METHODS, SYSTEMS, AND VEHICLES WITH ELECTROMECHANICAL VARIABLE TRANSMISSION

摘要

A method of operating a first electric machine and a second electric machine in a vehicle drive includes operating the vehicle drive in: a first operating mode by operating the first electric machine in a voltage mode and the second electric machine in a torque mode; and a second operating mode by operating the first electric machine in the torque mode and the second electric machine in the voltage mode.

主权项

1. A method of operating a first electric machine and a second electric machine in a vehicle drive, the first electric machine electrically coupled to the second electric machine by a DC bus and the vehicle drive configured to propel a vehicle, the method comprising:
operating the vehicle drive in a first operating mode by:
operating the first electric machine in a voltage mode, wherein the first electric machine regulates electrical power at the DC bus to maintain a first voltage on the DC bus when operated in the voltage mode; andoperating the second electric machine in a torque mode, wherein the second electric machine consumes electrical power from the DC bus when operated in the torque mode;wherein a sum of the electrical power regulated by the first electric machine, the electrical power losses, and the electrical power consumed by the second electric machine is zero;wherein the first electric machine regulates electrical power at the DC bus and the second electric machine consumes electrical power from the DC bus without doing either of (a) providing electrical power to an energy storage device or (b) consuming electrical power from an energy storage device; and operating the vehicle drive in a second operating mode by:
operating the first electric machine in the torque mode, wherein the first electric machine consumes electrical power from the DC bus when operated in the torque mode; andoperating the second electric machine in the voltage mode, wherein the second electric machine regulates electrical power at the DC bus to maintain a second voltage on the DC bus when operated in the voltage mode;wherein a sum of the electrical power consumed by the first electric machine, the electrical power losses, and the electrical power regulated by the second electric machine is zero;wherein the first electric machine consumes electrical power from the DC bus and the second electric machine regulates electrical power at the DC bus without doing either of (a) providing electrical power to an energy storage device or (b) consuming electrical power from an energy storage device.