Communications: electrical – Selective – Having indication or alarm
Patent
1974-05-09
1976-08-10
Waring, Alvin H.
Communications: electrical
Selective
Having indication or alarm
200 6125, B60C 2302
Patent
active
039744779
ABSTRACT:
An improved tire pressure monitoring system and method for detecting, for example, high pressure or low pressure of automobile tires utilizing uniquely designed magnetic coupling means for transmitting the tire high or low pressure from the rotating tire to the relatively stationary, non-rotating portion of the vehicle for indication of the state of the pressure on the operating panel of the vehicle. The novel tire pressure monitoring system is usually located on the wheel and brake drum assembly for all types of vehicles, monitoring the pressure for the appropriate vehicle tire (FIG. 1). The system includes a means for monitoring the pressure in the pneumatic tire, usually coupled directly to the tire stem. The system also includes an electrical conductor from the pneumatic pressure monitor means to ferrous core means, the composition of whose core is a material that has a relative normal permeability that is high, which is mounted on the rotating wheel hub and for which the electrical conduction means is wound around the ferrous core means forming a coil for the ferrous core means. The system also includes permanent magnet means mounted on the non-rotation axle of the wheel which magnetically couples to said ferrous core means to transmit any changes of said pressure monitoring means from the rotating tire to the relatively stationary (non-rotating) portion of the vehicle and transmits this information to alarm circuit means. The switch assembly means includes pick off coil means wrapped around the permanent magnet means to transmit signals from the pressure monitor means to the alarm circuit means by detecting changes in permeability of the ferrous core means, based on the principle of Lenz's Law.
REFERENCES:
patent: 2629086 (1953-02-01), Ainsworth et al.
patent: 3093812 (1963-06-01), Brown
patent: 3374460 (1968-03-01), Massoubre
patent: 3602884 (1971-08-01), Brumbelow
patent: 3614732 (1971-10-01), Lejeune
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