| 摘要 |
PROBLEM TO BE SOLVED: To provide a throttle control system which can speed up a rise-up and a fall-down so as to enhance the responsiveness of a throttle valve and the entire system even though an actuator having a large time constant due to an inductance, a resistance and the like is used. SOLUTION: This throttle control system is composed of an accelerator sensor 16 for setting a demanded opening of a throttle valve 3, a throttle opening sensor 14 for detecting an actual opening of the throttle valve, and an engine control unit 15 for driving a motor 1 in accordance with a duty ratio calculated from a demanded opening and an actual opening. The engine control unit 15 computes an ex-compensation duty ratio D by means of a PID computing means, and drives a motor in accordance with, a compensated duty ratio obtained by compensating the ex-compensation duty ratio D with a compensation value C which is obtained by adding an asymptotic compensating value which is asymptotic to the ex-compensation duty ratio, to an excessive compensating value which is calculated from a difference between this ex-compensation duty ratio D and an ex-compensation duty ratio DO previously computed, that is, (DO-D).
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