CN111535964A - Common rail oil sprayer with quick switching function - Google Patents
Common rail oil sprayer with quick switching function Download PDFInfo
- Publication number
- CN111535964A CN111535964A CN202010586033.4A CN202010586033A CN111535964A CN 111535964 A CN111535964 A CN 111535964A CN 202010586033 A CN202010586033 A CN 202010586033A CN 111535964 A CN111535964 A CN 111535964A
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- Prior art keywords
- hole
- section
- oil inlet
- control valve
- oil
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- 230000007704 transition Effects 0.000 claims abstract description 11
- 238000009434 installation Methods 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000005507 spraying Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 84
- 239000000446 fuel Substances 0.000 description 17
- 239000000295 fuel oil Substances 0.000 description 9
- 238000002485 combustion reaction Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 230000001174 ascending effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Images
Classifications
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- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
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- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
- F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
-
- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
Abstract
The invention discloses a common rail oil sprayer with a quick switching function, which comprises an oil sprayer body, and an electromagnetic control valve, a transition gasket, a metering valve and a control valve sleeve which are arranged in the oil sprayer body; the control valve sleeve is provided with an oil inlet adjusting hole, and the oil inlet adjusting hole can be dynamically opened and closed along with the action of the needle valve; the beneficial technical effects of the invention are as follows: the beneficial technical effects of the invention are as follows: the proposal provides the common rail oil sprayer with the rapid switching function, can effectively improve the spraying effect of the common rail oil sprayer, improves the economical efficiency of the operation of an engine, and is beneficial to environmental protection.
Description
Technical Field
The invention relates to a high-pressure common rail oil injection technology, in particular to a common rail oil injector with a quick switching function.
Background
The common rail oil injector generally comprises an electromagnetic control valve, a metering valve sealing mechanism, a metering valve, a control valve sleeve and a needle valve, wherein the electromagnetic control valve, the metering valve sealing mechanism, the metering valve, the control valve sleeve and the needle valve are distributed from top to bottom; when oil is injected in a pressure relief mode, the electromagnetic control valve is electrified, the metering valve sealing mechanism enables the oil outlet metering hole in the metering valve to be opened under the action of the electromagnetic control valve, at the moment, the amount of fuel entering the control valve sleeve through the oil inlet metering hole is smaller than the amount of fuel flowing out of the oil outlet metering hole, the pressure of the fuel in the control valve sleeve is rapidly reduced, the needle valve is jacked up by high-pressure fuel at the lower part, and the nozzle is opened; when the electromagnetic control valve is closed to store pressure, the electromagnetic control valve is powered off, the metering valve sealing mechanism closes an oil outlet metering hole in the metering valve, fuel oil flowing into the control valve sleeve through the oil inlet metering hole enables the pressure of the fuel oil in the control valve sleeve to be rapidly increased, the pressure of the fuel oil at the upper part and the lower part of the needle valve is gradually balanced, the needle valve falls under the action of the reset spring, and the nozzle is closed;
there are problems in that: based on the prior art, in order to achieve a better combustion effect, in the oil injection process, the needle valve can be preferably enabled to move upwards at a higher speed, so that a large amount of fuel oil can be rapidly sprayed out to participate in combustion within a very short time, and in the closing process, the needle valve can also be preferably enabled to move downwards at a higher speed, so that a nozzle can be rapidly closed, and the situation that the fuel oil still enters a combustion chamber to be insufficiently combusted when the combustion process is finished is avoided;
because only one normally open oil inlet metering hole is arranged on the control valve sleeve, the amount of fuel oil entering the control valve sleeve cannot be dynamically adjusted, the movement speed of the needle valve is limited, and the opening and closing speeds of the nozzle are not ideal.
Disclosure of Invention
Aiming at the problems in the background art, the invention provides a common rail oil injector with a quick switching function, which comprises an oil injector body, wherein an electromagnetic control valve, a transition gasket, a metering valve and a control valve sleeve are sequentially arranged in an inner cavity of the oil injector body from top to bottom; an installation cavity axially penetrating through the transition gasket is arranged in the transition gasket, and an armature mechanism is arranged in the installation cavity; the armature mechanism comprises an armature shaft, an armature and a first reset spring, the armature is arranged in the installation cavity, the middle part of the installation cavity is provided with a limiting surface, the first reset spring is arranged between the lower end surface and the limiting surface of the armature, the armature shaft is sleeved in an inner hole of the armature, and the upper end of the armature shaft is in transmission connection with a control spring in the electromagnetic control valve; an oil outlet metering hole is arranged in the metering valve, and a steel ball is tightly propped against the conical surface of the upper port of the oil outlet metering hole by the lower end of the armature shaft; a needle valve is sleeved in an inner hole of the control valve sleeve, a limiting ring is arranged in the middle of the needle valve, a second return spring is arranged between the control valve sleeve and the limiting ring, and the second return spring enables the control valve sleeve to be tightly abutted against the lower end face of the metering valve;
the innovation lies in that: the inner hole of the control valve sleeve sequentially forms a control section, a guide section and a spring mounting section from top to bottom; the inner diameter of the control section is larger than that of the guide section, and the inner diameter of the guide section is smaller than that of the spring mounting section; a supporting surface is formed at the junction of the guide section and the spring mounting section, and the upper end of the second return spring is contacted with the supporting surface;
an oil inlet metering hole and an oil inlet adjusting hole are formed in the inner wall of the through hole; the axial direction of the oil inlet metering hole is coincided with the radial direction of the through hole, the inner port of the oil inlet metering hole is positioned on the side wall of the control section, the outer port of the oil inlet metering hole is communicated with the outer wall of the control valve sleeve, and the position of the oil inlet metering hole is close to the guide section; the axial direction of the oil inlet adjusting hole is coincided with the radial direction of the through hole, the inner port of the oil inlet adjusting hole is positioned on the side wall of the guide section, the outer port of the oil inlet adjusting hole is communicated with the outer wall of the control valve sleeve, and the position of the oil inlet adjusting hole is close to the control section;
the upper part of the needle valve forms a guide area, the outer diameter of the upper section of the guide area is smaller than that of the lower section of the guide area, an annular step is formed at the junction of the upper section of the guide area and the lower section of the guide area, and the outer diameter of the lower section of the guide area is matched with the inner diameter of the guide section;
when the upper end surface of the needle valve is contacted with the lower end surface of the metering valve, the inner port of the oil inlet metering hole is opposite to the upper section of the guide area, and the lower section of the guide area seals the inner port of the oil inlet adjusting hole;
when the needle valve is located at the downward maximum stroke position, the inner port of the oil inlet adjusting hole is opposite to the upper section of the guide area.
The structure and the basic working principle of the common rail oil sprayer are different from those of the prior art, the innovation point of the common rail oil sprayer is that the structure of the control valve sleeve is changed, and the working principle of the control valve sleeve with a new structure is as follows:
when oil is not injected, the needle valve (under the action of the second return spring) is positioned at the downward maximum stroke position, the armature and the armature shaft (under the action of the control spring) are also positioned at the downward maximum stroke position, at the moment, the armature shaft (a ball seat is also arranged between the armature shaft and the steel ball during specific implementation) tightly supports the steel ball on the conical surface of the upper port of the oil outlet metering hole, the oil outlet metering hole is in a closed state, and the oil inlet metering hole and the oil inlet adjusting hole can communicate the through hole with the outer wall of the control valve sleeve;
when oil is injected, the electromagnetic control valve is electrified, the armature is upwards sucked by the electromagnetic control valve, so that the armature shaft is upwards lifted, the upper part of the steel ball loses support, high-pressure fuel in the oil outlet metering hole jacks up the steel ball, the oil outlet metering hole is opened, the fuel is outwards discharged through the oil outlet metering hole, the pressure of the fuel in the control valve sleeve is rapidly reduced as the quantity of the fuel discharged from the oil outlet metering hole is larger than that of the fuel entering from the oil inlet metering hole and the oil inlet adjusting hole, the needle valve is jacked up by the high-pressure fuel at the lower part, and the nozzle is opened; in the process, along with the upward movement of the needle valve, the lower section of the guide area gradually shields the oil inlet adjusting hole until the oil inlet adjusting hole is completely closed, so that the amount of fuel entering the control valve sleeve is gradually reduced, the difference value between the amount of fuel flowing out of the oil outlet metering hole and the amount of fuel entering the control valve sleeve is further increased, correspondingly, the fuel pressure difference between the upper end and the lower end of the needle valve is further increased, the needle valve can quickly move upward, the nozzle quickly reaches the maximum opening state, and a large amount of fuel is quickly sprayed out and participates in combustion;
when the oil injection state is converted into the closed state, the electromagnetic control valve is powered off, the armature and the armature shaft (under the action of the control spring) reset downwards, the armature shaft tightly supports the steel ball on the conical surface of the upper port of the oil outlet metering hole again, the oil outlet metering hole is closed, high-pressure fuel oil entering the control valve sleeve through the oil inlet metering hole enables the pressure in the control valve sleeve to rise rapidly, and the needle valve moves downwards along with the high-pressure fuel oil; in the process, along with descending of the needle valve, the lower section of the guide area can gradually open the oil inlet adjusting hole until the oil inlet adjusting hole is completely opened, and along with the opening of the oil inlet adjusting hole, the fuel oil quantity entering the control valve sleeve can be gradually increased, so that the rising speed of the oil pressure in the control valve sleeve is increased, the needle valve can descend at a high speed, and the nozzle is quickly closed.
After the scheme is adopted, when the common rail oil sprayer works, along with the movement of the needle valve, the device can automatically and dynamically adjust the fuel quantity entering the control valve sleeve, so that the ascending speed and the descending speed of the needle valve are greatly improved, the combustion effect of the fuel can be finally improved, and the operation of an engine is more economic and environment-friendly.
Preferably, the oil inlet metering hole and the oil inlet adjusting hole are symmetrically arranged along the axis of the through hole. The optimal scheme can avoid the excessive concentration of the pore channel structure and is favorable for stress balance.
The beneficial technical effects of the invention are as follows: the proposal provides the common rail oil sprayer with the rapid switching function, can effectively improve the spraying effect of the common rail oil sprayer, improves the economical efficiency of the operation of an engine, and is beneficial to environmental protection.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a schematic sectional structure view of a control valve sleeve;
FIG. 3 is a partial enlarged view I of the position of a control valve sleeve on the common rail injector (in the figure, the needle valve is at the position of the descending maximum stroke);
FIG. 4 is a partial enlarged view of a control valve sleeve position on the common rail injector, namely a second valve (in the figure, the needle valve is at an upward maximum stroke position);
the names corresponding to each mark in the figure are respectively: the oil injection device comprises an oil injector body A, an electromagnetic control valve B, a transition gasket C, a metering valve D, a control valve sleeve 1, a control section 2, a guide section 3, a spring mounting section 4, an oil inlet metering hole 5, an oil inlet adjusting hole 6, a first return spring 7, a steel ball 8, a second return spring 9 and a needle valve 10.
Detailed Description
A common rail oil injector with a quick switching function comprises an oil injector body A, wherein an electromagnetic control valve B, a transition gasket C, a metering valve D and a control valve sleeve 1 are sequentially arranged in an inner cavity of the oil injector body A from top to bottom; an installation cavity axially penetrating through the transition gasket C is arranged in the transition gasket C, and an armature mechanism is arranged in the installation cavity; the armature mechanism comprises an armature shaft, an armature and a first reset spring, the armature is arranged in the installation cavity, the middle part of the installation cavity is provided with a limiting surface, the first reset spring is arranged between the lower end surface and the limiting surface of the armature, the armature shaft is sleeved in an inner hole of the armature, and the upper end of the armature shaft is in transmission connection with a control spring in the electromagnetic control valve B; an oil outlet metering hole is formed in the metering valve D, and a steel ball is tightly propped against the conical surface of the upper port of the oil outlet metering hole by the lower end of the armature shaft; a needle valve is sleeved in an inner hole of the control valve sleeve 1, a limiting ring is arranged in the middle of the needle valve, a second return spring is arranged between the control valve sleeve 1 and the limiting ring, and the second return spring enables the control valve sleeve 1 to be tightly abutted against the lower end face of the metering valve D;
the innovation lies in that: an inner hole of the control valve sleeve 1 sequentially forms a control section 2, a guide section 3 and a spring mounting section 4 from top to bottom; the inner diameter of the control section 2 is larger than that of the guide section 3, and the inner diameter of the guide section 3 is smaller than that of the spring mounting section 4; a supporting surface is formed at the junction of the guide section 3 and the spring mounting section 4, and the upper end of the second return spring is contacted with the supporting surface;
an oil inlet metering hole 5 and an oil inlet adjusting hole 6 are formed in the inner wall of the through hole; the axial direction of the oil inlet metering hole 5 is coincided with the radial direction of the through hole, the inner port of the oil inlet metering hole 5 is positioned on the side wall of the control section 2, the outer port of the oil inlet metering hole 5 is communicated with the outer wall of the control valve sleeve 1, and the position of the oil inlet metering hole 5 is close to the guide section 3; the axial direction of the oil inlet adjusting hole 6 is coincided with the radial direction of the through hole, the inner port of the oil inlet adjusting hole 6 is positioned on the side wall of the guide section 3, the outer port of the oil inlet adjusting hole 6 is communicated with the outer wall of the control valve sleeve 1, and the position of the oil inlet adjusting hole 6 is close to the control section 2;
the upper part of the needle valve forms a guide area, the outer diameter of the upper section of the guide area is smaller than that of the lower section of the guide area, an annular step is formed at the junction of the upper section of the guide area and the lower section of the guide area, and the outer diameter of the lower section of the guide area is matched with the inner diameter of the guide section 3;
when the upper end surface of the needle valve is contacted with the lower end surface of the metering valve D, the inner port of the oil inlet metering hole 5 is opposite to the upper section of the guide area, and the lower section of the guide area seals the inner port of the oil inlet adjusting hole 6;
when the needle valve is located at the downward maximum stroke position, the inner port of the oil feed adjusting hole 6 is opposed to the guide area upper section.
Further, the oil inlet metering hole 5 and the oil inlet adjusting hole 6 are symmetrically arranged along the axis of the through hole.
Claims (2)
1. A common rail oil injector with a quick switching function comprises an oil injector body (A), wherein an electromagnetic control valve (B), a transition gasket (C), a metering valve (D) and a control valve sleeve (1) are sequentially arranged in an inner cavity of the oil injector body (A) from top to bottom; an installation cavity axially penetrating through the transition gasket (C) is arranged in the transition gasket (C), and an armature mechanism is arranged in the installation cavity; the armature mechanism comprises an armature shaft, an armature and a first reset spring, the armature is arranged in the installation cavity, the middle part of the installation cavity is provided with a limiting surface, the first reset spring is arranged between the lower end surface and the limiting surface of the armature, the armature shaft is sleeved in an inner hole of the armature, and the upper end of the armature shaft is in transmission connection with a control spring in the electromagnetic control valve (B); an oil outlet metering hole is formed in the metering valve (D), and a steel ball is tightly propped against the conical surface of the upper port of the oil outlet metering hole by the lower end of the armature shaft; a needle valve is sleeved in an inner hole of the control valve sleeve (1), a limiting ring is arranged in the middle of the needle valve, a second return spring is arranged between the control valve sleeve (1) and the limiting ring, and the second return spring enables the control valve sleeve (1) to be tightly abutted against the lower end face of the metering valve (D);
the method is characterized in that: an inner hole of the control valve sleeve (1) sequentially forms a control section (2), a guide section (3) and a spring mounting section (4) from top to bottom; the inner diameter of the control section (2) is larger than that of the guide section (3), and the inner diameter of the guide section (3) is smaller than that of the spring mounting section (4); a supporting surface is formed at the junction of the guide section (3) and the spring mounting section (4), and the upper end of the second return spring is contacted with the supporting surface;
an oil inlet metering hole (5) and an oil inlet adjusting hole (6) are formed in the inner wall of the through hole; the axial direction of the oil inlet metering hole (5) is coincided with the radial direction of the through hole, the inner port of the oil inlet metering hole (5) is positioned on the side wall of the control section (2), the outer port of the oil inlet metering hole (5) is communicated with the outer wall of the control valve sleeve (1), and the position of the oil inlet metering hole (5) is close to the guide section (3); the axial direction of the oil inlet adjusting hole (6) is coincided with the radial direction of the through hole, the inner port of the oil inlet adjusting hole (6) is positioned on the side wall of the guide section (3), the outer port of the oil inlet adjusting hole (6) is communicated with the outer wall of the control valve sleeve (1), and the position of the oil inlet adjusting hole (6) is close to the control section (2);
the upper part of the needle valve forms a guide area, the outer diameter of the upper section of the guide area is smaller than that of the lower section of the guide area, an annular step is formed at the junction of the upper section of the guide area and the lower section of the guide area, and the outer diameter of the lower section of the guide area is matched with the inner diameter of the guide section (3);
when the upper end surface of the needle valve is contacted with the lower end surface of the metering valve (D), the inner port of the oil inlet metering hole (5) is opposite to the upper section of the guide area, and the lower section of the guide area seals the inner port of the oil inlet adjusting hole (6);
when the needle valve is located at the downward maximum stroke position, the inner port of the oil inlet adjusting hole (6) is opposite to the upper section of the guide area.
2. The common rail injector with the quick switch function according to claim 1, characterized in that: the oil inlet metering hole (5) and the oil inlet adjusting hole (6) are symmetrically arranged along the axis of the through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010586033.4A CN111535964A (en) | 2020-06-24 | 2020-06-24 | Common rail oil sprayer with quick switching function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010586033.4A CN111535964A (en) | 2020-06-24 | 2020-06-24 | Common rail oil sprayer with quick switching function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111535964A true CN111535964A (en) | 2020-08-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010586033.4A Pending CN111535964A (en) | 2020-06-24 | 2020-06-24 | Common rail oil sprayer with quick switching function |
Country Status (1)
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| CN (1) | CN111535964A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060000453A1 (en) * | 2004-06-30 | 2006-01-05 | C.R.F. Societa Consortile Per Azioni | Servo valve for controlling an internal combustion engine fuel injector |
| DE102011082666A1 (en) * | 2011-09-14 | 2013-03-14 | Robert Bosch Gmbh | Fuel injector, particularly for common-rail-injection system, has nozzle needle, which closes nozzle hole assembly in nozzle body in closed position, where nozzle needle is arranged in high-pressure chamber in nozzle body |
| CN203098110U (en) * | 2013-01-10 | 2013-07-31 | 无锡开普机械有限公司 | Electronic-control fuel injector of injection valve |
| CN103498743A (en) * | 2013-10-23 | 2014-01-08 | 重庆红江机械有限责任公司 | Control valve of high-pressure common rail electric fuel injector |
| CN109139319A (en) * | 2018-09-27 | 2019-01-04 | 中国重汽集团重庆燃油喷射系统有限公司 | A kind of common-rail injector |
| CN110529316A (en) * | 2019-08-22 | 2019-12-03 | 一汽解放汽车有限公司 | A kind of fuel injection valve and engine |
| CN212318195U (en) * | 2020-06-24 | 2021-01-08 | 中国重汽集团重庆燃油喷射系统有限公司 | Common rail oil sprayer with quick switching function |
-
2020
- 2020-06-24 CN CN202010586033.4A patent/CN111535964A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060000453A1 (en) * | 2004-06-30 | 2006-01-05 | C.R.F. Societa Consortile Per Azioni | Servo valve for controlling an internal combustion engine fuel injector |
| DE102011082666A1 (en) * | 2011-09-14 | 2013-03-14 | Robert Bosch Gmbh | Fuel injector, particularly for common-rail-injection system, has nozzle needle, which closes nozzle hole assembly in nozzle body in closed position, where nozzle needle is arranged in high-pressure chamber in nozzle body |
| CN203098110U (en) * | 2013-01-10 | 2013-07-31 | 无锡开普机械有限公司 | Electronic-control fuel injector of injection valve |
| CN103498743A (en) * | 2013-10-23 | 2014-01-08 | 重庆红江机械有限责任公司 | Control valve of high-pressure common rail electric fuel injector |
| CN109139319A (en) * | 2018-09-27 | 2019-01-04 | 中国重汽集团重庆燃油喷射系统有限公司 | A kind of common-rail injector |
| CN110529316A (en) * | 2019-08-22 | 2019-12-03 | 一汽解放汽车有限公司 | A kind of fuel injection valve and engine |
| CN212318195U (en) * | 2020-06-24 | 2021-01-08 | 中国重汽集团重庆燃油喷射系统有限公司 | Common rail oil sprayer with quick switching function |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 401120 No.6 cuining Road, jingkaiyuan, Liangjiang New District, Yubei District, Chongqing Applicant after: Heavy Oil High Tech Electronic Fuel Injection System Co.,Ltd. Address before: 401120 No.6 cuining Road, jingkaiyuan, Liangjiang New District, Yubei District, Chongqing Applicant before: Heavy oil high tech electronic fuel injection system (Chongqing) Co.,Ltd. Address after: 401120 No.6 cuining Road, jingkaiyuan, Liangjiang New District, Yubei District, Chongqing Applicant after: Heavy oil high tech electronic fuel injection system (Chongqing) Co.,Ltd. Address before: 401120 No.6 cuining Road, jingkaiyuan, Liangjiang New District, Yubei District, Chongqing Applicant before: CHONGQING FUEL INJECTION SYSTEM CO., LTD. OF CHINA NATIONAL HEAVY DUTY TRUCK Group Corp. |