Patent ID: 8347840
Filing Date: 2013-01-08
Classification: F02N

Abstract:
1. A process for starting a direct-injecting internal-combustion engine, a crankshaft being provided for driving a camshaft (NW) of the internal-combustion engine by way of mechanical driving devices, the mechanical driving devices comprising an adjusting mechanism having an electric machine (EM) for adjusting the camshaft and operating the mechanical driving devices, and a position determining device (PB) for determining positions of pistons of cylinders of the internal-combustion engine; wherein the process comprises the steps of: switching off the internal-combustion engine using the electric motor when the internal-combustion engine is switched off to rotate the cam shaft within a specified angular range and until a cam rests on an end stop of a valve of the internal combustion engine and blocks the cam shaft, continuing using the electric motor to operate the mechanical driving devices to cause an angular position change between the crankshaft and the camshaft without opening the valve so that an unspecified piston of the internal combustion engine is moved into proximity to an upper dead center position of a corresponding cylinder and so that a working medium therein is compressed maximally; determining the positions of the pistons of the internal combustion engine by using the determining device prior to a subsequent starting of the internal combustion engine for identifying the cylinder of the internal combustion engine that has the working medium therein maximally compressed; issuing a starting command; and injecting fuel into the cylinder determined by the determining device to have the working medium maximally compressed when the piston thereof is in the selected proximity to the upper dead center, for starting the internal-combustion engine.