Method of feedback controlling engine idle speed

Details Method of feedback controlling engine idle speed Method of feedback controlling engine idle speed

1983-09-15

1985-01-08

Cuchlinski, Jr., William A.

Internal-combustion engines

Engine speed regulator

Idle speed control

123585, 123589, F02M 300, F02M 2306

Patent

active

044921950

ABSTRACT:
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, O.sub.2 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.

REFERENCES:
patent: 4383515 (1983-05-01), Higashiyama et al.
patent: 4389996 (1983-06-01), Yaegashi et al.
Powell et al., "Linear Quadratic Control Design for Nonlinear IC Engine Systems", Powerplant Dynamics, Sept. 7, 1981.
Morris et al., "Engine Idle Dynamics and Control", SAE Technical Paper Series, Passenger Car Meeting, Troy, Michigan, Jun. 7-10, 1982.

Affiliated with

Also associated with

Rating

Method of feedback controlling engine idle speed does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of feedback controlling engine idle speed, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of feedback controlling engine idle speed will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-109108