Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1991-12-20
1993-03-30
Miller, Carl S.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123198D, F02M 3302, F02B 7700
Patent
active
051974428
ABSTRACT:
A tank-venting arrangement includes: a tank having a tank closure; an electrically drivable check valve; an adsorption filter; connecting lines for interconnecting the above components; a difference pressure sensor which measures the pressure difference between the pressure in the tank and the ambient pressure and supplies a pressure difference signal; a comparator which, at least for a running engine, compares the pressure difference signal to upper and lower threshold values and supplies an opening signal to the check valve to open the latter when the pressure difference signal is greater than the upper threshold value and a closure signal for closing the check valve when the pressure difference signal drops below the lower threshold value; and, a detector unit which supplies an opening signal to the check valve for opening the check valve when the sensor determines a possible opening of the tank and a closure signal for closing the check valve when the sensor determines a possible closure of the tank. With the aid of the check valve and the difference pressure sensor which measures the pressure difference between the pressure in the tank and the ambient pressure, the tank-venting arrangement can be so operated that at least for a running engine, a desired maximum overpressure in the tank can be obtained relative to the ambient pressure independently of the extent of the underpressure in that part of the arrangement forward of the check valve.
REFERENCES:
patent: 4343281 (1982-08-01), Uozumi
patent: 4702216 (1987-10-01), Haruta
patent: 4703737 (1987-11-01), Cook
patent: 4862856 (1989-09-01), Yokoe
patent: 4872439 (1989-10-01), Sonoda et al.
patent: 4903672 (1990-02-01), MacKinnon
patent: 5067468 (1991-11-01), Otowa
Blumenstock Andreas
Denz Helmut
Steinbrenner Ulrich
Wild Ernst
Miller Carl S.
Ottesen Walter
Robert & Bosch GmbH
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