CN109915249A - Car engine cooling system and its control method - Google Patents
Car engine cooling system and its control method Download PDFInfo
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- CN109915249A CN109915249A CN201910239263.0A CN201910239263A CN109915249A CN 109915249 A CN109915249 A CN 109915249A CN 201910239263 A CN201910239263 A CN 201910239263A CN 109915249 A CN109915249 A CN 109915249A
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- 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
Abstract
The invention discloses a kind of car engine cooling systems, including cylinder body water jacket, cylinder cover water jacket and radiator, the water outlet of radiator is connected respectively to the water inlet and the cooling branch water inlet end of machine oil of cylinder body water jacket by water pump, cylinder body water jacket water outlet is connected respectively to the cooling branch water inlet end of cylinder cover water jacket water inlet, EGR and the cooling branch water inlet end of booster, and the water outlet of cylinder cover water jacket is connected respectively to cylinder body water jacket water return outlet and coolant liquid supplement branch water inlet end；First water inlet is connect with the cooling branch water outlet EGR, and the second water inlet is connect with the cooling branch water outlet of machine oil, the water inlet connection of the first water outlet and water pump, and the water inlet of the second water outlet and radiator connects.The present invention also provides a kind of control method based on above-mentioned car engine cooling system, including shutdown mode, warming-up mode, underrun, heavy-duty service this four operating modes.The time of warming-up is greatly decreased in the present invention, and the control response time is short, avoids water temperature fluctuation.
Description
Technical field
The present invention relates to automobile cooling system technical fields, in particular to a kind of car engine cooling system and its control
Method.
Background technique
Engine water temperature is promoted rapidly and realizes that gray iron and machine oil are rapidly heated, and not only contributing to, which reduces engine, rubs
It wipes to reduce oil consumption, and advantageously reduces oil dilution risk.Conventional engines use thermostat control loop circuit, valve
Door realizes linkage using mechanical structure, and synchronization is only capable of closing and recycle all the way；And due to the physics of thermostat internal paraffin
Characteristic, volume expansion keeps the time of thermostat standard-sized sheet long after heating, even if electrical heating elements are added inside thermostat promotes stone
Wax heating, but thermostat wide-open time is still longer, can not achieve and quickly adjusts circulation branch road aperture.With oil consumption and exhaust method
Rule are constantly plus tight, and more and more engines recycle (EGR) technology using exhaust gas, but high-temp waste gas proposes EGR components
Strict requirements, especially take the high pressure EGR of exhaust gas before charger turbine, require components heatproof more harsh.
Chinese patent CN105257383A discloses a kind of engine-cooling system, after engine cold starting, thermostat
Although systemic circulation closing but partial circulating opening in the lower situation of temperature, coolant liquid is constantly in recurrent state in engine,
The cooled liquid band of the heat that combustion chamber generates is walked, and it is slow to will cause gray iron heating；When engine load is mutated, thermostat
Large and small circulation can not be switched rapidly, engine water temperature fluctuation is easily caused or even water temperature is more than engine limit value.
With Engine Downsizing development, coolant liquid in the cooling systems peripheral components such as expansion tank, warm-air exchanger
The ratio that Zhan always cools down liquid measure is higher and higher, and when warming-up, which controls this part coolant liquid and is not involved in circulation, can effectively reduce coolant liquid
It is heated total amount.In patent CN105257383A, expansion tank when warming-up, in warm-air exchanger coolant liquid always involved in following
Ring has an adverse effect to warm-up period is shortened.
Summary of the invention
Present invention aim to overcome above-mentioned the shortcomings of the prior art, when a kind of substantially shortening warming-up is provided
Between, avoid the car engine cooling system of coolant water temperature fluctuation.
To achieve the above object, the present invention provides a kind of car engine cooling system, it is characterised in that: including cylinder body water
Set, cylinder cover water jacket and radiator, the water outlet of the radiator are connected respectively to the water inlet and machine of cylinder body water jacket by water pump
The cooling branch water inlet end of oil, the cylinder body water jacket water outlet are connected respectively to the cooling branch water inlet end of cylinder cover water jacket filling pipe end, EGR
With the cooling branch water inlet end of booster, the collector nozzle of the cylinder cover water jacket is connected respectively to cylinder body water jacket water return outlet and coolant liquid is mended
Fill branch water inlet end；
Further include thermal management module, the thermal management module include the first water inlet, the second water inlet, the first water outlet and
Second water outlet, first water inlet are connect with the cooling branch water outlet the EGR, second water inlet and the machine oil
The water inlet connection of cooling branch water outlet connection, first water outlet and water pump, second water outlet and radiator
Water inlet connection.
Further, the water outlet of the radiator is also connected to the water inlet end of coolant liquid supplement branch, the coolant liquid
The water outlet of supplement branch is connected to solenoid valve one end, and the solenoid valve other end is connected to pump intake, the booster
The water outlet of cooling branch is connected to the water inlet of water pump.
Further, the cylinder body water jacket water outlet is equipped with the first water temperature sensor, and first water temperature sensor is another
End is connected to the water outlet of the cooling branch of EGR by cooling line, and the water outlet of the radiator is equipped with the second water temperature sensor.
Further, the cooling branch of the machine oil includes that the cooler for engine oil being sequentially connected in series and gearbox machine oil are cold
But device.
Further, the cooling branch of the EGR includes the EGR valve being sequentially connected in series and cooler for recycled exhaust gas.
Further, the cooling branch of the booster includes the auxiliary pump, booster and air throttle being sequentially connected in series.
Further, the coolant liquid supplement branch includes warm-air exchanger and expansion tank in parallel.
Further, first water inlet and second water inlet first merge into a channel, and the channel is another
End is connected to the first water outlet and the second water outlet respectively.
Based on car engine cooling system described in above-mentioned any one, the present invention also provides a kind of automobile engine is cold
But system control method, it is characterised in that: including shutdown mode, when engine misses are shut down, open water pump, auxiliary pump,
First water inlet, the second water inlet, the second water outlet and solenoid valve, close the first water outlet, and the cooling branch of machine oil and EGR are cooling
The cooling water of branch, which enters in radiator, to radiate, the cooling water in the cooling branch of booster and coolant liquid supplement branch
Flow back into cylinder body water jacket.
Based on car engine cooling system described in above-mentioned any one, the present invention also provides another automobile engines
Method for controlling cooling system, it is characterised in that: it further include warming-up mode, when engine cold-start, thermal management module and electromagnetism
Valve is turned off, and water pump and auxiliary pump are turned off, and the cooling water in system does not flow；Reach setting temperature to the first water temperature sensor
After degree, water pump, the first water inlet and the first water outlet are opened, cooling water is by flowing back into cylinder body water jacket after the cooling branch of EGR again
In, until the first water temperature sensor reaches warming-up temperature.
Based on car engine cooling system described in above-mentioned any one, the present invention also provides another automobile engines
Method for controlling cooling system, it is characterised in that: further include underrun mode, open water pump, auxiliary pump, the first water inlet
Mouth, the second water inlet, the first water outlet, the second water outlet and solenoid valve, the cooling water of the cooling branch of machine oil and the cooling branch of EGR
First collect in thermal management module, then a part flows back into cylinder body water jacket according to demand, and another part enters in radiator
Cooling, the cooling water in the cooling branch of booster and coolant liquid supplement branch flows back into cylinder body water jacket.
Based on car engine cooling system described in above-mentioned any one, the present invention also provides another automobile engines
Method for controlling cooling system, it is characterised in that: further include heavy-duty service mode, open water pump, auxiliary pump, the first water inlet
Mouth, the second water inlet, the second water outlet and solenoid valve close the first water outlet, and machine oil cools down branch and EGR cools down the cold of branch
But water enters cooling in radiator, and the cooling water in the cooling branch of booster and coolant liquid supplement branch flows back into cylinder body
Water jacket.
Beneficial effects of the present invention are as follows:
1, substantially shorten warm-up period.The present invention is when engine cold starts, water pump, auxiliary pump, thermal management module
It is turned off with solenoid valve, the cooling water in cylinder body water jacket and cylinder cover water jacket does not flow, is brought rapidly up engine, is then turned on
Partial circulating is further heated up to warming-up temperature, significantly reduces the time of warming-up in this way.
2, the control response time is short, coolant water temperature is avoided to fluctuate.Thermal management module and solenoid valve are electrically-controlled valve, in difference
Operating mode between can rapidly make and execute movement when switching, avoid because water temperature caused by switching not in time substantially
Fluctuation.
Detailed description of the invention
Fig. 1 is the transmitter cooling system schematic diagram of first embodiment of the invention.
Fig. 2 is the transmitter cooling system schematic diagram of second embodiment of the invention.
Each part numbers are as follows in figure: water pump 1, cylinder body water jacket 2, the pre- cold water jacket 301 of cylinder cover water jacket 3, EGR, EGR valve 4,
Cooler for recycled exhaust gas 5, warm-air exchanger 6, auxiliary pump 7, booster 8, thermal management module 9, the first water inlet 901, the second water inlet
902, the first water outlet 903, the second water outlet 904, solenoid valve 10, cooler for engine oil 11, radiator 12, expansion tank
13, gearbox oil cooler 14, air throttle 15, the first water temperature sensor 19, the second water temperature sensor 20.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing, convenient for more clearly understanding the present invention, but they
Limiting the invention.
Embodiment one: as shown in Figure 1, the present invention provides a kind of car engine cooling system, it is characterised in that: including cylinder
Body water jacket 2, cylinder cover water jacket 3 and radiator 12, the water outlet of radiator 12 by water pump 1 be connected respectively to cylinder body water jacket 2 into
The mouth of a river and the cooling branch water inlet end of machine oil, 2 water outlet a part of cylinder body water jacket are flowed into cylinder cover water jacket 3 by cylinder cap filling pipe end
In, remainder separately flows into the cooling branch water inlet end of EGR and the cooling branch water inlet end of booster, the collector nozzle of cylinder cover water jacket 3
It is connected respectively to 2 water return outlet of cylinder body water jacket and coolant liquid supplement branch water inlet end；
It further include thermal management module 9, thermal management module 9 includes the first water inlet 901, the water outlet of the second water inlet 902, first
Mouth 903 and the second water outlet 904, the first water inlet 901 and the second water inlet 902 are separately connected again after first merging into a channel
To the first water outlet 903 and the second water outlet 904, the aperture of each water inlet or water outlet is controlled by control motor, and first
Water inlet 901 is connect with the cooling branch water outlet EGR, and the second water inlet 902 is connect with the cooling branch water outlet of machine oil, and first goes out
The mouth of a river 903 is connect with the water inlet of water pump 1, and the second water outlet 904 is connect with the water inlet of radiator 12；First water inlet 901
A channel is first merged into the second water inlet 902, is then connected to respectively with the first water outlet 903 and the second water outlet 904.
The water outlet of radiator 12 is also connected to the water inlet end of coolant liquid supplement branch, and coolant liquid supplements the water outlet of branch
It is connected to 10 one end of solenoid valve, 10 other end of solenoid valve is connected to 1 water inlet of water pump, and solenoid valve 10 is open type, and booster is cold
But the water outlet of branch is connected to the water inlet of water pump 1.
In above-mentioned technical proposal, 2 water outlet of cylinder body water jacket is equipped with the first water temperature sensor 19, and the first water temperature sensor 19 is another
One end is connected to the water outlet of the cooling branch of EGR by cooling line, and the water outlet of radiator 12 is equipped with the second water temperature sensor
20.In this way, the water temperature of the first water temperature sensor 19 monitoring 2 water outlet of cylinder body water jacket, judges whether engine reaches warm with this
Machine temperature, water temperature of the second water temperature sensor 20 monitoring after the heat dissipation of radiator 12.
In above-mentioned technical proposal, the cooling branch of machine oil includes cooler for engine oil 11, cooler for engine oil pair
Engine motor oil is cooled down；The cooling branch of EGR includes the EGR valve 4 being sequentially connected in series and cooler for recycled exhaust gas 5, is flowed out from cylinder body water jacket
Coolant liquid successively cool down EGR valve and flow through the EGR gas of cooler for recycled exhaust gas；The cooling branch of booster includes being sequentially connected in series
Auxiliary pump 7 and booster 8, auxiliary pump provide the mobilization dynamic of the cooling branch of booster and increase coolant rate, make cold
But the preferably cooling booster of liquid；Coolant liquid supplement branch includes warm-air exchanger 6 and expansion tank 13 in parallel, from cylinder head water
The coolant temperature highest for covering outflow, is most suitable for providing heat for interior heating, when car needs to heat, solenoid valve can be low
It is switched on when warming-up temperature, interior heating needs should be paid the utmost attention at this time.
Embodiment two: as shown in Fig. 2, as a preferred embodiment, on the basis of above-described embodiment one, machine oil is cooling
Branch includes the cooler for engine oil 11 being sequentially connected in series and gearbox oil cooler 14, the cooling branch of booster include according to
Secondary concatenated auxiliary pump 7, booster 8 and air throttle 15.In this way, the temperature of gearbox machine oil and air throttle can be further decreased
Degree improves use reliability.
The course of work of car engine cooling system of the invention, including following four kinds of operating modes:
Warming-up mode: when engine just starts, the temperature of engine and its attachment is very low, is badly in need of being brought rapidly up, heat management
Module 9 and solenoid valve 10 are turned off, and water pump 1 and auxiliary pump 7 are turned off, and the cooling water in system does not flow, and can be realized cylinder
Body metal is rapidly heated, and engine friction loss is effectively reduced；When water temperature rises to the set temperature less than warming-up temperature, open
Water pump 1, the first water inlet 901 and the first water outlet 903 are opened, cooling water is by flowing back into cylinder body water jacket 2 after the cooling branch of EGR again
In, cooling system is partial circulating at this time, until engine reaches warming-up temperature.
Underrun: the temperature of engine and its attachment is relatively high, needs certain cooling, opens water pump 1, auxiliary water
The 7, first water inlet 901, the second water inlet 902, the first water outlet 903, the second water outlet 904 and solenoid valve 10 are pumped, machine oil is cold
But the cooling water of branch and the cooling branch of EGR first converges in thermal management module 9, and then a part flows back into cylinder body according to demand
In water jacket 2, for maintaining the temperature of engine, another part enters cooling in radiator 12, the cooling branch of booster and cooling
Cooling water in liquid supplement branch flows back into cylinder body water jacket 2, passes through control the first water outlet of thermal management module and the
The openings of sizes of two water outlets is realized to control the coolant rate for flowing separately through radiator and flowing back into cylinder body water jacket
Engine operation promotes the thermal efficiency in higher temperature levels.
Heavy-duty service: the temperature of engine and its attachment is very high, needs a large amount of cooling, opens water pump 1, auxiliary pump
7, the first water inlet 901, the second water inlet 902, the second water outlet 904 and solenoid valve 10 close the first water outlet 903, machine oil
The cooling water of cooling branch and the cooling branch of EGR enters cooling in radiator 12, reduces the temperature of coolant liquid, booster is cooling
Cooling water in branch and coolant liquid supplement branch flows back into cylinder body water jacket 2.Realize the maximum heat-sinking capability of cooling system,
Guarantee that engine temperature does not exceed limit value.
Shutdown mode: when engine just stops working, the temperature of engine and its attachment is still very high, opens water pump 1, auxiliary
Water pump 7, the first water inlet 901, the second water inlet 902, the second water outlet 904 and solenoid valve 10 close the first water outlet 903,
Cooling system is systemic circulation at this time, the cooling water of the cooling branch of machine oil and the cooling branch of EGR enter in radiator 12 carry out it is scattered
The cooling water that heat, the cooling branch of booster and coolant liquid are supplemented in branch flows back into cylinder body water jacket 2.
Claims (12)
1. a kind of car engine cooling system, it is characterised in that: including cylinder body water jacket (2), cylinder cover water jacket (3) and radiator
(12), the water outlet of the radiator (12) is connected respectively to water inlet and the machine oil cooling of cylinder body water jacket (2) by water pump (1)
Branch water inlet end, cylinder body water jacket (2) water outlet are connected respectively to the cooling branch water inlet end of cylinder cover water jacket (3) filling pipe end, EGR
With the cooling branch water inlet end of booster, the collector nozzle of the cylinder cover water jacket (3) is connected respectively to cylinder body water jacket (2) water return outlet and cold
But liquid supplements branch water inlet end；
Further include thermal management module (9), the thermal management module (9) include the first water inlet (901), the second water inlet (902),
The cooling branch water outlet first water outlet (903) and the second water outlet (904), first water inlet (901) and the EGR connects
It connects, second water inlet (902) connect with the cooling branch water outlet of the machine oil, first water outlet (903) and water pump
(1) water inlet connection, second water outlet (904) connect with the water inlet of radiator (12).
2. car engine cooling system according to claim 1, it is characterised in that: the water outlet of the radiator (12)
It is also connected to the water inlet end of coolant liquid supplement branch, the water outlet of the coolant liquid supplement branch is connected to solenoid valve (10) one
End, solenoid valve (10) other end are connected to water pump (1) water inlet, and the water outlet of the cooling branch of the booster is connected to water
Pump the water inlet of (1).
3. car engine cooling system according to claim 1, it is characterised in that: cylinder body water jacket (2) water outlet
Equipped with the first water temperature sensor (19), the first water temperature sensor (19) other end is connected to EGR cooling by cooling line
The water outlet of the water outlet of branch, the radiator (12) is equipped with the second water temperature sensor (20).
4. car engine cooling system according to claim 1, it is characterised in that: the cooling branch of the machine oil include according to
Secondary concatenated cooler for engine oil (11) and gearbox oil cooler (14).
5. car engine cooling system according to claim 1, it is characterised in that: the cooling branch of the EGR include according to
Secondary concatenated EGR valve (4) and cooler for recycled exhaust gas (5).
6. car engine cooling system according to claim 1, it is characterised in that: the booster cools down branch and includes
Auxiliary pump (7), booster (8) and the air throttle (15) being sequentially connected in series.
7. car engine cooling system according to claim 1, it is characterised in that: the coolant liquid supplements branch and includes
Warm-air exchanger (6) and expansion tank (13) in parallel.
8. car engine cooling system according to claim 1, it is characterised in that: first water inlet (901) and
Second water inlet (902) is connected to the first water outlet (903) and the second water outlet (904) simultaneously.
9. a kind of control method based on car engine cooling system described in 1~8 any one of the claims, special
Sign is: including warming-up mode, when engine cold-start, thermal management module (9) and solenoid valve (10) are turned off, water pump (1)
It is turned off with auxiliary pump (7), the cooling water in system does not flow；After the first water temperature sensor (19) reaches set temperature,
Water pump (1), the first water inlet (901) and the first water outlet (903) are opened, cooling water after the cooling branch of EGR by flowing back into again
In cylinder body water jacket (2), until the first water temperature sensor (19) reaches warming-up temperature.
10. a kind of control method based on car engine cooling system described in 1~8 any one of the claims,
Be characterized in that: further including underrun mode, open water pump (1), auxiliary pump (7), the first water inlet (901), second into
The mouth of a river (902), the first water outlet (903), the second water outlet (904) and solenoid valve (10), the cooling branch of machine oil and the cooling branch of EGR
The cooling water on road first collects in thermal management module (9), and then a part flows back into cylinder body water jacket (2) according to demand, another
Part enters cooling in radiator (12), and the cooling water in the cooling branch of booster and coolant liquid supplement branch flows back into cylinder
In body water jacket (2).
11. a kind of control method based on car engine cooling system described in 1~8 any one of the claims,
Be characterized in that: further including includes heavy-duty service mode, opens water pump (1), auxiliary pump (7), the first water inlet (901), the
Two water inlets (902), the second water outlet (904) and solenoid valve (10) are closed the first water outlet (903), the cooling branch of machine oil and
The cooling water of the cooling branch of EGR enters cooling in radiator (12), and the cooling branch of booster and coolant liquid are supplemented in branch
Cooling water flow back into cylinder body water jacket (2).
12. a kind of control method based on car engine cooling system described in 1~8 any one of the claims,
It is characterized in that: further including shutdown mode, when engine misses are shut down, open water pump (1), auxiliary pump (7), the first water inlet
(901), the second water inlet (902), the second water outlet (904) and solenoid valve (10) are closed the first water outlet (903), and machine oil is cold
But the cooling water of branch and the cooling branch of EGR, which enters in radiator (12), radiates, the cooling branch of booster and coolant liquid
Cooling water in supplement branch flows back into cylinder body water jacket (2).
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| CN201910239263.0A CN109915249B (en) | 2019-03-27 | 2019-03-27 | Automobile engine cooling system and control method thereof |
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| CN201910239263.0A CN109915249B (en) | 2019-03-27 | 2019-03-27 | Automobile engine cooling system and control method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111396186A (en) * | 2020-04-16 | 2020-07-10 | 昆明云内动力股份有限公司 | Split type cooling system and method for engine |
| CN111691966A (en) * | 2020-06-16 | 2020-09-22 | 安徽江淮汽车集团股份有限公司 | Engine cooling system |
| CN111878209A (en) * | 2020-07-23 | 2020-11-03 | 广西玉柴机器股份有限公司 | Efficient hybrid engine cooling system and engine cooling method |
| CN111963297A (en) * | 2020-08-31 | 2020-11-20 | 东风汽车集团有限公司 | Gasoline engine heat management strategy method based on switch type water pump-auxiliary water pump |
| CN111963293A (en) * | 2020-07-23 | 2020-11-20 | 广西玉柴机器股份有限公司 | High-efficient thoughtlessly moves engine cooling system |
| CN112177755A (en) * | 2020-09-30 | 2021-01-05 | 东风汽车集团有限公司 | Gasoline engine double-ball thermal management optimization method capable of controlling EGR cooling flow |
| CN113530635A (en) * | 2021-08-25 | 2021-10-22 | 中国第一汽车股份有限公司 | Engine cooling system and car |
| CN115217573A (en) * | 2022-02-15 | 2022-10-21 | 广州汽车集团股份有限公司 | Engine oil conveying system and engine oil temperature control method |
| CN115370458A (en) * | 2021-05-18 | 2022-11-22 | 广州汽车集团股份有限公司 | Engine cooling system, engine cooling method, vehicle control system, vehicle, and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111878209A (en) * | 2020-07-23 | 2020-11-03 | 广西玉柴机器股份有限公司 | Efficient hybrid engine cooling system and engine cooling method |
| CN111963293A (en) * | 2020-07-23 | 2020-11-20 | 广西玉柴机器股份有限公司 | High-efficient thoughtlessly moves engine cooling system |
| CN111878209B (en) * | 2020-07-23 | 2023-08-08 | 广西玉柴机器股份有限公司 | Efficient hybrid engine cooling system and engine cooling method |
| CN111963297A (en) * | 2020-08-31 | 2020-11-20 | 东风汽车集团有限公司 | Gasoline engine heat management strategy method based on switch type water pump-auxiliary water pump |
| CN112177755A (en) * | 2020-09-30 | 2021-01-05 | 东风汽车集团有限公司 | Gasoline engine double-ball thermal management optimization method capable of controlling EGR cooling flow |
| CN115370458A (en) * | 2021-05-18 | 2022-11-22 | 广州汽车集团股份有限公司 | Engine cooling system, engine cooling method, vehicle control system, vehicle, and storage medium |
| CN115370458B (en) * | 2021-05-18 | 2023-08-15 | 广州汽车集团股份有限公司 | Engine cooling system, method, vehicle control system, vehicle and storage medium |
| CN113530635B (en) * | 2021-08-25 | 2022-09-16 | 中国第一汽车股份有限公司 | Engine cooling system and car |
| CN113530635A (en) * | 2021-08-25 | 2021-10-22 | 中国第一汽车股份有限公司 | Engine cooling system and car |
| CN115217573A (en) * | 2022-02-15 | 2022-10-21 | 广州汽车集团股份有限公司 | Engine oil conveying system and engine oil temperature control method |
| CN115217573B (en) * | 2022-02-15 | 2024-01-23 | 广州汽车集团股份有限公司 | Engine oil conveying system and engine oil temperature control method |
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