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 first and second torque machines and an energy storage device connected thereto, the hybrid transmission operative to transfer power between an input member and an output member and the first and second torque machines 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 first and second torque machines;
determining a first relationship comprising linear output torque constraints correlated to the motor torque constraints for the first and second torque machines and clutch reactive torque constraints;
determining a second relationship comprising quadratic output torque constraints correlated to 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
simultaneously solving the first and second relationships to determine an output torque to the output member responsive to the preferred output torque and achievable within the linear output torque constraints and the quadratic output torque constraints.
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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
17 Claims
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1. Method for controlling a hybrid transmission including first and second torque machines and an energy storage device connected thereto, the hybrid transmission operative to transfer power between an input member and an output member and the first and second torque 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 energy storage device and an output torque of the transmission; determining power constraints from the energy storage device; determining motor torque constraints for the first and second torque machines; determining a first relationship comprising linear output torque constraints correlated to the motor torque constraints for the first and second torque machines and clutch reactive torque constraints; determining a second relationship comprising quadratic output torque constraints correlated to 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 simultaneously solving the first and second relationships to determine an output torque to the output member responsive to the preferred output torque and achievable within the linear output torque constraints and the quadratic output torque constraints. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Method for controlling an electro-mechanical transmission including first and second electric machines and an electrical energy storage device connected thereto, the electro-mechanical transmission operative to transfer power between an input member and an output member and the first and second electric machines, 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 relationship comprising output torque constraints corresponding to the motor torque constraints for the first and second electric machines and clutch reactive torque constraints; determining a second relationship comprising output torque constraints corresponding to 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 simultaneously solving the first and second relationships to determine an output torque responsive to the preferred operator torque request and achievable in response to 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 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. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. Method for controlling a hybrid transmission including electric machines and an energy storage device connected thereto, the electro-mechanical transmission operative 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 first 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 a first relationship including maximum and minimum linear output torque constraints correlated to the motor torque constraints for the electric machines and clutch reactive torque constraints; determining a second relationship including maximum and minimum quadratic output torque constraints correlated to the power constraints from the energy storage device and the first relationship between the power from the energy storage device and the output torque of the transmission device; and simultaneously solving the first relationship and the second relationship to determine an output torque responsive to the preferred output torque and achievable within the maximum and minimum linear torque constraints and the maximum and minimum quadratic output torque constraints.
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Specification