Tank-venting system for a motor vehicle and method for checking the operability thereof
AssigneeRobert Bosch GmbH
InventorsUlrich Steinbrenner, Helmut Denz, Ernst Wild, Wolfgang Wagner
Life of this patent
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Abstract
A tank-venting system has an adsorption filter (AF) with a venting line (BL) which can be shut off by means of a controllable shut-off valve (AV). The shut-off venting valve makes it possible to set underpressures and overpressures in the system in a concerted manner in order to check its operability. As a result, particularly reliable information relating to the operability can be obtained.
Claims5
A tank-venting arrangement for a motor vehicle having an internal combustion engine equipped with an intake pipe, the arrangement comprising:
- a fuel tank;
- an adsorption filter;
- a filter line connecting said fuel tank to said adsorption filter;
- a venting line connected to said adsorption filter;
- a controllable shut-off valve arranged in said venting line;
- a valve line connecting said adsorption filter to said intake pipe;
- a tank-venting valve mounted in said valve line for closing and opening said valve line to said intake pipe;
- control means for closing said shut-off valve and for opening said tank-venting valve;
- and,
- measuring means for measuring whether underpressure builds up in said tank when said shut-off valve is closed and said tank-venting valve is opened thereby enabling a conclusion to be made that said arrangement is operative.
A method for checking the operability of a motor vehicle tank-venting system having an adsorption filter with venting line, which connects a fuel tank to the intake pipe of an internal combustion engine via a tank-venting valve, the method comprising the steps of:
- shutting off the venting line of the adsorption filter;
- opening the tank-venting valve;
- and,
- measuring whether underpressure is building up in the tank and, if this is the case, reaching the conclusion that the system is operative.
Dependencies are inferred from the claim text.