Engine cooling system

Abstract

The embodiment of the application provides an engine cooling system, comprising an engine, a high-temperature radiator, a first thermostat, an engine water pump, a second thermostat and an oil cooler; the water outlet end on the cylinder body of the engine is communicated with the water inlet end of the high-temperature radiator, the water outlet end of the high-temperature radiator is communicated with the first water inlet of the first thermostat, the water outlet of the first thermostat is communicated with the water inlet end of the engine water pump, the water outlet end of the engine water pump is communicated with the water inlet end on the cylinder body of the engine; the second water inlet of the first thermostat is communicated with the water outlet end on the cylinder body of the engine; the water inlet end of the oil cooler is connected with the water outlet end of the engine water pump through the second thermostat, and the water outlet end of the oil cooler is communicated with the water inlet end of the engine water pump. The application can heat the CVT transmission by using the engine waste heat during the cold start, improve the CVT transmission efficiency and reduce the vehicle fuel consumption.

Description

Technical Field

[0001] This application relates to the field of engine technology, and more particularly to an engine cooling system. Background Technology

[0002] The engine is the power source of a car, and the transmission is a crucial component for power transmission. CVT transmissions, due to their continuously variable transmission characteristics, offer smooth, seamless gear changes and are therefore widely used in automobiles. The efficiency of both directly affects vehicle emissions and energy consumption, and efficiency is directly related to their operating temperature. Efficiency is optimal within a certain temperature range (80-120℃). At low temperatures (below 75℃), the lubricating oil viscosity is high, reducing efficiency. At extremely high temperatures (130℃), torque is limited to ensure functionality. Therefore, during cold starts, rapid warm-up of both components is desirable, and during engine operation, rapid heat dissipation to achieve thermal equilibrium is crucial. The engine cooling system dissipates heat from the engine and CVT oil cooler. Additionally, if there is a heating requirement in the passenger compartment, heat from the engine cooling system can be transferred to the passenger compartment. Existing engine cooling systems have the following problems: when there is no heating requirement, coolant flow is diverted to the heater core, preventing sufficient cooling by the radiator; and during cold starts, the CVT oil cooler temperature rises slowly. Utility Model Content

[0003] This application provides an engine cooling system, which relates to the field of engine cooling technology and can solve the problem of slow oil temperature rise in CVT oil coolers during cold starts.

[0004] This application provides an engine cooling system, including an engine, a high-temperature radiator, a first thermostat, an engine water pump, a second thermostat, and an oil cooler; The water outlet on the engine block is connected to the water inlet of the high-temperature radiator; the water outlet of the high-temperature radiator is connected to the first water inlet of the first thermostat; the water outlet of the first thermostat is connected to the water inlet of the engine water pump; the water outlet of the engine water pump is connected to the water inlet on the engine block; and the second water inlet of the first thermostat is connected to the water outlet on the engine block. The inlet of the oil cooler is connected to the outlet of the engine water pump via the second thermostat, and the outlet of the oil cooler is connected to the inlet of the engine water pump.

[0005] Optional features also include a warm air core; The water inlet of the heater core is connected to the water outlet of a valve body, and the water inlet of the valve body is connected to the water passage on the cylinder head of the engine; the water outlet of the heater core is connected to the water inlet of the engine water pump through a first pipe.

[0006] Optionally, it also includes an expansion tank, which is connected to the outlet of the high-temperature radiator via a second pipe.

[0007] Optionally, it may also include an exhaust valve that communicates with a water passage on the cylinder head of the engine.

[0008] Optionally, a fan is also included, which is disposed on one side of the high-temperature heat sink and is arranged parallel to the high-temperature heat sink.

[0009] Optionally, the valve body is an electrically controlled HVAC valve.

[0010] This application moves the oil cooler to the engine water pump outlet and adds a second thermostat between the engine water pump and the oil cooler to utilize the engine's waste heat to heat the CVT transmission during cold starts, thereby improving the efficiency of the CVT transmission and reducing the overall vehicle fuel consumption.

[0011] This application, by setting a valve body, prevents coolant from entering the heater core when there is no heating demand in the passenger compartment. This increases the coolant flow through the high-temperature radiator, making full use of the high-temperature radiator to cool the engine and CVT transmission. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 A control principle diagram of an engine cooling system provided in this application embodiment; Figure 2 This is a comparison curve of CVT oil temperature for WLTC cycle.

[0014] Explanation of reference numerals in the attached figures: 1-Engine, 2-High-temperature radiator, 3-First thermostat, 4-Engine water pump, 5-Second thermostat, 6-Oil cooler, 7-First water inlet, 8-Second water inlet, 9-Heater core, 10-Valve body, 11-First pipe, 12-Expansion tank, 13-Second pipe, 14-Exhaust valve, 15-Fan. Detailed Implementation

[0015] To better understand the technical solutions in this specification, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0016] It should be understood that the described embodiments are merely some, not all, of the embodiments in this specification. All other embodiments obtained by those skilled in the art based on the embodiments in this specification without inventive effort are within the scope of protection of this specification.

[0017] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this specification. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0018] The technical solutions protected by the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0019] Please see Figure 1 An engine cooling system provided in this application embodiment includes an engine 1, a high-temperature radiator 2, a first thermostat 3, an engine water pump 4, a second thermostat 5, and an oil cooler 6; the oil cooler 6 is a CVT oil cooler.

[0020] The water outlet on the cylinder block of engine 1 is connected to the water inlet of high-temperature radiator 2. The water outlet of high-temperature radiator 2 is connected to the first water inlet 7 of the first thermostat 3. The water outlet of the first thermostat 3 is connected to the water inlet of engine water pump 4. The water outlet of engine water pump 4 is connected to the water inlet on the cylinder block of engine 1. The second water inlet 8 of the first thermostat 3 is connected to the water outlet on the cylinder block of engine 1.

[0021] The inlet of the oil cooler 6 is connected to the outlet of the engine water pump 4 via the second thermostat 5, and the outlet of the oil cooler 6 is connected to the inlet of the engine water pump 4. It also includes a heater core 9; the inlet of the heater core 9 is connected to the outlet of a valve body 10, and the inlet of the valve body 10 is connected to a water passage on the cylinder head of the engine 1; the outlet of the heater core 9 is connected to the inlet of the engine water pump 4 via a first pipe 11. Preferably, the valve body 10 is an electrically controlled heating valve. As another implementation, the inlet of the valve body 10 can also be directly connected to the outlet on the cylinder block of the engine 1.

[0022] This application connects the inlet of the oil cooler 6 to the outlet of the engine water pump 4 via the second thermostat 5, and the outlet of the oil cooler 6 is connected to the inlet of the engine water pump 4. This allows the engine's waste heat to be used to heat the CVT transmission during cold starts, improving CVT transmission efficiency and reducing overall vehicle fuel consumption. By installing a valve body 10 in the heating circuit, when there is no heating requirement in the passenger compartment, closing the valve body 10 prevents coolant from entering the heater core 9, thereby increasing the coolant flow through the high-temperature radiator 2 and fully utilizing the high-temperature radiator 2 to cool the engine 1 and CVT transmission.

[0023] Specific applications are as follows: Section 2 Temperature Regulator 5 Opening Strategy: Opening temperature 75℃.

[0024] When there is no heating requirement in the passenger compartment, and when the coolant temperature is less than 75°C, the first inlet 7 of the first thermostat 3 is not connected to the outlet of the first thermostat 3, the second inlet 8 of the first thermostat 3 is connected to the outlet of the first thermostat 3, the second thermostat 5 is closed, and the valve body 10 is closed: the engine cooling system is in a small circulation, and the coolant flow sequence is as follows: The water enters the engine water pump 4 through the inlet end on the cylinder block of the engine 1 into the water passage on the cylinder block of the engine 1, then into the water passage on the cylinder head of the engine 1, and then into the water passage on the cylinder block of the engine 1. After that, it flows out from the outlet end on the cylinder block of the engine 1, enters the first thermostat 3 through the second inlet 8 of the first thermostat 3, and enters the engine water pump 4 through the outlet of the first thermostat 3. When the engine cooling system is in the small circulation phase, the coolant is heated by the heat from the engine, while the CVT oil temperature rises by its own heat generation.

[0025] When there is no heating requirement in the passenger compartment, and when the coolant temperature is ≥75℃ and <80℃, the first inlet 7 of the first thermostat 3 is not connected to the outlet of the first thermostat 3, the second inlet 8 of the first thermostat 3 is connected to the outlet of the first thermostat 3, the second thermostat 5 is open, and the valve body 10 is closed: the engine cooling system is in a small circulation, and the coolant flow sequence is as follows: The water enters the engine water pump 4 through the inlet end on the cylinder block of the engine 1 into the water passage on the cylinder block of the engine 1, then into the water passage on the cylinder head of the engine 1, and then into the water passage on the cylinder block of the engine 1. After that, it flows out from the outlet end on the cylinder block of the engine 1, enters the first thermostat 3 through the second inlet 8 of the first thermostat 3, and enters the engine water pump 4 through the outlet of the first thermostat 3. From engine water pump 4 to second thermostat 5 to oil cooler 6 back to engine water pump 4; The coolant in the small circulation of the engine cooling system is heated by the heat of engine 1, and the rate of temperature rise of engine 1 is higher than the rate of temperature rise of oil cooler 6. When the second thermostat 5 is opened, the coolant of engine 1 can be used to heat oil cooler 6, thereby increasing oil temperature and improving efficiency.

[0026] When there is no heating requirement in the passenger compartment, and when the coolant temperature is ≥80℃, the first inlet 7 of the first thermostat 3 is connected to the outlet of the first thermostat 3, and the second inlet 8 of the first thermostat 3 is not connected to the outlet of the first thermostat 3. The second thermostat 5 is open, and the valve body 10 is closed: the engine cooling system enters the large circulation, and the coolant flow sequence is as follows: The water enters the engine water pump 4 through the inlet end on the cylinder block of the engine 1 into the water passage on the cylinder block of the engine 1, then into the water passage on the cylinder head of the engine 1, and then into the water passage on the cylinder block of the engine 1. After that, it flows out from the outlet end on the cylinder block of the engine 1, passes through the high temperature radiator 2, flows through the high temperature radiator 2 into the first inlet 7 of the first thermostat 3, then enters the first thermostat 3 through the first inlet 7, and then enters the engine water pump 4 through the outlet of the first thermostat 3. From engine water pump 4 to second thermostat 5 to oil cooler 6 back to engine water pump 4; The coolant in the engine cooling system's main circulation loop is heated after passing through the cylinder block, cylinder head, and oil cooler 6 of engine 1, and then cooled down after passing through the high-temperature radiator 2 before returning to the engine, thereby achieving the effect of cooling engine 1 and CVT transmission.

[0027] When the passenger compartment requires heating, the ambient temperature is usually relatively low. As long as the coolant temperature is greater than 30 degrees Celsius (calibrable), valve 10 opens, and the coolant flow sequence in the HVAC circuit is as follows: The water enters the engine water pump 4 through the inlet end on the cylinder block of engine 1, then enters the water passage on the cylinder head of engine 1, and enters the heater core 9 through the valve body 10, and then from the heater core 9 to the engine water pump 4.

[0028] Preferably, the system also includes an expansion tank 12, an exhaust valve 14, and a fan 15. The expansion tank 12 is connected to the outlet of the high-temperature radiator 2 via a second pipe 13. The exhaust valve 14 is connected to the water passage on the cylinder head of the engine 1. The fan 15 is located on one side of the high-temperature radiator 2 and is arranged parallel to the high-temperature radiator 2.

[0029] Compared to the existing engine cooling system, when there is no heating requirement in the passenger compartment, the modified engine cooling system increases the flow rate of the high-temperature radiator from 119 L / min to 155 L / min, a 23% increase; and the flow rate of the coolant flowing through the CVT oil cooler from 24 L / min to 40 L / min, a 40% increase. After the modification, the proportion of coolant flowing through the high-temperature radiator increases from 61% to 79%, making fuller use of the radiator to dissipate heat. See the table below: Comparison of the modified and existing engine cooling systems when there is no heating requirement in the passenger compartment:

[0030] The modified engine cooling system, under WLTC (Worldwide Standard Light Vehicles Test Procedure) fuel consumption test conditions, showed little change in the engine coolant temperature rise slope and final equilibrium temperature. However, the CVT oil temperature rose significantly faster during cold starts, increasing from 74°C to 90°C at the end of the cycle. Overall vehicle fuel consumption decreased from 7.56L / 100km to 7.48L / 100km, a reduction of approximately 1%. (See attached image) Figure 2 As shown.

[0031] The first thermostat 3, which controls the engine cooling system's entry into the large and small circulation loops, is set to an initial opening temperature of 80℃; the second thermostat 5, which controls whether coolant flows through the CVT oil cooler, is set to an initial opening temperature of 75℃. The temperature difference between these two values ​​allows for the use of engine waste heat to heat the CVT. Both thermostats can be calibrated and modified to better achieve the effect of using engine waste heat to heat the CVT during cold starts.

[0032] The above description is merely a preferred embodiment of this specification and is not intended to limit this specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this specification should be included within the scope of protection of this specification.

Claims

1. An engine cooling system, characterized in that, Includes engine (1), high temperature radiator (2), first thermostat (3), engine water pump (4), second thermostat (5) and oil cooler (6); The outlet of the engine (1) is connected to the inlet of the high-temperature radiator (2), the outlet of the high-temperature radiator (2) is connected to the first inlet (7) of the first thermostat (3), the outlet of the first thermostat (3) is connected to the inlet of the engine water pump (4), the outlet of the engine water pump (4) is connected to the inlet of the engine (1); the second inlet (8) of the first thermostat (3) is connected to the outlet of the engine (1) on the cylinder block. The inlet of the oil cooler (6) is connected to the outlet of the engine water pump (4) through the second thermostat (5), and the outlet of the oil cooler (6) is connected to the inlet of the engine water pump (4).

2. The engine cooling system according to claim 1, characterized in that, It also includes the warm air core (9); The water inlet of the heater core (9) is connected to the water outlet of a valve body (10), and the water inlet of the valve body (10) is connected to the water passage on the cylinder head of the engine (1); the water outlet of the heater core (9) is connected to the water inlet of the engine water pump (4) through the first pipe (11).

3. The engine cooling system according to claim 2, characterized in that, It also includes an expansion tank (12), which is connected to the outlet of the high-temperature radiator (2) via a second pipe (13).

4. The engine cooling system according to claim 2, characterized in that, It also includes an exhaust valve (14) that is connected to a water passage on the cylinder head of the engine (1).

5. The engine cooling system according to claim 2, characterized in that, It also includes a fan (15), which is disposed on one side of the high-temperature radiator (2) and is disposed parallel to the high-temperature radiator (2).

6. The engine cooling system according to claim 2, characterized in that, The valve body (10) is an electrically controlled HVAC valve.

Images