CN113655779A - Test method for discharging related network fault codes - Google Patents
Test method for discharging related network fault codes Download PDFInfo
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- CN113655779A CN113655779A CN202110939946.4A CN202110939946A CN113655779A CN 113655779 A CN113655779 A CN 113655779A CN 202110939946 A CN202110939946 A CN 202110939946A CN 113655779 A CN113655779 A CN 113655779A
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- 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
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
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Abstract
The invention relates to a test method for discharging relevant network fault codes, which comprises the steps of stopping sending relevant node messages by using a diagnosis service after an ON gear is arranged ON a test vehicle so as to replace the operation of pulling out a node connector in the conventional method; after stopping sending the messages on the vehicle, simulating and sending the messages to be stopped by using test software; manually meeting the requirement of a driving cycle by starting a vehicle, stepping on an accelerator and running; finally, stopping sending related messages in a certain period according to the fault generating condition, so that related faults occur on the bus and flameout is realized; the condition that the operation cycle fails for a plurality of times can be simulated, so that whether the ECU normally reports the DTC according to the established strategy is judged. The invention can avoid the difficulty of manually plugging and unplugging the ECU connector of the real vehicle, easily realize the message sending and the sending stopping, and can simulate and send the real vehicle data according to the requirement without being limited by the self state of the real vehicle; the method can automatically stop sending messages in a certain period so as to achieve the effect of accurately simulating the fault state.
Description
Technical Field
The invention relates to the technical field of automobile electronics, in particular to a test method for discharging related network fault codes.
Background
The vehicle Electric Control Unit (ECU) generally has the functions of fault self-diagnosis and protection, when the system has faults, the system can automatically record fault codes in the RAM and adopt protection measures to read a substitute program from the inherent program to maintain the operation of the engine, and meanwhile, the fault information can be displayed on an instrument panel and kept unchanged, so that a vehicle owner can find the problems in time and drive the vehicle to a repair shop. In some medium and high-grade vehicles, the ECU is applied to an engine, the trace of the ECU can be found in other places, for example, an anti-lock brake system and the like are provided with the respective ECUs, information transmission among a plurality of ECUs adopts a multiplexing communication network technology, and the ECUs of the whole vehicle form a network system.
Along with the increasing functions and diversified configurations of automobiles, the number of the ECUs is increasing, the number of the ECUs is also increasing, the interaction between the ECUs through the bus is also increasing, when bus signals needed by one ECU are lost or invalid, the function of the ECU is influenced, the ECU can record and report the problem in the form of diagnostic fault codes (DTC for short) according to a certain rule, a host factory generally builds a test system through a rack, and simulates related bus faults under the condition of a single node to perform logic rationality test on the network DTC recorded by the ECUs.
However, for an emission-related ECU such as an engine, transmission, etc., the loss or ineffectiveness of certain bus signals may cause the vehicle to enter limp limits, thereby affecting emissions. According to relevant regulation requirements, emission-related DTCs require two driving cycles or two warming-up cycles to allow confirmation according to different fault levels, and the driving cycles and the warming-up cycles need to meet the conditions of rotating speed, vehicle speed, water temperature and the like and cannot be realized under the condition of single node.
At present, a host factory either lacks relevant test cases for the DTCs or roughly tests the DTCs in a mode of plugging and unplugging relevant ECUs under the real vehicle condition, obviously, the purpose of accurately verifying DTC logic cannot be achieved by the rough and imperfect test modes, and difficulty is also increased for after-sale fault analysis.
According to the technical scheme of the invention, designers can summarize the analysis and the existing common technical means for testing the automobile network fault codes, and the methods have corresponding disadvantages after implementation and application and are mainly exposed to the following aspects:
firstly, under the condition that a test case is missing or the test is inaccurate, the aim of verifying the DTC logic cannot be achieved actually;
secondly, in the real vehicle test, some ECUs are covered by other parts or the operation space is very limited, so that the connector is difficult to pull out and insert;
thirdly, some large DTC test cabinets adopted in the test link are influenced by factors such as the volume, the wiring harness and the field, and are difficult to apply to real vehicle tests;
and fourthly, after-sale problems lack of test data support and are difficult to reproduce and investigate.
In summary, the present invention provides a test method for discharging relevant network fault codes by performing experience summary through practical application based ON the prior known technology, and after an ON-shift is given to a test vehicle, a diagnostic service is used to stop sending of relevant node messages to replace the operation of pulling out a node connector in the conventional method, then the sending of relevant messages is simulated, so that the bus messages have no difference from the actual situation, then the requirements of driving cycles are manually met by starting the vehicle, stepping ON an accelerator, driving and other operations, and finally the sending of relevant messages for a certain period is stopped according to fault generation conditions, so that relevant faults appear ON the bus, the bus is flameout, the operation is repeated, and the condition that faults occur in multiple operation cycles can be simulated, so as to judge whether the ECU normally reports the DTC according to the established strategy. The proposed solution thus enables to alleviate, partially solve or completely solve the problems of the prior art.
Disclosure of Invention
In order to overcome the problems or at least partially or completely solve the problems, the invention provides a test method for discharging related network fault codes, which comprises the main steps of compiling through a diagnosis database and a network DBC database, sending a message on a stop car, simulating and sending the message to be stopped by test software, editing a test case, a test script and the like, and finally achieving the purpose of judging whether an ECU normally sends a DTC according to a set strategy.
In order to achieve the purpose, the invention adopts the following technical scheme:
a test method for emission-related network fault codes comprises the following steps:
I. the method comprises the following steps of performing semi-automatic testing under the real vehicle environment by using portable diagnostic equipment, namely connecting a test vehicle and the portable test equipment in an OBD (on-board diagnostics) mode, and connecting the test equipment to an operation terminal;
II. Compiling a diagnosis database and a network DBC database so as to facilitate subsequent operations to use related diagnosis services and simulate message transmission;
III, after an ON gear is set ON a test vehicle, firstly, using a diagnosis service to stop the transmission of related node messages so as to replace the operation of pulling out a node connector in a conventional method, wherein the diagnosis service comprises the compilation of a diagnosis database and a network DBC database;
IV, after stopping sending the messages, simulating and sending the messages to be stopped by using test software, so that the bus messages have no difference from the actual conditions;
v, artificially meeting the requirement of a driving cycle by starting vehicle operation, stepping on an accelerator and driving operation;
VI, finally, stopping sending related messages in a certain period according to the fault generation condition, so that related faults occur on the bus, and flameout;
VII, after the driving cycle is completed, repeating the previous operation, and simulating the condition that the operation cycle fails for a plurality of times, thereby judging whether the ECU normally reports the DTC according to the established strategy.
Further, the compiling method for the diagnosis database and the network DBC database comprises the following steps:
before testing a DTC, the message pointed by the DTC is required to be distinguished from the message of which ECU on the bus comes;
adding corresponding ECU and message in test software, setting the diagnosis service needed by the corresponding ECU and the content of each signal in the message, so as to change the corresponding value in the message signal subsequently to achieve the purpose of simulating different faults;
after all the diagnostic services and messages are added and set, analog sending can be tried, and if relevant messages can be read on the bus, the database is successfully edited.
For the above technical solutions, a skilled person can also make different improvements according to different design requirements during specific implementation by using some technical means to form a technical solution based on the same concept, and the specific technical means include the following:
the diagnosis service is used for stopping sending all messages of an ECU or the whole vehicle;
after the message is stopped, the edited DBC database is required to be continuously used for simulating and sending the stopped message, and the content and the period of message sending can be accurately controlled through test software;
after the simulation message is normally sent, firstly, performing DTC clearing operation on the tested ECU, and ensuring that no DTC to be tested appears before testing by reading the DTC operation, so far, formally starting a first operation cycle;
further, after the relevant message is sent in a simulated mode for a certain time, according to the generating conditions of the DTCs to be tested described in the DTC list, the relevant message is accurately stopped and sent for a certain period, normal sending is resumed, whether the DTC to be confirmed is generated or not is judged by reading the DTC operation, if the DTC to be confirmed is generated, the current operation cycle can be ended, and if the DTC to be confirmed is not generated, the period for stopping sending the message is finely adjusted until the DTC to be confirmed is generated.
In addition, various failure cases in the test case include: the test has not started, the DTC to be tested has occurred, the first operation cycle cannot generate the DTC to be confirmed, the first operation cycle has not reached the fault code generation condition and has occurred the DTC to be confirmed, the first operation cycle exceeds the fault code generation condition and has occurred the DTC to be confirmed, the first operation cycle has generated the confirmed DTC, the second operation cycle cannot generate the confirmed DTC, the second operation cycle has not reached the fault code generation condition and has generated the confirmed DTC, and the second operation cycle exceeds the fault code generation condition and has occurred the confirmed DTC.
For the above implemented technical solutions, the skilled person can also perform adaptive design, including:
the testing method simulates relevant ECU real vehicle messages through the editing of portable equipment software scripts, and the real vehicle environment is reproduced;
the method automatically stops sending messages with a certain period according to the programming logic, and accurately makes network fault conditions;
the method is used for providing evaluation for fault code strategies.
The invention adopts semi-automatic test in the real vehicle environment, and judges whether the ECU normally reports the DTC according to the established strategy by simulating the condition that a plurality of operation cycles have faults through a series of steps, thereby avoiding the difficulty of manually plugging and unplugging the ECU connector of the real vehicle, easily realizing message sending and stopping sending, and also being capable of simulating and sending real vehicle data according to the actual requirement without being limited by the state of the real vehicle; meanwhile, the message sending can be automatically stopped for a certain period so as to achieve the effect of accurately simulating the fault state; the deficiency of the emission related network fault code test is compensated, and evaluation is provided for the fault code strategy; in addition, the method can also provide troubleshooting direction and data support for the after-sale fault case.
Drawings
The invention is explained in further detail below with reference to the drawing.
FIG. 1 is a DTC test operation diagram of an emission-related network fault code implemented by the present invention;
fig. 2 is a flow chart illustrating a method for testing emission-related network fault codes according to an embodiment of the present invention.
Detailed Description
The technical means implemented by the method for testing the emission-related network fault codes to be implemented by the invention aims to solve the problem that the aim of accurately verifying the DTC logic can not be achieved due to the factors of missing test cases or inaccurate test, difficult plugging and unplugging of connectors, limited space of test equipment and the like in the conventional process of carrying out logic rationality test on the network DTC recorded by an ECU.
The technical scheme implemented by the invention is a semi-automatic test method based on a real vehicle environment, and comprises the specific steps of compiling a diagnosis database and a network DBC database, sending messages on a stopped vehicle in a simulated mode by using test software, editing test cases, editing test scripts and the like. The specific design mode, the algorithm, the testing device, the diagnosis equipment and the like of the database can be selected and matched according to the actual implementation requirements of technicians, the invention is inconvenient for limiting the types of the algorithms, the specific models adopted by the testing device, the installation mode of the diagnosis equipment and the like in detail, and the technical personnel can easily implement the device, the equipment and the like which can be suitable for the technical scheme of the invention. Therefore, the selection of a database design mode, an algorithm, a testing device, a diagnosis device and the like is included, the selection belongs to the conventional technical means in the field, the appropriate technical means can be selected according to the market products or the prior art, and for the conventional technical means which are not in the technical scheme of the invention, the specific implementation mode of the invention does not need to refine every detail, and the selection is unrealistic if the details are all listed. It is obvious that the technical solution implemented by the present invention is actually a method for testing emission-related network fault codes, which can be referred and implemented by those skilled in the art by combining with conventional technical means, and is not a design of a circuit module or a device structure, and the technical solution of the present invention can be actually applied and tested by those skilled in the art according to different application conditions and usage requirements, so as to actually obtain a series of advantages brought by the method, which will be gradually reflected in the following analysis.
As shown in fig. 1-2, the technician first performs a feasibility analysis, and then designs a specific route for executing the steps of the scheme, which is now analyzed as follows:
firstly, semi-automatic testing is carried out by using portable diagnosis equipment (Vehicle Spy) in an actual Vehicle environment, the specific connection mode refers to the mode shown in fig. 1, namely, the test Vehicle is connected with the portable test equipment in an OBD mode, and the test equipment is connected to an operation terminal;
secondly, after the test vehicle is provided with an ON gear, the diagnostic service is firstly used for stopping the transmission of the related node message so as to replace the operation of pulling out the node connector in the conventional method;
thirdly, simulating and sending related messages to ensure that the bus messages have no difference from actual conditions;
correspondingly, the requirement of driving circulation is manually met by starting the vehicle, stepping on the accelerator, driving and other operations;
finally, stopping sending related messages in a certain period according to the fault generating condition, so that related faults occur on the bus, and flameout;
sixthly, after the driving cycle is finished, repeating the previous operation, and simulating the condition that the operation cycle fails for many times to judge whether the ECU normally reports the DTC according to the established strategy.
As shown in fig. 1-2, the testing method for emission-related network fault codes implemented by the present invention, for further practical demonstration of the above proposed technical route, specifically analyzes the testing method, and lists the preferred embodiments as follows, and the steps are as follows:
one step, compiling a diagnosis database and a network DBC database:
before testing a DTC, the message pointed by the DTC is required to be distinguished from the message of which ECU on the bus comes;
adding corresponding ECU and message in test software, setting the diagnosis service needed by the corresponding ECU and the content of each signal in the message, so as to change the corresponding value in the message signal subsequently to achieve the purpose of simulating different faults;
after all the diagnostic services and messages are added and set, analog sending can be tried, and if relevant messages can be read on the bus, the database is successfully edited.
Step two, stopping sending the messages on the vehicle and simulating and sending the stopped messages by using test software:
because the message sent by ECU on the vehicle bus will not have fault, so it is necessary to stop the message sent by the relevant ECU, the message can be stopped by pulling out the ECU safety or the connector, but because the cycle of the bus message is millisecond, it is unable to control the time of stopping message accurately, and some ECUs are hidden under the vehicle carpet, the armrest box, etc., the pulling out of the connector requires destructive operation to the vehicle, and the manpower and financial resources have great loss, therefore, the diagnostic database edited in the early stage is adopted, the stopping work of all messages of a certain ECU or the whole vehicle is realized by the diagnostic service, which saves time and labor;
after the message is stopped, the edited DBC database is required to be continuously used for simulating and sending the stopped message, so that the content and the period of message sending can be accurately controlled through the test software.
Editing the test case and the test script:
the method comprises the steps that relevant ECU messages are stopped to be sent after a whole vehicle is electrified, and the tested ECU possibly records some DTCs (digital control time) in the period from the time when equipment simulates and sends the stopped messages, so that in order to eliminate interference of other factors in the test non-starting stage, the tested ECU is firstly subjected to DTC clearing operation after the simulation messages are normally sent, and no DTC to be tested appears before the test is ensured by reading the DTC;
the first operation cycle formally starts, after the relevant messages are simulated and sent for a certain time, the relevant messages are accurately stopped and sent for a certain period according to the generating conditions of the DTCs to be tested described in the DTC list, and then normal sending is resumed;
the same operation as the first operation cycle is performed in the second operation cycle until a confirmed (confirm) DTC is generated, and by this time, the test is completed, and whether the test result is qualified or not is determined according to specific situations.
Fourthly, implementing a test result accuracy guarantee mechanism:
because the final result in the test case is judged on the condition that the corresponding DTC is read, if the DTC is not read all the time or the condition is not met, the DTC is read, the DTC is unqualified, and various unqualified conditions are considered in the test case to ensure the absolute accuracy of the test result, which specifically comprises the following conditions:
firstly, a DTC to be tested appears before the test is started;
the first cycle of operation cannot generate DTCs to be validated;
third, the DTC to be confirmed already appears when the first operation cycle does not reach the fault code generation condition;
fourthly, only when the first operation cycle exceeds the fault code generation condition, the DTC to be confirmed appears;
the first cycle of operation has generated a confirmed DTC;
sixthly, the second operation cycle fails to generate a confirmed DTC;
the second operating cycle has not yet reached the fault code generating condition and has generated a confirmed DTC;
the second cycle of operation exceeds the fault code generating condition before a confirmed DTC occurs.
Therefore, the main advantage of implementing the steps is that the ECU message transmission related to the real vehicle can be stopped through the diagnostic service, and the manual unplugging of the ECU connector is replaced; the relevant ECU real vehicle messages can be simulated through the editing of the portable equipment software script, and the real vehicle environment is reproduced; and automatically stopping sending messages with a certain period according to the programmed logic, and accurately manufacturing network fault conditions.
In addition to the above technical solutions implemented by the present invention, a skilled person can design different expansion schemes according to different optimization methods, and other various expansions are designed according to different requirements of the skilled person, and are not described herein again.
In the description herein, the appearances of the phrases "embodiment one," "this embodiment," "specific implementation," and the like in connection with the description herein are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example; furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present specification, the terms "connect", "mount", "fix", "set", "have", and the like are used in a broad sense, for example, the term "connect" may be a fixed connection or an indirect connection through intermediate components without affecting the relationship and technical effects of the components, or may be an integral connection or a partial connection, as in the case of this example, for a person of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood according to specific situations.
The foregoing description of the embodiments is provided to enable any person skilled in the art to make and use the embodiments, and it is to be understood that various modifications may be readily apparent to those skilled in the art, and that the generic principles defined herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present disclosure is not limited to the above embodiments, and modifications to the following cases should be included within the scope of the present disclosure: firstly, a new technical scheme is implemented on the basis of the technical scheme and in combination with the prior common general knowledge, the technical effect generated by the new technical scheme is not beyond the technical effect of the invention, for example, the technical scheme is formed by adopting the main steps of compiling a diagnosis database and a network DBC database, sending a message on a parking car by simulating the message sent by using test software, editing a test case, a test script and the like, and the technical effect beyond the technical effect of the invention is not generated; equivalent replacement of part of the characteristics of the technical scheme of the invention by adopting the known technology produces the same technical effect as the technical effect of the invention, for example, the technical scheme of the invention is implemented by selecting a required testing device, diagnostic equipment and the like; and thirdly, the technical scheme is expanded on the basis, and the substantial content of the expanded technical scheme is not beyond the technical scheme.
Claims (10)
1. A test method for emission-related network fault codes is characterized by comprising the following steps:
I. the method comprises the following steps of performing semi-automatic testing under the real vehicle environment by using portable diagnostic equipment, namely connecting a test vehicle and the portable test equipment in an OBD (on-board diagnostics) mode, and connecting the test equipment to an operation terminal;
II, compiling a diagnosis database and a network DBC database so as to facilitate subsequent operation and use of related diagnosis services and simulation message transmission;
after an ON gear is set ON a test vehicle, firstly, diagnostic service is used for stopping the transmission of related node messages so as to replace the operation of pulling out a node connector in a conventional method, wherein the diagnostic service comprises the compilation of a diagnostic database and a network DBC database;
IV, after stopping sending the messages, simulating and sending the messages to be stopped by using test software, so that the bus messages have no difference from the actual conditions;
v, artificially meeting the requirement of a driving cycle by starting vehicle operation, stepping on an accelerator and driving operation;
VI, finally, stopping sending related messages in a certain period according to the fault generation condition, so that related faults occur on the bus, and flameout;
and VII, after the driving cycle is completed, repeating the previous operation, and simulating the condition that the operation cycle fails for many times, thereby judging whether the ECU normally reports the DTC according to the established strategy.
2. The method for testing emission-related network fault codes according to claim 1, wherein the method for compiling the diagnosis database and the network DBC database is as follows:
before testing a DTC, the message pointed by the DTC is required to be distinguished from the message of which ECU on the bus comes;
adding corresponding ECU and message in test software, setting the diagnosis service needed by the corresponding ECU and the content of each signal in the message, so as to change the corresponding value in the message signal subsequently to achieve the purpose of simulating different faults;
after all the diagnostic services and messages are added and set, analog sending can be tried, and if relevant messages can be read on the bus, the database is successfully edited.
3. The method of testing an emissions-related network fault code as claimed in claim 2, wherein:
the diagnosis service is used for stopping sending all messages of a certain ECU or the whole vehicle.
4. The method of testing an emissions-related network fault code as claimed in claim 1, wherein: after the message is stopped, the edited DBC database is required to be continuously used for simulating and sending the stopped message, and the content and the period of message sending can be accurately controlled through the test software.
5. The test method of emission-related network fault codes according to any one of claims 1 to 4, wherein: after the simulation message is normally sent, firstly, a DTC clearing operation is carried out on the tested ECU, and the DTC is read to ensure that no DTC to be tested appears before the test, so far, the first operation cycle is formally started.
6. The method of testing an emissions related network fault code as claimed in claim 5, wherein: after the simulation transmission of the relevant messages is carried out for a certain time, according to the DTC generation conditions to be tested described in the DTC list, the relevant messages are accurately stopped and transmitted for a certain period, then normal transmission is resumed, the DTC operation is read to judge whether the DTC to be confirmed is generated, if the DTC to be confirmed is generated, the current operation cycle can be ended, and if the DTC to be confirmed is not generated, the period of the stop transmission of the messages is finely adjusted until the DTC to be confirmed is generated.
7. The method for testing emission-related network fault codes according to any one of claims 1 to 4, wherein the various cases of failure in the test case include: the test has not started, the DTC to be tested has occurred, the first operation cycle cannot generate the DTC to be confirmed, the first operation cycle has not reached the fault code generation condition and has occurred the DTC to be confirmed, the first operation cycle exceeds the fault code generation condition and has occurred the DTC to be confirmed, the first operation cycle has generated the confirmed DTC, the second operation cycle cannot generate the confirmed DTC, the second operation cycle has not reached the fault code generation condition and has generated the confirmed DTC, and the second operation cycle exceeds the fault code generation condition and has occurred the confirmed DTC.
8. The method of testing an emissions-related network fault code as claimed in claim 1, wherein: the testing method simulates relevant ECU real vehicle messages through the editing of portable equipment software scripts, and the real vehicle environment is reproduced.
9. The method of testing an emissions-related network fault code as claimed in claim 1, wherein: the method automatically stops sending messages with a certain period according to the programming logic, and accurately makes network fault conditions.
10. The method of testing an emissions-related network fault code as claimed in claim 1, wherein: the method is used for providing evaluation for fault code strategies.
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| CN115065628A (en) * | 2022-05-30 | 2022-09-16 | 一汽奔腾轿车有限公司 | Automatic test method and test system for self-clearing of fault codes of sleep-free strategy controller |
| CN115065628B (en) * | 2022-05-30 | 2024-02-13 | 一汽奔腾轿车有限公司 | Automatic test method and test system for fault code self-clearing of controller without sleep strategy |
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