System and method for idle speed control

Details System and method for idle speed control System and method for idle speed control

1995-06-06

1997-09-16

Dolinar, Andrew M.

Internal-combustion engines

Engine speed regulator

Idle speed control

12333917, 12333918, 180 693, F02D 4108, F02D 4300

Patent

active

056669178

ABSTRACT:
A system and method for engine idle speed control delay operation of a vehicle accessory (26) while introducing a stored torque disturbance profile corresponding to that vehicle accessory into a feedforward engine control system so as to minimize variation of engine idle speed. Torque disturbances resulting from operation of an alternator (32), power steering pump (28), or air conditioning compressor and blower (30) are characterized and stored in the memory of an electronic control module (22). When a request for operation of an accessory is detected, the stored profile is fed into the control system prior to actual operation of the accessory so as to reduce or eliminate control system response time. Control logic (22) also provides a learning function by modifying the stored profiles to accommodate changes in engine and accessory operation.

REFERENCES:
patent: 4467761 (1984-08-01), Hasegawa
patent: 4545449 (1985-10-01), Fujiwara
patent: 4582032 (1986-04-01), Hara et al.
patent: 4724810 (1988-02-01), Poirier et al.
patent: 5249559 (1993-10-01), Weber et al.

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