CN113419512A - Automatic ECU communication explicit-implicit voltage testing system and method - Google Patents

Abstract

The invention relates to the field of automatic testing, and provides an automatic ECU communication explicit-implicit voltage testing system and method, which comprises the following steps: the device comprises a PC (personal computer) end, a power supply unit, a bus analysis unit, a tested electronic unit, an acquisition oscilloscope and a resistance adjusting unit; the bus analysis unit is electrically connected with the PC terminal, the power supply unit and the acquisition oscilloscope through serial ports; the resistance adjusting unit is electrically connected with the bus analyzing unit, the collecting oscilloscope and the tested electronic unit through hard wires, and the tested electronic unit is electrically connected with the power supply unit through hard wires; the resistance adjustment unit includes: a first resistor, a second resistor and a switch. The system has the advantages of simple structure, high stability, strong reliability, simple and reliable test circuit, good compatibility, high automation degree, direct interface output of test results, intuition and the like; meanwhile, the testing method based on the system has the advantages of simple algorithm, strong redundancy, reasonable judgment, stable control function, stable and reliable result output and digital result display.

Description

Automatic ECU communication explicit-implicit voltage testing system and method

Technical Field

The invention relates to the field of automatic testing, in particular to an automatic ECU communication explicit-implicit voltage testing system and method.

Background

Along with the popularization and the popularity of new energy automobiles, more and more new energy automobiles CAN be released in the market, and because the communication modes of the mainstream automobiles are CAN communication at present, the test of a CAN communication network is particularly important, and the traditional test method of the modern automobiles comprises the following steps: the testing time is too long, the automation degree is not high, and the stability and the reliability are not high enough.

The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.

Disclosure of Invention

The invention mainly aims to solve the technical problems of overlong test time, low automation degree, and insufficient stability and reliability of the test method in the prior art.

In order to achieve the above object, the present invention provides an automatic ECU communication explicit-implicit voltage testing system, including: the device comprises a PC (personal computer) end, a power supply unit, a bus analysis unit, a tested electronic unit, an acquisition oscilloscope and a resistance adjusting unit;

the bus analysis unit is electrically connected with the PC end, the power supply unit and the acquisition oscilloscope through serial ports;

the resistance adjusting unit is electrically connected with the bus analyzing unit, the collecting oscilloscope and the tested electronic unit through hard wires, and the tested electronic unit is electrically connected with the power supply unit through hard wires;

the resistance adjustment unit includes: a first resistor, a second resistor and a switch.

Preferably, the resistance adjusting unit is electrically connected with the bus analyzing unit, the collecting oscilloscope and the electronic unit to be tested through hard wires, specifically:

the interface 33 of the bus analysis unit is electrically connected with one end of the first resistor, the interface 51 of the acquisition oscilloscope, one end of the switch and the interface 42 of the electronic unit to be tested, and the other end of the switch is electrically connected with one end of the second resistor;

and the 32 interface of the bus analysis unit is electrically connected with the other end of the first resistor, the 52 interface of the acquisition oscilloscope, the other end of the second resistor and the 43 interface of the tested electronic unit.

An automatic ECU communication explicit-implicit voltage testing method is realized based on the automatic ECU communication explicit-implicit voltage testing system, and comprises the following steps:

s1: the PC end starts the automatic ECU communication explicit-implicit voltage testing system to perform self-checking before testing, and if the self-checking result before testing is passed, the step S2 is executed; otherwise, judging that the self-checking result before the test is failed, closing the automatic ECU communication explicit-implicit voltage test system, and returning to the step S1;

s2: the bus analysis unit acquires the CAN signal of the tested electronic unit through the acquisition oscilloscope to obtain a visible and invisible high voltage V_{CAN_H}Low voltage V with harmony and invisibility_{CAN_L}；

S3: the acquisition oscilloscope displays a recessive high voltage V_{CAN_H}And the apparent and recessive low voltage V_{CAN_L}Calculating to obtain a differential voltage V_DiffAnd a common mode voltage V_Com；

S4: recessing the display to a high voltage V_{CAN_H}The display-recessive low voltage V_{CAN_L}The differential voltage V_DiffAnd said common mode voltage V_ComRepeating the steps S2 to S3 n times as a group of test data to obtain n groups of test data, and inputting each group of test data into the PC terminal for test analysis to obtain a test result.

Preferably, in step S1, the pre-test self-test specifically includes:

s11: the power supply unit inputs 13.5V voltage to the electronic unit to be detected;

s12: the PC end detects whether the electronic unit to be detected contains a terminal resistor, and if yes, the switch is controlled to be closed through the bus analysis unit; otherwise, controlling the switch to be switched off through the bus analysis unit;

s13: after waiting for a preset time t, the bus analysis unit detects the communication state of the electronic unit to be detected; if the tested electronic unit CAN stably output the CAN signal, judging that the self-checking result before the test is passed; otherwise, judging that the self-checking result before the test is failed.

Preferably, in step S3, the differential voltage V_DiffThe calculation formula of (2) is as follows:

V_Diff＝V_{CAN_H}-V_{CAN_L}

the common mode voltage V_ComThe calculation formula of (2) is as follows:

V_Com＝V_{CAN_H}+V_{CAN_L}。

preferably, in step S4, the inputting each of the test data into the PC terminal for test analysis to obtain a test result, specifically:

s41: the PC terminal sets the display recessive high voltage V according to the test requirement_{CAN_H}Threshold range of (3), the apparent and recessive low voltage V_{CAN_L}Threshold range of (3), the differential voltage V_DiffAnd the common mode voltage V_ComA threshold range;

s42: if the apparent and recessive high voltage V_{CAN_H}The display-recessive low voltage V_{CAN_L}The differential voltage V_DiffAnd said common mode voltage V_ComIf the test results are all within the corresponding threshold value range, judging that the test result is passed; otherwise, judging that the test result is failed.

The invention has the following beneficial effects:

the system has the advantages of simple structure, high stability, strong reliability, simple and reliable test circuit, good compatibility, high automation degree, direct interface output of test results, intuition and the like; meanwhile, the testing method based on the system has the advantages of simple algorithm, strong redundancy, reasonable judgment, stable control function, stable and reliable result output and digital result display.

Drawings

FIG. 1 is a system block diagram of an embodiment of the present invention;

FIG. 2 is a flow chart of a method according to an embodiment of the present invention;

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, the present invention provides an automated ECU communication visibility voltage test system, including: the device comprises a PC (personal computer) end 1, a power supply unit 2, a bus analysis unit 3, a tested electronic unit 4, an acquisition oscilloscope 5 and a resistance adjusting unit;

the bus analysis unit 3 is electrically connected with the PC terminal 1, the power supply unit 2 and the acquisition oscilloscope 5 through serial ports;

the resistance adjusting unit is electrically connected with the bus analyzing unit 3, the collecting oscilloscope 5 and the tested electronic unit 4 through hard wires, and the tested electronic unit 4 is electrically connected with the power supply unit 2 through hard wires;

the resistance adjustment unit includes: a first resistor 6, a second resistor 7 and a switch 8;

in a specific implementation, the switch 8 is an external terminal leading-in switch, the first resistor 6 is a designed terminal resistor, the second resistor 7 is an external leading-in terminal resistor, and the resistance values of the first resistor 6 and the second resistor 7 are both 120 ohms;

ports 32 and 33 of the bus analysis unit 3 are sampling ports, and are used for acquiring communication information of the tested electronic unit 4 and judging whether the current communication of the tested electronic unit 4 is normal; the 34, 31 and 35 ports of the bus analysis unit 3 are serial ports, the 34 port of the bus analysis unit 3 is communicated with the 22 port of the power supply unit 2 through a serial port, the 31 port of the bus analysis unit 3 is communicated with the PC end 1 through a serial port, and the 35 port of the bus analysis unit 3 is communicated with the 53 port of the acquisition oscilloscope 5 through a serial port;

the ports 51 and 52 of the collecting oscilloscope 5 are collecting ports for collecting the high voltage V with the invisibility of the electronic unit 4 to be measured_{CAN_H}Low voltage V with harmony and invisibility_{CAN_L}And calculating to obtain a differential voltage V by collecting a calculation module in the oscilloscope 5_DiffAnd a common mode voltage V_Com。

In this embodiment, the resistance adjusting unit is electrically connected to the bus analyzing unit 3, the collecting oscilloscope 5 and the electronic unit to be tested 4 through hard wires, specifically:

the interface 33 of the bus analysis unit 3 is electrically connected with one end of the first resistor 6, the interface 51 of the acquisition oscilloscope 5, one end of the switch 8 and the interface 42 of the electronic unit 4 to be tested, and the other end of the switch 8 is electrically connected with one end of the second resistor 7;

the interface 32 of the bus analysis unit 3 is electrically connected with the other end of the first resistor 6, the interface 52 of the acquisition oscilloscope 5, the other end of the second resistor 7 and the interface 43 of the electronic unit 4 to be tested.

Referring to fig. 2, the present invention provides an automated ECU communication explicit and implicit voltage testing method, which is implemented based on the automated ECU communication explicit and implicit voltage testing system, and includes the steps of:

s1: the PC terminal 1 starts the automatic ECU communication explicit-implicit voltage testing system to perform self-checking before testing, and if the self-checking result before testing is passed, the step S2 is executed; otherwise, judging that the self-checking result before the test is failed, closing the automatic ECU communication explicit-implicit voltage test system, and returning to the step S1;

s2: the bus analysis unit 3 acquires the CAN signal of the tested electronic unit 4 through the acquisition oscilloscope 5 to obtain the apparent and hidden high voltage V_{CAN_H}Low voltage V with harmony and invisibility_{CAN_L}；

S3: the acquisition oscilloscope 5 passes the display recessive high voltage V_{CAN_H}And the apparent and recessive low voltage V_{CAN_L}Calculating to obtain a differential voltage V_DiffAnd a common mode voltage V_Com；

S4: recessing the display to a high voltage V_{CAN_H}The display-recessive low voltage V_{CAN_L}The differential voltage V_DiffAnd said common mode voltage V_ComRepeating the steps S2 to S3 n times as a set of test data to obtain n sets of the test data, and inputting each set of the test data to the PC terminal 1 for test analysis to obtain a test result.

In this embodiment, in step S1, the self-test before the test specifically includes:

s11: the power supply unit 2 inputs 13.5V voltage to the electronic unit 4 to be tested;

s12: the PC end 1 detects whether the electronic unit 4 to be detected contains a terminal resistor, and if yes, the switch 8 is controlled to be closed through the bus analysis unit 3; otherwise, the switch 8 is controlled to be switched off by the bus analysis unit 3;

s13: after waiting for a preset time t, the bus analysis unit 3 detects the communication state of the tested electronic unit 4; if the tested electronic unit 4 CAN stably output the CAN signal, judging that the self-checking result before the test is passed; otherwise, judging that the self-checking result before the test is failed; in a specific implementation, the preset time t is set to 5S.

In this embodiment, in step S3, the differential voltage V_DiffThe calculation formula of (2) is as follows:

V_Diff＝V_{CAN_H}-V_{CAN_L}

the common mode voltage V_ComThe calculation formula of (2) is as follows:

V_Com＝V_{CAN_H}+V_{CAN_L}。

in this embodiment, in step S4, the inputting of each test data into the PC terminal 1 for test analysis to obtain a test result specifically includes:

s41: the PC terminal 1 sets the display recessive high voltage V according to the test requirement_{CAN_H}Threshold range of (3), the apparent and recessive low voltage V_{CAN_L}Threshold range of (3), the differential voltage V_DiffAnd the common mode voltage V_ComA threshold range;

in specific implementation, each threshold range is specifically set according to the model of the tested electronic device in the tested electronic unit 4;

s42: if the apparent and recessive high voltage V_{CAN_H}The display-recessive low voltage V_{CAN_L}The differential voltage V_DiffAnd said common mode voltage V_ComIf the test results are all within the corresponding threshold value range, judging that the test result is passed; otherwise, judging that the test result is failed;

in the concrete implementation, the high voltage V with the visibility and the invisibility_{CAN_H}Low voltage V with visibility and invisibility_{CAN_L}Differential voltage V_DiffAnd a common mode voltage V_ComThe values of (2) and the test results are displayed on the PC side 1.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third and the like do not denote any order, but rather the words first, second and the like may be interpreted as indicating any order.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (6)

1. An automatic ECU communication invisibility voltage test system which is characterized by comprising: the device comprises a PC (personal computer) end (1), a power supply unit (2), a bus analysis unit (3), an electronic unit to be tested (4), an acquisition oscilloscope (5) and a resistance regulation unit;

the bus analysis unit (3) is electrically connected with the PC end (1), the power supply unit (2) and the acquisition oscilloscope (5) through serial ports;

the resistance adjusting unit is electrically connected with the bus analyzing unit (3), the acquisition oscilloscope (5) and the electronic unit to be tested (4) through hard wires, and the electronic unit to be tested (4) is electrically connected with the power supply unit (2) through hard wires;

the resistance adjustment unit includes: a first resistor (6), a second resistor (7) and a switch (8).

2. The automatic ECU communication saliency voltage test system of claim 1, characterized in that the resistance adjustment unit is electrically connected with the bus analysis unit (3), the acquisition oscilloscope (5) and the tested electronic unit (4) through hard wires, specifically:

the interface 33 of the bus analysis unit (3) is electrically connected with one end of the first resistor (6), the interface 51 of the acquisition oscilloscope (5), one end of the switch (8) and the interface 42 of the tested electronic unit (4), and the other end of the switch (8) is electrically connected with one end of the second resistor (7);

and the 32 interface of the bus analysis unit (3) is electrically connected with the other end of the first resistor (6), the 52 interface of the acquisition oscilloscope (5), the other end of the second resistor (7) and the 43 interface of the tested electronic unit (4).

3. An automatic ECU communication explicit-implicit voltage testing method is realized based on the automatic ECU communication explicit-implicit voltage testing system according to any one of claims 1-2, and is characterized by comprising the following steps:

s1: the PC end (1) starts the automatic ECU communication explicit-implicit voltage test system to perform self-checking before testing, and if the self-checking result before testing is passed, the step S2 is carried out; otherwise, judging that the self-checking result before the test is failed, closing the automatic ECU communication explicit-implicit voltage test system, and returning to the step S1;

s2: the bus analysis unit (3) acquires the CAN signal of the electronic unit (4) to be detected through the acquisition oscilloscope (5) to obtain a visible and invisible high voltage V_{CAN_H}Low voltage V with harmony and invisibility_{CAN_L}；

S3: the acquisition oscilloscope (5) displays a recessive high voltage V_{CAN_H}And the apparent and recessive low voltage V_{CAN_L}Calculating to obtain a differential voltage V_DiffAnd a common mode voltage V_Com；

S4: recessing the display to a high voltage V_{CAN_H}The display-recessive low voltage V_{CAN_L}The differential voltage V_DiffAnd said common mode voltage V_ComRepeating the steps S2 to S3 n times as a group of test data to obtain n groups of test data, and inputting each group of test data into the PC terminal (1) for test analysis to obtain a test result.

4. The automated ECU communication explicit-implicit voltage testing method according to claim 3, wherein in the step S1, the pre-test self-test is specifically as follows:

s11: the power supply unit (2) inputs 13.5V voltage to the electronic unit (4) to be detected;

s12: the PC end (1) detects whether the electronic unit (4) to be detected contains a terminal resistor, if yes, the switch (8) is controlled to be closed through the bus analysis unit (3); otherwise, controlling the switch (8) to be switched off through the bus analysis unit (3);

s13: after waiting for a preset time t, the bus analysis unit (3) detects the communication state of the electronic unit (4) to be detected; if the tested electronic unit (4) CAN stably output the CAN signal, judging that the self-checking result before the test is passed; otherwise, judging that the self-checking result before the test is failed.

5. The automated ECU communication explicit-implicit voltage test method according to claim 3, wherein in step S3, the differential voltage V_DiffThe calculation formula of (2) is as follows:

V_Diff＝V_{CAN_H}-V_{CAN_L}

the common mode voltage V_ComThe calculation formula of (2) is as follows:

V_Com＝V_{CAN_H}+V_{CAN_L}。

6. the automated ECU communication explicit-implicit voltage testing method according to claim 3, wherein in step S4, the test data are input into the PC terminal (1) for test analysis to obtain a test result, specifically:

s41: the PC terminal (1) is tested according to the testDemand setting the display recessive high voltage V_{CAN_H}Threshold range of (3), the apparent and recessive low voltage V_{CAN_L}Threshold range of (3), the differential voltage V_DiffAnd the common mode voltage V_ComA threshold range;

s42: if the apparent and recessive high voltage V_{CAN_H}The display-recessive low voltage V_{CAN_L}The differential voltage V_DiffAnd said common mode voltage V_ComIf the test results are all within the corresponding threshold value range, judging that the test result is passed; otherwise, judging that the test result is failed.

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