Method and apparatus for controlling the solenoid current of a s

Details Method and apparatus for controlling the solenoid current of a s Method and apparatus for controlling the solenoid current of a s

1986-10-20

1988-09-13

Dolinar, Andrew M.

Internal-combustion engines

Engine speed regulator

Idle speed control

F02D 4116

Patent

active

047701404

ABSTRACT:
A method and apparatus are provided for controlling the solenoid current of a solenoid valve which controls the amount of suction air in an internal combustion engine. An actual current flowing through the solenoid is detected and a solenoid current control value is calculated as a function of engine operating conditions. A corrected solenoid current control value is determined as a function of the solenoid current control value and a feedback control term is calculated as a function of the difference between the corrected solenoid current control value and the actual solenoid current. An initial value for the feedback control term is determined as a function of an integration term which forms part of the feedback control term. A pulse duration signal is determined as a function of the corrected solenoid current value and an output pulse duration signal is calculated as a function of the pulse duration signal and the feedback control term. In another aspect, a predetermined current control value is used as the corrected solenoid current control value when the engine speed is above a predetermined value. In still a further aspect, the output pulse duration is corrected as a function of battery voltage.

REFERENCES:
patent: 4134373 (1979-01-01), Kibler et al.
patent: 4378766 (1983-04-01), Yamazoe et al.
patent: 4446410 (1984-05-01), Yagura et al.
patent: 4491113 (1985-01-01), Gassler et al.
patent: 4526144 (1985-07-01), Hasegawa et al.
Patent Abstracts of Japan, vol. 9, No. 80, (M-370) [1803], Apr. 10, 1985, (JP-A-59-211741).

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