CN112282904A - Method for detecting voltage build-up fault of SCR system - Google Patents

Method for detecting voltage build-up fault of SCR system Download PDF

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CN112282904A
CN112282904A CN202011187506.XA CN202011187506A CN112282904A CN 112282904 A CN112282904 A CN 112282904A CN 202011187506 A CN202011187506 A CN 202011187506A CN 112282904 A CN112282904 A CN 112282904A
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urea
scr
collected
ecu
judging
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CN112282904B (en
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陈一平
丁润莹
蔡继业
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Shanghai Xingrong Automotive Technology Co ltd
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Shanghai Xingrong Automotive Technology Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1808—Pressure
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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 relates to a method for detecting a voltage build-up fault of an SCR system, which comprises the following steps: collecting the working state of a urea pump, the duty ratio of the urea pump and the liquid level percentage of a urea tank at each time point, which are collected by an ECU of a vehicle; each diagnostic cycle t0Summarizing the data from the end of the last diagnosis period to the current time, and respectively analyzing and judging according to the data types; and outputting the judgment result of the step two through a human-computer interaction interface. The advantages are that: the utilized parameters are more comprehensive, the multidirectional comprehensive analysis can be performed on the reasons of the situation that the pressure build-up of the SCR system device fails or is completely not built, the analysis process is more scientific, and the analysis result is more accurate and specific. Because only one vehicle-mounted terminal is used as a collecting tool in the process of extracting data and only the data in the ECU is read, the condition that a plurality of sensors need to be respectively docked does not exist, and the difficulty of installation and maintenance is greatly reduced.

Description

Method for detecting voltage build-up fault of SCR system
Technical Field
The invention relates to the field of automobile post-processing systems, in particular to a method for detecting a voltage build-up fault of an SCR system.
Background
With the continuous development and growth of automobile industry in China, the market share of commercial vehicles is also continuously promoted, and the demand and delivery of diesel engines serving as main power sources of the commercial vehicles are also increased year by year. The diesel engine has sufficient discharge capacity, excellent dynamic property and excellent fuel economy, and simultaneously has high pollution to the environment, so that the diesel engine becomes a problem to be solved urgently for vehicle emission control in China, China also starts to implement the national VI-stage emission standard of heavy diesel engines in the range of China from 7/1.2019, and manufacturers often adopt an SCR tail gas treatment system to reduce emission in order to achieve the purpose of reducing pollution in the working process of the diesel engine.
Selective Catalytic Reduction, SCR for short, is a technical principle of selectively reducing nitrogen oxides to nitrogen and water in an oxygen-rich environment by using a reducing agent under the action of a catalyst.
When the SCR system works, the SCR system sequentially goes through three processes of pressure building, injection and back pumping. In the pressure building process, building pressure by a urea pump, and maintaining the urea pressure at about normal working pressure after the urea pressure is slowly increased; when the pressure of the system is built up, the system pressure is maintained at the normal working pressure, when the system meets the injection condition, the engine control unit or the DCU sends out a urea nozzle opening instruction, when the engine works, the reverse pumping stage is carried out, and in order to prevent the urea crystal in the pipeline from being blocked, the pump can suck the residual urea in the pipeline and the nozzle back into the urea tank.
Exhaust temperature does not reach standard, the urea incasement temperature is crossed lowly and is leaded to urea crystallization and urea incasement urea solution liquid level to cross lowly and all can lead to the urea pump to appear building the pressure failure even can't build the trouble of pressure when pressing, can make the unable normal urea solution that discharges of SCR system be used for and get rid of waste gas and carry out redox reaction and eliminate its pollution when these troubles appear, this one side can cause a large amount of pollutions to the environment, on the other hand exhaust gas is not up to standard also can lead to the mistake of engine OBD system report and restrict the maximum output torque of engine, this efficiency that not only can reduce the vehicle operation, still can cause the influence to the security and the stability of driving, reduce driving efficiency, harm driving safety.
In the prior art, whether a urea pump in an SCR system breaks down or not can be determined only through single parameters such as urea solution pressure or urea pump duty ratio, but the system specific analysis on the fault cause can not be performed through multi-parameter analysis.
Disclosure of Invention
The invention aims to provide a detection method of the pressure build-up fault of an SCR system aiming at the defects of the prior art, and the pressure build-up fault of an SCR system device is judged by comprehensively analyzing various extracted pressures, temperatures, liquid levels and fault codes.
In order to achieve the above purpose, the method for detecting a voltage build-up fault of an SCR system according to an embodiment of the present invention is implemented by the following technical solutions:
1. a detection method for voltage build-up fault of SCR system is characterized by comprising the following steps:
collecting the working state of a urea pump, the duty ratio of the urea pump and the liquid level percentage of a urea box at each time point, which are collected by an ECU of a vehicle;
step two, passing one diagnosis period t every time0Summarizing the data from the end of the last diagnosis period to the current time, and respectively analyzing and judging according to the data types, specifically:
the current diagnosis period t0All the urea pump working states S collected in the device are collected and deduplicated, and whether a specific working state S exists or not is searchedJug: if the working state is not collected, judging that the voltage is not tried to be built; if the working state is collected, and the specific working state S is not searchedJugIf so, judging that the voltage building fails; if the working state is detected and the specific working state S can be searchedJugJudging that the detection result is 'passing through the working state detection of the urea pump';
the current diagnosis period t0Summarizing all urea pump duty ratios D collected in the process, if all the urea pump duty ratios D are 0, judging that the urea pump duty ratios D are not tried to build pressure, and if the urea pump duty ratios D have values other than 0, judging that the urea pump duty ratios D are detected;
the current diagnosis period t0All urea box liquid level percentages R collected in the tank are summarized, and the maximum value R in the urea box liquid level percentages is selectedmaxPercentage of the standard minimum urea tank liquid levelRSminBy comparison, if R ismax＜RSminJudging that the liquid level percentage of the urea box does not reach the standard; such as Rmax≥RSminJudging that the liquid level percentage of the urea box reaches the standard "
And step three, outputting the judgment result of the step two through a human-computer interaction interface.
The first step further comprises collecting SCR upstream exhaust temperature at each time point collected by a vehicle ECU;
the second step further comprises: the current diagnosis period t0Internal trapped all SCR upstream exhaust temperature TGSummarizing and selecting the maximum value TGmaxAnd the standard minimum SCR upstream exhaust temperature TSGminBy comparison, if TGmax＜TSGminJudging that the SCR upstream exhaust temperature does not reach the standard; such as TGmax≥TSGminAnd judging that the SCR upstream exhaust temperature reaches the standard.
The first step also comprises collecting the temperature parameters of the urea box at each time point, which are collected by an ECU of the vehicle;
the second step further comprises: the current diagnosis period t0All urea tank temperatures T collected internallyBSummarizing and selecting the maximum value TBmaxAnd the standard minimum urea box temperature TSBminBy comparison, if TBmax＜TSBminJudging that the temperature of the urea box does not reach the standard; such as TBmax≥TSBminAnd judging that the temperature of the urea box reaches the standard.
The first step also comprises collecting equipment fault codes of each time point collected by the vehicle ECU;
the second step further comprises: a diagnosis period t0And comparing all the collected equipment fault codes with a standard fault code library to obtain the faults represented by the equipment fault codes.
The first step also comprises the following steps: installing a vehicle-mounted terminal for collecting designated data in an ECU on a vehicle, and establishing wireless communication connection between the vehicle-mounted terminal and a cloud server; and establishing ECU models of various automobile brands, corresponding equipment fault codes and specific working state S of the urea pumpJugStandard minimum SCR upstream exhaust temperature TSGminStandard minimum urea tank liquid level percentage RSminStandard minimum urea tank temperature TSBminThe corresponding relation between the SCR parameter tables and the SCR parameter tables is generated, and the SCR parameter tables correspond to the brand and the model of the automobile; pre-storing the SCR parameter table in the cloud server;
in addition, the vehicle-mounted terminal executes the first step, collects the type information of the ECU, and uploads the collected working state of the urea pump, the duty ratio of the urea pump, the liquid level percentage of the urea tank, the exhaust temperature at the upstream of the SCR, the temperature parameter of the urea tank, an equipment fault code and the type information of the ECU to the cloud server; and the cloud server executes a second step based on the ECU model information and the SCR parameter table.
The vehicle-mounted terminal collects the designated data in the ECU once every parameter extraction period t and uploads the data to the cloud server; said t is0Is a positive integer multiple of t.
The invention has the advantages that:
the utilized parameters are more comprehensive, the multidirectional comprehensive analysis can be performed on the reasons of the situation that the pressure build-up of the SCR system device fails or is completely not built, the analysis process is more scientific, and the analysis result is more accurate and specific.
Because only one vehicle-mounted terminal is used as a collecting tool in the process of extracting data and only the data in the ECU is read, the condition that a plurality of sensors need to be respectively docked does not exist, and the difficulty of installation and maintenance is greatly reduced.
Drawings
The above features and advantages of the present invention will become more apparent and readily appreciated from the following description of the exemplary embodiments thereof taken in conjunction with the accompanying drawings.
FIG. 1 is a system diagram illustrating a method for detecting a voltage build-up fault in an SCR system according to an embodiment of the present invention;
FIG. 2 is a logic diagram of a method for detecting a voltage build-up fault of an SCR system according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1-2, in an embodiment of the present invention, to implement monitoring and comprehensive analysis of multiple parameters, a method for detecting a voltage build-up fault of an SCR system is provided, where parameters in an ECU and a sensor of a vehicle need to be extracted, and parameters mainly related in an embodiment of the present invention include: the method comprises the following steps of firstly, equipment fault codes, secondly, the working state of a urea pump, thirdly, the duty ratio of the urea pump, fourthly, the exhaust temperature at the upstream of an SCR, sixth, the liquid level percentage of a urea tank and sixth, the temperature of the urea tank. Relevant parameters collected in an ECU (electronic control unit) are extracted in the process of fault detection of an automotive SCR system device by combining multiple parameters, and the description parameters are as follows:
metering parameters:
device fault code
② the working state S of the urea pump, the specific working state is SJug
③ duty ratio D of urea pump
Fourthly, SCR upstream exhaust temperature TGStandard minimum SCR upstream exhaust temperature TSGmin
The percentage of the liquid level in the urea box is R, and the percentage of the liquid level in the standard lowest urea box is RSmin
Temperature T of urea boxBStandard minimum urea tank temperature TSBmin
Time parameters: parameter extraction period t
② diagnosis period t0
The main inventive concept is as follows: installing a vehicle-mounted terminal on a vehicle to collect specified data in the ECU, wherein the vehicle-mounted terminal (telematics box) is connected with an OBD port of the vehicle; and the wireless transmission module is used for transmitting data with the cloud server. After the vehicle-mounted terminal and the cloud server are in wireless communication connection, the vehicle-mounted terminal uploads data to the cloud server (as shown in fig. 1), the cloud server collects parameters once every a period of time, packs all the parameters collected within a certain period of time according to types, transversely analyzes each parameter at each time point and makes judgment respectively.
The specific implementation method comprises the following steps:
the method comprises the following steps:
and installing a vehicle-mounted terminal for collecting specified data in the ECU on the vehicle, and establishing wireless communication connection between the vehicle-mounted terminal and the cloud server.
Establishing a corresponding relation between each automobile brand ECU model and corresponding metering parameters, wherein the metering parameters comprise: equipment fault code and urea pump specific working state SJugStandard minimum SCR upstream exhaust temperature TSGminStandard minimum urea tank liquid level percentage RSminStandard minimum urea tank temperature TSBmin. And generating an SCR parameter table corresponding to the brand and the model of the automobile according to the corresponding relation. And then, pre-storing an SCR parameter table in the cloud server. Based on the SCR parameter table, the cloud server can quickly acquire the metering parameter data of the vehicle type corresponding to the ECU model according to the acquired ECU model.
The method comprises the following steps:
and the cloud server sends a command required by the interaction with the ECU to the vehicle-mounted terminal according to the requirement.
The vehicle-mounted terminal sends the command received from the cloud server to an ECU of the vehicle and receives data (urea pump working state, urea pump duty ratio, urea tank liquid level percentage, SCR upstream exhaust temperature, urea tank temperature parameters and equipment fault codes) replied by the ECU to each command.
And then the vehicle-mounted terminal marks each piece of data replied by the ECU according to the time received by the vehicle-mounted terminal and stores the data in a cache region of the vehicle-mounted terminal.
And the vehicle-mounted terminal packs and sends the data replied by the ECU to the cloud server according to the parameter extraction period t required by the cloud server.
Step two:
the cloud server passes one diagnosis period t each time0The last diagnostic cycle is ended and the current i group is processed0T, t is t0Positive integer multiple of) data, and dividing the data into different parts according to the difference of the data types:
2.1 device Fault codes
A diagnosis period t0Comparing all the collected equipment fault codes with a standard fault code library, converting the collected fault codes into corresponding faults, and outputting the corresponding faults as the judgment result.
2.2 operating State S of Urea Pump
A diagnosis period t0All urea pump operating conditions S collected internally (e.g. S)1、S2…Si) Summarizing, removing the weight of the urea solution, and comparing the urea solution with the complete working state in a standard urea pump working state library, wherein the three conditions are as follows:
2.2.1 if the urea pump does not attempt to build the pressure, and the effective working state is not collected in the bag, judging that the urea pump does not attempt to build the pressure;
2.2.2 if the pressure build-up fails after the pressure build-up is attempted, the specific working state S is lacked in the packet although the effective working state parameters are collectedJugSo that the specific operating state S cannot be retrievedJugIf so, judging that the voltage building fails;
2.2.3 if the urea pump can build pressure successfully, the working state of the urea pump before the pressure building is complete, and the specific working state S is still contained after the urea pump working state collected in the bag is removed from the weightJugThus, it is possible to detect an operating state and also to retrieve a specific operating state SJugThen, it is judged that "detection of the operating state of the urea pump is passed".
2.3 Urea Pump Duty ratio D
When the urea pump proportion is always 0, the urea pump proportion represents that the urea pump proportion is never operated, and if a parameter which is not 0 is collected, the urea pump proportion represents that the urea pump proportion tries to build pressure.
A diagnosis period t0All urea pump duty D (e.g. D) collected internally1、D2…Di) Summarizing, if all the voltage values are 0, judging that the voltage is not tried to build; if it tries to build a voltage, whether it is eventually successful or failed, and there is data other than 0 in its packet, so it can detect a value other than 0, then it is judged "detected by the urea pump duty cycle"
2.4SCR upstream exhaust temperature TG
When the exhaust temperature at the upstream of the SCR is too low, the SCR system of the SCR device can determine that the SCR system does not meet the working condition and does not work, so that the exhaust temperature at the upstream of the SCR device is higher than a certain value when the SCR device is required to work normally.
Will be oneDiagnostic period t0Internal trapped all SCR upstream exhaust temperature TG(e.g. T)G1、TG2…TGi) Summarizing and selecting the maximum value TGmaxAnd the standard minimum SCR upstream exhaust temperature TSGminBy comparison, if TGmax＜TSGminJudging that the SCR upstream exhaust temperature does not reach the standard; such as TGmax≥TSGminIf so, judging that the SCR upstream exhaust temperature reaches the standard "
2.5 percent of liquid level R of urea tank
When the urea solution in the urea box is too little, namely the liquid level percentage of the urea solution is too low, the SCR of the urea box can not ensure the amount of the urea solution required by the basically normal work, the SCR system can not work normally because of insufficient urea solution, and the system needs to have sufficient urea solution when working normally, namely the liquid level percentage of the urea box is at least higher than a certain value.
A diagnosis period t0Percentage R (e.g. R) of all urea tank levels collected internally1、R2…Ri) Sum up and select the maximum value RmaxPercentage of liquid level R of standard lowest urea boxSminBy comparison, if R ismax＜RSminJudging that the liquid level percentage of the urea box does not reach the standard; such as Rmax≥RSminJudging that the liquid level percentage of the urea box reaches the standard "
2.6 Urea tank temperature TB
When the temperature in the urea box is too low, the urea solution is likely to crystallize into urea crystals and block a urea delivery pipe and a liquid inlet/outlet, and at the moment, in order to ensure the stable and safe operation of the device, the SCR system can determine that the SCR system does not work because the SCR system does not meet working conditions, and the system is expected to work normally, so that the temperature in the urea box is required to be higher than a certain value, and the urea solution is not likely to crystallize, thereby meeting the working requirement.
A diagnosis period t0All urea tank temperatures T collected internallyB(e.g. T)B1、TB2…TBi) Summarizing and selecting the maximum value TBmaxAnd the standard minimum urea box temperature TSBminCompare if, ifTBmax＜TSBminJudging that the temperature of the urea box does not reach the standard; such as TBmax≥TSBminAnd judging that the temperature of the urea box reaches the standard.
Of note in data processing are: the analysis of these six parameters is judged to be performed in parallel, independent of each other, without interfering with each other, and simultaneously.
Step three:
and after all judgment and analysis processes are finished, taking the final results after the six parameters are judged as final display results, and uniformly outputting the final display results so as to carry out technical judgment on the comprehensive faults of the SCR system device.
The invention has the advantages that:
the utilized parameters are more comprehensive, the multidirectional comprehensive analysis can be performed on the reasons of the situation that the pressure build-up of the SCR system device fails or is completely not built, the analysis process is more scientific, and the analysis result is more accurate and specific.
Because only one vehicle-mounted terminal is used as a collecting tool in the process of extracting data and only the data in the ECU is read, the condition that a plurality of sensors need to be respectively docked does not exist, and the difficulty of installation and maintenance is greatly reduced.
Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that the above embodiments are only one of the preferred embodiments of the present invention, and not all embodiments can be enumerated herein for the sake of brevity, and any embodiment that can embody the claims of the present invention is within the protection scope of the present invention.

Claims (6)

1. A detection method for voltage build-up fault of SCR system is characterized by comprising the following steps:
collecting the working state of a urea pump, the duty ratio of the urea pump and the liquid level percentage of a urea box at each time point, which are collected by an ECU of a vehicle;
step two, passing one diagnosis period t every time0Will be selected fromSummarizing the data when the last diagnosis period is finished, and respectively analyzing and judging according to the data types, specifically:
the current diagnosis period t0All the urea pump working states S collected in the device are collected and deduplicated, and whether a specific working state S exists or not is searchedJug: if the working state is not collected, judging that the voltage is not tried to be built; if the working state is collected, and the specific working state S is not searchedJugIf so, judging that the voltage building fails; if the working state is detected and the specific working state S can be searchedJugJudging that the detection result is 'passing through the working state detection of the urea pump';
the current diagnosis period t0Summarizing all urea pump duty ratios D collected in the process, if all the urea pump duty ratios D are 0, judging that the urea pump duty ratios D are not tried to build pressure, and if the urea pump duty ratios D have values other than 0, judging that the urea pump duty ratios D are detected;
the current diagnosis period t0All urea box liquid level percentages R collected in the tank are summarized, and the maximum value R in the urea box liquid level percentages is selectedmaxPercentage of liquid level R of standard lowest urea boxSminBy comparison, if R ismax＜RSminJudging that the liquid level percentage of the urea box does not reach the standard; such as Rmax≥RSminJudging that the liquid level percentage of the urea box reaches the standard "
And step three, outputting the judgment result of the step two through a human-computer interaction interface.
2. The method for detecting the voltage build-up fault of the SCR system according to claim 1, wherein:
the first step further comprises collecting SCR upstream exhaust temperature at each time point collected by a vehicle ECU;
the second step further comprises: the current diagnosis period t0Internal trapped all SCR upstream exhaust temperature TGSummarizing and selecting the maximum value TGmaxAnd the standard minimum SCR upstream exhaust temperature TSGminBy comparison, if TGmax＜TSGminJudging that the SCR upstream exhaust temperature does not reach the standard; such asTGmax≥TSGminAnd judging that the SCR upstream exhaust temperature reaches the standard.
3. The method for detecting the voltage build-up fault of the SCR system according to claim 2, wherein:
the first step also comprises collecting the temperature parameters of the urea box at each time point, which are collected by an ECU of the vehicle;
the second step further comprises: the current diagnosis period t0All urea tank temperatures T collected internallyBSummarizing and selecting the maximum value TBmaxAnd the standard minimum urea box temperature TSBminBy comparison, if TBmax＜TSBminJudging that the temperature of the urea box does not reach the standard; such as TBmax≥TSBminAnd judging that the temperature of the urea box reaches the standard.
4. The method for detecting the voltage build-up fault of the SCR system according to claim 3, wherein:
the first step also comprises collecting equipment fault codes of each time point collected by the vehicle ECU;
the second step further comprises: a diagnosis period t0And comparing all the collected equipment fault codes with a standard fault code library to obtain the faults represented by the equipment fault codes.
5. The method for detecting the voltage build-up fault of the SCR system according to claim 4, wherein the step one is preceded by the step of: installing a vehicle-mounted terminal for collecting designated data in an ECU on a vehicle, and establishing wireless communication connection between the vehicle-mounted terminal and a cloud server; and establishing ECU models of various automobile brands, corresponding equipment fault codes and specific working state S of the urea pumpJugStandard minimum SCR upstream exhaust temperature TSGminStandard minimum urea tank liquid level percentage RSminStandard minimum urea tank temperature TSBminThe corresponding relation between the SCR parameter tables and the SCR parameter tables is generated, and the SCR parameter tables correspond to the brand and the model of the automobile; pre-storing the SCR parameter table in the cloud server;
in addition, the vehicle-mounted terminal executes the first step, collects the type information of the ECU, and uploads the collected working state of the urea pump, the duty ratio of the urea pump, the liquid level percentage of the urea tank, the exhaust temperature at the upstream of the SCR, the temperature parameter of the urea tank, an equipment fault code and the type information of the ECU to the cloud server; and the cloud server executes a second step based on the ECU model information and the SCR parameter table.
6. The method for detecting the voltage build-up fault of the SCR system according to claim 5, wherein the vehicle-mounted terminal collects the designated data in the ECU once every parameter extraction period t and uploads the data to the cloud server; said t is0Is a positive integer multiple of t.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113009903A (en) * 2021-02-22 2021-06-22 一汽解放汽车有限公司 Fault diagnosis method and device, vehicle and storage medium

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105673147A (en) * 2016-01-22 2016-06-15 潍柴动力股份有限公司 Pressure building method and device of SCR system
CN207249480U (en) * 2017-10-19 2018-04-17 广州城市职业学院 A kind of SCR device fault detection system
CN110953055A (en) * 2019-12-11 2020-04-03 潍柴动力股份有限公司 Fault detection method and device for urea pump
US20200116068A1 (en) * 2013-05-08 2020-04-16 Cummins Ip, Inc. Exhaust aftertreatment system diagnostic and conditioning
CN111828152A (en) * 2020-08-31 2020-10-27 上海星融汽车科技有限公司 Method for identifying filter element blockage of aftertreatment system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200116068A1 (en) * 2013-05-08 2020-04-16 Cummins Ip, Inc. Exhaust aftertreatment system diagnostic and conditioning
CN105673147A (en) * 2016-01-22 2016-06-15 潍柴动力股份有限公司 Pressure building method and device of SCR system
CN207249480U (en) * 2017-10-19 2018-04-17 广州城市职业学院 A kind of SCR device fault detection system
CN110953055A (en) * 2019-12-11 2020-04-03 潍柴动力股份有限公司 Fault detection method and device for urea pump
CN111828152A (en) * 2020-08-31 2020-10-27 上海星融汽车科技有限公司 Method for identifying filter element blockage of aftertreatment system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113009903A (en) * 2021-02-22 2021-06-22 一汽解放汽车有限公司 Fault diagnosis method and device, vehicle and storage medium

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