Patent ID: 9181834
Filing Date: 2015-11-10
Classification: F01N,Y02T

Abstract:
1. A method for adapting an injection medium supply for an exhaust-gas purification system having an injection system with an injection medium tank, an injector, a pump which is connected to the injector via at least one line, and a pressure discharge valve arranged in a line downstream of the pump, the method comprising the steps of: a) setting a nominal value for an injection medium pressure in the line downstream of the pump in relation to the ambient pressure, b) opening the pressure discharge valve for a predefined time t, c) determining a first pressure difference, caused by the opening in step b), between the nominal value and injection medium pressure directly after step b), d) setting a nominal value for an injection medium pressure in the line downstream of the pump in relation to the exhaust-gas pressure in the exhaust-gas purification system, e) opening the injector for a predefined time t, f) determining a second pressure difference, caused by the opening in step e), between the nominal pressure and injection medium pressure directly after step e), g) comparing the first and second pressure differences, and h) adapting an injector opening time if necessary.