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US 7,095,316 B2Granted
Tire pressure monitoring system transmission protocol
AssigneeSiemens VDO Automotive Corporation
InventorsPatricia Kachouh, Tejas B. Desai, Kurt VanDrus
Life of this patent
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Abstract
A system for monitoring conditions within a tire includes a sensor assemblies (14). The sensor assemblies (14) emit a transmission (26) containing information indicative of conditions within a tire to a receiver (16). The transmission (26) from the sensor assemblies (14) includes an amplitude shift key wake up portion and various data packet portions. The data packet portions are separated by a variable interval to prevent collisions of transmissions at the receiver.
Claims25
A system for monitoring conditions within a tire comprising;
- a sensor disposed within a tire for sensing conditions within said tire;
- a transmitter for transmitting a signal indicative of conditions within said tire;
- a receiver for receiving said signal;
- said signal indicative of conditions within a tire includes a first preamble portion and at least one data packet portion wherein there is a variable interval between the at least one data packet portions, wherein said variable interval varies according to the equation Interval length=Standard length+(beta * standard length)
- Where:
- interval length is the length of time in ms between data frames;
- standard length is a predetermined duration of time in ms;
- and
- Beta is a random variable with a value between 0 and 1.
6 more elements
Dependencies are inferred from the claim text.