Japanese Patent JPS6349060

B2

Engine idle speed is feedback controlled on the basis of multivariable control method by using mathematical dynamic models to determine engine state variables. In the present invention, low-order (e.g. 4 order) dynamic models are adopted for facilitating calculations. The resulting control error is reduced or eliminated by several features as follows: the difference between the target idle speed and the current engine speed is integrated; an appropriate dynamic model is selected according to engine operating condition (coolant temp, O2 sensor); an appropriate control gain is determined according to engine load condition (air conditioner); the initial integral value of speed difference and the initial state variables are determined according to the engine speed at which the throttle valve is fully closed and the engine speed at which control starts in table look-up method; the target engine idle speed is corrected according to engine conditions; feedforward control is additionally provided, etc.

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TAKAHASHI TOORU
UENO TAKASHI

JP15953382A

October 03, 1988

September 16, 1982

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NISSAN MOTOR

F02D41/40; F02D31/00; F02D41/08; F02D41/14; F02D41/16; F02D43/00; F02D45/00; F02M25/07; F02P5/15

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