Nobuo Kurihara

An integral variable structure compensation method for electronic throttle control with input constraint

Recently, the electronic throttle control (ETC) is popular in the automotive industry, it equipped with nonlinear characteristics because of its discontinuous nonlinear spring and model-parameter changes caused by external environmental variables. In this paper, we propose an integral variable structure compensation method by using sliding mode control (SMC) in order to improve the robustness of the ETC with input constraint and so as to realize higher intake-air efficiency for the engine practically. The electronic throttle model is introduced as a controlled object with parameter changes caused by body temperature variations regarded as the unstable factor. The input constraint can be compensated by the mutual effect of compensation gain and variable switching gain. The simulation results confirmed that by the proposed method, the excellent robustness of the electronic throttle is kept by the proposed method on the premise that 95% of the requested throttle opening can be reached within 100 ms, even if the input voltage is considered, and model-parameter changes are loaded. In addition, the chattering is also eliminated greatly.

A study of discrete-time sliding mode control for SI engine idle speed control

This paper investigates the application to the provision of integral discrete sliding mode tracking control with input constraint for engine idling speed control because the control logic are always implemented in discrete-time by microprocessors. The subject of this experiment is to improve the stability of the system against disturbances such as fuel purges and torque loads. A discrete Sliding mode control based on servo system is employed that effectively remove the steady-state error when the bias power disturbance occurs. The control logic also concluded a design of feedback compensation gain, derived from the control input difference, to compensate for control input constraint. A mean-value engine model combined with dead time and superimposed disturbances was constructed in Matlab/Simulink. The simulation results showed the issue relating to steady-state deviation was successfully solved under the disturbances having bias power, and also robustness was maintained during engine speed fluctuations.

Quick response of electronic throttle control by expanding SMC

The electronic throttle control (ETC) of an intake air control system for a gasoline engine is a typical nonlinear system because of its discontinuous nonlinear spring and model-parameter changes caused by external environmental variables. In this paper, we propose the use of an expanding sliding mode control (ESMC) in order to improve the 2responsiveness of the ETC and so realize higher intake-air efficiency for the engine. The electronic throttle model is introduced as a controlled object with parameter changes caused by body temperature variations regarded as the unstable factor. The system was simulated for a wide open throttle, and the results confirmed that the response time of the electronic throttle is dramatically shortened by the proposed ESMC on the premise that 95% of the requested throttle opening can be reached within 100 ms, even when model-parameter changes are loaded. In addition, the response for a small step series showed high resolution.