Automated shift assistant – you choose manual or auto
Words NZ Autocar | Images BMW Motorrad
With Automated Shift Assistant (ASA), BMW Motorrad introduces shifting that will “simplify your ride”. Choose clutchless gearshifting that happens automatically, or shift yourself without having to operate a clutch lever.
Two electromechanical actuators activate the clutch and gearshift of the six-speed transmission. There is no hand lever for clutch operation so manual operation is just like using a quickshifter. The exception is taking off from stopped, which is evidently smooth and easy.
In the ‘D’ or automatic mode, the ECU selects the shift point, depending on ride mode chosen, and shifts are almost instantaneous. In ‘M’ shift mode, gear changes are conventional, the rider deciding when.
Upshifting in ‘D’ mode eliminates the jolt normally associated with manual shifting. This limits the risk of helmet contact between rider and pillion.
Downshifts are oily smooth, regardless of riding mode. According to BMW Motorrad, “riding becomes a more relaxed and enjoyable experience”.
The system also simplifies starts on uphill gradients, and ensures better control during off-road riding.
The Automated Shift Assistant is a technical evolution of the BMW Motorrad Shift Assistant Pro (quickshifter). The control unit senses the rider’s shift request via a gearshift lever sensor activated by rider input.
Additional sensors determine the revs of the transmission input shaft and the clutch position. These values reach the TCU (Transmission Control Unit), which is closely linked to the engine control unit, for modelling and control of the clutch, shift actuation and status.
In ‘M’ mode, if the revs in the desired target gear are acceptable, the shift is made directly. If the engine revs fall below a minimum speed, downshifts happen automatically in manual mode which prevents the engine from stalling.
In shift mode “D” the gears change automatically depending on the riding mode, engine revs, throttle position and lean angle parameters.
To date, the system is available on BMW boxer twin models only.
