Abstract:
A work vehicle includes: a restrainer vehicle speed setter (71) configured to set a restrainer vehicle speed for preventing the switch of a forward/backward travel switching device (23) ; and a switch restrainer (70) configured to (i) permit the switch of the forward/backward travel switching device (23) while a detected vehicle speed is lower than the restrainer vehicle speed and (ii) prevent the switch of the forward/backward travel switching device (23) while the detected vehicle speed is a high speed not lower than the restrainer vehicle speed.
Abstract:
A control device for a vehicle is provided that includes: a transmission mechanism capable of setting a fixed transmission gear ratio; a continuously variable transmission provided in parallel with the transmission mechanism; and a path switching mechanism for selectively blocking a torque transmission path that includes the transmission mechanism and that is configured to dampen a vibration by controlling actuation of the path switching mechanism in accordance with an operation state of the vehicle. The control device for a vehicle includes a clutch mechanism in which the continuously variable transmission and the transmission mechanism capable of setting a constant transmission gear ratio are arranged in parallel between an input shaft and an output shaft, that selectively connects the torque transmission path stretching from an internal combustion engine to drive wheels via the transmission mechanism in a manner capable of transmitting torque, and in which one clutch and the other clutch are arranged in series and the other clutch is arranged on a relatively downstream side, and is configured to engage either one of the one clutch and the other clutch in the case where the torque is transmitted from the internal combustion engine to the drive wheels via the continuously variable transmission.
Abstract:
A transmission includes a sub-transmission mechanism (30), a variator (20) having lower shift responsiveness than the sub-transmission mechanism (30), and a controller (12) configured to carry out a coordinated shift for changing a speed ratio of the variator (20) in a direction opposite to a changing direction of a speed ratio of the sub-transmission mechanism (30) as the sub-transmission mechanism (30) is shifted so that a through speed ratio reaches a target through speed ratio. The controller (12) sets a target speed ratio of the sub-transmission mechanism (30) on the basis of the target through speed ratio and an actual speed ratio of the variator in carrying out the coordinated shift.
Abstract:
A continuously variable transmission for a vehicle according to the present invention includes a transmission controller (12) configured to perform a variator (20) and an auxiliary transmission (30), a line pressure regulating valve (11a), a primary pressure regulating valve (11b), and a secondary pressure regulating valve (11c). The transmission controller (12) includes a line pressure control section ( FIG. 4 ) configured to increase a line pressure (PL) to be greater than the line pressure before the generation of the oil vibration when the oil vibration is generated in at least one of the primary pressure (Ppri) and the secondary pressure (Psec). When the auxiliary transmission mechanism (3) is shifted in a state where the line pressure (PL) is increased, the line pressure section ( FIG. 4 ) is configured to continue the increase of the line pressure (PL) until the auxiliary transmission mechanism (30) is finished for attaining the stable shift.
Abstract:
When the control unit monitoring the dual clutch transmission detects input signals from the driver and/or the prime mover and transmission indicating that the free-wheeling mode should be exited, then the transmission is controlled to reconnect the prime mover and the driving wheels. According to the invention, a rapid reconnection of the prime mover to the driven wheels is achieved by engaging the second, normally open clutch unit. Prior to engagement, the control unit can select a suitable gear depending on the input signals from the driver and/or the prime mover. As none of the first set of gears connecting the first input shaft to the driving wheels in the first transmission mechanism is engaged, the first clutch unit can be disengaged during or after engagement of the second clutch unit.
Abstract:
A hydraulic control device includes a first solenoid valve (SLG) capable of supplying an engagement pressure (PSLG), and a switching valve (27) capable of supplying the engagement pressure (PSLG), which is supplied from the first solenoid valve (SLG), switchably to one of a synchronization mechanism (S1) and an engagement element (B1, C1, C2). Thus, the first solenoid valve (SLG) can be commonly used for the synchronization mechanism (S1) and the engagement element (B1, C1, C2) as the source of supply of the engagement pressure (PSLG).
Abstract:
A control device for a vehicle is provided that includes: a transmission mechanism capable of setting a fixed transmission gear ratio; a continuously variable transmission provided in parallel with the transmission mechanism; and a path switching mechanism for selectively blocking a torque transmission path that includes the transmission mechanism and that is configured to dampen a vibration by controlling actuation of the path switching mechanism in accordance with an operation state of the vehicle. The control device for a vehicle includes a clutch mechanism in which the continuously variable transmission and the transmission mechanism capable of setting a constant transmission gear ratio are arranged in parallel between an input shaft and an output shaft, that selectively connects the torque transmission path stretching from an internal combustion engine to drive wheels via the transmission mechanism in a manner capable of transmitting torque, and in which one clutch and the other clutch are arranged in series and the other clutch is arranged on a relatively downstream side, and is configured to engage either one of the one clutch and the other clutch in the case where the torque is transmitted from the internal combustion engine to the drive wheels via the continuously variable transmission.
Abstract:
A gear selector comprising a gate pattern and a gear lever arranged to be moveable within the gate pattern, the gate pattern comprising: a high range gate sub-pattern comprising one or more high range gear planes for moving the gear lever into to select a high range gear; a low range gate sub-pattern comprising one or more low range gear planes for moving the gear lever into to select a low range gear; a neutral plane extending transversely with respect to the high and low range gear planes; and a force profile arranged to urge the gear lever when in the neutral plane toward a resting position in one of the one or more high range gear planes, the force profile comprising a first interference arranged to divide the high range gate sub-pattern from the low range gate sub-pattern, wherein the gear lever is moveable past the first interference from the high range gate sub-pattern to the low range gate sub-pattern when a first predefined action is performed by an operator moving the gear lever.
Abstract:
In a control apparatus for an automatic transmission including a continuously variable transmission mechanism continuously modifying speed ratio and a stepped transmission mechanism that is disposed on a downstream side of the continuously variable transmission mechanism and being switched between a plurality of gear positions by engaging and disengaging a plurality of frictional engagement elements, the control apparatus comprises a control unit that performs a coordinated shift by shifting the stepped transmission mechanism and simultaneously shifting the continuously variable transmission mechanism in an opposite direction to a shift direction of the stepped transmission mechanism in order to suppress variation in a through speed ratio, which is an overall speed ratio of the automatic transmission, when the stepped transmission mechanism is upshifted and the control unit predicts, on the basis of an increase in an accelerator opening, that judder will occur in the frictional engagement element during the upshift, the control unit reduces a shift speed of the continuously variable transmission mechanism while shudder is predicted to occur in the frictional engagement element in comparison with a shift speed of the continuously variable transmission mechanism during the coordinated shift, the coordinated shift being executed at an accelerator opening corresponding to the increased accelerator opening.
Abstract:
First temporary capacity reduction control that when acceleration ON is judged during coasting lock-up, brings lock-up clutch (20) into slip state by decreasing torque transmission capacity of lock-up clutch and subsequently returns lock-up clutch to lock-up state by increasing torque transmission capacity is executed. Control unit performing second temporary capacity reduction control that when return of accelerator pedal depression is judged during the progress of returning to lock-up state, decreases torque transmission capacity again and subsequently returns lock-up clutch to lock-up state by increasing torque transmission capacity is provided. In second temporary capacity reduction control, torque transmission capacity is decreased with predetermined torque transmission capacity by which lock-up clutch is not fully disengaged being lower limit value. Abrupt engagement of lock-up clutch and engine racing can be therefore avoided when acceleration is changed from ON to OFF during control of lock-up clutch from disengagement or slip state to lock-up state.