Apparatus for monitoring air leakage into fuel supply system for

Details Apparatus for monitoring air leakage into fuel supply system for Apparatus for monitoring air leakage into fuel supply system for

1993-06-07

1994-09-20

Miller, Carl S.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, F02M 3704

Patent

active

053479718

ABSTRACT:
An apparatus for monitoring air leakage into a fuel supply system for an internal combustion engine is provided. This system comprises a pressure sensor for detecting a pressure level in a fuel supply passage of the fuel supply system which communicates between a fuel tank and an intake passage of the engine and providing a signal indicative thereof, an air leakage control valve for leaking ambient air into the fuel supply passage at a preselected rate, and an air leakage monitoring unit for detecting a first pressure in the fuel supply system when the air leakage control valve is closed to restrict the leakage of the ambient air and a second pressure when the air leakage control valve is open to leak the ambient air into the fuel supply passage, the air leakage monitoring unit providing an alarm signal indicating that there is a preselected amount of air leakage in the fuel supply system based on a difference between the first and second pressures.

REFERENCES:
patent: 4794790 (1989-01-01), Margarit-Metaxa et al.
patent: 5105789 (1992-04-01), Aramaki
patent: 5143035 (1992-09-01), Kayanuma
patent: 5146902 (1992-09-01), Cook
patent: 5158054 (1992-10-01), Otsuka
patent: 5172672 (1992-12-01), Harada
patent: 5186153 (1993-02-01), Steinbrenner
patent: 5193512 (1993-03-01), Steinbrenner
patent: 5205263 (1993-04-01), Blumenstock
patent: 5245973 (1993-09-01), Otsuka

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