Friction Hysteresis
This is getting a different result for the same command value depending on the direction of approach. The difference between the speed you get while raising the throttle lever from below and the speed you get while lowering it from above measures this effect. Its source is friction in the cable and in the joints; in a good installation the difference is small and repeatable.
Hysteresis arises like this: while the actuator pulls the cable, the friction force works against the movement, that is, against the pull. While the actuator releases, the return spring closes the lever and this time friction opposes the work of the spring. In both cases the throttle lever lags behind the actuator's position by the amount of the friction — but in opposite directions. The result is a band between the command and the actual throttle opening.
The typical complaint in the field is this: I brought the potentiometer to the same mark but the speed came out different. The mechanics are looked at first. A route with sharp bends, a crushed sheath, a dirty or rusted joint, and a greased cable that has collected dust are the main causes.
The AS5600-based closed loop of the GS740-3P corrects the position of the actuator; it cannot see the friction beyond the cable. That is, position feedback does not eliminate hysteresis entirely; the mechanical route still has to be sound.
Context in which this term is used: Electronic speed and throttle control on diesel engines