Gm Global Technolgoy Operations, Inc.

George C Mitchell

Robert Charles Simon, Jr

Joseph M Tolkacz

David C Poirier

Peter M Medich

Steven Joseph Swantick

Mark T Matheny

Gerald J Wroblewski

Douglas W Menck

William G Polom

When the throttle of a vehicle engine is released by the vehicle operator of a vehicle having an automatic transmission, the slip of the automatic transmission is measured and the airflow of the engine is trimmed as a function of the measured slip to establish a desired drive-on feel of the vehicle during coastdown.

Engine coastdown control system

An idle speed control motor under computer control positions a throttle stop for setting minimum throttle angles. The motor response to actuating pulses varies from motor to motor so that a gain factor is determined for each motor and is used to calculate the required pulse width to attain a desired throttle displacement. A gain learn program in the engine control computer runs when the ignition is turned off and is effective to extend the motor with a number of pulses of known width, measure the throttle displacement, and determine the gain factor by dividing a standard displacement by the measured displacement. The same program is applied to learning the gain of a throttle motor in an electronic throttle control system.

Method of learning gain for throttle control motor

In a method of traction control, fuel injectors are selectively disabled to unfuel respective cylinders of an engine to reduce engine torque output. The method provides for limiting the number of cylinders that can be disabled for acceleration spin control based on engine and vehicle operating parameters to improve traction control performance and provide protection for the vehicle catalytic converter.

Vehicle traction control system with fuel control

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Ypsilanti, MI, United States of America

George C Mitchell