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

7 Assistance by the electric motor

7.1

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
Assistance provided by the Impulse motor comparison
The thrust delivered 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 assis-
tance increases proportionally 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
Increasing pedal
Propulsive power (pedal force +
electrical assistance)
Pedal force
Speed
Relationship between pedal force and electrical assistance
26 VI User Manual | Impulse Ergo Pedelec
power and
assistance
Electrical assistance
Max. assistance
• The level of assistance you have selected.
In the power-assist mode POWER, the motor
assists you with the highest output and therefore
also uses the most energy. If you ride in the SPORT
mode, the motor produces slightly less power.
If you have selected ECO, you receive the least
amount of assistance but have the battery's maxi-
mum 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 and switches off at roughly 25 km/h, irrespective
of the gear you are in. Depending on the power-as-
sist mode you are riding in, the transition between
riding with and without power assist may seem
more or less abrupt. This applies for the three high-
est 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