4QD Motor Speed Controller features
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Ramps

Acceleration Ramp

Even if the throttle is applied sharply, the controller must accelerate the motor smoothly, without a jerk, so an 'acceleration ramp' is built into all controllers. This may be a an adjustable ramp or a fixed ramp - although even a fixed ramp can be altered by changing a component value in the controller (usually a factory modification). Controllers without regenerative braking do not require a deceleration ramp - this is controlled solely by the motors and mechanics, not by the controller. If the ramp is too fast, the wheels might spin or, for example, a badly balanced golf buggy might tip over backawrds - especially on a hill!

Deceleration Ramp

Similarly when the throttle is released sharply, a controller with regenerative braking must decelerate the machine smoothly - this is controlled by the deceleration ramp. Too fast a ramp and the machine will skid to a stop.

In 4QD's controllers both these ramps are very smooth and very linear.

Adjustable Ramps

The rate at which the machine needs to accelerate (or decelerate) will depend upon the machine and how fast it is, so the reversing controllers have adjustable ramps. The adjustment is by two small (screwdriver operated) adjustments, one for accel, one for decel.

CR Ramp

The 2QD series do not have a linear ramp but a simple system controlled by a fixed resistor and capacitor (hence 'CR').

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