System constraints method of controlling operation of an electro-mechanical transmission with two external input torque ranges
First Claim
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1. A method for controlling an electro-mechanical transmission operatively coupled to first and second electric machines to transmit power to an output member, the method comprising:
- determining motor torque constraints for the first and second electric machines;
determining battery power constraints for an electrical energy storage device electrically connected to the first and second electric machines;
determining a range for a first torque input to the electro-mechanical transmission;
determining a range for a second torque input to the electro-mechanical transmission;
determining a preferred output torque to the output member of the electro-mechanical transmission that is achievable within the motor torque constraints, is achievable within the range for the first torque input, is achievable within the range for the second torque input, and is based upon the battery power constraints; and
controlling operation of the electro-mechanical transmission and the first and second electric machines to achieve the preferred output torque to the output member of the electro-mechanical transmission;
wherein determining the preferred output torque comprises;
formulating mathematical equations representing the motor torque constraints comprising maximum and minimum motor torque constraints for the first and second electric machines;
formulating mathematical equations representing maximum and minimum battery power constraints;
formulating a mathematical equation representing the output torque;
formulating mathematical equations representing the range for the first torque input;
formulating mathematical equations representing the range for the second torque input;
transforming the mathematical equations representing the maximum and minimum battery power constraints to equations of concentric circles having respective radii;
transforming the mathematical equations representing the maximum and minimum motor torque constraints for the first and second electric machines to equations comprising lines;
transforming the mathematical equations representing the range for the first torque input to equations comprising lines;
transforming the mathematical equations representing the range for the second torque input to equations comprising lines;
transforming the mathematical equation representing the output torque to an equation comprising a line;
determining at least one transformed achievable output torque based upon the transformed mathematical equations representing the maximum and minimum motor torque constraints for the first and second electric machines, the maximum and minimum battery power constraints, the range for the first torque input and the range for the second torque input;
determining a transformed achievable maximum output torque corresponding to the at least one transformed achievable output torque; and
retransforming the transformed achievable maximum output torque as the preferred output torque to the output member.
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Abstract
A method to control an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and first and second electric machines to transmit power to an output member includes determining motor torque constraints and battery power constraints. A preferred output torque to an output member is determined that is achievable within the motor torque constraints and is achievable within a range for a first torque input and is achievable within a range for a second torque input and is based upon the battery power constraints.
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Citations
12 Claims
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1. A method for controlling an electro-mechanical transmission operatively coupled to first and second electric machines to transmit power to an output member, the method comprising:
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determining motor torque constraints for the first and second electric machines; determining battery power constraints for an electrical energy storage device electrically connected to the first and second electric machines; determining a range for a first torque input to the electro-mechanical transmission; determining a range for a second torque input to the electro-mechanical transmission; determining a preferred output torque to the output member of the electro-mechanical transmission that is achievable within the motor torque constraints, is achievable within the range for the first torque input, is achievable within the range for the second torque input, and is based upon the battery power constraints; and controlling operation of the electro-mechanical transmission and the first and second electric machines to achieve the preferred output torque to the output member of the electro-mechanical transmission; wherein determining the preferred output torque comprises; formulating mathematical equations representing the motor torque constraints comprising maximum and minimum motor torque constraints for the first and second electric machines; formulating mathematical equations representing maximum and minimum battery power constraints; formulating a mathematical equation representing the output torque; formulating mathematical equations representing the range for the first torque input; formulating mathematical equations representing the range for the second torque input; transforming the mathematical equations representing the maximum and minimum battery power constraints to equations of concentric circles having respective radii; transforming the mathematical equations representing the maximum and minimum motor torque constraints for the first and second electric machines to equations comprising lines; transforming the mathematical equations representing the range for the first torque input to equations comprising lines; transforming the mathematical equations representing the range for the second torque input to equations comprising lines; transforming the mathematical equation representing the output torque to an equation comprising a line; determining at least one transformed achievable output torque based upon the transformed mathematical equations representing the maximum and minimum motor torque constraints for the first and second electric machines, the maximum and minimum battery power constraints, the range for the first torque input and the range for the second torque input; determining a transformed achievable maximum output torque corresponding to the at least one transformed achievable output torque; and retransforming the transformed achievable maximum output torque as the preferred output torque to the output member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for controlling an electro-mechanical transmission operatively coupled to first and second electric machines to transmit mechanical power to an output member, the method comprising:
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determining motor torque constraints for the first and second electric machines; determining battery power constraints for an electrical energy storage device electrically connected to the first and second electric machines; determining a range for a first torque input to the electro-mechanical transmission; determining a range for a second torque input to the electro-mechanical transmission; formulating mathematical equations representing the motor torque constraints for the first and second electric machines, the battery power constraints, the output torque, the range for the first torque input, and the range for the second torque input; transforming the mathematical equations representing the battery power constraints to equations of concentric circles having respective radii and transforming the mathematical equations representing the motor torque constraints for the first and second electric machines, the output torque, the range for the first torque input, and the range for the second torque input to equations comprising lines; simultaneously solving the said transformed mathematical equations to determine at least one transformed achievable output torque; and retransforming the transformed achievable output torque to determine a preferred output torque to the output member of the electro-mechanical transmission that is achievable within the motor torque constraints, is achievable within the range for the first torque input, is achievable within the range for the second torque input, and is based upon the battery power constraints.
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Specification