Measurement apparatus for measuring physical quantity such as fluid flow
AssigneesHitachi, Ltd., Hitachi Car Engineering Co., Ltd.
InventorsIzumi Watanabe, Naoki Saito, Masayuki Kozawa, Keiichi Nakada, Kei Ueyama
Life of this patent
Estimating the term…
Abstract
Resin members, on the surfaces of which metal films are formed, are used for; an auxiliary air passage provided in a main air passage, in which a sensor element of a physical quantity sensor such as an air flow sensor, an intake-air temperature sensor, etc., is situated; a housing; and so forth; in order to decrease both the thermal conductivity and the emissivity of those components to respective small values, whereby the temperature increase of the sensor due to both the heat conduction and the heat radiation can be suppressed.
Claims30
A flow detection element comprising:
- a resistor formed on a surface of a substrate which generates heat by current flowing in said resistor;
- a glass layer covering said resistor;
- a metal film formed on one of said glass layer and another surface of said substrate.
A flow-measurement apparatus comprising:
- a housing containing an auxiliary gas passage through which a part of gas flowing in a main gas passage, whose wall is made of resin, passes;
- a sensor element situated in said auxiliary passage;
- and
- a metal thin film formed on the inside surface of said wall of said main gas passage.
A flow-measurement apparatus comprising:
- a housing containing an auxiliary gas passage through which a part of gas flowing in a main gas passage passes;
- a sensor element situated in said auxiliary passage;
- and
- plates situated on outer surfaces of said housing via respective gaps.
A flow-measurement apparatus comprising:
- a housing containing an auxiliary gas passage through which a part of gas flowing in a main gas passage;
- a sensor element situated in said auxiliary passage;
- and
- resin skirts situated at both sides of said housing via respective gaps, said sides being in parallel with the axis of said main gas passage.
A flow-measurement apparatus comprising:
- a housing containing an auxiliary gas passage through which a part of gas flowing in a main gas passage passes;
- a sensor element situated in said auxiliary passage;
- and
- metal thin films formed on surfaces of said housing.
A physical quantity-detecting apparatus for an engine, said apparatus comprising:
- a resin housing having a gas introducing portion which is opened to a main gas passage;
- a detector element for detecting a physical quantity of gas passing through said gas introducing portion;
- and
- metal thin films covering said housing.
A physical quantity-detecting apparatus for an engine, said apparatus comprising:
- a resin housing having a gas introducing portion which is opened to a main gas passage;
- a detector element for detecting a physical quantity of gas passing through said gas introducing portion;
- and
- metal thin films formed on surfaces of said housing;
- wherein the emissivity of said thin films is smaller than that of members composing said housing.
Dependencies are inferred from the claim text.