CN112709624B - Engine thermal management system and method - Google Patents

Abstract

The invention provides an engine heat management system, which comprises a first cylinder cover heat dissipation loop, a cooling liquid pump, a three-way valve, a cylinder cover cooling jacket, a first temperature sensor and a first thermostat, wherein the first cylinder cover heat dissipation loop is composed of the cooling liquid pump, the three-way valve, the cylinder cooling jacket, a second temperature sensor and the second thermostat; on the basis, the invention also provides an engine heat management method; the system can perform targeted heat management according to the actual heat load of the cylinder body and the cylinder cover, avoids the situation that local cooling is excessive or insufficient in the traditional heat management mode, ensures that all parts of the engine work at proper temperature, and is favorable for improving the working efficiency and the service life of the engine.

Description

Engine thermal management system and method

Technical Field

The invention relates to the technical field of engine thermal management, in particular to an engine thermal management system and method.

Background

Resource consumption and exhaust emission generated by automobiles have seriously influenced the whole society, and in order to comply with the global environment-friendly industrial concept and construct resource-saving and environment-friendly societies, the automobile industry faces more and more challenges. Fuel consumption and emission regulations for vehicles are becoming increasingly stringent: the oil consumption of hundred kilometers in 2025 is required to be less than 4L, and the oil consumption of hundred kilometers in 2030 is more severe to 3.2L, so that the design of energy conservation and emission reduction of automobiles becomes an important subject of automobile manufacturers and researchers.

The engine is used as a core component of the automobile, how to further improve the combustion heat efficiency, and the emission reduction is not only strategic planning of governments of all countries, but also becomes an important factor influencing the market competitiveness of the automobile. Among a plurality of factors influencing the thermal efficiency of the engine, the thermal management system of the engine is very important, and the thermal management system of the engine can ensure that the engine works at a proper temperature and the normal performance of the engine is ensured. Thermodynamic studies and experiments have shown that approximately 20-30% of the heat generated by the engine is carried away by the cooling liquid. The heat management effect not only affects whether the engine can work normally, but also affects whether a large amount of energy of the engine can be effectively utilized. Therefore, proper design and optimization of engine thermal management systems is an important approach to improving engine performance and thermal efficiency.

In the heat management system in the prior art, a single tandem type cooling mode is adopted, namely, liquid is fed from an engine cylinder body, and cooling liquid flows to a cylinder cover through the cylinder body and then flows out. However, in actual operation of the engine, the thermal loads distributed in the various zones of the block and of the head are not equal and even differ considerably: the thermal load is large at the spark plug, the air inlet/outlet and other parts of the cylinder cover; while at the cylinder block, the high temperature heat load is mainly concentrated in the area of the cylinder block close to the cylinder head, and the heat load is relatively low in other areas of the cylinder block. Therefore, if the series cooling method is adopted for the cylinder block and the cylinder head, local supercooling or local insufficient cooling is likely to occur.

The engine heat management system and the engine heat management device can provide mutually independent heat management for an engine cylinder cover and a cylinder body, can also conduct heat management on air inlet and air outlet of an engine, ensure that the engine works in a proper environment, and can also effectively utilize heat energy generated by the engine, save energy and protect environment.

Disclosure of Invention

In view of the above problems in the prior art, it is an object of the present invention to provide a system and method for thermal management of an engine.

The invention provides an engine heat management system, which comprises a coolant pump, a three-way valve, a cylinder cover cooling jacket, a cylinder body cooling jacket, a first temperature sensor, a second temperature sensor, a first thermostat, a second thermostat, a radiator and a control unit, wherein the coolant pump is connected with the three-way valve;

an inlet of the three-way valve is connected with a liquid outlet end of the cooling liquid pump, a first outlet of the three-way valve is connected with the cylinder cover cooling jacket, the first temperature sensor and the first thermostat are sequentially connected in series, a second outlet of the three-way valve is connected with the cylinder body cooling jacket, the second temperature sensor and the second thermostat are sequentially connected in series, and the first temperature sensor, the second temperature sensor, the first thermostat and the second thermostat are all connected with the control unit;

the cooling liquid pump, the three-way valve, the cylinder cover cooling jacket, the first temperature sensor and the first thermostat form a first cylinder cover heat dissipation loop; the cooling liquid pump, the three-way valve, the cylinder cooling jacket, the second temperature sensor and the second thermostat form a first cylinder heat dissipation loop;

coolant pump, three-way valve, cylinder cap cooling jacket, first temperature sensor, first temperature saver and the radiator constitutes second cylinder cap heat-dissipating circuit, coolant pump, three-way valve, cylinder body cooling jacket, second temperature sensor, second temperature saver and the radiator constitutes second cylinder body heat-dissipating circuit.

Furthermore, the radiator is further connected with a fan, the fan is connected with the control unit, the control unit is used for controlling the opening and closing of the fan, and the control unit is also used for controlling the rotating speed of the fan.

Specifically, engine thermal management system still includes temperature regulation ware and intercooler, temperature regulation ware with first temperature sensor links to each other, temperature regulation ware with the intercooler links to each other, coolant pump, three-way valve, cylinder cap cooling jacket, first temperature sensor, temperature regulation ware and the intercooler constitutes engine air inlet thermal management branch road.

Specifically, a first control valve is further connected between the temperature regulator and the first temperature sensor, the first control valve is connected with the control unit, and the first control valve is used for regulating the flow of coolant entering the engine air inlet thermal management branch.

Preferably, the engine heat management system further comprises an exhaust pipeline connected with an air outlet of an engine cylinder, the exhaust pipeline is connected with a warm air device, and the exhaust pipeline and the warm air device form an exhaust warm air branch.

Further, the exhaust pipeline is provided with a second control valve, the second control valve is connected with the control unit, and the second control valve is used for controlling the opening and closing of the exhaust gas warm air branch.

Preferably, the system further comprises a first coolant pipeline arranged between the first temperature sensor and the first thermostat, the first coolant pipeline flows through the heater unit, the first coolant pipeline and the heater unit form a first coolant warm air branch, the first coolant pipeline is provided with a third control valve, the third control valve is connected with the control unit, and the third control valve is used for controlling the opening and closing of the first coolant warm air branch.

Further, the system further comprises a second cooling liquid pipeline arranged between the second temperature sensor and the second thermostat, the second cooling liquid pipeline flows through the warm air device, the second cooling liquid pipeline and the warm air device form a second cooling liquid warm air branch, the second cooling liquid pipeline is provided with a fourth control valve, the fourth control valve is connected with the control unit, and the fourth control valve is used for controlling the opening and closing of the second cooling liquid warm air branch.

Another aspect of the present invention provides a method for engine thermal management, where the method is applied to the engine thermal management system in the foregoing technical solution, and includes:

a first temperature sensor collects a first temperature and sends the first temperature to the control unit;

the control unit compares the first temperature with a preset first temperature threshold, when the first temperature is smaller than or equal to the first temperature threshold, the first cylinder cover heat dissipation loop is used for carrying out heat management on the engine cylinder cover, and when the first temperature is larger than the first temperature threshold, the second cylinder cover heat dissipation loop is used for carrying out heat management on the engine cylinder cover;

a second temperature sensor collects a second temperature and sends the second temperature to the control unit;

the control unit compares the second temperature with a preset second temperature threshold, when the second temperature is smaller than or equal to the second temperature threshold, the first cylinder body heat dissipation loop is used for carrying out heat management on the engine cylinder body, and when the second temperature is larger than the second temperature threshold, the second cylinder body heat dissipation loop is used for carrying out heat management on the engine cylinder body.

Further, the method further comprises:

the temperature regulator collects a third temperature and sends the third temperature to the control unit;

the control unit compares the third temperature with a first temperature;

and when the third temperature is higher than the first temperature, performing thermal management on the engine intake air by using the engine intake air thermal management branch.

Due to the technical scheme, the invention has the following beneficial effects:

1) the invention provides an engine heat management system which can perform targeted heat management according to actual heat loads of a cylinder body and a cylinder cover, avoid the situation that local cooling is excessive or insufficient easily caused by a traditional heat management mode, and ensure that all parts of an engine work at proper temperature.

2) The invention provides an intelligent parallel heat management system which can automatically open a second cylinder cover heat management loop or a second cylinder body heat management loop according to the actual temperatures of a cylinder cover and a cylinder body, adjust the working rotating speed of a fan, realize hierarchical control and further improve the heat management efficiency of the cylinder body and the cylinder cover.

3) Through the make full use of to the coolant liquid through the engine cylinder lid, realized the preliminary heat management to the engine intake, not only make the engine intake keep in suitable temperature range, ensured the normal work of engine, can also reduce the operating pressure of intercooler, practiced thrift the energy that intercooler work required consumption, improved energy utilization.

4) When the driver and crew need open the sky modulation in the lower car of air temperature and warm, the control unit in this application can control the second control valve and realize opening of waste gas warm braw branch road for the heat energy of the waste gas that the engine produced transmits to the heater unit through exhaust pipe, for passenger cabin heating, realizes the make full use of the energy.

5) This application make full use of in first coolant liquid branch road and the second coolant liquid branch road the heat of coolant liquid come for the heating installation heat supply, has not only improved the heating rate of heating installation, can also practice thrift the fuel consumption when traditional empty modulation is warm, is favorable to constructing resource-saving and environment-friendly society.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiment or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

FIG. 1 is a schematic structural diagram of an engine thermal management system provided in embodiment 1 of the present invention;

fig. 2 is a schematic structural diagram of an engine thermal management system provided in embodiment 2 of the present invention.

In the figure: 10-a coolant pump, 20-a three-way valve, 21-a three-way valve inlet, 21-a three-way valve first outlet, 22-a three-way valve second outlet, 31-a cylinder head cooling jacket, 32-a cylinder body cooling jacket, 41-a first temperature sensor, 42-a second temperature sensor, 51-a first thermostat, 511-a first connection port, 512-a second connection port, 52-a second thermostat, 521-a third connection port, 522-a fourth connection port, 60-a radiator, 61-a fan, 71-a temperature regulator, 72-an intercooler, 80-a heater, 81-a first coolant pipeline, 82-a second coolant pipeline, 91-a first control valve, 92-a second control valve, 93-a third control valve, 94-a fourth control valve, 100-a first cylinder cover heat dissipation loop, 200-a first cylinder body heat dissipation loop, 300-a second cylinder cover heat dissipation loop, 400-a second cylinder body heat dissipation loop, 500-an air inlet heat management branch, 600-a waste gas warm air branch and 800-a control unit.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

Example 1

Referring to fig. 1, the present embodiment provides an engine thermal management system, which includes a coolant pump 10, a three-way valve 20, a cylinder head cooling jacket 31, a cylinder block cooling jacket 32, a first temperature sensor 41, a second temperature sensor 42, a first thermostat 51, a second thermostat 52, a radiator 60, and a control unit 800; the first temperature sensor 41 is capable of detecting the temperature of the coolant passing through the head cooling jacket 31, and the second temperature sensor 42 is capable of detecting the temperature of the coolant passing through the block cooling jacket 32;

the three-way valve 20 includes a three-way valve inlet 21, a three-way valve first outlet 22 and a three-way valve second outlet 23, the three-way valve inlet 21 is connected to the liquid outlet of the coolant pump 10, the three-way valve first outlet 22 is connected to the cylinder head cooling jacket 31, the first temperature sensor 41 and the first thermostat 51 are sequentially connected in series, the three-way valve second outlet 23 is connected to the cylinder body cooling jacket 32, the second temperature sensor 42 and the second thermostat 52 are sequentially connected in series, and the coolant pump 10, the first temperature sensor 41, the second temperature sensor 42, the first thermostat 51 and the second thermostat 52 are all connected to the control unit 800; the control unit 800 can control the opening and closing of the coolant pump 10, and can also be used for controlling the opening degree of the coolant pump 10 when the coolant pump 10 is opened;

the first thermostat 51 includes a first connection port 511 and a second connection port 512, the second thermostat 52 includes a third connection port 521 and a fourth connection port 522, and the coolant pump 10, the three-way valve first outlet 22, the head cooling jacket 31, the first temperature sensor 41, and the first connection port 511 of the first thermostat 51 form a first head heat-dissipating loop 100; the coolant pump 10, the three-way valve second outlet 23, the cylinder cooling jacket 32, the second temperature sensor 42, and the third connection port 521 of the second thermostat 52 form a first cylinder heat-dissipation circuit 200;

the coolant pump 10, the three-way valve first outlet 22, the head cooling jacket 31, the first temperature sensor 41, the second connection port 512 of the first thermostat 51, and the radiator 60 constitute a second head heat dissipation circuit 300, and the coolant pump 10, the three-way valve second outlet 23, the second temperature sensor 42, the fourth connection port 522 of the second thermostat 52, and the radiator 60 constitute a second block heat dissipation circuit 400. When the second cylinder head heat dissipation loop 300 or the second cylinder body heat dissipation loop 400 is opened, the radiator 60 operates to cool the cooling liquid near the radiator 60, so as to reduce the temperature of the cooling liquid in the second cylinder head heat dissipation loop 300 or the second cylinder body heat dissipation loop 400 and improve the heat dissipation efficiency of the cylinder head or the cylinder body.

The heat sink 60 is further connected with a fan 61, the fan 61 is connected with the control unit 800, the control unit 800 is used for controlling the opening and closing of the fan 61, and when the fan 61 is opened, the control unit 800 can also be used for controlling the rotating speed of the fan 61.

Specifically, when neither the second head heat dissipation circuit 300 nor the second block heat dissipation circuit 400 is opened, both the radiator 60 and the fan 61 are in a closed state under the control of the control unit 800; when the second head dissipating circuit 300 is turned on or the second block dissipating circuit 400 is turned on, the control unit 800 controls the radiator 60 and the fan 61 to operate, and controls the fan 61 to be in a low-speed rotation operating state; when both the second head heat dissipation circuit 300 and the second block heat dissipation circuit 400 are turned on, the fan 61 is controlled to be turned on and to be in a high-speed rotation operating state.

It should be noted that in the embodiment of the present specification, the first thermostat 51 and the second thermostat 52 respectively open corresponding connection ports according to the temperature of the coolant flowing through the first thermostat 51 under the control of the control unit 800, specifically, when the temperature of the coolant flowing through the first thermostat 51 is less than or equal to a first temperature threshold, the first connection port 511 of the first thermostat 51 is conducted, that is, the first head heat dissipation circuit 100 is opened; when the temperature of the coolant flowing through the first thermostat 51 is greater than a first temperature threshold value, the second 512 connection port of the first thermostat 51 is connected, and the second cylinder head heat dissipation loop 200 is opened to dissipate heat of the engine cylinder head;

similarly, when the temperature of the coolant flowing through the second thermostat 52 is less than or equal to the second temperature threshold, the first connection port 521 of the second thermostat 52 is turned on, i.e., the first cylinder heat-dissipation circuit 300 is opened; when the temperature of the coolant flowing through the second thermostat 52 is greater than a second temperature threshold, the second 522 connection port of the second thermostat 52 is turned on, and the second cylinder heat dissipation circuit 400 is turned on to dissipate heat from the engine cylinder.

It should be noted that before the first cylinder head heat dissipation circuit 100 or the first cylinder block heat dissipation circuit 200 is opened to perform heat management on the engine cylinder head and the engine cylinder block, the temperatures acquired by the first temperature sensor 41 and the second temperature sensor 42 are compared with a cylinder head heat management threshold and a cylinder block heat management threshold, respectively, and when the temperatures of the engine cylinder head or the engine cylinder block are higher than the cylinder head heat management threshold and the cylinder block heat management threshold, the corresponding first cylinder head heat management circuit or the first cylinder block heat management circuit is opened. For example: when the engine is not in a working state, because fuel is not combusted, the temperature of the engine is raised, at this time, heat dissipation management on a cylinder head and a cylinder body of the engine is not needed, namely, at this time, the coolant pump 10 is closed, and the first cylinder head heat dissipation loop 100 and the first cylinder body heat dissipation loop 200 do not work.

The engine heat management system provided by the embodiment of the specification can perform targeted heat management according to the actual heat load of the cylinder body and the cylinder cover, avoids the situation that local cooling is excessive or insufficient in the traditional heat management mode, ensures that all parts of an engine work at proper temperature, and is beneficial to improving the working efficiency and prolonging the service life of the engine.

In addition, according to the embodiment, the second cylinder cover heat management loop or the second cylinder body heat management loop can be opened according to the actual temperatures of the cylinder cover and the cylinder body, the working speed of the fan is adjusted, hierarchical control is achieved, and the heat management efficiency of the cylinder body and the cylinder cover is further improved.

The engine thermal management system provided by the embodiment of the present specification further includes a temperature regulator 71 and an intercooler 72, one end of the temperature regulator 71 is connected to the first temperature sensor 41, the other end of the temperature regulator 71 is connected to the intercooler 72, the intercooler 72 is connected to an inlet end of the coolant pump 10, and the coolant pump 10, the first outlet 21 of the three-way valve 20, the cylinder head cooling jacket 31, the first temperature sensor 41, the temperature regulator 71 and the intercooler 72 form an engine air intake thermal management branch 500; the engine air intake thermal management branch 500 is used for thermal management of the air intake temperature in the engine air intake duct in the vicinity thereof.

A first control valve 91 is further connected between the temperature regulator 71 and the first temperature sensor 41, the first control valve 91 is connected with the control unit 800, and the first control valve 91 is used for regulating the flow rate of the coolant entering the engine intake thermal management branch 500.

In the engine thermal management system provided by the embodiment of the specification, the temperature regulator 71 can acquire the temperature of the engine intake air. When the acquired engine intake air temperature is higher than the temperature of the coolant flowing through the cylinder head cooling jacket, which is detected by the first temperature sensor 41, the control unit 800 controls the first control valve 91 to open the engine thermal management branch 500, so that the coolant flowing through the cylinder head cooling jacket 31 can at least partially flow through the engine thermal management branch 500, and is used for performing preliminary heat dissipation treatment on the engine intake air; the temperature of the engine intake air is further reduced by the intercooler 72 so that the engine intake air is maintained within a desired temperature range. The first control valve 91 can adjust the flow rate of the coolant flowing through the engine air intake thermal management branch passage 500 according to the temperatures detected by the temperature regulator 71 and the first temperature sensor 41, respectively, and the difference between the temperatures.

The engine heat management system provided by the embodiment of the specification realizes preliminary heat management of engine air intake by fully utilizing the cooling liquid flowing through the engine cylinder cover, so that the engine air intake is kept in a proper temperature range, the normal work of the engine is guaranteed, the working pressure of an intercooler can be reduced, and the energy utilization rate is improved.

The engine thermal management system provided by the embodiment further comprises an exhaust pipeline connected with an air outlet of an engine cylinder, the exhaust pipeline is connected with the warm air device 80, and the exhaust pipeline and the warm air device 80 form an exhaust warm air branch 600; in the prior art, most of waste gas generated by burning fuel oil in an engine is discharged to the external environment after being purified, so that the heat energy of the waste gas is wasted. And in this application, exhaust pipe can get up engine exhaust's heat make full use of for provide the heat source for the heater unit.

The exhaust pipeline is provided with a second control valve 92, the second control valve 92 is connected with the control unit 800, and the second control valve 92 is used for controlling the opening and closing of the exhaust warm air branch 600, such as: when the driver and the passengers in the vehicle need to open the air to adjust the heating in winter or at a lower air temperature, the control unit 800 controls the second control valve 92 to open the exhaust gas warm air branch 600; when the air temperature is high and the vehicle air conditioner is not required to be started for heating, the control unit 800 controls the second control valve 92 to close the exhaust gas warm air branch 600.

Further, the engine thermal management system provided in this embodiment further includes a first coolant pipeline 81, the first coolant pipeline 81 is disposed between the first temperature sensor 41 and the first thermostat 51, the first coolant pipeline 81 flows through the warm air device 80, the first coolant pipeline 81 and the warm air device 80 form a first coolant warm air branch, the first coolant pipeline 81 is provided with a third control valve 93, the third control valve 93 is connected to the control unit 800, and the third control valve 93 is used for controlling opening and closing of the first coolant warm air branch;

the system further comprises a second cooling liquid pipeline 82, the second cooling liquid pipeline 82 is arranged between the second temperature sensor 42 and the second thermostat 52, the second cooling liquid pipeline 82 flows through the warm air device 80, the second cooling liquid pipeline 82 and the warm air device 80 form a second cooling liquid warm air branch, the second cooling liquid pipeline 82 is provided with a fourth control valve 94, the fourth control valve 94 is connected with the control unit 800, and the fourth control valve 94 is used for controlling the opening and closing of the second cooling liquid warm air branch; since the temperature of the coolant flowing through the cylinder head cooling jacket 31 and the cylinder body cooling jacket 32 is also increased, at this time, if a user with a low temperature opens the air conditioner in the vehicle to perform heating, the heat energy in the first coolant pipeline 81 and the second coolant pipeline 82 can be transferred to the air heater 80, so that the heating of the passenger compartment heating is accelerated, the fuel consumption in the conventional heating process can be saved, and the resource-saving society can be constructed.

Example 2

Referring to fig. 2, the engine thermal management system of the present embodiment is different from embodiment 1 in that the intercooler 72 is connected to an inlet end of the cylinder head cooling jacket 31, and the cylinder head cooling jacket 31, the first temperature sensor 41, the temperature regulator 71 and the intercooler 72 form an engine intake thermal management branch 500.

Of course, the intercooler 72 may be connected to other positions besides the above-mentioned connecting position, and may perform the function of guiding out the coolant in the engine intake air thermal management branch 500.

The working principle and the beneficial effects of the engine management system provided by the embodiment are the same as those of the engine management system provided by the embodiment 1, and are not described in detail here.

Example 3

The present embodiment provides an engine thermal management method, which is used in any one of the engine thermal management systems provided in the above embodiments, and includes:

a first temperature sensor collects a first temperature, wherein the first temperature is the temperature of cooling liquid passing through the cylinder cover cooling jacket, and the first temperature is sent to the control unit;

the control unit compares the first temperature with a preset first temperature threshold, when the first temperature is smaller than or equal to the first temperature threshold, the control unit controls the first temperature-saving valve to conduct a first connecting port, the first cylinder cover heat-dissipation loop is used for carrying out heat management on the engine cylinder cover, when the first temperature is larger than the first temperature threshold, the control unit controls the first temperature-saving valve to conduct a second connecting port, and the second cylinder cover heat-dissipation loop is used for carrying out heat management on the engine cylinder cover;

a second temperature sensor collects a second temperature, wherein the second temperature is the temperature of the cooling liquid passing through the cylinder body cooling jacket and is sent to the control unit;

the control unit compares the second temperature with a preset second temperature threshold, when the second temperature is less than or equal to the second temperature threshold, the control unit controls the second thermostatic valve to conduct a third connecting port, the first cylinder block heat dissipation loop is used for carrying out heat management on the engine cylinder block, when the second temperature is greater than the second temperature threshold, the control unit controls the second thermostatic valve to conduct a fourth connecting port, and the second cylinder block heat dissipation loop is used for carrying out heat management on the engine cylinder block;

the method further comprises the following steps:

the temperature regulator collects a third temperature, wherein the third temperature is the temperature of the air inlet of the engine and sends the third temperature to the control unit;

the control unit compares the third temperature with a first temperature;

when the third temperature is higher than the first temperature, the control unit controls the third control valve to open an engine air inlet thermal management branch, and the engine air inlet thermal management branch is utilized to carry out thermal management on engine air inlet. When the third temperature is higher than the first temperature, namely the temperature of the intake air of the engine is higher than the temperature of the cooling liquid passing through the cylinder cover cooling jacket, at the moment, the cooling liquid passing through the cylinder cover cooling jacket can also act on the intake air of the engine for heat management.

Further, the method may further include:

when the control unit detects that the vehicle-mounted air conditioner is in a heating mode;

controlling the second control valve to open the exhaust gas warm air branch to carry out thermal management on the warm air device;

the control unit controls the third control valve to open the first cooling liquid pipeline, and the first cooling liquid pipeline is utilized to carry out thermal management on the heating device;

the control unit controls the fourth control valve to open the second cooling liquid pipeline, and the second cooling liquid pipeline is utilized to carry out heat management on the heating device.

Further, before the first cooling liquid pipeline or the second cooling liquid pipeline is opened, the method may further include:

acquiring a set value of a vehicle-mounted air conditioner, and comparing the first temperature and the second temperature with the set value of the vehicle-mounted air conditioner respectively;

and when the first temperature is greater than or equal to the set value of the vehicle-mounted air conditioner, the first cooling liquid pipeline is opened, and when the second temperature is greater than or equal to the set value of the vehicle-mounted air conditioner, the second cooling liquid pipeline is opened.

While the invention has been described with reference to specific embodiments, it will be appreciated by those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the invention can be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Also, in some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results.

Claims (8)

1. The engine thermal management system is characterized by comprising a cooling liquid pump (10), a three-way valve (20), a cylinder cover cooling jacket (31), a cylinder cooling jacket (32), a first temperature sensor (41), a second temperature sensor (42), a first thermostat (51), a second thermostat (52), a radiator (60) and a control unit (800), wherein the control unit (800) controls the opening and closing of the cooling liquid pump (10) and controls the opening degree of the cooling liquid pump (10) when the cooling liquid pump is opened;

an inlet of the three-way valve (20) is connected with a liquid outlet end of the cooling liquid pump (10), a first outlet of the three-way valve (20) is connected with the cylinder cover cooling jacket (31), the first temperature sensor (41) and the first thermostat (51) are sequentially connected in series, a second outlet of the three-way valve (20) is connected with the cylinder body cooling jacket (32), the second temperature sensor (42) and the second thermostat (52) are sequentially connected in series, and the first temperature sensor (41), the second temperature sensor (42), the first thermostat (51) and the second thermostat (52) are all connected with the control unit (800);

the cooling liquid pump (10), the three-way valve (20), the cylinder cover cooling jacket (31), the first temperature sensor (41) and the first thermostat (51) form a first cylinder cover heat dissipation loop (100); the cooling liquid pump (10), the three-way valve (20), the cylinder cooling jacket (32), the second temperature sensor (42) and the second thermostat (52) form a first cylinder heat dissipation loop (200);

the cooling liquid pump (10), the three-way valve (20), the cylinder cover cooling jacket (31), the first temperature sensor (41), the first thermostat (51) and the radiator (60) form a second cylinder cover heat dissipation loop (300), and the cooling liquid pump (10), the three-way valve (20), the cylinder cooling jacket (32), the second temperature sensor (42), the second thermostat (52) and the radiator (60) form a second cylinder body heat dissipation loop (400);

the engine thermal management system further comprises a temperature regulator (71) and an intercooler (72), one end of the temperature regulator (71) is connected with the first temperature sensor (41), the other end of the temperature regulator (71) is connected with the intercooler (72), the intercooler (72) is connected with an inlet end of the cylinder head cooling jacket (31), and the cylinder head cooling jacket (31), the first temperature sensor (41), the temperature regulator (71) and the intercooler (72) form an engine air inlet thermal management branch (500); the intercooler (72) is connected with the liquid inlet end of the cylinder cover cooling sleeve (31) so that the cooling liquid of the engine air inlet thermal management branch (500) is led out;

a first control valve (91) is further connected between the temperature regulator (71) and the first temperature sensor (41), the first control valve (91) is connected with the control unit (800), and the first control valve (91) is used for regulating the flow of the cooling liquid entering the engine air inlet thermal management branch (500).

2. An engine thermal management system according to claim 1, characterized in that a fan (61) is further connected to the radiator (60), the fan (61) is connected to the control unit (800), the control unit (800) is configured to control the opening and closing of the fan (61), and the control unit (800) is further configured to control the rotation speed of the fan (61).

3. An engine thermal management system according to claim 1, further comprising an exhaust line connected to an outlet of an engine cylinder, the exhaust line being connected to a heater unit (80), the exhaust line and the heater unit (80) forming an exhaust gas heater branch (600).

4. An engine thermal management system according to claim 3, characterized in that the exhaust line is provided with a second control valve (92), the second control valve (92) being connected to the control unit (800), the second control valve (92) being adapted to control the opening and closing of the exhaust warm air branch (600).

5. The engine thermal management system according to claim 3, further comprising a first coolant line (81) arranged between the first temperature sensor (41) and the first thermostat (51), wherein the first coolant line (81) flows through the warm air device (80), the first coolant line (81) and the warm air device (80) form a first coolant warm air branch, the first coolant line (81) is provided with a third control valve (93), the third control valve (93) is connected with the control unit (800), and the third control valve (93) is used for controlling the opening and closing of the first coolant warm air branch.

6. The engine thermal management system of claim 5, further comprising a second coolant line (82) disposed between the second temperature sensor (42) and the second thermostat (52), the second coolant line (82) flowing through the heater unit (80), the second coolant line (82) and the heater unit (80) forming a second coolant heater branch, the second coolant line (82) being provided with a fourth control valve (94), the fourth control valve (94) being connected to the control unit (800), the fourth control valve (94) being configured to control opening and closing of the second coolant heater branch.

7. A method for engine thermal management, applied to an engine thermal management system according to any one of claims 1 to 6, comprising:

a first temperature sensor collects a first temperature and sends the first temperature to the control unit; the control unit compares the first temperature with a preset first temperature threshold, when the first temperature is smaller than or equal to the first temperature threshold, the first cylinder cover heat dissipation loop is used for carrying out heat management on the engine cylinder cover, and when the first temperature is larger than the first temperature threshold, the second cylinder cover heat dissipation loop is used for carrying out heat management on the engine cylinder cover;

a second temperature sensor collects a second temperature and sends the second temperature to the control unit; the control unit compares the second temperature with a preset second temperature threshold, when the second temperature is smaller than or equal to the second temperature threshold, the first cylinder body heat dissipation loop is used for carrying out heat management on the engine cylinder body, and when the second temperature is larger than the second temperature threshold, the second cylinder body heat dissipation loop is used for carrying out heat management on the engine cylinder body.

8. The method of engine thermal management according to claim 7, further comprising:

the temperature regulator collects a third temperature and sends the third temperature to the control unit;

the control unit compares the third temperature with a first temperature;

and when the third temperature is higher than the first temperature, performing thermal management on the engine intake air by using the engine intake air thermal management branch.

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