Nippondenso Co., Ltd.

Nippon Soken, Inc.

Iwao Yokomori

Osamu Ina

Hiroshi Okada

Yukihiro Kato

Hiromi Ariyoshi

Osamu Ito

Yasuyuki Kawabe

Yoshifumi Watanabe

Toru Kosuda

Disclosed in an intake pipe pressure detecting device for detecting the pressure in that section of an intake pipe in an internal combustion engine which is on the downstream side of a throttle valve provided in the intake manifold. The pressure detecting device comprises a mixing chamber which has an opening in the wall of the intake pipe, a pressure introducing path which opens onto this mixing chamber, and air inlets adapted to allow fresh air to enter the mixing chamber, thereby generating an air flow directed from the mixing chamber to the intake pipe.

Intake pipe pressure detecting device

A semiconductor pressure transducer comprises a metal housing having a cylindrical recess to which an inlet passage of a medium to be measured is opened, a glass base being received in the recess and having a large diameter cylindrical portion and a small diameter cylindrical portion integrally connected to the large diameter cylindrical portion, a rubber O-ring interposed between a bottom of the recess and the base, a metal tubular collar disposed in the recess around the base to come into contact with the bottom of the recess, the collar urged by a caulked portion of the housing to press the base, a sensor chip provided on an end of the small diameter cylinder of the base for generating an electric signal in response to pressure of said medium, an annular clearance provided between the collar and the base, and an introducing passage provided in the base for introducing the medium from the inlet passage to the sensor chip.

Semiconductor pressure transducer

For controlling a pulse-operated electromagnetic valve, an energization voltage is applied to the actuating coil of the valve in response to a leading edge of the pulse to initiate an energization current. When the current reaches a predetermined peak value the voltage is decoupled from the coil to allow a circulating current to flow through a first path to decrease it at a higher rate. The circulating current is switched to a second path when it reaches a medium current value to decrease it at a lower rate. When the decreasing circulating current reaches a lower holding current value which is necessary to hold the valve operated, the voltage is coupled again to the coil to reinitiate the energization current, and when it reaches a higher holding current value lower than the medium current value the voltage is decoupled to reinitiate the circulating current. The higher and lower holding current values are successively detected to energize the coil with a current which is an average value of the higher and lower current values.

Current control method and apparatus for electromagnetic valves

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Kariya, Japan

Iwao Yokomori