Switching The Light On And Off; Assistance By The Electric Motor; Operating Principle Of Assistance - Bosch Dtive Unit Speed Manual Original

The fewer of the 6 bars that are displayed, the lower the
actual power output of the motor and the consumption. If
more bars are visible, the power output and consumption
of the motor is higher.
IF YOU CAN THE BATTERY IS SUPPLYING
SEE... A CURRENT OF
6 bars more than 20 amperes
5 bars up to 16 – 20 A
4 bars up to 12 – 16 A
3 bars up to 8 – 12 A
2 bars up to 2 – 8 A
1 bar up to 0 – 2 A
If the power consumption is very low, no bars are
displayed.

4.1.12 Switching the light on and off

If you are using the assistance and press the light switch,
this switches the lighting of the fast Pedelec on and off.
If you are riding with the lights on and switch off the
system, the lights also switch off automatically. You must
therefore switch the lights on again.
You must always take the battery with you, even if you
want to ride without assistance as the lights will only
work with the battery.
14 II User Manual Fast Pedelec

5 Assistance by the electric motor

If your Pedelec is equipped with hub gears, you may
have to take more load off the pedals when changing
gears than you would normally do when riding your
conventional bike. This is due to the additional power
output of the electric motor. The hub gear system
contains a device that protects it against gear shifting
operations under excessive loads in order to preserve
the gear unit in the hub.
5.1

Operating principle of assistance

The motor provides support as soon as you switch the as-
sistance on and start pedalling.
The thrust delivered by the motor depends on three factors:
• Your own pedalling effort
The motor adapts to the force you apply. If you
pedal harder, e.g. uphill or when setting off, the
power sensor detects this and increases the thrust
accordingly. However, the thrust is limited by the
maximum motor output.
• The assist level you have selected
With the "high assist level / HIGH" setting, the
power delivered by the motor is double your own
effort (1 : 2).
With the "medium assist level / Standard" setting,
the power delivered by the motor increases your
effort in a ratio of 1 : 1.3.
With the "low assist level / ECO" setting, the power
delivered by the motor is more than half your own
effort (1 : 0.75).
• The speed at which you are currently travelling
When you set off on your Pedelec, the assistance
increases as you build up speed until the bike
reaches its maximum speed of roughly 36 km / h.
The assistance then reduces automatically until
you reach a speed of 45 km / h when it switches off.
This applies for the largest gear only. In all other
gears, the motor switches off earlier, depending on
the gear ratio.