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US 6,958,587 B1Granted
Torque distribution for multiple propulsion system vehicles
AssigneeGeneral Motors Corporation
InventorSanjeev M. Naik
Life of this patent
Estimating the term…
Abstract
A vehicle has multiple electrical propulsion systems. Torque is split among the various propulsion systems to meet a variety of requirements and limitations including operator demand, vehicular traction limits, electric machine torque capabilities, machine efficiency operating points and available electrical power.
Claims11
Method for distributing tractive torque among multiple propulsion systems in a vehicle comprising:
- providing a tractive torque request;
- determining complementary tractive torques for said propulsion systems operative to effect the tractive torque request;
- selecting a set of said complementary tractive torques meeting predetermined efficiency criteria;
- and
- controlling said propulsion systems in accordance with said selected set of complementary tractive torques.
2 more elements
Multiple propulsion system vehicle comprising:
- a source of electrical power;
- a plurality of electric machines operatively coupled to vehicle wheels and effective to provide tractive torque thereto;
- a computer based controller including a storage medium having a computer program encoded therein for distributing tractive torque among said electric machines that results in a substantially minimum electric machine power loss, said computer program including
- code for providing a desired tractive torque for the vehicle;
- code for determining complementary torques for said plurality of electric machines effective to meet the desired tractive torque for the vehicle;
- code for determining aggregate electric machine power losses for the complementary torques;
- code for selecting the complementary torques having a minimum aggregate electric machine power loss;
- and,
- code for controlling the electric machines based on the selected complementary torques.
6 more elements
Method for controlling multiple traction motors in a vehicle comprising:
- providing a total traction torque request based on operator demand and vehicular traction limits;
- determining multiple combinations of individual traction motor torques capable of providing the total traction torque request;
- aggregating individual traction motor power losses for each of said multiple combinations of individual traction motor torques;
- and,
- controlling the multiple traction motors based on the one of said multiple combinations of individual traction motor torques having the lowest aggregate power loss.
2 more elements
Dependencies are inferred from the claim text.