Procedure and device for the increase in value of one dose arrangement

摘要

The invention concerns a procedure for controlling a metering device for metering fuel into the exhaust gas duct of a combustion engine for the regeneration of a particle filter, whereby 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 and whereby the pressure of the fuel is determined between the metering valve and the injection check valve in the second fuel pipe. It is thereby provided that an opening pressure of the injection check valve is determined from the pressure course between the metering valve and the injection check valve.

主权项

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.