EP0023970A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Air flow meter
Assignee: Hitachi Ltd
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Filing: 1980-07-03
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Granted: —
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Expires: 2000-07-03
Abstract
Abstract The air flow meter (50) comprises an air velocity measuring resister (501) and a temperature compensating resistor (503) and is installed in a bypass passage (30) provided at an intake passage (12) running through an air horn (10). The air velocity measuring resistor (501) and the temperature compensating resistor (503) are supported by lead wires (302, 304) whose portions exposed in the bypass passage (30) are the same in length. A cover (308) forming the bypass passage (30) is made of heat insulating synthetic resin material to prevent heats from being transmitted to the resistors (501, 503).
Inventors
- 👤 Yutaka Nishimura
- 👤 Hiroshi Kuroiwa
- 👤 Tadashi Kirisawa
- 👤 Yoshishige Oyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 22:11
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/68; G01F1/684; G01F1/6842; G01F1/696; G01F1/698; G01F5/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
60 words
1 . Air flow meter comprises an air velocity measuring resistor and a temperature compensating resistor and is installed in an air flow passage through lead wires exposed therein and supporting the resistors, the temperature compensating resistor being supported by the lead wires having no less heat resistance than that of the lead wires supporting the air velocity measuring resistor.
Claim 2
Dependent Claim
60 words
1 . Air flow meter comprises an air velocity measuring resistor and a temperature compensating resistor and is installed in an air flow passage through lead wires exposed therein and supporting the resistors, the temperature compensating resistor being supported by the lead wires having no less heat resistance than that of the lead wires supporting the air velocity measuring resistor.
Claim 3
Dependent Claim
30 words
Air flow meter as set forth in claim 1 , wherein the lead wires supporting said temperature compensating resistor are longer than that supporting said air velocity measuring resistor .
Claim 4
Dependent Claim
31 words
Air flow meter as set forth in claim 1, wherein the lead wires supporting said temperature compensating resistor are the same in length as that supporting said air velocity measuring resistor.
Claim 5
Dependent Claim
35 words
Air flow meter as set forth in claim 1, 2 or 3, wherein the lead wires supporting said temperature compensating resistor are smaller in diameter thereof than that supporting said air velocity measuring resistor .
Claim 6
Dependent Claim
38 words
5 . Air flow meter as set forth in claim 1 , 2 or 3, wherein the lead wires supporting said temperature compensating resistor are the same in diameter thereof as that supporting said air velocity measuring resistor.
Claim 7
Dependent Claim
41 words
Air flow meter as set forth in claim 1 , 2 or 3, wherein said air velocity measuring resistor and said temperature compensating resistor are installed in a bypass passage provided at an intake passage running through an air horn .
Claim 8
Dependent Claim
38 words
7 . Air flow meter as set forth in claim 1, wherein said air velocity measuring resistor is arranged above said temperature compensating resistor in a bypass passage provided at an intake passage running through an air horn.
Claim 9
Dependent Claim
39 words
Air flow meter as set forth in claim 1, wherein said air velocity measuring resistor and said temperature compensating resistor are arranged side by side in a bypass passage provided at an intake passage running through an air horn.
Claim 10
Dependent Claim
36 words
Air flow meter as set forth in claim 6, wherein the bypass passage has a rectangular cross section with a longer lateral side, and is formed by a member made of heat insulating synthetic resin material.
Claim 11
Dependent Claim
62 words
Air flow meter as set forth in claim 1, wherein said air velocity measuring resistor and said temperature compensating resistor are connected through the lead wires to a control circuit in which a suitably adjusted constant voltage is added to the potential difference between two intermediate points of a bridge circuit incorporating said air velocity measuring resistor and said temperature compensating resistor.
References Cited (Backward Citations)
No citation records indexed.
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