Caterpillar Inc.

George W Mattson

Geoffrey D Ginzel

An engine speed command selector and method of selecting an engine speed command signal from two command signals includes a selector switch having a local and a remote position, a local low indicator, a local high indicator, a local mode indicator and a remote mode indicator; the engine speed command selector permits an operator to change between local and remote mode when a local engine speed command is within a predetermined tolerance of a remote engine speed command and the operator has moved the selector switch to the desired mode position.

Engine command selector and method of operating same

An apparatus for determining if a combustion condition in a combustion chamber of an internal combustion engine occurred includes a combustion sensor for sensing the occurrence of the combustion condition in the combustion chamber and producing a combustion signal responsive to the combustion condition, a temperature sensor for sensing a temperature condition in an exhaust passage from the combustion chamber and producing a temperature signal having a characteristic indicative of the sensed temperature condition, and a controller connected for receiving the combustion signal and the temperature signal and operable in the absence of receipt of an expected combustion signal to determine if the combustion condition occurred by comparing the temperature signal characteristic with a predetermined characteristic value indicative of the occurrence of the combustion condition in the combustion chamber.

Diagnostic apparatus and method for a combustion sensor feedback system

A method for detecting noise on a conductive path utilized for conducting combustion signals produced by a combustion sensor of an internal combustion engine is disclosed. Essentially, the combustion sensor, when operable, produces combustion signals responsive to the occurrence of combustion conditions in a combustion chamber of the engine. According to the present invention, the conductive path is monitored for noise signals at a time when the combustion signal is not expected to occur, such that, logically, any noise signal present will be discovered. A controller is connected to a conductive path for conducting combustion signals produced by a combustion sensor and is operable to monitor the conductive path for noise signals during a time when it is not monitoring for an expected combustion signal.

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Lacon, IL, United States of America

George W Mattson