An Experimental Study on Engine Dynamics Model Based on Indicated Torque Estimation

摘要

Indicated torque has much information regarding the engine performance such as fuel burning rate, combustion heat release rate, mean effective pressure and fuel ratio. It is a good indicator of an engine's stability to do work. However, due to cost and integration complexities, it is not profitable to use instantaneous torque sensors in automotive series production. The work presented in this paper proposes a comprehensive and practical solution for indicated torque estimation and in-cylinder pressure. Thermodynamic model for predicting engine cycle and measured crankshaft speed fluctuations is used to reach the goal. The result of numerical prediction has been confronted with experimental data. The comparison between various variables, namely gas pressure, total torque and indicated torque, shows good agreement between simulation and experimental results.