Research On Robustness Of Engine Electronic Control System Based On Hardware-in-the-loop Simulation Platform

With the continuous development of the advanced controller technology, engine management system (EMS) grows more and more powerful, accordingly the demand for electronic control system robustness also becomes higher and higher. Engine control system relies on sensors to collect information from outside, and leans on this information to drive actuator. Thus the accuracy of the sensor signal is vital to the reliability of engine electronic control system.During the development of the controller, in order to ensure the accuracy of the signal collected by the electronic control system, a maximum and minimum reasonable diagnosis will be taken to identify whether the signal has open-circuit or short circuit to ground or power, and thus to determine the signal reliability. The opening size, which is measured by throttle position sensor, is used to judge the air flow in engine electronic control system. Throttle position sensor will inevitably be interfered by the signal of outside, and thus appears the signal fluctuation in the vicinity of normal value. But this phenomenon has a lot of randomness, it is difficult to exclude by reasonable diagnosis method. Therefore, in order to study the impact of throttle position sensor-fault on the robustness of engine electronic control system, a method to establish senor-fault simulation is proposed in this paper. Firstly, a hardware-in-the-loop (HIL) simulation platform, which was used for EMS function test, is developed in the LabVIEW and VeriStand environment. Secondly, by using this platform, a sensor-fault simulation system is set up for throttle position sensor, and then the fault-tolerant control system is designed for different fault types. Finally, the effectiveness of the fault-tolerant control system is verified by the HIL simulation platform, then comparison between simulation and real vehicle test shows that the system established by this method could satisfy the test requirement, and has the advantage of higher reliability, convenience and precision.