Other

Gm Global Technolgoy Operations, Inc.

Stephen William Smerika

Eric Edward Krueger

Michael Paul Turski

Michael Douglas Rizzo

Loren Michael Trotter

Paul Stephen Zombory

Robert Paul Black

Vincent E Marchese

Luke Sewell

An improved engine torque control method uses existing powertrain sensors and controls to reliably detect and suppress power-hop with minimum degradation of vehicle acceleration. Power-hop is detected by identifying a characteristic wheel jerk magnitude and oscillation frequency based on driven wheel speeds. Once a power-hop condition is detected, the control method computes a desired engine torque output for suppressing the detected power-hop without unnecessarily degrading vehicle performance, based on the wheel jerk magnitude, the engine speed and vehicle acceleration. A combination of engine cylinder fuel cut-off and spark retard is then scheduled for reducing the engine output torque to the desired level for the duration of the power-hop condition. The control method has minimal impact on vehicle cost since it is performed (preferably) by engine or other control software, and has been shown to quickly and effectively suppresses power-hop and its disadvantages without significantly degrading vehicle performance.

Power-hop responsive engine torque control method

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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Fenton, MI, United States of America

Stephen William Smerika