スライディングモード制御を用いた高性能***回転制御

概要

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The idle speed reduction is one of the important solutions for fuel economy improvement. And to achieve it, it is required to improve the performance of idle speed control to prevent from engine stall. In the mass production engines, PID is mainly used for the idle speed control because of easiness of design. Recently there are many studies applying the linear control theory like LQG and H infinity to improve the performance. However there are few studies applying the nonlinear control theory in spite of the idle speed control system has non linearity like torque and friction characteristic. So we have pursued to develop the algorithm the performance of which is superior to PID and LQG by applying the sliding mode control (SMC) representative in the nonlinear control theory. In this study, at first we built the low order model of the system by using the design specifications and simple experimental results, and then we designed three controllers applying PID, LQG and SMC. And consequently we could achieve the above aim by adopting the acceleration reaching law to nonlinear input in SMC instead of the conventional constant reaching law.
2001-03-25