Sevcon Gen4 - Driveability Profiles and Torque Control

Doc. # 177/52701
Rev3
6-26
If steering switches are used instead of a steering potentiometer, only part of the steering map is
used as shown in Table 6.
Value
Description
2913
h
,9
Outer wheel speed during inner wheel cutback
2913
h
,11
Outer wheel speed during inner wheel reversal
2913
h
,17
Inner wheel cutback speed
2913
h
,19
Inner wheel reverse speed
Table 6 Objects to set when using steering switches
NOTE: During a turn the inner wheel speed is slowed by power reduction instead of braking to
prevent the outer wheel motor working against the inner wheel motor.
Driveability profiles
WARNING: Ensure driveability profiles are disabled when not required. Activation of a
driveability profile can cause driving parameters to change.
Driveability profiles allow you to set maximum values for speed, torque, acceleration and
deceleration for use in a range of operational situations. In addition, in torque mode, there are
ramp rates for speed limits as well. and Figure 30 show the change in speed and torque target
under various driving conditions over a period of time.
Figure 29 Speed mode acceleration/deceleration
Time
Speed Target
Throttle
Accel Rate
Decel Rate
Dir Chg Decel Rate
Dir Chg AccelRate
Ntrl Brake
Decel Rate