Abstract: A method and device for controlling a delivery device for an aqueous urea solution in a motor vehicle, with a tank, with a suction line, with a pump, with a pressure line, and with an injector, wherein the aqueous urea solution can be conveyed from the tank along the suction line, through the pump, through the pressure line, and to the injector. The method performs a rinsing procedure of at least the pressure line, wherein the pump is operated counter to its usual conveying direction during the rinsing procedure and the injector is closed in a first phase of the method, wherein the pump is operated for an operating duration t1 and at a speed of rotation n1 during the first phase of the method.

Abstract: A conveying device for an aqueous urea solution in a motor vehicle, with a tank, with a filter element and with a pump. The aqueous urea solution can be conveyed by the pump from the tank through the filter element into a suction line, wherein the filter element has a filter material and a frame for receiving the filter material, wherein the filter material is connected to the frame by a connection element, wherein the connection element is part of the fluid conveying path from the tank via the filter element to the pump.

Abstract: A method for operating a conveying device for an aqueous urea solution in a motor vehicle, having a pump for conveying the aqueous urea solution, wherein the aqueous urea solution is conveyed from a tank along a pressure line to an injector, wherein the injector is arranged on an exhaust gas line and is designed to inject the aqueous urea solution into the exhaust gas line. The conveying speed of the pump is controlled depending on the opening operations and closing operations of the injector and/or the pressure conditions resulting therefrom in the conveying section between the pump and the injector.

Abstract: A method for determining the length of a heated pressure line for a conveying device for an aqueous urea solution in a motor vehicle from a tank to an injector, wherein the pressure line is electrically heatable and is heated, using ohmic resistance, by the application of a voltage to an electrical conductor led on the pressure line, wherein the length of the pressure line is calculated by the following formula: l pressure ? line = R heating ? conductor × A ? where A designates the cross section of the electrical conductor and p the specific electrical resistance of the electrical conductor and Rheating conductor the electrical resistance of the electrical conductor used to heat the pressure line.