Title:
PROCESS AND DEVICE FOR TANK VENTILATION
Document Type and Number:
WIPO Patent Application WO1992016734
Kind Code:
A3
Abstract:
PCT No. PCT/DE92/00127 Sec. 371 Date Sep. 22, 1993 Sec. 102(e) Date Sep. 22, 1993 PCT Filed Mar. 21, 1992 PCT Pub. No. WO92/16734 PCT Pub. Date Oct. 1, 1992.A method for alternately carrying out phases with and without tank venting during operation of an internal combustion engine equipped with a tank-venting assembly is characterized in that the ratio of the time spans with and without tank venting is selected to be dependent upon operating data of the engine or of the tank-venting assembly. Preferably, a variable is measured which is a measure for the fuel quantity to be regenerated during tank venting and the above-mentioned ratio is increased in favor of the tank-venting time span with respect to the base ratio when the value of the measured variable exceeds an upper limit (Dp-SMW; FTEA-SWU). This method makes possible that an adsorption filter and a tank-venting valve in the corresponding arrangement can be dimensioned for lesser throughput quantities than previously without the danger being present that fuel vapors escape to the ambient. The tank-venting time span is extended with respect to the base-adaptation time span when a large amount of fuel vapor occurs whereby the smaller adsorption filter still regenerates satisfactorily notwithstanding the reduced cross section of the tank-venting valve.
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Inventors:
DENZ HELMUT (DE)
WILD ERNST (DE)
BLUMENSTOCK ANDREAS (DE)
WILD ERNST (DE)
BLUMENSTOCK ANDREAS (DE)
Application Number:
PCT/DE1992/000127
Publication Date:
November 12, 1992
Filing Date:
February 21, 1992
Export Citation:
Assignee:
BOSCH GMBH ROBERT (DE)
International Classes:
F02D35/00; F02D41/00; F02M25/08; F02M37/00; (IPC1-7): F02M25/08; F02D35/00
Domestic Patent References:
| WO1990000225A1 | 1990-01-11 |
Foreign References:
| US4467769A | 1984-08-28 | |||
| EP0191170B1 | 1989-03-29 | |||
| DE3623894A1 | 1987-01-29 | |||
| US5048493A | 1991-09-17 | |||
| DE3928585A1 | 1990-03-08 | |||
| EP0208069A2 | 1987-01-14 | |||
| DE3008320A1 | 1980-09-18 |
Other References:
Patent Abstracts of Japan, vol. 9, no. 124 (M-383)[1847], 29. Mai 1985; & JP, A, 60008458 (FUJI) 17. Januar 1985, siehe Zusammenfassung
Patent Abstracts of Japan, Band 9, Nr. 202 (M-405)(1925) 20. August 1985, & JP, A, 6065245 (TOYOTA) 15. April 1985, siehe Zusammenfassung
Patent Abstracts of Japan, Band 9, Nr. 202 (M-405)(1925) 20. August 1985, & JP, A, 6065245 (TOYOTA) 15. April 1985, siehe Zusammenfassung
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