Method and system for controlling engine idle speed

Details Method and system for controlling engine idle speed Method and system for controlling engine idle speed

1990-12-10

1992-01-28

Dolinar, Andrew M.

Internal-combustion engines

Engine speed regulator

Idle speed control

123362, F02D 4116

Patent

active

050835416

ABSTRACT:
An engine idle speed control (ISC) method includes fully opening an idle speed control valve during an engine crank mode and opening the idle speed control valve to a fixed position during a diagnostic mode. The normal idle speed control mode includes selecting an open-loop idle speed control mode or a closed-loop idle speed control mode as a function of dashpot preposition, dashpot control, Pre-RPM control, RPM control, and RPM lockout protection. In the open-loop idle speed control, the duty cycle is the sum of a base duty cycle, a dashpot action adder, an engine coolant temperature compensation adder, a time-since-engine-start compensation adder, and other duty cycle adders for additional loads, such as air-conditioner. In the closed-loop idle speed control, the duty cycle is adjusted at the proper time and with an appropriate amount to maintain the idling speed at the desired speed.

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