METHOD AND APPARATUS FOR CONTROLLING A POWERTRAIN SYSTEM EMPLOYING MULTIPLE TORQUE GENERATING DEVICES

摘要

A powertrain system for a vehicle is described, and includes an internal combustion engine mechanically coupled to an electric machine to generate propulsion torque and electric power storable on an energy storage device. A method for controlling the powertrain system includes determining a first desired powertrain output power associated with a road load and determining a second desired powertrain output power associated with a feed-forward state-of-charge (SOC) for the energy storage device. The internal combustion engine and the electric machine are controlled responsive to the first and second desired powertrain output powers.

主权项

1. A method for controlling a powertrain system for a vehicle that includes an internal combustion engine mechanically coupled to an electric machine to generate propulsion torque and electric power storable on an energy storage device, the method comprising:
determining a first desired powertrain output power associated with a road load; determining a second desired powertrain output power associated with a feed-forward state-of-charge (SOC) for the energy storage device; and controlling, by a controller, the internal combustion engine and the electric machine responsive to the first and second desired powertrain output powers; wherein determining the second desired powertrain output power associated with the feed-forward SOC for the energy storage device comprises:
determining a desired SOC ramp rate based upon vehicle speed and the road load;determining a target desired SOC based upon an operator-selected charge mode;determining a filtered target SOC based upon the desired SOC ramp rate and the target desired SOC;executing a time-rate derivative of the filtered target SOC; anddetermining the second desired powertrain output power associated with the feed-forward SOC for the energy storage device based upon the time-rate derivative of the filtered target SOC.