Method for Functionally Testing an Ultrasonic Sensor
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Abstract
A method for functionally testing an ultrasonic sensor in which at least one additional ultrasonic sensor transmits an ultrasound signal, and a functioning of the first sensor is ascertained when the amplitude of the signal transmitted by the first sensor without being reflected off of an external obstacle exceeds a predefined, variable limit value.
20 Citations
20 Claims
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1-10. -10. (canceled)
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11. A method for functionally testing a first ultrasonic sensor of a distance measuring device having at least two ultrasonic sensors, comprising:
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conducting a signal transmitted by a second ultrasonic sensor of the distance measuring device to the first ultrasonic sensor without being reflected off of an external obstacle; when the first sensor receives the signal transmitted by the second sensor, ascertaining a functioning of the first sensor; and ascertaining a reception when an amplitude of the signal from the second sensor received by the first sensor exceeds a variable limit value. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A distance measuring device comprising:
at least two ultrasonic sensors which are installed in such a way that an ultrasound signal transmitted by a second ultrasonic sensor is able to be received by a first ultrasonic sensor without being reflected off of an external obstacle, a variable memory for storing an amplitude value being included in the first sensor, the signal received from the second sensor without being reflected off of an external obstacle being compared with the stored amplitude value in such a way that only in the case of an exceedance of the stored amplitude value is a functioning of the first ultrasonic sensor ascertained.
Specification