The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 07, 1995
Filed:
Oct. 20, 1993
Patrick J Curran, Farmington Hills, MI (US);
Paul M Niessen, Canton, MI (US);
Bryce A Schwager, Ypsilanti, MI (US);
Ford Motor Company, Dearborn, MI (US);
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.