Invention Grant
- Patent Title: Absolute angular position sensing system based on radio frequency identification technology
- Patent Title (中): 基于射频识别技术的绝对角位置传感系统
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Application No.: US11743806Application Date: 2007-05-03
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Publication No.: US07683799B2Publication Date: 2010-03-23
- Inventor: Qi Ma
- Applicant: Qi Ma
- Applicant Address: US MI Detroit
- Assignee: GM Global Technology Operations, Inc.
- Current Assignee: GM Global Technology Operations, Inc.
- Current Assignee Address: US MI Detroit
- Agency: Miller IP Group, PLC
- Agent John A. Miller
- Main IPC: G08B21/00
- IPC: G08B21/00

Abstract:
A system for determining the position of a rotating wheel using RFID. In one embodiment, the system includes a position sensing wheel mounted to one or both of a crankshaft and a camshaft in the engine. A plurality of RFID tags are disposed at predetermined intervals around the wheel, and an RFID transceiver is positioned proximate the wheel. As the wheel rotates, the RFID transceiver transmits a signal that interrogates the RFID tags, which then transmit a coded signal to the transceiver identifying the wheel's position relative to the transceiver. Therefore, regardless of the position of the wheel, the RFID transceiver can interrogate the closest RFID tag and immediately know the position of the engine so that an engine controller can provide fuel and spark to the cylinders as soon as possible.
Public/Granted literature
- US20080272926A1 Absolute angular position sensing system based on radio frequency identification technology Public/Granted day:2008-11-06
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