Alarm system for monitoring pressurized vehicular tires
First Claim
1. An alarm system for monitoring a pressurized vehicle tire for its air mass comprising in combination, an air mass monitoring sensor within the tire for sensing mass of air within the tire and adapted to produce a continuous signal responsive to mass of air within the tire under normal and abnormal tire inflation conditions, a transmitter within the tire for transmitting a signal produced by the air mass sensor, a power generator within the tire activated by rotation of the tire for generating power for the transmitter and an antenna within the tire by which the signal transmitted to the transmitter may be radiated to a receiver located exterior of the tire.
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Abstract
Alarm system for monitoring pressurized vehicular tires for their gas mass, basically comprising a wheel unit for at least some of the tires of the vehicle, and a common receiver. Each wheel unit has an antenna made of a flexible material in the form of an open annulus, suitable to be snapped into and held by its resilience against the inner periphery of the respective tire, a continuous wire loop being embedded in the annulus for transmitting signals but optionally also for receiving power. At symmetrical location about the inside of the antenna, an electro-magnentic power generator module, a gas-mass monitoring sensor module, and a signal transmitter are mounted, electrically interconnected, for giving a preferably two-bit signal indication to the common receiver. The latter may have signal decoding and alarm circuitry to display at least two different conditions, namely a warning and an alarm condition. The transmitter modules in the wheel units and the common receiver may have circuitry for intermittently but continuously transmitting the two-bit signal so long as the gas mass monitored by the respective sensor module is within predetermined limits, the absence of one of the two signals being indicative within the receiver of the warning condition, while the absence of both signals results in the alarm condition. The invention is also intended to relate to the wheel unit, to the antenna, separately, to the electro-magnetic power generator therein, and to the gas mass sensor mentioned above.
133 Citations
11 Claims
- 1. An alarm system for monitoring a pressurized vehicle tire for its air mass comprising in combination, an air mass monitoring sensor within the tire for sensing mass of air within the tire and adapted to produce a continuous signal responsive to mass of air within the tire under normal and abnormal tire inflation conditions, a transmitter within the tire for transmitting a signal produced by the air mass sensor, a power generator within the tire activated by rotation of the tire for generating power for the transmitter and an antenna within the tire by which the signal transmitted to the transmitter may be radiated to a receiver located exterior of the tire.
Specification