The software uses the company program software to program, and realizes the interlock protection function of various logic control functions in the system. The lower computer software has high requirements for the real-time reliability of the test. We use the system in the lower industrial computer and use it for programming. After the main program starts running, it closes the interrupt, reads the relevant configuration file, initializes it, then turns on the interrupt function and keeps looping. There are two interrupt service subroutines in the program, one for processing the real-time measurement speed acceleration and the other for processing the serial communication with the upper industrial computer. During the test, the lower IPC is not operated. The keyboard operation provided by the program is mainly used for debugging and maintenance. At the same time, the lower IPC is installed in the cabinet and does not provide a display. In order to prevent the crash due to misoperation, the watchdog technology is adopted.
We use the speed measurement method to measure the vehicle speed, which ensures that the test accuracy can be achieved at different speeds. On this basis, the acceleration signal is obtained, and the resistance value should be calculated and passed to the upper computer. In this way, the lower position machine transmits the speed, acceleration, fuel consumption and resistance through the serial port to the upper computer software part according to the customized protocol package, and the upper computer accepts the current speed acceleration fuel consumption of the vehicle transmitted from the lower computer and monitors it. At the same time, the real-time resistance value sent by the lower position is transmitted to the inverter to simulate the road resistance according to the real-time speed-resistance curve. Here we select the configuration software. Its advantages are support hardware, a completely object-based development environment, embedded scripting language, easier user development, and the core, easy and secure implementation of monitoring, testing and human-computer interaction.
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