摘要：AbstractThe indicated torque (TQin) is regarded as a key variable for both control and diagnostics of the combustion of gasoline engines. Due to the limitation in available sensors, the TQin, however, cannot be measured directly. In this paper, a real-time TQinestimation approach is presented, based on the instantaneous crankshaft rotational speed (ω) signal. A physics-based control-oriented model ω is developed for a four-cylinder gasoline direct engine, which takes account the load torque, friction torque and the indicated torque. The proposed observer are validated both in simulation and experiments at steady-state operating and during transients. Results show that deviation between the observed value and the actual value is within 4%. The optimized model based observer shows greater potential in engine combustion feedback control.
关键词：KeywordsInternal combustion enginesindicated torqueextended state observer
