Communications: electrical – Selective – Having indication or alarm
Patent
1979-12-26
1982-02-16
Caldwell, Sr., John W.
Communications: electrical
Selective
Having indication or alarm
731465, 235 92PE, 340512, 340526, 340539, 340626, B60C 2302, G08B 2100
Patent
active
043161766
ABSTRACT:
Tire pressure monitors are incorporated in vehicles having penumatic tires (14) to continuously or periodically measure the air pressure within the tires and to alert the driver should the pressure in one of the tires fall below a predetermined value. A self-contained battery powered rf transmitter unit (10) is affixed within the drop center (22) of each wheel (12) and includes a pressure sensing switch (84). The battery is contained within a housing (20) mounted to the external surface of the wheel adjacent a fill valve (30) through which electrical wires (50) are routed to the transmitter (11). The transmitter emits a pulse every 33 seconds when the air pressure within the tire is above a prescribed value. A receiver (13), located in the passenger compartment of the vehicle, receives the signal(s) from the transmitters and counts the number of signals received over a given time period established by an internal pulse generator. If fewer than a predetermined number of pulses are received during any given time period, a fault condition is indicated and the driver is appropriately warned. The system also has self-check features wherein upon start-up of the associated vehicle, a warning light (320) and buzzer (322) are turned on until the first correct sequence of signals are received from the transmitters.
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Gee Thomas A.
Tremba Joseph A.
Caldwell Sr. John W.
Eaton Corporation
Lewis J. G.
McCloskey R. J.
Nowicki Joseph E.
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