Passenger detection apparatus

Details Passenger detection apparatus Passenger detection apparatus

2001-05-22

2004-11-09

Dickson, Paul N. (Department: 3616)

Land vehicles

Wheeled

Attachment

C180S271000, C180S273000

Reexamination Certificate

active

06814370

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a passenger detection apparatus for detecting the existence of a passenger in an automobile for use in an airbag system, an antitheft system, etc.
An airbag expands between a passenger and a framework, such as a dashboard, etc., at the time of an automobile collision to protect the passenger. However, the airbag is expensive and the expansion thereof with no passenger involves a heavy economic burden. Hence, a control has been exercised by which an airbag is expanded depending on the existence of a passenger at the time of collision. Also, in case there is an intruder in an automobile, it is necessary to detect this occupancy and take a coping measure.
As a passenger detection apparatus for this purpose, for example, the one described in the Unexamined Japanese Patent Application Publication No. Hei 05-139233 is known. The construction of this apparatus will be explained with reference to FIG.
7
. In the figure, the reference numeral
540
depicts a rubber pad spread on an automobile seat,
550
a plurality of piezoelectric film sensors fixed to the pad
540
, and
560
a plurality of weight sensors fixed to the pad
540
.
Next, the operation will be explained. When a passenger sits on the seat, the piezoelectric film sensors in the portion on the passenger are flexed, then producing electrical pulses. Also, the weight sensors are flexed to cause a change in the resistance thereof. Thus, monitoring the output of the sensors
550
and
560
enables determination of the existence of a passenger and the boarding position of the passenger.
Since the conventional passenger sensor is arranged as above, a passenger cannot be detected unless the passenger is in the position in contact with the sensor. Therefore, there is a problem that, in order to detect the existence of a passenger even in case the passenger boards in a position out of a normal boarding position, a multiplicity of sensors are required to be provided in a wide range, thus resulting in a high cost.
Also, as a method for detecting a wide-ranging pressure by one sensor, as disclosed in the Unexamined Japanese Patent Application Publication No. Hei 10-029495 and No. 2000-062565, etc., there is suggested a method in which a bladder having fluid sealed therein is provided inside a seat and a pressure sensor detects a pressure increase inside the bladder caused by the passenger weight. However, this method has a problem that, since the sensor cannot attain its function when the preload inside the bladder is deflated, a sealing structure for maintaining the preload is required and it is difficult to make this structure durable, still allowing no moderate-price production.
SUMMARY OF THE INVENTION
The invention has been-made to solve the aforesaid problems and an object thereof is to obtain a passenger detection apparatus which can cover a wide range in a simple construction.
The passenger detection apparatus according to the invention includes force transmission thread which is subjected to a tensile force by a power point arranged on a place, such as a seat, a floor surface, a wall surface or the like, which may possibly be displaced through contact with a passenger, a means for tensioning the force transmission thread, and a means for detecting the displacement of the force transmission thread.


REFERENCES:
patent: 3749866 (1973-07-01), Tiazkun et al.
patent: 3932718 (1976-01-01), Porat
patent: 4118691 (1978-10-01), Sims
patent: 4829287 (1989-05-01), Kerr et al.
patent: 4965446 (1990-10-01), Vyse
patent: 4978846 (1990-12-01), Buote
patent: 5021648 (1991-06-01), Jones
patent: 5164709 (1992-11-01), Lamberty et al.
patent: 5413378 (1995-05-01), Steffens et al.
patent: 5573269 (1996-11-01), Gentry et al.
patent: 5739757 (1998-04-01), Gioutsos
patent: 5763874 (1998-06-01), Luciano et al.
patent: 5865463 (1999-02-01), Gagnon et al.
patent: 6053045 (2000-04-01), Nakamura
patent: 6108842 (2000-08-01), Severinski et al.
patent: 6161439 (2000-12-01), Stanley
patent: 6161891 (2000-12-01), Blakesley
patent: 6169479 (2001-01-01), Boran et al.
patent: 6253133 (2001-06-01), Sakai et al.
patent: 6345839 (2002-02-01), Kuboki et al.
patent: 6348663 (2002-02-01), Schoos et al.
patent: 6356200 (2002-03-01), Hamada et al.
patent: 6556137 (2003-04-01), Oka et al.
patent: 2571842 (1984-10-01), None
patent: 2160266 (1985-12-01), None
patent: 2160266 (1985-12-01), None
patent: 5-139233 (1993-06-01), None

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