METHOD FOR CALIBRATING ULTRASONIC TRANSDUCERS AND SYSTEM FOR CARRYING OUT THE METHOD
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Abstract
A method for calibrating ultrasonic transducers, the ultrasonic transducers being situated at known distances or at known ratios of the distances from one another, preferably in a bumper of a motor vehicle, and one of the ultrasonic transducers is operated in a transmission mode, and at least one other ultrasonic transducer is operated in a receiving mode.
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Citations
26 Claims
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1-12. -12. (canceled)
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13. A method for calibrating ultrasonic transducers, the ultrasonic transducers being situated at known distances from one another or at known ratios of the distances from one another, the method comprising:
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operating one of the ultrasonic transducers in a transmission mode, and operating at least one other ultrasonic transducer in a receiving mode; inferring a production- and/or operation-induced measuring accuracy of the ultrasonic transducer operated in the receiving mode on the basis of an actual signal propagation time and the known distance or a distance ratio between the ultrasonic transducer operated in the transmission mode and the ultrasonic transducer operated in the receiving mode; and as a function of the actual signal propagation time, providing the signal of the ultrasonic transducer operated in the receiving mode with a correction value. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A system for calibrating ultrasonic sensors, the system including at least three ultrasonic transducers situated at known distances with respect to or at a known distance ratio with respect to one another, the at least three ultrasonic transducers not being situated on a shared axis, the system configured to:
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operate one of the ultrasonic transducers in a transmission mode, and operate at least one other ultrasonic transducer in a receiving mode; infer a production- and/or operation-induced measuring accuracy of the ultrasonic transducer operated in the receiving mode on the basis of an actual signal propagation time and the known distance or a distance ratio between the ultrasonic transducer operated in the transmission mode and the ultrasonic transducer operated in the receiving mode; and as a function of the actual signal propagation time, provide the signal of the ultrasonic transducer operated in the receiving mode with a correction value. - View Dependent Claims (23, 24, 25, 26)
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Specification