Evaporative fuel-processing system for internal combustion engin

Details Evaporative fuel-processing system for internal combustion engin Evaporative fuel-processing system for internal combustion engin

1994-03-16

1995-09-19

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, F02M 2508, F02M 3302

Patent

active

054508347

ABSTRACT:
An evaporative fuel-processing system for an internal combustion engine includes an evaporative emission control system having a fuel tank, a canister, a passage extending from the canister to an intake passage of the engine, and a purge control valve arranged across the passage, and a pressurization device for pressurizing the interior of the evaporative emission control system. An ECU actuates the pressurization device to bring the evaporative emission control system into a positively pressurized state, after the purge control valve and an open-to-atmosphere control valve arranged across a passage connected to the canister are closed, and detects an amount of evaporative fuel generated in the fuel tank. The ECU determines whether or not a leakage occurs from the evaporative emission control system, based on a rate of variation in pressure within the evaporative emission control system, and a reference value which is determined based on the amount of evaporative fuel detected.

REFERENCES:
patent: 5146902 (1992-09-01), Cook et al.
patent: 5261379 (1993-11-01), Lipinski et al.
patent: 5297529 (1994-03-01), Cook et al.
patent: 5299545 (1994-04-01), Kuroda et al.
patent: 5327873 (1994-07-01), Ohuchi et al.
patent: 5333590 (1994-08-01), Thomson

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