Communications: electrical – Selective – Having indication or alarm
Patent
1983-10-25
1985-07-16
Caldwell, Sr., John W.
Communications: electrical
Selective
Having indication or alarm
34087033, 340626, 731465, 200 6126, B60C 2300
Patent
active
045299617
ABSTRACT:
A wheel-mounted tire pressure sensor employs a Bourdon tube which deforms in relation to tire pressure to drive a pivotal arm. Opposite ends of the arm support magnets which can close reed switches arrayed around the path of travel of the magnets. The reed switches are connected to passive resonators in such a way that for each of a number of regions of travel of the arm, a unique combination of resonators is activated. The resonators are connected to a wheel-mounted antenna which faces a stationary antenna. Frequency signal matching the frequencies of the resonator are sequentially broadcast by the stationary antenna to the resonators, which are excited to oscillate if activated by the corresponding switch or switches. The excited resonator broadcast their frequencies back to the stationary antenna and to a display unit which decodes the combination of resonator frequencies to display the corresponding tire pressure. An optional alarm unit includes a memory unit which holds maximum safe speed values for each of the detectable ranges of tire pressure. The sensed tire pressure is converted to the corresponding speed limit value which is then compared to the sensed vehicle speed. If actual vehicle speed exceeds the preset safe value, an alarm is generated.
REFERENCES:
patent: 3930223 (1975-12-01), Tsagas
patent: 4119944 (1978-10-01), Smith
patent: 4157530 (1979-06-01), Merz
patent: 4163208 (1979-07-01), Merz
patent: 4174515 (1979-11-01), Marzolf
patent: 4237445 (1980-12-01), Crossman
patent: 4312001 (1982-01-01), Marzolf
patent: 4348896 (1982-09-01), Sarides
Nishimura Hiroaki
Suzuki Yutaka
Caldwell Sr. John W.
Heim Michael F.
Nissan Motor Company Limited
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