Optimal selection of input torque considering battery utilization for a hybrid electric vehicle
First Claim
Patent Images
1. Method for determining a preferred input torque for operating an electrically variable transmission (EVT) including an input, an output and an electric machine having known coupling relationships, and an energy storage system (ESS), comprising:
- determining current EVT operating conditions including input, output and electric machine speeds;
determining system constraints in electric machine torque, ESS power and input torque at current EVT operating conditions;
providing a target output torque producible within said system constraints;
calculating aggregate system power losses corresponding to feasible input torques that can produce the target output torque within said system constraints;
calculating ESS power utilization costs as a function of ESS power corresponding to feasible input torques, wherein the ESS power utilization costs are adapted for application to the aggregate system power losses;
applying the ESS power utilization costs to the aggregate system power losses to determine total system 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 total system loss; and
selecting as the preferred input torque the feasible input torque corresponding to the substantially minimum total system loss.
12 Assignments
0 Petitions
Accused Products
Abstract
A 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. System power losses and battery utilization costs are calculated at feasible input torques and a solution for the input torque corresponding to the minimum total powertrain system loss is converged upon to determine the preferred input torque.
-
Citations
16 Claims
-
1. Method for determining a preferred input torque for operating an electrically variable transmission (EVT) including an input, an output and an electric machine having known coupling relationships, and an energy storage system (ESS), comprising:
-
determining current EVT operating conditions including input, output and electric machine speeds; determining system constraints in electric machine torque, ESS power and input torque at current EVT operating conditions; providing a target output torque producible within said system constraints; calculating aggregate system power losses corresponding to feasible input torques that can produce the target output torque within said system constraints; calculating ESS power utilization costs as a function of ESS power corresponding to feasible input torques, wherein the ESS power utilization costs are adapted for application to the aggregate system power losses; applying the ESS power utilization costs to the aggregate system power losses to determine total system 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 total system loss; and selecting as the preferred input torque the feasible input torque corresponding to the substantially minimum total system loss. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
Specification