Gm Global Technolgoy Operations, Inc.

Robert Paul Black

William Conrad Albertson

Mike M McDonald

Alfred E Spitza, Jr

Kevin J Storch

Richard H Clutz

Richard L Tiberg

Colin A Roberts

William S Beggs

Bala K Murthy

Eric S Kaufman

Stephen William Smerika

Terrence E Connolly

An engine control system comprises a driver input module, a cylinder actuation module, and an active fuel management (AFM) module. The driver input module generates a fuel saver mode (FSM) signal having a first state based upon a driver input. The cylinder actuation module selectively disables at least one of a plurality of cylinders of an engine based upon a deactivation signal having a first state. The AFM module generates the deactivation signal based on at least one engine parameter and at least one threshold. The at least one threshold is modified when the FSM signal has the first state.

Engine control system for increased vehicle fuel economy

The engine operating angle at which a determined fuel injection quantity is delivered to the engine is varied in accord with barometric pressure variations to compensate an engine air-fuel mixing time to offset variations in air-fuel mixture homogeneity prior to combustion, promoting complete combustion, increased engine performance, increased catalytic converter efficiency and durability over a wide range of barometric pressure values.

Altitude dependent fuel injection timing

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Milford, MI, United States of America

Robert Paul Black