Tire air-pressure reduction detecting apparatus

Details Tire air-pressure reduction detecting apparatus Tire air-pressure reduction detecting apparatus

1994-11-30

1998-01-20

Hofsass, Jeffery

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340442, 731464, 731465, 116 34R, B60C 2300

Patent

active

057105391

ABSTRACT:
In accordance with a tire air-pressure reduction detecting apparatus of the present invention, if it is judged that the tires all have a normal air pressure, it is judged whether or not a count value (C) is not less than a steady-state count (L.sub.2), and then if the count value (C) is not less than the steady-state count (L.sub.2), a counter (CNT) is decremented. That is, the count value (C) is kept to the steady-state count (L.sub.2) at the lowest, from which incrementation is started. On the other hand, if it is judged that a tire air pressure is reduced, it is judged whether or not the count value(C) is less than an upper counting limit (L.sub.1), and then if the count value (C) is less than the upper counting limit (L.sub.1), the counter (CNT) is incremented. That is, the count value (C) is kept to the upper counting limit (L.sub.1) at the highest, from which decrementation is started. Then, if the count value (C) is not less than a warning threshold count (N.sub.1), a warning is issued, and if the count value (C) is less than a warning stopping threshold count (N.sub.2), the warning is stopped. Thus, the frequency of the issuance of erroneous warnings can be reduced.

REFERENCES:
patent: 5218862 (1993-06-01), Hurrell, II et al.
patent: 5248957 (1993-09-01), Walker et al.
patent: 5343741 (1994-09-01), Nishihara et al.
patent: 5483220 (1996-01-01), Kushimoto
European Search Report and Annex.

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