Method and system for monitoring evaporative purge flow

Details Method and system for monitoring evaporative purge flow Method and system for monitoring evaporative purge flow

1994-09-12

1996-02-06

Miller, Carl S.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, F02M 3704

Patent

active

054889367

ABSTRACT:
An evaporative purge flow monitoring system is provided for use in a motor vehicle having an internal combustion engine, a fuel tank, and an evaporation canister in communication with the fuel tank and the engine for trapping and subsequently reusing fuel vapor dispelled from the fuel tank. The evaporative purge flow monitoring system includes a vapor management valve interposed between the engine and the evaporation canister. An Electronic Engine Control (EEC) assembly is further provided in communication with the vapor management valve and the engine wherein the EEC assembly is provided with a test logic to determine satisfactory operation of the vapor management valve. The test logic determines whether the vapor management valve is defective based on either the presence of significant fuel vapor as determined by the test logic or a change in an engine performance parameter generated within the EEC assembly without requiring a separate sensor when the vapor management valve is temporarily closed.

REFERENCES:
patent: 4867126 (1989-09-01), Yonekawa
patent: 5085194 (1992-02-01), Kuroda
patent: 5105789 (1992-04-01), Aramaki
patent: 5230319 (1993-07-01), Otsuka
patent: 5265577 (1993-11-01), Denz
patent: 5313925 (1994-05-01), Otsuka
patent: 5353771 (1994-10-01), Blumenstock
patent: 5359980 (1994-11-01), Tomisawa

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