System for correcting output from tank internal-pressure sensor

Details System for correcting output from tank internal-pressure sensor System for correcting output from tank internal-pressure sensor

1995-09-07

1996-10-01

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

F02M 2508

Patent

active

055603467

ABSTRACT:
A system for correcting an output from a tank internal-pressure sensor in an evaporative fuel processing device including a fuel tank, and a tank internal-pressure sensor provided in the fuel tank or in an evaporative fuel passage between the fuel tank and a pressure regulating valve. In a condition in which it is difficult to generate an evaporative fuel within the fuel tank, a canister opened to the atmosphere and the fuel tank are brought into communication with each other over a predetermined time. A reference value is reset based on a first detection value detected immediately before the communication, a second detection value detected immediately before releasing the communication, and a reference value stored in a reference value storing device. Thus, it is possible to enhance the accuracy of correction of the output from the tank internal-pressure sensor.

REFERENCES:
patent: Re35054 (1995-10-01), Chikamatsu et al.
patent: 5267547 (1993-12-01), Chikamatsu et al.
patent: 5419299 (1995-05-01), Fukasawa et al.
patent: 5427075 (1995-06-01), Yamanaka et al.
patent: 5443051 (1995-08-01), Otsuka
patent: 5448980 (1995-09-01), Kawamura et al.
patent: 5460142 (1995-10-01), Denz et al.

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