发明名称 |
Method and arrangement for diagnosing a tank-venting system |
摘要 |
The invention is directed to a method for checking the tightness of a tank-venting system used with an internal combustion engine having an intake pipe. The tank-venting system includes a fuel tank wherein fuel vapor forms, a storage device connected to the fuel tank, the storage device having a vent opening and a device for closing the vent opening, and a tank-venting valve interconnecting the intake pipe and the storage device whereby the fuel vapor is conducted from the tank to the intake pipe via the storage device and the tank-venting valve. The method includes the steps of: (a) during operation of the engine and while the venting opening is closed, carrying out one of the following: (a1) opening the tank-venting valve and drawing a predetermined quantity of gaseous substance through the tank-venting valve, or (a2) opening the tank-venting valve and drawing a gaseous substance through the tank-venting valve so long until a predetermined underpressure is reached in the tank-venting system, so that a pressure fluctuation is produced in the tank-venting system with the pressure fluctuation being characterized by a plurality of characteristic variables; (b) evaluating at least one of the characteristic variables to judge the tightness of the tank-venting system.
|
申请公布号 |
US5666925(A) |
申请公布日期 |
1997.09.16 |
申请号 |
US19960647757 |
申请日期 |
1996.05.15 |
申请人 |
ROBERT BOSCH GMBH |
发明人 |
DENZ, HELMUT;WILD, ERNST;BLUMENSTOCK, ANDREAS;MALLEBREIN, GEORG |
分类号 |
G01M3/24;B60K15/077;F02M25/08;F02M37/00;G01M3/26;(IPC1-7):F02M37/04 |
主分类号 |
G01M3/24 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|