Dedicated shifting system for electrified multispeed transmissions

Linear actuators

When using a linear actuator, no mechanical transformation is necessary, this can reduce the time and energy needed for shifting. Furthermore, position-controlled operation of the actuator allows fast yet quiet and smooth engagement of the clutch. Further functionality can be integrated in the actuator, like passive and contactless rod locking.

Differential angle sensor

An angular controlled engagement of dog clutches allows for jerk-free shifting. This requires fast and precise measurement of the angular position of the clutches, which can be done with multiple complex shaft-mounted sensors, as incremental encoders or resolvers. However, backlashes decrease the accuracy of the dog clutch angle calculations. Therefore, the use of a dedicated dog clutch differential angle sensor is more reliable, less expensive and easier to integrate into the transmission.

Transmission control unit

The control of the traction machine is crucial for comfortable and fast gear changes with active synchronization. This is especially true for angular position-controlled engagement of the dog clutches. The transmission control unit is essential to realize comfortable and fast gear changes with the shift actuator and dog clutches with various drivetrain topologies.