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BMW S1000RR and its electronics - How it all works (together!)


by Marc Cantin ,

Torque Smoothing - Torque flows from an engine in a continuous series of small flat spots and sudden rises that can disturb the rear contact patch and decrease grip. The ECU knows what happens at what rpm and continuously adjusts the throttle butterflies to effectively smooth out the torque curve and let torque flow out to the clutch in one nice continuous flow.

Throttle dampening – In Rain and Sport modes, the ECU increases throttle opening more slowly than in the other modes, reducing a “Snap open” motion from the rider by a safer 5% to prevent loss of grip at the rear.

Race ABS
The ABS uses wheel-speed sensors to reduce braking effort to that wheel when it senses a set level of slippage. The sensitivity of the system varies according to the active Mode, permitting no slippage in Race mode and more and more in the other three.

The ring with holes senses rotational speed of the front wheel, that is the used as input to the DTC and ABS systems. You can also see the on-piece Brembo caliper, and the adjustment screw for the fork damping, with the 1 to 10 numerals on the red ring to show the setting.

Linked brakes – The ABS will also add some rear braking when it senses very hard braking at the front.

Anti Stoppie – When sensors indicate that the rear wheel is off the ground, the system will reduce front braking slightly to let the rear touch the ground.

In all cases, the ABS optimizes traction according to the Mode settings, making for a safer ride under all conditions.

Dynamic Traction Control (DTC)
When wheel-speed sensors detect a difference between front and rear wheels, with the brakes not applied and the engine pulling, the ECU assumes that the rear tire is slipping. The DTC then reduces fuel and ignition, in that order, to reduce power until slippage drops to an acceptable level for the active Mode.

Wheelie Control - In Rain and Sport modes, lean angle sensors and the ABS sensors can tell the ECU that the front wheel is in the air (it slows down relative to the rear wheel and the brakes are not applied). After a set number of seconds, or according to set maximum wheelie angles for each Mode, the ECU reduces the throttle slightly to bring the wheel back on the ground.

The ECU allows such wheelies up to 29 degrees of lateral lean, which makes for spectacular wheelies (Up to 33 degrees nose-up attitude) when coming out of corners sideways – great for pictures!

Power Freeze – The ECU senses lean angle and limits power if the angle is greater than a limit set for each Mode. As the bike returns toward the vertical, the ECU feeds the power back gradually, according to the throttle opening, the limits of the active Mode, and the input from other sensors regarding slippage or wheelies.

The rider can turn off the DTC as wells as the ABS at any time.
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