WO2018218533A1 - Diagnosis method and diagnosis device for src exhaust gas aftertreatment system - Google Patents

Diagnosis method and diagnosis device for src exhaust gas aftertreatment system Download PDF

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Publication number
WO2018218533A1
WO2018218533A1 PCT/CN2017/086671 CN2017086671W WO2018218533A1 WO 2018218533 A1 WO2018218533 A1 WO 2018218533A1 CN 2017086671 W CN2017086671 W CN 2017086671W WO 2018218533 A1 WO2018218533 A1 WO 2018218533A1
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WIPO (PCT)
Prior art keywords
aftertreatment system
signal
scr exhaust
exhaust aftertreatment
scr
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PCT/CN2017/086671
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French (fr)
Chinese (zh)
Inventor
姚勇
常雁龙
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深圳市爱夫卡科技股份有限公司
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Priority to PCT/CN2017/086671 priority Critical patent/WO2018218533A1/en
Publication of WO2018218533A1 publication Critical patent/WO2018218533A1/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00Testing of engines
    • G01M15/04Testing internal-combustion engines
    • G01M15/10Testing internal-combustion engines by monitoring exhaust gases or combustion flame
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00Testing of vehicles
    • G01M17/007Wheeled or endless-tracked vehicles
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B23/00Testing or monitoring of control systems or parts thereof
    • G05B23/02Electric testing or monitoring

Definitions

  • the invention relates to the technical field of SRC exhaust gas aftertreatment, in particular to a diagnostic method, a diagnostic device and a computer readable storage medium of an SRC exhaust gas aftertreatment system.
  • SCR Selective Catalytic Reduction
  • the SCR exhaust aftertreatment system is a combination of mechanical, electronic, chemical and fluid sciences.
  • a reducing agent such as ammonia (NH3) is released into the exhaust gas stream of the engine.
  • the ammonia can be stored on the surface of the catalyst. On the coating, the ammonia reacts with the nitrogen oxides in the tail gas stream to form environmentally benign products such as nitrogen and water.
  • embodiments of the present invention provide a diagnostic method, a diagnostic apparatus, and a computer readable storage medium for an SCR exhaust aftertreatment system to accurately determine a fault of an SCR exhaust aftertreatment system.
  • a first aspect of the embodiments of the present invention provides a method for diagnosing an SCR exhaust aftertreatment system, comprising the steps of: receiving a test command; parsing the test command to obtain a test item that needs to be detected; and according to the test item, Sending an excitation signal and a power signal to the signal channel and the power channel of the SCR exhaust aftertreatment system to be tested, respectively, so that the SCR exhaust aftertreatment system responds after receiving the excitation signal and the power signal And returning a response electrical signal; receiving an electrical signal returned by the SCR exhaust aftertreatment system; and analyzing the returned electrical signal by a fuzzy algorithm to determine whether the SCR exhaust aftertreatment system is faulty.
  • the determining, by the fuzzy algorithm, the returned electrical signal to determine whether the SCR exhaust aftertreatment system has a fault includes the following steps: establishing a fault fuzzy set membership function; using the fault fuzzy set membership function to calculate and obtain The probability that the electrical signal characteristic returned by the SCR exhaust aftertreatment system falls within the fault fuzzy set; and comparing the probability with a preset threshold to determine whether the SCR exhaust aftertreatment system is faulty.
  • the method before the step of transmitting the excitation signal and the power signal to the signal channel and the power channel of the SCR exhaust aftertreatment system according to the test item, the method further includes the following steps: after the SCR exhaust according to the test item The signal and/or power channels of the processing system are switched and selected for switching and selecting the excitation and/or power signals sent to the SCR exhaust aftertreatment system.
  • the method further includes the following steps: the signal of the SCR exhaust aftertreatment system to be tested The channel and power channel are initialized.
  • the test command further includes a type of the SCR exhaust aftertreatment system.
  • the method further includes the following steps: after the parsing the test item and the SCR exhaust.
  • the type of processing system transmits an excitation signal and a power signal to the signal channel and the power channel of the particular type of SCR exhaust aftertreatment system to be tested, respectively.
  • a second aspect of the present invention provides a diagnostic apparatus for an SCR exhaust aftertreatment system, comprising: a command receiving module for receiving a test command; and a command parsing module for interpreting the test command to obtain a test item that needs to be detected a signal sending module, configured to send, respectively, an excitation signal and a power signal to the signal channel and the power channel of the SCR exhaust aftertreatment system to be tested according to the test item, so that the SCR exhaust aftertreatment system is at the receiving station Responding to the excitation signal and the power signal, and returning a response electrical signal; an electrical signal receiving module for receiving an electrical signal returned by the SCR exhaust aftertreatment system; and a fault analysis module for passing the blur The algorithm analyzes the returned electrical signal to determine if the SCR exhaust aftertreatment system is faulty.
  • the fault analysis module includes: a membership function establishing sub-module, configured to establish a fault fuzzy set membership function; and a probability calculation sub-module, configured to calculate, by using the fault fuzzy set membership function, the SCR exhaust gas post-processing system to return The probability that the electrical signal characteristic falls within the fault fuzzy set; and the fault determining module is configured to compare the probability with a preset threshold to determine whether the SCR exhaust aftertreatment system has a fault.
  • the diagnostic device of the SCR exhaust aftertreatment system further includes a channel switching module, the channel is sent before the excitation signal and the power signal are sent to the signal channel and the power channel of the SCR exhaust aftertreatment system according to the test item.
  • the switching module is configured to switch and select a signal channel and/or a power channel of the SCR exhaust aftertreatment system according to the test item, for switching and selecting an excitation signal sent to the SCR exhaust aftertreatment system and / or power signal.
  • a third aspect of the invention provides a diagnostic apparatus for a CR tail gas aftertreatment system, comprising a memory, a processor, and a computer program stored in the memory and operable on the processor, the processor executing the The computer program implements the steps of the method of any of the preceding claims.
  • a fourth aspect of the invention provides a computer readable storage medium storing a computer program, the computer program being executed by a processor to implement the steps of the method of any of the preceding claims.
  • the embodiment of the present invention has the beneficial effects that the diagnostic method of the SCR exhaust gas aftertreatment system provided by the present invention sends an excitation signal to the signal channel of the SCR exhaust gas aftertreatment system after receiving and parsing the test command.
  • the fuzzy signal is used to analyze the returned electrical signal, and the fault is not simply determined by the preset threshold, but the fault of the SCR exhaust aftertreatment system can be accurately determined by a single fixed preset threshold, thereby improving the accuracy of the fault test. .
  • FIG. 1 is a flow chart showing a method of diagnosing an SCR exhaust gas aftertreatment system according to a first embodiment of the present invention
  • FIG. 2 is a schematic flow chart of a failure analysis step in the diagnosis method of the SCR exhaust gas aftertreatment system of FIG. 1;
  • FIG. 3 is a flow chart showing a method of diagnosing an SCR exhaust gas aftertreatment system according to a second embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a practical application scenario of a method for diagnosing an SCR exhaust gas aftertreatment system according to various embodiments of the present invention
  • Figure 5 is a schematic illustration of a diagnostic apparatus of an SCR tail gas aftertreatment system in accordance with one embodiment of the present invention
  • FIG. 6 is a schematic diagram of the fault analysis module of FIG. 5;
  • FIG. 7 is a schematic diagram of a diagnostic device of an SCR exhaust aftertreatment system in accordance with one embodiment of the present invention.
  • a diagnostic method 100 for an SCR exhaust aftertreatment system is provided in accordance with an embodiment of the present invention.
  • the diagnostic method includes:
  • Step 101 Receive a test command
  • Step 102 Parse the test command to obtain a test item that needs to be detected
  • Step 103 Send an excitation signal and a power signal to the signal channel and the power channel of the SCR exhaust aftertreatment system to be tested according to the test item, so that the SCR exhaust aftertreatment system receives the excitation signal and The power signal will respond and return a response electrical signal;
  • Step 104 Acquire an electrical signal returned by the SCR exhaust aftertreatment system.
  • Step 105 The returned electrical signal is analyzed by a fuzzy algorithm to determine whether there is a fault in the SCR exhaust aftertreatment system. In addition, when the selected test item is tested, return to the test completion command and wait for the test command until the next test.
  • the diagnostic method 100 of the SCR tail gas aftertreatment system employs a fuzzy algorithm to determine a system failure, instead of performing fault determination by a single preset threshold in the prior art, thereby improving the accuracy of the fault test.
  • the SCR exhaust gas aftertreatment system is generally an SCR post-treatment urea pump
  • the SCR post-treatment urea pump generally includes: a motor, an electromagnetic reversing valve, a nozzle solenoid valve, a heating solenoid valve, and an air exchange.
  • a motor an electromagnetic reversing valve
  • a nozzle solenoid valve a heating solenoid valve
  • an air exchange a heating solenoid valve
  • an air exchange to solenoid valve and DCU ((Dosing Control Unit, urea injection control unit, etc.
  • the SCR exhaust aftertreatment system here can also be other devices installed in the car.
  • step S105 is to analyze the returned electrical signal by a fuzzy algorithm to determine whether the SCR exhaust aftertreatment system is A fault includes the following steps:
  • Step 151 Establish a fault fuzzy set membership function
  • Step 152 Calculate the probability that the electrical signal feature returned by the acquired SCR exhaust aftertreatment system falls within the fault fuzzy set by using the fault fuzzy set membership function;
  • Step 153 Compare the probability with the preset threshold to determine whether there is a fault in the SCR exhaust aftertreatment system. For example, when the probability is greater than the threshold, it is determined that the SCR exhaust aftertreatment system has a fault, and vice versa.
  • the diagnostic method 100 of the SCR exhaust aftertreatment system determines the failure of the SCR exhaust aftertreatment system by the above-described fuzzy algorithm, instead of performing fault determination by a single fixed preset threshold in the prior art, thereby enabling Improve the accuracy of fault testing.
  • the diagnostic method 200 of the SCR tail gas aftertreatment system includes the following steps:
  • Step 201 Receive a test command.
  • Step 202 Parse the test command to obtain a test item that needs to be detected, and the test command further includes a type of the SCR exhaust aftertreatment system, so that a specific type of SCR exhaust aftertreatment system can be targeted. Testing to further improve the accuracy of the test;
  • Step 203 Switching and selecting a signal channel and a power channel of the SCR exhaust aftertreatment system for switching and selecting an excitation signal and/or a power signal sent to the SCR exhaust aftertreatment system, thereby being compatible with different types of SCR exhaust aftertreatment system, therefore, for different SCR exhaust aftertreatment systems, you can use a variety of drive circuits to reduce system coupling and hardware costs;
  • Step 204 Initializing the signal channel and the power channel of the SCR exhaust aftertreatment system to be tested, thereby eliminating the influence of the previous test on the signal channel and the power channel of the SCR exhaust aftertreatment system to further improve fault diagnosis Accuracy
  • Step 205 Send an excitation signal and a power signal to the signal channel and the power channel of the specific type of the SCR exhaust gas aftertreatment system to be tested according to the type of the test item and the SCR exhaust aftertreatment system, respectively.
  • the SCR exhaust aftertreatment system responds after receiving the excitation signal and the power signal, and returns a response electrical signal, such as a current and voltage signal returned by the SCR exhaust aftertreatment system;
  • Step 206 Acquire an electrical signal returned by the SCR exhaust aftertreatment system.
  • Step 207 The returned electrical signal is analyzed by a fuzzy algorithm to determine whether there is a fault in the SCR exhaust aftertreatment system. In addition, when the selected test item is tested, return to the test completion command and wait for the test command until the next test.
  • the diagnostic method 200 of the SCR exhaust aftertreatment system determines the failure of the SCR exhaust aftertreatment system by the above-described fuzzy algorithm, instead of performing the failure judgment by a single fixed preset threshold in the prior art. Thereby, the accuracy of the fault test can be improved.
  • step 203 is preferably located.
  • FIG. 4 a schematic structural diagram of a practical application scenario of a diagnosis method of an SCR exhaust gas aftertreatment system according to various embodiments of the present invention, wherein, in practical applications, a diagnosis method using the above SCR exhaust gas aftertreatment system
  • the diagnostic device includes a host computer 1 and a lower computer 2, wherein the host computer 1 is connected to the lower computer 2, and the lower computer 2 is connected to the SCR exhaust gas aftertreatment system 4 through the diagnostic connector 3.
  • the host computer 1 refers to an embedded computer that can directly issue control commands.
  • the lower computer 2 refers to a computer that directly controls the device to acquire the condition of the device.
  • the lower computer 2 includes a host, a serial port interface, a DB26 interface, a driving circuit, and the like.
  • the upper computer 1 is configured to transmit a test command
  • the lower computer 2 receives the test command of the upper computer, and sequentially performs the above steps 101 to 105 or step 201 to step 207, when the test is completed, the lower computer 2 will return the test completion command to the upper computer 1, and wait for the upper computer 1 command until the next test.
  • a diagnostic apparatus 50 for an SCR exhaust aftertreatment system includes:
  • the command receiving module 51 is configured to receive a test command.
  • a command parsing module 52 configured to interpret the obtained test command to obtain a test item that needs to be detected
  • the signal sending module 53 is configured to respectively send an excitation signal and a power signal to the signal channel and the power channel of the SCR exhaust aftertreatment system to be tested according to the test item, so that the SCR exhaust aftertreatment system receives the The excitation signal and the power signal will respond and return a response electrical signal;
  • An electrical signal acquisition module 54 for obtaining an electrical signal returned by the SCR exhaust aftertreatment system
  • the fault analysis module 55 is configured to analyze the returned electrical signal by using a fuzzy algorithm to determine whether the SCR exhaust aftertreatment system has a fault. In addition, when the selected test item is tested, return to the test completion command and wait for the test command until the next test.
  • the diagnostic device of the SCR exhaust gas aftertreatment system uses a fuzzy algorithm to determine a system failure, instead of using a single preset threshold for fault diagnosis in the prior art, thereby being able to adapt to different types of SCR exhaust aftertreatment systems, and further Can improve the accuracy of fault testing.
  • the failure analysis module 55 includes:
  • a probability calculation sub-module 552 configured to calculate, by using the fault fuzzy set membership function, a probability that an electrical signal feature returned by the acquired SCR exhaust after-treatment system falls within the fault fuzzy set;
  • the fault determination sub-module 153 is configured to compare the probability with the threshold to determine whether the SCR exhaust after-treatment system has a fault. For example, when the probability is greater than the threshold, it is determined that the SCR exhaust after-treatment system has a fault, and vice versa.
  • the diagnostic apparatus of the SCR exhaust gas after-treatment system determines the fault of the SCR exhaust gas after-treatment system by the above-described fuzzy algorithm, instead of performing fault diagnosis by a preset threshold in the prior art, thereby being able to adapt to different types.
  • the SCR exhaust aftertreatment system can improve the accuracy of fault testing.
  • the diagnostic apparatus of the SCR exhaust aftertreatment system further includes a channel switching module (not shown) that, in accordance with the test item, signal channels and power channels to the SCR exhaust aftertreatment system Before transmitting the excitation signal and the power signal, the channel switching module is configured to switch and select a signal channel and/or a power channel of the SCR exhaust aftertreatment system according to the test item, for switching and selecting to send to
  • the excitation signal and/or power signal of the SCR exhaust aftertreatment system can be compatible with various SCR exhaust aftertreatment systems, and various drive circuits can be multiplexed for different SCR exhaust aftertreatment systems to reduce system coupling and Hardware cost.
  • the channel switching module transmits a channel switching signal to the multiplexer, thereby switching and selecting the excitation signal and/or the power signal through the multiplexer.
  • the diagnostic apparatus of the SCR exhaust aftertreatment system of the embodiment of the present invention may further include a channel initialization module (not shown) for processing the system to the SCR exhaust gas according to the test item.
  • the channel initialization module is configured to initialize the signal channel and the power channel of the SCR exhaust aftertreatment system to be tested, and the channel initialization module is used for testing
  • the signal path and power output channel of the SCR exhaust aftertreatment system are initialized, which can eliminate the influence of previous tests on the signal channel and power channel of the SCR exhaust aftertreatment system to further improve the accuracy of fault diagnosis.
  • the test command further includes the type of the SCR exhaust aftertreatment system
  • the signal transmitting module parses the acquired After the test command, according to the parsed test item and the type of the SCR exhaust aftertreatment system, the excitation signal and the power supply are respectively sent to the signal channel and the power channel of the specific type of the SCR exhaust aftertreatment system to be tested. Signals to perform targeted tests on specific types of SCR exhaust aftertreatment systems to further improve detection accuracy.
  • FIG. 7 is a schematic illustration of a diagnostic device 70 of an SCR exhaust aftertreatment system in accordance with one embodiment of the present invention.
  • the diagnostic apparatus of the SCR exhaust aftertreatment system of this embodiment includes a processor 71, a memory 72, and a computer program 73 stored in the memory 72 and operable on the processor 71.
  • the processor 71 implements the functions of the modules in the respective device embodiments, such as the functions of the modules 51 to 55 shown in FIG. 5, when the computer program 73 is executed.
  • the computer program 73 can be partitioned into one or more modules that are stored in the memory 72 and executed by the processor 71 to complete the present invention.
  • the one or more modules may be a series of computer program instructions that are capable of performing a particular function, the instruction segments being used to describe the execution of the computer program 73 in a diagnostic device of the SCR exhaust aftertreatment system.
  • the computer program 73 may be divided into a command receiving module, a command parsing module, an excitation signal sending module, an electrical signal acquiring module, and a fault analysis module.
  • the specific functions of each module may refer to the above content, and thus are not described herein.
  • the diagnostic device of the SCR exhaust aftertreatment system may be a computing device such as a desktop computer, a notebook, a palmtop computer, and a cloud server.
  • the diagnostic device of the SCR exhaust aftertreatment system may include, but is not limited to, processor 71, memory 72. It will be understood by those skilled in the art that FIG. 7 is merely an example of a diagnostic device of the SCR exhaust aftertreatment system and does not constitute a limitation to the diagnostic device of the SCR exhaust aftertreatment system, and may include more or fewer components than those illustrated. Alternatively, some components may be combined, or different components, such as the diagnostic device of the SCR exhaust aftertreatment system, may also include input and output devices, network access devices, buses, and the like.
  • the so-called processor 71 can be a central processing unit (Central Processing Unit, CPU), can also be other general-purpose processors, digital signal processors (DSP), ASICs (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate array (Field-Programmable) Gate Array, FPGA) Or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and the like.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the memory 72 may be an internal storage unit of the diagnostic device 70 of the SCR exhaust aftertreatment system, such as a hard disk or memory of the diagnostic device 70 of the SCR exhaust aftertreatment system.
  • the memory 72 may also be an external storage device of the diagnostic device 70 of the SCR exhaust aftertreatment system, such as a plug-in hard disk equipped with the diagnostic device 70 of the SCR exhaust aftertreatment system, and a smart memory card (Smart Media Card, SMC), Secure Digital (SD) card, flash card (Flash) Card) and so on.
  • the memory 72 may also include an internal storage unit of the diagnostic device 70 of the SCR exhaust aftertreatment system and an external storage device.
  • the memory 72 is used to store the computer program and other programs and data required by the diagnostic device 70 of the SCR exhaust aftertreatment system.
  • the memory 72 can also be used to temporarily store data that has been or will be output.
  • each functional unit and module described above is exemplified. In practical applications, the above functions may be assigned to different functional units as needed.
  • the module is completed by dividing the internal structure of the device into different functional units or modules to perform all or part of the functions described above.
  • Each functional unit and module in the embodiment may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit, and the integrated unit may be hardware.
  • Formal implementation can also be implemented in the form of software functional units.
  • the specific names of the respective functional units and modules are only for the purpose of facilitating mutual differentiation, and are not intended to limit the scope of protection of the present application.
  • For the specific working process of the unit and the module in the foregoing system reference may be made to the corresponding process in the foregoing method embodiment, and details are not described herein again.
  • the disclosed apparatus/terminal device and method may be implemented in other manners.
  • the device/terminal device embodiments described above are merely illustrative.
  • the division of the modules or units is only a logical function division.
  • there may be another division manner for example, multiple units.
  • components may be combined or integrated into another system, or some features may be omitted or not performed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated modules/units if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, the present invention implements all or part of the processes in the foregoing embodiments, and may also be completed by a computer program to instruct related hardware.
  • the computer program may be stored in a computer readable storage medium. The steps of the various method embodiments described above may be implemented when the program is executed by the processor. .
  • the computer program comprises computer program code, which may be in the form of source code, object code form, executable file or some intermediate form.
  • the computer readable medium can include any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a removable hard drive, a magnetic disk, an optical disk, a computer memory, a read only memory (ROM, Read-Only) Memory), random access memory (RAM, Random Access Memory), electrical carrier signals, telecommunications signals, and software distribution media.
  • ROM Read Only memory
  • RAM Random Access Memory

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  • General Physics & Mathematics (AREA)
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Abstract

A diagnostic method and a diagnostic device of an SRC exhaust gas aftertreatment system. The diagnostic method comprises the following steps: receiving a test command; parsing the acquired test command; sending, according to a test item, an excitation signal and a power signal respectively to a signal channel and a power supply channel of the exhaust gas aftertreatment system to be tested, so that the SCR exhaust gas aftertreatment system can respond after having received the excitation signal and the power signal and returns a responsive electrical signal; receiving the electrical signal returned by the SCR exhaust gas aftertreatment system; and analyzing the returned electrical signal by means of the fuzzy algorithm, thereby determining whether the SCR exhaust gas aftertreatment system fails. The diagnosis method for the SRC exhaust gas aftertreatment system can accurately determine a fault of the SCR exhaust gas aftertreatment system and provide a fault solution.

Description

SRC尾气后处理系统的诊断方法及诊断装置  Diagnostic method and diagnostic device for SRC exhaust gas aftertreatment system 技术领域Technical field
本发明涉及SRC尾气后处理技术领域,尤其涉及一种SRC尾气后处理系统的诊断方法、诊断装置及计算机可读存储介质。The invention relates to the technical field of SRC exhaust gas aftertreatment, in particular to a diagnostic method, a diagnostic device and a computer readable storage medium of an SRC exhaust gas aftertreatment system.
背景技术Background technique
现有技术中,发动机制造商为了满足关于尾气排放的规定所采用的一种方法是选择性催化还原(Selective Catalytic Reduction,SCR)催化剂来净化发动机尾气流中的氮氧化物。SCR尾气后处理系统是集机械、电子、化学及流体等学科相结合的系统,其在有催化剂的情况下,向发动机尾气流中释放氨(NH3)等还原剂,氨可以存储在催化剂的表面涂层上,在该处氨与尾气流中的氮氧化物反应生成对环境无害的产物,例如氮气和水等。In the prior art, one method used by engine manufacturers to meet the regulations on exhaust emissions is selective catalytic reduction (Selective Catalytic Reduction, SCR) Catalyst to purify nitrogen oxides in the engine's tail gas stream. The SCR exhaust aftertreatment system is a combination of mechanical, electronic, chemical and fluid sciences. In the presence of a catalyst, a reducing agent such as ammonia (NH3) is released into the exhaust gas stream of the engine. The ammonia can be stored on the surface of the catalyst. On the coating, the ammonia reacts with the nitrogen oxides in the tail gas stream to form environmentally benign products such as nitrogen and water.
在SCR尾气后处理系统系统发生故障例如尿素喷射系统堵塞,尿素发挥逃逸等故障时,现有的诊断装置难以准确判定故障,从而无法为维修提供指导。When the SCR exhaust gas after-treatment system system malfunctions, such as the urea injection system is blocked, and the urea exerts a malfunction such as escape, it is difficult for the existing diagnostic device to accurately determine the failure, thereby failing to provide guidance for maintenance.
技术问题technical problem
有鉴于此,本发明实施例提供了一种SCR尾气后处理系统的诊断方法、诊断装置以及计算机可读存储介质,以准确地判断SCR尾气后处理系统的故障。In view of this, embodiments of the present invention provide a diagnostic method, a diagnostic apparatus, and a computer readable storage medium for an SCR exhaust aftertreatment system to accurately determine a fault of an SCR exhaust aftertreatment system.
技术解决方案Technical solution
本发明实施例的第一方面提供了一种SCR尾气后处理系统的诊断方法,包括以下步骤:接收测试命令;解析所述测试命令,以获取需要进行检测的测试项目;根据所述测试项目,向待测试的所述SCR尾气后处理系统的信号通道和电源通道分别发送激励信号和电源信号,以使所述SCR尾气后处理系统在接收所述激励信号和所述电源信号后会做出响应,并返回响应的电气信号;接收所述SCR尾气后处理系统返回的电气信号;和通过模糊算法对返回的所述电气信号进行分析,从而判定所述SCR尾气后处理系统是否存在故障。A first aspect of the embodiments of the present invention provides a method for diagnosing an SCR exhaust aftertreatment system, comprising the steps of: receiving a test command; parsing the test command to obtain a test item that needs to be detected; and according to the test item, Sending an excitation signal and a power signal to the signal channel and the power channel of the SCR exhaust aftertreatment system to be tested, respectively, so that the SCR exhaust aftertreatment system responds after receiving the excitation signal and the power signal And returning a response electrical signal; receiving an electrical signal returned by the SCR exhaust aftertreatment system; and analyzing the returned electrical signal by a fuzzy algorithm to determine whether the SCR exhaust aftertreatment system is faulty.
其中,所述通过模糊算法对返回的所述电气信号进行分析,从而判定所述SCR尾气后处理系统是否存在故障包括以下步骤:建立故障模糊集隶属函数;利用所述故障模糊集隶属函数计算获取的所述SCR尾气后处理系统返回的电气信号特征落在所述故障模糊集内的概率;和将所述概率与预设阈值进行比较,判断所述SCR尾气后处理系统是否存在故障。The determining, by the fuzzy algorithm, the returned electrical signal to determine whether the SCR exhaust aftertreatment system has a fault includes the following steps: establishing a fault fuzzy set membership function; using the fault fuzzy set membership function to calculate and obtain The probability that the electrical signal characteristic returned by the SCR exhaust aftertreatment system falls within the fault fuzzy set; and comparing the probability with a preset threshold to determine whether the SCR exhaust aftertreatment system is faulty.
其中,在根据所述测试项目,向所述SCR尾气后处理系统的信号通道和电源通道发送激励信号和电源信号的步骤之前,还包括以下步骤:根据所述测试项目,对所述SCR尾气后处理系统的信号通道和/或电源通道进行切换和选择,以用于切换和选择发送至所述SCR尾气后处理系统的激励信号和/或电源信号。Wherein, before the step of transmitting the excitation signal and the power signal to the signal channel and the power channel of the SCR exhaust aftertreatment system according to the test item, the method further includes the following steps: after the SCR exhaust according to the test item The signal and/or power channels of the processing system are switched and selected for switching and selecting the excitation and/or power signals sent to the SCR exhaust aftertreatment system.
其中,在根据所述测试项目,向所述SCR尾气后处理系统的信号通道和电源通道发送激励信号和电源信号的步骤之前,还包括以下步骤:对待测试的所述SCR尾气后处理系统的信号通道和电源通道进行初始化设置。Wherein, before the step of transmitting the excitation signal and the power signal to the signal channel and the power channel of the SCR exhaust aftertreatment system according to the test item, the method further includes the following steps: the signal of the SCR exhaust aftertreatment system to be tested The channel and power channel are initialized.
其中,所述测试命令还包括所述SCR尾气后处理系统的类型,在解析获取的所述测试命令的步骤之后,还包括以下步骤:根据解析得来的所述测试项目和所述SCR尾气后处理系统的类型,向待测试的特定类型的所述SCR尾气后处理系统的信号通道和电源通道分别发送激励信号和电源信号。The test command further includes a type of the SCR exhaust aftertreatment system. After the step of parsing the obtained test command, the method further includes the following steps: after the parsing the test item and the SCR exhaust The type of processing system transmits an excitation signal and a power signal to the signal channel and the power channel of the particular type of SCR exhaust aftertreatment system to be tested, respectively.
本发明的第二方面提供一种SCR尾气后处理系统的诊断装置,包括:命令接收模块,用于接收测试命令;命令解析模块,用于解释所述测试命令,以获取需要进行检测的测试项目;信号发送模块,用于根据所述测试项目,向待测试的所述SCR尾气后处理系统的信号通道和电源通道分别发送激励信号和电源信号,以使所述SCR尾气后处理系统在接收所述激励信号和所述电源信号后会做出响应,并返回响应的电气信号;电气信号接收模块,用于接收所述SCR尾气后处理系统返回的电气信号;和故障分析模块,用于通过模糊算法对返回的所述电气信号进行分析,从而判定所述SCR尾气后处理系统是否存在故障。A second aspect of the present invention provides a diagnostic apparatus for an SCR exhaust aftertreatment system, comprising: a command receiving module for receiving a test command; and a command parsing module for interpreting the test command to obtain a test item that needs to be detected a signal sending module, configured to send, respectively, an excitation signal and a power signal to the signal channel and the power channel of the SCR exhaust aftertreatment system to be tested according to the test item, so that the SCR exhaust aftertreatment system is at the receiving station Responding to the excitation signal and the power signal, and returning a response electrical signal; an electrical signal receiving module for receiving an electrical signal returned by the SCR exhaust aftertreatment system; and a fault analysis module for passing the blur The algorithm analyzes the returned electrical signal to determine if the SCR exhaust aftertreatment system is faulty.
其中,所述故障分析模块包括:隶属函数建立子模块,用于建立故障模糊集隶属函数;概率计算子模块,用于利用所述故障模糊集隶属函数计算获取的所述SCR尾气后处理系统返回的电气信号特征落在所述故障模糊集内的概率;和故障判定模块,用于将所述概率与预设阈值进行比较,判断所述SCR尾气后处理系统是否存在故障。The fault analysis module includes: a membership function establishing sub-module, configured to establish a fault fuzzy set membership function; and a probability calculation sub-module, configured to calculate, by using the fault fuzzy set membership function, the SCR exhaust gas post-processing system to return The probability that the electrical signal characteristic falls within the fault fuzzy set; and the fault determining module is configured to compare the probability with a preset threshold to determine whether the SCR exhaust aftertreatment system has a fault.
其中,所述SCR尾气后处理系统的诊断装置还包括通道切换模块,在根据所述测试项目,向所述SCR尾气后处理系统的信号通道和电源通道发送激励信号和电源信号之前,所述通道切换模块用于根据所述测试项目,对所述SCR尾气后处理系统的信号通道和/或电源通道进行切换和选择,以用于切换和选择发送至所述SCR尾气后处理系统的激励信号和/或电源信号。The diagnostic device of the SCR exhaust aftertreatment system further includes a channel switching module, the channel is sent before the excitation signal and the power signal are sent to the signal channel and the power channel of the SCR exhaust aftertreatment system according to the test item. The switching module is configured to switch and select a signal channel and/or a power channel of the SCR exhaust aftertreatment system according to the test item, for switching and selecting an excitation signal sent to the SCR exhaust aftertreatment system and / or power signal.
本发明的第三方面提供一种CR尾气后处理系统的诊断装置,包括存储器、处理器以及存储在所述存储器中并可在所述处理器上运行的计算机程序,所述处理器执行所述计算机程序时实现前述权利要求任一项所述方法的步骤。A third aspect of the invention provides a diagnostic apparatus for a CR tail gas aftertreatment system, comprising a memory, a processor, and a computer program stored in the memory and operable on the processor, the processor executing the The computer program implements the steps of the method of any of the preceding claims.
本发明的第四方面提供一种计算机可读存储介质,所述计算机可读存储介质存储有计算机程序,所述计算机程序被处理器执行时实现前述权利要求任一项所述方法的步骤。A fourth aspect of the invention provides a computer readable storage medium storing a computer program, the computer program being executed by a processor to implement the steps of the method of any of the preceding claims.
有益效果Beneficial effect
本发明实施例与现有技术相比存在的有益效果是:本发明提供的SCR尾气后处理系统的诊断方法中,在接收并解析测试命令后,向SCR尾气后处理系统的信号通道发送激励信号,通过模糊算法对返回的电气信号进行分析,非简单通过预设阈值来判定故障,而通过单一固定预设阈值从而能够准确地判断SCR尾气后处理系统的故障,进而能够提高故障测试的准确率。Compared with the prior art, the embodiment of the present invention has the beneficial effects that the diagnostic method of the SCR exhaust gas aftertreatment system provided by the present invention sends an excitation signal to the signal channel of the SCR exhaust gas aftertreatment system after receiving and parsing the test command. The fuzzy signal is used to analyze the returned electrical signal, and the fault is not simply determined by the preset threshold, but the fault of the SCR exhaust aftertreatment system can be accurately determined by a single fixed preset threshold, thereby improving the accuracy of the fault test. .
附图说明DRAWINGS
为了更清楚地说明本发明实施例中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动性的前提下,还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments or the description of the prior art will be briefly described below. It is obvious that the drawings in the following description are only the present invention. For some embodiments, other drawings may be obtained from those of ordinary skill in the art in light of the inventive workability.
图1是根据本发明的第一实施例的SCR尾气后处理系统的诊断方法的流程示意图;1 is a flow chart showing a method of diagnosing an SCR exhaust gas aftertreatment system according to a first embodiment of the present invention;
图2是图1的SCR尾气后处理系统的诊断方法中的故障分析步骤的流程示意图;2 is a schematic flow chart of a failure analysis step in the diagnosis method of the SCR exhaust gas aftertreatment system of FIG. 1;
图3是根据本发明的第二实施例的SCR尾气后处理系统的诊断方法的流程示意图;3 is a flow chart showing a method of diagnosing an SCR exhaust gas aftertreatment system according to a second embodiment of the present invention;
图4是根据本发明的各实施例的SCR尾气后处理系统的诊断方法的实际应用场景的结构示意图;4 is a schematic structural diagram of a practical application scenario of a method for diagnosing an SCR exhaust gas aftertreatment system according to various embodiments of the present invention;
图5是根据本发明的一个实施例的SCR尾气后处理系统的诊断装置的示意图;Figure 5 is a schematic illustration of a diagnostic apparatus of an SCR tail gas aftertreatment system in accordance with one embodiment of the present invention;
图6是图5的故障分析模块的示意图;6 is a schematic diagram of the fault analysis module of FIG. 5;
图7是根据本发明的一个实施例的SCR尾气后处理系统的诊断装置的示意图。7 is a schematic diagram of a diagnostic device of an SCR exhaust aftertreatment system in accordance with one embodiment of the present invention.
本发明的实施方式Embodiments of the invention
以下描述中,为了说明而不是为了限定,提出了诸如特定系统结构、技术之类的具体细节,以便透彻理解本发明实施例。然而,本领域的技术人员应当清楚,在没有这些具体细节的其它实施例中也可以实现本发明。在其它情况中,省略对众所周知的系统、装置、电路以及方法的详细说明,以免不必要的细节妨碍本发明的描述。In the following description, for purposes of illustration and description However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the invention.
为了说明本发明所述的技术方案,下面通过具体实施例来进行说明。In order to explain the technical solution described in the present invention, the following description will be made by way of specific embodiments.
请参阅图1,示出根据本发明的实施例提供的SCR尾气后处理系统的诊断方法100,该诊断方法包括:Referring to FIG. 1, a diagnostic method 100 for an SCR exhaust aftertreatment system is provided in accordance with an embodiment of the present invention. The diagnostic method includes:
步骤101:接收测试命令;Step 101: Receive a test command;
步骤102:解析所述测试命令,以获取需要进行检测的测试项目;Step 102: Parse the test command to obtain a test item that needs to be detected;
步骤103:根据所述测试项目,向待测试的所述SCR尾气后处理系统的信号通道和电源通道分别发送激励信号和电源信号,以使所述SCR尾气后处理系统在接收所述激励信号和所述电源信号后会做出响应,并返回响应的电气信号;Step 103: Send an excitation signal and a power signal to the signal channel and the power channel of the SCR exhaust aftertreatment system to be tested according to the test item, so that the SCR exhaust aftertreatment system receives the excitation signal and The power signal will respond and return a response electrical signal;
步骤104:获取SCR尾气后处理系统返回的电气信号;和Step 104: Acquire an electrical signal returned by the SCR exhaust aftertreatment system; and
步骤105:通过模糊算法对返回的电气信号进行分析,从而判定SCR尾气后处理系统是否存在故障。此外,当所选择的测试项目测试完成后,返回测试完成命令,并等待测试命令,直到下一项测试。Step 105: The returned electrical signal is analyzed by a fuzzy algorithm to determine whether there is a fault in the SCR exhaust aftertreatment system. In addition, when the selected test item is tested, return to the test completion command and wait for the test command until the next test.
根据本发明的SCR尾气后处理系统的诊断方法100采用模糊算法来确定系统故障,而非现有技术中的通过单一预设阈值来进行故障判断,从而能够提高故障测试的准确率。The diagnostic method 100 of the SCR tail gas aftertreatment system according to the present invention employs a fuzzy algorithm to determine a system failure, instead of performing fault determination by a single preset threshold in the prior art, thereby improving the accuracy of the fault test.
需要说明,根据本发明的实施例的SCR尾气后处理系统通常是SCR后处理尿素泵,该SCR后处理尿素泵一般会包括:电机、电磁换向阀、喷嘴电磁阀、加热电磁阀、空气换向电磁阀和DCU((Dosing Control Unit,尿素喷射控制单元)等。当然,这里的SCR尾气后处理系统也可以是设置在汽车内的其他装置。It should be noted that the SCR exhaust gas aftertreatment system according to an embodiment of the present invention is generally an SCR post-treatment urea pump, and the SCR post-treatment urea pump generally includes: a motor, an electromagnetic reversing valve, a nozzle solenoid valve, a heating solenoid valve, and an air exchange. To solenoid valve and DCU ((Dosing Control Unit, urea injection control unit, etc. Of course, the SCR exhaust aftertreatment system here can also be other devices installed in the car.
请参阅图2,具体地,在根据本发明的实施例的SCR尾气后处理系统的诊断方法100中,步骤S105,即通过模糊算法对返回的电气信号进行分析,从而判定SCR尾气后处理系统是否存在故障包括以下步骤:Referring to FIG. 2, in particular, in the diagnostic method 100 of the SCR exhaust aftertreatment system according to the embodiment of the present invention, step S105 is to analyze the returned electrical signal by a fuzzy algorithm to determine whether the SCR exhaust aftertreatment system is A fault includes the following steps:
步骤151:建立故障模糊集隶属函数;Step 151: Establish a fault fuzzy set membership function;
步骤152:利用故障模糊集隶属函数计算获取的SCR尾气后处理系统返回的电气信号特征落在故障模糊集内的概率;和Step 152: Calculate the probability that the electrical signal feature returned by the acquired SCR exhaust aftertreatment system falls within the fault fuzzy set by using the fault fuzzy set membership function; and
步骤153:将概率与预设阈值进行比较,判断SCR尾气后处理系统是否存在故障,例如当上述概率大于阈值时,则判定SCR尾气后处理系统存在故障,反之亦然。Step 153: Compare the probability with the preset threshold to determine whether there is a fault in the SCR exhaust aftertreatment system. For example, when the probability is greater than the threshold, it is determined that the SCR exhaust aftertreatment system has a fault, and vice versa.
根据本发明的实施例的SCR尾气后处理系统的诊断方法100通过上述模糊算法来判定SCR尾气后处理系统的故障,而非现有技术中的通过单一固定预设阈值来进行故障判断,从而能够提高故障测试的准确率。The diagnostic method 100 of the SCR exhaust aftertreatment system according to the embodiment of the present invention determines the failure of the SCR exhaust aftertreatment system by the above-described fuzzy algorithm, instead of performing fault determination by a single fixed preset threshold in the prior art, thereby enabling Improve the accuracy of fault testing.
以下,请参阅图3,说明本发明的第二实施例所涉及的SCR尾气后处理系统的诊断方法200。该SCR尾气后处理系统的诊断方法200包括以下步骤:Hereinafter, a diagnosis method 200 of the SCR exhaust gas aftertreatment system according to the second embodiment of the present invention will be described with reference to FIG. 3. The diagnostic method 200 of the SCR tail gas aftertreatment system includes the following steps:
步骤201:接收测试命令;Step 201: Receive a test command.
步骤202:解析所述测试命令,以获取需要进行检测的测试项目,所述测试命令还包括所述SCR尾气后处理系统的类型,从而能够对特定类型的SCR尾气后处理系统进行有针对性的测试,从而能够进一步提高检测的准确性;Step 202: Parse the test command to obtain a test item that needs to be detected, and the test command further includes a type of the SCR exhaust aftertreatment system, so that a specific type of SCR exhaust aftertreatment system can be targeted. Testing to further improve the accuracy of the test;
步骤203:对SCR尾气后处理系统的信号通道和电源通道进行切换和选择,以用于切换和选择发送至所述SCR尾气后处理系统的激励信号和/或电源信号,从而能够兼容不同种类的SCR尾气后处理系统,因此,针对不同的SCR尾气后处理系统,可以利用各种驱动电路,减少系统耦合和硬件成本;Step 203: Switching and selecting a signal channel and a power channel of the SCR exhaust aftertreatment system for switching and selecting an excitation signal and/or a power signal sent to the SCR exhaust aftertreatment system, thereby being compatible with different types of SCR exhaust aftertreatment system, therefore, for different SCR exhaust aftertreatment systems, you can use a variety of drive circuits to reduce system coupling and hardware costs;
步骤204:对待测试的所述SCR尾气后处理系统的信号通道和电源通道进行初始化设置,从而能够消除之前的测试对SCR尾气后处理系统的信号通道和电源通道造成的影响,以进一步提高故障诊断的准确性;Step 204: Initializing the signal channel and the power channel of the SCR exhaust aftertreatment system to be tested, thereby eliminating the influence of the previous test on the signal channel and the power channel of the SCR exhaust aftertreatment system to further improve fault diagnosis Accuracy
步骤205:根据所述测试项目和所述SCR尾气后处理系统的类型,向待测试的特定类型的所述SCR尾气后处理系统的信号通道和电源通道分别发送激励信号和电源信号,以使所述SCR尾气后处理系统在接收所述激励信号和所述电源信号后会做出响应,并返回响应的电气信号,例如所述SCR尾气后处理系统返回的电流、电压信号;Step 205: Send an excitation signal and a power signal to the signal channel and the power channel of the specific type of the SCR exhaust gas aftertreatment system to be tested according to the type of the test item and the SCR exhaust aftertreatment system, respectively. The SCR exhaust aftertreatment system responds after receiving the excitation signal and the power signal, and returns a response electrical signal, such as a current and voltage signal returned by the SCR exhaust aftertreatment system;
步骤206:获取SCR尾气后处理系统返回的电气信号;和Step 206: Acquire an electrical signal returned by the SCR exhaust aftertreatment system; and
步骤207:通过模糊算法对返回的电气信号进行分析,从而判定SCR尾气后处理系统是否存在故障。此外,当所选择的测试项目测试完成后,返回测试完成命令,并等待测试命令,直到下一项测试。Step 207: The returned electrical signal is analyzed by a fuzzy algorithm to determine whether there is a fault in the SCR exhaust aftertreatment system. In addition, when the selected test item is tested, return to the test completion command and wait for the test command until the next test.
根据本发明的第二实施例的SCR尾气后处理系统的诊断方法200通过上述模糊算法来判定SCR尾气后处理系统的故障,而非现有技术中的通过单一固定预设阈值来进行故障判断,从而能够提高故障测试的准确率。The diagnostic method 200 of the SCR exhaust aftertreatment system according to the second embodiment of the present invention determines the failure of the SCR exhaust aftertreatment system by the above-described fuzzy algorithm, instead of performing the failure judgment by a single fixed preset threshold in the prior art. Thereby, the accuracy of the fault test can be improved.
需要说明,在根据本发明的第二实施例的SCR尾气后处理系统的诊断方法200中,步骤203和步骤204的顺序可以互换,而不影响上述诊断方法的实现,但是,步骤203优选位于步骤204之前。It should be noted that in the diagnostic method 200 of the SCR exhaust aftertreatment system according to the second embodiment of the present invention, the order of steps 203 and 204 may be interchanged without affecting the implementation of the above diagnostic method, but step 203 is preferably located. Before step 204.
在实际应用中,参照图4,根据本发明的各实施例的SCR尾气后处理系统的诊断方法的实际应用场景的结构示意图,其中,在实际应用中,利用上述SCR尾气后处理系统的诊断方法的诊断装置包括上位机1和下位机2,其中上位机1与下位机2相连,下位机2通过诊断接头3与SCR尾气后处理系统4相连。上位机1是指可以直接发出操控命令的嵌入式计算机。下位机2则是指直接控制设备获取设备状况的计算机,在根据本发明的实施例的SCR尾气后处理系统的诊断方法中,下位机2包括主机、串口接口、DB26接口和驱动电路等。例如在上述根据本发明的各实施例的SCR尾气后处理系统的诊断方法中,上位机1用于发送测试命令,下位机2则会接收上位机的测试命令,并依次执行上述步骤101至步骤105或者步骤201至步骤207,当测试完成后,下位机2会将测试完成命令返回至上位机1,并且等待上位机1命令,直到下一项测试。In practical applications, referring to FIG. 4, a schematic structural diagram of a practical application scenario of a diagnosis method of an SCR exhaust gas aftertreatment system according to various embodiments of the present invention, wherein, in practical applications, a diagnosis method using the above SCR exhaust gas aftertreatment system The diagnostic device includes a host computer 1 and a lower computer 2, wherein the host computer 1 is connected to the lower computer 2, and the lower computer 2 is connected to the SCR exhaust gas aftertreatment system 4 through the diagnostic connector 3. The host computer 1 refers to an embedded computer that can directly issue control commands. The lower computer 2 refers to a computer that directly controls the device to acquire the condition of the device. In the diagnostic method of the SCR exhaust gas aftertreatment system according to the embodiment of the present invention, the lower computer 2 includes a host, a serial port interface, a DB26 interface, a driving circuit, and the like. For example, in the above-described diagnostic method of the SCR exhaust gas aftertreatment system according to various embodiments of the present invention, the upper computer 1 is configured to transmit a test command, and the lower computer 2 receives the test command of the upper computer, and sequentially performs the above steps 101 to 105 or step 201 to step 207, when the test is completed, the lower computer 2 will return the test completion command to the upper computer 1, and wait for the upper computer 1 command until the next test.
请参阅图5,本发明的一个实施例的SCR尾气后处理系统的诊断装置50包括:Referring to FIG. 5, a diagnostic apparatus 50 for an SCR exhaust aftertreatment system according to an embodiment of the present invention includes:
命令接收模块51,用于接收测试命令;The command receiving module 51 is configured to receive a test command.
命令解析模块52,用于解释获取的测试命令,以获取需要进行检测的测试项目;a command parsing module 52, configured to interpret the obtained test command to obtain a test item that needs to be detected;
信号发送模块53,用于根据上述测试项目,向待测试的所述SCR尾气后处理系统的信号通道和电源通道分别发送激励信号和电源信号,以使所述SCR尾气后处理系统在接收所述激励信号和所述电源信号后会做出响应,并返回响应的电气信号;The signal sending module 53 is configured to respectively send an excitation signal and a power signal to the signal channel and the power channel of the SCR exhaust aftertreatment system to be tested according to the test item, so that the SCR exhaust aftertreatment system receives the The excitation signal and the power signal will respond and return a response electrical signal;
电气信号获取模块54,用于获取SCR尾气后处理系统返回的电气信号;和An electrical signal acquisition module 54 for obtaining an electrical signal returned by the SCR exhaust aftertreatment system; and
故障分析模块55,用于通过模糊算法对返回的电气信号进行分析,从而判定SCR尾气后处理系统是否存在故障。此外,当所选择的测试项目测试完成后,返回测试完成命令,并等待测试命令,直到下一项测试。The fault analysis module 55 is configured to analyze the returned electrical signal by using a fuzzy algorithm to determine whether the SCR exhaust aftertreatment system has a fault. In addition, when the selected test item is tested, return to the test completion command and wait for the test command until the next test.
根据本发明的SCR尾气后处理系统的诊断装置采用模糊算法来确定系统故障,而非现有技术中的通过单一预设阈值来进行故障判断,从而能够适应不同类型的SCR尾气后处理系统,进而能够提高故障测试的准确率。The diagnostic device of the SCR exhaust gas aftertreatment system according to the present invention uses a fuzzy algorithm to determine a system failure, instead of using a single preset threshold for fault diagnosis in the prior art, thereby being able to adapt to different types of SCR exhaust aftertreatment systems, and further Can improve the accuracy of fault testing.
请参阅图6,具体地,在根据本发明的实施例的SCR尾气后处理系统的诊断装置中,故障分析模块55包括:Referring to FIG. 6, in particular, in the diagnostic apparatus of the SCR exhaust aftertreatment system according to the embodiment of the present invention, the failure analysis module 55 includes:
隶属函数建立子模块551,用于建立故障模糊集隶属函数;a membership function establishing sub-module 551, configured to establish a fault fuzzy set membership function;
概率计算子模块552,用于利用所述故障模糊集隶属函数计算获取的SCR尾气后处理系统返回的电气信号特征落在故障模糊集内的概率;和a probability calculation sub-module 552, configured to calculate, by using the fault fuzzy set membership function, a probability that an electrical signal feature returned by the acquired SCR exhaust after-treatment system falls within the fault fuzzy set; and
故障判定子模块153,用于将概率与阈值进行比较,判断SCR尾气后处理系统是否存在故障,例如当上述概率大于阈值时,则判定SCR尾气后处理系统存在故障,反之亦然。The fault determination sub-module 153 is configured to compare the probability with the threshold to determine whether the SCR exhaust after-treatment system has a fault. For example, when the probability is greater than the threshold, it is determined that the SCR exhaust after-treatment system has a fault, and vice versa.
根据本发明的实施例的SCR尾气后处理系统的诊断装置通过上述模糊算法来判定SCR尾气后处理系统的故障,而非现有技术中的通过预设阈值来进行故障判断,从而能够适应不同类型的SCR尾气后处理系统,进而能够提高故障测试的准确率。The diagnostic apparatus of the SCR exhaust gas after-treatment system according to the embodiment of the present invention determines the fault of the SCR exhaust gas after-treatment system by the above-described fuzzy algorithm, instead of performing fault diagnosis by a preset threshold in the prior art, thereby being able to adapt to different types. The SCR exhaust aftertreatment system can improve the accuracy of fault testing.
进一步地,根据本发明的实施例的SCR尾气后处理系统的诊断装置还包括通道切换模块(未示出),在根据所述测试项目,向所述SCR尾气后处理系统的信号通道和电源通道发送激励信号和电源信号之前,所述通道切换模块用于根据所述测试项目,对所述SCR尾气后处理系统的信号通道和/或电源通道进行切换和选择,以用于切换和选择发送至所述SCR尾气后处理系统的激励信号和/或电源信号,从而能够兼容多种SCR尾气后处理系统,并且针对不同的SCR尾气后处理系统,可以复用各种驱动电路,减小系统耦合和硬件成本。在实际应用中,通道切换模块会将通道切换信号传送至多路开关,从而通过该多路开关来实现激励信号和/或电源信号的切换和选择。Further, the diagnostic apparatus of the SCR exhaust aftertreatment system according to an embodiment of the present invention further includes a channel switching module (not shown) that, in accordance with the test item, signal channels and power channels to the SCR exhaust aftertreatment system Before transmitting the excitation signal and the power signal, the channel switching module is configured to switch and select a signal channel and/or a power channel of the SCR exhaust aftertreatment system according to the test item, for switching and selecting to send to The excitation signal and/or power signal of the SCR exhaust aftertreatment system can be compatible with various SCR exhaust aftertreatment systems, and various drive circuits can be multiplexed for different SCR exhaust aftertreatment systems to reduce system coupling and Hardware cost. In practical applications, the channel switching module transmits a channel switching signal to the multiplexer, thereby switching and selecting the excitation signal and/or the power signal through the multiplexer.
当然,根据本发明的实施例的本发明的实施例的SCR尾气后处理系统的诊断装置还可以包括通道初始化模块(未示出),在根据所述测试项目,向所述SCR尾气后处理系统的信号通道和电源通道发送激励信号和电源信号之前,所述通道初始化模块用于对待测试的所述SCR尾气后处理系统的信号通道和电源通道进行初始化设置,该通道初始化模块用于对待测试的SCR尾气后处理系统的信号通道和电源输出通道进行初始化设置,从而能够消除之前的测试对SCR尾气后处理系统的信号通道和电源通道造成的影响,以进一步提高故障诊断的准确性。Of course, the diagnostic apparatus of the SCR exhaust aftertreatment system of the embodiment of the present invention according to an embodiment of the present invention may further include a channel initialization module (not shown) for processing the system to the SCR exhaust gas according to the test item. Before the signal channel and the power channel send the excitation signal and the power signal, the channel initialization module is configured to initialize the signal channel and the power channel of the SCR exhaust aftertreatment system to be tested, and the channel initialization module is used for testing The signal path and power output channel of the SCR exhaust aftertreatment system are initialized, which can eliminate the influence of previous tests on the signal channel and power channel of the SCR exhaust aftertreatment system to further improve the accuracy of fault diagnosis.
此外,根据本发明的实施例的本发明的实施例的SCR尾气后处理系统的诊断装置中,所述测试命令还包括所述SCR尾气后处理系统的类型,信号发送模块在解析获取的所述测试命令之后,根据解析得来的所述测试项目和所述SCR尾气后处理系统的类型,向待测试的特定类型的所述SCR尾气后处理系统的信号通道和电源通道分别发送激励信号和电源信号,以对特定类型的SCR尾气后处理系统进行有针对性的测试,从而能够进一步提高检测的准确性。Further, in the diagnostic apparatus of the SCR exhaust aftertreatment system according to the embodiment of the present invention, the test command further includes the type of the SCR exhaust aftertreatment system, and the signal transmitting module parses the acquired After the test command, according to the parsed test item and the type of the SCR exhaust aftertreatment system, the excitation signal and the power supply are respectively sent to the signal channel and the power channel of the specific type of the SCR exhaust aftertreatment system to be tested. Signals to perform targeted tests on specific types of SCR exhaust aftertreatment systems to further improve detection accuracy.
应理解,上述实施例中各步骤的序号的大小并不意味着执行顺序的先后,各过程的执行顺序应以其功能和内在逻辑确定,而不应对本发明实施例的实施过程构成任何限定。It should be understood that the size of the sequence of the steps in the above embodiments does not imply a sequence of executions, and the order of execution of the processes should be determined by its function and internal logic, and should not be construed as limiting the implementation of the embodiments of the present invention.
图7是根据本发明的一个实施例的SCR尾气后处理系统的诊断装置70的示意图。如图7所示,该实施例的SCR尾气后处理系统的诊断装置包括:处理器71、存储器72以及存储在所述存储器72中并可在所述处理器71上运行的计算机程序73。所述处理器71执行所述计算机程序73时实现上述SCR尾气后处理系统的诊断方法的各个方法实施例中的步骤,例如图1所示的步骤101至105。或者,所述处理器71执行所述计算机程序73时实现上述各装置实施例中各模块的功能,例如图5所示模块51至55的功能。Figure 7 is a schematic illustration of a diagnostic device 70 of an SCR exhaust aftertreatment system in accordance with one embodiment of the present invention. As shown in FIG. 7, the diagnostic apparatus of the SCR exhaust aftertreatment system of this embodiment includes a processor 71, a memory 72, and a computer program 73 stored in the memory 72 and operable on the processor 71. The steps in the various method embodiments of the diagnostic method of the SCR exhaust aftertreatment system described above when the processor 71 executes the computer program 73, such as steps 101 to 105 shown in FIG. Alternatively, the processor 71 implements the functions of the modules in the respective device embodiments, such as the functions of the modules 51 to 55 shown in FIG. 5, when the computer program 73 is executed.
示例性的,所述计算机程序73可以被分割成一个或多个模块,所述一个或者多个模块被存储在所述存储器72中,并由所述处理器71执行,以完成本发明。所述一个或多个模块可以是能够完成特定功能的一系列计算机程序指令段,该指令段用于描述所述计算机程序73在所述SCR尾气后处理系统的诊断装置中的执行过程。例如,所述计算机程序73可以被分割成命令接收模块、命令解析模块、激励信号发送模块、电气信号获取模块以及故障分析模块等,各模块的具体功能可以参考上文的内容,故不赘述。Illustratively, the computer program 73 can be partitioned into one or more modules that are stored in the memory 72 and executed by the processor 71 to complete the present invention. The one or more modules may be a series of computer program instructions that are capable of performing a particular function, the instruction segments being used to describe the execution of the computer program 73 in a diagnostic device of the SCR exhaust aftertreatment system. For example, the computer program 73 may be divided into a command receiving module, a command parsing module, an excitation signal sending module, an electrical signal acquiring module, and a fault analysis module. The specific functions of each module may refer to the above content, and thus are not described herein.
所述SCR尾气后处理系统的诊断装置可以是桌上型计算机、笔记本、掌上电脑及云端服务器等计算设备。所述SCR尾气后处理系统的诊断装置可包括,但不仅限于处理器71、存储器72。本领域技术人员可以理解,图7仅仅是SCR尾气后处理系统的诊断装置的示例,并不构成对SCR尾气后处理系统的诊断装置的限定,可以包括比图示更多或更少的部件,或者组合某些部件,或者不同的部件,例如所述SCR尾气后处理系统的诊断装置还可以包括输入输出设备、网络接入设备、总线等。The diagnostic device of the SCR exhaust aftertreatment system may be a computing device such as a desktop computer, a notebook, a palmtop computer, and a cloud server. The diagnostic device of the SCR exhaust aftertreatment system may include, but is not limited to, processor 71, memory 72. It will be understood by those skilled in the art that FIG. 7 is merely an example of a diagnostic device of the SCR exhaust aftertreatment system and does not constitute a limitation to the diagnostic device of the SCR exhaust aftertreatment system, and may include more or fewer components than those illustrated. Alternatively, some components may be combined, or different components, such as the diagnostic device of the SCR exhaust aftertreatment system, may also include input and output devices, network access devices, buses, and the like.
所称处理器71可以是中央处理单元(Central Processing Unit,CPU),还可以是其他通用处理器、数字信号处理器 (Digital Signal Processor,DSP)、专用集成电路 (Application Specific Integrated Circuit,ASIC)、现成可编程门阵列 (Field-Programmable Gate Array,FPGA) 或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。The so-called processor 71 can be a central processing unit (Central Processing Unit, CPU), can also be other general-purpose processors, digital signal processors (DSP), ASICs (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate array (Field-Programmable) Gate Array, FPGA) Or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and the like. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
所述存储器72可以是所述SCR尾气后处理系统的诊断装置70的内部存储单元,例如SCR尾气后处理系统的诊断装置70的硬盘或内存。所述存储器72也可以是所述SCR尾气后处理系统的诊断装置70的外部存储设备,例如所述SCR尾气后处理系统的诊断装置70上配备的插接式硬盘,智能存储卡(Smart Media Card, SMC),安全数字(Secure Digital, SD)卡,闪存卡(Flash Card)等。进一步地,所述存储器72还可以既包括所述SCR尾气后处理系统的诊断装置70的内部存储单元也包括外部存储设备。所述存储器72用于存储所述计算机程序以及所述SCR尾气后处理系统的诊断装置70所需的其他程序和数据。所述存储器72还可以用于暂时地存储已经输出或者将要输出的数据。The memory 72 may be an internal storage unit of the diagnostic device 70 of the SCR exhaust aftertreatment system, such as a hard disk or memory of the diagnostic device 70 of the SCR exhaust aftertreatment system. The memory 72 may also be an external storage device of the diagnostic device 70 of the SCR exhaust aftertreatment system, such as a plug-in hard disk equipped with the diagnostic device 70 of the SCR exhaust aftertreatment system, and a smart memory card (Smart Media Card, SMC), Secure Digital (SD) card, flash card (Flash) Card) and so on. Further, the memory 72 may also include an internal storage unit of the diagnostic device 70 of the SCR exhaust aftertreatment system and an external storage device. The memory 72 is used to store the computer program and other programs and data required by the diagnostic device 70 of the SCR exhaust aftertreatment system. The memory 72 can also be used to temporarily store data that has been or will be output.
所属领域的技术人员可以清楚地了解到,为了描述的方便和简洁,仅以上述各功能单元、模块的划分进行举例说明,实际应用中,可以根据需要而将上述功能分配由不同的功能单元、模块完成,即将所述装置的内部结构划分成不同的功能单元或模块,以完成以上描述的全部或者部分功能。实施例中的各功能单元、模块可以集成在一个处理单元中,也可以是各个单元单独物理存在,也可以两个或两个以上单元集成在一个单元中,上述集成的单元既可以采用硬件的形式实现,也可以采用软件功能单元的形式实现。另外,各功能单元、模块的具体名称也只是为了便于相互区分,并不用于限制本申请的保护范围。上述系统中单元、模块的具体工作过程,可以参考前述方法实施例中的对应过程,在此不再赘述。It will be apparent to those skilled in the art that, for convenience and brevity of description, only the division of each functional unit and module described above is exemplified. In practical applications, the above functions may be assigned to different functional units as needed. The module is completed by dividing the internal structure of the device into different functional units or modules to perform all or part of the functions described above. Each functional unit and module in the embodiment may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit, and the integrated unit may be hardware. Formal implementation can also be implemented in the form of software functional units. In addition, the specific names of the respective functional units and modules are only for the purpose of facilitating mutual differentiation, and are not intended to limit the scope of protection of the present application. For the specific working process of the unit and the module in the foregoing system, reference may be made to the corresponding process in the foregoing method embodiment, and details are not described herein again.
在上述实施例中,对各个实施例的描述都各有侧重,某个实施例中没有详述或记载的部分,可以参见其它实施例的相关描述。In the above embodiments, the descriptions of the various embodiments are different, and the parts that are not detailed or described in a certain embodiment can be referred to the related descriptions of other embodiments.
本领域普通技术人员可以意识到,结合本文中所公开的实施例描述的各示例的单元及算法步骤,能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行,取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能,但是这种实现不应认为超出本发明的范围。Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.
在本发明所提供的实施例中,应该理解到,所揭露的装置/终端设备和方法,可以通过其它的方式实现。例如,以上所描述的装置/终端设备实施例仅仅是示意性的,例如,所述模块或单元的划分,仅仅为一种逻辑功能划分,实际实现时可以有另外的划分方式,例如多个单元或组件可以结合或者可以集成到另一个系统,或一些特征可以忽略,或不执行。另一点,所显示或讨论的相互之间的耦合或直接耦合或通讯连接可以是通过一些接口,装置或单元的间接耦合或通讯连接,可以是电性,机械或其它的形式。In the embodiments provided by the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other manners. For example, the device/terminal device embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units. Or components may be combined or integrated into another system, or some features may be omitted or not performed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in electrical, mechanical or other form.
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的,作为单元显示的部件可以是或者也可以不是物理单元,即可以位于一个地方,或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
另外,在本发明各个实施例中的各功能单元可以集成在一个处理单元中,也可以是各个单元单独物理存在,也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现,也可以采用软件功能单元的形式实现。In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
所述集成的模块/单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时,可以存储在一个计算机可读取存储介质中。基于这样的理解,本发明实现上述实施例方法中的全部或部分流程,也可以通过计算机程序来指令相关的硬件来完成,所述的计算机程序可存储于一计算机可读存储介质中,该计算机程序在被处理器执行时,可实现上述各个方法实施例的步骤。。其中,所述计算机程序包括计算机程序代码,所述计算机程序代码可以为源代码形式、对象代码形式、可执行文件或某些中间形式等。所述计算机可读介质可以包括:能够携带所述计算机程序代码的任何实体或装置、记录介质、U盘、移动硬盘、磁碟、光盘、计算机存储器、只读存储器(ROM,Read-Only Memory)、随机存取存储器(RAM,Random Access Memory)、电载波信号、电信信号以及软件分发介质等。需要说明的是,所述计算机可读介质包含的内容可以根据司法管辖区内立法和专利实践的要求进行适当的增减,例如在某些司法管辖区,根据立法和专利实践,计算机可读介质不包括电载波信号和电信信号。The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, the present invention implements all or part of the processes in the foregoing embodiments, and may also be completed by a computer program to instruct related hardware. The computer program may be stored in a computer readable storage medium. The steps of the various method embodiments described above may be implemented when the program is executed by the processor. . Wherein, the computer program comprises computer program code, which may be in the form of source code, object code form, executable file or some intermediate form. The computer readable medium can include any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a removable hard drive, a magnetic disk, an optical disk, a computer memory, a read only memory (ROM, Read-Only) Memory), random access memory (RAM, Random Access Memory), electrical carrier signals, telecommunications signals, and software distribution media. It should be noted that the content contained in the computer readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in a jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, computer readable media Does not include electrical carrier signals and telecommunication signals.
以上所述实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围,均应包含在本发明的保护范围之内。The embodiments described above are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that The technical solutions described in the examples are modified, or some of the technical features are equivalently replaced; and the modifications or substitutions do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in Within the scope of protection of the present invention.

Claims (10)

  1. 一种SCR尾气后处理系统的诊断方法,其特征在于,包括以下步骤: A method for diagnosing an SCR tail gas aftertreatment system, comprising the steps of:
    接收测试命令;Receiving test commands;
    解析所述测试命令,以获取需要进行检测的测试项目;Parsing the test command to obtain a test item that needs to be tested;
    根据所述测试项目,向待测试的所述SCR尾气后处理系统的信号通道和电源通道分别发送激励信号和电源信号,以使所述SCR尾气后处理系统在接收所述激励信号和所述电源信号后会做出响应,并返回响应的电气信号;And transmitting, according to the test item, an excitation signal and a power signal to the signal channel and the power channel of the SCR exhaust aftertreatment system to be tested, so that the SCR exhaust aftertreatment system receives the excitation signal and the power source The signal will respond and return the electrical signal of the response;
    接收所述SCR尾气后处理系统返回的电气信号;和Receiving an electrical signal returned by the SCR exhaust aftertreatment system; and
    通过模糊算法对返回的所述电气信号进行分析,从而判定所述SCR尾气后处理系统是否存在故障。The returned electrical signal is analyzed by a fuzzy algorithm to determine if the SCR exhaust aftertreatment system is faulty.
  2. 如权利要求1所述的SCR尾气后处理系统的诊断方法,其特征在于,所述通过模糊算法对返回的所述电气信号进行分析,从而判定所述SCR尾气后处理系统是否存在故障包括以下步骤:The method of diagnosing an SCR exhaust aftertreatment system according to claim 1, wherein said analyzing said returned electrical signal by a fuzzy algorithm to determine whether said SCR exhaust aftertreatment system is faulty comprises the following steps :
    建立故障模糊集隶属函数;Establish a fault fuzzy set membership function;
    利用所述故障模糊集隶属函数计算获取的所述SCR尾气后处理系统返回的电气信号特征落在所述故障模糊集内的概率;和Calculating, by using the fault fuzzy set membership function, a probability that an electrical signal feature returned by the SCR exhaust aftertreatment system falls within the fault fuzzy set; and
    将所述概率与预设阈值进行比较,判断所述SCR尾气后处理系统是否存在故障。Comparing the probability with a preset threshold to determine whether the SCR exhaust aftertreatment system has a fault.
  3. 如权利要求1或2所述的SCR尾气后处理系统的诊断方法,其特征在于,在根据所述测试项目,向所述SCR尾气后处理系统的信号通道和电源通道发送激励信号和电源信号的步骤之前,还包括以下步骤:根据所述测试项目,对所述SCR尾气后处理系统的信号通道和/或电源通道进行切换和选择,以用于切换和选择发送至所述SCR尾气后处理系统的激励信号和/或电源信号。 A method for diagnosing an SCR exhaust gas aftertreatment system according to claim 1 or 2, wherein, in accordance with said test item, an excitation signal and a power supply signal are transmitted to a signal channel and a power supply channel of said SCR exhaust gas aftertreatment system Before the step, the method further includes the following steps: switching and selecting a signal channel and/or a power channel of the SCR exhaust aftertreatment system for switching and selecting for transmission to the SCR exhaust aftertreatment system according to the test item Excitation signal and / or power signal.
  4. 如权利要求1所述的SCR尾气后处理系统的诊断方法,其特征在于,在根据所述测试项目,向所述SCR尾气后处理系统的信号通道和电源通道发送激励信号和电源信号的步骤之前,还包括以下步骤:对待测试的所述SCR尾气后处理系统的信号通道和电源通道进行初始化设置。A method of diagnosing an SCR exhaust aftertreatment system according to claim 1 wherein prior to said step of transmitting an excitation signal and a power signal to said signal path and power path of said SCR tail gas aftertreatment system in accordance with said test item The method further includes the following steps: initializing the signal channel and the power channel of the SCR exhaust aftertreatment system to be tested.
  5. 如权利要求1所述的SCR尾气后处理系统的诊断方法,其特征在于,A method of diagnosing an SCR tail gas aftertreatment system according to claim 1, wherein
    所述测试命令还包括所述SCR尾气后处理系统的类型,在解析获取的所述测试命令的步骤之后,还包括以下步骤:根据解析得来的所述测试项目和所述SCR尾气后处理系统的类型,向待测试的特定类型的所述SCR尾气后处理系统的信号通道和电源通道分别发送激励信号和电源信号。The test command further includes a type of the SCR exhaust aftertreatment system. After the step of parsing the obtained test command, the method further includes the following steps: the parsing the test item and the SCR exhaust aftertreatment system A type that transmits an excitation signal and a power signal to a signal channel and a power channel of the particular type of SCR exhaust aftertreatment system to be tested, respectively.
  6. 一种SCR尾气后处理系统的诊断装置,其特征在于,包括:A diagnostic device for an SCR exhaust gas aftertreatment system, comprising:
    命令接收模块,用于接收测试命令;a command receiving module, configured to receive a test command;
    命令解析模块,用于解释所述测试命令,以获取需要进行检测的测试项目;a command parsing module, configured to interpret the test command to obtain a test item that needs to be tested;
    信号发送模块,用于根据所述测试项目,向待测试的所述SCR尾气后处理系统的信号通道和电源通道分别发送激励信号和电源信号,以使所述SCR尾气后处理系统在接收所述激励信号和所述电源信号后会做出响应,并返回响应的电气信号;a signal sending module, configured to respectively send an excitation signal and a power signal to the signal channel and the power channel of the SCR exhaust aftertreatment system to be tested according to the test item, so that the SCR exhaust aftertreatment system receives the The excitation signal and the power signal will respond and return a response electrical signal;
    电气信号接收模块,用于接收所述SCR尾气后处理系统返回的电气信号;和An electrical signal receiving module for receiving an electrical signal returned by the SCR exhaust aftertreatment system; and
    故障分析模块,用于通过模糊算法对返回的所述电气信号进行分析,从而判定所述SCR尾气后处理系统是否存在故障。The fault analysis module is configured to analyze the returned electrical signal by a fuzzy algorithm to determine whether the SCR exhaust aftertreatment system has a fault.
  7. 如权利要求6所述的SCR尾气后处理系统的诊断装置,其特征在于,所述故障分析模块包括:The diagnostic device of the SCR exhaust aftertreatment system of claim 6, wherein the failure analysis module comprises:
    隶属函数建立子模块,用于建立故障模糊集隶属函数;A membership function sub-module is used to establish a fault fuzzy set membership function;
    概率计算子模块,用于利用所述故障模糊集隶属函数计算获取的所述SCR尾气后处理系统返回的电气信号特征落在所述故障模糊集内的概率;和a probability calculation submodule, configured to calculate, by using the fault fuzzy set membership function, a probability that an electrical signal feature returned by the SCR exhaust aftertreatment system falls within the fault fuzzy set; and
    故障判定子模块,用于将所述概率与预设阈值进行比较,判断所述SCR尾气后处理系统是否存在故障。The fault determination sub-module is configured to compare the probability with a preset threshold to determine whether the SCR exhaust after-treatment system has a fault.
  8. 如权利要求6所述的SCR尾气后处理系统的诊断装置,其特征在于,还包括通道切换模块,在根据所述测试项目,向所述SCR尾气后处理系统的信号通道和电源通道发送激励信号和电源信号之前,所述通道切换模块用于根据所述测试项目,对所述SCR尾气后处理系统的信号通道和/或电源通道进行切换和选择,以用于切换和选择发送至所述SCR尾气后处理系统的激励信号和/或电源信号。 A diagnostic apparatus for an SCR exhaust aftertreatment system according to claim 6, further comprising a channel switching module for transmitting an excitation signal to a signal channel and a power channel of said SCR exhaust aftertreatment system according to said test item And the power switching signal, the channel switching module is configured to switch and select a signal channel and/or a power channel of the SCR exhaust aftertreatment system according to the test item, for switching and selecting to send to the SCR The excitation signal and/or power signal of the exhaust aftertreatment system.
  9. 一种SCR尾气后处理系统的诊断装置,包括存储器、处理器以及存储在所述存储器中并可在所述处理器上运行的计算机程序,其特征在于,所述处理器执行所述计算机程序时实现如权利要求1至5任一项所述方法的步骤。A diagnostic device for an SCR exhaust aftertreatment system, comprising a memory, a processor, and a computer program stored in the memory and operative on the processor, wherein the processor executes the computer program The steps of the method of any one of claims 1 to 5.
  10. 一种计算机可读存储介质,所述计算机可读存储介质存储有计算机程序,其特征在于,所述计算机程序被处理器执行时实现如权利要求1至5任一项所述方法的步骤。A computer readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the steps of the method of any one of claims 1 to 5.
PCT/CN2017/086671 2017-05-31 2017-05-31 Diagnosis method and diagnosis device for src exhaust gas aftertreatment system WO2018218533A1 (en)

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