KR101990470B1 - Can fd test board and can network test system using the same - Google Patents

Abstract

The present invention relates to a control area network (CAN) flexible data rate (FD) test board to provide a power state of a vehicle and various test conditions to a test target for testing CAN characteristics, and a CAN test system using the same. According to the present invention, the CAN network test system comprises: CAN communication equipment performing CAN communications in accordance with control; a CAN FD test board testing a CAN communication function of a sample to be tested in accordance with control; a variable power means providing main power, external power, and offset to the sample to be tested; an LCR meter measuring an LCR value of the sample, the board, and an equipment side; a parameter-variable board providing variable resistance and capacitance values to the CAN FD test board; and a test controller controlling the CAN communication equipment while performing a loaded test procedure to communicate with the sample to be tested in a CAN mode, and controlling the CAN FD test board, the variable power means, the LCR meter, and a parameter-variable board to process an entire test. Accordingly, all possible situations occurring in a vehicle are reproduced, thereby providing effects of checking whether CAN communications are failed in which cases and preventing a failure in the CAN communications.

Description

[0001] The present invention relates to a CAN FD test board and a CAN network test system using the CAN FD test board.

The present invention relates to an apparatus for testing a CAN (Controller Area Network) network used in automobile communication, and more particularly, to a CAN FD communication test board and a CAN network test system using the same.

In general, a CAN (Local Interconnect Network), a CAN (Controller Area Network), and a FlexRay are used for communication between an ECU and a sensor in a vehicle. CAN is widely used in terms of speed, cost, and stability. The CAN communication method uses the CAN 2.0A standard (standard CAN) which operates with a maximum speed of 250K and the CAN 2.0B standard (Full CAN) which operates with a maximum speed of 1M with the ID of 29 bits. The data length is extended from 8 bytes to 64 bytes and the CAN data rate (Flexible Data rate) is used. In general, the CAN message packet consists of SOF, Message ID, Control (EDL, DLC), Data, CRC, ACK and EOF. Control of the CAN FD is made up of Extended Data Length (EDL), Bit Rate Switch (BRS), Error State Indicator (ESI), and Data Length Code (DLC).

Parts of the CAN communication function used in a vehicle need to test the CAN network function during R & D or production. For a more accurate test, it is necessary to test how the component under test operates in various environments of a real vehicle. In order to test the CAN network operating characteristics of the test subject in this way, a test facility that provides an actual vehicle environment is required.

That is, CAN is a data bus using two wires, which is mainly used for data transmission between an ECU (Electronic Control Unit) and an ECU, in which a plurality of nodes are connected, Communication may not be performed properly depending on the length, and a voltage drop due to the line length also occurs. In addition, CAN has many nodes according to the multi master communication method, and the resistance and capacitance (CAP) component according to the length of the line, the offset, short-circuit, short GND, Etc. may result in communication errors. Therefore, there is a need for an apparatus that can reproduce and test parts that can be issued by the actual CAN communication.

An in-vehicle can communication simulating apparatus using a starting switch mapped with a vehicle state, disclosed in Japanese Laid-Open Patent Publication No. 10-2017-0050247, is provided with an ignition switch through a program installed in a user terminal, (CAN) signal for the vehicle state (OFF / ACC / RUN / Crank) is mapped to the CAN signal for each vehicle state (OFF / ACC / RUN / Crank) according to the operation of the ignition switch. Signal to the in-vehicle network to develop and test devices that use the can signal.

However, such conventional CAN communication test apparatuses mainly generate and provide CAN signals for testing mainly in software, and can not provide the actual operating environment of the vehicle.

KR 10-1472584 B1 KR 10-1552714 B1

It is an object of the present invention to provide a CAN FD communication test board capable of providing a power status of a vehicle and various test conditions to a test object for testing a CAN network characteristic, And to provide a CAN network test system.

According to an aspect of the present invention, there is provided a system including: a CAN communication device that performs CAN communication according to control; A CAN FD test board for testing the CAN communication function of the test object under control; Variable power supply means for providing a main power source, an external power source, and an offset to the test sample; An LCR meter for measuring the LCR value of the sample, board, or equipment; A parameter variable board for supplying a variable resistance value and a variable capacitance value to the CAN FD test board; And the CAN communication device is controlled while carrying out the mounted test procedure to communicate with the object to be tested in a CAN method, and the CAN FD test board, the variable power source, the LCR meter, and the variable variable board are controlled to process the entire test And a test controller.

Wherein the CAN FD test board comprises a power control unit for providing a power-related condition of a test sample and a CAN conditioning unit for testing a CAN communication characteristic of the test sample, and the CAN conditioning unit is connected to the test sample side A waveform measuring unit for turning on / off the connection with the waveform measuring instrument, an LCR measuring unit for turning on and off the connection with the LCR meter, and an on / off switch for connecting / disconnecting the board and the sample. A line termination section for testing a line short, a terminating resistance section for setting a CAN termination resistance for high-speed CAN communication, and a variable resistance and a variable capacitance to change the characteristics of the CAN line A CAN line test section for testing, an external power test section for testing when an external power source is connected to the CAN line, and a PWM waveform for testing the characteristics of the CAN line , A line length change test part for testing by changing the length of the CANH / CANL line, and a third cut-off part for turning on / off the connection to the equipment side. It is possible to reproduce a combination of conditions that can be achieved.

The power control unit includes a relay for connecting the vehicle power source to the VBAT terminal of the test sample, a relay for connecting the vehicle power source to the ACC terminal of the test sample, a relay for connecting the vehicle power to the IGN terminal of the test sample, , A relay for connecting vehicle power to the GND terminal of the sample to be tested, a relay for selecting SMU + power or PowerIN-, a relay for selecting PowerIN + or PowerIN-, And logic elements for generating a control signal.

According to the present invention, it is possible to reproduce all the situations that may occur inside the automobile, thereby confirming in some cases the communication problem in the CAN network. In other words, the CAN communication equipment and CAN FD communication test board can be used to reproduce various numbers of occurrences in the automobile to confirm that the CAN communication works well. There is an effect that the obstacle can be prevented in advance.

FIG. 1 is a block diagram of an overall configuration of a CAN network test system according to an embodiment of the present invention;
2 is a block diagram of a power control unit of a CAN FD test board according to an embodiment of the present invention,
FIGS. 3A and 3B are block diagrams of a CAN conditioning unit of a CAN FD test board according to an embodiment of the present invention;
4 is a flowchart of a CAN basic communication test procedure according to an embodiment of the present invention,
FIG. 5 is a flow chart of an LCR value measurement in an object ECU according to an embodiment of the present invention. FIG.
FIG. 6 is a flowchart of LCR value measurement inside a test board according to an embodiment of the present invention. FIG.
7 is a flowchart of a communication apparatus LCR value measurement according to an embodiment of the present invention.
8 is a ground offset test flow chart according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings. The following examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention.

1 is a block diagram of an entire configuration of a CAN network test system according to an embodiment of the present invention.

1, the test system of the present invention includes a test object 10, a test controller 20 for controlling the entire test operation, a CAN (CAN) that performs CAN communication under the control of the test controller 20, A CAN FD test board 100 for testing CAN communication under the control of the communication device 30 and the test controller 20, a first programmable power 40 for providing main power to the test object 10, A variable power (SMU) 50 for providing offset power to the test sample, a second programmable power 60 for providing external power to the test sample 10, a sample or board, and an LCR value of the equipment side And a parameter variable board 80 for supplying a variable resistance value and a variable capacitance value to the CAN FD test board 100.

Referring to FIG. 1, a test object 10 is a part mounted on a vehicle having a CAN communication function, and can be connected to a CAN FD test board 110 according to an embodiment of the present invention to test various CAN communication functions have.

The test controller 20 is equipped with various test programs according to the present invention. The test controller 20 is connected to the test object 10 via the CAN communication device 30 via the CAN bus (CANH, CANL) to perform CAN communication, The FD test board 100, the programmable powers 40 and 60, the variable power 50, the LCR meter 70, and the variable variable board 80 to process the entire test.

The CAN communication device 30 communicates with the test object 10 via the CAN FD test board 100 under the control of the test controller 20 in the CAN FD method and controls the programmable powers 40 and 60 and the variable power 50 supply variable power to the CAN FD test board 100 under the control of the test controller 20.

The LCR meter 70 measures the LCR (inductance, capacitance, resistance) values of the test object 10, the CAN FD test board 100 itself, and the CAN communication equipment 30 connected via the CAN FD test board 100 .

The parameter varying unit 80 provides the variable resistance value and the variable capacitance value to the CAN FD test board 100 under the control of the test controller 20. [

The CAN FD test board 100 includes a power control unit 110 and a CAN conditioning unit 120 and tests the power supply characteristics and the CAN operation characteristics of the test object 10 under the control of the test controller 20.

2 is a block diagram of a power control unit of a CAN FD test board according to an embodiment of the present invention.

2, a power control part 110 includes a relay PRLY1 for connecting a vehicle power source to a VBAT terminal of a test sample 10, A relay PRLY2 for connecting a vehicle power source to the IGN terminal of the test object 10 and a relay PRLY4 for connecting a vehicle power source to the GND terminal of the test object 10, , Relay (PRLY5) for selecting SMU + power or PowerIN-, relay (PRLY6) for selecting SMU + power or PowerIN +, relay (PRLY7) for selecting PowerIN + or PowerIN-, manual switch (VBATSW1 to VBATSW4) And logic elements U1 to U4 for generating control signals CTR1 to CTR4 according to the signals of the switches S / W P1 to S / W P4 so that power is basically operated in an automobile or other CAN communication equipment You can simulate what you can do, and Reproduce the disconnection or power Offset and reverse voltage state will be able to test the CAN operate in a variety of power conditions.

As described above, the power control unit 110 is for testing how the CAN communication responds in various states. The power control unit 110 can be controlled in a programmable manner, and a manual switch can be installed to turn on / Off. That is, the VBAT, ACC, IGN, and GND of the test object 10 can be controlled manually or by software (S / W), and the offset test and the voltage reversal test can also be tested using the SMU 50.

The power control unit 1110 may operate in an operation mode as shown in Table 1 below.

mode PRLY1 PRLY2 PRLY3 PRLY4 PRLY5 PRLLY6 PRLY7 basic On Off Off On Off Off Off ACC On On Off On Off Off Off IGN On On On On Off Off Off Single-line mode On / Off On / Off On / Off On / Off Off Off Off power
offset On - - On On Off Off VBAT
Voltage drop and rise On - - On Off On Off GND short On On / Off On / Off On Off On On

Referring to Table 1, in the basic mode, problems that may occur in the first relay (PRLY1) and the fourth relay (PRLY4) vehicle can be combined and reproduced. Therefore, according to the embodiment of the present invention, waveforms can be measured using an oscilloscope or a data acquisition device (DAQ), and values of resistors, inductors, and capacitors can be read using an external LCR meter 70.

The disconnection sections 121, 124 and 136 according to the embodiment of the present invention are composed of first to third disconnection sections 121, 124 and 136 as shown in the following Table 2, and divide the sections into three sections for measurement.

division Primary cut- Secondary disconnection part Tertiary disconnection part relay RLYa1, RLYb1 RLYa2, RLYb2 RLYa14, RLYb16 Sample measurement On Off - Board measurement Off On Off Equipment measurement Off On On

As shown in Table 2, in order to measure the characteristics of the sample 10 to be tested, the relay of the primary disconnecting unit 121 is turned on and the relay of the secondary disconnecting unit 124 is turned off, The relay of the primary disconnected part and the relay of the tertiary disconnected part are turned off and only the relay of the secondary disconnected part is turned on. In order to measure the characteristics of the communication equipment 30, the relay of the primary disconnecting unit 121 is turned off and the relay of the secondary disconnecting unit 124 and the third disconnecting unit 136 are turned on.

The waveform measuring unit 122 includes relays RLYa3 and RLYb3 for connecting or disconnecting the external oscilloscope and relays RLYa4 and RLYb4 for connecting or disconnecting the data collecting unit DAQ to and from the sample 10 or board 100 and the equipment 30 can be measured.

The LCR measuring unit 123 includes relays RLYa5, RLYb5, RLYb6 and RLYb7 for connecting or disconnecting the LCR meter 70 to measure LCR characteristics of the sample 10, the board 100, .

The line short test section 125 is a relay (RLYk1) for short-circuiting CANH and CANL lines, which are CAN lines (signal lines and buses), for testing short-time operation characteristics of CAN lines.

The termination resistance testing unit 126 is composed of relays (RLYa6, RLYb8) for connecting a terminating resistor to the CANH and CANL lines to test the terminating resistor option function for high-speed CAN communication.

The CAN line variable resistance testing unit 127 is implemented as relays (RLYa7, RLYa8, RLYb9, RLYb10) for connecting or disconnecting the first to third variable resistance modules to test the characteristics when the resistance of the CAN line is varied . That is, the CAN line variable resistance testing unit 127 can use the variable resistance module to verify the CAN communication operation by simulating the change in the resistance component of the CAN line (CANH, CANL) by the VBAT or GND line due to the wire covering or the length Let's do it.

The CAN line variable capacity testing unit 128 is implemented as relays (RLYa9, RLYa12, RLYb11, RLYb14) for connecting or disconnecting the first to third variable capacity modules to test the characteristics when the capacitance component of the CAN line is variable . That is, the CAN line variable capacity testing unit 128 can check the CAN communication operation using a variable capacity (CAP) module, when the VBAT or GND line on the CAN line (CANH, CANL) has a CAP component, You can see what problems are occurring by changing the capacity (CAP) value. In the same way, you can see how the intermediate capacitance (CAP) component can affect when CANH and CANL are shorted together.

The ground short test section 129 includes a relay RLYa11 for grounding the CANH line through the resistor R9 and a relay RLYb13 for grounding the CANL line through the resistor R9 so that the CAN line is grounded So as to test the characteristics in the case of short-circuiting. CANH and CANL, respectively. At the same time, CANH and CANL can be short-circuited by a resistor (R9).

The external power supply testing unit 130 includes a relay RLYk2 for connecting the external power supply 60 to the CAN line through the variable resistor module, a relay RLYa10 for connecting the external power supply to the CANH line, It is possible to test the characteristics of the relay (RLYb12) to connect the external power supply to the CANH line or CANL line.

The external signal testing unit 131 includes a relay RLYa15 for connecting the external PWM to the CAN line through the diode D1 and a relay RLYa10 for connecting the external PWM to the CANH line, (RLYb12) to test the characteristics of an external PWM connected to a CANH line or a CANL line.

The CAN line length test sections 132a and 132b include relays RLYc5 and RLYc7 for extending the CANH line and relays RLYc6 and RLYc6 for extending the CANL line to test the operation characteristics according to the change in the length of the CAN line .

The CAN line power short test units 133a and 133b include a relay RLYc8 for connecting the CANH line to GND or VBAT and a relay RLYc10 for connecting the CANL line to the GND or VBAT, This makes it possible to test the characteristics in the case of shorting.

The CAN line voltage regulation test sections 134 and 135 include a relay RLYa13 for connecting the CANH line to the SMU + power supply line and a relay RLYb15 for connecting the CANL line to the SMU power supply line. To be tested.

4 is a CAN basic communication test flow chart for testing whether the CAN communication is well performed in the starting state (IGN mode) according to the embodiment of the present invention

Referring to FIG. 4, the test controller 20 determines whether there is communication in the initial state after the system is started. If there is communication, the test controller 20 operates the power control unit 110 in the IGN mode to start the system, All of the relays connecting the CAN FD test board 100 and the test object 10 are connected (S101 to S104). If the communication is not normally performed, a report is made after the error determination (S105 to S107).

FIG. 5 is a flow chart for measuring the LCR value existing in the test sample according to the embodiment of the present invention, FIG. 6 is a flowchart for measuring the LCR value inside the test board according to the embodiment of the present invention, In which the LCR value is measured by the CAN communication device.

Referring to FIG. 5, the test controller 20 determines whether there is a communication test in the initial state after the system starts. If the communication test is the LCR value measurement of the sample, the power control unit 110 turns off the basic power mode, The LCR value of the sample is measured by connecting the sample 10 and the LCR meter 70 by turning on the primary disconnecting unit 121 and turning off the secondary disconnecting unit 124 in the conditioning unit 120, , A report is generated when an error occurs in the test, and the process is terminated when the measurement is normally completed (S201 to S206).

Referring to FIG. 6, the test controller 20 determines whether there is a communication test in the initial state after the system starts. If the communication test is the LCR value measurement of the CAN FD test board 100, the power control unit 110 sets the basic power mode The CAN conditioning unit 120 turns off the primary disconnecting unit 121 and turns on the secondary disconnecting unit 124 and turns off the tertiary disconnecting unit to connect the board 100 and the LCR meter 70 After the LCR value of the board is measured, the data is stored. If an error occurs during the test, a report is made and if the measurement is normally completed, the process is terminated (S301 to S306).

Referring to FIG. 7, the test controller 20 determines whether there is a communication test in the initial state after the system is started. If the LCR value of the communication communication device 30 is measured, the power control unit 110 turns off the basic power mode , The CAN conditioning unit 120 turns off the primary disconnecting unit 121 and turns on the secondary disconnecting unit 124 and the tertiary disconnection unit 136 to connect the communication equipment 30 and the LCR meter 70 After the LCR value of the equipment is measured, the data is stored. If an error occurs in the test, a report is made and if the measurement is normally completed, the process ends (S401 to S406).

8 is a ground offset test flow chart according to an embodiment of the present invention, in which the CAN communication state is tested when the GND of the ECU rises or falls.

Referring to FIG. 8, the test controller 20 determines whether there is a communication test in the initial state after the system starts. If the test is the ground offset test, the power control unit 110 turns off the basic power mode, The offset voltage value is varied. After that, it is determined whether or not there is communication and the data is loaded. If the test is successful, it is determined that the test is successful. If the test is successful, the process is terminated and a report upon error is made (S501 to S507).

In the dominant threshold change test according to the embodiment of the present invention, when an offset voltage is generated in a communication line, a communication voltage is changed. When an offset occurs under a certain voltage, a communication is disabled. Therefore, in the test procedure of the present invention, the voltage to be communicated is reduced to check whether communication is successful.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

10: Test sample 20: Test controller
30: CAN communication equipment 40,60: Programmable power
50: variable power 70: LCR meter
80: Parameter variable board 100: CAN FD test board
110: power control unit 120: CAN conditioning unit
121: Primary disconnecting unit 122: Waveform measuring unit
123: LCR measuring unit 124: secondary disconnecting unit
125: Line short section 126: Termination resistance section
127: variable resistor part 128: variable capacitor part
129: ground short test part 130: external power application test part
131: PWM waveform application test section 132a, 132b: Line length extension test section
133a, 133b: VBat, GND short test section 134, 135: line voltage variable test section
136: Third breaking section

Claims (5)

And a CAN FD test board for testing the CAN communication function of the test object under control according to the control and a variable FD to provide the main power source, A LCR meter for measuring the LCR value of the sample, the board, and the equipment side; a parameter variable board for supplying the variable resistance value and the variable capacitance value to the CAN FD test board; A CAN controller including a test controller for controlling the CAN communication equipment to communicate with the test object in CAN mode and to process the entire test by controlling the CAN FD test board, the variable power supply, the LCR meter, In a test system,
The CAN FD test board
A power control unit for providing power supply related conditions of the test sample and a CAN conditioning unit for testing the CAN communication characteristics of the test sample,
The power control unit
A relay for connecting the vehicle power source to the VBAT terminal of the test sample,
A relay for connecting the vehicle power source to the ACC terminal of the sample to be tested,
A relay for connecting the vehicle power source to the IGN terminal of the test sample,
A relay for connecting the vehicle power source to the GND terminal of the test sample,
A relay for selecting SMU + power or PowerIN-,
A relay for selecting PowerIN + or PowerIN-,
And logic elements for generating a control signal according to a signal of a manual switch or a software switch, so as to provide various power conditions such as a disconnection that may occur in an actual vehicle, a power offset and a reverse voltage state,
The CAN conditioning unit
A primary breaker for turning on / off the connection with the sample side to be tested,
A waveform measuring unit for turning on / off the connection with the waveform measuring instrument,
An LCR measurement unit for on / off connection with the LCR meter,
A secondary disconnecting part for on / off connection of the board and the sample,
A line short portion for testing a line short, a terminal resistance portion for setting a CAN termination resistance for high-speed CAN communication,
A CAN line test section for testing the characteristics of the CAN line using a variable resistor and a variable capacitance,
An external power test section for testing when external power is connected to the CAN line,
An external waveform test unit for testing the characteristics of the CAN line using the PWM waveform,
A line length change test section for testing by changing the length of the CANH / CANL line,
Including the third disconnecting part to turn on / off the connection with the equipment side
In the case of CAN communication,
In order to measure the characteristics of the test sample, the relay of the primary disconnected part is turned on and the relay of the secondary disconnected part is turned off,
In order to measure the characteristics of the CAN FD test board, the relay of the primary disconnected part and the relay of the third disconnected part are turned off and only the relay of the secondary disconnected part is turned on,
Characterized in that the relay of the primary disconnected part is turned off and the relay of the secondary disconnected part and the tertiary disconnected part are turned on in order to measure the characteristics of the communication equipment, CAN network test system using FD test board. delete delete delete delete

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