Torque measurement arrangement for combustion engine

摘要

The arrangement includes a combustion pressure sensor (13) which records an internal pressure of a combustion chamber (5). A memory unit (28) stores the internal pressure of the combustion chamber which has been recorded for each crank shaft angle. A current torque is calculated from a combustion pressure/crank shaft conversion coefficient with the crank angle as a parameter, and the pressure which was recorded during the combustion lift for each of a number of crank shaft angles. A torque is calculated through adding a number of the current torques which have been calculated for each combustion cycle. A torque change amount is calculated from the present combustion cycle and a combustion cycle of a predetermined number of cycles which precede the present combustion cycle. The internal pressure of the combustion chamber is recorded after the combustion, if no heat effects the combustion pressure sensor. The calculated torque is corrected through the recorded pressure and the combustion pressure/crank shaft conversion coefficient, according to the crank shaft angle at the point in time of the detection, whereby a torque change amount is calculated based on the corrected torque.