Vehicle drive and method with electromechanical variable transmission
First Claim
1. A vehicle drive comprising:
- a gear set comprising a sun gear, a ring gear, and planetary gears, the planetary gears coupling the sun gear to the ring gear, wherein the planetary gears are rotatably supported by a planetary gear carrier;
a first motor/generator coupled to the sun gear of the gear set;
a second motor/generator selectively coupled to at least one of (a) the planetary gear carrier of the gear set and (b) the ring gear of the gear set, wherein the second motor/generator is electrically coupled to the first motor/generator by an electrical power transmission system, wherein the first motor/generator and the second motor/generator are electrically coupled without an energy storage device configured to at least one of (a) provide electrical energy to the first motor/generator or the second motor/generator to power the first motor/generator or the second motor/generator and (b) be charged by electrical energy from the first motor/generator or the second motor/generator;
an engine coupled to the ring gear of the gear set and selectively coupled to the second motor/generator;
a clutch configured to selectively engage the second motor/generator to the engine.
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Accused Products
Abstract
A vehicle drive includes a gear set, a first motor/generator coupled to a sun gear of the gear set, a second motor/generator selectively coupled to at least one of (a) a planetary gear carrier of the gear set and (b) a ring gear of the gear set, an engine coupled to the ring gear of the gear set and selectively coupled to the second motor/generator, and a clutch configured to selectively engage the second motor/generator to the engine. The first motor/generator and the second motor/generator are electrically coupled without an energy storage device configured to at least one of (a) provide electrical energy to the first motor/generator or the second motor/generator to power the first motor/generator or the second motor/generator and (b) be charged by electrical energy from the first motor/generator or the second motor/generator.
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Citations
18 Claims
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1. A vehicle drive comprising:
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a gear set comprising a sun gear, a ring gear, and planetary gears, the planetary gears coupling the sun gear to the ring gear, wherein the planetary gears are rotatably supported by a planetary gear carrier; a first motor/generator coupled to the sun gear of the gear set; a second motor/generator selectively coupled to at least one of (a) the planetary gear carrier of the gear set and (b) the ring gear of the gear set, wherein the second motor/generator is electrically coupled to the first motor/generator by an electrical power transmission system, wherein the first motor/generator and the second motor/generator are electrically coupled without an energy storage device configured to at least one of (a) provide electrical energy to the first motor/generator or the second motor/generator to power the first motor/generator or the second motor/generator and (b) be charged by electrical energy from the first motor/generator or the second motor/generator; an engine coupled to the ring gear of the gear set and selectively coupled to the second motor/generator; a clutch configured to selectively engage the second motor/generator to the engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A vehicle drive comprising:
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a gear set comprising a sun gear, a ring gear, and planetary gears, the planetary gears coupling the sun gear to the ring gear, wherein the planetary gears are rotatably supported by a planetary gear carrier; a first motor/generator coupled to the sun gear of the gear set; a second motor/generator selectively coupled to at least one of (a) the planetary gear carrier of the gear set and (b) the ring gear of the gear set, wherein the second motor/generator is electrically coupled to the first motor/generator by an electrical power transmission system, wherein the first motor/generator and the second motor/generator are electrically coupled without an energy storage device configured to at least one of (a) provide electrical energy to the first motor/generator or the second motor/generator to power the first motor/generator or the second motor/generator and (b) be charged by electrical energy from the first motor/generator or the second motor/generator; an engine coupled to the ring gear of the gear set and selectively coupled to the second motor/generator; and a controller including a processing circuit configured to; operate the engine at a calculated speed; operate one of the first motor/generator and the second motor/generator at a calculated torque; and operate the other of the first motor/generator and the second motor/generator to maintain a voltage on the electrical power transmission system. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification