Patent ID: 7991537

Claim:
A method for adjusting a calculation model used for calculating on-time values (t) for an injector of a cylinder in a combustion engine of a motor vehicle based on a fuel injection quantity value (δ) representing a desired quantity of fuel to be injected into the cylinder, the method comprising: controlling the on-times for the injector by an engine control based on the calculation model; determining the fuel injection quantity value (δ) by the engine control with the aid of a regulator based on the vehicles' present operating conditions; determining or receiving a torque loss value (T loss ) representing a present torque loss of the engine under a present operating conditions of the vehicle and a combustion efficiency value (ε F ) representing a present combustion efficiency of the cylinder under the present operating conditions; calculating, based on the torque loss value (T loss ) and the combustion efficiency value (ε F ), an actual fuel injection quantity value (δ actual ) representing an actual quantity of fuel injected into the cylinder; C) determining an on-time value (t a ) by the calculation model based on the actual fuel injection quantity value (δ actual ) and comparing the on-time value (t a ) with the presently applied on-time value (t b ) for the injector established by the engine control with the aid of the regulator and the calculation model based on the present operating conditions; D) adjusting the calculation model based on the result of the comparison; and disconnecting an output shaft of the engine from an output shaft of the vehicle's gearbox.