Device for the metered addition of fuel

Abstract

The invention relates to a metering device for fuel, particularly diesel fuel, upstream of an oxidation catalyst of an exhaust gas system of an external combustion engine. According to the invention, downstream of a supply device for fuel, a closing valve and/or a metering valve and an injection valve are integrated in a fuel line. In the region of the metering device, at least one throttle restriction for damping pressure fluctuations is provided.

1 - 9 . (canceled) 
     
     
         10 . A metering device for fuel, in particular diesel fuel, upstream of an oxidation catalytic converter of an exhaust system of an internal combustion system in a motor vehicle, in which downstream of a supply device for fuel, a closing valve and/or a metering valve and an injection valve are integrated into a fuel line, and in the vicinity of the metering device, at least one device for damping pressure fluctuations is provided. 
     
     
         11 . The metering device as defined by  claim 10 , wherein a metering unit for fuel, in particular diesel fuel, is integrated with the metering device and is connected to the at least one device for damping pressure fluctuations. 
     
     
         12 . The metering device as defined by  claim 10 , wherein the at least one device for damping pressure fluctuations is downstream of a low-pressure circuit or a pump for fuel supply. 
     
     
         13 . The metering device as defined by  claim 10 , wherein the metering device or the metering unit is connected at least via a return line to a tank of the motor vehicle, and downstream of a connection point of the return line to a fuel inlet, the metering unit is provided with the at least one device for damping pressure fluctuations. 
     
     
         14 . The metering device as defined by  claim 11 , wherein the metering device or the metering unit is connected at least via a return line to a tank of the motor vehicle, and downstream of a connection point of the return line to a fuel inlet, the metering unit is provided with the at least one device for damping pressure fluctuations. 
     
     
         15 . The metering device as defined by  claim 12 , wherein the metering device or the metering unit is connected at least via a return line to a tank of the motor vehicle, and downstream of a connection point of the return line to a fuel inlet, the metering unit is provided with the at least one device for damping pressure fluctuations. 
     
     
         16 . The metering device as defined by  claim 10 , wherein the at least one device for damping pressure fluctuations is provided in a housing part of the metering unit and includes a container, or an expansion part, in a fuel inlet or in the fuel line, or in the housing part for receiving an additional fuel volume. 
     
     
         17 . The metering device as defined by  claim 11 , wherein the at least one device for damping pressure fluctuations is provided in a housing part of the metering unit and includes a container, or an expansion part, in a fuel inlet or in the fuel line, or in the housing part for receiving an additional fuel volume. 
     
     
         18 . The metering device as defined by  claim 12 , wherein the at least one device for damping pressure fluctuations is provided in a housing part of the metering unit and includes a container, or an expansion part, in a fuel inlet or in the fuel line, or in the housing part for receiving an additional fuel volume. 
     
     
         19 . The metering device as defined by  claim 13 , wherein the at least one device for damping pressure fluctuations is provided in a housing part of the metering unit and includes a container, or an expansion part, in the fuel inlet or in the fuel line, or in the housing part for receiving an additional fuel volume. 
     
     
         20 . The metering device as defined by  claim 14 , wherein the at least one device for damping pressure fluctuations is provided in a housing part of the metering unit and includes a container, or an expansion part, in the fuel inlet or in the fuel line, or in the housing part for receiving an additional fuel volume. 
     
     
         21 . The metering device as defined by  claim 15 , wherein the at least one device for damping pressure fluctuations is provided in a housing part of the metering unit and includes a container, or an expansion part, in the fuel inlet or in the fuel line, or in the housing part for receiving an additional fuel volume. 
     
     
         22 . The metering device as defined by  claim 16 , wherein the container or the expansion part for receiving an additional fuel volume is integrated into the metering unit between the closing valve and the metering valve. 
     
     
         23 . The metering device as defined by  claim 21 , wherein the container or the expansion part for receiving an additional fuel volume is integrated into the metering unit between the closing valve and the metering valve. 
     
     
         24 . The metering device as defined by  claim 16 , wherein the container or the expansion part for receiving an additional fuel volume is part of a valve block or of a fuel inlet or of the fuel line. 
     
     
         25 . The metering device as defined by  claim 21 , wherein the container or the expansion part for receiving an additional fuel volume is part of a valve block or of the fuel inlet or of the fuel line. 
     
     
         26 . The metering device as defined by  claim 10 , wherein downstream of the closing valve at a fuel inlet or at the fuel line, the metering valve is provided with at least one pressure sensor. 
     
     
         27 . The metering device as defined by  claim 11 , wherein downstream of the closing valve at a fuel inlet or at the fuel line, the metering valve is provided with at least one pressure sensor. 
     
     
         28 . The metering device as defined by  claim 10 , wherein between the closing valve and the metering valve, at least one damping throttle restriction having a pressure sensor is connected to the fuel inlet. 
     
     
         29 . The metering device as defined by  claim 11 , wherein between the closing valve and the metering valve, at least one damping throttle restriction having a pressure sensor is connected to the fuel inlet.