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US 8,556,765 B2Granted
Multi-speed transmission with an engine start/stop enabler
AssigneeGM Global Technology Operations LLC
InventorsCasie M. Bockenstette, Robert L. Moses, Carlos E. Marin, Zhen J. Zhang
Life of this patent
Estimating the term…
Abstract
A transmission includes an input member, an output member, a plurality of torque-transmitting mechanisms that are selectively engageable to establish at least four forward speed ratios and at least one reverse speed ratio between the input member and the output member, and one or more latches associated with one or more of the torque-transmitting mechanisms. The one or more latches engages the respective torque-transmitting mechanisms during or prior to a start event.
Claims20
A transmission comprising:
- an input member;
- an output member;
- first, second, third and fourth planetary gear sets each having first, second and third members;
- a plurality of torque-transmitting mechanisms, a first torque-transmitting mechanism of the plurity of torque-transmitting mechanisms being selectively engageable to interconnect the first member of the first planetary gear set to a stationary member and a second torque-transmitting mechanism of the plurality of torque-transmitting mechanisms being selectively engageable to interconnect the third member of the first planetary gear set to the stationary member, the plurality of torque-transmitting mechanisms being engageable to establish at least four forward speed ratios and at least one reverse speed ratio between the input member and the output member;
- and
- one or more latches associated with one or more of the torque-transmitting mechanisms, wherein the one or more latches engages the respective torque-transmitting mechanisms during or prior to a start event.
3 more elements
A transmission comprising:
- an input member;
- an output member;
- first, second, third and fourth planetary gear sets each having first, second and third members;
- a plurality of torque-transmitting mechanisms, a first torque-transmitting mechanism of the plurality of torque-transmitting mechanisms being selectively engageable to interconnect the first member of the first planetary gear set to a stationary member and a second torque-transmitting mechanism of the plurality of torque-transmitting mechanisms being selectively engageable to interconnect the third member of the first planetary gear seat to the stationary member, the plurality of torque-transmitting mechanisms being selectively engageable to establish at least eight forward speed ratios and at least one reverse speed ratio between the input member and the output member;
- a plurality of latches associated with two of the torque-transmitting mechanisms, wherein the plurality of latches engages the respective torque-transmitting mechanisms during or prior to a start event;
- a plurality of variable force solenoids, at least one of the plurality of variable force solenoids being in communication with a respective force-transmitting mechanism to moderate the fluid volume to the torque transmitting mechanism;
- and
- a controller that provides instructions to the plurality of variable force solenoids.
5 more elements
Dependencies are inferred from the claim text.