Nippon Soken, Inc.

Denso Corporation

Nippondenso Co., Ltd.

Minoru Ohta

Tadashi Hattori

Eturo Yasuda

Kazuhiko Miura

Seizi Huzino

Michitoshi Onoda

Kenji Kanehara

Yoshihiro Segawa

Isao Watanabe

Masahiro Hamaya

Tomio Kawakami

Yutaka Hattori

Makoto Hori

Masanori Fukutani

Nobuyuki Tsuji

Naoto Miwa

Toshiki Saburi

Mitsuru Asano

Yasuhiro Mizutani

Kenji Fukaya

Hirokatsu Mukai

Tetsuya Kato

Hiroaki Yamaguchi

Minoru Nishida

Ken Yamamoto

Yoshiyuki Yamauchi

Takashi Kojima

Toshihiro Sakawa

Michihiro Yamakawa

Toshimi Miyamoto

Yukio Iwasaki

Hiroyuki Tatebayashi

Michitosi Onoda

Shigenori Isomura

Hiromi Sano

Makoto Shirai

Hirokazu Yamada

Toshiya Nagasawa

Nobuyoshi Sakakibara

Makoto Nakae

Masahiro Shibata

Hirotane Ikeda

Toshihiro Suzumura

Masaya Fujimoto

Shinichi Mukainakano

Osamu Kobayashi

Naochika Nunogaki

Tatsunori Kato

Mitutaka Katada

Takayuki Tominaga

Masami Oki

Yoichi Kotanshi

Akihiro Oka

Kazuo Hayashi

Koji Shiozawa

Masato Yamamoto

A tube for a heat exchanger has notch portions at a longitudinal direction end portion to be inserted into a header tank. Further, several passage holes are provided in the tube to extend in a longitudinal direction of the tube in which refrigerant flows. The notch portions are formed by cutting parts of the tube to be defined by cut surfaces. The passage holes are not provided at portions corresponding to the cut surfaces. Therefore, the passage holes are securely prevented from being crushed and cut when the notch portions are formed by cutting. As a result, joining failure between the tube and the header tank can be prevented.

Heat exchanger having multi-hole structured tube

Air fuel ratio sensor

In a decompression device-integrated heat exchanger, a pressure-reducing unit for reducing high-pressure refrigerant of a refrigerant cycle, and an inner heat-exchanging unit for performing heat-exchange between high-pressure refrigerant before being decompressed in the pressure-reducing unit and low-pressure refrigerant after being decompressed in the pressure reducing unit are integrated to each other. The inner heat-exchanging unit has a high-pressure tube through which high-pressure refrigerant flows, and a low-pressure tube through which low-pressure refrigerant flows. Both the tubes are wound around a case of the pressure-reducing unit, and are brazed to the case on contacting portions therebetween. Further, in each tube, wall thickness of the contacting portion is made thinner than that of the other portion. Thus, the decompression device-integrated heat exchanger has a reduced weight, while having a simple structure.

Decompression device-integrated heat exchanger for refrigerant cycle

An air fuel ratio sensor for use in an exhaust gas purification system for an internal combustion engine. The sensor has an outer and inner cover,and,for protection of lead wires,and,to a detecting element,and a heater of the sensor, a rubber seal,for obtaining a seal between the covers and the lead wires and a water repellent filter,for obtaining a seal between the inner and outer covers,and,, while keeping an air ventilation capability of the space inside the covers. For receiving the lead wires,and,, the seal,is formed with holes,such that the minimum thickness between the hole and an outer surface of the seal is 1 mm or more. A crimping of the outer cover,is done so that a deformation of the seal,in a range between 10 to 20% of the outer diameter is obtained. A crimping of the outer cover,is further done at a first section,A at a larger force for fixation of the outer cover,to the inner cover,and at a second section,B at a smaller force for holding the water repellent filter,between the outer and inner covers. In the crimping, the crimping at the first section is completed simultaneously with or earlier than the completion of the crimping at the second section.

Air fuel ratio sensor and method for assembling the same

An air-fuel ratio sensor of a limit current type is used for an air-fuel ratio feedback control. When the air-fuel ratio sensor is in a semi-activated state, the air-fuel ratio sensor is driven into an electromotive force generating mode by a current externally applied thereto thereby to shift an electromotive force changing point so that an air-fuel ratio at which the electromotive force changes stepwisely is shifted from the stoichiometric ratio point to a lean zone. When the air-fuel ratio sensor is in a completely activated state, the air-fuel ratio sensor is applied with a voltage to produce a limit current varying with an air-fuel ratio so that a feedback control is performed based on the advanced control theory by using a linear current output characteristics.

Air fuel ratio control apparatus having air-fuel ratio control point

An oxygen concentration sensor having excellent sealing performance between a lead wire and a lead wire insertion hole includes a sensor element disposed insertedly into a housing, protective covers disposed at an end portion of the housing, lead wires inserted into the protective covers, and an elastic insulating member disposed inside the protective covers and having a lead wire insertion hole for inserting the lead wires. The lead wire insertion hole in the elastic insulating member has a rib protruding in the radial direction. The elastic insulating member is caulked and fixed by the protective covers.

Oxygen concentration sensor

A plurality of hologram elements are simultaneously exposed to a constructing light while they are arranged in the form of a stack, so that the incident beam can be uniform within the exposure area. The plurality of hologram elements should be transparent to the constructing light.

Process for making holograms and holography device

Air fuel ratio sensor for use in an exhaust gas purification system for an internal combustion engine. The sensor has an outer and inner cover 12 and 13 for protection of lead wires 16, 18 and 19 to a detecting element 3 and a heater 5 of the sensor, a rubber seal for 2 for obtaining a sealing between the covers and the lead wires and a water repellent filter 36 for obtaining a seal between the inner and outer covers 12 and 13, while keeping an air ventilation capability of the space inside the covers. For receiving the lead wires 16, 18 and 19, the seal 2 is formed with holes 20such that the minimum thickness between the holes and the minimum thickness between the hole and an outer surface of the seal is 1 mm or more. A crimping of the outer cover 12 is done so that a deformation of the seal 2 in a range between 10 to 20% of the outer diameter is obtained. A crimping of the outer cover 12 is further done at a first section 12A at a larger force for fixation of the outer cover 12 to the inner cover 12 and at a second section 12B at a smaller force for holding the water repellent filter 36 between the outer and inner covers. In the crimping, the crimping at the first section is completed simultaneously or earlier from the completion of the crimping at the second section.

An air fuel ratio sensor has a sensor element having a sensing portion and a flange portion in contact with a tapered portion of an accommodation hole of a housing. The sensor element is hot crimped at a hot crimping portion of a housing. At least the hot crimping portion is made of a ferritic stainless steel formed by cold forging and having a composition content comprising a total amount of C and N impurities of 0.03 wt % or below. The average hot crimping temperature of the housing is performed at lower than 1000.degree. C. as applied for a time period of one second or less.

Air fuel ratio sensor and a method for making the same

An oxygen concentration detector has a detecting element comprising a solid electrolyte inserted into a housing and heating means for heating the detecting element, and the outer surface of the detecting element is provided with a surface layer, the contact angle of the surface layer being larger than the contact angle of the outer surface of the detecting element with which the surface layer directly contacts.

Oxygen concentration detector

An air-fuel ratio sensor comprises an oxygen concentration sensing element, a housing for holding this oxygen concentration sensing element, and protecting covers with gas holes. The protecting covers comprises an inside cover disposed closely to the oxygen concentration sensing element, and an outside cover surrounding the outside cover. Flange-like peripheral portions, formed on the protecting covers, are fixed to the abutting face of the housing by a caulking operation. These flange-like peripheral portions are disposed alternately along a same closed curve around the oxygen concentration sensing element, so that they are not overlapped with each other.

Air-fuel ratio sensor

A hologram includes an optically transparent base plate having first and second opposite surfaces. A hologram element is provided on the first surface of the base plate, and has a predetermined holographic pattern. An optically transparent member has first and second opposite surfaces. The first surface of the member faces the hologram element. An arrangement serves to prevent light, which successively passes through the transparent base plate, the hologram element, and the member and is then reflected at a boundary between the second surface of the member and an atmosphere, from travelling back to the hologram element.

Hologram

An exhaust purification device includes a catalytic converter for purifying exhaust gas from an engine, air-fuel ratio sensors provided on the upstream side and downstream side of the catalytic converter, respectively, for detecting the concentration of a specific component in the exhaust gas, a control device for processing the output of the air-fuel ratio sensors and generating a signal based on the processed output, and a catalyst degradation warning device which operates according to the signal generated by the control device for warning an operator of a degraded catalyst, where the responsiveness of the downstream side air-fuel ratio sensor is lower than the responsiveness of the upstream side air-fuel ratio sensor.

Catalyst degradation detecting apparatus

The present invention pertains to a method for producing a mixture including an injected engine fuel from an injector, a combustion engine intake-air and an evaporative gas from the engine fuel. The method includes the steps of measuring a characteristic of the evaporative gas and changing step for changing a mixing ratio of the evaporative gas to at least one of the injected engine fuel and the combustion engine intake-air, according to the measured characteristic of the evaporative gas, by changing a flow rate of the combustion engine intake-air.

Method for producing fuel/air mixture for combustion engine

Growing community of inventors

Okazaki, Japan

Minoru Ohta