CN104890667B - A kind of hybrid electric vehicle engine fast startup procedure - Google Patents
A kind of hybrid electric vehicle engine fast startup procedure Download PDFInfo
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- CN104890667B CN104890667B CN201510220370.0A CN201510220370A CN104890667B CN 104890667 B CN104890667 B CN 104890667B CN 201510220370 A CN201510220370 A CN 201510220370A CN 104890667 B CN104890667 B CN 104890667B
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 235000013399 edible fruits Nutrition 0.000 claims 1
- 239000006096 absorbing agent Substances 0.000 abstract description 9
- 238000005461 lubrication Methods 0.000 abstract description 5
- 239000010705 motor oil Substances 0.000 abstract description 3
- 238000004378 air conditioning Methods 0.000 description 5
- 238000004146 energy storage Methods 0.000 description 4
- 230000008450 motivation Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 3
- 238000005183 dynamical system Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/18—Propelling the vehicle
- B60W30/18009—Propelling the vehicle related to particular drive situations
- B60W30/18018—Start-stop drive, e.g. in a traffic jam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/06—Combustion engines, Gas turbines
- B60W2710/0644—Engine speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/06—Combustion engines, Gas turbines
- B60W2710/0666—Engine torque
-
- 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
- Y02T10/62—Hybrid vehicles
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Hybrid Electric Vehicles (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
Abstract
The present invention relates to a kind of hybrid electric vehicle engine fast startup procedure, applies driving torque T to engine, the rotating speed n of engine is gradually increased, as the rotating speed n=n3 of engine, n3 is a setting speed, and T is gradually reduced.When the rotating speed of engine reaches certain value, control and be gradually reduced to the driving torque of engine, effectively alleviate the impact to torsion vibration absorber；And due to certain starting time, engine is not only avoided to occur being tempered or the phenomenon of fail to start when starting, and be advantageous to the foundation of engine oil pressure and engine component lubrication, the dynamic property and reliability of hybrid power system are enhanced to a certain extent.
Description
Technical field
The present invention relates to a kind of hybrid electric vehicle engine fast startup procedure, belongs to Development of HEV Technology neck
Domain.
Background technology
Hybrid vehicle, which is defined as at least a kind of accumulator, the energy or energy converter, can provide the car of electric energy
, because hybrid vehicle wishes that engine works in higher efficiency area, therefore, in car running process, engine needs
Often to start/shut down.In the prior art, people often carry out engine fast starting using following methods：ISG in starting process
After engine to be quickly dragged to the rotating speed of a certain setting with constant torque all the time for motor, ISG moments of torsion are removed as 0Nm at once.This control
Method processed has the following disadvantages：(1) starting time is too short, easily causes engine flashback or fail to start；(2) because of the starting time
Too short, for the parts lubrication of engine without establishing at once, long-term work is fragile under this operating mode.(3) because starting torque compared with
Greatly, the impact that the torsion vibration absorber in starting process between engine and ISG is subject to is big, and long-term work is reversed under this operating mode to be subtracted
It is fragile to shake device.These have impact on the reliability of hybrid power system to a certain extent.
In addition, also have other engine starting methods in the prior art, such as an Application No.
201310087403.X, the Chinese patent application of entitled " engine startup method ", discloses a kind of engine start
Method, this method need control the torque of motor offer and separation clutch given simultaneously to transmit torque, this method
In：The torque that motor provides first is changed in the form of step in reduction or increase, this can to engine or
Clutch causes certain impact, and it can be caused to damage in the past for a long time；In addition, this method also need to control in real time clutch to
Fixed transmits torque, and it is to realize the controllable of torque by adjusting separation clutch degree of engagement that can transmit torque, and this is just needed
There is the control of higher degree to clutch, control relatively complicated.So control in engine startup method disclosed in this application
Object processed is more, and control is relatively complicated.
The content of the invention
It is an object of the invention to provide a kind of hybrid electric vehicle engine fast startup procedure, to solve existing hair
The problem of impact of the engine start method to torsion vibration absorber is larger.
To achieve the above object, the solution of the present invention includes a kind of hybrid electric vehicle engine fast startup procedure, is：
Apply driving torque T to engine, the rotating speed n of engine is gradually increased, as the rotating speed n=n3 of engine, T gradually subtracts
Small, n3 is a setting speed value.
As the rotating speed n=n2 of engine, to engine ignition, n2 is the tachometer value less than n3.
As the rotating speed n=n1 of engine, supplied to engine, n1 is the tachometer value less than n2.
The process that the T gradually decreases to zero is linear.
As n ＜ n3, T=T1, T1 are steady state values.
When the rotating speed of engine increases to n4 by n3, if driving torque T is not reduced to zero, then, driving is turned
Square is set to 0, and the n4 starts successful engine speed for judgement engine.
When engine also provides power for other mechanical loads, as n ＜ n3, the driving torque T to engine application
=T2, T2 are steady state values.
T1 ＜ T2.
It is described when engine also provides power for other mechanical loads, as the rotating speed n=n3 of engine, T gradually subtracts
It is small, when n increases to n5, if driving torque T is not reduced to zero, then, driving torque is set to 0, the n5 is described
When engine also provides power for other mechanical loads, judge that engine starts successful engine speed.
n4<n5。
To engine drive torque, the rotating speed of engine gradually increases, when the rotating speed of engine reaches certain value, the drive
Dynamic torque is gradually reduced, and the impact brought to the torsion vibration absorber between other parts, such as engine and ISG motors is smaller,
Damaged condition is relatively reduced.
It is additionally, since driving torque gradually to cancel, there is certain starting time, it is too short not only avoids the starting time
The engine brought occurs being tempered or the phenomenon of fail to start, and is advantageous to engine oil pressure and engine component lubrication
Foundation, avoid the damage of engine component, enhance the dynamic property and reliability of hybrid power system to a certain extent.
When engine just starts to start, to the driving torque of one constant of engine, it ensure that engine rises faster
Dynamic, rotating speed is lifted faster, is advantageous to the quick startup of engine, is avoided with the long influence vehicle of vehicle mode conversion time
Dynamic property.
Engine starting method provided by the invention only needs to control the driving torque to engine, does not in addition have
There are other control objects, control parameter is more single, therefore control is relatively easy, not cumbersome, and is not easy control occur
Error.
Brief description of the drawings
Fig. 1 is the structural representation of the series-parallel hybrid electric system in embodiment 1；
Fig. 2 is the structural representation of the series-parallel hybrid electric system in embodiment 2；
Fig. 3 is the flow chart of the engine starting method of embodiment 2；
Fig. 4 is the rotary speed-torque figure of ISG motors in engine startup.
Embodiment
The present invention will be further described in detail below in conjunction with the accompanying drawings.
Embodiment 1
Hybrid electric vehicle engine fast startup procedure provided by the invention, it is：Apply driving torque T to engine,
The rotating speed n of engine is set gradually to increase, as the rotating speed n=n3 of engine, T is gradually reduced, and n3 is a setting speed.
In order to express above-mentioned technical proposal in detail, it is specifically described below in conjunction with the accompanying drawings.
Such as a kind of series-parallel hybrid electric system as shown in Figure 1, including controller, engine 1, torsion vibration absorber 2,
ISG motors 3, electric control clutch 4, motor 5, ISG electric machine controllers 6, drive motor controller 7, energy storage device 8.Control
Device is not drawn in figure, and the controller can use the original entire car controller of vehicle, individually can also additionally install additional.Controller
Control connection engine 1 and ISG motors 3, engine 1 direct or through torsion vibration absorber 2 and connected with the machine driving of ISG motors 3
Connect, ISG motors 3 are connected by electric control clutch 4 with the machine driving of motor 5, and motor 5 connects drive axle, ISG motors
3 and motor 5 electrically connected by respective controller 6,7 with energy storage device 8.
When vehicle needs to walk, and engine needs to start, it is first determined clutch 4 is in released state and engine is expired
Sufficient starting conditions, now controller control ISG motors give one constant driving torque of engine.
During beginning, after giving the constant driving torque T1 of one, engine, the rotating speed of engine gradually increases, engine
Rotating speed passes through tetra- set points of n1, n2, n3 and n4 successively, and wherein n4 starts successful engine speed for judgement engine.When
When engine speed reaches n1, control and supplied to engine；When engine speed reaches n2, control to engine ignition；When
When engine speed reaches n3, the driving torque provided with the rise ISG motors of rotating speed is gradually reduced；When engine speed reaches
During n4, judge that engine plays machine success, now no matter driving torque is either with or without dropping to zero, be required for driving torque being set to 0, i.e.,
Driving torque is removed, after rotating speed is more than n4, driving torque is maintained 0Nm always.
N1, n2, n3, n4 relation is:0<n1<n2<n3<n4.
Driving torque can linearly be reduced, or non-linear reduction, such as：Parabola, as the mode of optimization,
Driving torque linearly reduces.
The above method is not limited to above-mentioned series-parallel hybrid electric system or parallel, tandem dynamical system
System.
It is above-mentioned as the rotating speed n of engine<During n3, given driving torque T=T1, T1 are constant, as other real
Mode is applied, as the rotating speed n of engine<During n3, given driving torque T can be the value of a change.
In above-described embodiment, before rotating speed reaches n3, it can be supplied in n1 to engine, be to give engine point in n2
Fire, of the invention focuses on：When rotating speed reaches n3, given driving torque is gradually reduced with the increase of rotating speed, based on upper
State inventive point, as other embodiments, can should not before n1 and n2 the step of, need to only focus at n3.
Embodiment 2
In the present embodiment, engine also extra band has mechanical load, and the mechanical load is by taking compressor of air conditioner as an example, such as
A kind of series-parallel hybrid electric system shown in Fig. 2, including controller, engine 11, torsion vibration absorber 12, ISG motors 13, electricity
Control clutch 14, motor 15, ISG electric machine controllers 16, drive motor controller 17, energy storage device 18, air-conditioning electromagnetism from
Clutch 19 and compressor of air conditioner 20.Controller is not drawn in figure, and the controller can use the original entire car controller of vehicle,
Individually can also additionally it install additional.Controller control connection engine 11 and ISG motors 13, engine 11 direct or through torsion
Damper 12 is connected with the machine driving of ISG motors 13, and ISG motors 13 pass through electric control clutch 14 and the machine driving of motor 15
Connection, motor 15 connect drive axle, ISG motors 13 and motor 15 and filled by respective controller 16,17 and energy storage
18 electrical connections are put, engine directs or through belt transmission or gear drive and is connected with air-conditioning electromagnetic clutch 19,
Then air-conditioning electromagnetic clutch 19 is connected with the machine driving of compressor of air conditioner 20.
Fig. 3 is the flow chart of engine starting method, wherein, when engine does not drive compressor of air conditioner to work, that is, send out
During clutch separation between motivation and compressor of air conditioner, control process is not done superfluous here as in above-described embodiment 1
State.When driven by engine compressor of air conditioner works, i.e., when the clutch between engine and compressor of air conditioner is combined, start control
Process processed is as follows：
When vehicle needs to walk, and engine needs to start, it is first determined clutch is in released state and engine is expired
Sufficient starting conditions, now ISG motors give engine one constant driving torque.
During beginning, the constant driving torque T2 of one, engine is given, the rotating speed of engine gradually increases, and engine turns
Speed passes through tetra- set points of n1, n2, n3 and n5 successively, and wherein n5 starts successful engine speed for judgement engine.Work as hair
When motivation rotating speed reaches n1, control and supplied to engine；When engine speed reaches n2, control to engine ignition；Work as hair
When motivation rotating speed reaches n3, the driving torque provided with the rise ISG motors of rotating speed is gradually reduced；When engine speed reaches n5
When, judge that engine plays machine success, now no matter driving torque is either with or without dropping to zero, be required for driving torque being set to 0, that is, remove
Fall driving torque, after rotating speed is more than n5, driving torque is maintained 0Nm always.
N1, n2, n3, n5 relation is:0<n1<n2<n3<n5.
Driving torque can linearly be reduced, or non-linear reduction, such as：Parabola, as the mode of optimization,
Driving torque linearly reduces.
The above method is not limited to above-mentioned series-parallel hybrid electric system or parallel, tandem dynamical system
System.
It is above-mentioned as the rotating speed n of engine<During n3, given driving torque T=T2, T2 are constant, as other real
Mode is applied, as the rotating speed n of engine<During n3, given driving torque T can be the value of a change.
When driven by engine compressor of air conditioner works, a part of power of engine is consumed by compressor of air conditioner, and this is unfavorable
In the starting of engine, so, when driven by engine compressor of air conditioner works, it is greater than for its driving torque provided and starts
It is the driving torque of its offer when machine does not drive the compressor of air conditioner to work, i.e. T1 and T2 relation are T1 ﹤ T2.
Being gradually reduced for driving torque is advantageous to reduce the impact to the torsion vibration absorber between engine and ISG；Also,
Driving torque is not to cancel immediately, but gradually cancel, there is certain starting time, be advantageous to the engine oil pressure of engine
Foundation, and the lubrication of engine component.
N1, n2, n3, n4 and n5 are set as the case may be, and its relation is:0<n1<n2<n3<n4<n5.Such as Fig. 4 institutes
Showing, abscissa is engine speed, and ordinate is the driving torque that ISG is provided, when curve 1 represents that air-conditioning does not work, the table of curve 2
When showing air-conditioning work.
Compressor of air conditioner works is supplied to the driving torque of engine different with the two states that do not work, and by right
The setting of design parameter can make engine start time essentially identical.And being gradually reduced for driving torque is advantageous to mitigate to hair
The impact of torsion vibration absorber between motivation and ISG.And engine can be started smoothly when playing machine every time, engine in starting process
Parts lubrication easily set up, these ensure that the dynamic property and reliability of hybrid power system to a certain extent.
In above-described embodiment, before rotating speed reaches n3, it can be supplied in n1 to engine, be to give engine point in n2
Fire, of the invention focuses on：When rotating speed reaches n3, given driving torque is gradually reduced with the increase of rotating speed, based on upper
State inventive point, as other embodiments, can should not before n1 and n2 the step of, need to only focus at n3.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.The base of the present invention
This thinking is above-mentioned basic scheme, the change carried out without departing from the principles and spirit of the present invention to embodiment
Change, change, replacing and modification is still fallen within protection scope of the present invention.
Claims (8)
1. a kind of hybrid electric vehicle engine fast startup procedure, it is characterised in that the starting method is：Applied to engine
Add driving torque T, the rotating speed n of engine is gradually increased, as the rotating speed n=n3 of engine, T is gradually reduced, and n3 sets for one
Determine tachometer value；As n ＜ n3, T=T1, T1 are steady state values；When the rotating speed of engine increases to n4 by n3, if driving torque
T is not reduced to zero, then, driving torque is set to 0, the n4 starts successful engine speed for judgement engine.
2. hybrid electric vehicle engine fast startup procedure according to claim 1, it is characterised in that when engine
During rotating speed n=n2, to engine ignition, n2 is the tachometer value less than n3.
3. hybrid electric vehicle engine fast startup procedure according to claim 2, it is characterised in that when engine
During rotating speed n=n1, supplied to engine, n1 is the tachometer value less than n2.
4. hybrid electric vehicle engine fast startup procedure according to claim 1, it is characterised in that the T is gradual
The process for being reduced to zero is linear.
5. hybrid electric vehicle engine fast startup procedure according to claim 1, it is characterised in that when engine also
When providing power for other mechanical loads, as n ＜ n3, the driving torque T=T2, T2 that apply to engine are steady state values.
6. hybrid electric vehicle engine fast startup procedure according to claim 5, it is characterised in that T1 ＜ T2.
7. hybrid electric vehicle engine fast startup procedure according to claim 5, it is characterised in that described to start
When machine also provides power for other mechanical loads, as the rotating speed n=n3 of engine, T is gradually reduced, when n increases to n5, such as
Fruit driving torque T is not reduced to zero, then, driving torque is set to 0, the n5 is described when engine is also other machineries
When load provides power, judge that engine starts successful engine speed.
8. hybrid electric vehicle engine fast startup procedure according to claim 7, it is characterised in that n4<n5.
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| CN201510220370.0A CN104890667B (en) | 2015-05-04 | 2015-05-04 | A kind of hybrid electric vehicle engine fast startup procedure |
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| CN201510220370.0A CN104890667B (en) | 2015-05-04 | 2015-05-04 | A kind of hybrid electric vehicle engine fast startup procedure |
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| CN104890667B true CN104890667B (en) | 2017-11-14 |
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| CN106184197B (en) * | 2016-07-12 | 2018-11-02 | 重庆长安汽车股份有限公司 | A kind of idle stop control method, control system and hybrid vehicle |
| CN109915298B (en) * | 2019-02-28 | 2020-09-08 | 武汉理工大学 | Control method for quick start of engine of hybrid electric vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101947915A (en) * | 2010-09-03 | 2011-01-19 | 中国汽车技术研究中心 | Engine start-stop controlling method in switching process of strong hybrid power operating modes of automobile |
| WO2013035165A1 (en) * | 2011-09-06 | 2013-03-14 | トヨタ自動車株式会社 | Hybrid vehicle control apparatus |
| CN103597200A (en) * | 2011-09-07 | 2014-02-19 | 三菱电机株式会社 | Vehicle starting apparatus |
| CN104066635A (en) * | 2013-01-21 | 2014-09-24 | 丰田自动车株式会社 | Vehicle control device |
| CN104554240A (en) * | 2014-12-31 | 2015-04-29 | 郑州宇通客车股份有限公司 | Serial-to-parallel control method of electrical-electric connecting type hybrid power system |
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- 2015-05-04 CN CN201510220370.0A patent/CN104890667B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101947915A (en) * | 2010-09-03 | 2011-01-19 | 中国汽车技术研究中心 | Engine start-stop controlling method in switching process of strong hybrid power operating modes of automobile |
| WO2013035165A1 (en) * | 2011-09-06 | 2013-03-14 | トヨタ自動車株式会社 | Hybrid vehicle control apparatus |
| CN103796890A (en) * | 2011-09-06 | 2014-05-14 | 丰田自动车株式会社 | Hybrid vehicle control apparatus |
| CN103597200A (en) * | 2011-09-07 | 2014-02-19 | 三菱电机株式会社 | Vehicle starting apparatus |
| CN104066635A (en) * | 2013-01-21 | 2014-09-24 | 丰田自动车株式会社 | Vehicle control device |
| CN104554240A (en) * | 2014-12-31 | 2015-04-29 | 郑州宇通客车股份有限公司 | Serial-to-parallel control method of electrical-electric connecting type hybrid power system |
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Address after: 450061 Yutong Road, Guancheng District, Zhengzhou City, Henan Province Patentee after: Yutong Bus Co., Ltd Address before: 450016 shibalihe Yutong Industrial Park, Zhengzhou City, Henan Province Patentee before: Zhengzhou Yutong Bus Co., Ltd |