| Summary: | 碩士 === 國立雲林科技大學 === 機械工程系碩士班 === 94 === In this study we modify the Kymco APEX 125cc four-stroke carburetor fueled single cylinder gasoline engine with the addition of fuel injection system on the intake manifold. The engine intake control system is replaced by the idle speed controller (ISC). A throttle position sensor (TPS) is used in the throttle valve to replace the mechanical throttle of carburetor system, and a DC motor is used to drive the throttle valve automatically.
In the experiment, an embedded Digital Signal Processor (DSP) circuit is used to implement the control system, adjusting fuel injection and ignition timings based on the rotating speed and throttle position of the engine. The DSP software is written to pick the best duty cycle and advance angle of the injection timing, by either two-dimensional interpolations or fuzzy logic techniques.
With the proposed throttle-by-wire technology using electric motors to operate the throttle valve rather than mechanical linkage, we are able to integrate the throttle information into the control system and to achieve constant-speed control of the engine. PI controllers are used to control throttle position, and the engine speed, and the effects of integral windup are also discussed in this thesis.
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