Mitsubishi Denki Kabushiki Kaisha

Other

Japan Audatex Co., Ltd.

Susumu Nagano

Tateki Mitani

Kazuhiro Watanabe

Mitsuhiro Ono

Katsuaki Yasui

Toru Araki

Seiki Kodama

Akira Koshimizu

Yoshinori Yasuda

Tomoaki Makino

Seiichi Iruya

Martin Oakes

A dielectric constant sensing device of the present invention comprises a transmission line consisting of a first electrode formed of a conductor being wound like a longitudinal cylinder, a second electrode provided to be separated from the cylindrical surface of the first electrode at a predetermined distance, and a chamber for introducing a measured fluid between the first electrode and the second electrode, whereby a dielectric constant of the measured fluid can be sensed based on a rate of a pulse voltage wave propagated over the transmission line. Accordingly, the fluid dielectric constant sensing device which is able to attain high precision by a simple structure can be provided.

Fluid dielectric constant sensing device and method employing the same

An evaporative fuel leak diagnosing apparatus for an internal combustion engine, which can detect a pressure of concern with high accuracy with a structure implemented inexpensively while ensuring high accuracy for the detection of fuel vapor. The apparatus includes a computer unit (,A) for fetching directly non-linear outputs of a pressure sensor (,A), determining a pressure detection value within a furl tank (,) on the basis of the non-linear output value of the pressure sensor (,A) and data registered previously on the basis of the non-linear output value of the pressure sensor (,A) as fetched from the computer unit for use in evaluating the actual pressure corresponding to a noted pressure sensor value.

Evaporative fuel leak diagnosing apparatus

To obtain a pressure detection apparatus capable of changing output characteristics in a large area and changing a received pressure range without largely changing the apparatus in design. The apparatus comprises a pressure sensor including a pressure detection element having a bridge circuit to which a gauge resistor formed around a diaphragm portion formed by decreasing a part of the element in thickness is connected and an amplification circuit body serving as an amplification circuit except for an adjustment resistor, the pressure sensor being airtightly accommodated in a package having a pressure supply portion for supplying a pressure to be measured to the diaphragm portion, and a lead portion being disposed in the pressure sensor; an adjustment resistor part constituting the amplification circuit of the bridge circuit together with the amplification circuit body; a circuit substrate which is mounted by soldering to expose the pressure sensor and the adjustment resistor part and has a terminal portion for leading out an output from the amplification circuit; and a sensor accommodation vessel for accommodating an assembly constituted by the pressure sensor, the adjustment resistor part, and the circuit substrate therein.

Pressure detection apparatus

A pressure sensor into which the internal pressure of a fuel tank is introduced through a nipple portion and the atmospheric pressure is introduced through an atmosphere introducing hole, and a pressure difference between the internal pressure and the atmospheric pressure is detected by a diaphragm, comprises a check valve provided in the nipple portion to prevent fuel from leaking out to the atmospheric side. A pressure buffer chamber in the nipple portion of the pressure sensor is provided in which a ball is installed. A bottom face of the pressure buffer chamber is formed to be concave, and a receiving seat for receiving the ball is provided on the bottom face. Therefore, no fuel leaks outside, even when the vehicle comes across an accident and overturns sideways under the condition that the diaphragm used as a sensor element is fractured in the measurement of internal pressure of the fuel tank.

Pressure sensor which prevents leakage of fuel

A pressure difference detector for detecting a pressure difference between atmospheric pressure and a fuel system vapor pressure to be measured, includes a pressure dampening member 17a for dampening the flow of atmospheric air between an introducing inlet 11a and a reference pressure chamber 12 to limit the air flow rate to a value smaller than a leakage flow rate between the chamber and a fuel system vapor pressure introducing inlet 11b due to a leaking 0 ring seal. This prevents an erroneous judgment that the fuel system is leaking.

Pressure difference detector, a method for judging an abnormality of the

A pressure sensor comprising a passage for introducing a pressurized medium; a member surrounding the passage; first and second sealants disposed between the member and the passage for preventing the pressurized medium from leaking to the outside through a clearance between the member and the passage; and a pressure sensing element communicating with the passage; the first sealant being made of a first material which is difficult to be deformed by the pressurized medium; the second sealant being made of a second material having a sealing effect against temperature change; the first and second sealants being arranged in series between the passage and the member surrounding the passage.

Pressure sensor having multiple O-ring sealants provided in series and a

An automobile repair estimate issuing device having a part data file made up of a first file for storing part data other than name data and a second file for storing the name data. The data file is stored in a memory having a reduced memory capacity. Input and output devices, a central processing device, the memory and a printing devices are reduced in size and weight thereby to provide a portable type automobile repair estimate issuing device which can issue a repair estimate at an automobile repairing place on the spot.

Growing community of inventors

Hyogo, Japan

Susumu Nagano