Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Kurt D. Mc Lain0
Date of Patent
October 21, 2008
0Patent Application Number
115609860
Date Filed
November 17, 2006
0Patent Primary Examiner
Patent abstract
A diagnostic control system for a purge valve that regulates fuel vapor flow from a fuel system into an intake manifold for an engine includes a calculation module and a malfunction module. The calculation module estimates a plurality of areas based on a plurality of pressure signals and calculates an average rate of increase of vacuum pressure in the fuel system during operation of the purge valve. The malfunction module determines whether the average rate of increase of vacuum pressure is within a predetermined range generating a purge valve functioning signal, and generates a purge valve malfunction signal when the average rate of increase of vacuum pressure is not within the predetermined range.
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