Tank-venting system for a motor vehicle and method for checking the operability thereof
First Claim
Patent Images
1. 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.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
5 Claims
-
1. 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. - View Dependent Claims (2)
-
-
3. 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. - View Dependent Claims (4, 5)
-
Specification