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发明公开
CN105683777A 具有用于超声波传感器的遮挡识别的机动车 有权

具有用于超声波传感器的遮挡识别的机动车
摘要：
本发明涉及一种用于检查机动车(10)的第一超声波传感器(HL、HLM)是否被遮挡的方法，方法是通过分析单元(20)检测第一超声波传感器(HL、HLM)的测量信号，并且根据测量信号确定膜片的由激励脉冲导致的自振的衰减时间，并且通过测量信号或第二超声波传感器的测量信号测得由布置在第一超声波传感器(HL、HLM)的检测范围(26、28)中的物体(32)所产生的激励脉冲的回声，并且根据回声确定物体(32)的间距值。本发明要解决的技术问题在于，可靠地识别超声波传感器(HL、HLM)的遮挡。如果衰减时间小于预设的界限值并且间距值小于预设的最高值，则通过分析单元(20)通知有遮挡，其中，如果冰和/或污物直接附着在膜片上，则衰减时间会超出预设的界限值。
摘要（英）：

The invention relates to a method for checking a first ultrasonic sensor (HL, HLM) of a motor vehicle (10) for an occlusion, in that a measurement signal of the first ultrasonic sensor (HL, HLM) is recorded by an evaluation unit (20) and an attenuation time of a natural oscillation caused by an excitation pulse of the membrane of the first ultrasonic sensor (HL, HLM) is determined from the measurement signal. An echo generated by an object (32) arranged in a detection area (26, 28) of the first ultrasonic sensor (HL, HLM) is determined from the measurement signal or from a measurement signal of a second ultrasonic sensor, and a measurement value of the object (32) is determined based on the echo. The problem addressed by the invention is to reliably detect an occlusion of an ultrasonic sensor (HL, HLM). The occlusion is signalled by the evaluation unit (20) in the case where the attenuation time is lower than a predetermined threshold value which would be exceeded in the case that ice and/or dirt were to adhere directly to the membrane, and the distance measurement is lower than a predetermined maximum value.

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