Title:
【発明の名称】燃料蒸発-拘留システムのためのポンプ装置及び燃料蒸発-拘留システム
Document Type and Number:
Japanese Patent JPH10505398
Kind Code:
A
Abstract:
PCT No. PCT/DE96/00768 Sec. 371 Date Feb. 28, 1997 Sec. 102(e) Date Feb. 28, 1997 PCT Filed May 3, 1996 PCT Pub. No. WO97/02420 PCT Pub. Date Jan. 23, 1997A common feature of known pump devices, which for diagnostic purposes build up an overpressure in a fuel vapor trapping system, is that a connection of an adsorption filter with the ambient air is closed for the duration of the diagnosis. In the event of a malfunction of the shutoff valve, for instance from seizing, a buildup of negative pressure that is dangerous to the fuel tank can occur, which can be avoided by guard valves provided on the fuel tank according to the following pump device, whose valves needed for generating the overpressure are embodied such that in an open position of a regeneration valve and in a closing position of a shutoff valve, by means of an adequate flow cross section ASchutz of the valves such a slight flow resistance is effected that an attainment of a negative pressure harmful to the fuel tank is precluded. The pump device according to the invention is intended for a fuel vapor trapping system of an internal combustion engine.
Inventors:
Andreas Blumenstock
Application Number:
JP50468297A
Publication Date:
May 26, 1998
Filing Date:
May 03, 1996
Export Citation:
Assignee:
ROBERT BOSCH GMBH
International Classes:
B60K15/035; F02M25/08; F04B9/127; (IPC1-7): F02M25/08; B60K15/035
Attorney, Agent or Firm:
Toshio Yano (3 outside)