Method and device for detecting a malfunction of an ultrasonic transducer by evaluating an impedance envelope

A technology of ultrasonic transducers and envelopes, applied in the directions of sound wave re-radiation, instruments, and utilization of re-radiation, etc., can solve problems such as not providing satisfactory solutions, and achieve the effect of improving reliability

Active Publication Date: 2015-07-29
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The methods known in the prior art do not provide a satisfactory solution for checking an ultrasound transducer in ongoing operation for said functional impairment

Method used

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  • Method and device for detecting a malfunction of an ultrasonic transducer by evaluating an impedance envelope
  • Method and device for detecting a malfunction of an ultrasonic transducer by evaluating an impedance envelope
  • Method and device for detecting a malfunction of an ultrasonic transducer by evaluating an impedance envelope

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Embodiment Construction

[0022] figure 1 A block diagram of the device 10 for distance measurement according to the invention is shown in an advantageous embodiment. The device 10 for distance measurement comprises an ultrasonic transducer 11 and a processing unit 12 , and a storage medium 13 for providing a reference envelope 31 , wherein the processing unit 12 is provided for carrying out the method according to the invention. The ultrasonic sensor includes device 10 .

[0023] The ultrasound transducer 11 is an electroacoustic sound transducer and is connected to the processing unit 12 via a first signal line 14 and a second signal line 15 . The storage medium 13 is suitable for storing one or more digital or analog values ​​and providing them to the processing unit 12 .

[0024] In terms of electricity, the ultrasonic transducer 11 is composed of a parallel resonant circuit and a series resonant circuit. The associated impedance signal 20 has a characteristic profile with respect to the excitat...

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Abstract

The present invention relates to a method and a device (10) for detecting malfunction of an ultrasonic transducer (11). The method comprises the steps of applying the ultrasonic transducer (11) with an excitation signal, a determining of an impedance signal (20), which describes the impedance of the ultrasonic transducer (11) with respect to the excitation signal, a generating an impedance envelope (21) of the impedance signal (20 ), and of comparing the impedance envelope (21) with a reference envelope (31), wherein a malfunction is detected if the impedance envelope (21) is not equal to the reference envelope (31). In particular, the excitation signal in this case comprises a plurality of frequencies, in particular a sweep, whereby the process can also be carried out during a transmission operation of the ultrasonic transducer (11). Thus, a particularly reliable method for detecting a malfunction of the ultrasonic transducer is provided which can be carried out for a distance measurement by means of the ultrasonic transducer. The method is stable against misstatement or individual impedance values of the impedance signal.

Description

technical field [0001] The invention relates to a method and a device for detecting faults of an ultrasound transducer. Background technique [0002] Driver assistance functions based on ultrasonic sensors have been known and used in large quantities for a long time. In this case, conventional parking assistance devices, ie distance measurement by means of corresponding signaling to the driver of the vehicle, are increasingly supplemented with more complex functions, such as parking assistance, with longitudinal guidance of the vehicle Semi-automatic parking with intervening lateral guidance and braking intervention during maneuvering at low speeds. [0003] In such a system, ultrasonic sensors or ultrasonic transducers send signals into the vehicle environment, and convert the signals reflected by environmental objects into electrical signals, which are analyzed and processed by the analysis and processing unit in terms of propagation time, amplitude, etc. . Due to the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/52G01S15/931
CPCG01S7/52004G01S7/52006G01S2007/52009G01S15/931
Inventor B·谢尔瓦特M·舒曼P·迈尔D·施密德T·特肋普托
Owner ROBERT BOSCH GMBH
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