Self-diagnosis apparatus and method for fuel evaporative emissio

Details Self-diagnosis apparatus and method for fuel evaporative emissio Self-diagnosis apparatus and method for fuel evaporative emissio

1993-11-30

1995-05-30

Yuen, Henry C.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

F02M 3302

Patent

active

054192994

ABSTRACT:
A self-diagnosis apparatus and method for use in a fuel evaporative emission control system for a vehicle having an internal combustion engine. A space part of a fuel tank is coupled with an intake air passage via a vapor passage. Fuel vapors from the fuel tank pass through the vapor passage. A canister is provided in the vapor passage to absorb the fuel vapors from the fuel tank. The internal pressure of the space part of the fuel tank is detected by a pressure detecting unit. The quantity of change in the internal pressure during the lapse of a certain time period is calculated by a calculating unit. The internal pressure change quantity is compared with a predetermined reference value, and thus abnormality is judged by a judgement unit in accordance with the comparison result.

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