DUAL CLUTCH TRANSMISSION (DCT) • Super-fast gear changes in either Manual Transmission (MT) or Automatic D and S modes
• S mode (with 3 levels) revs higher and downshifts sooner than D, for more aggressive riding
• G switch improves rear wheel traction when off-road
• Incline detection adapts shift pattern depending on gradient
• IMU allows corning detection function for improved shift timings
Honda has sold over 100,000 DCT-equipped motorcycles across Europe since the system first appeared as an option on the VFR1200F a decade ago in 2009. Testament to its acceptance in the marketplace, during the last financial year, DCT accounted for 48% of European sales on models where DCT was an option.
The unique DCT system delivers consistent, super-fast seamless gear changes, and very quickly becomes second nature in use. It uses two clutches: one for start-up and 1st, 3rd and 5th gears: the other for 2nd, 4th and 6th, with the mainshaft for each clutch located inside the other for compact packaging.
Each clutch is independently controlled by its own electro-hydraulic circuit. When a gear change occurs, the system pre-selects the target gear using the clutch not currently in use. The first clutch is then electronically disengaged as, simultaneously, the second clutch engages.
The result is a consistent, fast and seamless gear change. Furthermore, as the twin clutches transfer drive from one gear to the next with minimal interruption of the drive to the rear wheel, any gear change shock and pitching of the machine is minimised, making the change feel direct as well as smooth.
The extra benefits of durability (as the gears cannot be damaged by missing a gear) impossibility of stalling, low stress urban riding and reduced rider fatigue add to DCT’s appeal
Three modes of operation are available. MT mode gives full manual control, allowing the rider to shift with the handlebar trigger control buttons. Automatic D mode is ideal for city and highway riding, and achieves optimum fuel efficiency. Automatic S mode offers three levels of sportier riding, as the ECU lets the engine rev a little higher before shifting up, and shifts down sooner when decelerating for extra engine braking.
In either D or S mode, DCT offers immediate manual intervention if required – the rider simply selects the required gear using the up and down shift triggers on the left handlebar. At an appropriate time, DCT seamlessly reverts back to automatic mode, depending on throttle angle, vehicle speed and gear position.
DCT for the Africa Twin is also fully equipped to operate in an adventure environment, with off-road functionality enhanced by the G switch accessed via the TFT touch screen display. Activating the G switch in any riding mode improves the feel for available traction and machine control by reducing the amount of clutch slip during gear changes.
Further functionality for the DCT system comes in the form of incline detection, by means of which the gear shift pattern is adapted depending on the grade of an incline to provide optimum control.
A new feature for the CRF1100L Africa Twin Adventure Sports’ DCT system is cornering detection. When the IMU recognises the bike is cornering, the system subtly adjusts the shifting programme for the most natural gear changes.