A method for controlling an operation of the gear mechanism of a motor vehicle having a freewheel device coupled to an electrical machine and configured to couple the electrical machine rotation speed-dependently to an output of the freewheel device or decouple it therefrom. The gear mechanism depending on a state change signal, starting from a decoupled state of the freewheel device, is operated in a pre-synchronization phase in which the rotation speed of the electrical machine is regulated to a target rotation speed, in particular below an actual rotation speed of the output, and on reaching a nominal rotation speed below the target rotation speed, a coupling phase is implemented in which the target rotation speed is increased and the transition to the coupled state of the freewheel device is performed.

A hydraulic control device for an automatic transmission, wherein when the first switching valve is switched to the first state while the second switching valve is in the third state, the reverse range pressure applied from the reverse range pressure input port of the second switching valve can be supplied from the first output port to the hydraulic servo for the first friction engagement element via the fourth output port of the second switching valve and the first input port of the first switching valve, and when a shift range is shifted from a neutral range to a reverse range, the second switching valve is in the fourth state, and the first switching valve is switched from the first state to the second state, so that the reverse range pressure applied to the reverse range pressure input port is cut off by the second switching valve.

This invention provides a control apparatus for an automatic transmission, which includes a plurality of engaging mechanisms. The plurality of engaging mechanisms includes a mechanical engaging mechanism configured to function as a brake. The mechanical engaging mechanism can be switched between a first state in which rotation of a rotational element is restricted only in one direction and a second state in which the rotation is restricted in both directions. When switching from the first state to the second state, the control apparatus executes engagement control to set a plurality of hydraulic friction engaging mechanisms in an engaging state. Control to set a predetermined hydraulic friction engaging mechanism in a half-engaging state and brake an output member can be executed in parallel to the engagement control.

An engagement device includes: an engaged portion disposed rotatably about a rotating shaft and configured to rotate in conjunction with the rotating shaft; an engaging portion disposed coaxially with the engaged portion and configured to perform engagement with the engaged portion and release from the engagement with the engaged portion by shifting in an axial direction; a control unit configured to control rotation of the engaged portion and shifting of the engaging portion in the axial direction; and a one-way clutch disposed on a power transmission path from the rotating shaft to a coupling member coupled to the engaging portion. The control unit is configured to rotate the engaged portion in an idling direction of the one-way clutch, at a time of performing engagement or release of the engaging portion with or from the engaged portion.

This invention provides a control apparatus for an automatic transmission, which includes a plurality of engaging mechanisms. The plurality of engaging mechanisms includes a mechanical engaging mechanism configured to function as a brake. The mechanical engaging mechanism can be switched between a first state in which rotation of a rotational element is restricted only in one direction and a second state in which the rotation is restricted in both directions. When switching from the first state to the second state, the control apparatus executes engagement control to set a plurality of hydraulic friction engaging mechanisms in an engaging state. Control to set a predetermined hydraulic friction engaging mechanism in a half-engaging state and brake an output member can be executed in parallel to the engagement control.

A transmission system for a vehicle, comprising a dynamic controllable clutch (DCC) and a friction clutch. The transmission system may further comprise a controller comprising instructions stored in non-transitory memory that are executable by the controller to adjust a state of the DCC and a state of the friction clutch to selectively engage a first gear ratio and a second gear ratio for providing torque transfer from an input to an output of the transmission system.