Measuring and testing – Instrument proving or calibrating – Speed – velocity – or acceleration
Reexamination Certificate
2000-06-02
2001-10-09
Raevis, Robert (Department: 2856)
Measuring and testing
Instrument proving or calibrating
Speed, velocity, or acceleration
Reexamination Certificate
active
06298709
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a sensor device.
BACKGROUND OF THE INVENTION
A sensor device with a testing module that checks the sensor device for a possible malfunction is described in German Patent No. 44 47. This testing module must be activated externally by actuating a test input. In doing so, the sensor is detuned in the testing phase by an interference signal. The interference signal corresponds to a specific value of a measured variable to be tested.
SUMMARY OF THE INVENTION
In contrast, the device according to the present invention has the advantage that it represents an inherently reliable sensor that continuously carries out a self-test and accordingly identifies malfunctions in the mechanical and/or electronic systems without detuning the sensor and thereby influencing the measurement function. At the same time, no external triggering and no external additional circuitry is necessary; a three-pin terminal connection (voltage supply+signal output) can be implemented. As a result, there exists downward compatibility with already existing sensors that do not have a self-test module and have such a connection. These existing sensors can be advantageously replaced by the device according to the invention.
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Artzner Johannes
Bauer Wolfram
Kenyon & Kenyon
Raevis Robert
Robert & Bosch GmbH
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