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Method and apparatus for identifying ice-covered electroacoustic sensor

A technology of electroacoustic sensor and ultrasonic sensor, which is applied in the direction of instruments, alarms, and re-radiation, and can solve the problems of complex and expensive sensing devices

Inactive Publication Date: 2018-07-17
ROBERT BOSCH GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, it is known from the prior art that ice-covered sensors can be deduced from a temperature sensor on the membrane, but the installation of the additional sensor devices required for this close to the membrane is very expensive and complicated

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  • Method and apparatus for identifying ice-covered electroacoustic sensor
  • Method and apparatus for identifying ice-covered electroacoustic sensor
  • Method and apparatus for identifying ice-covered electroacoustic sensor

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Embodiment Construction

[0029] In the following embodiments, the same features are indicated by the same reference numerals.

[0030] exist Figure 1a An electroacoustic sensor 1 is shown in , comprising a housing 10 , a membrane 20 for receiving and / or transmitting acoustic vibrations, a temperature sensor 80 in a sensor interior 15 and a computing unit 95 . In addition, a decoupling ring 60 is shown, which can be mounted between the diaphragm pot 25 and the bumper 40 in order to seal off the sensor on the one hand and to decouple the sensor 1 from the bumper 40 with respect to mechanical vibrations on the other hand. . As shown in the first embodiment, the computing unit 95 and the temperature sensor 80 can be contacted on the printed circuit board 70 in the sensor interior. The conductor tracks of the printed circuit board 70 are supplied with current, for example via a cable 90 . During sensor operation, the supplied electrical energy is first converted into heat at the contact points of the pr...

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Abstract

A method for identifying a snow- or ice- (40) covered diaphragm (20) of an electroacoustic sensor (1), particularly of an ultrasonic sensor, on a vehicle is proposed. The method comprises the following steps: a.) A time-based temperature profile for an interior (15) of the electroacoustic sensor (1) is ascertained after the beginning of sensor operation by a temperature sensor (80) that is arranged in the interior (15) of a housing (10) of the sensor. The temperature of the sensor interior (15) is below 0 DEG C at the beginning of sensor operation. b.) A second temporal range of the ascertained temperature profile is identified by a computation unit (95), in which range the temperature increase falls significantly in comparison with a first range at a preceding time. c.) If a temporal range of this kind is identified, then it is inferred that the diaphragm (20) of the electroacoustic sensor (1) is covered with snow or ice (40). d.) If it has been identified that a diaphragm (20) of theelectroacoustic sensor (1) is covered with snow or ice (40), then a warning is output to the driver.

Description

technical field [0001] The invention relates to a method and a device for an electroacoustic sensor for identifying ice cover. According to another aspect, the invention relates to an electroacoustic sensor. Background technique [0002] In winter, when the vehicle is freely parked, it can result that the electroacoustic sensor, which is a component of the driver assistance system, eg as a distance sensor, is covered with ice or snow under corresponding weather conditions. If the electroacoustic sensor has an outwardly oriented diaphragm for emitting and / or receiving sound waves, an ice or snow coating on the diaphragm of the electroacoustic sensor can lead to the fact that the diaphragm of the sensor is no longer able to vibrate freely And thus less energy is converted into sound. In this case, the transmitted pulse will be weaker than designed and the arriving sound will excite the diaphragm to vibrate weaker than it would be without the coating. Furthermore, the sound ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/52G01S15/93G08B19/02G01S7/521G01S15/931
CPCG01S15/931G08B19/02G01S2015/938G01S2007/52009G01S7/521G01S7/52004B60Q9/00
Inventor M·舍恩赫尔M·施耐德
Owner ROBERT BOSCH GMBH
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