In the active transportation mode of a motor vehicle, only the forward gears can be selected. The weakest shift element, in particular the weakest brake or clutch in an automatic transmission, always is closed in the forward gears. Preferably, manual shifting options in an electronically controlled automatic transmission with a manual mode are additionally suppressed.

The present disclosure relates to a shifting apparatus for a vehicle which includes a transmission realizing series of multi shift stages so that shift stages are sequentially increased as shift ratios are decreased. The shifting apparatus may include a shift limit means designating a lowest shift stage having a largest shift ratio to a shift stage for climbing and limiting so that a driver may select the shift stage for climbing in an only case that the vehicle satisfies a predetermined climbing condition; a gradient angle sensor for measuring a climb gradient of the vehicle; a vehicle speed sensor for measuring a vehicle speed; and a controller determining the climbing condition based on signals of the gradient angle sensor and the vehicle speed sensor so as to control the shift limit means.

A method of operating a vehicle having an engine, a throttle valve and a throttle operator. A continuously variable transmission operatively connected to the engine has a driving pulley, a driven pulley, and a belt operatively connecting the driving and driven pulleys. A ground engaging member is operatively connected to the driven pulley. A piston is operatively connected to the driving pulley for applying a piston force thereto and thereby changing an effective diameter of the driving pulley. A control unit controls actuation of the piston and the piston force. The method includes detecting a stall condition indicative of the vehicle being stalled, and, responsive to the detection, setting the piston force to be zero.

Systems and methods are provided for controlling a transmission. An engine stop-start event may be allowed or denied based on one or more characteristics of the vehicle including the transmission.

A controller includes a control unit configured to perform stepwise shift that upshifts a CVT in a stepped manner to accelerate a vehicle. The control unit performs a downshift control configured to downshift the continuously variable transmission in a case in which an accelerator pedal is continuously stepped on from before prohibition of the stepwise shift to after prohibition of the stepwise shift.

A control device of a continuously variable transmission has at least an automatic shift mode and a temporary manual mode. The control device includes an insufficient drive force determination unit, a first insufficient acceleration determination unit, and a downshift control unit. The insufficient drive force determination unit determines whether drive force insufficiency occurs if acceleration is performed in the current transmission gear. The first insufficient acceleration determination unit determines whether there is an acceleration request made by the driver of the vehicle. The downshift control unit downshifts from the current transmission gear to a transmission gear at a lower speed side in a case where, in the temporary manual mode, the insufficient drive force determination unit determines that a drive force insufficiency occurs and the first acceleration request determination unit determines that there is an acceleration request.

The apparatus suppresses manual shifting options in an electronically controlled automatic transmission with a manual mode in the active transportation mode of a motor vehicle by appropriate programming of an electronic transmission control unit. The transmission can be operated only in the automatic mode. Preferably, only the forward gears can be selected in this case, the weakest shift element, in particular the weakest brake or clutch in an automatic transmission, always being closed in the forward gears.

A hydrostatic transmission device of a mobile machine having —at least one first motor and at least one second motor, —at least one first dual motor and at least one second dual motor each having first and second elementary motor, —the second elementary motor of the first dual motor is linked with the first motor by a serial duct, —the second elementary motor of the second dual motor is linked with the second motor by a serial duct, —each serial duct has a valve having an opening for passage of the fluid into the serial duct, said valve having a first position in which said opening has a maximum cross-section, and a second position in which said opening has a reduced cross-section, the movement of said valve between these two positions activated a control instruction generated when the machine is travelling on a slope.

A method for selecting a gear when Start-Stop Coasting (SSC) is released may include: determining whether a traveling vehicle satisfies a condition for releasing SSC after entry into SSC (S100); selecting a gear input to a transmission (S200) when the traveling vehicle satisfies the condition for releasing SSC after entry into SSC; determining a road gradient (S300) when the traveling vehicle satisfies the condition for releasing SSC after entry into SSC; and correcting the selected gear according to a pre-stored correction map so as to correspond to the determined road gradient.

A method and system are provided for operating a lockup clutch of a torque converter of a motor vehicle. The torque converter includes a pump rotatably driven by a drive unit, a rotatable turbine fluidly coupled to the pump and configured to drive an input shaft of a transmission, and a lockup clutch selectively engageable to non-fluidically couple the pump to the turbine to transmit torque from the drive unit to the transmission. The operation of the lockup clutch is controlled by the system in response to detecting that the motor vehicle is coasting.