Idle speed control apparatus for internal combustion engine

Details Idle speed control apparatus for internal combustion engine Idle speed control apparatus for internal combustion engine

1986-02-19

1987-01-27

Cox, Ronald B.

Internal-combustion engines

Engine speed regulator

Idle speed control

123436, F02D 1110

Patent

active

046387781

ABSTRACT:
Apparatus for controlling idle speed of an internal combustion engine (M1) equipped with fuel injection valves (M2) comprises a throttle actuator (M4) associated with a throttle valve (M3), engine speed detecting unit (M5), intake air quantity detecting unit (M6), and electronic control unit (M8) for controlling the fuel injection valves (M2) and the throttle actuator (M4). The electronic control unit (M8) comprises a target idle speed setting unit (M9), a target intake air quantity setting unit (M10), and an integral-added optimal regulator (M11) for determining feedback amounts respectively in connection with the amount of fuel to be injected and the opening degree of the fuel injection valves. In such apparatus, target intake air quantity is determined as a value which makes fuel supply amount minimum on the basis of correlation between intake air quantity and fuel supply amount when the target idle speed is made constant. The integral-added optimal regulator determines the amount of feedback on the basis of an optimal feedback gain predetermined according to the dynamic model of the system relating to the operation of the internal combustion engine. As a result, the rotational speed of the internal combustion engine is controlled to a target idle speed with high response and stability characteristic.

REFERENCES:
patent: 4432322 (1984-02-01), Inoue
patent: 4475506 (1984-10-01), Riordan
patent: 4513713 (1985-04-01), Koumura
patent: 4550701 (1985-11-01), Suzuki
patent: 4562814 (1986-01-01), Abo

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