Acf Industries, Incorporated

Mark A Jefferis

Paul M Meyer

Chusak Tansuwan

Richard D Doerr

Richard D Allman

Steven R Bollinger

Robert H Beckwith

Apparatus for automatically controlling the idle speed of an internal combustion automobile engine. A sensor senses the operating speed of the engine and develops an electrical signal representative thereof. Movement of a carburetor throttle valve from an open to a substantially closed position is sensed and an electrical signal indicative thereof is generated. Closure of the throttle valve indicates the engine is operating at idle. A controller is responsive to the second electrical signal to process the electrical signal from the sensor and generate an electrical control signal. The controller processes the electrical signal from the sensor means in accordance with a predetermined format based upon a transfer function derived for the engine. An electromechanical device is responsive to the control signal for moving the throttle valve to a desired position at which engine idle speed is a preselected speed determined in accordance with the transfer function.

Engine automatic idle speed control apparatus

Apparatus for use in developing and testing a control system for an internal combustion automobile engine. A housing is located in the automobile where it can be visually observed by an operator of the automobile. Electrical circuitry is installed in the housing. A wiring harness interconnects sensors and electromechanical devices with the circuitry. A programmable memory has a plurality of addresses which are selectably accessible, different addresses in the memory containing information relating to different aspects of the system. Information stored in a selected memory address is changeable thereby changing the operating characteristics of the system. The contents stored in a selected address are visually displayed so an operator can visually verify the information stored therein. Operation of the system while the engine is running is visually monitored to determine system performance during road tests, performance of the system thus being observable under actual driving conditions.

Fuel control system development apparatus

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Webster Groves, MO, United States of America

Mark A Jefferis