CN111963294B - Efficient hybrid engine cooling system - Google Patents
Efficient hybrid engine cooling system Download PDFInfo
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- CN111963294B CN111963294B CN202010719520.3A CN202010719520A CN111963294B CN 111963294 B CN111963294 B CN 111963294B CN 202010719520 A CN202010719520 A CN 202010719520A CN 111963294 B CN111963294 B CN 111963294B
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- engine
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- cooling
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- 238000001816 cooling Methods 0.000 title claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 126
- 239000000498 cooling water Substances 0.000 claims abstract description 41
- 239000010705 motor oil Substances 0.000 claims abstract description 15
- 210000000476 body water Anatomy 0.000 claims abstract description 14
- 230000000694 effects Effects 0.000 claims description 3
- 230000017525 heat dissipation Effects 0.000 claims description 3
- 239000002918 waste heat Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Classifications
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
- F01M5/002—Cooling
-
- 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
- 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
- F01P5/00—Pumping cooling-air or liquid coolants
- F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
- F01P5/12—Pump-driving arrangements
-
- 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
-
- 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
-
- 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
- F01P5/00—Pumping cooling-air or liquid coolants
- F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
- F01P2005/105—Using two or more pumps
-
- 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
- F01P5/00—Pumping cooling-air or liquid coolants
- F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
- F01P5/12—Pump-driving arrangements
- F01P2005/125—Driving auxiliary pumps electrically
-
- 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
- F01P2007/143—Controlling of coolant flow the coolant being liquid using restrictions
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Supercharger (AREA)
Abstract
The invention provides a high-efficiency hybrid engine cooling system, which comprises: the engine comprises a mechanical pump, a cylinder cover water jacket, an engine body water jacket, a supercharger cooling water channel, an EGR cooler, a temperature regulator, an engine oil cooler, a radiator, an electronic water pump and a one-way valve; the water outlet of the mechanical pump is respectively communicated with the water inlet of the engine oil cooler and the water inlet of the cylinder cover water jacket through pipelines, and the water outlet of the cylinder cover water jacket is respectively communicated with the water inlet of the supercharger cooling water channel and the water inlet of the engine body water jacket through pipelines; the high-efficiency hybrid engine cooling system provided by the invention adopts the combination of the mechanical pump and the electronic water pump, can still operate when in shutdown, can still effectively cool the engine body, the cylinder cover, the supercharger and the EGR cooler, cannot be accelerated and damaged due to waste heat, and keeps the operation reliability of the engine.
Description
Technical Field
The invention belongs to the technical field of engine cooling, and particularly relates to a high-efficiency hybrid engine cooling system.
Background
The cooling system is an important component of the engine. During engine operation, parts in contact with high temperature fuel gas or exhaust gas are strongly heated, and a cooling system is required to dissipate excessive heat from these parts, which may otherwise have various adverse consequences, such as: lubricating oil deterioration and normal oil film damage; the heated part expands to destroy the normal clearance of the kinematic pair; the part has reduced thermal mechanical properties and even fails. In addition, too much cooling is not possible, otherwise poor combustion occurs, emissions are increased, and fuel economy is reduced; the viscosity of engine oil is increased, friction loss of kinematic pairs is increased, engine operation is rough, engine power is reduced, and service life is prolonged.
The invention discloses a cooling system for integrated heat dissipation of a hybrid electric vehicle and a control method thereof, wherein the cooling system comprises a high-temperature cooling loop, a low-temperature cooling loop and a control loop, the high-temperature cooling loop comprises a high-temperature radiator, a first electronic water pump, an engine, a gearbox oil heat exchanger and a temperature-saving valve, one end of the high-temperature radiator is connected with an inlet of the first electronic water pump, an outlet of the first electronic water pump is connected with the engine, the gearbox oil heat exchanger is connected with a first interface of the temperature-saving valve, the other end of the high-temperature heat exchanger is connected with a second interface of the temperature-saving valve, a third interface of the temperature-saving valve is connected with an inlet of the first electronic water pump, a cooling fan is arranged at the front end of the high-temperature radiator, and the low-temperature cooling loop comprises a low-temperature radiator, a second electronic water pump, a battery heat exchanger, an air-conditioner water-cooling condenser, an inter-cooling water-cooling heat exchanger and a motor heat exchanger.
Chinese invention patent CN110067633a;
chinese invention patent CN109209606a;
Chinese invention patent CN108343500a;
chinese invention patent CN108930587a;
From the above, it can be found that the cooling system in the prior art does not consider the connection of the supercharger, the EGR cooler and other components in the large and small cycle, the cooling efficiency is low, and the problem of cooling after the engine is stopped cannot be solved.
Disclosure of Invention
The invention aims to provide a high-efficiency hybrid engine cooling system, which aims to solve the problems of low cooling efficiency and cooling after engine shutdown in the prior art.
In order to achieve the technical purpose and the technical effect, the invention is realized by the following technical scheme:
the invention provides a high-efficiency hybrid engine cooling system, which comprises:
The engine comprises a mechanical pump, a cylinder cover water jacket, an engine body water jacket, a supercharger cooling water channel, an EGR cooler, a temperature regulator, an engine oil cooler, a radiator, an electronic water pump and a one-way valve;
The water outlet of the mechanical pump is respectively communicated with the water inlet of the engine oil cooler and the water inlet of the cylinder cover water jacket through pipelines, and the water outlet of the cylinder cover water jacket is respectively communicated with the water inlet of the supercharger cooling water channel and the water inlet of the engine body water jacket through pipelines;
the water outlet of the cooling water channel of the supercharger is communicated with the water inlet of the EGR cooler through a pipeline; the water outlet of the EGR cooler and the water outlet of the engine oil cooler are communicated with the water inlet of the temperature regulator through pipelines;
The small circulation water outlet of the temperature regulator is communicated with the water inlet of the mechanical pump through a pipeline, the large circulation water outlet of the temperature regulator is communicated with the water inlet of the radiator through a pipeline, and the water outlet of the radiator is also communicated with the water inlet of the mechanical pump through a pipeline;
the water inlet of the electronic water pump is also communicated with the water inlet of the mechanical pump through a pipeline, the water outlet of the electronic water pump is communicated with the inlet of the one-way valve through a pipeline, and the outlet of the one-way valve is respectively communicated with the water inlet of the EGR cooler, the water outlet of the cooling water channel of the supercharger and the water outlet of the water jacket of the engine body through pipelines.
Preferably, the thermostat is a bellows thermostat or a wax thermostat.
Preferably, a fan is further arranged on the radiator.
The invention has the advantages that:
The high-efficiency hybrid engine cooling system provided by the invention designs a large and small circulating cooling system structure, has high cooling efficiency, adopts the combination of the mechanical pump and the electronic water pump, can still operate when in shutdown, can still effectively cool the engine body, the cylinder cover, the supercharger and the EGR cooler, cannot be accelerated and damaged due to waste heat, and keeps the operation reliability of the engine.
Drawings
FIG. 1 is a block diagram of a high efficiency hybrid engine cooling system according to the present disclosure;
FIG. 2 is a schematic diagram of a cooling circuit of the mechanical pump of the present invention in operation;
Fig. 3 is a schematic structural diagram of a cooling circuit of the electronic water pump in operation.
In the figure, 101 is a mechanical pump, 102 is a cylinder head water jacket, 103 is a machine body water jacket, 104 is a supercharger cooling water channel, 105 is a one-way valve, 106 is an EGR cooler, 107 is an engine oil cooler, 108 is a thermostat, 109 is a radiator, and 110 is an electronic water pump.
Detailed Description
For the purpose of making the technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail by way of specific embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In an embodiment of the present invention, there is provided a high efficiency hybrid engine cooling system, as shown in fig. 1, comprising: a mechanical pump 101 for delivering cooling water, a head water jacket 102 for cooling an engine head, a body water jacket 103 for cooling an engine body, a supercharger cooling water channel 104 for cooling a supercharger, an EGR cooler 106 for cooling EGR, a thermostat 108 for controlling a small cycle or a large cycle according to a temperature of the cooling water, an engine oil cooler 107 for cooling engine lubricating oil, a radiator 109 for providing cooling water radiation, an electronic water pump 110 for continuing to deliver the cooling water after the engine is stopped, and a check valve 105 for unidirectional delivery of the cooling water;
The water outlet of the mechanical pump 101 is respectively communicated with the water inlet of the engine oil cooler 107 and the water inlet of the cylinder head water jacket 102 through pipelines, and is used for leading part of cooling water to flow into the engine oil cooler 107 preferentially and inputting part of cooling water into the cylinder head water jacket 102; the water outlet of the cylinder cover water jacket 102 is respectively communicated with the water inlet of the supercharger cooling water channel 104 and the water inlet of the machine body water jacket 103 through pipelines, and cooling water flows into the supercharger cooling water channel 104 and the machine body water jacket 103 through the cylinder cover water jacket 102; the water outlet of the supercharger cooling water channel 104 and the water outlet of the engine body water jacket 103 are communicated with the water inlet of the EGR cooler 106 through pipelines, and cooling water is converged into the EGR cooler 106 from the supercharger cooling water channel 104 and the engine body water jacket 103; the water outlet of the EGR cooler 106 and the water outlet of the engine oil cooler 107 are communicated with the water inlet of the temperature regulator 108 through pipelines, and cooling water is gathered into the temperature regulator 108 from the EGR cooler 106 and the engine oil cooler 107 to enter circulation;
The small circulation water outlet of the temperature regulator 108 is communicated with the water inlet of the mechanical pump 101 through a pipeline, when the temperature of cooling water is at the primary opening threshold value of the temperature regulator 108, the cooling water flows back to the mechanical pump 101 through the temperature regulator 108 after being output by the mechanical pump 101 to realize small circulation, the large circulation water outlet of the temperature regulator 108 is communicated with the water inlet of the radiator 109 through a pipeline, when the temperature of the cooling water is at the full opening threshold value of the temperature regulator 108, the cooling water in the temperature regulator 108 flows through the water inlet of the radiator 109, the water outlet of the radiator 109 is also communicated with the water inlet of the mechanical pump 101 through a pipeline, and the cooling water flows back to the mechanical pump 101 through the radiator 109 after being output by the mechanical pump 101 to realize large circulation, so that the heat dissipation effect is further improved;
The water inlet of the electronic water pump 110 is also communicated with the water inlet of the mechanical pump 101 through a pipeline, the water outlet of the electronic water pump 110 is communicated with the inlet of the one-way valve 105 through a pipeline, and the outlet of the one-way valve 105 is respectively communicated with the water inlet of the EGR cooler 106, the water outlet of the booster cooling water channel 105 and the water outlet of the machine body water jacket 103 through pipelines; when the engine works, the electronic water pump 110 is not started, the mechanical pump 101 is used for conveying cooling water required by large and small circulation, and the cooling loop is shown in fig. 2; after the engine is stopped, the electronic water pump 110 can be interposed, the working state of the electronic water pump 110 is independent of the engine, and the cooling loop is shown in fig. 3, so that the electronic water pump 110 can be in the working state no matter whether the engine is started or stopped, the engine can still be operated when the engine is stopped, the engine body, the cylinder cover, the supercharger and the EGR cooler can still be effectively cooled, the engine can not be accelerated and damaged due to waste heat, and the operation reliability of the engine can be maintained; meanwhile, due to the arrangement of the check valve 105, when the mechanical pump 101 works, the cooling water loop does not pass through the electronic water pump 110 and the check valve 105 (shown in fig. 2), when the electronic water pump 110 works (shown in fig. 3), cooling water simultaneously flows into the EGR cooler 106, the booster cooling water channel 104 and the engine body water jacket 103 through the check valve 105, so that the cooling loop and the cooling priority are changed, namely, the engine body, the booster and the EGR cooler are cooled preferentially after the engine is stopped.
In one embodiment, the attemperator 108 is a bellows attemperator or a waxy attemperator.
In some embodiments, a fan is also disposed on the heat sink 109.
Reference in the specification to "some embodiments," "one embodiment," or "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in some embodiments," "in one embodiment," or "in an embodiment" in various places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, a particular feature, structure, or characteristic described in connection with or illustrated in one embodiment may be combined, in whole or in part, with features, structures, or characteristics of one or more other embodiments without limitation, provided that the combination is not non-logical or inoperable. Additionally, the various elements of the drawings are for illustrative purposes only and are not drawn to scale.
Having thus described several aspects of at least one embodiment of this invention, it is to be appreciated various alterations, modifications, and improvements will readily occur to those skilled in the art. Such alterations, modifications, and improvements are intended to be within the spirit and scope of the invention.
Claims (1)
1. A high efficiency hybrid engine cooling system, comprising:
The engine comprises a mechanical pump, a cylinder cover water jacket, an engine body water jacket, a supercharger cooling water channel, an EGR cooler, a temperature regulator, an engine oil cooler, a radiator, an electronic water pump and a one-way valve;
The water outlet of the mechanical pump is respectively communicated with the water inlet of the engine oil cooler and the water inlet of the cylinder cover water jacket through pipelines, and the water outlet of the cylinder cover water jacket is respectively communicated with the water inlet of the supercharger cooling water channel and the water inlet of the engine body water jacket through pipelines;
the water outlet of the cooling water channel of the supercharger is communicated with the water inlet of the EGR cooler through a pipeline; the water outlet of the EGR cooler and the water outlet of the engine oil cooler are communicated with the water inlet of the temperature regulator through pipelines;
The small circulation water outlet of the temperature regulator is communicated with the water inlet of the mechanical pump through a pipeline, the large circulation water outlet of the temperature regulator is communicated with the water inlet of the radiator through a pipeline, and the water outlet of the radiator is also communicated with the water inlet of the mechanical pump through a pipeline;
the water inlet of the electronic water pump is also communicated with the water inlet of the mechanical pump through a pipeline, the water outlet of the electronic water pump is communicated with the inlet of the one-way valve through a pipeline, and the outlet of the one-way valve is respectively communicated with the water inlet of the EGR cooler, the water outlet of the cooling water channel of the supercharger and the water outlet of the water jacket of the engine body through pipelines;
the temperature regulator is a bellows temperature regulator or a wax temperature regulator;
A fan is also arranged on the radiator;
The small circulation water outlet of the temperature regulator is communicated with the water inlet of the mechanical pump through a pipeline, when the temperature of cooling water is at the primary opening threshold value of the temperature regulator, the cooling water flows back to the mechanical pump through the temperature regulator after being output by the mechanical pump to realize small circulation, the large circulation water outlet of the temperature regulator is communicated with the water inlet of the radiator through a pipeline, when the temperature of the cooling water is at the full opening threshold value of the temperature regulator, the cooling water in the temperature regulator flows through the water inlet of the radiator, the water outlet of the radiator is also communicated with the water inlet of the mechanical pump through a pipeline, and the cooling water flows back to the mechanical pump through the radiator to realize large circulation after being output by the mechanical pump, so that the heat dissipation effect is further improved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010719520.3A CN111963294B (en) | 2020-07-23 | 2020-07-23 | Efficient hybrid engine cooling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010719520.3A CN111963294B (en) | 2020-07-23 | 2020-07-23 | Efficient hybrid engine cooling system |
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| Publication Number | Publication Date |
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| CN111963294A CN111963294A (en) | 2020-11-20 |
| CN111963294B true CN111963294B (en) | 2024-05-10 |
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| CN202010719520.3A Active CN111963294B (en) | 2020-07-23 | 2020-07-23 | Efficient hybrid engine cooling system |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113323748A (en) * | 2021-04-09 | 2021-08-31 | 重庆金康赛力斯新能源汽车设计院有限公司 | Engine thermal management method and system of extended-range automobile and automobile |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101655027A (en) * | 2009-09-08 | 2010-02-24 | 奇瑞汽车股份有限公司 | Engine cooling system and cooling method |
| KR20150076854A (en) * | 2013-12-27 | 2015-07-07 | (주)이코마린 | Closed cooling system for outboard engine |
| CN212671922U (en) * | 2020-07-23 | 2021-03-09 | 广西玉柴机器股份有限公司 | High-efficient thoughtlessly moves engine cooling system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE502006009008D1 (en) * | 2006-09-13 | 2011-04-14 | Ford Global Tech Llc | Coolant circuit |
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2020
- 2020-07-23 CN CN202010719520.3A patent/CN111963294B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101655027A (en) * | 2009-09-08 | 2010-02-24 | 奇瑞汽车股份有限公司 | Engine cooling system and cooling method |
| KR20150076854A (en) * | 2013-12-27 | 2015-07-07 | (주)이코마린 | Closed cooling system for outboard engine |
| CN212671922U (en) * | 2020-07-23 | 2021-03-09 | 广西玉柴机器股份有限公司 | High-efficient thoughtlessly moves engine cooling system |
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