JPS5497066A - Intake air flow meter for internal combustion engine - Google Patents
Intake air flow meter for internal combustion engineInfo
- Publication number
- JPS5497066A JPS5497066A JP401678A JP401678A JPS5497066A JP S5497066 A JPS5497066 A JP S5497066A JP 401678 A JP401678 A JP 401678A JP 401678 A JP401678 A JP 401678A JP S5497066 A JPS5497066 A JP S5497066A
- Authority
- JP
- Japan
- Prior art keywords
- combustion engine
- internal combustion
- vortexes
- air
- flow rate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE: To generate stable Karman's vortexes to make it possible to stably meter the flow rate over the whole running range of an internal combustion engine by absorbing the negative pressure surge by an expansion chamber in the case of a low intake manifold vacuum.
CONSTITUTION: The air from an intake air guide tube 1 generates at the wake of a column 3 the Karman's vortexes of the number corresponding to the flow rate and is guided through an expansion chamber 6 and a throttle valve 2 into the intake valve of the internal combustion engine. The ultrasonic waves from their oscillator 4 are mixed with the frequency corresponding to the number of the vortexes and then are received at 5 and subjected to signal processing at 5a so that the air flow rate is detected. In this instance, as the manifold vacuum becomes lower than about 50 mm Hg, the effective area of the throttle valve 2 is increased so that the pressure surge generated at the instant when the intake valve is opened reaches the expansion chamber 6 and is absorbed thereby so that no influence is exerted upon the flow of the air in the vicinity of the column 3.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP401678A JPS5497066A (en) | 1978-01-17 | 1978-01-17 | Intake air flow meter for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP401678A JPS5497066A (en) | 1978-01-17 | 1978-01-17 | Intake air flow meter for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5497066A true JPS5497066A (en) | 1979-07-31 |
Family
ID=11573163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP401678A Pending JPS5497066A (en) | 1978-01-17 | 1978-01-17 | Intake air flow meter for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5497066A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3713523A1 (en) * | 1986-04-24 | 1987-10-29 | Mitsubishi Electric Corp | AIR INLET MEASURING DEVICE FOR A COMBUSTION ENGINE |
| JP2012507709A (en) * | 2008-10-29 | 2012-03-29 | ローズマウント インコーポレイテッド | Vortex flowmeter body with grooves on the rear facing surface |
-
1978
- 1978-01-17 JP JP401678A patent/JPS5497066A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3713523A1 (en) * | 1986-04-24 | 1987-10-29 | Mitsubishi Electric Corp | AIR INLET MEASURING DEVICE FOR A COMBUSTION ENGINE |
| JP2012507709A (en) * | 2008-10-29 | 2012-03-29 | ローズマウント インコーポレイテッド | Vortex flowmeter body with grooves on the rear facing surface |
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