Optimal selection of input torque with stability of power flow for a hybrid electric vehicle
First Claim
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1. Method for establishing a preferred operating point for a preselected powertrain operating parameter in a powertrain system, comprising:
- determining a feasible operating space for the preselected powertrain operating parameter;
searching the feasible operating space for a value corresponding to a minimum system power loss; and
, establishing the preferred operating point as the value corresponding to the minimum system power loss.
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Abstract
An preferred input torque for a hybrid powertrain is determined within a solution space of feasible input torques in accordance with a plurality of powertrain system constraints that results in a minimum overall powertrain system loss. Aggregate powertrain system losses are calculated at feasible input torques and a solution for the input torque corresponding to the minimum aggregate powertrain system loss is converged upon to determine the preferred input torque.
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Citations
21 Claims
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1. Method for establishing a preferred operating point for a preselected powertrain operating parameter in a powertrain system, comprising:
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determining a feasible operating space for the preselected powertrain operating parameter;
searching the feasible operating space for a value corresponding to a minimum system power loss; and
,establishing the preferred operating point as the value corresponding to the minimum system power loss. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 21)
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9. Method for determining a preferred input torque for efficiently operating an electrically variable transmission including an input, an output and an electric machine having known coupling relationships, and an energy storage system, comprising:
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determining current EVT operating conditions including input, output and electric machine speeds;
determining system constraints in electric machine torque, battery power and input torque at current EVT operating conditions;
providing a target output torque producible within said system constraints;
calculating aggregate power losses corresponding to feasible input torques that can produce the target output torque within said system constraints;
converging upon a feasible input torque corresponding to a substantially minimum aggregate power loss; and
,selecting as the preferred input torque the feasible input torque corresponding to the substantially minimum aggregate power loss. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A hybrid powertrain system comprising:
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an engine;
an electric machine;
an energy storage system;
an output;
wherein the energy storage system and electric machine are electrically-operatively coupled for power flow therebetween, and wherein the engine, electric machine and output are mechanically-operatively coupled for power flow therebetween; and
a computer based controller including a storage medium having a computer program encoded therein for determining an engine torque at predetermined engine speed and output speed conditions that result in a substantially minimum powertrain power loss, said computer program including code for determining a feasible operating space for engine torque; and
,code for searching the feasible operating space for a value of engine torque corresponding to a substantially minimum powertrain system power loss. - View Dependent Claims (19, 20)
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Specification