Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1995-05-31
1996-08-27
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
123198D, 123198DB, 123529, F02D 4122
Patent
active
055490972
ABSTRACT:
A system 10 for controlling the operation of a propane powered vehicle engine includes a gas sensor 28 for providing a fuel rich signal and a fuel lean signal to a controller 20. The controller is also responsive to a tachometer 26 which senses the engine rpm. When the engine speed is in excess of a preselected value and is not decelerating, the controller generates an unacceptable engine operation signal if the period of duration of the fuel rich signal exceeds a preselected value. A warning unit 32 is provided for alerting the operator of a service required signal from the controller. A fuel shutoff device 30 automatically terminates the fuel supply to the engine in response to a fuel shutoff signal from the controller. The method of the invention allows for vehicle startup after the fuel shutoff device has been activated. The invention is particularly well suited for requiring a propane powered vehicle engine to output an acceptable level of carbon monoxide in the exhaust gas.
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Argenbright Tony M.
PGI International Ltd.
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