A control device for a lock-up-clutch installed in a torque converter arranged between an engine and an automatic transmission mechanism includes an engagement control means that carries out a calculation to increase an engaging capacity of the lock-up-clutch with the passage of time during an engagement control time in which the torque converter is shifted from a converter condition to a lock-up condition in which the prime mover drives an auxiliary device and in which when, during the control to increase the engaging capacity of the lock-up-clutch, an input torque to the torque converter from the engine is increased due to reduction in load of the auxiliary device, the engagement control means promotes the increase of the engaging capacity of the lock-up-clutch based on the amount of increase of the input torque thereby eliminating undesired pressure shortage that would be induced in the period toward the lock-up condition.

A vehicle includes an engine, a continuously variable transmission and a torque converter that has a lock-up clutch. The torque converter is arranged between the engine and the continuously variable transmission. The vehicle further includes engine accessories such as an air conditioner compressor and alternator that are driven by the engine. In this vehicle, a slip control is executed that produces a predetermined slip rotational state by controlling a lock-up capacity of the lock-up clutch. During slip control of the lock-up clutch, the engine-equipped vehicle executes cooperative control that suppresses load fluctuations of engine accessories such as the air conditioner compressor and the alternator.

At least one electric motor is employed for propelling an electric or hybrid vehicle with a shiftable transmission. Upon reaching a shift threshold, a shift operation is performed in the transmission of the vehicle, wherein a value specifying the shift threshold is varied depending on at least one parameter. As the at least one parameter, a speed is used, at which a power provided by the at least one electric motor for propelling the vehicle has a maximum.

A SBW-ECU includes: a P unreleasable region determination portion configured to determine whether a road surface slope Sr at a vehicle position and an output voltage Volr of an auxiliary battery fall within a predetermined parking lock unreleasable region or not; and a P release request rejection portion configured to reject a P release request in a case where P release request rejection conditions to are all satisfied, including a fact that the P unreleasable region determination portion determines that the road surface slope Sr at the vehicle position and the output voltage Volr of the auxiliary battery fall within the parking lock unreleasable region (the P release request rejection condition (c) is satisfied).

Methods and systems are provided for an assembly comprising a first motor positioned on a first shaft, a second motor positioned on a second shaft, a first wet clutch selectively coupled to the first shaft, a second wet clutch selectively coupled to a drive axle, a third wet clutch selectively coupled to the first shaft, and a brake clutch fixed to a housing of the assembly. The assembly comprises a planetary gearset positioned on the second shaft having gears selectively coupled to the third wet clutch, the first wet clutch or to the brake clutch. The assembly comprises a first one-way clutch and a second one-way clutch opposing the first one-way clutch, the first one-way clutch and the second one-way clutch selectively coupled to the first shaft, where the first one-way clutch and the second one-way clutch are directly connected to two gear trains to drive a PTO shaft.

A control device for a lock-up-clutch installed in a torque converter arranged between an engine and an automatic transmission mechanism includes an engagement control means that carries out a calculation to increase an engaging capacity of the lock-up-clutch with the passage of time during an engagement control time in which the torque converter is shifted from a converter condition to a lock-up condition in which the prime mover drives an auxiliary device and in which when, during the control to increase the engaging capacity of the lock-up-clutch, an input torque to the torque converter from the engine is increased due to reduction in load of the auxiliary device, the engagement control means promotes the increase of the engaging capacity of the lock-up-clutch based on the amount of increase of the input torque thereby eliminating undesired pressure shortage that would be induced in the period toward the lock-up condition.

When an alternator load torque Talt is larger than a threshold , a lockup clutch is released. Thus, a deceleration G can be restrained from becoming too large due to the alternator load torque Talt. Besides, the threshold is changed in accordance with a speed ratio of a continuously variable transmission. Thus, the deceleration G can be favorably controlled within a predetermined range. For example, in a vehicle state where a deceleration is unlikely to be achieved due to the smallness of the speed ratio , the threshold is large. Therefore, the lockup clutch is unlikely to be released, and the deceleration G is likely to be secured.

A tractor is disclosed having an engine fitted with a speed governor, drive wheels, a transmission connecting the engine to the drive wheels, a controller serving to select the effective transmission ratio, and an engine driven power take-off (PTO) shaft for driving ancillary equipment connected to the tractor. When in a part load operating mode in which the PTO shaft is connected to drive an implement and the tractor is moving, the governor is set to maintain the engine working point to follow a selected speed governor line on the speed/load map of the engine. The controller is operative to initiate a change in the transmission ratio when the engine speed cannot be maintained within the specified tolerance of the desired engine speed.