Title:
AIR FLOWMETER
Document Type and Number:
Japanese Patent JP3383237
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an air flowmeter of a plate type heating resistor type for improving forward and reverse flow sensing accuracies at a pulsation flow by reducing an output noise.
SOLUTION: A heating resistor type bidirectional sensing type air flow measuring element (plate-type element) 5 for detecting a forward and reverse flow pulsation air flows at a sub-passage 2 disposed in a suction passage 1 of an internal combustion engine is held in a holding member 6a. The sub-passage 2 is formed in a passage shape in which both forward and reverse air flows are brought into contact with the element 5 in an oblique direction. Thus, the passage scarcely affected by an influence of a turbulent flow is constituted without introducing an increase in a cost by altering only a shape and a structure of the sub-passage itself disposed in the suction passage of the engine, and forward and reverse pulsation flows can be accurately detected.
Inventors:
Hiroshi Onikawa
Shinya Igarashi
Izumi Watanabe
Keiichi Nakata
Shinya Igarashi
Izumi Watanabe
Keiichi Nakata
Application Number:
JP11953399A
Publication Date:
March 04, 2003
Filing Date:
April 27, 1999
Export Citation:
Assignee:
株式会社日立製作所
株式会社日立カーエンジニアリング
株式会社日立カーエンジニアリング
International Classes:
G01F1/00; F02D35/00; G01F1/68; G01F1/684; G01F1/69; G01P5/12; G01P13/02; (IPC1-7): G01F1/68; F02D35/00; G01F1/00; G01P5/12; G01P13/02
Domestic Patent References:
| JP10148555A | ||||
| JP59206715A |
Attorney, Agent or Firm:
Katsuo Ogawa (2 outside)
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