Optimal selection of input torque with stability of power flow for a hybrid electric vehicle
First Claim
Patent Images
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 substantially minimum system power loss; and
,establishing the preferred operating point as the value corresponding to the substantially minimum system power loss.
25 Assignments
0 Petitions
Accused Products
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.
78 Citations
21 Claims
-
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 substantially minimum system power loss; and
,establishing the preferred operating point as the value corresponding to the substantially minimum system power loss. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. 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:
-
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 (11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A hybrid powertrain system comprising:
-
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 (20, 21)
-
Specification