Driveability Features - Sevcon Gen4 Applications Reference Manual

Dual Throttle Inputs
Single and dual throttle inputs are supported.
Single throttle inputs are normally used with other interlock inputs (eg FS1, deadman, etc) and
use a single input voltage to determine driver demand.
Dual throttle inputs use two separate input voltages, each of which is converted to a throttle
value using 2910 , sub indices 3 to 6 (throttle input 1) and sub indices 7 to 10 (throttle input 2). If
h
the throttle values differ by more than 5%, a throttle fault is set and the system will not drive.
To enable dual throttle functionality, map a second analogue input to 2224
for the second throttle input can be read at 2626
Dual throttle systems allow a virtual FS1 feature, which can be used instead of an actual FS1
switch. This feature can be enabled on dual throttle systems using 2910
CAUTION: The voltage input characteristics of the two analogue throttle inputs must be different.
Creep Torque
Set creep torque at 291f
as the throttle is closed. This can be used on some vehicles to overcome the friction required to
achieve initial vehicle movement.
Creep
torque
Throttle value
Figure 27 - Illustration showing behaviour of creep torque
Increasing the creep torque level can improve how the vehicle feels when drive is first selected
and the vehicle starts to move. However, too much creep torque can make the vehicle
uncontrollable at low speeds.
CAUTION: Creep torque will be applied as soon as drive is selected and the throttle is closed.
Do not increase the creep torque value to a level that would cause unexpected high levels of
torque output for comparatively low levels of throttle push. If in doubt, set the creep torque level
to 0%.

Driveability Features

CAUTION: These features are used to configure how the system uses throttle information and
how it handles speed limits (in torque mode). The installer must ensure these features are
configured appropriately.
6-22
. Creep torque allows a small amount of torque to be applied as soon
h
.
h
Max
torque
. The throttle value
h
, 1.
h