Hybrid electrically variable transmission with geared reverse mode using single motor/generator
First Claim
1. A transmission for a vehicle with an engine comprising:
- an input member for receiving power from the engine;
an output member;
a motor/generator;
a differential gear set having a first, a second, a third and a fourth gear element operatively interconnected with one another;
wherein said input member and said motor/generator provide power to said output member via said first and second gear elements respectively;
a plurality of intermeshing gears including a reversing gear and gears connected for rotation with said output member;
a plurality of selectively engagable torque-transmitting mechanisms;
first and second concentric transfer shafts connected to said third and fourth gear elements, respectively, for common rotation at the same speed therewith, and each operatively connectable with said output member via different ones of said intermeshing gears by engagement of different selected ones of said torque-transmitting mechanisms, thereby forming selectable first and second power paths, respectively, between said third and fourth gear elements, respectively, and said output member; and
wherein the transmission provides multiple operating modes including an electrically variable reverse operating mode utilizing said reversing gear.
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Accused Products
Abstract
An electrically variable transmission having a single motor/generator provides electrically variable power flow along dual power paths and provides an electrically variable reverse operating mode. The transmission includes a compound differential gear set having at least four gear elements operatively interconnected with one another. A transmission input member and the single motor/generator selectively provide power to a transmission output member via the differential gear set. The transmission includes a plurality of intermeshing gears, including a reversing gear and gears connected for rotation with the output member, for operatively connecting the differential gear set with the output member. Torque-transmitting mechanisms are selectively engagable to provide power flow between the input member and the output member in multiple operating modes, including a parallel hybrid electrically variable reverse operating mode utilizing the reversing gear. A method of operating a transmission that allows shifting between different gearing portions of the transmission is provided.
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Citations
19 Claims
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1. A transmission for a vehicle with an engine comprising:
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an input member for receiving power from the engine; an output member; a motor/generator; a differential gear set having a first, a second, a third and a fourth gear element operatively interconnected with one another;
wherein said input member and said motor/generator provide power to said output member via said first and second gear elements respectively;a plurality of intermeshing gears including a reversing gear and gears connected for rotation with said output member; a plurality of selectively engagable torque-transmitting mechanisms; first and second concentric transfer shafts connected to said third and fourth gear elements, respectively, for common rotation at the same speed therewith, and each operatively connectable with said output member via different ones of said intermeshing gears by engagement of different selected ones of said torque-transmitting mechanisms, thereby forming selectable first and second power paths, respectively, between said third and fourth gear elements, respectively, and said output member; and wherein the transmission provides multiple operating modes including an electrically variable reverse operating mode utilizing said reversing gear. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A transmission for a vehicle with an engine comprising:
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an input member for receiving power from the engine; an output member; a motor/generator; a compound differential gear set having four gear elements operatively interconnected with one another;
wherein said input member is operatively connectable with a first of said gear elements, said motor/generator is operatively connectable with a second of said gear elements;first and second transfer members continuously connected with said third and fourth gear elements respectively to partially form first and second power paths, respectively, between said differential gear set and said output member; a plurality of intermeshing gears including a first gear set operatively connectable using a selectively engagable torque-transmitting mechanism to provide a speed ratio for forward rotation between said first transfer member and said output member, and a second gear set operatively connectable using another selectively engagable torque-transmitting mechanism to provide a speed ratio for reverse rotation between said second transfer member and said output member; and wherein said speed ratio for forward rotation and said speed ratio for reverse rotation are such that when said torque-transmitting mechanisms are both engaged, said input member is stationary while rotation and speed of said output member are determined by rotation and speed of said motor/generator. - View Dependent Claims (18)
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19. A method of operating a transmission having first and second power paths at least partially defined by first and second transfer shafts, each of said transfer shafts being operatively connectable to a countershaft via different sets of intermeshing gears establishing different gear ratios, wherein the transfer shafts and a transmission input member are each connected to different members of a differential gear set, the method comprising:
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slipping a first torque-transmitting mechanism connected to another member of the differential gear set to thereby alter a speed of rotation of the first transfer shaft; during said slipping, engaging a second torque-transmitting mechanism to connect a first gear for common rotation with the first transfer shaft to thereby transfer torque via said first power path through one of said sets of intermeshing gears; and during said slipping and after said engaging, disengaging a third torque-transmitting mechanism to disconnect a gear from common rotation with said second transfer shaft to thereby transfer torque via said second power path through another of said sets of intermeshing gears.
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Specification