Diagnostic system for detecting leakage of fuel vapor from purge

Details Diagnostic system for detecting leakage of fuel vapor from purge Diagnostic system for detecting leakage of fuel vapor from purge

1997-03-31

1999-12-07

Williams, Hezron

Measuring and testing

With fluid pressure

Leakage

G01M 308

Patent

active

059964006

ABSTRACT:
A leakage diagnostic system for making a judgement of leakage of a fuel purge system, which has in order from the side of a fuel tank a control valve, a canister and a purge valve disposed in a purge passage and a relief valve isolating the canister from the atmosphere, based on a rising rate of pressure in the purge passage between the fuel tank and the intake system isolated from the atmosphere after lowering and keeping the interior of the purge passage below specified negative pressure level for a specified period of time. When the interior of the fuel tank increases above a threshold level after a specified period of time, the leakage diagnostic system delivers a judgement of leakage of the purge system.

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