Ramp Shape (Static Throttle Map) - Curtis MultiMode 1228 Manual

3 — PROGRAMMABLE PARAMETERS:
Fig. 11
Ramp shape
(throttle map) with maxi-
mum speed set at 100%.
26
Throttle Parameters
one-to-one ratio—in other words, no throttle gain adjustment. A setting of
10.0 would allow use of a pot with a range of only 1/10th of 5kΩ, i.e., 500
ohms. For most applications, throttle gain settings between 1.0 and 2.0 will
work best.
Note: The throttle characteristics are defined in terms of wiper voltage
rather than throttle pot resistance because of the range of pot values that can
be used and the variation between pots of the same value.
Detailed guidelines for adjusting the throttle gain parameter are presented
in Section 4.
RAMP SHAPE
The ramp shape parameter determines the static throttle map of the control-
ler. This parameter modifies the throttle input to the controller, and hence the
vehicle's response. Setting the ramp shape parameter at 50% provides a linear
response to throttle position. Values below 50% reduce the throttle command
at low throttle positions, providing enhanced slow speed maneuverability. Values
above 50% give the vehicle a faster, jumpier feel at low throttle positions.
The ramp shape can be programmed to values between 20.0% and 70.0%.
The ramp shape number refers to the throttle command at half throttle. For
example, if maximum speed is set at 100%, a ramp shape of 40% will result
in a 40% throttle command at half throttle. The 50% ramp shape corresponds
to a linear response. Six ramp shapes (20, 30, 40, 50, 60, and 70%) are shown
as examples in Figure 11.
100
90
80
70
60
50
40
30
20
10
0
0 10 20 30
THROTTLE POSITION (percent)
MAX. SPEED (100%)
40 50 60 70 80
RAMP SHAPE
70%
60%
50%
40%
30%
20%
90 100
Curtis 1228 Manual,
Rev. F