HYBRID POWERTRAIN WITH THREE-MODE DEPLETION STRATEGY AND METHOD OF OPERATING A HYBRID POWERTRAIN

摘要

A hybrid powertrain for propelling a vehicle includes an engine and an energy storage system operatively connected to the engine. Both the engine and the energy storage system are operable for providing power to propel the vehicle. A control system is operatively connected to the engine and the energy storage system and is configured to execute a stored algorithm that determines required energy reserve, remaining energy, and power capability of the energy storage system. The control system commands operation in one of a first operating mode, a second operating mode, and a third operating mode based on the required energy reserve, the remaining energy, and the power capability of the energy storage system.

主权项

1. A hybrid powertrain for propelling a vehicle comprising:
an engine; an energy storage system operatively connected to the engine; wherein both the engine and the energy storage system are operable for providing power to propel the vehicle; a control system operatively connected to the engine and the energy storage system and configured to execute a stored algorithm that:
determines required energy reserve, remaining energy, and power capability of the energy storage system; andcommands operation in one of a first operating mode, a second operating mode, and a third operating mode based on the required energy reserve, the remaining energy, and the power capability of the energy storage system; wherein in the first operating mode the engine is off and power from the energy storage system alone propels the vehicle; wherein in the second operating mode power from the energy storage system propels the vehicle and the engine is on to add power to propel the vehicle when the power capability of the energy storage system is insufficient to provide a predetermined level of power; and wherein in the third operating mode power from the energy storage system propels the vehicle, and the engine is on to add power to propel the vehicle when the power capability of the energy storage system is insufficient to provide the predetermined level of power, and the engine is on to add energy to the energy storage system when the remaining energy of the energy storage system is less than the required energy reserve.