Patent ID: 7921700
Filing Date: 2011-04-12
Classification: F02D

Abstract:
1. A method for determining cylinder-specific combustion features of an internal combustion engine, the method comprising: ascertaining, using a processor arrangement, the cylinder-specific combustion features from a variable which represents a speed of a crankshaft, the cylinder-specific combustion features including: i) a combustion position of at least one cylinder, and ii) a torque of the crankshaft; wherein the torque is a mean indicated torque over an angular range of a crankshaft angle, wherein the combustion position is determined from a differential gas-torque curve ascertained over the angular range of the crankshaft angle, wherein the differential gas-torque curve is ascertained from the difference between a gas-torque curve and an overrun-torque curve, and wherein the cylinder-specific combustion features are ascertained from a signal of one of a crankshaft sensor and a camshaft sensor.