How clutch-by-wire works

1. THROTTLE OFF AND COAST

The driver leaves the car in gear as it starts to coast (eg. for lights or traffic). An electronic signal is sent to the ’box and mild-hybrid starter generator (MHSG) to seamlessly switch off the engine and open the clutch.

2. SEAMLESS RESTARTS

The engine restarts in neutral (with an open clutch) if the driver pushes the clutch pedal to change gear. Electric power from the MHSG and 48V battery instantly brings the engine and transmission up to the correct speed.

3. SAVING FUEL AND EMISSIONS

If the car drops below a certain speed, the engine restarts with assistance from the MHEV system, and the clutch closes, to avoid labouring the engine in the engaged gear. Real-world efficiency improved by three percent.