Hybrid Powertrain with Efficient Electric-Only Mode
First Claim
1. A hybrid electromechanical transmission connectable with a power source, comprising:
- an input member connected with the power source;
an output member;
a planetary gear set having a first, a second, and a third member;
first and second motor/generators;
a battery operatively connected to the motor/generators for receiving power therefrom and delivering power thereto;
wherein the input member is operatively connected with the first member;
wherein the first motor/generator is operatively connected for rotation with the second member;
wherein the second motor/generator is operatively connected for rotation with the output member;
a first torque-transmitting mechanism engagable to connect the second motor/generator for rotation with the third member; and
wherein the battery and second motor/generator provide an electric-only operating mode to power the output member when the first torque-transmitting mechanism is not engaged;
the power source, planetary gear set and first motor/generator thereby being disconnected from the output member during the electric-only operating mode to prevent parasitic drag.
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Accused Products
Abstract
A hybrid powertrain includes a hybrid electromechanical transmission and a power source. A planetary gear set having a first, a second, and a third member connects the power source with a first and a second motor/generator. A battery is operatively connected to the motor/generators for receiving power therefrom and delivering power thereto. An input member rotates with the first member, the first motor/generator rotates with the second member, and the second motor/generator rotates with the output member. A first torque-transmitting mechanism is engagable to connect the second motor/generator for rotation with the third member. The battery and the second motor/generator provide an electric-only operating mode to power the output member when the first torque-transmitting mechanism is not engaged; the power source, planetary gear set and first motor/generator thereby being disconnected from the output member during the electric-only operating mode to prevent parasitic drag.
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Citations
15 Claims
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1. A hybrid electromechanical transmission connectable with a power source, comprising:
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an input member connected with the power source; an output member; a planetary gear set having a first, a second, and a third member; first and second motor/generators; a battery operatively connected to the motor/generators for receiving power therefrom and delivering power thereto; wherein the input member is operatively connected with the first member;
wherein the first motor/generator is operatively connected for rotation with the second member;wherein the second motor/generator is operatively connected for rotation with the output member; a first torque-transmitting mechanism engagable to connect the second motor/generator for rotation with the third member; and wherein the battery and second motor/generator provide an electric-only operating mode to power the output member when the first torque-transmitting mechanism is not engaged;
the power source, planetary gear set and first motor/generator thereby being disconnected from the output member during the electric-only operating mode to prevent parasitic drag. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A hybrid powertrain comprising:
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an engine; an electrically-variable transmission having; an input member connected for rotation with the engine; an output member; a stationary member; a planetary gear set having a ring gear member, a sun gear member, and a carrier member rotatably supporting a plurality of pinion gears that intermesh with both the ring gear member and the sun gear member; first and second motor/generators;
wherein the first motor/generator is operatively connected for rotation with the sun gear member;
wherein the second motor/generator is operatively connected for rotation with the output member;a battery operatively connected to the first and second motor/generators for receiving power therefrom and delivering power thereto;
wherein the battery is configured to be operatively connectable to an offboard power supply for recharging the battery;a one-way clutch engagable to interconnect the ring gear member and the output member;
wherein the one-way clutch automatically engages when the ring gear member rotates in a forward direction and overruns when the ring gear member does not rotate;a torque-transmitting mechanism engagable to ground the ring gear member to the stationary housing; wherein the battery and the second motor/generator provide an electric-only operating mode when the one-way clutch is not engaged and the engine is off, the one-way clutch thus disconnecting the planetary gear set, the engine, and the first motor/generator from the output member during the electric-only operating mode; wherein the engine, the battery, and the second/motor/generator provide an input-split operating mode when the engine is on, the one-way clutch is engaged, and the second torque-transmitting mechanism in not engaged; and wherein the engine, the first motor/generator, the battery, and the second motor/generator provide a series hybrid operating mode when the engine is on, the one-way clutch is not engaged, and the second torque-transmitting mechanism is engaged.
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10. A method of operating a hybrid electromechanical powertrain having an engine, a transmission with a first motor/generator, a second motor/generator, and a planetary gear set;
- wherein the engine and the motor/generators are each connectable to different members of the planetary gear set, the method comprising;
providing a first engagable and disengagable torque-transmitting mechanism between the second motor/generator and the member of the planetary gear set connected with the second motor/generator; directing stored electrical power to the second motor/generator to drive a transmission output member to thereby establish an electric-only operating mode; and wherein the first torque-transmitting mechanism is disengaged during said directing such that the second motor/generator and output member are isolated from the engine, the planetary gear set, and the first motor/generator, thereby eliminating parasitic drag. - View Dependent Claims (11, 12, 13, 14, 15)
- wherein the engine and the motor/generators are each connectable to different members of the planetary gear set, the method comprising;
Specification