公开(公告)号：US5195498A

公开(公告)日：1993-03-23

申请号：US854424

申请日：1992-03-19

申请人： Johann Siebler ,  Stephan Pelters ,  Andreas Blumenstock ,  Helmut Denz ,  Axel-Rene Michelet ,  Siegfried Wesinger ,  Kurt Almstadt ,  Jens Druckhammer

发明人： Johann Siebler ,  Stephan Pelters ,  Andreas Blumenstock ,  Helmut Denz ,  Axel-Rene Michelet ,  Siegfried Wesinger ,  Kurt Almstadt ,  Jens Druckhammer

IPC分类号： B60K15/035 ,  F02M25/08

CPC分类号： B60K15/03504 ,  B60K15/035 ,  F02M25/0809

摘要： The invention is directed to a method of checking the tightness of a tank-venting apparatus for a motor vehicle having a fuel tank and an internal combustion engine including a lambda controller and an air intake pipe. The tank-venting apparatus includes an adsorption filter, a supply line interconnecting the adsorption filter and the fuel tank, a connecting line interconnecting the adsorption filter and the intake pipe and a tank-venting valve mounted in the connecting line between the adsorption filter and the intake pipe. The method includes the steps of: measuring the pressure difference between pressure in the tank and ambient pressure; when the tank-venting valve is opened, determining whether the pressure difference increases above a threshold value and whether a lean correction by the lambda controller is required; and, drawing the conclusion that the tank-venting apparatus leaks when neither a lean correction is determined nor the pressure difference exceeds the threshold value. The method is based on the recognition that, when the tank-venting valve is open, either an underpressure must build up in the tank or a lean correction must be determined by the lambda controller based on the fuel vaporizing in the tank. The method is very reliable by simultaneously carrying out these two checks.

摘要翻译： 本发明涉及一种检查具有燃料箱和包括λ控制器和进气管的内燃机的机动车辆的排气装置的密封性的方法。 排气装置包括吸附过滤器，将吸附过滤器和燃料箱相互连接的供给管线，连接吸附过滤器和进气管道的连接管路和安装在吸附过滤器和吸入过滤器之间的连接管路中的排气阀 进气管。 该方法包括以下步骤：测量罐内压力与环境压力之间的压力差; 当通气阀打开时，确定压力差是否增加到阈值以上，以及是否需要通过λ控制器的精益校正; 并且得出当没有确定倾斜校正或压差都超过阈值时，排气装置泄漏的结论。 该方法基于这样的认识，即当排气阀打开时，负压必须在罐中积聚，或者通过基于燃料在罐中蒸发的λ控制器来确定稀疏校正。 该方法通过同时进行这两个检查非常可靠。