EP0248535A2
Expired / Lapsed
EP
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System for measuring the quantity of intake air in an engine
Assignee: Subaru Corp
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Filing: 1987-05-05
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Granted: —
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Expires: 2007-05-05
Abstract
Abstract A system for measuring quantity of intake air in an engine has an airflow meter provided in an intake passage upstream of a throttle valve for measuring the quantity of intake air. Quantity of intake air entered into a space between the throttle valve and cylinders of the engine without entering into the cylinders is calculated. The difference between the quantity of intake air measured by the airflow meter and the quantity entered in the space is calculated to provide the quantity of intake air actually entering into the cylinders.
Inventors
- 👤 Yoshiyuki Sogawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 14:31
CPC Classifications
G; G01; G01F; G01F15/00; G01F15/02; G01F15/04; F; F02; F02D; F02D41/00; F02D41/02; F02D41/18; F02D41/182
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
148 words
A system for measuring the quantity of intake air in an engine for a motor vehicle, the engine (1) having an intake passage (2), a throttle valve (4) located in the intake passage to divide the passage into a first intake passage upstream of the throttle valve and a second intake passage between the throttle valve and the cylinders of the engine; and an airflow meter (10) provided in the first intake passage for measuring a first quantity (Qa) of intake air flowing through the first intake passage; characterised in that there is provided first means (20, 24) for determining a second quantity (Qc) of intake air entering into the second intake passage without entering into the cylinders; and second means for producing a signal representing the quantity of intake air (Qe) actually entering into the cylinders being the difference between the first quantity and the second quantity.
Claim 2
Independent Claim
148 words
A system for measuring the quantity of intake air in an engine for a motor vehicle, the engine (1) having an intake passage (2), a throttle valve (4) located in the intake passage to divide the passage into a first intake passage upstream of the throttle valve and a second intake passage between the throttle valve and the cylinders of the engine; and an airflow meter (10) provided in the first intake passage for measuring a first quantity (Qa) of intake air flowing through the first intake passage; characterised in that there is provided first means (20, 24) for determining a second quantity (Qc) of intake air entering into the second intake passage without entering into the cylinders; and second means for producing a signal representing the quantity of intake air (Qe) actually entering into the cylinders being the difference between the first quantity and the second quantity.
Claim 3
Dependent Claim
35 words
The system according to claim 1, characterised in that the first means comprises third means for calculating pressure in the second intake passage, and fourth means for calculating the second quantity based on the pressure.
Claim 4
Dependent Claim
35 words
The system according to claim 2, characterised in that the third means calculates the pressure based on pressure in the first intake passage, the first quantity, and the degree of opening of the throttle valve.
References Cited (Backward Citations)
No citation records indexed.
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