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In this paper we present a method to estimate combustion torque against a crankshaft angle of a reciprocating engine. We introduce a singular angle of a crankshaft at which an external torque value is sampled directly from crankshaft angular acceleration and show examples for a variety of engines under symmetries. When the bandwidth of external torque signal is less than the Nyquist frequency of periodic...
This paper presents a torque estimation method for a reciprocating engine from crank sensor signals. The method calculates angular velocity and acceleration of an engine crankshaft utilizing smoothed implicit derivatives from crank sensor samples. Then crankshaft torque is calculated through the motion equations of an engine. Combustion torque, which contains useful information for engine control,...
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