Apparatus for detecting fuel-vapor gas leaks, and vent valve...

Details Apparatus for detecting fuel-vapor gas leaks, and vent valve... Apparatus for detecting fuel-vapor gas leaks, and vent valve...

2006-01-17

2006-01-17

Lo, Weilun (Department: 3747)

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

C123S516000, C123S518000, C123S1980DA, C073S049700, C073S118040, C137S596170, C137S625260, C251S129030, C251S129190

Reexamination Certificate

active

06986341

ABSTRACT:
An apparatus for detecting fuel-vapor gas leaks that includes a jet pump (8) that introduces outside air into and pressurizes a vapor purge system including a fuel tank (1) by gasoline flow from a fuel pump (2); an internal pressure sensor (14) for measuring vapor purge system internal pressure, an open/close controllable reference orifice (21) that causes leakage through a reference leak hole; and a storage device for storing as an initial curve pressure changes during pressurization by the jet pump (8) for a predetermined time period, with the reference orifice (21) alone opened. The device can accurately detect leakage even while an internal combustion engine is running because it judges leak presence/absence by comparing a time series in a pressure curve obtained by jet pump (8) pressurization over the predetermined time period while idling with the vapor purge system completely shut-off, with a time series in the initial curve.

REFERENCES:
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patent: 2001-012319 (2001-01-01), None

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