CN107288734A - Heavy duty diesel engine high/low temperature cooling system and cooling circuit - Google Patents
Heavy duty diesel engine high/low temperature cooling system and cooling circuit Download PDFInfo
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- CN107288734A CN107288734A CN201710707827.XA CN201710707827A CN107288734A CN 107288734 A CN107288734 A CN 107288734A CN 201710707827 A CN201710707827 A CN 201710707827A CN 107288734 A CN107288734 A CN 107288734A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/20—Cooling circuits not specific to a single part of engine or machine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/18—Arrangements or mounting of liquid-to-air heat-exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
- F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0406—Layout of the intake air cooling or coolant circuit
- F02B29/0437—Liquid cooled heat exchangers
- F02B29/0443—Layout of the coolant or refrigerant circuit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/23—Layout, e.g. schematics
- F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/18—Arrangements or mounting of liquid-to-air heat-exchangers
- F01P2003/182—Arrangements or mounting of liquid-to-air heat-exchangers with multiple heat-exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2060/00—Cooling circuits using auxiliaries
- F01P2060/02—Intercooler
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2060/00—Cooling circuits using auxiliaries
- F01P2060/12—Turbo charger
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2060/00—Cooling circuits using auxiliaries
- F01P2060/14—Condenser
-
- 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
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Supercharger (AREA)
Abstract
The invention discloses heavy duty diesel engine high/low temperature cooling system and cooling circuit, it includes turbocharger (1), engine (2), high temperature heat sink (3), fan (4), low-temperature radiator (5), exhaust gas circulating device (6), cold charge air cooler (7), a cool condenser (8) and SCR device (9)；Described low-temperature radiator (5), high temperature heat sink (3), fan (4) are that, positioned at the front of described engine (2), described SCR device (9) is located at the rear of described turbocharger (1)；Cold loop during described turbocharger (1) is connected and formed with a cold charge air cooler (7), engine (2) successively；It overcomes the shortcoming for the thermic load for increasing radiator in the prior art, and the advantage of the complexity of arrangement can be reduced with more extra coolers of integrated cooling such as oil cooler etc with low-temperature circuit the inside.
Description
Technical field
More specifically it is heavy duty diesel engine high/low temperature the present invention relates to the cooling system of heavy duty diesel engine
Cooling system and cooling circuit.
Background technology
Traditional heavy truck front-end cooling module is made up of condenser, radiator, charge air cooler and is arranged on motor head, leads to
Crossing the fan installed in refrigerating module rear end uses air-cooled mode to carry out thermal convection current with the cooling medium inside each exchanger, from
And take away the heat of medium in heat exchanger.
Condenser is the building block of air-conditioning system, it is ensured that good refrigeration in driving cabin.Radiator is engine
The main building block of cooling system, its main function is to ensure that engine works at a suitable temperature, prevents engine mistake
Cold or overheat.
Charge air cooler is the important composition part of ICS intercooler system, and its main function is reduction compressed air after turbocharging
Temperature, it is ensured that the air for having sufficient density is fully burnt into engine cylinder-body with fuel oil, the fuel oil warp of lifting engine
Ji property and dynamic property, while also reducing the carbon emission of engine.The fundamental diagram of engine-cooling system and ICS intercooler system is (such as
Fig. 1).
With the customer demand of efficient logistics and vehicle fuel economy, domestic major main engine plants are developing 500 horsepowers
Above high-powered engine is, it is necessary to which more high performance heat exchanger meets the work requirements of high-powered engine.It is simultaneously
Meet the automobile emission regulation requirement in the 6th stage.In the draining technology using exhaust gas circulating device+SCR device
In the case of route, the heat of exhaust gas circulating device is needed to be taken away by radiator, and the thermic load of radiator is increased in the case of this
(reference picture 2).Simultaneously with increasingly strict and lifting fuel economy the demand of regulation, outlet temperature and the state five of charge air cooler
Discharge compared to require it is lower in cold outlet temperature, this also requires that charge air cooler has more preferable heat-sinking capability.
The content of the invention
The first object of the present invention is the weak point for overcoming above-mentioned background technology, and proposes that heavy duty diesel engine is high
Low-temperature cooling system.
The technical scheme is that implemented by following measure：Heavy duty diesel engine high/low temperature cooling system,
It include turbocharger, engine, high temperature heat sink, fan, low-temperature radiator, exhaust gas circulating device, a cold charge air cooler,
Cool condenser and SCR device；
Described low-temperature radiator, high temperature heat sink, fan are positioned at the front of described engine, described selection
Property catalysis reductor be located at described turbocharger rear；
Cold loop during described turbocharger is connected and formed with a cold charge air cooler, engine successively.
Described high temperature heat sink is connected with described engine and forms High-temperature cooling loop；
Be provided with exhaust gas circulating device on described engine, it is described between cold charge air cooler be arranged on described engine
On, described low-temperature radiator is connected with a cold charge air cooler and a cool condenser one end and forms coolant cooling circuit respectively.
In the above-mentioned technical solutions：Section is installed on pipeline between described high temperature heat sink and described engine
Warm device and high-temperature circuit water pump.
In the above-mentioned technical solutions：Described low-temperature radiator and it is described between set on pipeline between cold charge air cooler
There is low-temperature circuit pump.
In the above-mentioned technical solutions：Described low-temperature radiator, high temperature heat sink are installed on fan front；Described low temperature
Radiator uses integral structure with described high temperature heat sink.
In the above-mentioned technical solutions：Integral thickness between described low-temperature radiator and described high temperature heat sink is
90-100 centimetres.
In the above-mentioned technical solutions：Described low-temperature radiator is consistent with the core body area of described high temperature heat sink, and
Described low-temperature radiator is united using the thick pipe band core architecture of 16 millimeters or 26 millimeters of cores, described fan using automatically controlled silicone oil from
Clutch fan.
The second object of the present invention is to propose a kind of cooling circuit：Heavy duty diesel engine high/low temperature cooling system and
Cooling circuit, it comprises the following steps；
1., the high-temperature gas that described turbocharger is produced enter it is described between in cold charge air cooler (7), now low temperature
Cooling water in radiator separately flows between a cold charge air cooler is neutralized and carries out heat exchange respectively in cool condenser (8)；
2., enter operating in engine in the step high-temperature gas that 1. middle cooling is completed to use, described engine production
A raw waste gas part is excluded via pipeline, another part be drained into the exhaust gas circulating device that top sets re-enter into it is described
Engine in use；
3., the high temperature coolant in described high temperature heat sink enters in engine via high-temperature circuit water pump, and cooling is but
The described engine run at high speed is used；
4. after, in step, 2. the middle low-temperature cooling water for completing cooling completes cooling, it can heat up and respectively via cold in cold
Device and the outflow of the cool condenser other end, re-enter into described low-temperature radiator the fan set again by lower section again
Cooling is used.
In the above-mentioned technical solutions：When external environment is too low；Described high temperature heat sink is stopped using, only described hair
Motivation carries out self-loopa cooling.
In the above-mentioned technical solutions：Integral thickness between described low-temperature radiator and described high temperature heat sink is
90-100 centimetres.
The present invention has following technological merit：1st, the thickness of front-end module is reduced, designs compacter, reduces module
Windage, adds the air intake efficiency of heat exchanger, so that changing front-end cooling module preferably plays heat dispersion.Using automatically controlled
In the case of silicon-oil fan, it is possible to reduce the at a fully engaged time of fan, the power consumption of engine is reduced, the fuel-economizing for having 1%
Effect.
2nd, a cold charge air cooler is directly installed on engine body, and the impulse stroke of pressurized air is shortened, air-cooled with tradition
Charge air cooler is compared, and can reduce charge air cooler internal resistance 50%.Add the intake efficiency of engine and improve engine power and combustion
Oily economy.3rd, by using the pressurized air type of cooling of water cooling, the pressurized air into motor intake manifold can be made
Lower temperature is reached, is conducive to improving the abundant burning of fuel oil, and the carbon emission of reduction engine.
4th, coolant cooling circuit is the cooling system of an independent control, in vehicle startup stage, can be low by controlling
Coolant rate in temperature loops reaches the effect of rapid warming-up so as to quickly raise the delivery temperature of engine, is conducive to choosing
Selecting property is catalyzed the conversion efficiency of reductor.
5th, arrangement can be reduced with more extra coolers of integrated cooling such as oil cooler etc inside low-temperature circuit
Complexity.
Brief description of the drawings
Fig. 1 is the fundamental diagram of engine-cooling system and ICS intercooler system in the prior art.
Fig. 2 is the fundamental diagram of the engine-cooling system with exhaust gas circulating device and ICS intercooler system in the prior art.
Fig. 3 is the fundamental diagram of high/low temperature engine-cooling system and ICS intercooler system.
In figure：Turbocharger 1, engine 2, high temperature heat sink 3, fan 4, low-temperature radiator 5, exhaust gas circulating device 6,
Between cold charge air cooler 7, a cool condenser 8, SCR device 9, thermostat 10, low-temperature circuit pump 11, high-temperature circuit water pump
12。
Embodiment
Illustrate the performance of the present invention below in conjunction with the accompanying drawings, but they do not constitute limitation of the invention, only lift
Example.Simultaneously by illustrating that advantages of the present invention will become clearer and be readily appreciated that.
Shown in reference picture 1-3：Heavy duty diesel engine high/low temperature cooling system, it include turbocharger 1, engine 2,
High temperature heat sink 3, fan 4, low-temperature radiator 5, exhaust gas circulating device 6, a cold charge air cooler 7, a cool condenser 8 and selectivity are urged
Change reductor 9；
Described low-temperature radiator 5, high temperature heat sink 3, fan 4 be positioned at the front of described engine 2, it is described
SCR device 9 is located at the rear of described turbocharger 1；
Cold loop is (in such as Fig. 3 during described turbocharger 1 is connected and formed with a cold charge air cooler 7, engine 2 successively
It is real to draw arrow line)；
Described high temperature heat sink 3 is connected with described engine 2 and forms High-temperature cooling loop (draws ripple in fact in such as Fig. 3
Unrestrained line)；
Be provided with exhaust gas circulating device 6 on described engine 2, it is described between cold charge air cooler 7 be arranged on described hair
In motivation 2, described low-temperature radiator 5 is connected with cold charge air cooler 7 and a cool condenser 8 one end and forms low temperature cold respectively
But loop (stipple line in fact in such as Fig. 3)；
Thermostat 10 is installed on the pipeline between described high temperature heat sink 3 and described engine 2 and high temperature is returned
Road water pump 12.
Described low-temperature radiator 5 and it is described between be provided with low-temperature circuit pump 11 on pipeline between cold charge air cooler 7.
Described low-temperature radiator 5, high temperature heat sink 3 are installed on the front end of fan 4；Described low-temperature radiator 5 with it is described
High temperature heat sink 3 use integral structure.
Integral thickness between described low-temperature radiator 5 and described high temperature heat sink 3 is 90-100 centimetres.
Described low-temperature radiator 5 low-temperature radiator consistent and described with the core body area of described high temperature heat sink 3
5 are united using the thick pipe band core architecture of 16 millimeters or 26 millimeters of cores, and described fan 4 uses electric-controlled silicon oil clutch fan.
Present invention additionally comprises a kind of cooling circuit：Heavy duty diesel engine high/low temperature cooling circuit, it comprises the following steps；
1., the high-temperature gas that described turbocharger 1 is produced enter it is described between in cold charge air cooler 7, now low temperature
Cooling water in radiator 5 separately flows between a cold charge air cooler 7 is neutralized and carries out heat exchange respectively in cool condenser 8；
2., enter operating in engine 2 in the step high-temperature gas that 1. middle cooling is completed to use, described engine 2
A waste gas part for generation is excluded via pipeline, and the exhaust gas circulating device 6 that another part is drained into top setting is re-entered into
Used in described engine 2；
3., the high temperature coolant in described high temperature heat sink 3 enters in engine 2 via high-temperature circuit water pump 12, supplies
The described engine 2 run at high speed is cooled down to use；
4. after, in step, 2. the middle low-temperature cooling water for completing cooling completes cooling, it can heat up and respectively via cold in cold
Device 7 and the outflow of the other end of a cool condenser 8, re-enter into the fan 4 set again by lower section in described low-temperature radiator 5
Again cooling is used.
When external environment is too low；Described high temperature heat sink 3 is stopped using, and only described engine 2 carries out self-loopa
Cooling.
Above-mentioned unspecified part is prior art.
Claims (9)
1. heavy duty diesel engine high/low temperature cooling system, it is characterised in that：It include turbocharger (1), engine (2),
High temperature heat sink (3), fan (4), low-temperature radiator (5), exhaust gas circulating device (6), cold charge air cooler (7), a cool condenser
And SCR device (9) (8)；
Described low-temperature radiator (5), high temperature heat sink (3), fan (4) are positioned at the front of described engine (2), institute
The SCR device (9) stated is located at the rear of described turbocharger (1)；
Cold loop during described turbocharger (1) is connected and formed with a cold charge air cooler (7), engine (2) successively；
Described high temperature heat sink (3) is connected with described engine (2) and forms High-temperature cooling loop；
Be provided with exhaust gas circulating device (6) on described engine (2), it is described between cold charge air cooler (7) be arranged on described
On engine (2), described low-temperature radiator (5) is connected simultaneously with a cold charge air cooler (7) and a cool condenser (8) one end respectively
Form coolant cooling circuit.
2. heavy duty diesel engine high/low temperature cooling system according to claim 1, it is characterised in that：In described high temperature
Thermostat (10) and high-temperature circuit water pump (12) are installed on pipeline between radiator (3) and described engine (2).
3. heavy duty diesel engine high/low temperature cooling system according to claim 1 or 2, it is characterised in that：Described
Low-temperature radiator (5) and it is described between be provided with low-temperature circuit pump (11) on pipeline between cold charge air cooler (7).
4. heavy duty diesel engine high/low temperature cooling system according to claim 3, it is characterised in that：Described low temperature dissipates
Hot device (5), high temperature heat sink (3) are installed on fan (4) front end；Described low-temperature radiator (5) and described high temperature heat sink
(3) integral structure is used.
5. heavy duty diesel engine high/low temperature cooling system according to claim 4, it is characterised in that：Described low temperature dissipates
Integral thickness between hot device (5) and described high temperature heat sink (3) is 90-100 centimetres.
6. heavy duty diesel engine high/low temperature cooling system according to claim 4, it is characterised in that：Described low temperature dissipates
Hot device (5) low-temperature radiator (5) consistent and described with the core body area of described high temperature heat sink (3) using 16 millimeters or
The thick pipe band core architecture of 26 millimeters of cores is united, and described fan (4) uses electric-controlled silicon oil clutch fan.
7. the loop of the heavy duty diesel engine high/low temperature cooling system in claim 1-6 described in any claim is cooled down,
It is characterized in that：It comprises the following steps；
1., the high-temperature gas that described turbocharger (1) is produced enter it is described between in cold charge air cooler (7), now low temperature
Cooling water in radiator (5) separately flows between a cold charge air cooler (7) neutralizes and carries out heat exchange respectively in cool condenser (8)；
2., enter operating in engine (2) in the step high-temperature gas that 1. middle cooling is completed to use, described engine (2)
A waste gas part for generation is excluded via pipeline, and the exhaust gas circulating device (6) that another part is drained into top setting is reentered
Used into described engine (2)；
3., the high temperature coolant in described high temperature heat sink (3) enters in engine (2) via high-temperature circuit water pump (12),
The described engine (2) that cooling but runs at high speed is used；
4. after, in step, 2. the middle low-temperature cooling water for completing cooling completes cooling, it can heat up and respectively via a cold charge air cooler (7)
With the outflow of a cool condenser (8) other end, the fan set again by lower section in described low-temperature radiator (5) is re-entered into
(4) cooling is used again.
8. the loop of heavy duty diesel engine high/low temperature cooling system according to claim 6, it is characterised in that：Work as the external world
When environment is too low；Described high temperature heat sink (3) is stopped using, and only described engine (2) carries out self-loopa cooling.
9. the loop of heavy duty diesel engine high/low temperature cooling system according to claim 8, it is characterised in that：Described
Integral thickness between low-temperature radiator (5) and described high temperature heat sink (3) is 90-100 centimetres.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710707827.XA CN107288734A (en) | 2017-08-17 | 2017-08-17 | Heavy duty diesel engine high/low temperature cooling system and cooling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710707827.XA CN107288734A (en) | 2017-08-17 | 2017-08-17 | Heavy duty diesel engine high/low temperature cooling system and cooling circuit |
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| CN107288734A true CN107288734A (en) | 2017-10-24 |
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ID=60106654
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| CN201710707827.XA Pending CN107288734A (en) | 2017-08-17 | 2017-08-17 | Heavy duty diesel engine high/low temperature cooling system and cooling circuit |
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Cited By (6)
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| CN107762619A (en) * | 2017-11-17 | 2018-03-06 | 安庆中船柴油机有限公司 | A kind of dual fuel engine peculiar to vessel |
| CN107762613A (en) * | 2017-11-17 | 2018-03-06 | 安庆中船柴油机有限公司 | A kind of combustion type engine peculiar to vessel |
| CN108625970A (en) * | 2018-03-29 | 2018-10-09 | 潍柴动力股份有限公司 | Water-cooling heat radiating system and engineering truck for engineering truck |
| CN109139221A (en) * | 2018-09-29 | 2019-01-04 | 徐州徐工汽车制造有限公司 | A kind of six high-power heavy truck cooling device of state |
| CN111828160A (en) * | 2020-07-24 | 2020-10-27 | 中车大连机车车辆有限公司 | System and method for improving cooling effect of engine and vehicle comprising system |
| CN113513401A (en) * | 2021-03-29 | 2021-10-19 | 广西玉柴机器股份有限公司 | Method for quickly raising temperature in starting process of hybrid engine and engine controller |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109139221A (en) * | 2018-09-29 | 2019-01-04 | 徐州徐工汽车制造有限公司 | A kind of six high-power heavy truck cooling device of state |
| CN109139221B (en) * | 2018-09-29 | 2023-08-29 | 徐州徐工汽车制造有限公司 | Cooling device for national six-horsepower heavy truck |
| CN111828160A (en) * | 2020-07-24 | 2020-10-27 | 中车大连机车车辆有限公司 | System and method for improving cooling effect of engine and vehicle comprising system |
| CN111828160B (en) * | 2020-07-24 | 2021-10-08 | 中车大连机车车辆有限公司 | System and method for improving cooling effect of engine and vehicle comprising system |
| CN113513401A (en) * | 2021-03-29 | 2021-10-19 | 广西玉柴机器股份有限公司 | Method for quickly raising temperature in starting process of hybrid engine and engine controller |
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Address after: 430056 Maple Five Road, Wuhan Economic and Technological Development Zone, Wuhan City, Hubei Province Applicant after: Dongfeng Malerje Systems Co., Ltd. Address before: 430056 Maple Five Road, Wuhan Economic and Technological Development Zone, Wuhan City, Hubei Province Applicant before: Dongfeng Behr Thermal Systems Co., Ltd. |
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