Hitachi, Ltd.

Hitachi Car Engineering Co., Ltd.

Hitachi Automotive Systems, Ltd.

Mann+hummel Gmbh

Hiromu Kikawa

Shinya Igarashi

Masayuki Kozawa

Izumi Watanabe

Keiichi Nakada

Naoki Saito

Kei Ueyama

Takayuki Saito

Keiji Hanzawa

Akio Yasukawa

Akira Takasago

Takayuki Yogo

Nobuhito Hiramatsu

Takayuki Saitou

Masamichi Yamada

Takeshi Morino

Robert Hasenfratz

Junichi Horie

Yukio Kato

Hiroyuki Abe

Yuki Okamoto

Hitoshi Ishikawa

Eric Thebault

Naoki Saitou

Isao Okazaki

Jürgen Lang

Akira c/o Hitachi Ltd Int Prop Group Takasago

An arrangement of a mass intake air flow measurement device suitable for integrating a humidity sensing device as well as a temperature sensing device and a pressure sensing device is provided. A second bypass passagebypassing a bypass passageis formed and a humidity sensing deviceis mounted in the second bypass passage. A second bypass passage inletand a second bypass passage outletformed in a wall surface of the bypass passageare opened parallel to the direction of flow of air flowing in the bypass passage

Mass air flow measurement device

Physical amount sensor for air

Portion of physical amount sensor for air

An arrangement of a mass intake air flow measurement device suitable for integrating a humidity sensing device as well as a temperature sensing device and a pressure sensing device is provided. A second bypass passage bypassing a bypass passage is formed and a humidity sensing device is mounted in the second bypass passage. A second bypass passage inlet and a second bypass passage outlet formed in a wall surface of the bypass passage are opened parallel to the direction of flow of air flowing in the bypass passage.

An air flow measuring instrument, comprising: an auxiliary passagearranged inside a main passage through which fluid flows, a tabular memberon which a pattern of a heating resistor for measuring an air flow is provided on one face, the tabular member being disposed inside the auxiliary passage so that the one faceon which the heating resistor pattern of the tabular member is provided is disposed along a flow of fluid inside the auxiliary passage, a heating resistor pattern-side fluid passageportion formed so that the fluid flows between the faceand a passage-forming surfaceof the auxiliary passage, and a back-surfaceside fluid passage portion formed so that fluid flows between a faceon a side opposite to the face of the tabular member and the passage-forming surface of the auxiliary passage. Guidance portionguiding dust that collides against the end portion to back-surface side fluid passage portionside is provided on upstream-side end of tabular member.

Air flow measuring instrument having dust particle diverting structure

For arranging an air mass meter at a flow channel, the flow channel has a housing section with a flange surrounding a receiving opening for the air mass meter. The air mass meter has a socket with a contact surface that is facing the flange. Fasteners are provided that attach the socket on the housing section. The socket and the housing section have elements for positioning the air mass meter free of play relative to a flow direction of a fluid flow that is guided in the flow channel.

Arrangement of an air mass meter at a flow channel

The present invention provides an air flow measuring device comprising a housing with a sub-passage having a inlet and a outlet for air flow formed in the housing, the sub-passage further having a predefined curvature with a maximum downstream point and a flow measuring element located in the sub-passage at a position at least further downstream from the point.

Air flow measuring device provided with a vent in air passage

A heating resistor type flow measuring device comprising a housing having a support part provided between a frame body and a connector and connected to the mounting part of a fluid passage, a flow rate detection element held on the frame body side of the housing, and an electronic circuit held on the housing and connected electrically to the flow rate detection element and the connector, wherein the electronic circuit is held on the frame body side of the housing and positioned in the fluid passage, a member with the rigidity higher than the material of the main structural member of the housing is formed integrally with the support part, the housing is fixed to the fluid passage through the member with high rigidity. A metal plate is inserted into the support part so as to increase rigidity. Further, a distance is provided between the support part and a metal plate forming a route for conducting the heat transferred to the metal base fixing an electronic circuit substrate by a plastic mold so as to form a structure obstructing a heat transfer, or a clearance is provided in a portion spaced by the plastic mold between the support part and the metal base so as to form a structure obstructing a heat transfer.

Heating resistor type flow measuring device housing structure having projection and recess for preventing mis-installation

A thermal type air flow measuring instrument has a molded part formed by integral molding with a metal plate. A slot or opening allowing only a resin to pass through the same is formed in the metal plate in an area subjected to higher stresses. A part of the connector terminals are disposed in the vicinity of an area where the resin has a larger thickness and the temperature difference between the inside and the outside of the resin is locally increased. The injecting direction is set to prevent a weld line and a void from being generated. For the molded part with the metal plate inserted therein, the occurrence of cracks is minimized. Further, an increase of the fatigue crack growth rate is decreased.

Thermal type flow measuring instrument with mold casing in metal insert

Air flow measuring device and engine having the air flow measuring device

Air flow measuring device

An air temperature detectoris disposed close to an auxiliary passage sidewall, which has an auxiliary passage wall holeformed near the air temperature detector. A heat-sensitive resistoris also disposed close to the auxiliary passage sidewall, which has an auxiliary passage wall holeformed near the heat-sensitive resistor. Further, a resistor heateris disposed close to an auxiliary passage sidewall, which has an auxiliary passage wall holenear the resistor heater

Flowmeter with resistor heater

Heating resistor type flow measuring device

The present invention provides an air flow measuring device comprising a housing with a sub-passage having an inlet and an outlet for air flow formed in the housing, the sub-passage further having a predefined curvature with a maximum downstream point and a flow measuring element located in the sub-passage at a position at least further downstream from the point.

Growing community of inventors

Hitachinaka, Japan

Hiromu Kikawa