Deceleration curve for approaching target distance?

We've been playing with different ways to solve the problem of "drive smoothly and quickly to a distance X away from the wall".

What about applying a simple deceleration factor with a curve?

Consider a DriveWithDecelerationCurve command:

The operator is driving at a set speed forward (e.g. 70%).

inputSpeed = 0.7

Measure the distance from the wall. Compare it to some threshold we can set (say, 1 meter). If we're nowhere near the wall, allow the motors to go at the full commanded speed.

If distance > Threshold
outputSpeed = inputSpeed

If the distance is less than the threshold then start comparing the distance to the target and scale the input speed using a curve. For example:

outputSpeed = inputSpeed * (1 / distance)

or

outputSpeed = inputSpeed * (1 - (1 / distance) )

So the closer and closer we get to the target distance the more and more we slow down the target speed.