Method For Determining A Cylinder Pressure-Crankshaft Position Assignment For An Internal Combustion Engine
A method for determining a cylinder pressure-crankshaft position association for an internal combustion engine, including metrological detection of the crankshaft angle; metrological detection of the cylinder pressure; calculation of a cylinder volume as a function of the crankshaft angle; determination of a curve for the logarithmic cylinder pressure over the logarithmic cylinder volume as a function of the crankshaft angle; analysis of the curve, and determination of an offset value for the crankshaft angle for determining a temporally exact cylinder pressure-crankshaft position association.
1 .- 8 . (canceled)
9 . A method for determining a cylinder pressure-crankshaft position association for an internal combustion engine, comprising:
metrological detection of a crankshaft angle;
metrological detection of a cylinder pressure;
calculating of a cylinder volume based at least in part on the crankshaft angle;
determining of a curve for a logarithmic cylinder pressure over a logarithmic cylinder volume based at least in part on the crankshaft angle;
analyzing the curve;
determining of an offset value for the crankshaft angle for determining a temporal cylinder pressure-crankshaft position association;
concluding that a cylinder pressure signal is retarded in relation to a crankshaft angle signal when an intersection of curve segments of the curve is determined in a region of a cylinder reversal point; and
determining an offset value for compensating displacement is determined as a function of a surface area between the curve segments of the curve in the region of the cylinder reversal point.
10 . The method according to claim 9 , wherein the determination of the cylinder pressure-crankshaft position association for the internal combustion engine is carried out automatically in fired operation of the internal combustion engine.
11 . The method according to claim 9 , wherein the determination of the cylinder pressure-crankshaft position association for the internal combustion engine is carried out automatically in towed operation of the internal combustion engine.
12 . The method according to claim 9 , further comprising analyzing the curve in the region of the cylinder reversal point to determine the offset value.
13 . The method according to claim 12 , wherein the curve in the region of a bottom cylinder reversal point is analyzed to determine the offset value.
14 . The method according to claim 12 , wherein the curve in the region of a top cylinder reversal point is analyzed to determine the offset value.
15 . The method according to claim 12 , further comprising:
concluding that a cylinder pressure signal is premature in relation to the crankshaft angle signal when a non-intersection of curve segments of the curve is determined in the region of the cylinder reversal point; and
determining an offset value for compensating displacement as a function of the surface area between the curve segments of the curve in the region of the cylinder reversal point.