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AssigneeFord Global Technologies, LLC
InventorsAndrew Donald James Fraser, John Stephen Mills, Davorin David Hrovat
Estimating the term…
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.
A method for controlling engine idle speed in a vehicle having an electronic control module in communication with an engine and at least one vehicle accessory powered by the engine such that operation of the at least one vehicle accessory causes a torque disturbance in operation of the engine, the method comprising:
A system for controlling engine idle speed in a vehicle having an engine and at least one vehicle accessory powered by the engine such that operation of the at least one vehicle accessory causes a torque disturbance in operation of the engine, the system comprising:
Dependencies are inferred from the claim text.