Tank-venting arrangement and method for checking the tightness t

Details Tank-venting arrangement and method for checking the tightness t Tank-venting arrangement and method for checking the tightness t

1991-12-20

1993-06-22

Miller, Carl S.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, F02M 3302

Patent

active

052208966

ABSTRACT:
A tank-venting arrangement includes: a tank; an adsorption filter connected to the tank; a tank-venting valve interconnecting the adsorption filter and the intake pipe of the engine; a control unit for driving the tank-venting valve so that it closes or opens; a pressure difference sensor for measuring the pressure difference between the pressure in the tank and the ambient pressure; and, an integrating unit for determining the time integral of the pressure difference. With this tank-venting arrangement, a simple and reliable determination can be made as to when so much fuel vapor should have been adsorbed in the active charcoal filter so that when the tank-venting valve is opened thereafter, a lean correction by means of a lambda controller can be required. If this lean correction is not made, this is an indication that the fuel flowing from the tank has not reached the tank-venting valve so that the tank-venting arrangement leaks or is obstructed.

REFERENCES:
patent: 4817576 (1989-04-01), Abe
patent: 4862856 (1989-09-01), Yokoe
patent: 4872439 (1989-10-01), Sonoda et al.
patent: 4949695 (1990-08-01), Uranishi
patent: 5021071 (1991-06-01), Reddy
patent: 5085194 (1992-02-01), Kuroda
patent: 5143035 (1992-09-01), Kayanuma

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