Method of compensating for gauge hysteresis
AssigneeDelco Electronics Corporation
InventorDouglas J. King
Life of this patent
Estimating the term…
Abstract
Gauge inaccuracy due to hysteresis or lag during movement in one direction in response to a drive signal is overcome by predicting the amount of lag, which is a function of the desired amount of movement as measured from the farthest point attained during movement in the opposite direction, and adding the predicted lag to the drive signal.
Claims5
A method of overcoming hysteresis in a gauge having a pointer movable in clockwise and counter-clockwise directions to a position defining gauge angle and defining a turn-around angle at each change in direction, the gauge operated by a microcontroller wherein an input signal to the microcontroller commands a current gauge angle and the microcontroller repetitively determines a drive angle signal sufficient to compensate for a lag due to hysteresis, the method comprising the steps of:
- determining current angle from the input signal;
- determining current direction of pointer movement;
- determining the turn-around angle which is the farthest angle attained in the most recent previous direction;
- calculating the difference between the current angle and the turn-around angle;
- determining the lag as a function of the calculated difference;
- deriving the drive angle signal by summing the current angle and the lag;
- and
- applying the derived drive angle signal to the gauge.
Dependencies are inferred from the claim text.