ABS II and EVO Integral ABS

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MikeCam
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ABS II and EVO Integral ABS

Post by MikeCam »

ABS II (1992 onward. R1100 series and early R1150GS through 2002)

The closed-loop control circuit consists of signal processing by the sensors and automatic control electronics which activate the electro-motor-powered pressure modulator in the event of overbraking by the wheel. If the ABS control unit detects that wheel locking is about to take place on the basis of impulses being received from the rotating-speed sensors, it activates the motor of the clutch shaft. At the same time, the electro-magnetically controlled friction clutch of the respective brake circuit mounted to the clutch shaft is activated. Depending on the frictional torque generated by the control unit in this clutch, the plunger piston in the pressure modulator is pulled downwards against a spring resistance by a precisely defined amount. The resulting enlarged volume above the plunger piston results in the pressure decrease required in the brake circuit. At the same time, the movement of the reciprocating piston is recorded by the displacement sensor and forwarded to the ABS control unit, which obtains the information needed concerning the position of the piston in this manner and thus has a reference as to the relative brake pressure in the brake circuit. This scanning takes place within the closed-loop range every 8 ms and in the open-loop range every 4 ms. The wheel is optimally decelerated just below the locking limit. This control sequence is repeated every time the wheel is on the verge of locking.

This system is the first system to enable recognition of the relative pressure by virtue of the displacement sensor of the reciprocating piston, with its corresponding position consequently making it possible to operate the motorcycle in accordance with any brake pressure curve in keeping with the respective riding conditions. Based on the rotating-speed information coming from both wheels, this system is also capable of detecting lifting of the rear brake when the brakes are fully applied and preventing this by correspondingly regulating the pressure in the front wheel brake circuit. Owing to the fact that this system employs a plunger piston, the brake pressure can be decreased to 0 bar, thus ensuring dependable control behaviour on difficult riding surfaces. Credit to Anton

EVO Integral ABS (R1150xx 2001-2005) (aka - EVO, servo-assist, linked ABS, or ABS III)

EVO Brakes are the rotors and calipers of the BMW integral system. These are improved, lighter, more forceful, and less maintenance intensive. BMW claim 15% less application force is required for the same braking pressure; 10% weight savings overall, and 50% greater pad life.

Integral ABS refers to the linked (fully - R1150RT or partially - all others) braking system and the ABS functioning. It consists of power assist (servo), anti-lock (ABS), and front-to-rear integration (linked) of braking. Fully linked systems apply all brakes whenever any brake lever/pedal is engaged. Partially linked systems apply all brakes whenever the front lever is engaged but engage only the rear brake when the rear pedal is engaged. The power assist feature reduces the hand force required at the brake lever by 35%. It is controlled by an electro-mechanical unit and hydraulic pump. The ABS function includes electro-magnetic and mechanical sensors similar to the ABS II but with faster cycling times, a load distribution feature, and less complicated hydraulics resulting in greater response to changing conditions (4-12ms) during braking.

With the introduction of the R1200 series (2004-2007) there were changes to the system resulting in less servo control, more braking force and improved functioning across the range of uses. Since mid-2007 many models have featured an entirely new, Continental-Teves, ABS system that functions in a completely different manner from the ABS II and EVO Integral ABS.
The Older I Get, The Less I Know.
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