METHOD AND APPARATUS TO DETERMINE A PREFERRED OUTPUT TORQUE FOR OPERATING A HYBRID TRANSMISSION IN A CONTINUOUSLY VARIABLE MODE
First Claim
1. Method for controlling a hybrid transmission including a torque machine and an energy storage device connected thereto, the hybrid transmission operative to transfer power between an input member and an output member and the torque machine in a continuously variable operating range state, the method comprising:
- determining a preferred output torque;
determining a relationship between power from the energy storage device and an output torque of the transmission;
determining power constraints from the energy storage device;
determining motor torque constraints for the torque machine;
determining linear torque constraints to the output torque based upon the motor torque constraints for the torque machine;
determining quadratic output torque constraints based upon the power constraints from the energy storage device and the relationship between the power from the energy storage device and the output torque of the transmission device; and
determining an output torque to the output member responsive to the preferred output torque and achievable based upon the linear output torque constraints and the quadratic output torque constraints.
17 Assignments
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Accused Products
Abstract
A hybrid transmission includes a torque machine and an energy storage device connected thereto. The hybrid transmission is operative to transfer power between an input member and an output member and the torque machine in a continuously variable operating range state. A method for controlling the hybrid transmission includes determining a preferred output torque, determining a relationship between power from the energy storage device and an output torque of the transmission, determining power constraints from the energy storage device, determining motor torque constraints for the torque machine, determining linear torque constraints to the output torque based upon the motor torque constraints for the torque machine, determining quadratic output torque constraints based upon the power constraints from the energy storage device and the relationship between the power from the energy storage device and the output torque of the transmission device, and determining an output torque to the output member responsive to the preferred output torque and achievable based upon the linear output torque constraints and the quadratic output torque constraints.
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Citations
20 Claims
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1. Method for controlling a hybrid transmission including a torque machine and an energy storage device connected thereto, the hybrid transmission operative to transfer power between an input member and an output member and the torque machine in a continuously variable operating range state, the method comprising:
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determining a preferred output torque; determining a relationship between power from the energy storage device and an output torque of the transmission; determining power constraints from the energy storage device; determining motor torque constraints for the torque machine; determining linear torque constraints to the output torque based upon the motor torque constraints for the torque machine; determining quadratic output torque constraints based upon the power constraints from the energy storage device and the relationship between the power from the energy storage device and the output torque of the transmission device; and determining an output torque to the output member responsive to the preferred output torque and achievable based upon the linear output torque constraints and the quadratic output torque constraints. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Method for controlling an electromechanical transmission including first and second electric machines and an electrical energy storage device connected thereto, the electromechanical transmission operative to transfer power between an input member and an output member and the first and second electric machines in a continuously variable operating range state, the method comprising:
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determining a preferred output torque; determining a relationship between power from the electrical energy storage device and an output torque transmitted to the output member; determining power constraints from the electrical energy storage device; determining motor torque constraints for the first and second electric machines; determining a first output torque constraint based upon the motor torque constraints for the first and second electric machines; determining a second output torque constraint based upon the power constraints from the electrical energy storage device and the relationship between the power from the electrical energy storage device and the output torque; and determining an output torque responsive to the preferred operator torque request and achievable based upon the first and second output torque constraints. - View Dependent Claims (8, 9, 10, 11, 12)
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13. Method for controlling a hybrid transmission including electric machines and an energy storage device connected thereto, the electromechanical transmission operative in a continuously variable operating range state to transfer power between an input member and an output member and the electric machines, the method comprising:
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determining a preferred output torque; determining a relationship between power from the energy storage device and an output torque of the transmission; determining power constraints from the energy storage device; determining motor torque constraints for the electric machines; determining maximum and minimum linear output torque constraints based upon the motor torque constraints for the electric machines; determining maximum and minimum quadratic output torque constraints based upon the power constraints from the energy storage device and the relationship between the power from the energy storage device and the output torque of the transmission device; and determining an output torque responsive to the preferred operator torque request and achievable based upon the linear torque constraints and the quadratic output torque constraint. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification