Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1993-10-20
1995-02-07
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
F02M 3302
Patent
active
053868129
ABSTRACT:
An evaporative purge flow monitoring system is provided for use in a motor vehicle having a fuel tank and an internal combustion engine having an intake manifold. The purge flow monitoring system includes an evaporation canister in fluid communication with the fuel tank and a canister purge valve in fluid communication with the fuel tank and evaporation canister. A thermistor/resistor network is further provided in fluid communication with the canister purge valve and the intake manifold. An electronic engine control (EEC) assembly is similarly provided in electrical communication with the canister purge valve and the thermistor/resistor network such that the EEC is adapted to determine the voltage difference across the thermistor/resistor network resulting from discrete measurements within the canister purge valve duty cycle during a selected window of operation and compare the determined voltage difference to a calibrated difference so as to detect malfunctions of the canister purge valve.
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Curran Patrick J.
Niessen Paul M.
Schwager Bryce A.
Abolins Peter
Ford Motor Company
May Roger L.
Moulis Thomas N.
Nelli Raymond A.
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