A method for operating a drive train of a motor vehicle includes selecting between first and second operating strategies for controlling a starting component (3A, 3B) during a stopping process of the motor vehicle, and carrying out a downshift of the transmission (G) during the stopping process after implementing the first operating strategy or the second operating strategy. In the first operating strategy, the starting component (3A, 3B) is engaged or locked up and/or remains engaged or locked up at least until the motor vehicle comes to a standstill. In the second operating strategy, the starting component (3A, 3B) is disengaged or the lock-up of the starting component (3A, 3B) is released before the motor vehicle come to the standstill. The downshift of the transmission (G) is triggered at a different rotational speed limit value upon implementation of the first operating strategy than upon implementation of the second operating strategy.

In a transmission control device, a controller determines failure of a rotation sensor. A hydraulic control circuit and the controller variably control a speed ratio of a variator. The hydraulic control circuit and the controller variably control a gear position of a sub-transmission mechanism, and in a case where the failure is determined, fix the gear position of the sub-transmission mechanism to first speed. The hydraulic control circuit and the controller fix the gear position of the sub-transmission mechanism to the first speed during a vehicle stop in a case where the gear position of the sub-transmission mechanism upon a determination of the failure is second speed.

A driving assistance system for a work vehicle may comprise a service brake configured to decelerate the work vehicle upon actuation of the service brake, a parking brake and a transmission including a clutch. A controller may be configured to disengage the clutch when the work vehicle speed is less than a speed threshold and when the service brake is actuated, whereby the work vehicle is brought to a stop.

A control apparatus and a control method for a transmission of an agricultural work vehicle are provided, the control apparatus including: a forward/backward clutch of a forward/backward shifting unit that performs forward/backward shifting with respect to drive generated by an engine; and a drive clutch of a drive shifting unit that performs drive shifting with respect to the drive generated by the engine.