Transmission with selectable one-way clutch
AssigneeFord Global Technologies, LLC
InventorsDongdong Dee Li, Stephen Michael Cicala, Conor Edward Sullivan, Richard Reynolds Hathaway
Life of this patent
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Abstract
A vehicle transmission includes a plurality of friction clutches and a selectable one-way clutch. The transmission also includes a controller programmed to, in response to detecting a component fault, switch the selectable one-way clutch from a passive state to an active state by commanding engagement of a first subset of the friction clutches to establish a slip elimination state. The controller is also programmed to, following establishment of the slip elimination state, command the selectable one-way clutch to the active state.
Claims19
A vehicle transmission comprising:
- a plurality of friction clutches;
- a selectable one-way clutch;
- and
- a controller programmed to
- responsive to a component fault, command an engagement of a first subset of the friction clutches to establish a slip elimination state, then command the selectable one-way clutch to switch from a passive state to an active state, wherein in the passive state, the selectable one-way clutch prevents relative rotation between two components on each side in one direction while permitting relative rotation between the two components in an opposite direction, and wherein in the active state, the selectable one-way clutch prevents relative rotation between the two components in either direction, and
- after commanding the selectable one-way clutch to the active state, release a second subset of the first subset of friction clutches, wherein the second subset includes fewer clutches than the first subset.
A vehicle transmission comprising:
- a plurality of friction clutches;
- an output brake;
- a selectable one-way clutch;
- and
- a controller programmed to switch the selectable one-way clutch from a passive state to an active state, responsive to a component fault, by commanding engagement of the output brake and a first subset of the friction clutches to establish a slip elimination state, then commanding the selectable one-way clutch to the active state, wherein in the passive state, the selectable one-way clutch prevents relative rotation between two components on each side in one direction while permitting relative rotation between the two components in an opposite direction, and wherein in the active state the selectable one-way clutch prevents relative rotation between the two components in either direction.
A vehicle transmission comprising:
- a plurality of friction clutches;
- an output brake;
- a selectable one-way clutch;
- at least one speed sensor to output a signal indicative of a speed across the selectable one-way clutch;
- and
- a controller programmed to change state of the selectable one-way clutch by
- in an absence of a component fault, commanding the selectable one-way clutch from a passive state to an active state only after sensing the speed across the selectable one-way clutch is less than a predetermined threshold, wherein in the passive state, the selectable one-way clutch prevents relative rotation between two components on each side in one direction while permitting relative rotation between the two components in an opposite direction, and wherein in the active state, the selectable one-way clutch prevents relative rotation between the two components in either direction, and
- in response to detection of the component fault, commanding engagement of at least one of a first subset of the friction clutches and the output brake to establish a slip elimination state before commanding the selectable one-way clutch to the active state.
Dependencies are inferred from the claim text.