Vehicle with Dual Clutch Transmission

Open Model

This example shows a vehicle with a five-speed dual-clutch transmission. Gear shifts are implemented via the two clutches, one clutch pressure being ramped up as the other clutch pressure is ramped down. Gear pre-selection via dog clutches ensures that the correct gear is fully selected before the on-going clutch is enabled.

The transmission controller is optionally available. It converts the pedal deflection into a demanded torque. This demanded torque is then passed to the engine management. The pedal deflection and the vehicle speed are also used by the transmission controller to determine when the gear shifts should occur.

This model can be configured for fixed-step simulation, making it suitable for hardware-in-the-loop testing.

Model

Dual Clutch Transmission Subsystem

Two Disk Friction Clutch components from Simscape™ Driveline™ are connected in parallel, modeling the two clutches in a dual-clutch transmission. Only one of these clutches is engaged at a time. Engaging and disengaging these clutches is how gear changes are made.

Gears Subsystems

Five Dog Clutch components from Simscape Driveline are connected between the follower shaft of each gear to the transmission output shaft. At any point, two of the dog clutches are engaged, that for the current gear and that for the next gear to which the transmission shifts. The controller preselects the next gear to which the transmission shifts by engaging the dog clutches.

Odd Gears

Even Gears

Vehicle Subsystem

Tire models from Simscape Driveline that are characterized by the Magic Formula are connected to a longitudinal model of the vehicle dynamics. The driveshaft is connected to the rear wheels. The normal force for each axle is used in the slip calculation for each wheel.

Simulation Results from Simscape Logging

The plots below show the engine and vehicle speed as it accelerates.