Mass air flow measurement device
AssigneeHitachi Automotive Systems, Ltd.
InventorsTakayuki Saito, Takayuki Yogo, Shinya Igarashi, Hiromu Kikawa
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Abstract
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 501 bypassing a bypass passage 205 is formed and a humidity sensing device 500 is mounted in the second bypass passage 501. A second bypass passage inlet 502 and a second bypass passage outlet 503 formed in a wall surface of the bypass passage 205 are opened parallel to the direction of flow of air flowing in the bypass passage 205.
Claims1
A measurement device comprising:
- a mass air flow measuring device for measuring a mass intake air flow in an air intake tube;
- a humidity sensing device for sensing humidity in the air intake tube;
- and
- a bypass passage into which part of air in the air intake tube flows;
- wherein,
- the bypass passage divides into two channels;
- the air flow measurement device is arranged in one of said channels;
- the humidity sensing device is arranged in the other of said channel;
- the one channel and the other channel merge downstream of the air flow measurement device and the humidity sensing device;
- and
- the bypass passage includes a passage with a reduced sectional area being positioned between the dividing portion of the bypass passage and the merging portion of the bypass passage.
Dependencies are inferred from the claim text.