value, obtaining a monitoring result that the particle trap is low in trapping efficiency.
Optionally, the obtaining the carbon accumulation output value of the particulate trap system in the preset monitoring period comprises:
obtaining a current period measurement value of the particle catcher system;
and when the current period measured value is larger than the period calibration threshold value, acquiring a carbon accumulation output value of the particle trap system.
Optionally, the obtaining a carbon accumulation output value of the particulate trap system when the current period measurement value is greater than a period calibration threshold value includes:
when the current period measured value is larger than the period calibration threshold value, acquiring the current pressure difference between the upstream and the downstream of the particle catcher system according to the pressure difference sensor;
determining a corresponding current carbon accumulation amount according to the current pressure difference;
acquiring historical carbon accumulation in a historical monitoring period from a preset storage unit;
and calculating an average carbon accumulation value according to the historical carbon accumulation amount and the current carbon accumulation amount, and taking the average carbon accumulation value as a carbon accumulation output value.
Optionally, the obtaining current cycle measurements of the particle trap system comprises:
acquiring the original carbon accumulation rate of the engine;
determining the original carbon emission accumulated amount of the engine according to the original carbon emission accumulated rate of the engine and the current accumulated time;
and taking the original emission accumulated carbon quantity of the engine as a current period measured value.
Optionally, after comparing the carbon accumulated output value with a calibrated threshold, the method further comprises:
when the carbon accumulation output value is larger than or equal to the calibration threshold value, obtaining a monitoring result that the trapping efficiency of the particle trap is normal;
the step of obtaining the carbon accumulation output value of the particulate trap system in the preset monitoring period is executed again.
Optionally, after obtaining the monitoring result that the particulate trap trapping efficiency is low when the carbon accumulation output value is smaller than the calibration threshold, the method further comprises:
and sending a prompt instruction to the instrument according to the monitoring result so that the instrument lights up a related prompt lamp according to the prompt instruction.
Optionally, before obtaining the carbon accumulated output value of the particulate trap system in the preset monitoring period, the method further comprises:
acquiring a target differential pressure measurement value according to a differential pressure sensor;
determining a target carbon accumulation rate for the virgin row and a current state of the particulate trap system;
acquiring the upstream temperature of the particle trap system according to the temperature sensor;
and when the target pressure difference measured value is in a preset pressure difference limit range, the target carbon accumulation rate is higher than a preset limit rate, the current state is an absorption working state, and the upstream temperature is in a preset temperature limit range, executing the step of acquiring the carbon accumulation output value of the particle trap system in a preset monitoring period.
In addition, in order to achieve the above object, the present invention further provides a device for monitoring the trapping efficiency of a particle trap, comprising:
the acquisition module is used for acquiring a carbon accumulation output value of the particle trap system in a preset monitoring period;
the comparison module is used for comparing the carbon accumulation output value with a calibration threshold value;
and the monitoring module is used for obtaining a monitoring result of low trapping efficiency of the particle trap when the carbon accumulation output value is smaller than the calibration threshold value.
In addition, in order to achieve the above object, the present invention also provides a particle trap trapping efficiency monitoring apparatus, including: a memory, a processor and a particle trap trapping efficiency monitoring program stored on the memory and executable on the processor, the particle trap trapping efficiency monitoring program being configured to implement the steps of the particle trap trapping efficiency monitoring method as described above.
In addition, to achieve the above object, the present invention further provides a storage medium having a particle trap trapping efficiency monitoring program stored thereon, which when executed by a processor implements the steps of the particle trap trapping efficiency monitoring method as described above.
The carbon accumulated output value of the particle trap system in a preset monitoring period is obtained; comparing the carbon cumulative output value to a calibrated threshold; and when the carbon accumulation output value is smaller than the calibration threshold value, obtaining a monitoring result that the particle trap is low in trapping efficiency. Through the mode, the carbon accumulation output value in the particle trap system is compared with the pre-calibrated calibration threshold value, the trapping efficiency of the particle trap system is monitored, the PM sensor which is poor in measurement accuracy and unstable in signal feedback is avoided, the trapping efficiency of the particle trap can be monitored in real time according to the carbon accumulation output value in the preset monitoring period, the period is stable, and the technical problems that the monitoring process of the mode for monitoring the performance of the particle trap system in the prior art is unstable and errors exist in the result are solved.
Drawings
FIG. 1 is a schematic diagram of a particle trap trapping efficiency monitoring device for a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a first embodiment of a method for monitoring the trapping efficiency of a particle trap according to the present invention;
FIG. 3 is a schematic flow chart of a method for monitoring the trapping efficiency of a particle trap according to a second embodiment of the present invention;
FIG. 4 is a schematic flow chart of a third embodiment of a method for monitoring the trapping efficiency of a particle trap according to the present invention;
fig. 5 is a block diagram of the first embodiment of the device for monitoring the trapping efficiency of the particle trap according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a particle trap trapping efficiency monitoring device in a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the particle trap trapping efficiency monitoring apparatus may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., a WIreless-FIdelity (WI-FI) interface). The Memory 1005 may be a Random Access Memory (RAM) Memory, or may be a Non-Volatile Memory (NVM), such as a disk Memory. The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration shown in fig. 1 does not constitute a limitation of the particulate trap trapping efficiency monitoring apparatus and may include more or fewer components than shown, or some components in combination, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a storage medium, may include therein an operating system, a network communication module, a user interface module, and a particle trap trapping efficiency monitoring program.
In the particle trap trapping efficiency monitoring apparatus shown in fig. 1, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 of the device for monitoring the trapping efficiency of the particle trap of the present invention may be disposed in the device for monitoring the trapping efficiency of the particle trap, and the device for monitoring the trapping efficiency of the particle trap calls the program for monitoring the trapping efficiency of the particle trap stored in the memory 1005 through the processor 1001 and executes the method for monitoring the trapping efficiency of the particle trap provided by the embodiment of the present invention.
Referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of the method for monitoring the trapping efficiency of a particle trap according to the present invention.
In this embodiment, the method for monitoring the trapping efficiency of the particle trap includes the following steps:
step S10: and acquiring a carbon accumulation output value of the particle trap system in a preset monitoring period.
It can be understood that the execution main body of the embodiment is a particle trap trapping efficiency monitoring device, the particle trap trapping efficiency monitoring device may be a device such as a Microprocessor (MCU) with a storage Unit and a computer, or an ECU (Electronic Control Unit, a vehicle-mounted computer), and when the particle trap trapping efficiency monitoring device is a device such as an MCU and a computer which are additionally arranged, a sensor signal on a vehicle where the particle trap system is located is obtained through a connection line with the vehicle-mounted computer, and the embodiment takes the ECU as an example for description.
The DPF system is a particulate trap system, and is composed of a differential pressure sensor, upstream and downstream temperature sensors, a DPF carrier, a package case, and the like. The preset monitoring period may be a time period corresponding to the DPF system being in the absorption state during the calibration process, or may be another period preset according to the maximum absorption carrying capacity, which is not limited in this embodiment. The carbon accumulation output value is the carbon accumulation of the particle trap system in a preset monitoring period, and can also be the average value of the carbon accumulation in the preset monitoring period and the carbon accumulation corresponding to other multiple monitoring periods. The carbon accumulation amount obtaining process can obtain the carbon accumulation amount in the preset monitoring period according to the running distance in the preset monitoring period and the relation coefficient by calibrating the relation coefficient between the running distance and the carbon accumulation amount in advance, and can also obtain the pressure difference according to a pressure difference sensor arranged on the upstream and downstream of the DPF system and determine the current carbon accumulation amount according to the mapping relation between the pressure difference calibrated in advance and the carbon accumulation amount.
Further, in order to ensure the accuracy of the monitoring result and make the monitoring process normal, before step S10, the method further includes: acquiring a target differential pressure measurement value according to a differential pressure sensor; determining a target carbon accumulation rate for the virgin row and a current state of the particulate trap system; acquiring the upstream temperature of the particle trap system according to the temperature sensor; when the target differential pressure measurement value is within a preset differential pressure limit range, the target carbon accumulation rate is higher than a preset limit rate, the current state is an absorption operation state, and the upstream temperature is within a preset temperature limit range, step S10 is performed.
It is understood that the preset pressure difference limit range, the preset limiting rate and the preset temperature limit range are relevant parameters which are set in advance according to actual conditions. When the target differential pressure measurement value is within a preset differential pressure limit range, the condition that the DPF system is not removed, blocked or damaged can be ensured; when the target carbon accumulation rate is higher than a preset limit rate, the working state of the transmitter can be ensured to be normal; when the current state is an absorption working state, the DPF system can be ensured to be in an absorption state rather than a release state; when the upstream temperature is within a preset temperature limit range, the DPF system can be ensured to be in a normal carbon accumulation working state.
Step S20: comparing the carbon cumulative output value to a calibrated threshold.
It can be understood that when it is determined through a plurality of sets of tests that the efficiency of the particle trap system meets the preset requirements in the calibration process, the corresponding carbon accumulation amount is determined according to the pressure difference data acquired by the pressure difference sensor and is stored as a calibration threshold value, and when the particle trap system is monitored, the calibration threshold value is called from the preset storage unit for comparison.
Further, in order to realize real-time monitoring of the trapping efficiency of the particle trap, so that the particle trap trapping efficiency monitoring process is more consistent, after step S20, the method further includes: when the carbon accumulation output value is larger than or equal to the calibration threshold value, obtaining a monitoring result that the trapping efficiency of the particle trap is normal; step S10 is re-executed.
Step S30: and when the carbon accumulation output value is smaller than the calibration threshold value, obtaining a monitoring result that the particle trap is low in trapping efficiency.
It can be understood that the calibration threshold is a carbon accumulation threshold obtained in the automobile development calibration process, and the minimum value or the average value of the thresholds obtained in multiple sets of calibration tests is taken. When the carbon accumulation output value is smaller than the calibration threshold value, the absorption efficiency is low at the moment, the carbon smoke stored in the DPF system is less, namely, the quantity of the original particles discharged by the engine absorbed by the DPF is smaller, and at the moment, the monitoring result that the trapping efficiency of the particle trap is low is obtained.
Further, after step S30, in order to enable the user to grasp the monitoring situation in real time, the method further includes: and sending a prompt instruction to the instrument according to the monitoring result so that the instrument lights up a related prompt lamp according to the prompt instruction.
It should be noted that the ECU continuously obtains the carbon accumulated output value of the particle trap system in the preset monitoring period, compares the carbon accumulated output value with the calibration threshold value, and when the carbon accumulated output value is smaller than the calibration threshold value, converts the prompt instruction into a CAN message to be broadcasted, the instrument identifies the CAN message, and lights the relevant prompt lamp according to the prompt instruction to warn the user that the trapping efficiency of the particle trap system is low.
In the embodiment, the carbon accumulation output value of the particle trap system in a preset monitoring period is obtained; comparing the carbon cumulative output value to a calibrated threshold; and when the carbon accumulation output value is smaller than the calibration threshold value, obtaining a monitoring result that the particle trap is low in trapping efficiency. Through the mode, the carbon accumulation output value in the particle trap system is compared with the pre-calibrated calibration threshold value, the trapping efficiency of the particle trap system is monitored, the PM sensor which is poor in measurement accuracy and unstable in signal feedback is avoided, the trapping efficiency of the particle trap can be monitored in real time according to the carbon accumulation output value in the preset monitoring period, the period is stable, and the technical problems that the monitoring process of the mode for monitoring the performance of the particle trap system in the prior art is unstable and errors exist in the result are solved.
Referring to fig. 3, fig. 3 is a schematic flow chart of a method for monitoring the trapping efficiency of a particle trap according to a second embodiment of the present invention.
Based on the first embodiment, the step S10 of the method for monitoring the trapping efficiency of the particle trap of the present embodiment includes:
step S101: current cycle measurements of the particle trap system are obtained.
It is understood that the current cycle measurement value can be the current carbon accumulation amount and can also be the original carbon accumulation amount of the engine. The specific acquisition process comprises the following steps: and determining the current time, calculating by a preset formula, and determining the current period measured value.
Specifically, in order to obtain a suitable monitoring period and make the test result more accurate, step S101 includes: acquiring the original carbon accumulation rate of the engine; determining the original carbon emission accumulated amount of the engine according to the original carbon emission accumulated rate of the engine and the current accumulated time; and taking the original emission accumulated carbon quantity of the engine as a current period measured value.
It should be noted that the original carbon emission accumulation rate of the engine refers to the original particulate emission rate of the engine, is determined by calibration in the automobile production process, and is stored in the preset storage unit, and the ECU can obtain the relevant calibration information of the vehicle through the preset storage unit. The current accumulated time refers to a time corresponding to a preset monitoring period from the beginning to the current moment, and a current period measurement value can be determined by a formula (1):
MZ═ dmdt formula (1)
Wherein M isZAnd dm is the original carbon accumulation rate of the engine and dt is the current accumulation time.
It will be appreciated that when carbon has accumulated to a certain amount, it is recorded as a period measurement MZThe original carbon emission of the engine is changed from 0 to MZThe course of values is defined as one monitoring period.
Step S102: and when the current period measured value is larger than the period calibration threshold value, acquiring a carbon accumulation output value of the particle trap system.
It will be appreciated that the value M is measured when the current cycle is presentZGradually increasing from 0 to MZGreater than a periodic calibration threshold MtJudging that a complete monitoring period is finished, and assigning the carbon accumulation amount of the period to the carbon accumulation amount M of the current period by the ECUiIn value, the output value of carbon accumulation M is carried outfAnd comparing the calculated value with a calibration threshold value M to determine whether a fault occurs. When one period is finished, the system immediately enters the monitoring of the next period and measures M for the periodZValue, current period carbon accumulation MiAnd clearing.
The embodiment determines the preset monitoring period through the current period measured value and the period calibration threshold value, and ensures the stability and accuracy of the monitoring period, thereby solving the technical problems that the monitoring process is unstable and the result has errors in the monitoring mode of monitoring the system performance of the particle catcher in the prior art.
Referring to fig. 4, fig. 4 is a schematic flow chart of a third embodiment of the method for monitoring the trapping efficiency of the particle trap according to the present invention.
Based on the first and second embodiments, the step S102 of the method for monitoring the trapping efficiency of the particle trap of the present embodiment includes:
step S103: and when the current period measured value is larger than the period calibration threshold value, acquiring the current pressure difference between the upstream and the downstream of the particle catcher system according to the pressure difference sensor.
It will be appreciated that when the current cycle measurement is greater than the cycle calibration threshold, the ECU determines that the cycle is over and determines the current differential pressure via a differential pressure sensor installed upstream and downstream of the DPF system.
Step S104: and determining the corresponding current carbon accumulation amount according to the current pressure difference.
It should be noted that, the pressure difference measured by the pressure difference sensor upstream and downstream of the DPF system is converted into the carbon accumulation amount in the DPF system by a calibration means, which can be understood as that a mapping relation table between the calibrated pressure difference and the carbon accumulation amount is stored in a preset storage unit, and when the ECU obtains the current pressure difference, the current carbon accumulation amount can be determined by looking up the mapping relation table.
Step S105: and acquiring the historical carbon accumulation amount in the historical monitoring period from a preset storage unit.
It can be understood that the historical carbon accumulation amount may be a carbon accumulation amount in a previous monitoring period in a current monitoring period, may also be a carbon accumulation amount in two previous monitoring periods, and may also be a carbon accumulation amount fixedly stored in advance, and this embodiment takes the historical carbon accumulation amount as the carbon accumulation amount in the two previous monitoring periods as an example for description. Mi-1Calculating the carbon accumulation amount of the ECU through the upstream and downstream pressure difference in the last monitoring period stored in a preset storage unit; mi-2The ECU calculates the carbon accumulation amount through the upstream and downstream pressure differences for the last two monitoring periods stored in the preset storage unit.
Step S106: and calculating an average carbon accumulation value according to the historical carbon accumulation amount and the current carbon accumulation amount, and taking the average carbon accumulation value as a carbon accumulation output value.
Note that the carbon cumulative output value is calculated by the formula (2):
Figure BDA0002794689320000091
wherein M isiThe carbon accumulation amount is calculated by the ECU through the upstream and downstream pressure difference in the current monitoring period; mi-1Calculating the carbon accumulation amount of the ECU through the upstream and downstream pressure difference in the last monitoring period stored in a preset storage unit; mi-2Calculating the carbon accumulation amount of the ECU through the upstream and downstream pressure difference in the last two monitoring periods stored in a preset storage unit; a. and b are all calculation coefficients.
It is understood that the carbon cumulative output value MfThe calculation is not limited to 3 monitoring periods, and the times of participating in the calculation period can be increased according to the actual situation, so that M is further enabledfThe value is more accurate, reduces the error.
In the concrete implementation, when the engine runs, the ECU continuously receives the differential pressure signal and converts the differential pressure signal into real-time carbon accumulation, and the carbon accumulation is frozen when a monitoring period is finished, wherein the freezing value is MiFreezing the value M for several cyclesiCalculating to obtain an output value MfThen outputs the value MfCompared with a calibrated threshold value M, e.g. MfIf the carbon absorption capacity of the DPF system is lower than the calibration threshold value, the system judges that the efficiency of an exhaust gas recirculation system (EGR system) is low, and a fault is reported.
This embodiment is expected to take about 20 minutes from cold start to completion of the calculation (i.e., 5 minutes for hot machine, about 15 minutes for three monitoring cycles, and as long as the ECU stores M for the last 2 monitoring cycles during the previous run)iValue, then only 1 monitoring cycle is needed to start detecting the fault) And the requirement of completing fault diagnosis in one OBD cycle (thermal WHTC cycle, 30min in the whole process) is met. And in the running process of the engine, the real-time monitoring can be realized without interruption.
In the embodiment, the carbon accumulation output value is calculated through the historical carbon accumulation and the current carbon accumulation, so that a more accurate carbon accumulation output value is obtained, and is used for comparing with the calibration threshold value to judge whether a fault exists, so that the technical problems that the monitoring process is unstable and the result has an error in the monitoring mode of monitoring the system performance of the particle trap in the prior art are solved.
Furthermore, an embodiment of the present invention further provides a storage medium, on which a particle trap trapping efficiency monitoring program is stored, which when executed by a processor implements the steps of the particle trap trapping efficiency monitoring method as described above.
Referring to fig. 5, fig. 5 is a block diagram illustrating a first embodiment of a device for monitoring trapping efficiency of a particle trap according to the present invention.
As shown in fig. 5, a device for monitoring the trapping efficiency of a particle trap according to an embodiment of the present invention includes:
the system comprises an obtaining module 10 for obtaining a carbon accumulation output value of the particulate trap system in a preset monitoring period.
The DPF system is a particulate trap system, and is composed of a differential pressure sensor, upstream and downstream temperature sensors, a DPF carrier, a package case, and the like. The preset monitoring period may be a time period corresponding to the DPF system being in the absorption state during the calibration process, or may be another period preset according to the maximum absorption carrying capacity, which is not limited in this embodiment. The carbon accumulation output value is the carbon accumulation of the particle trap system in a preset monitoring period, and can also be the average value of the carbon accumulation in the preset monitoring period and the carbon accumulation corresponding to other multiple monitoring periods. The carbon accumulation amount obtaining process can obtain the carbon accumulation amount in the preset monitoring period according to the running distance in the preset monitoring period and the relation coefficient by calibrating the relation coefficient between the running distance and the carbon accumulation amount in advance, and can also obtain the pressure difference according to a pressure difference sensor arranged on the upstream and downstream of the DPF system and determine the current carbon accumulation amount according to the mapping relation between the pressure difference calibrated in advance and the carbon accumulation amount.
Further, in order to ensure the normal monitoring process and the accuracy of the monitoring result, the obtaining module 10 is configured to obtain a target differential pressure measurement value according to the differential pressure sensor; determining a target carbon accumulation rate for the virgin row and a current state of the particulate trap system; acquiring the upstream temperature of the particle trap system according to the temperature sensor; and when the target pressure difference measured value is in a preset pressure difference limit range, the target carbon accumulation rate is higher than a preset limit rate, the current state is an absorption working state, and the upstream temperature is in a preset temperature limit range, executing the step of acquiring the carbon accumulation output value of the particle trap system in a preset monitoring period.
It is understood that the preset pressure difference limit range, the preset limiting rate and the preset temperature limit range are relevant parameters which are set in advance according to actual conditions. When the target differential pressure measurement value is within a preset differential pressure limit range, the condition that the DPF system is not removed, blocked or damaged can be ensured; when the target carbon accumulation rate is higher than a preset limit rate, the working state of the transmitter can be ensured to be normal; when the current state is an absorption working state, the DPF system can be ensured to be in an absorption state rather than a release state; when the upstream temperature is within a preset temperature limit range, the DPF system can be ensured to be in a normal carbon accumulation working state.
A comparison module 20 for comparing the carbon accumulated output value with a calibrated threshold.
It can be understood that when it is determined through a plurality of sets of tests that the efficiency of the particle trap system meets the preset requirements in the calibration process, the corresponding carbon accumulation amount is determined according to the pressure difference data acquired by the pressure difference sensor and is stored as a calibration threshold value, and when the particle trap system is monitored, the calibration threshold value is called from the preset storage unit for comparison.
Further, in order to monitor the capturing efficiency of the particle trap in real time and make the monitoring process of the capturing efficiency of the particle trap more coherent, the comparing module 20 is further configured to obtain a monitoring result that the capturing efficiency of the particle trap is normal when the carbon accumulation output value is greater than or equal to the calibration threshold value; the step of obtaining the carbon accumulation output value of the particulate trap system in the preset monitoring period is executed again.
And the monitoring module 30 is configured to obtain a monitoring result that the particle trap is low in trapping efficiency when the carbon accumulation output value is smaller than the calibration threshold.
It can be understood that the calibration threshold is a carbon accumulation threshold obtained in the automobile development calibration process, and the minimum value or the average value of the thresholds obtained in multiple sets of calibration tests is taken. When the carbon accumulation output value is smaller than the calibration threshold value, the absorption efficiency is low at the moment, the carbon smoke stored in the DPF system is less, namely, the quantity of the original particles discharged by the engine absorbed by the DPF is smaller, and at the moment, the monitoring result that the trapping efficiency of the particle trap is low is obtained.
Further, in order to enable the user to grasp the monitoring condition in real time, the monitoring module 30 is further configured to send a prompt instruction to the meter according to the monitoring result, so that the meter lights up the relevant prompt lamp according to the prompt instruction.
It should be noted that the ECU continuously obtains the carbon accumulated output value of the particle trap system in the preset monitoring period, compares the carbon accumulated output value with the calibration threshold value, and when the carbon accumulated output value is smaller than the calibration threshold value, converts the prompt instruction into a CAN message to be broadcasted, the instrument identifies the CAN message, and lights the relevant prompt lamp according to the prompt instruction to warn the user that the trapping efficiency of the particle trap system is low.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited thereto.
In the embodiment, the carbon accumulation output value of the particle trap system in a preset monitoring period is obtained; comparing the carbon cumulative output value to a calibrated threshold; and when the carbon accumulation output value is smaller than the calibration threshold value, obtaining a monitoring result that the particle trap is low in trapping efficiency. Through the mode, the carbon accumulation output value in the particle trap system is compared with the pre-calibrated calibration threshold value, the trapping efficiency of the particle trap system is monitored, the PM sensor which is poor in measurement accuracy and unstable in signal feedback is avoided, the trapping efficiency of the particle trap can be monitored in real time according to the carbon accumulation output value in the preset monitoring period, the period is stable, and the technical problems that the monitoring process of the mode for monitoring the performance of the particle trap system in the prior art is unstable and errors exist in the result are solved.
It should be noted that the above-described work flows are only exemplary, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to actual needs, and the present invention is not limited herein.
In addition, the technical details that are not elaborated in this embodiment can be referred to the method for monitoring the trapping efficiency of the particle trap provided by any embodiment of the present invention, and are not described herein again.
In an embodiment, the obtaining module 10 is further configured to obtain a current period measurement value of the particle trap system;
and when the current period measured value is larger than the period calibration threshold value, acquiring a carbon accumulation output value of the particle trap system.
In an embodiment, the obtaining module 10 is further configured to obtain, according to a differential pressure sensor, a current differential pressure upstream and downstream of the particulate trap system when the current cycle measurement value is greater than a cycle calibration threshold value;
determining a corresponding current carbon accumulation amount according to the current pressure difference;
acquiring historical carbon accumulation in a historical monitoring period from a preset storage unit;
and calculating an average carbon accumulation value according to the historical carbon accumulation amount and the current carbon accumulation amount, and taking the average carbon accumulation value as a carbon accumulation output value.
In one embodiment, the obtaining module 10 is further configured to obtain an engine raw carbon accumulation rate;
determining the original carbon emission accumulated amount of the engine according to the original carbon emission accumulated rate of the engine and the current accumulated time;
and taking the original emission accumulated carbon quantity of the engine as a current period measured value.
Further, it is to be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g. Read Only Memory (ROM)/RAM, magnetic disk, optical disk), and includes several instructions for enabling a terminal device (e.g. a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A method for monitoring the trapping efficiency of a particle trap, the method comprising:
acquiring a carbon accumulation output value of the particle trap system in a preset monitoring period;
comparing the carbon cumulative output value to a calibrated threshold;
and when the carbon accumulation output value is smaller than the calibration threshold value, obtaining a monitoring result that the particle trap is low in trapping efficiency.
2. The method for monitoring the trapping efficiency of a particle trap system according to claim 1, wherein said obtaining a carbon accumulation output value of the particle trap system over a predetermined monitoring period comprises:
obtaining a current period measurement value of the particle catcher system;
and when the current period measured value is larger than the period calibration threshold value, acquiring a carbon accumulation output value of the particle trap system.
3. The method of monitoring particulate trap trapping efficiency according to claim 2, wherein said obtaining a carbon accumulation output value of a particulate trap system when said current cycle measurement value is greater than a cycle calibration threshold value comprises:
when the current period measured value is larger than the period calibration threshold value, acquiring the current pressure difference between the upstream and the downstream of the particle catcher system according to the pressure difference sensor;
determining a corresponding current carbon accumulation amount according to the current pressure difference;
acquiring historical carbon accumulation in a historical monitoring period from a preset storage unit;
and calculating an average carbon accumulation value according to the historical carbon accumulation amount and the current carbon accumulation amount, and taking the average carbon accumulation value as a carbon accumulation output value.
4. The method of monitoring particulate trap trapping efficiency according to claim 2, wherein said obtaining a current cycle measurement of the particulate trap system comprises:
acquiring the original carbon accumulation rate of the engine;
determining the original carbon emission accumulated amount of the engine according to the original carbon emission accumulated rate of the engine and the current accumulated time;
and taking the original emission accumulated carbon quantity of the engine as a current period measured value.
5. The particulate trap trapping efficiency monitoring method of claim 1, wherein after comparing the carbon cumulative output value to a calibrated threshold, the method further comprises:
when the carbon accumulation output value is larger than or equal to the calibration threshold value, obtaining a monitoring result that the trapping efficiency of the particle trap is normal;
the step of obtaining the carbon accumulation output value of the particulate trap system in the preset monitoring period is executed again.
6. The method of monitoring particulate trap trapping efficiency according to claim 1, wherein after obtaining a monitoring result of particulate trap trapping efficiency being low when the carbon cumulative output value is less than the calibrated threshold, the method further comprises:
and sending a prompt instruction to the instrument according to the monitoring result so that the instrument lights up a related prompt lamp according to the prompt instruction.
7. The method of any one of claims 1-6, wherein prior to obtaining the carbon accumulation output of the particulate trap system over a predetermined monitoring period, the method further comprises:
acquiring a target differential pressure measurement value according to a differential pressure sensor;
determining a target carbon accumulation rate for the virgin row and a current state of the particulate trap system;
acquiring the upstream temperature of the particle trap system according to the temperature sensor;
and when the target pressure difference measured value is in a preset pressure difference limit range, the target carbon accumulation rate is higher than a preset limit rate, the current state is an absorption working state, and the upstream temperature is in a preset temperature limit range, executing the step of acquiring the carbon accumulation output value of the particle trap system in a preset monitoring period.
8. A particle trap trapping efficiency monitoring device, comprising:
the acquisition module is used for acquiring a carbon accumulation output value of the particle trap system in a preset monitoring period;
the comparison module is used for comparing the carbon accumulation output value with a calibration threshold value;
and the monitoring module is used for obtaining a monitoring result of low trapping efficiency of the particle trap when the carbon accumulation output value is smaller than the calibration threshold value.
9. A particle trap trapping efficiency monitoring apparatus, characterized in that the apparatus comprises: a memory, a processor, and a particle trap trapping efficiency monitoring program stored on the memory and executable on the processor, the particle trap trapping efficiency monitoring program being configured to implement the steps of the particle trap trapping efficiency monitoring method of any one of claims 1-7.
10. A storage medium having stored thereon a particle trap trapping efficiency monitoring program that, when executed by a processor, implements the steps of the particle trap trapping efficiency monitoring method of any one of claims 1-7.
CN202011342916.7A 2020-11-24 2020-11-24 Method, device and equipment for monitoring trapping efficiency of particle trap and storage medium Active CN112412600B (en)

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CN113356987A (en) * 2021-06-18 2021-09-07 广西玉柴机器股份有限公司 DPF (diesel particulate filter) trapping efficiency low diagnosis method based on DPF equivalent pressure difference
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