| 摘要 |
In a powertrain that includes wheels 32-35 for driving a vehicle 10, a crankshaft, a machine 16 driveably connected to the crankshaft and able to operate alternately as an electric motor and electric generator, a transmission 14 including an input clutch driveably connected to the crankshaft and an output driveably connected to the wheels, a method for controlling idle speed, preferably during a vehicle creep condition, comprises steps of producing a desired magnitude of input clutch torque capacity, producing a desired wheel torque, using an error represented by a difference between a desired crankshaft idle speed and a current crankshaft speed to determine a desired change in torque produced by the machine, using the magnitude of input clutch torque capacity and the desired change in torque produced by the machine to determine a desired magnitude machine torque, and using the machine to produce said desired magnitude of machine torque. Preferably the vehicle is a hybrid vehicle and a battery 42 is connected to the machine to supply energy thereto also battery charge status is determined and engine torque and machine torque are adjusted accordingly to maintain a desired battery charge. |
