A control device that includes an electronic control unit that is configured to, in a case where a request to start the internal combustion engine is made while a downshift for changing a speed ratio of the speed change device so that the speed ratio after shifting is higher than the speed ratio before shifting is being performed in the electric drive state, perform the first start control after the downshift is completed.

A power transmission system of a vehicle and a gear-shift control method are provided. The power transmission system includes a first drive assembly (101) and a second drive assembly (102). The first drive assembly includes a first automatic transmission (2) and a first motor (1) connected with the first automatic transmission (2) for outputting power to two wheels of the vehicle. The second drive assembly (102) includes a second automatic transmission (2000) and a second motor (1000) connected with the second automatic transmission (2000) for outputting power to the other two wheels of the vehicle. The first and second automatic transmission are configured to be shifted to a preset gear or a gear adjacent to the preset gear, such that when one of the first and second automatic transmission is shifted to the preset gear, the other one of the first and second automatic transmission is shifted to the preset gear or the gear adjacent to the preset gear.

A power transmission system of a vehicle and a gear-shift control method are provided. The power transmission system includes a first drive assembly (101) and a second drive assembly (102). The first drive assembly includes a first automatic transmission (2) and a first motor (1) connected with the first automatic transmission (2) for outputting power to two wheels of the vehicle. The second drive assembly (102) includes a second automatic transmission (2000) and a second motor (1000) connected with the second automatic transmission (2000) for outputting power to the other two wheels of the vehicle. The first and second automatic transmission are configured to be shifted to a preset gear or a gear adjacent to the preset gear, such that when one of the first and second automatic transmission is shifted to the preset gear, the other one of the first and second automatic transmission is shifted to the preset gear or the gear adjacent to the preset gear.

An electronic control unit is configured to set a target torque phase time which is used in torque phase control based on an output shaft torque difference. The electronic control unit sets the target torque phase time to be longer when the output shaft torque difference is large than when the output shaft torque difference is small. Accordingly, since the target torque phase time can be appropriately set, it is possible to achieve both of preventing a sudden change in driving force and torsion vibration of an output shaft and preventing a decrease in drivability due to hesitation at the same time. Sudden change in driving force and torsion vibration of the output shaft occur when the difference in driving force between before and after a gear shift is large. Hesitation occurs when the difference in driving force between before and after the gear shift is small.

An electronic control unit is configured to set a target torque phase time which is used in torque phase control based on an output shaft torque difference. The electronic control unit sets the target torque phase time to be longer when the output shaft torque difference is large than when the output shaft torque difference is small. Accordingly, since the target torque phase time can be appropriately set, it is possible to achieve both of preventing a sudden change in driving force and torsion vibration of an output shaft and preventing a decrease in drivability due to hesitation at the same time. Sudden change in driving force and torsion vibration of the output shaft occur when the difference in driving force between before and after a gear shift is large. Hesitation occurs when the difference in driving force between before and after the gear shift is small.

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 work vehicle includes a transmission to shift gears by switching between main transmission gears and auxiliary transmission gears, an input interface for a user to set a value of the main transmission gear corresponding to at least one of the auxiliary transmission gears, a storage to store a correspondence between the auxiliary transmission gear and the value, and a controller configured or programmed to, when the auxiliary transmission gear is switched, set the main transmission gear to the value corresponding to the switched auxiliary transmission gear based on the correspondence.

A work vehicle includes a transmission to shift gears by switching between main transmission gears and auxiliary transmission gears, an input interface for a user to set a value of the main transmission gear corresponding to at least one of the auxiliary transmission gears, a storage to store a correspondence between the auxiliary transmission gear and the value, and a controller configured or programmed to, when the auxiliary transmission gear is switched, set the main transmission gear to the value corresponding to the switched auxiliary transmission gear based on the correspondence.

A two-speed transmission system for an electric vehicle is disclosed. The system includes a housing, a one-way clutch assembly adapted to be mounted on an input shaft and to be coupled with a first gear drive assembly, a multi-plate friction clutch assembly adapted to be mounted on the input shaft and having a clutch hub disposed in the housing and mounted on the input shaft, a second gear drive assembly freely mounted on the input shaft and having external spline on an outer diameter adapted to be engaged with the clutch hub of the multi-plate friction clutch assembly. The one-way clutch assembly is adapted to rotate to operate the vehicle in the first gear drive when the input shaft is rotated in a drive direction, and the multi-plate friction clutch assembly is in a disengaged state when the vehicle is operated in the first gear drive.

A two-speed transmission system for an electric vehicle is disclosed. The system includes a housing, a one-way clutch assembly adapted to be mounted on an input shaft and to be coupled with a first gear drive assembly, a multi-plate friction clutch assembly adapted to be mounted on the input shaft and having a clutch hub disposed in the housing and mounted on the input shaft, a second gear drive assembly freely mounted on the input shaft and having external spline on an outer diameter adapted to be engaged with the clutch hub of the multi-plate friction clutch assembly. The one-way clutch assembly is adapted to rotate to operate the vehicle in the first gear drive when the input shaft is rotated in a drive direction, and the multi-plate friction clutch assembly is in a disengaged state when the vehicle is operated in the first gear drive.