Failure diagnosis apparatus for evaporative purge system

Details Failure diagnosis apparatus for evaporative purge system Failure diagnosis apparatus for evaporative purge system

1997-06-06

1999-03-09

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123519, F02M 3704

Patent

active

058787283

ABSTRACT:
A back-pressure chamber of a tank internal pressure regulating valve and a canister are connected to each other by a communicating passage. During purging, since the negative pressure in an evaporative purge system is introduced into the back-pressure chamber, the valve opening pressure setting of the tank internal pressure regulating valve is lowered. As purge-cutting is started, the internal pressure of the canister instantly rises to the valve opening pressure of an air intake valve, thereby increasing the pressure introduced into the back-pressure chamber. Consequently, the valve opening pressure setting of the tank internal pressure regulating valve rises, thereby suppressing the valve opening operation. Thus, diagnosis is prevented from becoming erroneous as the pressure regulating valve in the evaporative purge system opens during the failure diagnosis.

REFERENCES:
patent: 5396873 (1995-03-01), Yamanaka et al.
patent: 5398662 (1995-03-01), Igarashi et al.
patent: 5460143 (1995-10-01), Narita
patent: 5542397 (1996-08-01), Takahata et al.
patent: 5590634 (1997-01-01), Shinohara
patent: 5592923 (1997-01-01), Machida
U.S. Appln. No. 998,191, filed Dec. 29, 1992.
U.S. Appln. No. 006,902, filed Jan. 21, 1993.
U.S. Appln. No. 982,280, filed Nov. 25, 1992.

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