TORQUE MANAGEMENT ALGORITHM FOR HYBRID ELECTRIC VEHICLES

摘要

A system and method for determining a commanded engine and motor torque to minimize fuel consumption (Mf) and manage battery state of charge (?soc) in a hybrid electric vehicle. The method includes determining a penalty factor (p) value that dictates the usage of the battery. A cost value is determined for every feasible engine torque for a selected or demanded vehicle torque and speed request. Each cost value is determined by a fuel consumption (Mf) value, a change in the battery state of charge (?soc) and the penalty factor value (p). The change in the battery state of charge (?soc) is determined from the motor power and a nominal battery state of charge (?soc). For a specific penalty factor (p), a look-up table for optimal engine torque is generated for different requested vehicle torques at various vehicle speeds. A separate look-up table is provided for each penalty factor (p).