CN105804910B - A kind of highly sensitive fuel injection beginning of diesel engine sensor - Google Patents
A kind of highly sensitive fuel injection beginning of diesel engine sensor Download PDFInfo
- Publication number
- CN105804910B CN105804910B CN201610163556.1A CN201610163556A CN105804910B CN 105804910 B CN105804910 B CN 105804910B CN 201610163556 A CN201610163556 A CN 201610163556A CN 105804910 B CN105804910 B CN 105804910B
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- China
- Prior art keywords
- iron core
- shell
- armature
- needle
- permanent magnet
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The present invention relates to a kind of highly sensitive fuel injection beginning of diesel engine sensors, including shell, permanent magnet, iron core, coil rack, induction coil, needle-valve connecting rod, armature, spring, permanent magnet is connected with iron core is installed along with enclosure interior side circular central position, the polarization direction of permanent magnet along shell and iron core axis direction；Iron core passes through coil rack, induction coil to be wound on coil rack, the flux change of inductive iron core；Iron core forms the air gap δ with armature, armature is connect with shell by clearance fit, needle-valve connecting rod forms component with spring, armature, and needle-valve connecting rod compressed spring continues to move to until completing valve opening action after pioneer's moving armature eliminates the air gap δ when needle-valve connecting rod acts；Permanent magnet, iron core, armature and shell constitute closed magnetic circuit.Inventive sensor can capture the moment of needle-valve unlatching with sensitivity, and the output signal of sensor is big, noise is small, the stable output signal of sensor.
Description
Technical field
The present invention relates to a kind of highly sensitive fuel injection beginning of diesel engine sensors.
Background technology
Injection advance angle is one of most important parameter in working process of diesel engine.It is to the power of diesel engine, efficiency, row
It puts etc. and all to have a great impact.It is existing measure fuel injection beginning of diesel engine method include：Based on detection charge oil pressure variation
Method, the method based on detection fuel feed pump pulsation and the method etc. based on detection oil-fuel injector needle-valve movement.Based on detection fuel feeding
The method of pressure change with the method for detection fuel feed pump pulsation in practical applications because operating mode is different, hold by installation relatively simple for structure
Easily, but precision is not high.Based on detection oil-fuel injector needle-valve movement method be by detect needle-valve displacement, speed or acceleration come
Work, due to, come what is realized, being easy to get relatively high precision according to the definition of injection advance angle, being now mainly used for diesel engine
Laboratory bench experiment.But this kind of sensor needs given threshold to judge the unlatching of needle-valve when handling output signal
Moment.When set threshold value is relatively low, system is susceptible to erroneous judgement, is unable to reliably working；The meeting when threshold setting values are excessively high
So that sensor is detected that needle-valve start-up time is delayed, reduce the accuracy in detection of needle-valve open phase, or even cannot detect needle
The breakdown action of valve.
Invention content
In view of the above problems, the present invention proposes a kind of highly sensitive fuel injection beginning of diesel engine sensor.It can be high
Delicately detect the moment that needle-valve is opened, and the output signal of sensor is big, noise is small, signal stabilization.
In order to achieve the above objectives, present inventive concept is as follows：
This sensor is based on space-changeable type electromagnetic sensor principle, and the magnetic circuit reluctance of this electromagnetic sensor is mainly distributed on rank
Air gap region between iron and iron core, and the magnetic resistance of air gap portion and gas length δ are directly proportional；When air gap " having " and "None" it
Between change, the inductance value of electromagnetic coil is mutated, and under the conditions of DC excitation, induces a prodigious EMF pulse.
Based on this principle, this sensor connects needle-valve by spring etc. with armature, and needle-valve opens preceding gas between armature and iron core
Gap δ is designed minimum, is much smaller than the stroke of needle-valve.When needle-valve is opened, needle-valve driving armature is moved to iron core direction, works as air gap
After δ is eliminated, armature does not continue to move, but needle-valve can still continue to move to, and completes valve opening action.Since air gap is minimum, in needle
The moment that valve starts just completes the elimination of air gap, and magnetic circuit reluctance moment becomes minimum from maximum, until the moment that needle-valve is closed,
Air gap is restored to initial distance, and magnetic circuit reluctance becomes maximum again by minimum.If using DC excitation, opened and closed in needle-valve
Moment induction coil can induce one positive one two negative induced electromotive force pulses.Needle-valve can be obtained according to pulse signal
The definite moment opened.
According to above-mentioned design, the present invention adopts the following technical scheme that：
A kind of highly sensitive fuel injection beginning of diesel engine sensor, including shell, permanent magnet, iron core, coil rack, induction
Coil, needle-valve connecting rod, armature, spring, the permanent magnet is connected with iron core is installed along with enclosure interior side circular central
Position, the polarization direction of permanent magnet along shell and iron core axis direction；The iron core passes through coil rack, the line of induction
Circle is wound on coil rack, the flux change of inductive iron core；The iron core forms the air gap δ with armature, and armature is logical with shell
Clearance fit connection is crossed, the needle-valve connecting rod forms component with spring, armature, and pioneer's moving armature will when needle-valve connecting rod acts
Needle-valve connecting rod compressed spring continues to move to until completing valve opening action after the air gap δ is eliminated；The permanent magnet, iron core, rank
Iron and shell constitute closed magnetic circuit.
The permanent magnet replaces with annular permanent magnet, and shell is divided into left shell and right shell body, annular permanent magnet and left shell
Shell outer ring is formed together with right shell body series connection, and for annular permanent magnet between the shell of left and right, polarization direction is to be parallel to shell
Body axis direction；Further include adjusting bolt, the adjusting bolt is fixed on the axis of left shell, the iron core and adjusting bolt
It is fixedly connected, adjusting bolt is for adjusting the axial position of iron core in the housing, to adjust the initial air of iron core and armature
Gap delta realizes the adjustment of sensitivity of sensor.
The permanent magnet replaces with direct-flow magnet exciting coil, and the direct-flow magnet exciting coil is wound on coil rack, the induction
Coil is wound on direct-flow magnet exciting coil, intermediate isolating；Further include adjusting bolt, the adjusting bolt is fixed on the axis of shell
On, the iron core is fixedly connected with adjusting bolt, and adjusting bolt is for adjusting the axial position of iron core in the housing, to adjust
The initial air gap δ of iron core and armature, realizes the adjustment of sensitivity of sensor.
Compared with the prior art, the advantages of the present invention are as follows：
Inventive sensor can capture the moment of needle-valve unlatching with sensitivity, and the output signal of sensor is big, noise
Small, the stable output signal of sensor, this sensor can utilize the adjusting nut being arranged on the left of sensor to adjust iron core and rank
The size of the air gap δ between iron, to realize the adjusting to transducer sensitivity.
Description of the drawings
Fig. 1 is the cross-sectional view of the structure of the embodiment of the present invention one.
Fig. 2 is the cross-sectional view of the structure of the embodiment of the present invention two.
Fig. 3 is the cross-sectional view of the structure of the embodiment of the present invention three.
Specific implementation mode
The preferred embodiment of the present invention combination attached drawing is commented as follows.
Embodiment one：
As shown in Figure 1, a kind of highly sensitive fuel injection beginning of diesel engine sensor, including shell 1, permanent magnet 2, iron core 3,
Coil rack 4, induction coil 5, needle-valve connecting rod 6, armature 7, spring 8, the permanent magnet 2 are connected with iron core 3 and are installed along with
1 interior side circular central position of shell, the polarization direction of permanent magnet 2 along shell 1 and iron core 3 axis direction；The iron
Core 3 passes through coil rack 4, the induction coil 5 to be wound on coil rack 4, the flux change of inductive iron core 3；The iron core 3 with
Armature 7 forms the air gap δ, and armature 7 is connect with shell 1 by clearance fit, and armature 7 and the fit clearance of shell 1 are smaller, can
To be moved along axis.The permanent magnet 2, iron core 3, armature 7 and shell 1 constitute closed magnetic circuit.
When needle-valve is closed, there are the air gap δ with armature 7 for iron core 3, and pioneer's moving armature 7 will when needle-valve connecting rod 6 acts
After the air gap δ is eliminated, armature 7 does not continue to move, but 6 compressed spring 8 of needle-valve connecting rod continues to move to until completing valve opening
Action.When needle-valve is closed, needle-valve connecting rod 6 is moved away from the direction of iron core 3, and then band moving armature 7 moves together, empty
Gas gap delta is restored.
Embodiment two：
The present embodiment is relative to embodiment one, as shown in Fig. 2, permanent magnet 2 is replaced with annular permanent magnet, shell by the present embodiment
Body 1 divides for left shell 1a and right shell body 1b, and annular permanent magnet is connected with left shell 1a and right shell body 1b forms shell outer ring together,
For annular permanent magnet between the shell of left and right, polarization direction is to be parallel to 1 axis direction of shell；Further include adjusting bolt 9, institute
It states adjusting bolt 9 to be fixed on the axis of left shell 1a, the iron core 3 is fixedly connected with adjusting bolt 9, and adjusting bolt 9 is used for
It adjusts the axial position of iron core 3 within the case 1 and realizes sensor to adjust the initial air gap δ of iron core 3 and armature 7
Adjustment of sensitivity.Advantage of this embodiment is that the structure of sensor can be made compacter, annular permanent magnet excitation intensity is big,
Big signal can be exported.
Embodiment three：
The present embodiment is relative to embodiment one, as shown in figure 3, permanent magnet 2 is replaced with direct-flow magnet exciting coil by the present embodiment,
The direct-flow magnet exciting coil is wound on coil rack 4, and the induction coil 5 is wound on direct-flow magnet exciting coil, intermediate isolating；Also wrap
Adjusting bolt 9 is included, the adjusting bolt 9 is fixed on the axis of shell 1, and the iron core 3 is fixedly connected with adjusting bolt 9, is adjusted
Section bolt 9 is for adjusting the axial position of iron core 3 within the case 1, to adjust the initial air gap δ of iron core 3 and armature 7,
Realize the adjustment of sensitivity of sensor.Advantage of this embodiment is that can be obtained by the size of current for changing direct-flow magnet exciting coil
To the suitable magnetic field intensity of magnetic circuit.
Claims (3)
1. a kind of fuel injection beginning of diesel engine sensor, which is characterized in that including shell (1), permanent magnet (2), iron core (3), line
Ring framework (4), induction coil (5), needle-valve connecting rod (6), armature (7), spring (8), the permanent magnet (2) are gone here and there with iron core (3)
Connection is installed along with shell (1) interior side circular central position, and the polarization direction of permanent magnet (2) is along shell (1) and iron core
(3) axis direction；The iron core (3) passes through coil rack (4), the induction coil (5) to be wound on coil rack (4), feels
Answer the flux change of iron core (3)；The iron core (3) forms the air gap (δ) with armature (7), and armature (7) passes through with shell (1)
Clearance fit connects, and the needle-valve connecting rod (6) forms component with spring (8), armature (7), first when needle-valve connecting rod (6) acts
Needle-valve connecting rod (6) compressed spring (8) continues to move to move until completing valve opening after driving armature (7) eliminates the air gap (δ)
Make；The permanent magnet (2), iron core (3), armature (7) and shell (1) constitute closed magnetic circuit, when needle-valve is closed, iron core (3) and
There are the air gap (δ) for armature (7), after when needle-valve connecting rod (6) act, pioneer's moving armature (7) eliminates the air gap (δ),
Armature (7) does not continue to move, but needle-valve connecting rod (6) compressed spring (8) continues to move to until completing valve opening action；In needle-valve
When closing, needle-valve connecting rod (6) is moved away from the direction of iron core (3), and then band moving armature (7) moves together, between air
Gap (δ) is restored.
2. fuel injection beginning of diesel engine sensor according to claim 1, which is characterized in that the permanent magnet (2) replaces with
Annular permanent magnet, shell (1) are divided into left shell (1a) and right shell body (1b), annular permanent magnet and left shell (1a) and right shell body
(1b) series connection forms shell outer ring together, and for annular permanent magnet between the shell of left and right, polarization direction is to be parallel to shell (1)
Axis direction；Further include adjusting bolt (9), the adjusting bolt (9) is fixed on the axis of left shell (1a), the iron core
(3) it being fixedly connected with adjusting bolt (9), adjusting bolt (9) is used to adjust axial position of the iron core (3) in shell (1), to
The initial air gap (δ) for adjusting iron core (3) and armature (7), realizes the adjustment of sensitivity of sensor.
3. fuel injection beginning of diesel engine sensor according to claim 1, which is characterized in that the permanent magnet (2) replaces with
Direct-flow magnet exciting coil, the direct-flow magnet exciting coil are wound on coil rack (4), and the induction coil (5) is wound on DC excitation line
On circle, intermediate isolating；Further include adjusting bolt (9), the adjusting bolt (9) is fixed on the axis of shell (1), the iron core
(3) it being fixedly connected with adjusting bolt (9), adjusting bolt (9) is used to adjust axial position of the iron core (3) in shell (1), to
The initial air gap δ for adjusting iron core (3) and armature (7), realizes the adjustment of sensitivity of sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610163556.1A CN105804910B (en) | 2016-03-19 | 2016-03-19 | A kind of highly sensitive fuel injection beginning of diesel engine sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610163556.1A CN105804910B (en) | 2016-03-19 | 2016-03-19 | A kind of highly sensitive fuel injection beginning of diesel engine sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105804910A CN105804910A (en) | 2016-07-27 |
| CN105804910B true CN105804910B (en) | 2018-08-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610163556.1A Expired - Fee Related CN105804910B (en) | 2016-03-19 | 2016-03-19 | A kind of highly sensitive fuel injection beginning of diesel engine sensor |
Country Status (1)
| Country | Link |
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| CN (1) | CN105804910B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4247052A (en) * | 1979-10-09 | 1981-01-27 | General Motors Corporation | Electromagnetic fuel injector |
| US5131599A (en) * | 1989-09-22 | 1992-07-21 | Robert Bosch Gmbh | Fuel injection valve |
| CN102506219A (en) * | 2011-12-08 | 2012-06-20 | 北京控制工程研究所 | Permanent magnetic valve with characteristic of fast response |
| CN103500689A (en) * | 2013-09-27 | 2014-01-08 | 哈尔滨工业大学 | Electromagnetic structure of high-power relay |
| CN104913099A (en) * | 2014-10-15 | 2015-09-16 | 潍坊力创电子科技有限公司 | Conical sealing type hydraulic large-flow high-speed digital valve |
-
2016
- 2016-03-19 CN CN201610163556.1A patent/CN105804910B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4247052A (en) * | 1979-10-09 | 1981-01-27 | General Motors Corporation | Electromagnetic fuel injector |
| US5131599A (en) * | 1989-09-22 | 1992-07-21 | Robert Bosch Gmbh | Fuel injection valve |
| CN102506219A (en) * | 2011-12-08 | 2012-06-20 | 北京控制工程研究所 | Permanent magnetic valve with characteristic of fast response |
| CN103500689A (en) * | 2013-09-27 | 2014-01-08 | 哈尔滨工业大学 | Electromagnetic structure of high-power relay |
| CN104913099A (en) * | 2014-10-15 | 2015-09-16 | 潍坊力创电子科技有限公司 | Conical sealing type hydraulic large-flow high-speed digital valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105804910A (en) | 2016-07-27 |
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Granted publication date: 20180807 |
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