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This paper discusses a torque estimation method for combustion engines by utilizing nonlinear modeling. In the proposed method a precise nonlinear engine model is described, and is used to estimate the engine torque based on a crankshaft angle. Especially the torsional effect of the crankshaft is considered in the proposed framework to improve the estimation accuracy. The model requires derivatives...
In this paper, a nonlinear torque observer for spark ignition (SI) engine is proposed and a torque control method based on the observer is presented. In the observer, a torque production model is employed to give the nominal value of torque estimation. Then, using the rotational dynamic equation of the crankshaft, a nonlinear adjusting law is added to correct the nominal estimation. The proposed observer...
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