System constraints method of determining minimum and maximum torque limits for an electro-mechanical powertrain system
First Claim
1. A method for controlling an electro-mechanical transmission coupled to first and second electric machines to transmit mechanical power to an output member, wherein a control module performs the following steps comprising:
- determining minimum and maximum motor torque constraints for the first and second electric machines;
determining battery power constraints;
identifying one of a first, a second and a third case based upon the minimum and maximum motor torque constraints for the first and second electric machines relative to the battery power constraints, wherein the first, second and third cases are each associated with a relationship between the minimum and maximum motor torque constraints for the first and second electric machines and the battery power constraints;
selecting one of a plurality of zones associated with the identified one of the first, second and third case;
determining at least one output torque for the selected zone based upon the minimum and maximum motor torque constraints and the battery power constraints;
selecting a preferred output torque for the selected zone comprising one of the output torques for the selected zone determined based upon the minimum and maximum motor torque constraints and the battery power constraints; and
controlling operation of the electro-mechanical transmission and the first and second electric machines to transmit the preferred output torque to the output member of the electro-mechanical transmission.
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Abstract
A powertrain including 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 is disclosed. A method for controlling the electro-mechanical transmission includes determining minimum and maximum motor torque constraints for the first and second electric machines, and determining available battery power in terms of battery power constraints. One of a first, a second and a third case is determined based upon the motor torque constraints and the battery power constraints. A preferred output torque is determined for transmitting to the output member of the electro-mechanical transmission.
209 Citations
27 Claims
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1. A method for controlling an electro-mechanical transmission coupled to first and second electric machines to transmit mechanical power to an output member, wherein a control module performs the following steps comprising:
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determining minimum and maximum motor torque constraints for the first and second electric machines; determining battery power constraints; identifying one of a first, a second and a third case based upon the minimum and maximum motor torque constraints for the first and second electric machines relative to the battery power constraints, wherein the first, second and third cases are each associated with a relationship between the minimum and maximum motor torque constraints for the first and second electric machines and the battery power constraints; selecting one of a plurality of zones associated with the identified one of the first, second and third case; determining at least one output torque for the selected zone based upon the minimum and maximum motor torque constraints and the battery power constraints; selecting a preferred output torque for the selected zone comprising one of the output torques for the selected zone determined based upon the minimum and maximum motor torque constraints and the battery power constraints; and controlling operation of the electro-mechanical transmission and the first and second electric machines to transmit the preferred output torque to the output member of the electro-mechanical transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification