IC engine net torque calculator

摘要

The net torque produced by an ic engine is determined as the difference between the gross torque generated and the internal and external torque losses. Gross torque is estimated 2 in accordance with the amount of fuel injected 6. Internal engine torque losses due to friction are estimated 19 according to engine speed and coolant temperature and external torque losses are estimated 17 depending upon the auxiliary equipment being driven eg air conditioning units. An expected torque loss correction 21 is determined from an adaptive look up table 20 and is dependent upon coolant temperature. The estimated internal and external torque losses and the expected torque loss correction are summed 22,24 and subtracted 26 from the gross torque to produce an estimated net torque signal 1. When no power is being drawn by the gearbox the actual net torque is determined from the engine acceleration and the difference between the actual and estimated net torque is used to update the expected torque loss correction value in the adaptive look up table 20.