Patent ID: 8756920
Filing Date: 2014-06-24
Classification: F01N,Y02T,Y10T

Abstract:
1. A method of controlling a metering device for metering fuel into an exhaust gas duct of a combustion engine for regenerating a particle filter, wherein the metering device supplies the fuel to the exhaust gas duct over a security valve, a first fuel pipe, a metering valve, a second fuel pipe, and an injection check valve, the method comprising: actuating the metering valve; measuring a fuel pressure between the metering valve and the injection check valve in the second fuel pipe; recording the fuel pressure over time; determining an opening pressure of the injection check valve using the recorded fuel pressure between the metering valve and the injection check valve; comparing the fuel pressure to a first threshold value, wherein upon the pressure of the fuel exceeding the first threshold value, a defective injection check valve stuck in closed state is assumed; and comparing the fuel pressure to a second threshold value, wherein a defective injection check valve stuck in open state or a leakage is assumed if the fuel pressure is below the second threshold value, the second threshold value being lower than the first threshold value.