CN114562358B - Power assembly cooling system, cooling control method and automobile - Google Patents

Power assembly cooling system, cooling control method and automobile Download PDF

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Publication number
CN114562358B
CN114562358B CN202210182360.2A CN202210182360A CN114562358B CN 114562358 B CN114562358 B CN 114562358B CN 202210182360 A CN202210182360 A CN 202210182360A CN 114562358 B CN114562358 B CN 114562358B
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China
Prior art keywords
cooling liquid
cooling
heat exchanger
radiator
temperature range
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CN202210182360.2A
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Chinese (zh)
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CN114562358A (en
Inventor
王红
邓伟
蒋继科
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Chongqing Changan Automobile Co Ltd
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Chongqing Changan Automobile Co Ltd
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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/02—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant
    • B60H1/04—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant from cooling liquid of the plant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K11/00—Arrangement in connection with cooling of propulsion units
    • B60K11/02—Arrangement in connection with cooling of propulsion units with liquid cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K11/00—Arrangement in connection with cooling of propulsion units
    • B60K11/02—Arrangement in connection with cooling of propulsion units with liquid cooling
    • B60K11/04—Arrangement or mounting of radiators, radiator shutters, or radiator blinds
    • 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
    • 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
    • F01M5/02—Conditioning lubricant for aiding engine starting, e.g. heating
    • F01M5/021—Conditioning lubricant for aiding engine starting, e.g. heating by heating
    • 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
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/14—Indicating devices; Other safety devices
    • F01P11/16—Indicating devices; Other safety devices concerning coolant temperature
    • 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
    • F01P3/02—Arrangements for cooling cylinders or cylinder heads
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0412—Cooling or heating; Control of temperature
    • F16H57/0413—Controlled cooling or heating of lubricant; Temperature control therefor
    • 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)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Details Of Gearings (AREA)

Abstract

The invention provides a power assembly cooling system, a control method and an automobile, wherein the system comprises the following components: a water pump; a cylinder block water jacket and a cylinder head water jacket which are communicated with a liquid outlet of the water pump and are arranged in parallel; the thermostat assembly is communicated with the liquid outlet of the cylinder head water jacket and is communicated with the liquid outlet of the cylinder block water jacket through a fifth thermostat; the warm air core body, the engine oil heat exchanger, the transmission oil heat exchanger and the radiator are respectively communicated with a plurality of liquid outlets of the thermostat assembly, and the liquid outlets of the warm air core body, the engine oil heat exchanger, the transmission oil heat exchanger and the radiator are all communicated to the liquid inlet of the water pump; a fan for supplying cooling air for cooling the cooling liquid in the radiator is arranged side by side with the radiator.

Description

Power assembly cooling system, cooling control method and automobile
Technical Field
The invention relates to the field of power assembly cooling control of motor vehicles, in particular to a power assembly cooling system, a cooling control method and an automobile.
Background
With the increasing requirements of fuel consumption and emission regulations, an engine is used as a core component of a vehicle, and the improvement of the thermal efficiency and the emission of the engine are imperative. The energy released by the combustion of the fuel is partly used for doing useful work, partly used as exhaust gas to be discharged, partly used for mechanical friction loss and partly taken away by a cooling system. So increasing the level of thermal management of the cooling system is critical to increasing the thermal efficiency of the engine. A typical powertrain cooling system includes: parts such as a water pump, a cylinder body water jacket, a cylinder head water jacket, a thermostat, a water temperature sensor and the like, and some types include an engine oil heat exchanger and a transmission oil heat exchanger, and some types do not.
The cooling system of the general power assembly only controls the highest water temperature during the maximum load, ensures that the local temperature of important parts such as a cylinder body, a cylinder cover and the like does not exceed the standard, and ensures the reliability. The cooling strategy at cold start and non-maximum load conditions is not studied and controlled, resulting in energy waste.
Disclosure of Invention
In view of the above, the present invention aims to provide a powertrain cooling system, a cooling control method, and an automobile for solving the problems of how to rapidly heat an engine body, an engine coolant, engine oil, and transmission oil, and what temperature is most favorable for fuel consumption and emission in a sequential heating order when the automobile is under a cold start condition; and the temperature of cooling liquid with lower energy consumption is controlled by the fan in the process of climbing, low-speed and high-speed running after the vehicle is warmed up.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the invention provides a power assembly cooling system, comprising:
a water pump;
a cylinder body water jacket and a cylinder head water jacket (3) which are communicated with a liquid outlet of the water pump and are arranged in parallel;
the thermostat assembly is communicated with a liquid outlet of the cylinder head water jacket (3) and is communicated with a liquid outlet of the cylinder block water jacket through a fifth thermostat;
the warm air core body, the engine oil heat exchanger, the transmission oil heat exchanger and the radiator are respectively communicated with a plurality of liquid outlets of the thermostat assembly, and the liquid outlets of the warm air core body, the engine oil heat exchanger, the transmission oil heat exchanger and the radiator are all communicated to the liquid inlet of the water pump;
a fan for supplying cooling air for cooling the cooling liquid in the radiator is arranged side by side with the radiator.
Preferably, the thermostat assembly includes a first thermostat in communication with the warm air core, a second thermostat in communication with the engine oil heat exchanger, a third thermostat in communication with the transmission oil heat exchanger, and a fourth thermostat in communication with the radiator.
Preferably, the powertrain cooling system further comprises: a water temperature sensor disposed within the thermostat assembly.
Preferably, when the outside environment temperature indicates that the engine is in a cold start condition, performing:
when the temperature detected by the water temperature sensor indicates that the temperature of the cooling liquid is lower than the lowest value of a first preset temperature range, controlling the fifth thermostat and the thermostat assembly to be closed;
when the temperature detected by the water temperature sensor indicates that the temperature of the cooling liquid is in a first preset temperature range, controlling the thermostat assembly to only conduct the warm air core, and enabling the cooling liquid to flow to the warm air core to defrost, defog and/or heat the cockpit;
when the temperature detected by the water temperature sensor indicates that the temperature of the cooling liquid is in a second preset temperature range, controlling the thermostat assembly to conduct the warm air core and the engine oil heat exchanger, enabling the cooling liquid to flow to the warm air core for defrosting, defogging and/or heating the cockpit, and further heating engine oil through the engine oil heat exchanger;
when the temperature detected by the water temperature sensor indicates that the temperature of the cooling liquid is in a third preset temperature range, the thermostat assembly is controlled to conduct the warm air core, the engine oil heat exchanger and the transmission oil heat exchanger, the cooling liquid flows to the warm air core to defrost, defog and/or heat the cockpit, the cooling liquid heats engine oil through the engine oil heat exchanger, and the cooling liquid further heats transmission oil through the transmission oil heat exchanger; or (b)
When the temperature detected by the water temperature sensor indicates that the temperature of the cooling liquid is in a fourth preset temperature range, controlling a warm air core, an engine oil heat exchanger, a transmission oil heat exchanger and a fifth thermostat to be opened, enabling the cooling liquid pumped by a water pump to flow to the thermostat assembly through a water jacket of a cylinder head and a water jacket of a cylinder body at the same time, enabling the cooling liquid to flow to the warm air core for defrosting, defogging and/or heating a cockpit, enabling the cooling liquid to heat engine oil through the engine oil heat exchanger, and enabling the cooling liquid to further heat the transmission oil through the transmission oil heat exchanger;
the first preset temperature range, the second preset temperature range, the third preset temperature range and the fourth preset temperature range are sequentially increased.
Preferably, when the engine is in a warm-up condition, the following is performed:
when the temperature detected by the water temperature sensor indicates that the temperature of the cooling liquid is in a fifth preset temperature range, controlling the thermostat assembly to conduct a radiator, and cooling the cooling liquid through the radiator;
when the temperature detected by the water temperature sensor indicates that the temperature of the cooling liquid is in a sixth preset temperature range, controlling the thermostat assembly to conduct the radiator and controlling the fan on one side of the radiator to be started, cooling the cooling liquid further through the radiator, and cooling the cooling liquid in the radiator by cooling air provided by the fan;
when the temperature detected by the water temperature sensor indicates that the temperature of the cooling liquid is in a seventh preset temperature range, controlling the thermostat assembly to conduct the radiator, the transmission oil heat exchanger and controlling the fan on one side of the radiator to be started, cooling the transmission oil through the transmission oil heat exchanger, cooling the cooling liquid further through the radiator, and cooling the cooling liquid in the radiator by cooling air provided by the fan; or (b)
When the temperature detected by the water temperature sensor indicates that the temperature of the cooling liquid is higher than the maximum value of a seventh preset temperature range, controlling the thermostat assembly to conduct the radiator, the transmission oil heat exchanger, the engine oil heat exchanger and a fan on one side of the radiator to be started, cooling the cooling liquid further through the radiator, cooling the engine oil through the engine oil heat exchanger, and cooling the cooling liquid in the radiator by cooling air provided by the fan;
the fifth preset temperature range is higher than the fourth preset temperature range, and the fifth preset temperature range, the sixth preset temperature range, and the seventh preset temperature range are sequentially increased.
The invention also provides a power assembly cooling control method, which is applied to the power assembly cooling system and comprises the following steps:
collecting the temperature of the outside environment of the vehicle, and judging whether the engine is in a cold start working condition;
when the outside environment temperature indicates that the engine is in a cold start condition, performing:
when the temperature detected by the water temperature sensor indicates that the temperature of the cooling liquid is lower than the lowest value of a first preset temperature range, controlling the fifth thermostat and the thermostat assembly to be closed;
when the temperature detected by the water temperature sensor indicates that the temperature of the cooling liquid is in a first preset temperature range, controlling the thermostat assembly to only conduct the warm air core, and enabling the cooling liquid to flow to the warm air core to defrost, defog and/or heat the cockpit;
when the temperature detected by the water temperature sensor indicates that the temperature of the cooling liquid is in a second preset temperature range, controlling the thermostat assembly to conduct the warm air core and the engine oil heat exchanger, enabling the cooling liquid to flow to the warm air core for defrosting, defogging and/or heating the cockpit, and further heating engine oil through the engine oil heat exchanger;
when the temperature detected by the water temperature sensor indicates that the temperature of the cooling liquid is in a third preset temperature range, the thermostat assembly is controlled to conduct the warm air core, the engine oil heat exchanger and the transmission oil heat exchanger, the cooling liquid flows to the warm air core to defrost, defog and/or heat the cockpit, the cooling liquid heats engine oil through the engine oil heat exchanger, and the cooling liquid further heats transmission oil through the transmission oil heat exchanger; or (b)
When the temperature detected by the water temperature sensor indicates that the temperature of the cooling liquid is in a fourth preset temperature range, controlling a warm air core, an engine oil heat exchanger, a transmission oil heat exchanger and a fifth thermostat to be opened, enabling the cooling liquid pumped by a water pump to flow to the thermostat assembly through a water jacket of a cylinder head and a water jacket of a cylinder body at the same time, enabling the cooling liquid to flow to the warm air core for defrosting, defogging and/or heating a cockpit, enabling the cooling liquid to heat engine oil through the engine oil heat exchanger, and enabling the cooling liquid to further heat the transmission oil through the transmission oil heat exchanger;
the first preset temperature range, the second preset temperature range, the third preset temperature range and the fourth preset temperature range are sequentially increased.
Preferably, if the engine is not in the cold start condition, judging whether the engine is in the warm-up condition;
when the temperature detected by the water temperature sensor indicates that the temperature of the cooling liquid is in a fifth preset temperature range, controlling the thermostat assembly to conduct a radiator, and cooling the cooling liquid through the radiator;
when the temperature detected by the water temperature sensor indicates that the temperature of the cooling liquid is in a sixth preset temperature range, controlling the thermostat assembly to conduct the radiator and controlling the fan on one side of the radiator to be started, cooling the cooling liquid further through the radiator, and cooling the cooling liquid in the radiator by cooling air provided by the fan;
when the temperature detected by the water temperature sensor indicates that the temperature of the cooling liquid is in a seventh preset temperature range, controlling the thermostat assembly to conduct the radiator, the transmission oil heat exchanger and controlling the fan on one side of the radiator to be started, cooling the transmission oil through the transmission oil heat exchanger, cooling the cooling liquid further through the radiator, and cooling the cooling liquid in the radiator by cooling air provided by the fan; or (b)
When the temperature detected by the water temperature sensor indicates that the temperature of the cooling liquid is higher than the maximum value of a seventh preset temperature range, controlling the thermostat assembly to conduct the radiator, the transmission oil heat exchanger, the engine oil heat exchanger and a fan on one side of the radiator to be started, cooling the cooling liquid further through the radiator, cooling the engine oil through the engine oil heat exchanger, and cooling the cooling liquid in the radiator by cooling air provided by the fan;
the fifth preset temperature range is higher than the fourth preset temperature range, and the fifth preset temperature range, the sixth preset temperature range, and the seventh preset temperature range are sequentially increased.
The embodiment of the invention also provides an automobile comprising the power assembly cooling system.
Compared with the prior art, the cooling system provided by the invention has the following advantages:
at cold start, the cylinder block water jacket and the cylinder head water jacket are approximately zero flow. The cylinder body and the cylinder body can be heated up rapidly, friction loss is reduced, the thermal efficiency of the engine is improved, and emission is reduced.
Because the cylinder body water jacket and the cylinder head water jacket are cooled in parallel, the switching and flow of the cylinder body water jacket and the cylinder head water jacket can be controlled separately due to the non-traditional serial cooling structure. The energy flow control is more accurate, and the thermal efficiency of the engine is further improved.
During cold start, engine oil is heated through the second loop, so that the temperature of the engine oil is increased, the viscosity of the engine oil is quickly reduced, and friction loss is reduced; when the temperature of engine oil is too high, the engine oil is cooled through the second loop, so that lubrication is prevented from being influenced by the too high temperature of the engine oil.
When the engine is cold, the transmission engine oil is heated through the third loop, so that the transmission engine oil is increased, the temperature viscosity is quickly reduced, and the friction loss is reduced; the transmission oil is cooled by the third circuit when the temperature of the transmission oil is too high. The lubrication is prevented from being influenced by the too high temperature of the engine oil of the transmission.
And the first loop formed by the warm air core, the second loop formed by the engine oil heat exchanger, the third loop formed by the transmission oil heat exchanger, the fourth loop formed by the radiator, the cylinder body water jacket, the cylinder cover water jacket and the radiator fan are taken into consideration as a system overall, so that the heat management efficiency of the power assembly is improved more comprehensively and systematically.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of a powertrain cooling system according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a powertrain cooling system control strategy according to an embodiment of the present disclosure;
FIG. 3 is a schematic illustration of the operation of a first thermostat according to an embodiment of the present invention;
FIG. 4 is a schematic illustration of the operation of the first thermostat and the second thermostat in an embodiment of the present invention;
FIG. 5 is a schematic diagram showing the operation of the first thermostat to the third thermostat with the fifth thermostat closed in the embodiment of the present invention;
FIG. 6 is a schematic diagram showing the operation of the first thermostat to the third thermostat when the fifth thermostat is opened in the embodiment of the present invention;
FIG. 7 is a schematic diagram of the operation of the first thermostat to the fifth thermostat in the embodiment of the present invention;
reference numerals illustrate:
1-water pump, 2-cylinder body water jacket, 3-cylinder head water jacket, 4-warm air core, 5-thermostat housing, 61-first thermostat, 62-second thermostat, 63-third thermostat, 64-fourth thermostat, 65-fifth thermostat, 7-water temperature sensor, 8-engine oil heat exchanger, 9-transmission oil heat exchanger, 10-radiator, 11-fan.
Detailed Description
The invention will be described in detail below with reference to the drawings in connection with embodiments.
FIG. 1 is a schematic diagram of a powertrain cooling system according to an embodiment of the present invention; the system comprises: the water pump 1, the cylinder block water jacket 2, the cylinder head water jacket 3, the warm air core 4, the thermostat housing 5, the first thermostat 61, the second thermostat 62, the third thermostat 63, the fourth thermostat 64, the fifth thermostat 65, the water temperature sensor 7, the engine oil heat exchanger 8, the transmission oil heat exchanger 9, the radiator 10, the fan 11.
Wherein the first thermostat 61, the second thermostat 62, the third thermostat 63 and the fourth thermostat 64 together form a thermostat assembly.
The water pump 1 is arranged at one end of the cylinder body water jacket 2 and the cylinder head water jacket 3 and is connected with the cylinder body water jacket.
The fifth thermostat 65 is arranged at the other end of the cylinder body water jacket 2 and controls the circulation of the cylinder body water jacket 2; the coolant of the cylinder block water jacket 2 passes through the fifth thermostat 65 and then merges with the coolant of the cylinder head water jacket 3, and enters the thermostat housing 5 of the thermostat assembly.
The front end of the thermostat shell 5 is provided with a water temperature sensor 7; the water temperature sensor 7 is used to measure the temperature of the coolant in the cylinder block water jacket 2 and the cylinder head water jacket 3.
The thermostat housing 5 is provided at the rear end thereof with a first thermostat 61, a second thermostat 62, a third thermostat 63, and a fourth thermostat 64.
In the embodiment of the invention, the air conditioner also comprises a warm air core body 4;
one end of the warm air core body 4 is connected with the first thermostat 61, the other end is connected with the water pump 1 to form a first loop, the warm air core body 4 is required to be started to defrost, defog, heat and the like usually in colder weather, the first thermostat 61 controls the circulation of the first loop, and after the first thermostat 61 is started, the cooling liquid provides heat for the warm air core body 4;
one end of the engine oil heat exchanger 8 is connected with the second thermostat 62, and the other end is connected with the water pump 1 to form a second loop, and the second thermostat 62 controls the circulation of the second loop; the second thermostat 62 opens and the coolant circulates through the second circuit, and exchanges heat, i.e., heats or cools, the engine oil.
One end of the transmission oil heat exchanger 9 is connected with a third thermostat 63, and the other end is connected with the water pump 1 to form a third loop, and the third thermostat controls the circulation of the third loop; after the third thermostat 63 is opened, the coolant circulates through the third circuit, and the transmission oil is subjected to heat exchange, i.e., heating or cooling.
One end of the radiator 10 is connected with a fourth thermostat 64, the other end is connected with a water pump 1 to form a fourth loop, and the fourth thermostat 64 controls the circulation of the fourth loop; the fourth thermostat 64 opens and the coolant circulates through the fourth circuit.
The fan 11 is disposed in parallel with the radiator 10, and the cooling liquid in the radiator 10 is cooled by the air blown out from the fan 11.
As shown in FIG. 2, a flow chart of a powertrain cooling control strategy according to an embodiment of the present invention is shown, wherein the strategy includes the following conditions.
Firstly, when the ambient temperature is 40 ℃ below zero to 20 ℃ and the engine is in a cold start working condition, the following 6 working conditions are executed:
in the working condition 1, the engine is in a cold starting working condition, the five thermostats are in a closed state, and the cooling liquid of the cylinder body water jacket 2 and the cylinder head water jacket 3 is nearly zero in flow.
Namely, the cylinder body water jacket 2, the cylinder head water jacket 3, the warm air core 4, the engine oil heat exchanger 8, the transmission oil heat exchanger 9 and the cooling liquid in the radiator 10 are almost zero flow. Only a small amount of coolant flows through the small holes inside the fifth thermostat 65 and the first thermostat 61 in the cylinder block water jacket 2 and the cylinder head water jacket 3 to avoid local overheating to form bubbles. At this time, the cylinder body and the cylinder head body are heated up rapidly, so that friction loss is reduced, and the thermal efficiency of the engine is improved.
Working condition 2, the first thermostat 61 of the first circuit is controlled to open, and the warm air core 4 starts working.
When the cooling liquid reaches a certain temperature, the temperature range of the cooling liquid is 45-50 ℃ (namely, the temperature range is within a first preset temperature range), the first thermostat 61 of the warm air core 4 is controlled to open, and the cooling liquid starts to flow from the cylinder head water jacket 3 through the first loop, so that the effects of defrosting, demisting and heating the cockpit can be achieved.
Working condition 3, the second thermostat 62 of the second circuit is controlled to open, and the engine oil heat exchanger 8 starts working.
When the temperature of the cooling liquid is further raised to 50 ℃ (50 ℃ -65 ℃ herein constitutes a second preset temperature range in the present embodiment), the second thermostat 62 of the engine oil heat exchanger 8 is controlled to open, the second circuit starts to flow while the first circuit also flows simultaneously according to the requirement. At this time, the cooling liquid can heat the engine oil through the engine oil heat exchanger 8, so that the temperature of the engine oil is increased, the viscosity is reduced, the friction loss of the engine is further reduced, and the thermal efficiency of the engine is improved.
And 4, controlling the third thermostat 63 of the third circuit to open, and starting the operation of the engine oil heat exchanger 9 of the transmission.
When the temperature of the coolant further increases to 65 ℃ (65 ℃ -85 ℃ here constitutes a third preset temperature range in the present embodiment), the third thermostat 63 of the transmission oil heat exchanger 9 is controlled to open, and the third circuit starts to flow both the first circuit and the second circuit. At the moment, the cooling liquid can heat the transmission engine oil through the transmission engine oil heat exchanger, so that the temperature of the transmission engine oil is increased, the viscosity is reduced, the friction loss of the transmission is further reduced, and the thermal efficiency of the power assembly is improved.
In the process, when the temperature of the water jacket of the cylinder body is lower than 85 ℃, the fifth thermostat is in a closed state, and the cooling liquid participates in the flow of the first circuit, the second circuit and the third circuit through the water jacket 3 of the cylinder cover;
in the working condition 5, the fifth thermostat 65 controlling the cylinder block water jacket 2 is opened, and the coolant starts flowing from the cylinder block water jacket 2.
When the temperature of the cylinder block water jacket 2 is higher than 85 ℃ (here 85 ℃ -95 ℃ constitutes a fourth preset temperature range in the present embodiment), the fifth thermostat 65 is in an open state, and the coolant participates in the flows of the first circuit, the second circuit, and the third circuit through the cylinder head water jacket 3 and the cylinder block water jacket 2.
The above-mentioned are all the conditions of low ambient temperature, cold start of vehicle, start-up time and control sequence of cooling system. The start timing and sequence are researched to have better effect on improving the thermal efficiency of the power assembly.
Working condition 6, when the cooling temperature of the cooling liquid is higher than 95 ℃ (95 ℃ -105 ℃ in this embodiment constitutes a fifth preset temperature range) after the vehicle is warmed up: the fourth thermostat 64 of the radiator 10 is controlled to open and the fourth circuit starts to flow.
Further, when the cooling temperature of the cooling liquid is higher than 95 ℃, a fan 11 arranged at one end of the radiator 10 is started to drive a middle gear, so that the cooling liquid in the radiator 10 is cooled.
Further, when the temperature of the cooling liquid is higher than 105 ℃ (105 ℃ -120 ℃ in this embodiment constitutes a sixth preset temperature range), the fan 11 disposed at one end of the radiator 10 is turned on to cool the cooling liquid in the radiator 10.
Further, the gear of the fan 11 is not limited to the middle and high gears, and more gears such as the low, middle and high gears can be set in a finer temperature range, so that the energy consumption of the fan can be conveniently and accurately controlled.
Further, when the engine oil temperature is higher than 140 ℃ (i.e., the highest value of the seventh preset temperature range), the coolant cools the engine oil through the engine oil heat exchanger 8 of the second circuit. The lubrication is prevented from being influenced by the overhigh temperature of engine oil.
Further, when the transmission oil temperature is higher than 120 ℃ (where 120 ℃ to 140 ℃ constitute a seventh preset temperature range in the present embodiment), the cooling liquid cools the transmission oil through the transmission oil heat exchanger 9 of the third circuit. The lubrication is prevented from being influenced by the too high temperature of the engine oil of the transmission.
The invention also provides an automobile which is characterized by comprising the power assembly cooling system.

Claims (6)

1. A powertrain cooling system, comprising:
a water pump (1);
a cylinder body water jacket (2) and a cylinder head water jacket (3) which are communicated with a liquid outlet of the water pump (1) and are arranged in parallel;
the thermostat assembly is communicated with a liquid outlet of the cylinder head water jacket (3) and is communicated with a liquid outlet of the cylinder block water jacket (2) through a fifth thermostat (65);
the warm air core body (4), the engine oil heat exchanger (8), the transmission oil heat exchanger (9) and the radiator (10) are respectively communicated with a plurality of liquid outlets of the thermostat assembly, and the liquid outlets of the warm air core body (4), the engine oil heat exchanger (8), the transmission oil heat exchanger (9) and the radiator (10) are all communicated to the liquid inlet of the water pump (1);
a fan (11) arranged side by side with the radiator (10) for supplying cooling air for cooling the cooling liquid in the radiator (10);
when the outside environment temperature indicates that the engine is in a cold start condition, performing:
when the temperature detected by the water temperature sensor (7) indicates that the temperature of the cooling liquid is lower than the lowest value of a first preset temperature range, controlling the fifth thermostat (65) and the thermostat assembly to be closed;
when the temperature detected by the water temperature sensor (7) indicates that the temperature of the cooling liquid is in a first preset temperature range, the thermostat assembly is controlled to only conduct the warm air core (4), and the cooling liquid flows to the warm air core (4) to defrost, defog and/or heat the cockpit;
when the temperature detected by the water temperature sensor (7) indicates that the temperature of the cooling liquid is in a second preset temperature range, the thermostat assembly is controlled to conduct the warm air core (4) and the engine oil heat exchanger (8), the cooling liquid flows to the warm air core (4) to defrost, defog and/or heat the cockpit, and the cooling liquid further heats engine oil through the engine oil heat exchanger (8);
when the temperature detected by the water temperature sensor (7) indicates that the temperature of the cooling liquid is in a third preset temperature range, the thermostat assembly is controlled to conduct the warm air core (4), the engine oil heat exchanger (8) and the transmission oil heat exchanger (9), the cooling liquid flows to the warm air core (4) to defrost, defog and/or heat the cockpit, the cooling liquid heats engine oil through the engine oil heat exchanger (8), and the cooling liquid further heats transmission oil through the transmission oil heat exchanger (9); or (b)
When the temperature detected by the water temperature sensor (7) indicates that the temperature of the cooling liquid is in a fourth preset temperature range, controlling the warm air core (4), the engine oil heat exchanger (8), the transmission oil heat exchanger (9) and the fifth thermostat to be opened, enabling the cooling liquid pumped by the water pump (1) to flow to the thermostat assembly through the cylinder head water jacket (3) and the cylinder body water jacket (2) at the same time, enabling the cooling liquid to flow to the warm air core (4) for defrosting, defogging and/or heating a cockpit, enabling the cooling liquid to heat engine oil through the engine oil heat exchanger (8), and enabling the cooling liquid to further heat the transmission oil through the transmission oil heat exchanger (9);
the first preset temperature range, the second preset temperature range, the third preset temperature range and the fourth preset temperature range are sequentially increased; when the engine is in a warm-up condition, performing:
when the temperature detected by the water temperature sensor (7) indicates that the temperature of the cooling liquid is in a fifth preset temperature range, controlling the thermostat assembly to conduct the radiator (10), and cooling the cooling liquid through the radiator (10);
when the temperature detected by the water temperature sensor (7) indicates that the temperature of the cooling liquid is in a sixth preset temperature range, the thermostat assembly is controlled to conduct the radiator (10) and a fan (11) on one side of the radiator (10) is controlled to be started, the cooling liquid is further cooled through the radiator (10), and cooling air provided by the fan (11) cools the cooling liquid in the radiator (10);
when the temperature detected by the water temperature sensor (7) indicates that the temperature of the cooling liquid is in a seventh preset temperature range, controlling the thermostat assembly to conduct the radiator (10), the transmission oil heat exchanger (9) and controlling the fan (11) on one side of the radiator (10) to be started, cooling the transmission oil through the transmission oil heat exchanger (9), cooling the cooling liquid further through the radiator (10), and cooling the cooling liquid in the radiator (10) by cooling air provided by the fan (11); or (b)
When the temperature detected by the water temperature sensor (7) indicates that the temperature of the cooling liquid is higher than the maximum value of a seventh preset temperature range, controlling the thermostat assembly to be connected with the radiator (10), the transmission engine oil heat exchanger (9), the engine oil heat exchanger (8) and a fan (11) controlling one side of the radiator (10) to be opened, cooling the cooling liquid further through the radiator (10), cooling the engine oil through the engine oil heat exchanger (8), and cooling the cooling liquid in the radiator (10) by cooling air provided by the fan (11);
the fifth preset temperature range is higher than the fourth preset temperature range, and the fifth preset temperature range, the sixth preset temperature range, and the seventh preset temperature range are sequentially increased.
2. The powertrain cooling system of claim 1, wherein the thermostat assembly includes a first thermostat (61) in communication with the warm air core (4), a second thermostat (62) in communication with the engine oil heat exchanger (8), a third thermostat (63) in communication with the transmission oil heat exchanger (9), and a fourth thermostat (64) in communication with the radiator (10).
3. The powertrain cooling system of claim 1 or 2, further comprising: a water temperature sensor (7) disposed within the thermostat assembly.
4. A power assembly cooling control method is applied to the power assembly cooling system according to any one of claims 1 to 3, and is characterized in that,
collecting the temperature of the outside environment of the vehicle, and judging whether the engine is in a cold start working condition;
when the outside environment temperature indicates that the engine is in a cold start condition, performing:
when the temperature detected by the water temperature sensor (7) indicates that the temperature of the cooling liquid is lower than the lowest value of a first preset temperature range, controlling the fifth thermostat (65) and the thermostat assembly to be closed;
when the temperature detected by the water temperature sensor (7) indicates that the temperature of the cooling liquid is in a first preset temperature range, the thermostat assembly is controlled to only conduct the warm air core (4), and the cooling liquid flows to the warm air core (4) to defrost, defog and/or heat the cockpit;
when the temperature detected by the water temperature sensor (7) indicates that the temperature of the cooling liquid is in a second preset temperature range, the thermostat assembly is controlled to conduct the warm air core (4) and the engine oil heat exchanger (8), the cooling liquid flows to the warm air core (4) to defrost, defog and/or heat the cockpit, and the cooling liquid further heats engine oil through the engine oil heat exchanger (8);
when the temperature detected by the water temperature sensor (7) indicates that the temperature of the cooling liquid is in a third preset temperature range, the thermostat assembly is controlled to conduct the warm air core (4), the engine oil heat exchanger (8) and the transmission oil heat exchanger (9), the cooling liquid flows to the warm air core (4) to defrost, defog and/or heat the cockpit, the cooling liquid heats engine oil through the engine oil heat exchanger (8), and the cooling liquid further heats transmission oil through the transmission oil heat exchanger (9); or (b)
When the temperature detected by the water temperature sensor (7) indicates that the temperature of the cooling liquid is in a fourth preset temperature range, controlling the warm air core (4), the engine oil heat exchanger (8), the transmission oil heat exchanger (9) and the fifth thermostat (65) to be opened, enabling the cooling liquid pumped by the water pump (1) to flow to the thermostat assembly through the cylinder head water jacket (3) and the cylinder body water jacket (2) at the same time, enabling the cooling liquid to flow to the warm air core (4), defrosting, defogging and/or heating the cockpit, enabling the cooling liquid to heat engine oil through the engine oil heat exchanger (8), and enabling the cooling liquid to further heat the transmission oil through the transmission oil heat exchanger (9);
the first preset temperature range, the second preset temperature range, the third preset temperature range and the fourth preset temperature range are sequentially increased.
5. The powertrain cooling control method of claim 4, wherein,
if the engine is not in the cold start working condition, judging whether the engine is in the warm working condition or not;
when the temperature detected by the water temperature sensor (7) indicates that the temperature of the cooling liquid is in a fifth preset temperature range, controlling the thermostat assembly to conduct the radiator (10), and cooling the cooling liquid through the radiator (10);
when the temperature detected by the water temperature sensor (7) indicates that the temperature of the cooling liquid is in a sixth preset temperature range, the thermostat assembly is controlled to conduct the radiator (10) and a fan (11) on one side of the radiator (10) is controlled to be started, the cooling liquid is further cooled through the radiator (10), and cooling air provided by the fan (11) cools the cooling liquid in the radiator (10);
when the temperature detected by the water temperature sensor (7) indicates that the temperature of the cooling liquid is in a seventh preset temperature range, controlling the thermostat assembly to conduct the radiator (10), the transmission oil heat exchanger (9) and controlling the fan (11) on one side of the radiator (10) to be started, cooling the transmission oil through the transmission oil heat exchanger (9), cooling the cooling liquid further through the radiator (10), and cooling the cooling liquid in the radiator (10) by cooling air provided by the fan (11); or (b)
When the temperature detected by the water temperature sensor (7) indicates that the temperature of the cooling liquid is higher than the maximum value of a seventh preset temperature range, controlling the thermostat assembly to be connected with the radiator (10), the transmission engine oil heat exchanger (9), the engine oil heat exchanger (8) and a fan (11) controlling one side of the radiator (10) to be opened, cooling the cooling liquid further through the radiator (10), cooling the engine oil through the engine oil heat exchanger (8), and cooling the cooling liquid in the radiator (10) by cooling air provided by the fan (11);
the fifth preset temperature range is higher than the fourth preset temperature range, and the fifth preset temperature range, the sixth preset temperature range, and the seventh preset temperature range are sequentially increased.
6. An automobile comprising the powertrain cooling system of any one of claims 1 to 3.
CN202210182360.2A 2022-02-25 2022-02-25 Power assembly cooling system, cooling control method and automobile Active CN114562358B (en)

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