Title:
【発明の名称】車両用タイヤ内の圧力低下に基づき無線送信可能な表示信号を生成する手段を有するバルブ
Document Type and Number:
Japanese Patent JP3302019
Kind Code:
B2
Abstract:
PCT No. PCT/EP94/00341 Sec. 371 Date Dec. 19, 1994 Sec. 102(e) Date Dec. 19, 1994 PCT Filed Feb. 7, 1994 PCT Pub. No. WO94/18018 PCT Pub. Date Aug. 18, 1994A valve which includes signal generating means generate a signal representing a pressure drop within a vehicle tire. The valve includes an absolute pressure sensor coupled to measure the pressure within the tire. A microprocessor is provided which upon activation following operation of the valve stores a value of the electric pressure signal from the pressure sensor in a memory. During operation of the vehicle, the stored reference electric pressure signal is compared with periodic measurements of pressure within the tire. The transmitter is activated at periodic intervals, whenever a given ratio between the compared values and a threshold value exceeds an upper or lower limit. The system is activated by a acceleration sensor which can detect when the vehicle is moving, thus avoiding power consumption stopped.
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Inventors:
Actel Holt, Liner
Application Number:
JP51764894A
Publication Date:
July 15, 2002
Filing Date:
February 07, 1994
Export Citation:
Assignee:
Alpha-Beta Electronics Akchen Gesell Shaft
International Classes:
B60C23/02; B60C23/00; B60C23/04; B60C29/00; (IPC1-7): B60C23/04; B60C23/02; B60C29/00
Domestic Patent References:
| JP6441405A | ||||
| JP484003U | ||||
| JP274204U |
Other References:
【文献】国際公開92/14620(WO,A1)
【文献】欧州特許出願公開417712(EP,A1)
【文献】欧州特許出願公開417704(EP,A1)
【文献】欧州特許出願公開417712(EP,A1)
【文献】欧州特許出願公開417704(EP,A1)
Attorney, Agent or Firm:
Hironobu Onda