Air flow rate measuring device for an internal combustion engine
AssigneesHitachi, Ltd., Hitachi Car Engineering Co., Ltd.
InventorsTakashi Kadohiro, Tadao Suzuki, Mamoru Tsumagari, Shinya Igarashi
Life of this patent
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Abstract
An air flow rate measuring device for an internal combustion engine is disclosed. The air flow rate measuring device has a casing provided downstream from an air cleaner element for purifying intake air to the internal combustion engine, a duct connected fluidly to and downstream from the casing, and an air flow meter provided in said duct, for measuring an air flow rate taken into the internal combustion engine. A cross-sectional area of a connection portion between the casing and the duct, taken perpendicularly to the direction of air flow is the minimum cross-sectional area in the duct.
Claims13
An air flow rate measuring device for an internal combustion engine comprising:
- an air flow meter module in which an air flow rate detector and a driving circuit are integrated, the air flow rate detector detecting an air flow rate taken into the internal combustion engine and the driving circuit being connected to said air flow rate detector for outputting an signal corresponding to the measured air flow rate,
- an air flow meter body which constitutes an intake air passage for the internal combustion engine, said air flow meter module being mounted in said body such that the air flow rate detector can be arranged in the intake air passage,
- wherein said air flow meter body comprises a casing of which one end is connected fluidly to an air cleaner element, and a duct with a module mounting member connected to the other end of the casing, and
- wherein a flow cross-sectional area of a connection portion between the casing and the duct completely upstream of the air flow meter module, taken perpendicularly to the direction of air flow, is the minimum cross-sectional area in the duct.
An air flow rate measuring device for an internal combustion engine comprising:
- an air flow meter module in which an air flow rate detector and a driving circuit are integrated, the air flow rate detector detecting an air flow rate taken into the internal combustion engine and the driving circuit being connected to said air flow rate detector can be arranged in the intake air passage,
- wherein said air flow meter body comprises a casing of which one end is connected fluidly to an air cleaner element, and a duct with a module mounting member connected to the other end of the casing, the duct being formed integrally with the casing, and
- wherein a flow cross-sectional area of a connection portion between the casing and the duct completely upstream of the air flow meter module, taken perpendicularly to the direction of air flows is the minimum cross-sectional area in the duct.
An air flow rate measuring device for an internal combustion engine comprising;
- a casing,
- a duct connected fluidly to and downstream from said casing, and
- an air flow meter provided in said duct for measuring an air flow rate taken into the internal combustion engine,
- wherein a flow cross-sectional area of a connection portion between said casing and said duct completely upstream of the air flow meter, taken perpendicularly to the direction of air flow, is the minimum cross-sectional area in said duct.
An air cleaner having an air flow rate measuring device for an internal combustion engine comprising:
- a casing provided downstream from an air cleaner element for purifying intake air to the internal combustion engine,
- a duct connected fluidly to and downstream from said casing, and
- an air flow meter provided in said duct, for measuring an air flow rate taken into the internal combustion engine, a flow cross-sectional area of a connection portion between said casing and said duct completely upstream of the air flow meter, taken perpendicularly to the direction of air flow being the minimum cross-sectional area in said duct.
Dependencies are inferred from the claim text.