WO2023231279A1 - 一种车身控制单元故障码测试系统及方法 - Google Patents

一种车身控制单元故障码测试系统及方法 Download PDF

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WO2023231279A1
WO2023231279A1 PCT/CN2022/127305 CN2022127305W WO2023231279A1 WO 2023231279 A1 WO2023231279 A1 WO 2023231279A1 CN 2022127305 W CN2022127305 W CN 2022127305W WO 2023231279 A1 WO2023231279 A1 WO 2023231279A1
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fault
control unit
switch
test
computer
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PCT/CN2022/127305
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English (en)
French (fr)
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刘德利
孙运玺
谷原野
王升鑫
张海波
王全庆
王晰聪
白爽
孙云
马文峰
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一汽奔腾轿车有限公司
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Publication of WO2023231279A1 publication Critical patent/WO2023231279A1/zh

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B23/00—Testing or monitoring of control systems or parts thereof
    • G05B23/02—Electric testing or monitoring
    • G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
    • G05B23/0208—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system
    • G05B23/0213—Modular or universal configuration of the monitoring system, e.g. monitoring system having modules that may be combined to build monitoring program; monitoring system that can be applied to legacy systems; adaptable monitoring system; using different communication protocols
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/24—Pc safety
    • G05B2219/24065—Real time diagnostics
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Definitions

  • the invention belongs to the technical field of automotive electrical testing, and in particular relates to a vehicle body control unit fault code testing system and method.
  • the body control unit is one of the important control units of the vehicle, and the testing of body control unit fault codes occupies a very important position.
  • the traditional body control unit fault code testing scheme has many shortcomings such as poor testing accuracy, high destructiveness, and incomplete coverage. Based on the above situation, there is an urgent need to develop a body control unit fault code testing system.
  • the present invention provides a vehicle body control unit fault code testing system and method.
  • Testers can use this system to create short circuit, open circuit, overvoltage, and undervoltage faults without damaging the wiring harness, and can pass Synchronous comparison of fault code information on the computer is conducive to recording and locating problems; compared with traditional testing methods, this system and method can avoid damage to the wiring harness, while improving test accuracy and thus test coverage.
  • a vehicle body control unit fault code testing system including a program-controlled power supply, a fault injection device, a CAN box and a computer terminal; the computer terminal is connected to the program-controlled power supply, and the program-controlled power supply is used to electrically connect with the control unit under test and is the control unit under test Provide overvoltage and undervoltage, the computer terminal is connected to the CAN box control, the CAN box is connected to the signal of the control unit under test, and the fault code information can be read from the control unit under test;
  • the fault injection device includes a first switch, a second switch, a third switch and a power supply, wherein the computer terminal is connected to the first switch, the second switch and the third switch and can control the first switch, the second switch and the third switch.
  • the switch is a switch, and one end of the first switch is connected to the control unit under test through a wire, and the other end is connected to the power supply through a wire.
  • One end of the second switch is connected to the control unit under test through a wire, and the other end is connected to the vehicle for use through a wire.
  • One end of the third switch is connected to the control unit under test through a wire, and the other end is grounded through a wire.
  • the fault injection device also includes a voltage measurement module, in which the first switch, the second switch, and the third switch are connected to the same wire and connected to the control unit under test, and a voltage measurement module is connected to the line.
  • the voltage measurement module The other end is grounded.
  • the voltage measurement module is a voltmeter.
  • a vehicle body control unit fault code testing method includes the following contents:
  • Step 1 Make settings on the computer so that the computer can program-control the voltage output by the power supply and match it with the CAN box, and then read the fault code information from the CAN box, and the computer controls the start-up time of the CAN box and the fault injection device. Synchronize;
  • Step 2 The computer sets the fault code test type according to the test content.
  • the fault code test type includes overvoltage fault, undervoltage fault, open circuit fault and short circuit fault;
  • the overvoltage fault is caused by the computer controlling the second switch to turn on, and at the same time controlling the program-controlled power supply to input overvoltage to the control unit under test;
  • Under-voltage fault means that the computer controls the second switch to turn on, and at the same time controls the program-controlled power supply to input under-voltage to the control unit under test;
  • the open circuit fault means that the first switch, the second switch, and the third switch controlled by the computer are all disconnected
  • a short circuit fault occurs when the computer controls the first switch to be turned on or the third switch to be turned on;
  • Step 3 The computer sets the fault code test content according to the test content.
  • the fault code test content includes fault trigger time, fault trigger operation, fault hold, fault self-clearing and fault code function degradation;
  • the fault triggering time is from the beginning of the fault to the end of the fault. Is the time when the computer can read the fault code from the CAN box consistent with the actual time of the fault?
  • the fault triggering operation is when any fault of the fault code test type in step 2 of the computer control occurs, whether the state of the control unit under test is the same as the state that it should produce when the corresponding fault occurs;
  • Fault maintenance refers to whether the fault code read by the computer from the CAN box is consistent with the status of the fault code recorded in the control unit under test;
  • Fault self-clearing means that after each fault ends, the computer controls the program-controlled power supply to power on and off multiple times. After the last power on and off, whether the control unit under test automatically eliminates the historical fault codes;
  • the fault code function degradation refers to whether the tested control unit can make the corresponding functional degradation state according to the functional requirements of the controlled unit when any fault of the fault code test type occurs in the second step of the computer control;
  • Step 4 The tester combines the fault code test type in step 2 and the fault code test content in step 3 to form a test case on the computer as needed;
  • Step 5 The computer controls the corresponding components according to the test case to complete the test, records the data read during the test, compares the data read during the test with the functional requirements, obtains the test results, and completes the body control unit fault code test verification.
  • the function degradation state of the fault code in step three includes a function off state, a function on state, a function alarm state and a function standby state.
  • the invention uses the computer terminal to adjust the power supply of the control unit under test with the help of a program-controlled power supply, thereby accurately adjusting the time and voltage value of overvoltage and undervoltage; the computer terminal uses the CAN box to read the fault code information of the control unit under test in real time;
  • the injection device is connected in series between the control unit under test and the vehicle without damaging the wiring harness, accepts computer control instructions, and accurately realizes the duration of open circuit and short circuit; in addition, the voltage value, fault code information, open circuit, short circuit information, etc. are all Synchronous comparative analysis on the computer side improves the accuracy of fault code testing and facilitates testers and developers to analyze and locate problems.
  • Figure 1 is an architecture diagram of the test system of the present invention.
  • Figure 2 is a schematic diagram of the fault injection device of the present invention.
  • connection should be understood in a broad sense.
  • it can be a fixed connection, a detachable connection, or an integral body.
  • It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interaction between two elements.
  • the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.
  • the term “above” or “below” a first feature of a second feature may include direct contact between the first and second features, or may also include the first and second features. Not in direct contact but through additional characteristic contact between them.
  • the terms “above”, “above” and “above” a first feature on a second feature include the first feature being directly above and diagonally above the second feature, or simply mean that the first feature is higher in level than the second feature.
  • “Below”, “under” and “under” the first feature is the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature is less horizontally than the second feature.
  • a vehicle body control unit fault code testing system includes a program-controlled power supply, a fault injection device, a CAN box and a computer terminal; the computer terminal is connected to the program-controlled power supply, and the program-controlled power supply is used to electrically connect with the control unit under test , providing overvoltage and undervoltage to the control unit under test, the computer terminal is connected to the CAN box for control, the CAN box is connected to the control unit under test for signal control, and the fault code information can be read from the control unit under test;
  • the fault injection device includes a first switch, a second switch, a third switch and a power supply.
  • the computer terminal is connected to the first switch, the second switch and the third switch and can control the first switch, the second switch and the third switch.
  • the switches of the second switch and the third switch, and one end of the first switch is connected to the control unit under test through a wire, and the other end is connected to the power supply through a wire.
  • One end of the second switch is connected to the control unit under test through a wire, and the other end is connected through a wire.
  • the wires are connected to components on the vehicle used to connect the control unit under test.
  • One end of the third switch is connected to the control unit under test through the wires, and the other end is grounded through the wires.
  • the fault injection device also includes a voltage measurement module, in which the first switch, the second switch, and the third switch are connected to the same wire and connected to the control unit under test, and a voltage measurement module is connected to the line.
  • the voltage measurement module The other end is grounded.
  • the voltage measurement module is a voltmeter.
  • a vehicle body control unit fault code testing method includes the following contents:
  • Step 1 Make settings on the computer so that the computer can program-control the voltage output by the power supply and match it with the CAN box, and then read the fault code information from the CAN box, and the computer controls the start-up time of the CAN box and the fault injection device. Synchronize;
  • Step 2 The computer sets the fault code test type according to the test content.
  • the fault code test type includes overvoltage fault, undervoltage fault, open circuit fault and short circuit fault;
  • the overvoltage fault is caused by the computer controlling the second switch to turn on, and at the same time controlling the program-controlled power supply to input overvoltage to the control unit under test;
  • Under-voltage fault means that the computer controls the second switch to turn on, and at the same time controls the program-controlled power supply to input under-voltage to the control unit under test;
  • the open circuit fault means that the first switch, the second switch, and the third switch controlled by the computer are all disconnected
  • a short circuit fault occurs when the computer controls the first switch to be turned on or the third switch to be turned on;
  • Step 3 The computer sets the fault code test content according to the test content.
  • the fault code test content includes fault trigger time, fault trigger operation, fault hold, fault self-clearing and fault code function degradation;
  • the fault triggering time is from the beginning of the fault to the end of the fault. Is the time when the computer can read the fault code from the CAN box consistent with the actual time of the fault?
  • the fault triggering operation is when any fault of the fault code test type in step 2 of the computer control occurs, whether the state of the control unit under test is the same as the state that it should produce when the corresponding fault occurs;
  • Fault maintenance refers to whether the fault code read by the computer from the CAN box is consistent with the status of the fault code recorded in the control unit under test (whether the fault code read is a current fault or a historical fault);
  • Fault self-clearing means that after each fault ends, the computer controls the program-controlled power supply to power on and off 40 times respectively. After the last power on and off, whether the control unit under test automatically eliminates the historical fault codes;
  • the fault code function is downgraded to whether the control unit under test can perform corresponding functions according to the functional requirements of the controlled unit (depending on the unit under test itself) when any fault of the fault code test type in step 2 of the computer control occurs. Degraded status;
  • Step 4 The tester combines the fault code test type in step 2 and the fault code test content in step 3 to form a test case on the computer as needed;
  • Step 5 The computer controls the corresponding components according to the test case to complete the test, records the data read during the test, compares the data read during the test with the functional requirements, obtains the test results, and completes the body control unit fault code test verification.
  • the function degradation state of the fault code in step three includes a function off state, a function on state, a function alarm state and a function standby state. Different tested control units exhibit different fault code function degradation states when facing different faults.
  • a body control unit fault code testing system and method A body control unit fault code testing system and method.
  • This test system consists of program-controlled power supply, fault injection device, CAN box and computer terminal. Its characteristics are: the computer end is connected to the program-controlled power supply, and the program-controlled power supply is connected to the control unit under test to realize software control of over-voltage and under-voltage; the computer end is connected to the CAN box, and the CAN box is connected to the control unit under test to obtain fault codes. Information; the computer end is connected to the fault injection device, one end of the fault injection device is connected to the control unit under test, and the other end is connected to the vehicle to realize open circuit, short circuit and other faults.
  • the test method includes the following steps:
  • Step 1 Connect the test system equipment. Connect the computer end to the program-controlled power supply.
  • the program-controlled power supply is connected to the control unit under test.
  • the computer end is connected to the CAN box.
  • the CAN box is connected to the control unit under test.
  • the computer end is connected to the fault injection device.
  • the fault injection device is connected to the control unit under test, and the fault injection device is connected to the vehicle.
  • Step 2 Software configuration. After the equipment is connected, CAN software configuration is required, including diagnostic ID and diagnostic services. After the configuration is completed, set the fault injection type according to the test content. And the CAN software and fault injection device are adjusted to the network time for synchronization.
  • Step 3 The test case composition ideas used in this test system and method include: fault code test type, fault code test content and fault code function degradation.
  • the fault code test of the control unit under test includes fault code test type, fault code test content and fault code function degradation.
  • the fault code test types mainly include overvoltage fault, undervoltage fault, open circuit fault and short circuit fault.
  • the fault code test content mainly includes fault triggering time, fault triggering operation, fault holding and fault self-clearing.
  • the fault code function degradation mainly includes function off state, function on state, function alarm state and function standby state.
  • Step 5 Comprehensively consider the fault code test type, fault code test content and fault code function degradation to obtain a test case.
  • Step 6 After completing the generation of test cases, execute the test cases. During the execution, the corresponding data of each test case is recorded through the test system, including fault information and fault injection related information of the control unit under test.
  • Step 7 Complete the test execution work, compare the test data with the functional requirements, and obtain the test results. Complete body control unit fault code test verification.
  • any combination of various embodiments of the present invention can also be carried out. As long as they do not violate the idea of the present invention, they should also be regarded as the disclosed content of the present invention.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

一种车身控制单元故障码测试系统及方法，包括程控电源、故障注入装置、CAN盒与电脑端；其中电脑端与程控电源控制连接，程控电源用于与被测控制单元电连接，为被测控制单元提供过电压和欠电压，电脑端与CAN盒控制连接，CAN盒与被测控制单元信号连接，能够从被测控制单元读取故障码信息；测试人员可以通过此系统在不破坏线束的前提下，制造短路、开路、过电压、欠电压的故障，并能通过电脑端与故障码信息进行同步对比，有利于问题的记录与定位；此系统和方法相比于传统的测试方式，可以避免对线束的破坏，同时能够提高测试精度，进而提高测试覆盖度。

Description

一种车身控制单元故障码测试系统及方法 技术领域
本发明属于汽车电气测试技术领域，尤其涉及一种车身控制单元故障码测试系统及方法。
背景技术
随着汽车电气技术的发展，电气功能相关的故障率也随之增加，那么如何排查定位问题就成了当前车辆维修保养的重中之重。其中，车身控制单元作为车辆的重要控制单元之一，车身控制单元故障码的测试占据了非常重要的地位。而传统的车身控制单元故障码测试方案存在测试精度差、破坏性大、覆盖度不全等诸多不足，基于上述现状，亟需开发一种车身控制单元故障码测试系统。
发明内容
为了克服上述问题，本发明提供一种车身控制单元故障码测试系统及方法，测试人员可以通过此系统在不破坏线束的前提下，制造短路、开路、过电压、欠电压的故障，并能通过电脑端与故障码信息进行同步对比，有利于问题的记录与定位；此系统和方法相比于传统的测试方式，可以避免对线束的破坏，同时能够提高测试精度，进而提高测试覆盖度。
一种车身控制单元故障码测试系统，包括程控电源、故障注入装置、CAN盒与电脑端；其中电脑端与程控电源控制连接，程控电源用于与被测控制单元电连接，为被测控制单元提供过电压和欠电压，电脑端与CAN盒控制连接，CAN盒与被测控制单元信号连接，能够从被测控制单元读取故障码信息；
所述故障注入装置包括第一开关、第二开关、第三开关和电源，其中电脑 端与第一开关、第二开关、第三开关控制连接，能够控制第一开关、第二开关、第三开关的开关，且第一开关的一端通过导线与被测控制单元连接，另一端通过导线与电源连接，第二开关的一端通过导线与被测控制单元连接，另一端通过导线与车辆上用于连接被测控制单元的元件连接，第三开关的一端通过导线与被测控制单元连接，另一端通过导线接地。
所述故障注入装置还包括电压测量模块，其中第一开关、第二开关、第三开关共同接入同一条导线与被测控制单元连接，且在该线路上连接有电压测量模块，电压测量模块的另一端接地。
所述电压测量模块为电压表。
一种车身控制单元故障码测试方法，包括如下内容：
步骤一，在电脑端进行设置，使得电脑端能够程控电源输出的电压，并能够与CAN盒匹配，进而从CAN盒内读取故障码信息，且电脑端控制CAN盒和故障注入装置的启动时间同步；
步骤二，电脑端根据测试内容设置故障码测试类型，所述故障码测试类型包括过电压故障、欠电压故障、开路故障与短路故障；
其中过电压故障为电脑端控制第二开关导通，同时控制程控电源向被测控制单元输入过电压；
欠电压故障为电脑端控制第二开关导通，同时控制程控电源向被测控制单元输入欠电压；
开路故障为电脑端控制第一开关、第二开关、第三开关均断开；
短路故障为电脑端控制第一开关导通或第三个开关导通；
步骤三，电脑端根据测试内容设置故障码测试内容，所述故障码测试内容包括故障触发时间、故障触发操作、故障保持、故障自清除和故障码功能降级；
其中故障触发时间为从产生故障开始直到故障结束，电脑端从CAN盒能够读到故障码的时间是否与故障实际产生时间一致；
故障触发操作为当电脑端控制步骤二中故障码测试类型的任意一种故障发生时，被测控制单元的状态是否与对应故障发生时其所应产生的状态相同；
故障保持为电脑端从CAN盒读取到的故障码和被测控制单元内记录的故障码状态是否一致；
故障自清除为在每个故障结束后，电脑端控制程控电源分别上下电多次，最后一次上下电后，被测控制单元是否自动将历史故障码消除；
故障码功能降级为当电脑端控制步骤二中故障码测试类型的任意一种故障发生时，被测控制单元是否能根据被控单元的功能需求做出相应的功能降级状态；
步骤四，测试者根据需要在电脑端将步骤二中的故障码测试类型及步骤三中的故障码测试内容进行组合形成测试用例；
步骤五，电脑端按照测试用例控制对应部件完成测试，并记录测试过程中其所读取的数据，对比测试中读取的数据与功能要求，获得测试结果，完成车身控制单元故障码测试验证。
所述步骤二中的短路故障中电脑端控制第一开关导通时为短路电故障，电脑端控制第三个开关导通时为短路地故障。
所述步骤三中故障码功能降级状态包括功能关闭状态、功能开启状态、功能报警状态和功能待机状态。
本发明的有益效果：
本发明通过电脑端借助程控电源调节被测控制单元的电源，从而精准调节过电压和欠电压的时间和电压值；通过电脑端借助CAN盒进行实时读取被测控制单元的故障码信息；故障注入装置在不破坏线束的情况，串联在被测控制单元与车辆之间，接受电脑端控制指令，精准实现开路、短路的持续时间；此外，电压值、故障码信息、开路、短路信息等均在电脑端进行同步对比分析，提高 了故障码测试的精度，利于测试和开发人员进行问题分析及定位。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对本发明实施例描述中所要使用的附图作简单的介绍，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的前提下，还可以根据本发明实施例的内容和这些附图获得其他的附图。
图1为本发明的测试系统架构图。
图2为本发明的故障注入装置示意图。
具体实施方式
下面结合附图和实施例对本发明作进一步的详细说明。可以理解的是，此处所描述的具体实施例仅仅用于解释本发明，而非对本发明的限定。另外还需要说明的是，为了便于描述，附图中仅示出了与本发明相关的部分而非全部结构。
在本发明的描述中，除非另有明确的规定和限定，术语“相连”、“连接”、“固定”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本发明中的具体含义。
在本发明中，除非另有明确的规定和限定，第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接接触，也可以包括第一和第二特征不是直接接触而是通过它们之间的另外的特征接触。而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅 仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。
在本实施例的描述中，术语“上”、“下”、“左”、“右”等方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述和简化操作，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。此外，术语“第一”、“第二”仅仅用于在描述上加以区分，并没有特殊的含义。
实施例1
如图1所示，一种车身控制单元故障码测试系统，包括程控电源、故障注入装置、CAN盒与电脑端；其中电脑端与程控电源控制连接，程控电源用于与被测控制单元电连接，为被测控制单元提供过电压和欠电压，电脑端与CAN盒控制连接，CAN盒与被测控制单元信号控制连接，能够从被测控制单元读取故障码信息；
如图2所示，所述故障注入装置包括第一开关、第二开关、第三开关和电源，其中电脑端与第一开关、第二开关、第三开关控制连接，能够控制第一开关、第二开关、第三开关的开关，且第一开关的一端通过导线与被测控制单元连接，另一端通过导线与电源连接，第二开关的一端通过导线与被测控制单元连接，另一端通过导线与车辆上用于连接被测控制单元的元件连接，第三开关的一端通过导线与被测控制单元连接，另一端通过导线接地。
所述故障注入装置还包括电压测量模块，其中第一开关、第二开关、第三开关共同接入同一条导线与被测控制单元连接，且在该线路上连接有电压测量模块，电压测量模块的另一端接地。
所述电压测量模块为电压表。
一种车身控制单元故障码测试方法，包括如下内容：
步骤一，在电脑端进行设置，使得电脑端能够程控电源输出的电压，并能够与CAN盒匹配，进而从CAN盒内读取故障码信息，且电脑端控制CAN盒和故障注入装置的启动时间同步；
步骤二，电脑端根据测试内容设置故障码测试类型，所述故障码测试类型包括过电压故障、欠电压故障、开路故障与短路故障；
其中过电压故障为电脑端控制第二开关导通，同时控制程控电源向被测控制单元输入过电压；
欠电压故障为电脑端控制第二开关导通，同时控制程控电源向被测控制单元输入欠电压；
开路故障为电脑端控制第一开关、第二开关、第三开关均断开；
短路故障为电脑端控制第一开关导通或第三个开关导通；
步骤三，电脑端根据测试内容设置故障码测试内容，所述故障码测试内容包括故障触发时间、故障触发操作、故障保持、故障自清除和故障码功能降级；
其中故障触发时间为从产生故障开始直到故障结束，电脑端从CAN盒能够读到故障码的时间是否与故障实际产生时间一致；
故障触发操作为当电脑端控制步骤二中故障码测试类型的任意一种故障发生时，被测控制单元的状态是否与对应故障发生时其所应产生的状态相同；
故障保持为电脑端从CAN盒读取到的故障码和被测控制单元内记录的故障码状态(读取到故障码是当前故障还是历史故障)是否一致；
故障自清除为在每个故障结束后，电脑端控制程控电源分别上下电40次，最后一次上下电后，被测控制单元是否自动将历史故障码消除；
故障码功能降级为当电脑端控制步骤二中故障码测试类型的任意一种故障发生时，被测控制单元是否能根据被控单元的功能需求(要看被测单元本身)做出相应的功能降级状态；
步骤四，测试者根据需要在电脑端将步骤二中的故障码测试类型及步骤三 中的故障码测试内容进行组合形成测试用例；
步骤五，电脑端按照测试用例控制对应部件完成测试，并记录测试过程中其所读取的数据，对比测试中读取的数据与功能要求，获得测试结果，完成车身控制单元故障码测试验证。
所述步骤二中的短路故障中电脑端控制第一开关导通时为短路电故障，电脑端控制第三个开关导通时为短路地故障。
所述步骤三中故障码功能降级状态包括功能关闭状态、功能开启状态、功能报警状态和功能待机状态。不同的被测控制单元在面临不同的故障时所表现出的故障码功能降级状态是不同的。
实施例2
一种车身控制单元故障码测试系统及方法。
此测试系统包括程控电源、故障注入装置、CAN盒与电脑端构成。其特征在于：电脑端与程控电源连接，程控电源与被测控制单元连接，实现用软件控制过电压、欠电压；电脑端与CAN盒连接，CAN盒与被测控制单元连接，实现获取故障码信息；电脑端与故障注入装置连接，故障注入装置的一端与被测控制单元连接，另一端与车辆连接，实现开路、短路等故障。
测试方法包括如下步骤：
步骤一，测试系统设备连接，将电脑端与程控电源相连接，程控电源与被测控制单元连接，电脑端与CAN盒连接，CAN盒与被测控制单元连接，电脑端与故障注入装置连接，故障注入装置与被测控制单元连接，故障注入装置与车辆连接。
步骤二，软件配置，设备接连完毕，需要进行CAN软件配置，包括诊断ID，诊断服务。配置完成后，根据测试内容设置故障注入类型。并且CAN软件盒故障注入装置均调整为网络时间，以便同步。
步骤三，本测试系统和方法所使用测试用例构成思路包括：故障码测试类 型、故障码测试内容和故障码功能降级。
步骤四，被测控制单元故障码测试包括故障码测试类型、故障码测试内容和故障码功能降级。其中，故障码测试类型主要有过电压故障、欠电压故障、开路故障与短路故障。故障码测试内容主要有故障触发时间、故障触发操作、故障保持和故障自清除。故障码功能降级主要有功能关闭状态、功能开启状态、功能报警状态和功能待机状态。
步骤五，综合考虑故障码测试类型、故障码测试内容和故障码功能降级，得到测试用例。
步骤六，完成生成测试用例后，执行测试用例，执行过程中，通过测试系统记录各条测试用例相应数据，包括被测控制单元的故障信息与故障注入相关信息。
步骤七，完成测试执行工作，对比测试数据与功能要求，获得测试结果。完成车身控制单元故障码测试验证。
以上结合附图详细描述了本发明的优选实施方式，但是，本发明的保护范围并不局限于上述实施方式中的具体细节，在本发明的技术构思范围内，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，根据本发明的技术方案及其发明构思加以等同替换或改变，这些简单变型均属于本发明的保护范围。
另外需要说明的是，在上述具体实施方式中所描述的各个具体技术特征，在不矛盾的情况下，可以通过任何合适的方式进行组合，为了避免不必要的重复，本发明对各种可能的组合方式不再另行说明。
此外，本发明的各种不同的实施方式之间也可以进行任意组合，只要其不违背本发明的思想，其同样应当视为本发明所公开的内容。

Claims (6)

  1. 一种车身控制单元故障码测试系统，其特征在于包括程控电源、故障注入装置、CAN盒与电脑端；其中电脑端与程控电源控制连接，程控电源用于与被测控制单元电连接，为被测控制单元提供过电压和欠电压，电脑端与CAN盒控制连接，CAN盒与被测控制单元信号连接，能够从被测控制单元读取故障码信息；
    所述故障注入装置包括第一开关、第二开关、第三开关和电源，其中电脑端与第一开关、第二开关、第三开关控制连接，能够控制第一开关、第二开关、第三开关的开关，且第一开关的一端通过导线与被测控制单元连接，另一端通过导线与电源连接，第二开关的一端通过导线与被测控制单元连接，另一端通过导线与车辆上用于连接被测控制单元的元件连接，第三开关的一端通过导线与被测控制单元连接，另一端通过导线接地。
  2. 根据权利要求1所述的一种车身控制单元故障码测试系统，其特征在于所述故障注入装置还包括电压测量模块，其中第一开关、第二开关、第三开关共同接入同一条导线与被测控制单元连接，且在该线路上连接有电压测量模块，电压测量模块的另一端接地。
  3. 根据权利要求2所述的一种车身控制单元故障码测试系统，其特征在于所述电压测量模块为电压表。
  4. 一种车身控制单元故障码测试方法，其特征在于包括如下内容：
    步骤一，在电脑端进行设置，使得电脑端能够程控电源输出的电压，并能够与CAN盒匹配，进而从CAN盒内读取故障码信息，且电脑端控制CAN盒和故障注入装置的启动时间同步；
    步骤二，电脑端根据测试内容设置故障码测试类型，所述故障码 测试类型包括过电压故障、欠电压故障、开路故障与短路故障；
    其中过电压故障为电脑端控制第二开关导通，同时控制程控电源向被测控制单元输入过电压；
    欠电压故障为电脑端控制第二开关导通，同时控制程控电源向被测控制单元输入欠电压；
    开路故障为电脑端控制第一开关、第二开关、第三开关均断开；
    短路故障为电脑端控制第一开关导通或第三个开关导通；
    步骤三，电脑端根据测试内容设置故障码测试内容，所述故障码测试内容包括故障触发时间、故障触发操作、故障保持、故障自清除和故障码功能降级；
    其中故障触发时间为从产生故障开始直到故障结束，电脑端从CAN盒能够读到故障码的时间是否与故障实际产生时间一致；
    故障触发操作为当电脑端控制步骤二中故障码测试类型的任意一种故障发生时，被测控制单元的状态是否与对应故障发生时其所应产生的状态相同；
    故障保持为电脑端从CAN盒读取到的故障码和被测控制单元内记录的故障码状态是否一致；
    故障自清除为在每个故障结束后，电脑端控制程控电源分别上下电多次，最后一次上下电后，被测控制单元是否自动将历史故障码消除；
    故障码功能降级为当电脑端控制步骤二中故障码测试类型的任意一种故障发生时，被测控制单元是否能根据被控单元的功能需求做出相应的功能降级状态；
    步骤四，测试者根据需要在电脑端将步骤二中的故障码测试类型 及步骤三中的故障码测试内容进行组合形成测试用例；
    步骤五，电脑端按照测试用例控制对应部件完成测试，并记录测试过程中其所读取的数据，对比测试中读取的数据与功能要求，获得测试结果，完成车身控制单元故障码测试验证。
  5. 根据权利要求4所述的一种车身控制单元故障码测试方法，其特征在于所述步骤二中的短路故障中电脑端控制第一开关导通时为短路电故障，电脑端控制第三个开关导通时为短路地故障。
  6. 根据权利要求4所述的一种车身控制单元故障码测试方法，其特征在于所述步骤三中故障码功能降级状态包括功能关闭状态、功能开启状态、功能报警状态和功能待机状态。
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