Apparatus for checking the tightness of a tank venting system
First Claim
1. An apparatus for checking the tightness of a fuel tank venting system, which serves to vent a fuel tank of a motor vehicle having an intake tube of an engine, an absorption filter connected to a ventilation line, a shutoff valve in said ventilation line which is closed during a fuel valve tightness check, a purging line which is closed by means of a regenerating valve during a fuel tank tightness check, and at least first and second pressure control devices for A production of an overpressure in the fuel tank, said at least first and second pressure control devices using only a fluid medium within the fuel tank venting system for producing pressure during fuel tank tightness check, the at least first pressure embodied as actuatable by means of a vacuum from a vacuum source control device (18) is actuatable to control an actuatable pressure on said at least one second pressure control device (22) from a vacuum source or from atmospheric pressure.
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Accused Products
Abstract
An apparatus for checking a tank venting system for leaks that serves to vent a fuel tank of a motor vehicle whose engine has a intake tube. The apparatus has an absorption filter connected to a ventilation line, which can be closed by means of a shutoff valve, and pressure producing devices for the production of an overpressure in the fuel tank. The pressure producing devices are embodied as actuatable by means of the vacuum in the intake tube in order to be able to forego the separate electromechanical drive devices for the pressure producing devices which have been necessary in the prior art.
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Citations
18 Claims
- 1. An apparatus for checking the tightness of a fuel tank venting system, which serves to vent a fuel tank of a motor vehicle having an intake tube of an engine, an absorption filter connected to a ventilation line, a shutoff valve in said ventilation line which is closed during a fuel valve tightness check, a purging line which is closed by means of a regenerating valve during a fuel tank tightness check, and at least first and second pressure control devices for A production of an overpressure in the fuel tank, said at least first and second pressure control devices using only a fluid medium within the fuel tank venting system for producing pressure during fuel tank tightness check, the at least first pressure embodied as actuatable by means of a vacuum from a vacuum source control device (18) is actuatable to control an actuatable pressure on said at least one second pressure control device (22) from a vacuum source or from atmospheric pressure.
Specification