Patent ID: 7941266
Filing Date: 2011-05-10
Classification: F02D,F02N,Y02T

Abstract:
1. A method for controlling an internal combustion engine for a motor vehicle in stop-start operation, comprising the steps of: in response to a request for a switch-off of the internal combustion engine, controllably reducing the torque produced by the internal combustion engine while fuel injection is continued such that the speed of the internal combustion engine falls to below a predetermined setpoint idling speed, wherein the torque reduction is controlled such that the speed of the internal combustion engine is reduced in a controlled manner from (a) the predetermined setpoint idling speed (b) to a fuel injection switch-off speed at which a predetermined condition is met, the controlled manner of the speed reduction providing a less rapid reduction of speed than if the fuel injection was stopped upon the request for the switch-off of the internal combustion engine, if the request for switch-off of the internal combustion engine is canceled during the reduction of torque from the predetermined setpoint idling speed to the fuel injection switch-off speed, and before the fuel injection switch-off speed is reached, increasing the torque to or above the predetermined setpoint idling speed; and if the request for switch-off of the internal combustion engine is not canceled by the time the fuel injection switch-off speed is reached, switching off the fuel injection such that the speed of the internal combustion engine rapidly falls to zero.