发明名称 |
MOTOR VEHICLE WITH OCCLUSION DETECTION FOR ULTRASONIC SENSORS |
摘要 |
In a method for checking a first ultrasonic sensor of a motor vehicle for an occlusion, a measuring signal of the first ultrasonic sensor is acquired by an evaluation unit, and from the measuring signal, a decay time of a natural oscillation of the diaphragm of the first ultrasonic sensor, brought about by an excitation pulse, is ascertained. From the measuring signal of either the first ultrasonic sensor or a second ultrasonic sensor, an echo produced by an object located in a sensing range of the first ultrasonic sensor is ascertained, and a distance value of the object is determined on the basis of the echo. An occlusion is signaled if the decay time is less than a predetermined threshold value which would be exceeded if ice and/or dirt were to adhere directly to the diaphragm, and if the distance value is less than a predetermined maximum value. |
申请公布号 |
EP3069166(A1) |
申请公布日期 |
2016.09.21 |
申请号 |
EP20140793511 |
申请日期 |
2014.10.30 |
申请人 |
VOLKSWAGEN AKTIENGESELLSCHAFT |
发明人 |
MOSSAU, DANIEL;BAUMANN, PETER;CARSTEN, HEINECKE;TANNER, MANUEL;SANNY, KNUT |
分类号 |
G01S15/93;G01S7/52;G01S7/56;G01S15/87 |
主分类号 |
G01S15/93 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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