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专利名称：Device and process for detecting the
presence of a vehicle by means of anultrasonic device
发明人：Alexander C. Hermesmeyer申请号：US07/867703申请日：19920707公开号：US05263006A公开日：19931116
摘要：A device for detecting the presence of a vehicle by means of an ultrasonicdevice has an ultrasonic sensor (22) associated with an electronic transmitting andreceiving circuit (28, 30). The sensor (22) emits periodic pulses whose reflections arereceived and evaluated by the circuit (28, 30). A positive presence signal is emitted ifreflections are present. To ensure that a positive presence signal is always obtainedirrespective of the shape of the vehicle and of the part of vehicle which has just beenidentified, the ultrasonic device has a central sensor (22) and two external sensors (26, 28)situated equidistant from the latter and at the maximum possible distance apart. Theexternal sensors (25, 26) are connected identically and operated on a par with each other.Either the central sensor (22) is connected as the receiving sensor and the externalsensors (24, 26) as the emitting or vice versa.
申请人：HERMESMEYER; ALEXANDER C.
代理人：K. S. Cornaby
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