CN106768212B - Vehicle overload detection and information transmission device - Google Patents
Vehicle overload detection and information transmission device Download PDFInfo
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- CN106768212B CN106768212B CN201611092472.XA CN201611092472A CN106768212B CN 106768212 B CN106768212 B CN 106768212B CN 201611092472 A CN201611092472 A CN 201611092472A CN 106768212 B CN106768212 B CN 106768212B
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- strain sensor
- vehicle
- information
- spring
- main spring
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
- G01G3/08—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a leaf spring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q9/00—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention provides a vehicle overload detection and information transmission device, which comprises a measurement device, a control device and an information transmission device, wherein the measurement device comprises a main spring, an auxiliary spring, a main spring strain sensor RFID tag, an auxiliary spring strain sensor and an auxiliary spring strain sensor RFID tag; when the vehicle runs, the strain sensor senses the strain of each connecting part and transmits information to the data collector and the ECU controller; and the ECU controller calculates the load born by each spring according to the load-strain calibration curves of the main spring and the auxiliary spring and the load curves of each spring under static and dynamic states, adds the loads born by all the springs to obtain the actual load value of the vehicle and transmits the actual load value to the information transmission device. The invention can accurately measure the actual loading capacity in the whole carriage, has low manufacturing cost and reliable system operation, and can track the loading capacity and transmit corresponding information in the whole transportation process of the vehicle.
Description
Technical Field
The invention relates to a vehicle overload detection and information transmission device, and belongs to the field of automobile detection monitoring equipment.
Background
Along with the development of national economy, the transportation industry is rapidly developed. In order to pursue greater economic benefits, many freight vehicles overrun and overrun. The damage to overrun overload transportation of vehicles is extremely large: firstly, the overload transportation can seriously destroy highway facilities, increase highway maintenance cost and shorten the service life of the highway, so that other highway users are difficult to travel. Investigation shows that the overload weight of the vehicle is increased and the damage to the road surface is increased in geometric progression, the damage to the road by a truck with the overrun of 10 percent is increased by 40 percent, and the damage to the road is equivalent to 16 times of non-overrun vehicle running once when one vehicle with the overrun of two times runs; secondly, road traffic accidents are easily caused by overload of the vehicle, and the vehicle is in an overload transportation state for a long time, so that the braking and maneuvering safety performance of the vehicle is reduced, and the road traffic accident loss is caused or aggravated. The traditional truck weighing method mainly comprises two kinds of static measurement and dynamic measurement. The static measurement is to statically weigh the weight of the vehicle through a fixed electronic wagon balance, and the measurement data are accurate, but the equipment has large structural weight, poor portability, long measurement time and low efficiency. The dynamic measurement mainly adopts an axle weight meter to detect the weight of the vehicle, the axle weight meter is widely applied to a weighing and charging system, the axle weight meter is required to be installed on a road and a special check point is established, the low-speed passing of the automobile is required during the measurement, the price and the installation space requirement of the axle weight meter are limited, and the use place of the equipment is greatly limited. The weighing method has the advantages that the weighing method is very limited in use, firstly, the weighing method is fixed in use, whether the weighing method is a fixed electronic wagon balance or a shaft weight instrument is checked by checking points, once the vehicle leaves, the vehicle cannot be checked when being overloaded again in the transportation process, namely, each vehicle cannot be tracked and monitored in real time, and secondly, the overload vehicle to be checked is unloaded, and is subjected to shunting and freight, so that the time and the cost of a transportation link are increased, and the overload phenomenon of the vehicle is not prevented from the source. Chinese patent CN102490609a discloses a vehicle overload detection system, which comprises a frame, a front bracket, a rear bracket, a leaf spring and an axle, wherein a height sensor is arranged between the axle and the frame for detecting the load capacity of the vehicle, and the patent provides four states of on-off, off-on, on-on, off-off according to the state that a photoelectric coupler receives light signals, which correspond to four load working conditions respectively, and the system is characterized in that the system cannot accurately measure the actual load capacity of the vehicle, and the problem is that the system is overweight only judged according to a single-side sensor when the distribution of the loaded cargoes is uneven. It is therefore necessary to design a new overload detection system for detecting the actual load of a vehicle in a state where the vehicle is started, traveling, etc., and when the rated load is exceeded, alarming the vehicle and transmitting overload information to a road transportation monitoring center.
Disclosure of Invention
Aiming at the defects and shortcomings in the prior art, the invention aims to solve the overload detection problem and the information transmission problem in the vehicle transportation process and ensure the movement, static tracking and detection of the loading capacity of the vehicle in the vehicle transportation process.
In order to achieve the above task, the present invention adopts the following technical solutions:
the utility model provides a vehicle overload detection and information transmission device, includes measuring device, controlling means, information transmission device, its characterized in that: the measuring device comprises a main spring, an auxiliary spring, a main spring strain sensor RFID tag, an auxiliary spring strain sensor and an auxiliary spring strain sensor RFID tag; when the vehicle runs, the strain sensor senses the strain of each connecting part and transmits information to the data acquisition unit, and the data acquisition unit transmits the strain value of each spring to the ECU controller of the control device; and the ECU controller calculates the load born by each spring according to the load-strain calibration curves of the main spring and the auxiliary spring and the load curves of each spring under static and dynamic conditions, adds the loads born by all the springs to obtain the actual load value of the vehicle and transmits the actual load value to the information transmission device, and the mobile phone of the information transmission device sends the actual load information of the vehicle to the remote computer.
The vehicle overload detection and information transmission device is characterized in that the measurement device comprises eight main springs, eight auxiliary springs, four connecting bottom plates, four data acquisition devices, eight U-shaped bolts, nuts, eight frame fixing blocks, eight frame stop blocks, sixteen auxiliary spring strain sensor RFID tags and sixteen auxiliary spring strain sensor RFID tags are arranged at the uppermost position of the main spring strain sensor, the uppermost position of the auxiliary spring strain sensor is close to the position of the main spring strain sensor, and the uppermost position of the auxiliary spring strain sensor is close to the position of the main spring strain sensor.
The vehicle overload detection and information transmission device is characterized in that the main spring strain sensor and the main spring strain sensor RFID tag are manufactured into an integrated sheet shape and can be permanently fixed on the leaf spring by 502 glue.
The vehicle overload detection and information transmission device is characterized in that the load-strain curves of the main spring strain sensor and the auxiliary spring strain sensor are calibrated in advance, and calibration information is stored in an ECU.
The vehicle overload detection and information transmission device is characterized in that the control device consists of an electronic transceiver, an electronic transceiver signal wire and an ECU controller, the electronic transceiver wirelessly receives information of an RFID tag of the auxiliary spring strain sensor and information of an RFID tag of the main spring strain sensor, and the electronic transceiver transmits the information to the ECU controller.
The vehicle overload detection and information transmission device is characterized in that the information transmission device comprises a mobile phone and a remote computer, and the ECU controller transmits vehicle loading information to the remote computer in real time.
Compared with the prior art, the vehicle overload detection and information transmission device has the following beneficial effects: the strain sensors are arranged on the main springs and the auxiliary springs of the frame, so that the actual load capacity in the whole carriage can be accurately measured, the measurement error caused by uneven load capacity distribution is eliminated, the strain sensors of the springs and the RFID labels of the corresponding strain sensors are designed into an integrated sheet, the manual replacement of the mounting positions of the strain sensors can be effectively prevented, and the system can reliably operate; the device adopts the strain sensor, so that the cost of the device is reduced while the detection precision of the system is ensured, the device can detect the load capacity of the vehicle when the ignition switch of the vehicle is turned ON, and the load capacity can be tracked and corresponding information can be transmitted in the whole process of the transportation process of the vehicle. The invention can automatically prevent the vehicle from running when the system of the device is abnormal by combining with the electromagnetic valve of the power line of the fuel injector, ensures the vehicle to run under the monitoring of the device, and sends the loading information in the vehicle transportation process to the remote computer of the control center in real time.
Drawings
Fig. 1 is a front view showing a vehicle overload detecting and information transmitting apparatus according to an embodiment of the present invention.
Fig. 2 is a plan view showing the above embodiment of the present invention.
Fig. 3 is a bottom view showing the above embodiment of the present invention.
Fig. 4 is an enlarged schematic view of the structure at a in fig. 2.
Fig. 5 is an enlarged schematic view of the structure at B in fig. 3.
Fig. 6 is a control system block diagram.
Fig. 7 is a control flow chart.
Reference numerals illustrate.
1. The vehicle frame comprises a vehicle frame body, 2, a main spring, 3, an auxiliary spring, 4, U-shaped bolts, 5, nuts, 6, an axle, 7, a connecting bottom plate, 8, a long rod bolt, 9, a vehicle frame fixing block, 10, a vehicle frame stop block, 11, an auxiliary spring strain sensor RFID tag, 12, an auxiliary spring strain sensor, 13 and an auxiliary spring strain sensor signal wire, 14, a main spring strain sensor RFID tag, 15, a main spring strain sensor, 16, a main spring strain sensor signal wire, 17, a sensor protection box, 18, a data collector, 19, an electronic transceiver, 20, an electronic transceiver signal wire, 21, an ECU controller, 22, a mobile phone, 23 and a remote computer.
Detailed Description
Hereinafter, a vehicle overload detecting and information transmitting apparatus according to the present invention will be described in detail with reference to fig. 1 to 7.
As shown in fig. 1 to 7, the vehicle overload detection and information transmission device is composed of a measuring device, a control device and an information transmission device, wherein the measuring device comprises a frame 1, a main spring 2, an auxiliary spring 3, four U-shaped bolts 4, nuts 5, an axle 6, a connecting bottom plate 7, a long rod bolt 8, a frame fixing block 9, a frame stop 10, an auxiliary spring strain sensor RFID tag 11, an auxiliary spring strain sensor 12, an auxiliary spring strain sensor signal wire 13, a main spring strain sensor RFID tag 14, a main spring strain sensor 15, a main spring strain sensor signal wire 16, a sensor protection box 17, a data acquisition device 18, one frame 1, two axles 6, four main springs 2, auxiliary springs 3, a connecting bottom plate 7, eight data acquisition devices 18, eight U-shaped bolts 4, nuts 5, a long rod bolt 8, a frame fixing block 9, eight frame stop 10, a sensor protection box 17, eight auxiliary spring strain sensor RFID tags 11, an auxiliary spring strain sensor 12, an auxiliary spring strain sensor signal wire 13, an auxiliary spring strain sensor 14, sixteen sensor signal wires 13, a main spring strain sensor 14, an electronic control device and an electronic control device, wherein the electronic signal wire sensor device comprises sixteen electronic signal sensor devices, and electronic signal transceiver devices, each electronic signal sensor device comprises a main spring sensor signal wire 13, an electronic signal sensor device, and a electronic signal sensor device, and an electronic signal controller, and electronic signal controller.
As shown in fig. 1 to 7, a frame 1 is fixed with a frame fixing block 9 and a frame stop 10, a secondary spring 3 is mounted on a main spring 2, a U-shaped bolt 4 passes through the main spring 2, the secondary spring 3 and a connecting bottom plate 7 and is fixed on an axle 6 by nuts 5, a rolling lug of the main spring 2 is placed in a hole of the frame fixing block 9, a long rod pin 8 passes through the frame fixing block 9 and the rolling lug of the main spring 2 and is fixed on the frame 1, when the frame bears a large load, the frame stop 10 moves downwards and presses on the secondary spring 3, a secondary spring strain sensor RFID tag 11 and a secondary spring strain sensor 12 are mounted at the position of the uppermost steel plate spring of the secondary spring 3, which is close to the U-shaped bolt 4, a main spring strain sensor RFID tag 14 and a main spring strain sensor 15 are mounted at the position of the lowermost steel plate spring of the main spring 2, the strain sensor RFID tag and the strain sensor are sleeved in a sensor protection box 17, a secondary spring strain sensor signal wire 13 is connected to the secondary spring strain sensor 12 and a data sensor 18 and an electronic signal acquisition and electronic control unit 21 are connected with the main spring strain sensor 14 and the electronic control unit 20 through the data acquisition sensor and the data sensor signal acquisition and the data sensor 18.
As shown in fig. 1 to 7, the sensor protection box 17 is sleeved outside the auxiliary spring strain sensor 12, the auxiliary spring strain sensor RFID tag 11, the auxiliary spring 3, the main spring 2, the main spring strain sensor 15 and the main spring strain sensor RFID tag 14, and when an automobile runs in rainy days or encounters a muddy road, the auxiliary spring strain sensor 12 and the main spring strain sensor 15 are prevented from being polluted by sundries such as rainwater, sludge and the like, so that the sensors can work normally.
As shown in fig. 1 to 7, the load-strain curves of the main spring strain sensor 15 and the sub-spring strain sensor 12 on the main spring 2 and the sub-spring 3 are calibrated in advance, calibration information is stored in the ECU controller 21, and strain information of each sensor when the vehicle is idling is also stored in the ECU controller 21.
As shown in fig. 1 to 7, the main spring strain sensor 15 and the main spring strain sensor RFID tag 14 are integrated sheets, the auxiliary spring strain sensor 12 and the auxiliary spring strain sensor RFID tag 11 are integrated sheets, and the sheets can be fixed on the leaf spring by 502 glue. The strain sensor and the strain sensor RFID tag are integrated into a thin sheet, so that the sheet is convenient to install, and the thin sheet is permanently adhered to the leaf spring by 502 glue, so that the installation reliability of the device can be improved, and the device is prevented from being moved.
As shown in fig. 1 to 7, the electronic transceiver 19 wirelessly receives information of the sub-spring sensor RFID tag 11 and the main spring strain sensor RFID tag 14, and the electronic transceiver 19 transmits the information to the ECU controller 21.
As shown in fig. 7, an engine speed of logic 1 indicates that the engine has been started with a speed, and a vehicle speed of logic 1 indicates that the vehicle has traveled with a non-zero travel speed.
As shown in fig. 1 to 7, a vehicle overload detection and information transmission device has the following working processes: when the ignition switch of the vehicle is turned ON, the ECU controller detects whether signals of the main spring strain sensor 15 and the auxiliary spring strain sensor 12 are normal, if the detection result is abnormal, the sound alarm and the instrument panel display a problem sensor number, the vehicle overload detection and information transmission device detects the rotating speed and the alarm time of the engine, and if the rotating speed of the engine is logic 1 and the alarm time exceeds 15 minutes, the electromagnetic valve of the power line of the fuel injector is cut off, and the engine is closed; if the ECU controller detects that the signals of the main spring strain sensor 15 and the auxiliary spring strain sensor 12 are normal, the strain signals of the main spring and the auxiliary spring are transmitted to the ECU controller 21 through the main spring strain sensor signal line 16 and the auxiliary spring strain sensor signal line 13, the ECU controller 21 calculates corresponding loads according to load-strain curves calibrated by the sensors and sums the corresponding loads to obtain the actual load capacity of the vehicle, when the detected vehicle speed signal is logic 1, if the actual load capacity does not exceed the rated load, the ECU controller 21 transmits the vehicle load capacity information to the mobile phone 22, the mobile phone 22 transmits the vehicle load capacity information, license plate number, driving mileage, driving time and GPS positioning information to the remote computer 23, the remote computer 23 monitors the vehicle load capacity information, and if the detected actual load capacity exceeds the rated load, the mobile phone 22 transmits the information to the remote computer 23, and then transmits the information every 5 minutes, and simultaneously sounds in the vehicle to alarm.
In order to ensure that the ECU controller 21 can correctly judge that transient overload information is not immediately sent by the mobile phone 22 when the transient overload information is detected at a certain moment, the transient overload information is compared with the average information of the last five measurements, if the information is overload, the signals are true overload signals, otherwise, the signals are false signals, and the signals are removed.
The principles and embodiments of the present invention have been described with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings.
The present invention is not limited to the above-described embodiments, and modifications and improvements within the scope of achieving the object of the present invention are also included in the present invention.
Claims (3)
1. The utility model provides a vehicle overload detection and information transmission device, includes measuring device, controlling means, information transmission device, its characterized in that:
the measuring device comprises a frame, an axle, main springs, auxiliary springs, four U-shaped bolts, nuts, a connecting bottom plate, a long rod bolt, frame fixing blocks, frame check blocks, auxiliary spring strain sensor RFID labels, sixteen auxiliary spring strain sensor signal wires, a main spring strain sensor RFID label, a main spring strain sensor signal wire, a sensor protection box and a data acquisition device, wherein one frame is provided with the two axles, four U-shaped bolts, nuts, long rod bolts, frame fixing blocks, frame check blocks and eight sensor protection boxes are respectively arranged on the main springs, the eight auxiliary spring strain sensor RFID labels, the sixteen auxiliary spring strain sensor signal wires are respectively arranged on the main springs, the auxiliary spring strain sensor RFID labels and the auxiliary spring strain sensor are respectively arranged on the position of the uppermost steel plate spring of the auxiliary springs, the position of the uppermost steel plate spring is close to the main spring, and the position of the auxiliary spring strain sensor is arranged on the main spring steel plate in the position of the uppermost steel plate, and the auxiliary spring strain sensor RFID label is arranged on the position of the uppermost steel plate of the main spring;
the main spring strain sensor and the RFID tag of the main spring strain sensor are manufactured into an integrated sheet shape and can be permanently fixed on the leaf spring by 502 glue;
the information transmission device comprises a mobile phone and a remote computer, and the ECU controller transmits the vehicle loading information to the remote computer;
when the vehicle runs, the strain sensor senses the strain of each connecting part and transmits information to the data acquisition unit, and the data acquisition unit transmits the strain value of each spring to the ECU controller of the control device; the ECU controller calculates the load born by each spring according to the load-strain calibration curve of the main spring, the auxiliary spring and the load curve of each spring under static and dynamic conditions, adds the loads born by all springs to obtain the actual load value of the vehicle and transmits the actual load value to the information transmission device, and the mobile phone of the information transmission device sends the actual load information of the vehicle to the remote computer;
when the ignition switch of the vehicle is turned ON, the ECU controller detects whether signals of the main spring strain sensor and the auxiliary spring strain sensor are normal, if the detection result is abnormal, the sound alarm and the instrument panel display problem sensor numbers, the vehicle overload detection and information transmission device detects the rotating speed and the alarm time of the engine, and if the rotating speed of the engine is logic 1 and the alarm time exceeds 15 minutes, the electromagnetic valve of the power line of the fuel injector is cut off, and the engine is closed; if the ECU controller detects that the signals of the main spring strain sensor and the auxiliary spring strain sensor are normal, the strain signals of the main spring and the auxiliary spring are transmitted to the ECU controller through the signal wire of the main spring strain sensor and the signal wire of the auxiliary spring strain sensor, the ECU controller calculates corresponding loads according to load-strain curves calibrated by the sensors and sums the corresponding loads to obtain actual load capacity of the vehicle, when the detected vehicle speed signal is logic 1, if the actual load capacity does not exceed rated load, the ECU controller transmits the information of the vehicle load capacity to a mobile phone, the mobile phone transmits the information of the vehicle load capacity, license plate number, driving mileage, driving time and GPS positioning information to a remote computer, the remote computer monitors the information, and if the detected actual load capacity exceeds the rated load, the mobile phone transmits the information to the remote computer, then transmits the information once every 5 minutes, and simultaneously sounds alarm inside the vehicle;
in order to ensure that the ECU controller can correctly judge the transient overload signal caused by jolt in the running process of the vehicle, the transient overload signal is not immediately sent by a mobile phone when the transient overload information is detected at a certain moment, but is compared with the average information measured five times recently, if the information is overloaded, the signals are real overload signals, the signals are sent to a remote computer by the mobile phone, otherwise, the signals are false signals, and the information is not sent to the remote computer by the mobile phone.
2. The vehicle overload detection and information transmission apparatus of claim 1, wherein the load-strain curves of the main spring strain sensor and the sub-spring strain sensor are calibrated in advance, and the calibration information is stored in the ECU controller.
3. The vehicle overload detection and information transmission device according to claim 1, wherein the control device comprises an electronic transceiver, an electronic transceiver signal line and an ECU controller, the electronic transceiver wirelessly receives information of the auxiliary spring strain sensor RFID tag and the main spring strain sensor RFID tag, and the electronic transceiver transmits the information to the ECU controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611092472.XA CN106768212B (en) | 2016-12-02 | 2016-12-02 | Vehicle overload detection and information transmission device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611092472.XA CN106768212B (en) | 2016-12-02 | 2016-12-02 | Vehicle overload detection and information transmission device |
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| CN106768212A CN106768212A (en) | 2017-05-31 |
| CN106768212B true CN106768212B (en) | 2023-06-09 |
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| DE102017222962A1 (en) | 2017-12-15 | 2019-06-19 | Zf Friedrichshafen Ag | Control unit with communication device for contactless data exchange and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4215754A (en) * | 1978-11-20 | 1980-08-05 | Structural Instrumentation, Inc. | Load measuring system for leaf spring suspensions |
| CN101659048A (en) * | 2008-08-27 | 2010-03-03 | 旭电机株式会社 | Fastening apparatus and system for detecting axial force thereof |
| WO2012053869A2 (en) * | 2010-10-22 | 2012-04-26 | ㈜바이텍코리아 | Load measuring device and method of weighing vehicle having suspension with two-stage springs |
| CN105788251A (en) * | 2016-03-08 | 2016-07-20 | 山东交通学院 | Truck overload real-time monitoring system based on Beidou Internet-of-vehicles and truck overload real-time monitoring method thereof |
| CN206300710U (en) * | 2016-12-02 | 2017-07-04 | 山东交通学院 | A kind of overload of vehicle detection and information carrying means |
-
2016
- 2016-12-02 CN CN201611092472.XA patent/CN106768212B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4215754A (en) * | 1978-11-20 | 1980-08-05 | Structural Instrumentation, Inc. | Load measuring system for leaf spring suspensions |
| CN101659048A (en) * | 2008-08-27 | 2010-03-03 | 旭电机株式会社 | Fastening apparatus and system for detecting axial force thereof |
| WO2012053869A2 (en) * | 2010-10-22 | 2012-04-26 | ㈜바이텍코리아 | Load measuring device and method of weighing vehicle having suspension with two-stage springs |
| CN105788251A (en) * | 2016-03-08 | 2016-07-20 | 山东交通学院 | Truck overload real-time monitoring system based on Beidou Internet-of-vehicles and truck overload real-time monitoring method thereof |
| CN206300710U (en) * | 2016-12-02 | 2017-07-04 | 山东交通学院 | A kind of overload of vehicle detection and information carrying means |
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Inventor after: Zhou Changfeng Inventor after: Liu Xinlei Inventor after: Yi Fengyan Inventor after: Zhao Guiqing Inventor after: Zhang Kai Inventor after: Liu Jingyi Inventor before: Zhou Changfeng Inventor before: Liu Xinlei Inventor before: Yi Fengyan Inventor before: Zhao Guiqing Inventor before: Zhang Kai Inventor before: Liu Jingyi |