6 — VEHICLE PERFORMANCE ADJUSTMENT
1212 & 1212P Manual - Sep 2019
pg. 32
Step 6: Setting the acceleration and deceleration rates
The acceleration and deceleration functions have been designed to provide smooth throttle response
when maneuvering at low speeds and snappy throttle response when traveling at high speeds. This
is accomplished by defining acceleration/deceleration rates at each end of the speed limit pot’s
range. The rates are scaled linearly between these two endpoints. Four pairs of parameters define
the endpoints of the acceleration/deceleration curves:
Forward acceleration: Accel Min Speed — Accel Max Speed
Forward deceleration: Decel Low Speed — Decel High Speed
Reverse acceleration: Rev Accel Min Speed — Rev Accel Max Speed
Reverse deceleration: Rev Decel Low Speed — Rev Decel High Speed.
The programmed acceleration and deceleration rates are independent of mode. However, it makes
sense to adjust the low speed rates under the slowest speed conditions (Mode 1) and the high speed
rates under the fastest speed conditions (Mode 2). Tuning the rates under the most extreme (slowest,
fastest) conditions will most likely result in good performance throughout the entire driving range.
Note: Smaller values provide faster response.
Forward acceleration and deceleration rates
a. First, adjust Accel Min Speed. Select Mode 1 and set the speed limit pot to its minimum
speed position. For low speed testing, we suggest that you drive in a confined area such as an
office, where low speed maneuverability is crucial. Depending on how you liked the forward
acceleration you experienced, increase or decrease the Accel Min Speed value. Continue testing
and adjusting this value until you are satisfied with the vehicle’s low speed forward acceleration.
b. Now adjust Decel Low Speed. Driving at full throttle with the speed limit pot still in its minimum
speed position, release the throttle to neutral. Depending on how you liked the deceleration you
experienced, increase or decrease the Decel Low Speed value. Continue testing and adjusting this
value until you are satisfied with the vehicle’s low speed forward deceleration.
c. Next, adjust Accel Max Speed. Select Mode 2 and set the speed limit pot to its maximum
speed position. Apply full throttle. Depending on how you liked the forward acceleration you
experienced, increase or decrease the Accel Max Speed value. Continue testing and adjusting
this value until you are satisfied with the vehicle’s high speed forward acceleration.
d. Driving at full throttle with the speed limit pot still in its maximum speed position, release the
throttle to neutral. Depending on how you liked the deceleration you experienced, increase or
decrease the Decel High Speed value. Continue testing and adjusting this value until you are
satisfied with the vehicle’s high speed forward deceleration.
Reverse acceleration and deceleration rates
e, f, g, h. Adjust Rev Accel Min Speed, Rev Decel Low Speed, Rev Accel Max Speed, and Rev Decel
High Speed using the same procedures as for the corresponding Forward parameters.