| 摘要 |
A wireless weighing system for determining the weight of each wheel of a vehicle and for combinations and percentages thereof. Wheel weighing pads are placed under respective wheels of the vehicle and each contains a load cell whose analog output is converted to a digital value which can be transmitted to a central control. The communications technique uses infra-red radiation and a digital protocol which allows the central control to interrogate each individual weighing pad and receive a weight response without interference. The interrogation signal of the central control comprises a series of pulse envelopes containing high intensity IR pulses of a short duration where the duration of the envelope and position in the sequence indicates an address of a respective wheel pad. As each wheel pad is interrogated, it responds with an information signal, which comprises a series of pulse groups in an envelope containing high intensity IR pulses of a short duration where the duration of a pulse group indicates the presence or absence of a data bit in the sequence.
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