Patent ID: 8775058

Claim:
A method for determining injection times for a plurality of injectors in a motor vehicle, comprising: prior to the vehicle going on the road: performing testing to generate complete characteristic fields for at least one of the injectors, each complete characteristic field defining an injection time-mass flow relationship for a complete range of mass flows for the at least one injector; adapting the complete characteristic fields using an injector individual correction (IIC) method to generate IIC-adapted complete characteristic fields for the at least one injector; and storing the IIC-adapted complete characteristic fields in a memory of the motor vehicle; and while the vehicle is on the road: performing minimum fuel mass adaption (MFMA) measurements according to an MFMA method to determine MFMA-measuring points, the MFMA measurements covering only a low-mass-flow subset of the complete range of mass flows; comparing the determined MFMA measuring points in the low-mass-flow subset of mass flows to respective points of the stored IIC-adapted complete characteristic fields for at least on injector; based on the comparisons, adjusting the stored IIC-adapted complete characteristic fields and storing the adjusted complete characteristic fields in the vehicle memory; and determining injection times based on the stored adjusted complete characteristic fields.