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

A device for determining an opening pressure of an injection check valve, comprising:

• a control electronic having a computer-readable storage medium comprising program instructions;
• wherein the injection check valve is a part of a metering device for supplying a fuel into an exhaust gas duct of a combustion engine for regenerating a particle filter, and wherein the fuel is supplied to the exhaust gas over a security valve, a first fuel pipe, a metering valve, a second fuel pipe, and the injection check valve, wherein a pressure gauge determines the fuel pressure in the second fuel pipe, and wherein the fuel pressure is recorded;
• and
• wherein the program instructions, when executed by the control electronic, causes the control electronic to:
• control the metering device, wherein a tracker is provided in the control electronic to determine a maximum in the recorded fuel pressure in a pressure in the second fuel pipe;
• compare 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
• compare the fuel pressure to a second lower 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, wherein the second threshold value is lower than the first threshold value.