Fuel vapor leak detection system

Details Fuel vapor leak detection system Fuel vapor leak detection system

1995-02-24

1996-01-16

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, F02M 3302

Patent

active

054839424

ABSTRACT:
Differential flow sensing through respective flow path portions of a system for detecting leakage from an evaporative emission control system. A series flow path comprises a first flow sensor for sensing the entire output flow of an impeller pump used to positively pressurized the system under test, a second sensor in a portion of the series flow path that is downstream of the first flow sensor, and a calibrated orifice downstream of the second flow sensor. A branch circuit to the evaporative emission space under leakage test tees into the aforementioned series circuit between the first flow sensor and the second flow sensor. A differential amplifier receives signal from the respective sensors. Any difference in sensed flows, once the pressure has been brought to a predetermined pressure, is output by the differential amplifier to signify leakage in an amount correlated with the sensed difference in the flows.

REFERENCES:
patent: 5263461 (1993-11-01), Fujimoto et al.
patent: 5299544 (1994-04-01), Kitamoto et al.
patent: 5390645 (1995-02-01), Cook et al.

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