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

1993-02-22

1995-03-21

Miller, Carl S.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, F02M 3704

Patent

active

053986628

ABSTRACT:
An evaporative fuel-processing system for an internal combustion engine, incorporates an evaporative emission control system in which a first control valve is arranged across an evaporative fuel-guiding passage extending between a fuel tank and a canister, a second control valve across a purging passage extending between the canister and the intake system of the engine, and a third control valve at an air inlet port of the canister, respectively. An ECU generates operation command signals to the first to third control valves for closing or opening the same to bring the evaporative emission control system into a predetermined negatively pressurized state. The ECU is responsive to an output from a parameter sensor which detects at least one of vehicle speed, temperature within the fuel tank, and an amount of fuel within the fuel tank, for determining whether there is an abnormality in the evaporative emission control system, based upon an output from a tank internal pressure sensor. The output is obtained when the evaporative emission control system has been brought into the predetermined negatively pressurized state, when the value of at least one parameter detected by the parameter sensor falls within a predetermined range.

REFERENCES:
patent: 5158059 (1992-10-01), Kuroda
patent: 5193512 (1993-03-01), Steinbrenner
patent: 5197442 (1993-03-01), Blumenstock
patent: 5220896 (1993-06-01), Blumenstock
patent: 5228421 (1993-07-01), Orzel

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