Assistance By The Electric Motor; Operating Principle Of Assistance - Bosch Drive Unit Speed Manual Original

6 Assistance by the electric motor

6.1

Operating principle of assistance

If you switch on the assistance and start pedalling, the
motor starts as soon as the rear wheel is turning.
other
Pedelec drive
The thrust produced by the motor depends on three fac-
tors:
• 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 delivers more power
than if you were only pedalling gently.
The assistance increases disproportionally if you
pedal harder. This increase is more pronounced
in the POWER mode than in the SPORT and ECO
modes.
The thrust is limited by the maximum motor output.
Impulse
pedal power and
Propulsive power (pedal force +
electrical assistance)
Pedal force
Speed
24 V User Manual Impulse Pedelec
Increasing
assistance
Electrical assistance
Max. assistance
• The level of assistance you have selected
With the POWER assist level, the motor assists you
by producing its maximum output, which also con-
sumes the most energy. With the SPORT assist lev-
el, the motor produces slightly less power. If you
have selected ECO, you receive the least amount of
assistance but have the battery's maximum range
at your disposal.
POWER
HIGH
SPORT
MIDDLE
ECO
LOW
STANDBY
Pedalling torque
• How fast you ride
When you set off on your Pedelec, the assistance
increases as you build up speed until it reaches its
maximum, just before the highest assisted speed is
achieved. The assistance then reduces automatical-
ly until you reach a speed of roughly 25 km/h when
it switches off. This gradual reduction makes the
transition to riding without power assist seem less
abrupt. This applies for the three highest gears.
In all other gears, the motor switches off earlier,
depending on the gear ratio. ➠ Chapter 3 "Special
features of the Pedelec with Impulse drive" contains
a table which shows the speeds at which the motor
is switched off.
Reducing Assistance
assistance
switched off
Switch-off speed