Method And Engine Controll Unit

An engine control unit for approximating a stored pilot control map of a pressure control valve of a common-rail pump to the effective pilot control map of the pressure control valve, comprising

• a first data storage area for a pilot control map that maps a desired pressure on a control current of the pressure control valve,
• a second data storage area for a measured point, especially a measured pressure,
• wherein the engine control unit comprises a processor that is programmed in such a way that it adapts a pilot control map stored in the first data storage area by means of a regression process that includes a measured point stored in a second data storage area, and
• wherein the engine control unit is operable to
• a) measure the pressure in the rail;
• b) determine the control current of the pressure control valve;
• and
• c) adapt the stored pilot control map by means of a regression process including the pressure measured in a) and the control current measured in b).

A method for approximating a stored pilot control map of a pressure control valve of a common-rail pump to the effective pilot control map of the pressure control valve, the method comprising the steps of:

• measuring the pressure in the rail;
• determining the control current of the pressure control valve;
• and
• adapting the stored pilot control map by means of a regression process including the measured pressure and the control current.