Wireless weighing system
US4969112A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 14, 1988 |
| Grant date | Nov 6, 1990 |
| Priority date | — |
| Expiry date | Oct 14, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01G19/025
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.