Potentiometer diagnosis
AssigneePreh GmbH
InventorAnton Ruettiger
Life of this patent
Estimating the term…
Abstract
A diagnostic circuit for a potentiometer that connects a load resistor (laboratory resistor) to the slider of the potentiometer to allow a constant comparison of the contact resistance to measured values in the loaded and/or unloaded state when the slider is being adjusted, or when it is being paused at a critical point. This is accomplished by connecting a pull-up resistor to an input of the microprocessor, to which a load resistor is connected, and which is electrically connected to the slider. The slider itself is connected to an additional input of the microprocessor.
Claims6
A diagnostic circuit for a potentiometer, the diagnostic circuit comprising:
- a laminated plate;
- at least one supply track;
- at least one resistance track, which has a track beginning and a track end, whereby located between the track beginning and the track end is a transition area, over which a contact slider of the potentiometer moves;
- a microprocessor having a first input that is connected to the contact slider of the potentiometer;
- and
- a resistor that is electrically connected to the contact slider of the potentiometer and that is electrically connected to a second input of the microprocessor,
- wherein a contact resistance that is present at the slider during adjustment of the slider is measured in a cyclical measurement step and compared in the microprocessor with stored control values, and
- wherein, during the measurement step, the contact resistance is measured by the microprocessor in an unloaded state, in a loaded state with a supply voltage, and against a ground.
Dependencies are inferred from the claim text.