Title:
CIRCUIT FOR DETECTING STATE OF SEPARATE SWITCH CONTACT
Document Type and Number:
Japanese Patent JPS5647900
Kind Code:
A
Abstract:
A tire pressure monitoring system includes a tuned circuit with a pressure sensitive switch which is closed when the tire pressure is normal, connected across it, the tuned circuit and switch being mounted on the vehicle wheel. Mounted on a part of the vehicle is a detector circuit including an oscillator which includes an inductor which is at least intermittently coupled to the inductor of the tuned circuit. When the switch is closed the oscillator runs normally and its output is detected to indicate that all is well. When switch is open, however, the oscillator output is suppressed whenever the inductors are coupled together. The circuit can also be used in other applications where it is required to detect the state of an isolated switch.
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Inventors:
JIYON SUCHIYUAATO FUORESUTAA
DEIBITSUDO FURANSHISU SUUINDER
MAIKERU AASAA WAIRUDOSUMISU
DEIBITSUDO FURANSHISU SUUINDER
MAIKERU AASAA WAIRUDOSUMISU
Application Number:
JP12539480A
Publication Date:
April 30, 1981
Filing Date:
September 11, 1980
Export Citation:
Assignee:
LUCAS INDUSTRIES LTD
International Classes:
G08C19/00; B60C23/04; G08B23/00; H01H9/54; H03K17/00; (IPC1-7): G08C19/00; H01H9/54; H03K17/18