Canoe: what is vtsystem

Reference link ：

1. VT System card ： ECU test bench-VT system - Shanghai PoleLink Information Technology
2. VT System Board receiving ： VT-System—ECU Function test module - Germany Vector- Bus development test -
3. be based on Vector VT The system of the car ECU Automated testing solutions - You know
4. automobile UDS Detailed diagnosis and Vector Instructions for use of relevant tool chains ——6.2 VT System introduction _ Lao Meng _ The blog of -CSDN Blog

VT System form

Simply speaking ,VT The system is a small chassis loaded with multiple boards （ Pictured ）, Each board provides different functions , Used for testing .

Height is 5U, The width is ½U and 1U Two sizes .

VT The board of the system is mainly used to simulate various hardware devices , Basically, it can cover all kinds of sensors and actuators used in the car . For devices that cannot be covered , Some boards can be optionally FPGA Add on modules , More functions can be realized through programming , For example, the analog signal output board can use FPGA Realize the output of arbitrary waveform .

VT System function

first , When ECU After the software and hardware of are developed , Needs to be Access to real systems in , Connect each sensor and load , Input a specific signal to it , Observe whether the corresponding functions and actions are correct . When testing the fault detection strategy , It is necessary to manually disconnect the sensor or load , To detect ECU Whether the fault can be detected .

This method is extremely inefficient and difficult to automate , therefore VT The system came into being .

VT System Used instead of connecting to ECU Of Real actuators and sensors . These actuators and sensors are composed of VT System Simulate the corresponding components . if necessary VT What the component simulates I/O The signal can be connected with the real sensor and actuator at the same time .

be based on VT System  Of ECU Automated test system

Carry out car ECU The general method of automated testing is simulation ECU Peripheral residual bus , Peripheral devices such as sensors and actuators . This is actually an open loop 、 Closed loop simulation , That is simulation ECU Simultaneous observation of working environment ECU Behavior in a specific test state . The necessary functions of such a test system include the ability to simulate the bus , Sensors and actuators , Simulation and measurement ECU Of I/O And script testing . As shown in the figure below .

be based on Vector CANoe Software ,vTESTstudio Test case writing tool 、VN Series network interface cards and VT The test system is built ECU Automated test platform , Can realize the right ECU Conduct efficient automated testing , Improve test efficiency , Save testing time and labor costs .

Basic composition

be based on VT Of ECU The basic composition of automatic test system

1. Test cases are test scripts developed according to relevant requirements or test specifications . Generally, tools are written based on test cases vTESTStudio Realization , Improve test case writing efficiency and test case coverage .
2. CANoe： Provide test execution and management environment .
3. VT System ：I/O Signal simulation and test modular hardware platform , Analog sensors , Actuator and other external equipment .
4. PicoScope（ Optional ）：USB Oscilloscope , be used for CAN/LIN/FlexRay Physical layer test .
5. VH6501/CANStressDR（ Optional ）：CAN(FD) Bus jammer , For physical testing ,Busoff, Sampling point test .
6. Other equipment ： Build controller working and testing environment , Including program-controlled power supply , Load box, etc .

Basic workflow

be based on Vector The basic workflow of the test tool chain

1. CANoe It is set bus simulation 、 Record 、 Automobile network development software testing in one , Its integrated test environment provides support for test system construction and automated test process , Include ： Network communication and high-level protocol simulation 、 Test process record 、 Test script generation 、 Test panel development 、 Test mode and function library integration .CANoe It also provides the function of test panel design , The test process can be controlled intuitively through the panel , And check the output results of the controlled unit .VT The hardware test system adopts modular design , Optional I/O card , For simulation DUT Input the signal and detect its output , At the same time, it has current acquisition interface and control interface of power supply .
2. VT The board has the following characteristics ： Highly integrated , The onboard signal conditioning module can cover the requirements of the automotive industry for signal simulation and acquisition , Some boards have on-board fault injection function , Meet diagnostic testing requirements ; Integrated in CANoe, It can completely cover the needs of network testing , Such as interaction layer 、 Network management 、 Diagnostic protocol, etc .
3. Test case writing software vTESTstudio In addition to providing C#,CAPL Script , State machine , Flow chart and command line programming , It also integrates requirements management 、 Variant management and defect tracking interface , Convenient for test coverage statistics , Development and maintenance of test cases ; You can use CAN、LIN、FlexRay 、Ethernet Relevant communication database ; Diagnostic database can be used (CDD、ODX) The elements in ; The test mode can be parameterized graphically , Link and modify CAPL Test cases in the Library ; Output the test list in the form of test specification , For inspection and review .

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additional ：VT  System Board function

VT The board of the system can : simulation ECU Power supply （KL15 & KL30）、 Resistance sensor 、 Potentiometer 、 Analog signal input 、 Digital signal input 、 Constant resistance load 、 Constant current load and other external equipment , And it can simulate the fault of open circuit or short circuit to the positive and negative poles of the power supply , In addition, it can be directly connected ECU Output IO mouth , Measure the output voltage and current , Basically, it can cover all kinds of sensors and actuators used in the car . For devices that cannot be covered , Some boards can be optionally FPGA Add on modules , More functions can be realized through programming , For example, the analog signal output board can use FPGA Realize the output of arbitrary waveform .

VT System Contains processor modules 、CAN/LIN modular 、 Load and measurement module 、 Incentive module 、VT Power supply module 、ECU Power management module 、 Numbers IO modular 、 Analog quantity IO modular 、 Relay module and expansion module , Via Ethernet and CANoe Connect .

• Signal path switching ;
• measurement ECU The output signal ;
• Simulation ECU load ;
• ECU Input signal excitation ;
• fault injection , Analog signal to power 、 Short circuit to ground or between wires ;
• control ECU Power supply of ;
• Atom/Core2 processor , Run the simulation and test program ;
• 4 passageway CAN/LIN Interface card , Support bus fault simulation .

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