Ge Yunshan

Gasoline engine idle speed control system development based on PID algorithm

One of the often-running modes for a gasoline engine is idling, and idle speed stability is one of the key aspects to evaluate a vehicles performance when it is equipped with a gasoline engine. Therefore, it is very important to control the idle speed stability and to keep the idle speed constant in spite of the various engine load disturbances. In order to reach this goal, usually the closed loop control is applied. Among various control algorithms, traditional PID algorithm has been used successfully for many applications. The key advantages of PID control are its simplicity and practicality. Its control parameters can be tuned on line; the flexibility of its software development makes it easier to get a better control result. In this paper, based on PID control algorithm, an idle speed control system for 462Q electronic controlled gasoline engine is developed. The hardware design of this system, the design of the digital PID controller, the selection of the sample interval and the method for tuning the control parameters are introduced in detail.

The power control and performance simulation for an electric transmission system of tracked vehicle

How to control the process of continuously variable transmission is an important issue in the electric transmission system of a tracked vehicle. It is presented in this paper that the constant power of brushless DC motor (BLDCM) is controlled by the feedback (observation) of power, and that it is proved feasible on testing. Based on the above, the range of motor speed is expanded by winding change namely the configuration change, and rotational speed ranges corresponding to winding forms are settled by our study. Finally, some of the total performance simulation results are showed and analyzed, which lay a foundation for the future.

A micro-processor based adaptive ignition control system

An adaptive ignition control system can adjust ignition angle automatically, so the power of the SI engine is improved while preventing it from knock. This paper describes an ignition control system, whose core is a micro-processor (80C552). The inputs include intake manifold pressure sensor, throttle position sensor, water temperature sensor, crankshaft position (speed) sensor, synchronization sensor and knock sensor. The software of the system includes main flow program and several interruption programs. The article describes how the knock signal acquisition, knock condition judgment, ignition-signal, etc. are controlled by the software. The peak-value of the knock signal is recorded in a circuit during one cycle, and accordingly this value of the knock is detected. A new two-parameter ignition angle adjusting method is used, which is according to the peak-value of knock signal during one cycle and the mean value of several cycle peak-values. This method effectively resolved the contrast of the high response and small cycle fluctuation of ignition angle control. The experiments on 368Q engine shows that the design of the system hard-and-software is feasible and the engine is prevented from knock effectively, the torque of the engine is improved.

Simulation of vehicular emission features in terms of engine emission performance

The paper presents a new vehicular emission simulation method, aiming to improve the prediction of the overall vehicular emission in terms of engine emission performance characteristic of the early design stage. The method helps to optimize the matching performance of the vehicle and the engine by reducing the number of parameters to fewer engine running points.