CN111648868B - Bucket type idle air quantity automatic regulating device for gasoline engine electric spray system - Google Patents
Bucket type idle air quantity automatic regulating device for gasoline engine electric spray system Download PDFInfo
- Publication number
- CN111648868B CN111648868B CN202010669834.7A CN202010669834A CN111648868B CN 111648868 B CN111648868 B CN 111648868B CN 202010669834 A CN202010669834 A CN 202010669834A CN 111648868 B CN111648868 B CN 111648868B
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- displacement
- air inflow
- adjusting mechanism
- ecu
- control unit
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 11
- 239000007921 spray Substances 0.000 title description 3
- 238000006073 displacement reaction Methods 0.000 claims abstract description 58
- 238000012806 monitoring device Methods 0.000 claims abstract description 15
- 238000002347 injection Methods 0.000 claims abstract description 13
- 239000007924 injection Substances 0.000 claims abstract description 13
- 239000000446 fuel Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 abstract description 9
- 230000033001 locomotion Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
- F02D2009/0201—Arrangements; Control features; Details thereof
- F02D2009/0213—Electronic or electric governor
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
The invention discloses a bucket type idle air quantity automatic regulating device for a gasoline engine electronic injection system, which comprises a throttle body, an air inflow regulating mechanism, a displacement executing device, an Electronic Control Unit (ECU) and an accelerator cable, wherein the throttle body is provided with a throttle valve; the throttle body is provided with an air passage and a guide mounting hole, the air inflow adjusting mechanism is arranged in the guide hole, the displacement executing device is arranged at the lower part of the throttle body, and the throttle body is also provided with a displacement monitoring device; an Electronic Control Unit (ECU) is arranged on the throttle body and is in circuit connection with the displacement monitoring device; the throttle cable is connected with the air inflow adjusting mechanism and can control the air inflow adjusting mechanism to move up and down, the air inflow adjusting mechanism can drive the displacement monitoring device to link up, and the Electronic Control Unit (ECU) can control the displacement executing device to execute work. The system can more accurately adjust the air inflow according to the idle state, and the reliability of the whole system is improved; is convenient for installation and use and popularization and use.
Description
Technical Field
The invention relates to a gasoline electro-mechanical spraying system, in particular to a bucket type idling air quantity automatic regulating device for the gasoline electro-mechanical spraying system, which is applied to a device for regulating the idling air inflow of an engine in an electro-mechanical spraying system of a small gasoline engine.
Background
The electric control fuel injection system of the gasoline engine is called an electric injection system for short and is responsible for the management of the air inflow, the fuel injection and the ignition of the engine. The idling air inflow control is one of the contents, and for the gasoline electromechanical injection system for the car, the electronic throttle body technology is mostly adopted at present, namely, a servo motor is utilized to directly drive the rotation of a throttle body valve plate through a toothed belt or a gear, so that the air inflow of idling and other working conditions is controlled. For the current small-sized petrol engine electric spray system, because of cost limitation, the electric control regulator of idle speed air quantity adopts an electric control idle speed valve proposal, mainly uses the rotary motion of a stepping motor to control the motion of a valve core, thereby changing the flow area of a valve hole and achieving the purpose of regulating the idle speed air inflow.
The main disadvantage of this solution is: the method belongs to an open-loop regulation scheme, the actual execution effect of an idle valve is calculated completely by means of the stepping angle of a stepping motor, when the stepping motor loses steps or is blocked, an electric control system cannot sense, on one hand, fuel concentration control deviates from an ideal range to cause emission deterioration, on the other hand, when an air inlet channel is blocked, a near-term gap stop occurs, and at the moment, an engine cannot be started due to too large or too small air inlet gap; the existing idle speed adjusting structure is specially provided with an idle speed air inlet channel on the throttle body for installation, so that the throttle body is large in size, inconvenient to install and even limited.
Disclosure of Invention
The invention provides a bucket type idle air quantity automatic regulating device for a gasoline engine electric injection system, which solves the technical problems and comprises a throttle body, an air inflow regulating mechanism, a displacement executing device, an Electronic Control Unit (ECU) and an accelerator cable; the throttle valve body is provided with an air passage and a guide mounting hole which is vertically intersected with the air passage, the air inflow adjusting mechanism is arranged in the guide hole, the displacement executing device is arranged at the lower part of the throttle valve body and can keep contact with the air inflow adjusting mechanism to enable the air inflow adjusting mechanism to displace up and down, and the throttle valve body is also provided with a displacement monitoring device; the Electronic Control Unit (ECU) is arranged on the throttle body and is in circuit connection with the displacement monitoring device; the throttle cable is connected with the air inflow adjusting mechanism and can control the air inflow adjusting mechanism to move up and down, and the air inflow adjusting mechanism can drive the displacement monitoring device to link up by the up and down displacement, so that the displacement information of the displacement monitoring device is fed back to the Electronic Control Unit (ECU), and the Electronic Control Unit (ECU) can control the displacement executing device to execute work; the displacement executing device and the accelerator cable have equal control function on the air inflow adjusting mechanism.
The air inflow adjusting mechanism comprises a hanging barrel, a reset spring and a fixed cover, wherein the fixed cover fixedly installs all parts of the air inflow adjusting mechanism in a guide mounting hole, an accelerator pull rope is connected with the hanging barrel and is controlled to displace up and down, and two ends of the reset spring are respectively abutted against the fixed cover and the hanging barrel, so that the hanging barrel is kept in contact with a displacement executing device under the state that the accelerator pull rope is in a release state.
The displacement monitoring device comprises a gear shaft, a magnet arranged at the end part of the gear shaft, an angle sensor which is arranged in an Electronic Control Unit (ECU) and corresponds to the position of the magnet, and a rack arranged on the circumferential surface of the bucket; the gear shaft is matched and clamped with the rack on the bucket, so that the linear displacement of the bucket is converted into rotary displacement of the gear shaft, and an angle sensor senses an angle displacement signal of the magnet at the end part of the gear shaft and feeds the angle displacement signal back to an Electronic Control Unit (ECU).
The displacement executing device comprises a motor, a pressing plate and a push rod arranged in the motor, wherein the motor consists of a shell, a stator assembly and a push rod sleeve, the push rod sleeve is also a rotor of the motor, correspondingly matched spiral threads are arranged between the push rod sleeve and the push rod and are connected and rotated through the spiral threads, the push rod keeps contact with the lower end part of the air inflow adjusting mechanism, the push rod sleeve rotates to enable the push rod to vertically displace, so that the lifting bucket in the contact air inflow adjusting mechanism vertically displaces, and the displacement executing device is fixedly installed with the throttle body through a screw for the pressing plate.
The Electronic Control Unit (ECU) comprises a base, a seat cover and a circuit board arranged inside, wherein the angle sensor is arranged at a position corresponding to the magnet at the end part of the gear shaft on the circuit board, and the Electronic Control Unit (ECU) is fixedly installed with the throttle body through a screw for the base.
The positioning table is arranged in the guide mounting hole of the throttle body, the positioning table is provided with a positioning hole, the ejector rod passes through the positioning hole to be propped against the lower end part of the bucket, and the ejector rod is provided with a positioning step which can form propping with the lower end surface of the positioning table.
The motor is a stepping motor.
The motor is a direct current motor.
By adopting the technical scheme, the invention has the following beneficial effects:
In the invention, when the engine is in an idle state, the throttle cable loses the involvement effect on the air inflow adjusting mechanism, and at the moment, the linear displacement device can directly control the upper and lower positions of the air inflow adjusting mechanism, so that the air inflow of an air passage is adjusted, and meanwhile, the synchronous rotation of the gear shaft and the air inflow mechanism is fed back to an Electronic Control Unit (ECU), so that the air inflow adjusting effect is detected; the system can more accurately adjust the air inflow according to the idle state, and the reliability of the whole system is improved.
The invention does not need to additionally arrange an idle air inlet channel for component installation, thereby reducing the volume of the throttle body, being more convenient in assembly and installation, on the other hand, reducing the volume, reducing the installation occupation space, being convenient for the adaptation and installation of various vehicle types, and the mechanism does not bring about the improvement of cost.
Drawings
FIG. 1 is an exploded view of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
fig. 3 is a perspective view of the present invention.
Detailed Description
The invention is further elucidated with reference to the drawings.
Referring to fig. 1 to 3, the present invention provides a bucket type idle air amount automatic adjusting device for a gasoline engine electric injection system, comprising a throttle body 1, an air intake amount adjusting mechanism 2 installed in the throttle body 1, a displacement executing device 3 arranged at the lower part of the throttle body 1, an Electronic Control Unit (ECU) 4 installed on the throttle body 1, and an accelerator cable 5 connected with the air intake amount adjusting mechanism 2; the throttle body 1 is provided with an air passage 6 and a guide mounting hole 7 which is perpendicularly intersected with the air passage 6, and the throttle body 1 is also provided with a displacement monitoring device 1-1.
The air inflow adjusting mechanism 2 is installed in the guide installation hole 7, the air inflow adjusting mechanism 2 comprises a bucket 8, a reset spring 9 and a fixed cover 10, the fixed cover 10 fixedly installs all parts in the guide installation hole 7, the bucket 8 is matched in the guide installation hole 7, the throttle cable 5 is connected with the bucket 8, the bucket 8 can be pulled to be compressed and reset to move up and down, the size of a gap formed by the air channel 6 in an engine running state is controlled through the up-down moving distance of the bucket 8, one end of the reset spring 9 abuts against the fixed cover 10, and the other end abuts against the bucket 8, so that the bucket 8 is kept in contact with the displacement actuating device 3 at the lower position under the loosening state of the throttle cable 5.
The displacement monitoring device 1-1 comprises a gear shaft 19, a magnet 20 arranged at the end part of the gear shaft 19, an angle sensor (not labeled in the figure) which is arranged in an Electronic Control Unit (ECU) 4 and corresponds to the position of the magnet 20, and a rack 17 arranged on the circumferential surface of the bucket 8, wherein a gear shaft hole 18 for installing the gear shaft 19 is arranged on the throttle body 1; the gear shaft 19 passes through the gear shaft hole 18 to be matched and clamped with the rack 17 on the bucket 8, and synchronous motion is kept between the gear shaft hole and the rack 17, so that linear displacement of the bucket 8 is converted into rotary displacement of the gear shaft 19, and an angle sensor senses an angle displacement signal of the magnet 20 at the end part of the gear shaft 19 and feeds the angle displacement signal back to an Electronic Control Unit (ECU) 4.
The displacement executing device 3 comprises a motor 11, a pressing plate 12 and a push rod 13 arranged in the motor 11, wherein the motor 11 can consider a stepping motor or a direct current motor according to the use requirement, the motor 11 consists of a shell 14, a stator assembly 15 and a push rod sleeve 16, the push rod sleeve 16 is also a rotor of the motor 11, correspondingly matched spiral threads are arranged between the push rod sleeve 16 and the push rod 13 and are connected and rotated through the spiral threads, the push rod 13 keeps contact with the lower end part of the bucket 8 in the air inflow adjusting mechanism 2, the rotor of the motor 11, namely the push rod sleeve 16, rotates to drive the push rod 13 to rotate to displace up and down, so that the push rod 13 pushes the bucket 8 in the air inflow adjusting mechanism 2 to displace up and down, and the size of an opened gap in an idle state is controlled through the distance of the up-down movement of the bucket 8; the displacement actuator 3 is fixedly mounted with the throttle body 1 by screws through the pressing plate 12 of the displacement actuator 3, so that the whole device is fixedly formed with the throttle body, and the displacement actuator 3 and the throttle cable 5 have equal control effects on the air inflow adjusting mechanism 2.
The Electronic Control Unit (ECU) 4 comprises a base 21, a seat cover 22 and a circuit board 23 arranged inside, the angle sensor is arranged on the circuit board 23 and corresponds to the position of the magnet 20 at the end part of the gear shaft 19, the magnet 20 rotates along with the gear shaft 19, and the angle sensor feeds back the angle sensed by the rotation of the magnet to the Electronic Control Unit (ECU) 4, so that the system calculates the displacement of the bucket 8 up and down and the position in the guide mounting hole 7; an Electronic Control Unit (ECU) 4 is fixedly mounted with the throttle body 1 by screws through its base 21.
A positioning table 24 is arranged in the guide mounting hole 7 of the throttle body 1, a positioning hole 25 is arranged on the positioning table 24, the ejector rod 13 passes through the positioning hole 25 to be propped against the lower end surface of the bucket 8, and the ejector rod 13 is provided with a positioning step 26 which can form propping with the positioning table 24; thereby the displacement actuating device 3 has the maximum limit to the displacement generated by the bucket in the air inflow adjusting mechanism 2, and the use safety is ensured.
In the normal running process of the engine, the throttle cable 5 is used for controlling the lifting bucket 8 in the air inflow adjusting mechanism 2 to move up and down, so that the air inflow in the running state is controlled by controlling the opening gap of the air passage 6, in the process, the gear shaft 19 synchronously rotates along with the movement of the lifting bucket 8 and enables the magnet 20 to rotate, the rotating angle of the magnet 20 is sensed and fed back to the Electronic Control Unit (ECU) 4 through the angle sensor on the circuit board 23, and the system can detect the air inflow in the running state;
In the idle state of the engine, the throttle cable 5 is in a loosening state, the lower end part of the bucket 8 is kept in contact with the ejector rod 13 by the reset spring 9, the motor 11 operates to enable the ejector rod 13 to move up and down through the ejector rod sleeve 16 of the motor, and then the bucket 8 moves up and down, so that the size of an opening gap of the air passage 6 is controlled, the air inflow is controlled in the idle state, in the process, the gear shaft 19 also synchronously rotates along with the movement of the bucket 8, and the rotating angle of the magnet 20 is fed back to the Electronic Control Unit (ECU) 4 through the induction of the angle sensor on the circuit board 23, so that the size of the air inflow in the idle state can be detected; meanwhile, the Electronic Control Unit (ECU) 4 can also detect the rotating speed of the engine in an idle state, the motor 11 can be controlled according to the rotating speed of the engine, the ejector rod 13 is adjusted to a proper position through the ejector rod sleeve 16 in the motor 11, and then the bucket 8 is controlled to displace up and down, the air inflow is adjusted, so that the engine idle speed can be detected and adjusted, and the use stability is improved.
The invention is described in detail by the bucket type idle air amount automatic regulating device for the gasoline engine electric injection system, and the specific examples are applied to illustrate the principle and the implementation of the invention, and the description of the above examples is only used for helping to understand the technical scheme disclosed by the invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (5)
1. A bucket formula idle air volume automatic regulating apparatus for on petrol engine electronic fuel injection system, its characterized in that: comprises a throttle body, an air inflow adjusting mechanism, a displacement executing device, an Electronic Control Unit (ECU) and an accelerator cable; the throttle valve body is provided with an air passage and a guide mounting hole which is vertically intersected with the air passage, the air inflow adjusting mechanism is arranged in the guide hole, the displacement executing device is arranged at the lower part of the throttle valve body and can keep contact with the air inflow adjusting mechanism to enable the air inflow adjusting mechanism to displace up and down, and the throttle valve body is also provided with a displacement monitoring device; the Electronic Control Unit (ECU) is arranged on the throttle body and is in circuit connection with the displacement monitoring device; the throttle cable is connected with the air inflow adjusting mechanism and can control the air inflow adjusting mechanism to move up and down, and the air inflow adjusting mechanism can drive the displacement monitoring device to link up by the up and down displacement, so that the displacement information of the displacement monitoring device is fed back to the Electronic Control Unit (ECU), and the Electronic Control Unit (ECU) can control the displacement executing device to execute work; the displacement executing device and the accelerator cable have equal control function on the air inflow adjusting mechanism;
The air inflow adjusting mechanism comprises a hanging barrel, a reset spring and a fixed cover, wherein the fixed cover fixedly installs all parts of the air inflow adjusting mechanism in the guide mounting hole, the throttle cable is connected with the hanging barrel and is controlled to displace up and down, and two ends of the reset spring are respectively abutted against the fixed cover and the hanging barrel, so that the hanging barrel is kept in contact with the displacement executing device under the state that the throttle cable is in a release state;
the displacement monitoring device comprises a gear shaft, a magnet arranged at the end part of the gear shaft, an angle sensor which is arranged in an Electronic Control Unit (ECU) and corresponds to the position of the magnet, and a rack arranged on the circumferential surface of the bucket; the gear shaft is matched and clamped with a rack on the bucket, so that the linear displacement of the bucket is converted into rotary displacement of the gear shaft, and an angle sensor senses an angle displacement signal of a magnet at the end part of the gear shaft and feeds the angle displacement signal back to an Electronic Control Unit (ECU);
The displacement executing device comprises a motor, a pressing plate and a push rod arranged in the motor, wherein the motor consists of a shell, a stator assembly and a push rod sleeve, the push rod sleeve is also a rotor of the motor, correspondingly matched spiral threads are arranged between the push rod sleeve and the push rod and are connected and rotated through the spiral threads, the push rod keeps contact with the lower end part of the air inflow adjusting mechanism, the push rod sleeve rotates to enable the push rod to vertically displace, so that the lifting bucket in the contact air inflow adjusting mechanism vertically displaces, and the displacement executing device is fixedly installed with the throttle body through a screw for the pressing plate.
2. The automatic bucket type idle gas amount adjusting device for a gasoline engine electronic injection system according to claim 1, wherein: the Electronic Control Unit (ECU) comprises a base, a seat cover and a circuit board arranged inside, wherein the angle sensor is arranged at a position corresponding to the magnet at the end part of the gear shaft on the circuit board, and the Electronic Control Unit (ECU) is fixedly installed with the throttle body through a screw for the base.
3. The automatic bucket type idle gas amount adjusting device for a gasoline engine electronic injection system according to claim 1, wherein: the positioning table is arranged in the guide mounting hole of the throttle body, the positioning table is provided with a positioning hole, the ejector rod passes through the positioning hole to be propped against the lower end part of the bucket, and the ejector rod is provided with a positioning step which can form propping with the lower end surface of the positioning table.
4. The automatic bucket type idle gas amount adjusting device for a gasoline engine electronic injection system according to claim 1, wherein: the motor is a stepping motor.
5. The automatic bucket type idle gas amount adjusting device for a gasoline engine electronic injection system according to claim 1, wherein: the motor is a direct current motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010669834.7A CN111648868B (en) | 2020-07-13 | 2020-07-13 | Bucket type idle air quantity automatic regulating device for gasoline engine electric spray system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010669834.7A CN111648868B (en) | 2020-07-13 | 2020-07-13 | Bucket type idle air quantity automatic regulating device for gasoline engine electric spray system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111648868A CN111648868A (en) | 2020-09-11 |
| CN111648868B true CN111648868B (en) | 2024-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010669834.7A Active CN111648868B (en) | 2020-07-13 | 2020-07-13 | Bucket type idle air quantity automatic regulating device for gasoline engine electric spray system |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113090395A (en) * | 2021-04-28 | 2021-07-09 | 瑞安市鸿科信德电气有限公司 | Electronic throttle valve body assembly |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09256874A (en) * | 1996-03-21 | 1997-09-30 | Aisan Ind Co Ltd | Throttle valve control device for internal combustion engine |
| JP2004092657A (en) * | 2003-11-06 | 2004-03-25 | Keihin Corp | Intake air flow controller for engine |
| CN1587667A (en) * | 2004-09-20 | 2005-03-02 | 汪峰 | Electronic air throttle valve |
| CN203022891U (en) * | 2012-11-28 | 2013-06-26 | 昌辉汽车电器（黄山）股份公司 | Diaphragm plate type idle speed control valve |
| CN104912671A (en) * | 2014-03-13 | 2015-09-16 | 浙江朗杰电子有限公司 | Throttle body |
| CN212359961U (en) * | 2020-07-13 | 2021-01-15 | 江门赛力孚电子科技有限公司 | Bucket type idling air quantity automatic regulating device for gasoline engine electric injection system |
-
2020
- 2020-07-13 CN CN202010669834.7A patent/CN111648868B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09256874A (en) * | 1996-03-21 | 1997-09-30 | Aisan Ind Co Ltd | Throttle valve control device for internal combustion engine |
| JP2004092657A (en) * | 2003-11-06 | 2004-03-25 | Keihin Corp | Intake air flow controller for engine |
| CN1587667A (en) * | 2004-09-20 | 2005-03-02 | 汪峰 | Electronic air throttle valve |
| CN203022891U (en) * | 2012-11-28 | 2013-06-26 | 昌辉汽车电器（黄山）股份公司 | Diaphragm plate type idle speed control valve |
| CN104912671A (en) * | 2014-03-13 | 2015-09-16 | 浙江朗杰电子有限公司 | Throttle body |
| CN212359961U (en) * | 2020-07-13 | 2021-01-15 | 江门赛力孚电子科技有限公司 | Bucket type idling air quantity automatic regulating device for gasoline engine electric injection system |
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| CN111648868A (en) | 2020-09-11 |
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Effective date of registration: 20240819 Address after: 318050, next to the Chayuanling Tunnel on National Highway 104 in Liuxian Village, Yongfeng Town, Linhai City, Taizhou City, Zhejiang Province Patentee after: ZHEJIANG LANG JIE ELECTRONIC Co.,Ltd. Country or region after: China Address before: 529101 5th floor, block 2, No.8, Yingang Avenue, Huicheng, Xinhui District, Jiangmen City, Guangdong Province Patentee before: Jiangmen SELEF Electronic Technology Co.,Ltd. Country or region before: China |
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