Apparatus and method for alarming decrease in tyre air pressure

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EP 1 145 875 A8

(12)	CORRECTED EUROPEAN PATENT APPLICATION

(48)	Corrigendum issued on:
	30.01.2002 Bulletin 2002/05

(43)	Date of publication:
	17.10.2001 Bulletin 2001/42

(21)	Application number: 01303350.1

(22)	Date of filing: 10.04.2001

(51)	International Patent Classification (IPC)⁷: B60C 23/06

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

11.04.2000 JP 2000109524

(71)	Applicants:
	SUMITOMO RUBBER INDUSTRIES, LTD. Hyogo-ken (JP) SUMITOMO ELECTRIC INDUSTRIES, LTD. Osaka-shi, Osaka-fu (JP)

(72)	Inventors:
	Arita, Masakazu, c/o Sumitomo Rubber Ind. Ltd. Kobe-shi, Hyogo-ken (JP) Yanase, Minao, c/o Sumitomo Rubber Ind. Ltd. Kobe-shi, Hyogo-ken (JP)

(74)	Representative: Stewart, Charles Geoffrey
	Technical, Dunlop Tyres Ltd., Fort Dunlop Erdington, Birmingham B24 9QT Erdington, Birmingham B24 9QT (GB)

(54)	Apparatus and method for alarming decrease in tyre air pressure

(57) An apparatus for alarming decrease in tyre air-pressure on the basis of a rotational information obtained by tyres attached to a four-wheeled vehicle, comprising rotational information detecting means; memory means for storing the rotational information; calculation processing means for calculating a reciprocal number of a turning radius and calculating a judged value, first judging means for comparing the judged value with a reference value at every region of the turning radius; and second judging means for cancelling a judgement of decrease of internal pressure when a difference between the judged values in the right and left turning regions is different from a difference between reference judged values in the right and left turning regions which are obtained at a time of initialising run.