System for detecting purge valve malfunction

Details System for detecting purge valve malfunction System for detecting purge valve malfunction

2006-11-17

2008-10-21

Moulis, Thomas N (Department: 3747)

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

C123S520000

Reexamination Certificate

active

07438060

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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