CN219392518U

CN219392518U - CAN bus fault injection test system

Info

Publication number: CN219392518U
Application number: CN202320701271.4U
Authority: CN
Inventors: 吕茂林
Original assignee: Chongqing Changan Automobile Co Ltd
Current assignee: Chongqing Changan Automobile Co Ltd
Priority date: 2023-03-31
Filing date: 2023-03-31
Publication date: 2023-07-21
Anticipated expiration: 2033-03-31

Abstract

The utility model relates to the field of automobile detection, and provides a CAN bus fault injection test system, which comprises: the system comprises a CAN bus analyzer, a CAN bus jammer, a power supply, at least one anti-signal reflection module and an upper computer. The utility model inputs faults of different types and intensity to the tested equipment by controlling the CAN bus interferometer through the upper computer, CAN quickly find the faults of the CAN bus, verifies the reliability and stability of the tested equipment, greatly reduces the test time, greatly improves the test precision and efficiency and reduces the test cost. In addition, the CAN bus interferometer CAN be directly connected to the automobile through the CAN_H network bus and the CAN_L network bus, and the simulation interference is utilized to replace actual faults, so that fault testing under the actual automobile environment is realized, irreversible damage to the automobile bus is avoided, the testing result is more real and reliable, and the testing convenience is improved.

Description

CAN bus fault injection test system

Technical Field

The utility model relates to the field of automobile detection, in particular to a CAN bus fault injection test system.

Background

In the design stage of the electronic controller of the automobile, faults possibly encountered by the electronic controller of the automobile during the working process need to be analyzed and processed in advance. The fault injection is performed on the automobile electronic controller manually, the self-diagnosis, isolation and control capability of the automobile electronic controller in the fault state and the self-recovery capability after fault removal are checked, and a basis can be provided for the reliability design of the automobile.

The existing CAN bus fault injection test system comprises an industrial personal computer, a cabinet and test boxes, wherein a digital board card is arranged in the industrial personal computer, a back board and an expansion plugboard are arranged in the cabinet, each test box is connected with a controller to be tested, each test box comprises a main control module, a power supply module, a communication module, an isolation driving module and a relay module, the system is connected with a plurality of expansion plugboards through the back board, each expansion plugboard is connected with a plurality of test boxes, each test box is connected with a form of the controller to be tested, digital signals of the digital board card are expanded step by step one to many, and various fault working condition conditions CAN be simulated by adopting a form of a CAN bus, so that the CAN bus automatic test of the controller is realized.

However, when the system performs a bus fault injection test, the system is limited by test equipment such as an industrial personal computer, a board card, a cabinet and the like, the fault injection test cannot be performed under the actual whole vehicle condition, and the test efficiency is low.

Disclosure of Invention

The utility model provides a CAN bus fault injection test system, which aims at solving the defects that the fault injection test cannot be carried out under the actual whole vehicle condition and the test efficiency is low in the prior art.

In order to solve the technical problems, the technical scheme of the utility model is as follows:

a CAN bus fault injection test system comprising: the system comprises a CAN bus analyzer, a CAN bus interferometer, a power supply, at least one anti-signal reflection module and an upper computer; the power supply is used for supplying power to the CAN bus analyzer, the CAN bus interferometer and the tested equipment; the tested equipment is connected to a CAN bus analyzer and a CAN bus interferometer through a CAN_H network bus and a CAN_L network bus; one end of the anti-signal reflection module is connected with the CAN_H network bus, and the other end of the anti-signal reflection module is connected with the CAN_L network bus; and the upper computer is in communication connection with the CAN bus interferometer.

In the technical scheme, equipment to be tested is connected into a system rack, an anti-signal reflection module is reasonably configured according to the state of the equipment to be tested, then a CAN bus interferometer is controlled by an upper computer to inject faults into the equipment to be tested, and a CAN bus analyzer is used for monitoring and detecting the communication state of a CAN bus and recording abnormal samples while the faults are injected. And verifying the reliability of the tested equipment by analyzing the recorded abnormal samples, and adjusting corresponding fault injection parameters to inject faults of different types and intensities into the equipment to be tested until the fault injection test is completed.

As an optimal technical scheme, the tested equipment is an automobile electronic controller or an automobile real vehicle.

As an optimal technical scheme, the automobile electronic controller is an I-type automobile electronic controller or an II-type automobile electronic controller.

As a preferable technical scheme, when the automobile electronic controller is an i-type automobile electronic controller, the test system is configured with two parallel anti-signal reflection modules; when the automobile electronic controller is a type II automobile electronic controller, the test system is provided with an anti-signal reflection module.

As an optimal technical scheme, the anti-signal reflection module is a terminal resistor.

As a preferable technical scheme, the resistance value of the termination resistor is 120Ω.

As an optimized technical scheme, the system further comprises an oscilloscope, wherein the positive input end of a differential probe of the oscilloscope is connected with the CAN_H network bus, and the negative input end of the differential probe is connected with the CAN_L network bus.

As a preferable technical scheme, the sampling rate of any path of signal acquisition channel of the oscilloscope is not lower than 500MS/s.

As a preferable technical scheme, the CAN bus interferometer is a VH6501 interferometer.

As an preferable technical scheme, the CAN bus interferometer is used for simulating any one of the following bus faults:

the CAN_H network bus or the CAN_L network bus is short-circuited to a power supply.

The CAN_H network bus or the CAN_L network bus is shorted to ground.

The CAN_H network bus and the CAN_L network bus are shorted to each other.

The CAN_H network bus and the CAN_L network bus are reversely connected.

The capacitance and resistance parameters between the CAN_H network bus and the CAN_L network bus vary.

Compared with the prior art, the technical scheme of the utility model has the beneficial effects that: the utility model inputs faults of different types and intensity to the tested equipment by controlling the CAN bus interferometer through the upper computer, and simultaneously monitors and detects the communication state of the CAN bus by using the CAN bus analyzer, thereby being capable of rapidly finding out the faults of the CAN bus, verifying the reliability and stability of the tested equipment, greatly reducing the test time, greatly improving the test precision and efficiency and reducing the test cost. In addition, the CAN bus interferometer CAN be directly connected to the automobile through the CAN_H network bus and the CAN_L network bus, and the simulation interference is utilized to replace actual faults, so that fault testing under the actual automobile environment is realized, irreversible damage to the automobile bus is avoided, the testing result is more real and reliable, and the testing convenience is improved.

Drawings

Fig. 1 is a schematic structural diagram of a CAN bus fault injection test system according to an embodiment of the present application.

FIG. 2 is a flow chart of a power supply short circuit fault simulated CAN_H network bus and CAN_L network bus in an embodiment of the application.

Fig. 3 is a flow chart of simulating a reverse connection failure of a can_h network bus and a can_l network bus in an embodiment of the present application.

The system comprises a 1-CAN bus analyzer, a 2-CAN bus interferometer, 3-tested equipment, a 4-power supply, a 5-anti-signal reflection module, a 6-upper computer and a 7-oscilloscope.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The manner described in the following exemplary embodiments does not represent all manners consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the accompanying claims.

The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.

It should be understood that the terms "first," "second," and the like, as used in the specification and the claims herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. Unless otherwise indicated, the terms "front," "rear," "lower," and/or "upper" and the like are merely for convenience of description and are not limited to one location or one spatial orientation. The word "comprising" or "comprises", and the like, means that elements or items appearing before "comprising" or "comprising" are encompassed by the element or item recited after "comprising" or "comprising" and equivalents thereof, and that other elements or items are not excluded. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used in the description of the disclosure herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure.

Embodiments of the present application will be described in detail below with reference to the accompanying drawings. Features of the embodiments described below may be combined with each other without conflict.

The technical scheme of the utility model is further described below with reference to the accompanying drawings and examples.

Referring to fig. 1, an embodiment of the present application proposes a CAN bus fault injection test system, including: the device comprises a CAN bus analyzer 1, a CAN bus interferometer 2, tested equipment 3, a power supply 4, at least one anti-signal reflection module 5 and an upper computer 6; the power supply 4 is used for supplying power to the CAN bus analyzer 1, the CAN bus interferometer 2 and the tested device 3; the tested equipment 3 is connected into the CAN bus analyzer 1 and the CAN bus interferometer 2 through the CAN_H network bus and the CAN_L network bus; one end of the anti-signal reflection module 5 is connected with the CAN_H network bus, and the other end is connected with the CAN_L network bus; the upper computer 6 is in communication connection with the CAN bus interferometer 2.

In the specific implementation process, the equipment to be tested is connected to the system rack, the anti-signal reflection module 5 is reasonably configured according to the state of the equipment to be tested, then the CAN bus interferometer 2 is controlled by the upper computer 6 to inject faults into the equipment to be tested 3, and the CAN bus analyzer 1 is used for monitoring and detecting the communication state of the CAN bus and recording abnormal samples while the faults are injected. And verifying the reliability of the tested equipment 3 by analyzing the recorded abnormal samples, and adjusting corresponding fault injection parameters to inject faults of different types and intensities into the equipment to be tested until the fault injection test is completed.

In some embodiments, the device under test 3 is an automotive electronic controller or an automotive real vehicle.

In some embodiments, the CAN bus interferometer 2 is a VH6501 interferometer.

In some embodiments, the CAN bus jammer 2 is configured to simulate any one of the following bus faults:

(1) The CAN_H network bus or the CAN_L network bus is short-circuited to the power supply 4;

when the analog can_h network bus and the can_l network bus are shorted to the power supply 4, as shown in fig. 2, fig. 2 is a flowchart of an embodiment of the present application, which simulates a short circuit fault of the can_h network bus and the can_l network bus to the power supply, and specifically includes the following steps:

the tested equipment 3 is connected to a system rack, PIN9 and PIN3 of the public end of a CH1 channel of the CAN bus interferometer 2 are respectively connected with the positive pole and the negative pole of the power supply 4, and the anti-signal reflection module 5 is reasonably configured and then electrified.

The host computer 6 selects the mode to be Vbat and sets the resistance parameter to 0Ω by the canoecanoe11.0sp2 version.

And (3) using the CAPL language to control the CAN bus interferometer 2 to inject faults which cause the CAN_H network bus and the CAN_L network bus to short the anode of the power supply 4 into the tested device 3, and automatically analyzing and counting the test result.

The CAN bus analyzer 1 is used to observe whether CAN bus communication is normal or whether an error frame is generated.

And removing the injected CAN bus faults, and counting the time interval from the fault removal to the normal communication recovery of the bus.

Comparing the counted time interval for recovering normal communication with a preset evaluation standard, and if the evaluation index of the test standard is met, passing the test.

In this embodiment, when the CAN bus is unable to communicate, then the test passes.

(2) The CAN_H network bus and the CAN_L network bus are short-circuited to ground;

the method specifically comprises the following steps when the CAN_H network bus and the CAN_L network bus are simulated to be in short circuit to the ground:

the tested device 3 is connected to the system rack, the anti-signal reflection module 5 is reasonably configured, and then the power is supplied.

The CAN bus analyzer 1 is used to monitor whether bus communication is normal.

And the CAN bus jammer 2 is controlled by using the CAPL language to inject faults which cause the CAN_H network bus and the CAN_L network bus to short circuit the power supply 4 to the ground into the tested equipment 3, and the test results are automatically analyzed and counted.

And observing whether CAN bus communication is normal or not, and whether an error frame is generated or not.

In this embodiment, when the CAN bus CAN realize normal communication, but the cost performance is reduced, the test is passed.

(3) The CAN_H network bus and the CAN_L network bus are shorted to each other.

Exemplary, when the analog can_h network bus and the can_l network bus are shorted to each other, the method specifically includes the following steps:

The CAN bus analyzer 1 is used to monitor whether bus communication is normal.

And (3) using the CAPL language to control the CAN bus interferometer 2 to inject faults which cause the CAN_H network bus and the CAN_L network bus to be mutually short-circuited into the tested device 3, and automatically analyzing and counting the test result.

(4) The CAN_H network bus and the CAN_L network bus are reversely connected.

When the analog can_h network bus and the can_l network bus are connected in reverse, as shown in fig. 3, fig. 3 is a flowchart illustrating a reverse connection fault between the analog can_h network bus and the can_l network bus in the embodiment of the present application, and specifically includes the following steps:

the tested equipment 3 is connected to the system rack, the tested equipment 3 is connected to the mother head of the CH1 channel of the CAN bus interferometer 2, the anti-signal reflection module 5 is reasonably configured, and then the power is supplied.

And the CAN bus interferometer 2 is controlled by the CAPL language to inject faults which enable the CAN_H network bus and the CAN_L network bus to be reversely connected into the tested device 3, and the test results are automatically analyzed and counted.

In this embodiment, when the CAN bus cannot realize normal communication, the test passes.

The capacitance and resistance parameters between the 5CAN_H network bus and the CAN_L network bus vary.

Exemplary, the method simulates the capacitance and resistance parameter change between the CAN_H network bus and the CAN_L network bus, and specifically comprises the following steps:

The CAN bus analyzer 1 is used to monitor whether bus communication is normal.

And the CAN bus interferometer 2 is controlled by the CAPL language to inject faults which change the capacitance and resistance parameters between the CAN_H network bus and the CAN_L network bus into the tested device 3, and the test results are automatically analyzed and counted.

In this embodiment, when the CAN bus CAN normally communicate within a certain range, the test passes.

In some embodiments, when the device under test 3 is an actual vehicle, the testing steps are as follows:

directly accessing the CAN bus interferometer 2 into a real vehicle CAN bus;

the CAN bus analyzer 1 is used to monitor whether bus communication is normal.

And the CAN bus interferometer 2 is controlled by the CAPL language to inject the simulation interference of each CAN bus fault into the tested equipment 3, and the test result is automatically analyzed and counted.

In this embodiment, after the analog interference is removed, the CAN bus resumes normal communication immediately, and the recovery time satisfies the enterprise specification requirement, and the test passes.

In some embodiments, the automotive electronic controller is a type i automotive electronic controller or a type ii automotive electronic controller; a terminal resistor is not arranged in the CAN transceiver of the I-type automobile electronic controller; and the type II automobile electronic controller is internally provided with a terminal resistor. When the automobile electronic controller is an I-type automobile electronic controller, the test system is provided with two parallel anti-signal reflection modules 5; when the electronic controller is a type II electronic controller, one anti-signal reflection module 5 is configured.

In this embodiment, the use of the anti-signal reflection module 5can effectively eliminate signal reflection, and improve stability and accuracy of the system.

In some embodiments, the anti-signal reflection module 5 is a termination resistor.

In this embodiment, the resistance of the termination resistor is 120Ω.

In some embodiments, the test system further comprises an oscilloscope 7, wherein the positive input end of the differential probe of the oscilloscope 7 is connected with the can_h network bus, and the negative input end of the differential probe is connected with the can_l network bus. The sampling rate of any path of signal acquisition channel of the oscilloscope 7 is not lower than 500MS/s.

In this embodiment, the oscilloscope 7 supports the CAN signal decoding function, and CAN be used for CAN bus waveform measurement and analysis.

The same or similar reference numerals correspond to the same or similar components;

the terms describing the positional relationship in the drawings are merely illustrative, and are not to be construed as limiting the present patent;

it is to be understood that the above examples of the present utility model are provided by way of illustration only and not by way of limitation of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

1. A CAN bus fault injection test system, comprising: the system comprises a CAN bus analyzer (1), a CAN bus interferometer (2), a power supply (4), at least one anti-signal reflection module (5) and an upper computer (6);

the power supply (4) is used for supplying power to the CAN bus analyzer (1), the CAN bus interferometer (2) and the tested equipment (3);

the tested equipment (3) is connected into the CAN bus analyzer (1) and the CAN bus jammer (2) through the CAN_H network bus and the CAN_L network bus;

one end of the anti-signal reflection module (5) is connected with the CAN_H network bus, and the other end of the anti-signal reflection module is connected with the CAN_L network bus;

the upper computer (6) is in communication connection with the CAN bus interferometer (2).

2. The CAN bus fault injection test system according to claim 1, wherein the device under test (3) is an automotive electronic controller or an automotive real vehicle.

3. The CAN bus fault injection test system of claim 2, wherein the automotive electronic controller is a type i automotive electronic controller or a type ii automotive electronic controller; a terminal resistor is not arranged in the CAN transceiver of the I-type automobile electronic controller; and the type II automobile electronic controller is internally provided with a terminal resistor.

4. A CAN bus fault injection test system according to claim 3, characterized in that when the automotive electronic controller is a type i automotive electronic controller, the test system is provided with two anti-signal reflection modules (5) connected in parallel; when the automobile electronic controller is a type II automobile electronic controller, the test system is provided with an anti-signal reflection module (5).

5. CAN bus fault injection test system according to claim 1 or 4, characterized in that the anti-signal reflection module (5) is a termination resistor.

6. The CAN bus fault injection test system of claim 5, wherein the termination resistor has a resistance of 120 Ω.

7. The CAN bus fault injection test system of claim 1 further comprising an oscilloscope (7), wherein a positive input of a differential probe of the oscilloscope (7) is connected to the can_h network bus and a negative input of the differential probe is connected to the can_l network bus.

8. The CAN bus fault injection test system of claim 7, wherein a sampling rate of any path signal acquisition channel of the oscilloscope (7) is not lower than 500MS/s.

9. The CAN bus fault injection test system according to claim 1, wherein the CAN bus interferometer (2) is a VH6501 interferometer.

10. CAN bus fault injection test system according to claim 1 or 9, characterized in that the CAN bus interferometer (2) is adapted to simulate any one of the following bus faults:

the CAN_H network bus or the CAN_L network bus is short-circuited to the power supply (4);

the CAN_H network bus or the CAN_L network bus is short-circuited to ground;

the CAN_H network bus and the CAN_L network bus are mutually short-circuited;

the CAN_H network bus and the CAN_L network bus are reversely connected;