Output split electrically-variable transmission with electric propulsion using one or two motors
First Claim
1. An electrically-variable transmission (EVT) comprising:
- an input member configured for operative interconnection with an engine;
an output member;
a stationary member;
first and second motor/generators;
a planetary gear set representable by a first three-node lever having a first, a second, and a third node; and
a first and a second torque-transmitting mechanism that are selectively engagable alone or in different combinations for establishing an electric-only mode, a series mode, an output split mode, and a neutral mode, wherein said first torque-transmitting mechanism is selectively engagable to connect said third node to said stationary member, and wherein said second torque-transmitting mechanism is selectively engagable to connect said first motor/generator to said third node;
wherein one of said first and said second torque-transmitting mechanisms is selectively disengagable to disconnect said engine from said third node to enable start of said engine when said engine is disconnected from said EVT; and
wherein engagement of said first torque-transmitting mechanism establishes said electric-only mode and said series mode, engagement of said second torque-transmitting mechanism establishes said output split mode, and disengagement of said first and said second torque-transmitting mechanisms establishes said neutral mode.
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Accused Products
Abstract
An electrically-variable transmission is provided with input member and output member, first and second motor/generators, a first planetary gear set and a final drive gearset. Two or three torque-transmitting mechanisms that are selectively engagable alone or in different combinations to establish at least one forward electric-only operating mode including a series mode, an output split mode, and at least one neutral mode including a purely neutral mode and a neutral battery charge mode. The transmission optionally includes a one-way clutch selected from the group of friction clutch and dog clutch, or is a lockable one-way clutch, for enabling low loss forward operation, regenerative braking functionality, and/or reverse vehicle operation.
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Citations
21 Claims
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1. An electrically-variable transmission (EVT) comprising:
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an input member configured for operative interconnection with an engine; an output member; a stationary member; first and second motor/generators; a planetary gear set representable by a first three-node lever having a first, a second, and a third node; and a first and a second torque-transmitting mechanism that are selectively engagable alone or in different combinations for establishing an electric-only mode, a series mode, an output split mode, and a neutral mode, wherein said first torque-transmitting mechanism is selectively engagable to connect said third node to said stationary member, and wherein said second torque-transmitting mechanism is selectively engagable to connect said first motor/generator to said third node; wherein one of said first and said second torque-transmitting mechanisms is selectively disengagable to disconnect said engine from said third node to enable start of said engine when said engine is disconnected from said EVT; and wherein engagement of said first torque-transmitting mechanism establishes said electric-only mode and said series mode, engagement of said second torque-transmitting mechanism establishes said output split mode, and disengagement of said first and said second torque-transmitting mechanisms establishes said neutral mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A hybrid powertrain having an electrically-variable transmission (EVT), the hybrid powertrain comprising:
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an engine; an input member; an output member; a stationary member; first and second motor/generators; an energy storage device operatively connected to each of said first and said second motor/generators for providing power to and receiving power from said first and second motor/generators, wherein said energy storage device is configured to be operatively connectable with an offboard power supply for recharging said energy storage device; and a first planetary gear set representable by a first three-node lever of a lever diagram having a first node, a second node, and a third node; wherein said first motor/generator and said input member are selectively connectable with said third node, said second motor/generator is continuously connected with said first node, and said second node is continuously connected for common rotation with said output member; a first torque-transmitting mechanism selectively engagable to connect said third node to said stationary member; and a second torque-transmitting mechanism selectively engagable to connect said first motor/generator with said third node; wherein engagement of selected ones of said first and said second torque-transmitting mechanisms alone or in different combinations establishes a forward electric-only mode, a series mode, an output split mode, and a neutral mode. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A hybrid powertrain comprising:
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an engine; an electrically-variable transmission having an input member and output member, said input member being selectively connectable to said engine; a stationary member; first and second motor/generators; an energy storage device operatively connected to each of said first and said second motor/generators for providing power to and receiving power from said first and second motor/generators, wherein said energy storage device is configured to be operatively connectable with an offboard power supply for recharging said energy storage device; a first planetary gear set representable by a first three-node lever of a lever diagram having a first node, a second node, and a third node; a first torque-transmitting mechanism selectively engagable to connect said third node to said stationary member; a second torque-transmitting mechanism selectively engagable to connect said first motor/generator with said third node; a third torque-transmitting mechanism selectively engagable to connect said engine with said first motor/generator, wherein engagement of said first, said second, and said third torque-transmitting mechanism alone or in different combinations establishes six operating modes including a one-motor electric-only mode in which said engine is normally off, a series mode in which said engine is normally on, an output split mode, a neutral mode, a neutral battery charge mode, and a two-motor electric-only mode in which the engine is normally off; wherein said first motor/generator and said input member are selectively connectable with said third node via said second torque-transmitting mechanism, said second motor/generator is continuously connected with said first node, and said second node is continuously connected for common rotation with said output member; and wherein engagement of said first torque-transmitting mechanisms and disengagement of said second torque transmitting mechanism establishes an electric-only mode in which said input member does not rotate and said second motor/generator acts as a motor utilizing power from the recharged said energy storage device to provide driving torque at said output member. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification