C4 User Manual
Page 104 ©2021 Smartrise Engineering, Inc. All Rights Reserved October 25, 2021
4. From the DECELERATION menu, select the rate of deceleration.
Figure 135: DECEL Menu
5. Scroll right and press Save.
9.1.1.5 Decel Jerk In
The Deceleration Jerk In parameter controls the softness of the transition from constant
velocity to deceleration. Larger values resulting car occupants feeling a greater gravitational
force when rounding into constant deceleration. With larger jerk values, the car reaches
constant deceleration more rapidly; since the pattern spends less time in rounding reaches
leveling speed sooner.
The adjustment range is from 0.3-25 fps
3
.
• Default = 2 fps
3
• Units of measure = fps
3
The exact amount of time spent in rounding depends on the deceleration. Rounding time is
deceleration ÷ deceleration jerk in and should normally be adjusted between 0.6 to 1.3
seconds. You can easily set a one second rounding time by setting the jerk numerically equal to
the deceleration. If the deceleration is 2 fps
2
, a deceleration jerk in value of 2 fps
3
will provide
one second of deceleration rounding.
The following procedure describes how to set Decel Jerk In.
1. Navigate to MAIN MENU | SETUP | S-CURVE. See Figure 55.
2. From the S-CURVE menu, scroll and select the profile that is being adjusted. See Figure
127.
3. From the PROFILE menu, scroll and select Decel Jerk In.
Figure 136: NORMAL PROFILE Menu – Decel Jerk In
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