发明授权
US07493991B2 Electromagnetic/ultrasonic roll-calling/answering (EURA) system for elevator positioning 失效
用于电梯定位的电磁/超声波滚动呼叫/应答(EURA)系统

Electromagnetic/ultrasonic roll-calling/answering (EURA) system for elevator positioning
摘要:
A positioning system for an elevator cab (37) includes transponder modules (10) having a unique ID for receiving a signal (39) and emitting an ultrasonic signal when the signal is equivalent to the unique ID with a determination of position based on the time duration of the signals.
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