CN106696752A - Method used for controlling DC-to-DC converter - Google Patents
Method used for controlling DC-to-DC converter Download PDFInfo
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- CN106696752A CN106696752A CN201710097219.1A CN201710097219A CN106696752A CN 106696752 A CN106696752 A CN 106696752A CN 201710097219 A CN201710097219 A CN 201710097219A CN 106696752 A CN106696752 A CN 106696752A
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- soc
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2210/00—Converter types
- B60L2210/10—DC to DC converters
- B60L2210/12—Buck converters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/52—Drive Train control parameters related to converters
- B60L2240/527—Voltage
-
- 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
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
-
- 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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a method used for controlling a DC-to-DC converter. The DC-to-DC converter (6) is used for a plug-in hybrid electric vehicle (PHEV). The method combines a high voltage system state, a DC-to-DC fault state, a battery SOC (%), high voltage system discharge power and DC-to-DC consumed power to determine a DC-to-DC working condition. In the case that a whole vehicle system is in different states (a plug-in charging mode and a non-plug-in charging mode), a power system control unit (PCU) gives a control command to allow the DC-to-DC converter to output low voltage values with different levels. The method used for controlling the DC-to-DC converter provided by the invention has the advantages of less parameters and simple logic, and can make a program algorithm more easy. In addition, for different working states of a charger, controlling the DC-to-DC converter to output the low voltage values with the different levels can cause more reasonable use for power and reduce the energy waste.
Description
Technical field
It is more particularly to a kind of for controlling DC-DC to change the present invention relates to plug-in hybrid-power automobile technical field
The method of device.
Background technology
With the exhaustion of renewable resource, for reducing energy consumption, pollution, energy-saving plug-in hybrid-power automobile etc. are reduced
The design and development of new-energy automobile is increasingly paid close attention to by the major automobile manufacturing enterprises in the world.
Used as one of core component in energy-saving new-energy automobile, its major function is by power electric to dc-dc
The high direct voltage in pond is converted into low-voltage dc voltage, is that 12V batteries and low pressure consuming parts are powered.
At present, the control method of dc-dc is applied more ripe during power vehicle is mixed in, but, due in
Mixed power vehicle is needed according to Full Vehicle System operational mode, all multi-parameters of synthesis and condition, such as temperature, electric current, voltage, and therefore
Barrier diagnosis etc., finally controls dc-dc to work, hence in so that the method for control dc-dc is relatively complicated, and
And, being mixed due in dynamical system does not have charger controller, and the control method of its dc-dc is not directly applicable slotting
Electric-type hybrid vehicle.
In sum, a kind of control method of dc-dc how is provided, with suitable for plug-in hybrid vapour
Car, becomes those skilled in the art's technical problem urgently to be resolved hurrily.
The content of the invention
In view of this, the invention provides a kind of method for controlling dc-dc, the dc-dc should
For plug-in hybrid-power automobile, the method can make control program with easier algorithm, and can control DC-DC
Converter provides different grades of low voltage according to actual needs.
In order to achieve the above object, the present invention provides following technical scheme：
A kind of method for controlling dc-dc, the dc-dc is applied to plug-in hybrid vapour
Car, the method includes：
Detected when dynamical system control unit or during any one in being calculated following four inoperative condition, it is described
Dc-dc exports 0V voltages, and four inoperative conditions are, high-pressure system un-activation, dc-dc be faulty,
Battery SOC is less than the arranges values of SOC first, and high-pressure system can discharge power subtract the difference of DC-DC consumption power less than the
One threshold value；
The high-pressure system can discharge power be equal to battery maximum continuous discharge power, motor discharge power and vehicle-mounted charge
Machine charge power is added and value, the DC-DC consumption power is multiplied by DC-DC low-pressure side electric currents equal to DC-DC low-pressure side voltages,
Again divided by the dc-dc operating efficiency quotient；
When the whole during dynamical system control unit is detected and is calculated following four condition of work, vehicle system is detected
Whether system is in plug-in charged state, if it is, dc-dc output first voltage value, if it is not, then described
Dc-dc exports second voltage value, and the second voltage value is more than the first voltage value；
Four conditions of work are, high-pressure system activation, dc-dc fault-free, battery SOC are not less than SOC the
Two arranges values, and the high-pressure system can discharge power subtract the difference of DC-DC consumption power not less than Second Threshold,
The arranges values of the SOC second are more than the arranges values of the SOC first, and the Second Threshold is more than the first threshold.
Preferably, in the above-mentioned methods, the first threshold is 600 watts~650 watts.
Preferably, in the above-mentioned methods, the Second Threshold is 850 watts~900 watts.
Preferably, in the above-mentioned methods, the arranges values of the SOC first are 17%~19%.
Preferably, in the above-mentioned methods, the arranges values of the SOC second are 20%~25%.
Preferably, in the above-mentioned methods, the first voltage value is 12.5V~13.5V.
Preferably, in the above-mentioned methods, the second voltage value is 14.5V~15V.
It can be seen from above-mentioned technical proposal, provided by the present invention in the method for controlling dc-dc, with reference to high pressure
System mode, DC-DC malfunctions, battery SOC (%), high-pressure system can discharge power, and DC-DC consumption power judges
DC-DC working conditions, in the case where Full Vehicle System is in different states (plug-in charge mode, non-plug-in charge mode),
Dynamical system control unit (abbreviation PCU) control command dc-dc exports different grades of low voltage value.Thus may be used
See, the parameter that the method that the present invention is provided is utilized is less, logic is simple, and programmed algorithm can be made easier, moreover, it is contemplated that
Charger controller (judgement of plug-in charge mode), therefore, it is possible to be applied to plug-in hybrid-power automobile.In addition, for charging
The different working condition of machine, control dc-dc exports different grades of low voltage value, and electric energy can be made to obtain more reasonable
Utilization, reduce energy waste.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is a kind of schematic diagram of control system for dc-dc provided in an embodiment of the present invention；
Fig. 2 is a kind of flow chart for controlling the method for dc-dc provided in an embodiment of the present invention.
Marked in figure：
1st, dynamical system control unit；2nd, battery controller；3rd, electrokinetic cell；4th, Vehicular charger；5th, electric machine controller；
6th, dc-dc；7th, CAN lines；8th, high-voltage wiring harness；9th, rigid line.
Specific embodiment
In order to make it easy to understand, the invention will be further described below in conjunction with the accompanying drawings.
It is a kind of schematic diagram of control system for dc-dc provided in an embodiment of the present invention referring to Fig. 1, moves
Force system control unit 1, battery controller 2, Vehicular charger 4, electric machine controller 5, and dc-dc pass through CAN lines 7
CAN communication network is constituted, collection or transmission control command signal etc. can be interacted；
Electrokinetic cell 3, Vehicular charger 4, electric machine controller 5, and dc-dc constitute height by high-voltage wiring harness 8
Push back road；
Battery controller 2 is connected by rigid line 9 with electrokinetic cell 3, can gather the coherent signal of electrokinetic cell 3, rigid line 9
It is the wire of analog signal input/output.
The invention provides a kind of method for controlling dc-dc, dc-dc 6 is applied to plug-in mixed
Power vehicle is closed, the method includes：
(1) when dynamical system control unit 1 detects or be calculated any one in following four inoperative condition,
Dc-dc 6 exports 0V voltages.
Four inoperative conditions are：
A. high-pressure system un-activation；
B.DC-DC converters 6 are faulty；
C. battery SOC is less than the arranges values of SOC first；And
D. high-pressure system can discharge power subtract DC-DC consumption power difference be less than first threshold.
(2) when dynamical system control unit 1 detects and be calculated the whole in following four condition of work, detect whole
Whether car system is in plug-in charged state, if it is, the output first voltage value of dc-dc 6, if it is not, then DC-DC
Converter 6 exports second voltage value, and second voltage value is more than first voltage value.
Four conditions of work are：
E. high-pressure system activation；
The fault-free of f.DC-DC converters 6；
G. battery SOC is not less than the arranges values of SOC second；And
H. high-pressure system can discharge power subtract the difference of DC-DC consumption power not less than Second Threshold, SOC second is set
Value is more than the arranges values of SOC first, and Second Threshold is more than first threshold.
Wherein, high-pressure system can discharge power be equal to battery maximum continuous discharge power, motor discharge power and vehicle-mounted fill
Motor charge power is added and value；
DC-DC consumption power is multiplied by DC-DC low-pressure side electric currents equal to DC-DC low-pressure side voltages, then divided by dc-dc
The quotient of 6 operating efficiency.
In actual applications, first threshold can be 600 watts~650 watts, and Second Threshold can be 850 watts~900 watts；
The arranges values of SOC first can be able to be 20%~25% for the arranges values of 17%~19%, SOC second；First voltage value can be
12.5V~13.5V, second voltage value can be 14.5V~15V.
It is a kind of flow chart for controlling the method for dc-dc provided in an embodiment of the present invention referring to Fig. 2, tool
Body flow includes：
S1, calculates battery maximum continuous discharge power, electric system discharge power and Vehicular charger charge power, and phase
Plus obtain high-pressure system can discharge power.
Motor actual DC voltage is multiplied by motor actual DC electric current and obtains electric system discharge power；
Charger real time charging voltage is multiplied by charger real time charging electric current and obtains charger charge power.
S2, calculates DC-DC consumption power.
S3, judges high-pressure system state；Judge DC-DC malfunctions；Judge battery SOC (%)；Multilevel iudge high pressure system
System can discharge power and DC-DC consumption power.
High-pressure system state includes initialization, high pressure normally and high voltage fault, wherein, initialization and high pressure are normally activation
State, high voltage fault is unactivated state；
Battery SOC refers to battery dump energy percentage, and " judgement battery SOC " refers to judge whether the percentage is less than
The arranges values of SOC first, such as 17%, or, judge the percentage whether not less than the arranges values of SOC second, such as 20%.
" multilevel iudge high-pressure system can discharge power and DC-DC consumption power " refers to calculate high-pressure system to discharge work(
Whether rate subtracts the difference that DC-DC consumes power, then judges the difference less than first threshold, such as 600 watts, or, judging should
Whether difference is not less than Second Threshold, such as 850 watts.
If high-pressure system state is unactivated state or DC-DC is in malfunction or battery SOC less than 17% or high
Pressure system can discharge power subtract the difference of DC-DC consumption power less than 600 watts, then into step S4；
If high-pressure system state is state of activation and DC-DC be in unfaulty conditions and battery SOC not less than 20% and
High-pressure system can discharge power subtract the difference of DC-DC consumption power not less than 850 watts, then into step S5.
S4, dynamical system control unit judges that DC-DC is in non-operating mode, and sends control command, changes DC-DC
Device exports 0V.
S5, dynamical system control unit judges that DC-DC is in mode of operation, and judges Full Vehicle System pattern.
Whether " judging Full Vehicle System pattern " refers to judge Full Vehicle System in plug-in charge mode.
If Full Vehicle System is in plug-in charge mode, into step S6；
If Full Vehicle System is in non-plug-in charge mode, into step S7.
S6, dynamical system control unit sends control command, dc-dc is exported 12.5V.
S7, dynamical system control unit sends control command, dc-dc is exported 14.5V.
Provided by the present invention in the method for controlling dc-dc, with reference to high-pressure system state, DC-DC failure shapes
State, battery SOC (%), high-pressure system can discharge power, and DC-DC consumption power judges DC-DC working conditions, in vehicle
In the case that system is in different states (plug-in charge mode, non-plug-in charge mode), dynamical system control unit is (referred to as
PCU) control command dc-dc exports different grades of low voltage value.As can be seen here, the method that the present invention is provided is utilized
Parameter it is less, logic is simple, programmed algorithm can be made easier, moreover, it is contemplated that charger controller (plug-in charging mould
Formula judges), therefore, it is possible to be applied to plug-in hybrid-power automobile.In addition, for the different working condition of charger, control
Dc-dc exports different grades of low voltage value, and electric energy can be made to get the more reasonable use, and reduces energy waste.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or uses the present invention.
Various modifications to embodiment will be apparent for those skilled in the art, as defined herein general
Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention will not
Can be restricted to embodiment illustrated herein, and be to fit to consistent with principles disclosed herein and features of novelty most wide
Scope.
Claims (7)
1. a kind of method for controlling dc-dc, the dc-dc (6) is applied to plug-in hybrid vapour
Car, it is characterised in that the method includes：
Detected when dynamical system control unit (1) or during any one in being calculated following four inoperative condition, it is described
Dc-dc (6) exports 0V voltages, and four inoperative conditions are that high-pressure system un-activation, dc-dc (6) have
Failure, battery SOC be less than the arranges values of SOC first, and high-pressure system can discharge power subtract DC-DC consumption power difference it is small
In first threshold；
The high-pressure system can discharge power be equal to battery maximum continuous discharge power, motor discharge power and Vehicular charger and fill
Electrical power is added and value, the DC-DC consumption power is multiplied by DC-DC low-pressure side electric currents equal to DC-DC low-pressure side voltages, then removes
With the quotient of the operating efficiency of the dc-dc (6)；
When the whole during dynamical system control unit (1) is detected and is calculated following four condition of work, vehicle system is detected
Whether system is in plug-in charged state, if it is, the dc-dc (6) output first voltage value, if it is not, then institute
Dc-dc (6) output second voltage value is stated, the second voltage value is more than the first voltage value；
Four conditions of work are that high-pressure system activation, dc-dc (6) fault-free, battery SOC are not less than SOC second
Arranges value, and the high-pressure system can discharge power subtract the difference of DC-DC consumption power not less than Second Threshold, institute
The arranges values of SOC second are stated more than the arranges values of the SOC first, the Second Threshold is more than the first threshold.
2. method according to claim 1, it is characterised in that the first threshold is 600 watts~650 watts.
3. method according to claim 2, it is characterised in that the Second Threshold is 850 watts~900 watts.
4. method according to claim 1, it is characterised in that the arranges values of the SOC first are 17%~19%.
5. method according to claim 4, it is characterised in that the arranges values of the SOC second are 20%~25%.
6. method according to claim 1, it is characterised in that the first voltage value is 12.5V~13.5V.
7. method according to claim 6, it is characterised in that the second voltage value is 14.5V~15V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710097219.1A CN106696752B (en) | 2017-02-22 | 2017-02-22 | A method of for controlling DC-DC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710097219.1A CN106696752B (en) | 2017-02-22 | 2017-02-22 | A method of for controlling DC-DC converter |
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| Publication Number | Publication Date |
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| CN106696752A true CN106696752A (en) | 2017-05-24 |
| CN106696752B CN106696752B (en) | 2019-02-19 |
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ID=58917124
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710097219.1A Active CN106696752B (en) | 2017-02-22 | 2017-02-22 | A method of for controlling DC-DC converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107472030A (en) * | 2017-06-09 | 2017-12-15 | 宝沃汽车（中国）有限公司 | Control method, system and the vehicle of electric automobile |
| CN109895631A (en) * | 2019-02-27 | 2019-06-18 | 重庆长安新能源汽车科技有限公司 | Intelligent double-power management method, system and the computer readable storage medium of new-energy automobile |
| CN113665499A (en) * | 2021-08-31 | 2021-11-19 | 中国第一汽车股份有限公司 | Electric automobile energy management system and control method |
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| CN105667330A (en) * | 2016-01-11 | 2016-06-15 | 潍柴动力股份有限公司 | Control method and system for DCDC (direct current direct current) |
| CN105730272A (en) * | 2016-02-04 | 2016-07-06 | 中国第一汽车股份有限公司 | Control method for low-voltage power source management system of new-energy vehicle |
| CN106042964A (en) * | 2016-06-27 | 2016-10-26 | 北京新能源汽车股份有限公司 | Electric automobile low-voltage storage battery control method and device and electric automobile |
| US20170021737A1 (en) * | 2015-07-21 | 2017-01-26 | Hyundai Motor Company | Method and apparatus of controlling output voltage of dc converter for vehicle including driving motor |
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| CN101604855A (en) * | 2009-05-08 | 2009-12-16 | 奇瑞汽车股份有限公司 | A kind of pure electric automobile DC-DC converter enable control method |
| US20170021737A1 (en) * | 2015-07-21 | 2017-01-26 | Hyundai Motor Company | Method and apparatus of controlling output voltage of dc converter for vehicle including driving motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107472030A (en) * | 2017-06-09 | 2017-12-15 | 宝沃汽车（中国）有限公司 | Control method, system and the vehicle of electric automobile |
| CN107472030B (en) * | 2017-06-09 | 2020-07-24 | 北汽福田汽车股份有限公司 | Control method and system of electric automobile and vehicle |
| CN109895631A (en) * | 2019-02-27 | 2019-06-18 | 重庆长安新能源汽车科技有限公司 | Intelligent double-power management method, system and the computer readable storage medium of new-energy automobile |
| CN113665499A (en) * | 2021-08-31 | 2021-11-19 | 中国第一汽车股份有限公司 | Electric automobile energy management system and control method |
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| CN106696752B (en) | 2019-02-19 |
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Effective date of registration: 20200109 Address after: 400023, No. 260, Jianxin East Road, Jiangbei District, Chongqing Patentee after: Chongqing Chang'an Automobile Co., Ltd. Address before: 400023, No. 260, Jianxin East Road, Jiangbei District, Chongqing Co-patentee before: Chongqing Chang'an New Energy Automobile Co., Ltd. Patentee before: Chongqing Chang'an Automobile Co., Ltd. |