Absolute angular position sensing system based on radio frequency identification technology
First Claim
1. A system for providing RF interrogation, said system comprising:
- at least one wheel;
a plurality of RFID tags disposed about an outer perimeter of the at least one wheel; and
an RFID transceiver positioned adjacent to the at least one wheel, said RFID transceiver transmitting an interrogation signal to the at least one wheel that activates the RFID tags and causes the RFID tags to transmit a coded signal that is received by the transceiver and identifies the position of the wheel as it rotates.
12 Assignments
0 Petitions
Accused Products
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.
19 Citations
20 Claims
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1. A system for providing RF interrogation, said system comprising:
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at least one wheel; a plurality of RFID tags disposed about an outer perimeter of the at least one wheel; and an RFID transceiver positioned adjacent to the at least one wheel, said RFID transceiver transmitting an interrogation signal to the at least one wheel that activates the RFID tags and causes the RFID tags to transmit a coded signal that is received by the transceiver and identifies the position of the wheel as it rotates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for determining the position of a crankshaft wheel in an internal combustion engine, said system comprising:
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a plurality of RFID tags disposed about an outer perimeter of the crankshaft wheel; and an RFID transceiver positioned adjacent to the crankshaft wheel, said RFID transceiver transmitting an interrogation signal to the crankshaft wheel that activates the RFID tags and causes the RFID tags to transmit a coded signal that is received by the transceiver and identifies the position of the wheel as it rotates. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A system for determining the position of at least on camshaft wheel in an internal combustion engine, said system comprising:
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a plurality of RFID tags disposed about an outer perimeter of the at least one camshaft wheel; and an RFID transceiver positioned adjacent to the at least one camshaft wheel, said RFID transceiver transmitting an interrogation signal to the at least one cam shaft wheel that activates the RFID tags and causes the RFID tags to transmit a coded signal that is received by the transceiver and identifies the position of the wheel as it rotates. - View Dependent Claims (17, 18, 19, 20)
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Specification