Methods, systems, and vehicles with electromechanical variable transmission
First Claim
1. A method of operating a first motor/generator and a second motor/generator in a vehicle drive, the first motor/generator electrically coupled to the second motor/generator 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 motor/generator as a generator when a speed of the first motor/generator is above a threshold speed, wherein the first motor/generator provides electrical power to the DC bus to maintain a first voltage on the DC bus when operated as a generator, and wherein the first motor/generator provides all of an electrical power required by the second motor/generator and an electrical power required to offset electrical power losses; and
operating the second motor/generator as a motor when the speed of the first motor/generator is above the threshold speed, wherein the second motor/generator consumes electrical power from the DC bus when operated as a motor, and wherein a sum of the electrical power provided by the first motor/generator, the electrical power losses, and the electrical power consumed by the second motor/generator is zero;
wherein the first motor/generator provides electrical power to the DC bus and the second motor/generator 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 second motor/generator as a generator when the speed of the first motor/generator is below the threshold speed, wherein the second motor/generator provides electrical power to the DC bus to maintain a second voltage on the DC bus when operated as a generator, and wherein the second motor/generator provides all of the electrical power required by the first motor/generator and the electrical power required to offset electrical power losses; and
operating the first motor/generator as a motor when the speed of the first motor/generator is below the threshold speed, wherein the first motor/generator consumes electrical power from the DC bus when operated as a motor, and wherein the sum of the electrical power provided by the second motor/generator, the electrical power losses, and the electrical power consumed by the first motor/generator is zero;
wherein the second motor/generator provides electrical power to the DC bus and the first motor/generator 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.
2 Assignments
0 Petitions
Accused Products
Abstract
One embodiment provides a method of operating a first motor/generator and a second motor/generator in a vehicle drive. The first motor/generator is electrically coupled to the second motor/generator by a DC bus. The vehicle drive is configured to propel a vehicle. The method includes operating the first motor/generator as a generator, providing electrical power to the DC bus. The first motor/generator provides the electrical power required by the second motor/generator and the electrical power required to offset losses. The method also includes operating the second motor/generator as a motor, consuming electrical power from the DC bus. The sum of the electrical power provided, the electrical power losses, and the electrical power consumed is zero. The first motor/generator provides electrical power and the second motor/generator consumes electrical power without providing electrical power to an energy storage device or consuming electrical power from an energy storage device.
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Citations
12 Claims
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1. A method of operating a first motor/generator and a second motor/generator in a vehicle drive, the first motor/generator electrically coupled to the second motor/generator by a DC bus and the vehicle drive configured to propel a vehicle, the method comprising:
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operating the vehicle drive in a first operating mode by; operating the first motor/generator as a generator when a speed of the first motor/generator is above a threshold speed, wherein the first motor/generator provides electrical power to the DC bus to maintain a first voltage on the DC bus when operated as a generator, and wherein the first motor/generator provides all of an electrical power required by the second motor/generator and an electrical power required to offset electrical power losses; and operating the second motor/generator as a motor when the speed of the first motor/generator is above the threshold speed, wherein the second motor/generator consumes electrical power from the DC bus when operated as a motor, and wherein a sum of the electrical power provided by the first motor/generator, the electrical power losses, and the electrical power consumed by the second motor/generator is zero; wherein the first motor/generator provides electrical power to the DC bus and the second motor/generator 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 second motor/generator as a generator when the speed of the first motor/generator is below the threshold speed, wherein the second motor/generator provides electrical power to the DC bus to maintain a second voltage on the DC bus when operated as a generator, and wherein the second motor/generator provides all of the electrical power required by the first motor/generator and the electrical power required to offset electrical power losses; and operating the first motor/generator as a motor when the speed of the first motor/generator is below the threshold speed, wherein the first motor/generator consumes electrical power from the DC bus when operated as a motor, and wherein the sum of the electrical power provided by the second motor/generator, the electrical power losses, and the electrical power consumed by the first motor/generator is zero; wherein the second motor/generator provides electrical power to the DC bus and the first motor/generator 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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for operating a first motor/generator and a second motor/generator in a vehicle drive, the first motor/generator electrically coupled to the second motor/generator by a DC bus and the vehicle drive configured to propel a vehicle, the system comprising a processing circuit configured to:
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operate the vehicle drive in a first operating mode and thereby; operate the first motor/generator as a generator when a speed of the first motor/generator is above a threshold speed, wherein the first motor/generator provides electrical power to the DC bus to maintain a first voltage on the DC bus when operated as a generator, and wherein the first motor/generator provides all of an electrical power required by the second motor/generator and an electrical power required to offset electrical power losses; and operate the second motor/generator as a motor when the speed of the first motor/generator is above the threshold speed, wherein the second motor/generator consumes electrical power from the DC bus when operated as a motor, and wherein a sum of the electrical power provided by the first motor/generator, the electrical power losses, and the electrical power consumed by the second motor/generator is zero; wherein the first motor/generator provides electrical power to the DC bus and the second motor/generator 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 operate the vehicle drive in a second operating mode and thereby; operate the second motor/generator as a generator when the speed of the first motor/generator is below the threshold speed, wherein the second motor/generator provides electrical power to the DC bus to maintain a second voltage on the DC bus when operated as a generator, and wherein the second motor/generator provides all of the electrical power required by the first motor/generator and the electrical power required to offset electrical power losses; and operate the first motor/generator as a motor when the speed of the first motor/generator is below the threshold speed, wherein the first motor/generator consumes electrical power from the DC bus when operated as a motor, and wherein the sum of the electrical power provided by the second motor/generator, the electrical power losses, and the electrical power consumed by the first motor/generator is zero; wherein the second motor/generator provides electrical power to the DC bus and the first motor/generator 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. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification