Abs - Bosch BLACK BIRD KB064-ZAFT Series Translation Of The Original Operating Instructions

3.1.3.4 ABS

(2) (3) (4)
(1) (5)
1 1
(6)
2
Figure 13: BOSCH ABS
1 ABS control unit with housing
2 Display screen
3 ABS indicator lamp
4 Control panel
5 Front wheel brake lever
6 Brake calliper
7 Bike speed sensor
8 Sensor disc
ABS is an added function in some pedelecs.
The rear wheel brake function does not depend on
the anti-blocking system functioning correctly.
When the brakes are applied, the ABS function
detects critical slippage thanks to the wheel speed
sensors on the front and rear wheels and limits
slippage on the front wheel by reducing brake
pressure there, thus stabilising the wheel. Once
the wheel has been stabilised, the wheel is
brought to the blocking limit again by building up
pressure selectively.
The lever moves a little more towards the
handlebars with each brake impulse during this
process. If the wheel blocks again, the pressure is
reduced again. This process is repeated to keep
the wheel at its limit of traction, thus making
optimum use of the coefficient of friction between
the tyres and the road surface.
The ABS function terminates when one of the
following events occurs:
MY20B01-22_1.0_21.06.2019
• The buffer chamber in the ABS control unit is filled
completely.
• The pedelec has come to a halt.
• The rider releases the brake.
Besides the ABS function itself, the unit also
includes a system to detect when the rear wheel
is raised during full braking. This enables the rider
to counteract a potential flip-over caused by
extremely hard brake manoeuvres to a certain
extent.
If the battery level falls below a specified
threshold, the system deactivates the power
assistance first. The system will still remain
active, including the display, lights and ABS until
(6)
the battery reserve is also used up. The electric
drive system and, consequently, the ABS will not
(7)
switch off until the battery has almost fully
(8)
discharged.
The indicator lamp lights up for about 5 seconds
before the system switches off completely. The
ABS indicator lamp will then go out, even though
the ABS control system is not available. The ABS
is not active if there is no battery on the pedelec
or its battery is empty.
The brake system itself remains functional. It is
only the anti-blocking system control which no
longer operates.
Overview
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