Proposed is a transmission of a working vehicle. The transmission of a working vehicle includes an ultra-low speed gearbox having an ultra-low speed shift rod which moves axially and an ultra-low speed shift fork coupled to the ultra-low speed shift rod, a sub-gearbox which operates by receiving power shifted from the ultra-low speed gearbox and has two sub-shift rods and two sub-shift forks, and a stopper which is disposed between the ultra-low speed gearbox and the sub-gearbox and limits an ultra-low speed shift stage engagement of the ultra-low speed gearbox when the sub-gearbox is engaged in a specific stage (a sub-shift highest stage), thereby preventing damage or breakage to parts of an associated transmission due to the rapid rotation of the sub-gearbox during an ultra-low speed and high load operation.

A continuous variable transmission (CVT) hydraulic pressure control device includes: a pressure regulation valve regulating an operation pressure of oil supplied to a friction element of a forward-rearward device; and a switch valve to respectively switch oil discharge paths through which the oil supplied to the friction element is discharged, respectively by a pilot pressure from the pressure regulation valve and an elastic force of a return spring. In particular, the oil discharge paths switched by the switch valve have oil flow resistances different from each other.

Methods for automated calibration and adaption of a gearshift controller (39) are disclosed. In one aspect, the method automates calibration a gearshift controller (39) for controlling a sequence of gearshifts in either a stepped automatic transmission equipped with at least one speed sensor mounted on a dynamometer (42) or an automotive vehicle mounted on a dynamometer (42), where the dynamometer (42) is electronically controlled by a dynamometer controller (43). Each gearshift in the sequence includes a first phase, a second phase, . . . and an N.sup.th phase. The gearshift controller (39) includes (initial values of) a first phase control parameters set, a second phase control parameters set, . . . and an N.sup.th phase control parameters set for each gearshift in the sequence that are updated using a first phase learning controller, a second phase learning controller, . . . and an N*11 phase learning controller respectively.

Methods for automated calibration and adaption of a gearshift controller (39) are disclosed. In one aspect, the method automates calibration a gearshift controller (39) for controlling a sequence of gearshifts in either a stepped automatic transmission equipped with at least one speed sensor mounted on a dynamometer (42) or an automotive vehicle mounted on a dynamometer (42), where the dynamometer (42) is electronically controlled by a dynamometer controller (43). Each gearshift in the sequence includes a first phase, a second phase, . . . and an N.sup.th phase. The gearshift controller (39) includes (initial values of) a first phase control parameters set, a second phase control parameters set, . . . and an N.sup.th phase control parameters set for each gearshift in the sequence that are updated using a first phase learning controller, a second phase learning controller, . . . and an N*11 phase learning controller respectively.

A gearbox for a vehicle that includes a planetary gear with a ring gear, a sun gear and a planet gear carrier, on which at least one planet gear is rotatably mounted, which ring gear and sun gear are configured to engage with the at least one planet gear; a gearbox housing surrounding the planetary gear; an input shaft and an output shaft for the transfer of torque to and from the gearbox; a first axially movable coupling sleeve for selectively engaging and disengaging the planetary gear with/from the gearbox housing and for selectively engaging and disengaging the ring gear, the sun gear and the planet gear carrier with/from each other; and a second axially movable coupling sleeve for selectively engaging and disengaging the output shaft with/from the ring gear and with/from the planet gear carrier.

A gearbox for a vehicle that includes a planetary gear with a ring gear, a sun gear and a planet gear carrier, on which at least one planet gear is rotatably mounted, which ring gear and sun gear are configured to engage with the at least one planet gear; a gearbox housing surrounding the planetary gear; an input shaft and an output shaft for the transfer of torque to and from the gearbox; a first axially movable coupling sleeve for selectively engaging and disengaging the planetary gear with/from the gearbox housing and for selectively engaging and disengaging the ring gear, the sun gear and the planet gear carrier with/from each other; and a second axially movable coupling sleeve for selectively engaging and disengaging the output shaft with/from the ring gear and with/from the planet gear carrier.

The present invention relates to a transmission of an agricultural work vehicle, the transmission comprising: a pre-shift part for performing speed shifting on driving transmitted from an engine of an agricultural work vehicle; a clutch part connected to the pre-shift part so as to selectively output driving transmitted from the pre-shift part; an adjusting part connected to the clutch part so as to perform speed shifting on driving transmitted from the clutch part; and a subsequent shift part connected to the adjusting part so as to perform speed shifting on driving transmitted from the adjusting part.

An electronic controller for a variable ratio transmission and an electronically controllable variable ratio transmission including a variator or other CVT are described herein. The electronic controller can be configured to receive input signals indicative of parameters associated with an engine coupled to the transmission. The electronic controller can also receive one or more control inputs. The electronic controller can determine an active range and an active variator mode based on the input signals and control inputs. The electronic controller can control a final drive ratio of the variable ratio transmission by controlling one or more electronic solenoids that control the ratios of one or more portions of the variable ratio transmission.

An electronic controller for a variable ratio transmission and an electronically controllable variable ratio transmission including a variator or other CVT are described herein. The electronic controller can be configured to receive input signals indicative of parameters associated with an engine coupled to the transmission. The electronic controller can also receive one or more control inputs. The electronic controller can determine an active range and an active variator mode based on the input signals and control inputs. The electronic controller can control a final drive ratio of the variable ratio transmission by controlling one or more electronic solenoids that control the ratios of one or more portions of the variable ratio transmission.

A hybridised drivetrain for a motor vehicle. A transmission assembly of the vehicle has at least one first planetary gear set. A first element of the first planetary gear set is a ring gear. A second element of the first planetary gear set can be connected to an electric machine of the vehicle with a clutch and can be secured against a housing. The second element is a sun gear. A third element of the first planetary gear set is connected to an output. The third element is a planet carrier. The ring gear can also be connected to the electric machine by means of a clutch. The clutch has an output disc carrier connected to the sun gear. The clutch has an output disc carrier connected to the ring gear. The input disc carrier and the output disc carrier can rotate relative to one another.