Method and apparatus for control of a hybrid electric vehicle to achieve a target life objective for an energy storage device
AssigneeGM Global Technology Operations LLC
InventorsAnthony H. Heap, Andrew M. Zettel, William R. Cawthorne
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Abstract
A method for determining a preferred operating gradient for use in attaining a life objective for an electrical energy storage device in a hybrid vehicle is disclosed. A present state-of-life of the electrical energy storage device is provided and a life target for the electrical energy storage device is established as a predetermined limit in a predetermined metric at a predetermined state-of-life of the electrical energy storage device. A state-of-life gradient is then determined with respect to the predetermined metric which converges the state-of-life of the electrical energy storage device to the life target.
Claims14
Method for operating a hybrid electric powertrain including an electrical energy storage device configured to exchange electrical energy with a hybrid vehicular powertrain including first and second electric machines, each machine operable to impart torque to a two-mode, compound-split electro-mechanical transmission having four fixed gear ratios and two continuously variable operating modes, comprising:
- establishing a state-of-life parameter associated with the electrical energy storage device;
- providing a present state-of-life of the electrical energy storage device;
- establishing a life target for the electrical energy storage device as a predetermined limit in a predetermined metric at a predetermined state-of-life of the electrical energy storage device;
- determining a state-of-life gradient with respect to the predetermined metric which converges the state-of-life of the electrical energy storage device to the life target;
- and
- operating the electric machines such that the electrical energy storage device state-of-life substantially tracks the state-of-life gradient.
Method for operating a hybrid electric powertrain including an electrical energy storage device adapted for exchanging electrical energy with a hybrid vehicular powertrain including first and second electric machines, each machine operable to impart torque to a two-mode, compound-split electro-mechanical transmission having four fixed gear ratios and two continuously variable operating modes, comprising:
- establishing a state-of-life parameter associated with the electrical energy storage device;
- providing a state-of-life gradient based on a present state-of-life of the electrical energy storage device and at least one predetermined limit of a predetermined metric associated with the state-of-life;
- and
- controlling electrical energy storage device current during periods of vehicle activity such that the electrical energy storage device state-of-life substantially tracks the state-of-life gradient.
Method for operating a hybrid electric powertrain including an electrical energy storage device configured to exchange electrical energy with a hybrid vehicular powertrain including first and second electric machines, each machine configured to impart torque to a two-mode, compound-split electro-mechanical transmission having four fixed gear ratios and two continuously variable operating modes, comprising:
- establishing an operating parameter comprising a state-of-life associated with the electrical energy storage device;
- and
- controlling power transmitted between the electrical energy storage device and the first and second electric machines during periods of vehicle activity such that the state-of-life associated with the electrical energy storage device is less than a predetermined value when a target life objective is attained.
Dependencies are inferred from the claim text.