A method for estimating engine friction torque

摘要

A method is disclosed using algorithms for real-time estimation of the engine friction torque in a vehicle powertrain is disclosed. The engine friction torque is estimated at start and at engine idle. Recursive and computationally efficient algorithms allow prediction of friction torque for a wide range of speeds and loads even with few new measured points by taking into account physical dependencies used for adaptation of the sites of the look-up tables (static maps). The algorithms make it possible to avoid drivability problems that could result from errors in estimating engine friction torque.