CN201600156U - Vehicle air flow sensor - Google Patents
Vehicle air flow sensor Download PDFInfo
- Publication number
- CN201600156U CN201600156U CN2010201208057U CN201020120805U CN201600156U CN 201600156 U CN201600156 U CN 201600156U CN 2010201208057 U CN2010201208057 U CN 2010201208057U CN 201020120805 U CN201020120805 U CN 201020120805U CN 201600156 U CN201600156 U CN 201600156U
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- flow
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- air flow
- cushion chamber
- retaining wall
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- 230000035945 sensitivity Effects 0.000 abstract description 6
- 230000000903 blocking effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 20
- 238000005259 measurement Methods 0.000 description 4
- 230000001464 adherent effect Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Abstract
The utility model relates to a vehicle air flow sensor, comprising a sensor main body, a measuring end on the sensor main body, wherein the measuring end is provided with an air flow inflowing passage, an air flow buffer cavity and an air flow out-flowing passage which are communicated with each other and the air inflowing passage is provided with an air flow affluxion passage and an air flow commutation passage and the air flow buffer cavity is provided with an air flow buffer cavity inlet; the passage from the air flow affluxion passage to the air flow commutation passage is in a gradual narrow way and the passage from the air flow commutation passage to the air flow buffer cavity inlet is in a gradual wide way; an air flow sensing element is arranged in the air flow buffer cavity corresponding with the air flow buffer cavity inlet and another side of air flow buffer cavity corresponding with the air flow buffer cavity inlet is provided with a blocking wall. The vehicle air flow sensor reasonably and effectively processes the problems that inverted air flow and non air input turbulent flow generated during air input of the vehicle engine and has better sensitivity and balance when measuring the air flow.
Description
Technical field
The utility model relates to a kind of automobile air flow sensor, relates to a kind of sensor of measuring the MAF that internal combustion engine of motor vehicle enters particularly.
Background technology
The automobile air flow sensor is to be used for the air mass flow of motor car engine is carried out electrical signal conversion and this information is offered the automobile central processing unit, and in the cylinder that guarantees engine correct air-fuel ratio to be arranged, therefore the degree of accuracy to it requires very high.The automobile air flow sensor generally includes a shell, sensor main body, and electrical connector, sensing circuit, air-flow sensitive element are arranged on the sensor main body, and sensor main body partly stretches in the shell and is installed on the shell.At present, known automobile air flow sensor market is by foreign technology and product monopolization, problems such as the inverted draft that existing associated production producer produces during to car engine air admittance, non-intake turbulance can not be handled rationally and effectively, and its product can cause problems such as motor car engine job insecurity, fuel consumption be excessive in actual use.
In the air flowmeter that adopts the measurement passage that takes the shape of the letter U at present, sensor is positioned at measures feeder connection one side.Because passage air flowing quality Q m is big more measuring, its output voltage V o is also big more, its fundamental relation
From then on relational expression as can be seen: when air velocity was low, it is high more that sensor is surveyed the sensitivity of flow; And when air velocity was higher, air mass flow was bigger, and the sensitivity of sensor detection fluctuations in discharge is relatively low.
It as the patent No. 200820137061.2 the disclosed air flowmeter of patent documentation, its technical scheme is: comprise a measuring junction, be provided with a gas flow in the side of this measuring junction, and in this gas flow, be provided with a sensor, described gas flow inwall shrinks the formation contraction section gradually to the downstream from the upstream, described sensor is positioned at this contraction section, the entrance section of gas flow is more than two times or two times of exit area, outlet and the both sides that enter the mouth and set up air flowmeter separately, and the two setting of staggering each other, gas flow between this outlet and inlet is curved, and other runners of this arc are positioned at the position near this outlet.Though this technical scheme slight change air-flow measurement sensitivity harmony, effect are not very desirable, and problems such as the inverted draft that produces during to car engine air admittance, non-intake turbulance still can not be handled rationally and effectively.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art, the utility model is proposed.The purpose of this utility model be to provide a kind of from the airflow channel structure optimal design, problems such as the inverted draft that produces in the time of handling car engine air admittance rationally and effectively, non-intake turbulance, and the harmonious better automobile air flow sensor of air-flow measurement sensitivity.
For reaching above-mentioned purpose, the disclosed automobile air flow sensor of the utility model, comprise sensor body, sensor body is provided with measuring junction, it is characterized in that: described measuring junction is provided with the air-flow flow channel, the air-flow cushion chamber, the air-flow flow pass, the air-flow flow channel, the air-flow cushion chamber, the air-flow flow pass is and is communicated with setting, the air-flow flow channel is provided with air-flow busway and air-flow rectification passage, the air-flow cushion chamber is provided with air-flow cushion chamber inlet, described air-flow busway to air-flow rectification passage is gradually narrow formula setting, air-flow rectification passage to air-flow cushion chamber inlet is gradually wide formula setting, place, corresponding air-flow cushion chamber entry position is provided with the air-flow sensitive element in the air-flow cushion chamber, and the corresponding air-flow cushion chamber inlet of air-flow cushion chamber opposite side is provided with retaining wall.So be provided with, when having charge air flow in the main channel, the part air-flow that might carry pulse pneumatic and non-intake turbulance secretly enters the air-flow flow channel, suppress non-intake turbulance and made in order level and smooth air-flow through air-flow busway, air-flow rectification passage by rectification, enter the air-flow cushion chamber and flow to the air-flow sensitive element through air-flow cushion chamber inlet straight, simultaneously because the space during from air-flow rectification channel transition to the air-flow cushion chamber becomes big suddenly, so produce some eddy current, eddy current can produce the afterflow effect to pulse pneumatic; The part air-flow forms air-flow stably through after the above-mentioned processing, and air-flow circling gas flow sensitive element flows through, and flows out from the air-flow flow pass at last, and sneaks into from the charge air flow of measuring junction by-pass flow; When the charge air flow amount hour, air-flow in the air-flow cushion chamber is produced the effect of outwards drawing from the charge air flow of measuring junction by-pass flow, thereby improved the measuring accuracy of low discharge, when the charge air flow amount is big, because air-flow rectification passage must produce the effect of outwards drawing greater than the charge air flow of air-flow bypass passage by-pass flow to the air-flow in the air-flow cushion chamber to the metering function of air-flow or/and the air-flow cushion chamber is gone into outlet structure, therefore that is to say the range that has enlarged sensor.When having inverted draft in the main channel, retaining wall will stop that inverted draft enters the air-flow cushion chamber, as a small amount of inverted draft or/and reverse turbulent flow when entering the air-flow cushion chamber, but owing to the wall attachment effect of air-flow and air-flow cushion chamber reason greater than air-flow rectification passage and air-flow cushion chamber inlet, it is slow and main with adherent form effluent stream cushion chamber to make that inverted draft flowed through near the time air-flow sensitive element, has therefore talked about the effect of shielding inverted draft for the air-flow sensitive element.
The utility model further is provided with: described retaining wall and air-flow flow channel are vertical setting, and described air-flow flow pass is arranged on the retaining wall both sides.
The utility model further is provided with: the corresponding air-flow cushion chamber of described retaining wall entry position is provided with cavity, and cavity chamber wall and retaining wall inwall are rounding off.So be provided with, the charge air flow that is entered by air-flow cushion chamber inlet is because the effect of cavity produces wall attachment effect, relaxes along the air-flow flow pass and flows out.
The utility model further is provided with again: corresponding retaining wall one side of described air-flow cushion chamber two outer walls is provided with the outside projection of Width, described retaining wall width is greater than air-flow cushion chamber width, and the retaining wall width is less than width between the air-flow cushion chamber two outer walls projection top.So be provided with,, all be difficult for entering the air-flow cushion chamber by the air-flow flow pass no matter be charge air flow or inverted draft in the main channel.And, form jet effect when helping charge air flow through the air-flow flow pass, the air-flow in the air-flow cushion chamber is produced the effect of outwards drawing.
The utility model further is provided with again: the described retaining wall outside is the arc surfaced setting, and the air-flow cushion chamber two outer walls projection top and the retaining wall outside are on same cambered surface.So be provided with, make that the inverted draft of main channel is mobile along the cambered surface in the retaining wall outside, make that inverted draft is difficult for entering the air-flow cushion chamber by the air-flow flow pass more.
In sum, the utility model automobile air flow sensor technology scheme has problems such as the inverted draft that produces in the time of handling car engine air admittance rationally and effectively, non-intake turbulance, and the harmonious better effect of air-flow measurement sensitivity.
Below in conjunction with Figure of description structure of the present utility model is further described:
Description of drawings
Fig. 1 cuts open side view for the utility model automobile air flow sensor
Fig. 2 is along the cut-open view of II-II line among Fig. 1
Fig. 3 is along the cut-open view of II-II line among Fig. 1
Embodiment
Referring to accompanying drawing 1, the disclosed automobile air flow sensor of the utility model, comprise sensor body 2, sensor main body 2 parts stretch in the shell 1 and are installed on the shell 1, electrical connector 3 is arranged on the sensor main body 2, sensing circuit 4, sensor body 2 is provided with measuring junction 5, measuring junction 5 is provided with air-flow flow channel 6, air-flow cushion chamber 7, air-flow flow pass 8, air-flow flow channel 6, air-flow cushion chamber 7, air-flow flow pass 8 is and is communicated with setting, air-flow flow channel 6 is provided with air-flow busway 601 and air-flow rectification passage 602, air-flow cushion chamber 7 is provided with air-flow cushion chamber inlet 701, air-flow busway 601 to air-flow rectification passage 602 is gradually narrow formula setting, preferably, present embodiment is gradually narrow formula setting in both sides.Air-flow rectification passage 602 to air-flow cushion chamber inlet 701 is gradually wide formula setting, and is preferred, and present embodiment is corresponding to be gradually narrow formula setting in both sides.Air-flow cushion chamber 7 interior corresponding air-flow cushion chambers are gone into 701 mouthfuls of positions and are provided with air-flow sensitive element 9, air-flow cushion chamber 7 corresponding air-flow cushion chambers 701 opposite sides that enter the mouth are provided with retaining wall 10, preferably, retaining wall 10 is vertical setting with air-flow flow channel 6, and air-flow flow pass 8 is arranged on retaining wall 10 both sides.
Referring to accompanying drawing 2, when having charge air flow 16 in the main channel 101 of shell 1, might carry secretly pulse pneumatic and/the part air-flow 15 of non-intake turbulance enters air-flow flow channel 6, through air-flow busway 601, air-flow rectification passage 602 suppresses non-intake turbulance and is made in order level and smooth air-flow by rectification, enter air-flow cushion chamber 7 and flow to air-flow sensitive element 9 through air-flow cushion chamber inlet 701 straight, simultaneously because the space when air-flow rectification passage 602 carries out the transition to air-flow cushion chamber 7 becomes big suddenly, so produce some eddy current 19, eddy current 19 can produce the afterflow effect to pulse pneumatic; The part air-flow forms air-flow stably through after the above-mentioned processing, and air-flow circling gas flow sensitive element 9 flows through, and flows out from air-flow flow pass 8 at last, and sneaks into from the charge air flow 16 of measuring junction 5 by-pass flows; When charge air flow 16 amount hour, air-flow 20 in 16 pairs of air-flow cushion chambers of charge air flow of measuring junction by-pass flow produces the effect of outwards drawing, thereby improved the measuring accuracy of low discharge, when charge air flow amount 16 is big, because air-flow rectification passage 602 and air-flow cushion chamber inlet 701 is constructed to such an extent that the metering function of air-flow is produced the effect of outwards drawing greater than the air-flows in 16 pairs of air-flow cushion chambers of charge air flow 7 of air-flow bypass passage by-pass flow 20, therefore that is to say the range that has enlarged sensor.
Referring to accompanying drawing 3, when having inverted draft 14 in the main channel 101 of shell 1, retaining wall 10 will stop that inverted draft 14 enters air-flow cushion chamber 7, as a small amount of inverted draft or/and reverse turbulent flow when entering the air-flow cushion chamber, but owing to the wall attachment effect of air-flow and air-flow cushion chamber 7 reason greater than air-flow rectification passage 602 and air-flow cushion chamber inlet 701, it is slow and main with adherent form effluent stream cushion chamber 7 to make that inverted draft 18 flowed through near the time air-flow sensitive element 9, has therefore talked about the effect of shielding inverted draft 14 for air-flow sensitive element 7.
The corresponding air-flow cushion chamber of retaining wall entry position is provided with cavity 101, and cavity 101 chamber walls and retaining wall inwall are rounding off.So be provided with, because the effect of cavity 101 produces wall attachment effect, relax along air-flow flow pass 8 and to flow out when the charge air flow that is entered by air-flow cushion chamber inlet flows to retaining wall 10.
7 liang of outer walls of air-flow cushion chamber, 11 corresponding retaining wall one sides are provided with the outside projection of Width 111, and retaining wall 10 width are greater than air-flow cushion chamber 7 width, and retaining wall 10 width are less than width between air-flow cushion chamber two outer walls projection 111 tops.So be provided with,, all be difficult for entering air-flow cushion chamber 7 by air-flow flow pass 8 no matter be charge air flow 16 or inverted draft 14 in the main channel.And, form jet effect when helping charge air flow 16 through air-flow flow pass 8, the air-flow in the air-flow cushion chamber 20 is produced the effect of outwards drawing.
Retaining wall 10 outsides are the arc surfaced setting, and 7 liang of outer wall projection 111 tops of air-flow cushion chamber and retaining wall 10 outsides are on same cambered surface.So be provided with, make the inverted draft 14 of main channel 101 of shell 1 flow, make that inverted draft 14 is difficult for entering air-flow cushion chamber 7 by air-flow flow pass 8 more along the cambered surface in the retaining wall outside.
Claims (5)
1. automobile air flow sensor, comprise sensor body, sensor body is provided with measuring junction, it is characterized in that: described measuring junction is provided with the air-flow flow channel, the air-flow cushion chamber, the air-flow flow pass, the air-flow flow channel, the air-flow cushion chamber, the air-flow flow pass is and is communicated with setting, the air-flow flow channel is provided with air-flow busway and air-flow rectification passage, the air-flow cushion chamber is provided with air-flow cushion chamber inlet, described air-flow busway to air-flow rectification passage is gradually narrow formula setting, air-flow rectification passage to air-flow cushion chamber inlet is gradually wide formula setting, place, corresponding air-flow cushion chamber entry position is provided with the air-flow sensitive element in the air-flow cushion chamber, and the corresponding air-flow cushion chamber inlet of air-flow cushion chamber opposite side is provided with retaining wall.
2. automobile air flow sensor as claimed in claim 1 is characterized in that: described retaining wall and air-flow flow channel are vertical setting, and described air-flow flow pass is arranged on the retaining wall both sides.
3. automobile air flow sensor as claimed in claim 2 is characterized in that: the corresponding air-flow cushion chamber of described retaining wall entry position is provided with cavity, and cavity chamber wall and retaining wall inwall are rounding off.
4. as claim 1 or 2 or 3 described automobile air flow sensors, it is characterized in that: corresponding retaining wall one side of described air-flow cushion chamber two outer walls is provided with the outside projection of Width, described retaining wall width is greater than air-flow cushion chamber width, and the retaining wall width is less than width between the air-flow cushion chamber two outer walls projection top.
5. automobile air flow sensor as claimed in claim 4 is characterized in that: the described retaining wall outside is the arc surfaced setting, and the air-flow cushion chamber two outer walls projection top and the retaining wall outside are on same cambered surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201208057U CN201600156U (en) | 2010-02-26 | 2010-02-26 | Vehicle air flow sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201208057U CN201600156U (en) | 2010-02-26 | 2010-02-26 | Vehicle air flow sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201600156U true CN201600156U (en) | 2010-10-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201208057U Expired - Fee Related CN201600156U (en) | 2010-02-26 | 2010-02-26 | Vehicle air flow sensor |
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| Country | Link |
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| CN (1) | CN201600156U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105393114A (en) * | 2013-06-21 | 2016-03-09 | 日立汽车系统株式会社 | Gas sensor device and installation structure of gas sensor device |
| CN107201961A (en) * | 2016-03-16 | 2017-09-26 | 通用汽车环球科技运作有限责任公司 | Include the mass air flow sensor of one or more air deflectors for suppressing the reverse air flow by mass air flow sensor |
| CN109416269A (en) * | 2016-06-27 | 2019-03-01 | 恩德斯+豪斯流量技术股份有限公司 | Method for the sensor of hot-fluid measuring device, hot-fluid measuring device and the sensor for manufacturing hot-fluid measuring device |
-
2010
- 2010-02-26 CN CN2010201208057U patent/CN201600156U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105393114A (en) * | 2013-06-21 | 2016-03-09 | 日立汽车系统株式会社 | Gas sensor device and installation structure of gas sensor device |
| CN105393114B (en) * | 2013-06-21 | 2018-03-16 | 日立汽车系统株式会社 | Gas sensor device and installation structure of gas sensor device |
| CN107201961A (en) * | 2016-03-16 | 2017-09-26 | 通用汽车环球科技运作有限责任公司 | Include the mass air flow sensor of one or more air deflectors for suppressing the reverse air flow by mass air flow sensor |
| CN107201961B (en) * | 2016-03-16 | 2021-05-25 | 通用汽车环球科技运作有限责任公司 | Mass air flow sensor including one or more flow directors for inhibiting reverse air flow through the mass air flow sensor |
| CN109416269A (en) * | 2016-06-27 | 2019-03-01 | 恩德斯+豪斯流量技术股份有限公司 | Method for the sensor of hot-fluid measuring device, hot-fluid measuring device and the sensor for manufacturing hot-fluid measuring device |
| US10989581B2 (en) | 2016-06-27 | 2021-04-27 | Endress+Hauser Flowtec Ag | Sensor for a thermal, flow measuring device having sensor element spacing protrusions |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101006 Termination date: 20140226 |