US 7,924,148 B2 · Robust radio frequency signals

Abstract

A tire pressure monitoring system includes a receiver for processing signals and alerting an operator of the vehicle should conditions within any of the tires fall outside a desired range. The transmitters within the tires emit shorter transmission signals during operation by eliminating transmission of the identification code. The receiver stores the identifier for each transmitter for comparison to subsequent transmissions. Subsequent transmissions do not include the identifier. The receiver combines the saved identifier with the value provided in the check portion of the incoming transmission. If the combination of the saved identifier with the value provided in the check portion meets a defined criteria, than the signal is recognized as originating from one of the transmitters.

Claims15

Dependent claims

A method of communicating radio frequency signals between a transmitter and a receiver comprising the steps of:

a) learning an identification code corresponding to a transmitter by storing the identification code in a receiver;
b) transmitting a signal with the transmitter that includes a checksum value determined without the identification code;
c) receiving the signal with the receiver and combining data from the learned identification code stored within the receiver with the received checksum value;
and
d) verifying that the signal is from an approved transmitter with the receiver responsive to the combination of the learned identification code and the checksum value resulting in an expected value.

2 more elements

Dependencies are inferred from the claim text.

Robust radio frequency signals

Life of this patent

Robust radio frequency signals

Life of this patent

Abstract

Claims15