Engine cooling system and vehicle

Abstract

The utility model relates to the technical field of vehicle engine heat dissipation, and discloses an engine heat dissipation system and a vehicle. The voltage regulation power distribution device is electrically connected with the low-voltage power supply, and the voltage regulation power distribution device is suitable for increasing the low voltage of the low-voltage power supply to high voltage and transmitting the high voltage; and the high-voltage heat dissipation device is electrically connected with the voltage regulation power distribution device, and the high-voltage heat dissipation device is suitable for receiving the high voltage transmitted by the voltage regulation power distribution device. According to the utility model, the voltage of the electric energy storage system of the vehicle is controlled below the safe voltage, so that the electric safety performance of the vehicle is improved, and the complexity caused by additional protection measures is reduced; moreover, low voltage of the low-voltage power supply is increased to high voltage through the voltage regulation power distribution device and transmitted to the high-voltage heat dissipation device, and the high-voltage heat dissipation device has high heat dissipation efficiency, so that the engine heat dissipation system meets the heat dissipation requirement of the engine; meanwhile, loss caused by direct fan of a vehicle engine through a belt pulley is reduced, power consumption of the whole vehicle is reduced, and fuel efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle engine heat dissipation, in particular to an engine heat dissipation system and a vehicle. Background Art

[0002] When the engine operates, a large amount of heat is generated, which affects the working performance of the engine. Therefore, it is necessary to set up a heat dissipation system for the engine to cool it down. Affected by the voltage of the vehicle power supply, in the prior art, low-voltage components such as an electronic fan are usually used to dissipate heat for the engine. However, the low-voltage fan has a small power and a small heat dissipation air volume generated, which cannot meet the heat dissipation requirements of the engine. Summary of the Utility Model

[0003] In view of this, the utility model provides an engine heat dissipation system and a vehicle to solve the problem that the existing engine heat dissipation system cannot meet the heat dissipation requirements of the engine.

[0004] In a first aspect, the utility model provides an engine heat dissipation system, comprising: a low-voltage power supply; a voltage regulation and power distribution device electrically connected to the low-voltage power supply, the voltage regulation and power distribution device being adapted to raise the low voltage of the low-voltage power supply to a high voltage and transmit it; a high-voltage heat dissipation device electrically connected to the voltage regulation and power distribution device, the high-voltage heat dissipation device being adapted to receive the high voltage transmitted by the voltage regulation and power distribution device.

[0005] In an optional embodiment, the low-voltage power supply includes a low-voltage power generation device and a low-voltage battery, the low-voltage power generation device is electrically connected to the low-voltage battery, and the low-voltage battery is electrically connected to the voltage regulation and power distribution device.

[0006] In an optional embodiment, the low-voltage power generation device includes a low-voltage generator and a low-voltage generator controller, the low-voltage generator controller is electrically connected to both the low-voltage generator and the low-voltage battery, and the low-voltage generator is adapted to be drivingly connected to the engine.

[0007] In an optional embodiment, the low-voltage generator is a starting and generating motor.

[0008] In an optional embodiment, the voltage regulation and power distribution device includes a boost DCDC regulator and a high-voltage power distribution box, the boost DCDC regulator is electrically connected to the low-voltage power supply, the boost DCDC regulator is electrically connected to the high-voltage power distribution box, and the high-voltage power distribution box is electrically connected to the high-voltage heat dissipation device.

[0009] In an optional embodiment, the engine heat dissipation system further includes a high-voltage electrical component, and the high-voltage power distribution box is electrically connected to the high-voltage electrical component.

[0010] In an alternative embodiment, the voltage regulating power distribution device further includes a step-down DCDC regulator. The low-voltage power supply is electrically connected to the step-down DCDC regulator. The engine cooling system further includes low-voltage electrical components, and the step-down DCDC regulator is electrically connected to the low-voltage electrical components.

[0011] In an alternative embodiment, the engine cooling system further includes a second low-voltage battery. The step-down DCDC regulator is electrically connected to the second low-voltage battery, and the voltage of the second low-voltage battery is lower than the voltage of the low-voltage battery.

[0012] In an alternative embodiment, the high-voltage cooling device includes a radiator and a high-voltage fan. The voltage regulating power distribution device is electrically connected to the high-voltage fan. The radiator is adapted to exchange heat with the engine, and the high-voltage fan is adapted to dissipate heat from the radiator; and / or, the engine cooling system further includes a system controller, and the system controller is electrically connected to the low-voltage power supply, the voltage regulating power distribution device, and the high-voltage cooling device.

[0013] In a second aspect, the present invention further provides a vehicle including the above-mentioned engine cooling system.

[0014] The technical solution of the present application has the following advantages:

[0015] The engine cooling system provided by the present application controls the voltage of the vehicle's electrical energy storage system (REESS) to a low voltage below the safe voltage, improves the electrical safety performance of the vehicle, and reduces the complexity brought by additional protective measures; and, uses the voltage regulating power distribution device to boost the low voltage of the low-voltage power supply to a high voltage and transmit it to the high-voltage cooling device. The high-voltage cooling device has a high heat dissipation efficiency to enable the engine cooling system to meet the heat dissipation requirements of the engine; at the same time, reduces the loss caused by the vehicle engine directly driving the fan through a pulley, reduces the overall vehicle power consumption, and improves the fuel efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic connection structure diagram of an engine cooling system according to an embodiment of the present invention;

[0018] Figure 2Schematic connection structure diagram of another engine cooling system according to an embodiment of the present invention;

[0019] Figure 3 Schematic connection structure diagram of the engine cooling system when the low-voltage generator in the embodiment of the present invention is a starting motor.

[0020] Explanation of reference numerals:

[0021] 1. Low-voltage power supply; 11. Low-voltage power generation device; 111. Low-voltage generator; 112. Low-voltage generator controller; 12. Low-voltage battery; 2. Voltage regulation and power distribution device; 21. Boost DCDC regulator; 22. High-voltage power distribution box; 23. Step-down DCDC regulator; 3. High-voltage heat dissipation device; 31. Radiator; 32. High-voltage fan; 4. High-voltage electrical components; 5. Low-voltage electrical components; 6. Second low-voltage battery; 7. System controller; 10. Engine. Detailed implementation manners

[0022] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] The cooling systems of fuel engines usually use mechanical belt-driven large fans, silicone oil clutch fans, electromagnetic clutch fans, etc. for heat dissipation. All of them are affected by the engine 10 speed of the cooling fan, and the cooling system cannot achieve intelligent temperature control. The engine cooling system itself consumes a large amount of engine 10 power. After using an electronic fan for heat dissipation, the fan speed is no longer mechanically related to the engine 10 speed and is only related to the engine 10 water temperature, and independent heat dissipation control can be achieved. That is to say, the engine 10 does not need to directly output power to the cooling system, which not only improves the power utilization efficiency of the engine 10 but also reduces the fuel consumption of the engine 10.

[0024] The power supply systems of traditional fuel vehicles are divided into 12V systems and 24V systems, and the power supply voltage of the electronic components used is 12V or 24V; the electronic fan used for engine 10 heat dissipation usually uses 12V / 24V voltage, so the power of the electronic fan is small. On commercial vehicles, multiple electronic fans are usually required to meet the heat dissipation requirements, and the power demand for the 12 / 24V power supply is large. There is no suitable power supply on the vehicle, and the loss caused by large current is large, and the system efficiency is low. Affected by this, the application of electronic fans on commercial vehicles is not extensive at present.

[0025] According to the automotive voltage circuit defined by the national standard, for the Class A voltage circuit and the Class B voltage circuit that are conductively connected to each other, when one pole of the DC live part in the circuit is connected to the vehicle platform, and the maximum voltage value between any other live part and this pole is not greater than 30V AC (rms) and not greater than 60V DC, then this conductive connection circuit does not completely belong to the Class B voltage circuit. Only the part operating at the Class B voltage is recognized as the Class B voltage circuit. That is, 60V belongs to the Class A circuit voltage. Referring to GB / T18384.3-2015, the prevention of electric shock hazards should include preventing personnel from directly contacting any live part and providing protection in the case of basic insulation failure of the live part. For the Class A voltage circuit, no protection against electric shock hazards is required. For the live parts in any Class B voltage circuit, protection against direct contact electric shock hazards should be provided to personnel. The direct contact protection should be provided by the basic insulation of the live part or by a shield / enclosure, or a combination of both. An electronic fan using high voltage, usually 550V or higher, can effectively reduce the current, increase the product power, provide a larger heat dissipation air volume, and meet the requirements of the engine cooling system. However, traditional vehicles cannot supply high voltage to power the high-voltage fan 32.

[0026] The following combines Figures 1 to 3 , and describes the embodiments of the present invention.

[0027] According to an embodiment of the present invention, on the one hand, an engine cooling system is provided, including: a low-voltage power supply 1, a voltage regulation and distribution device 2, and a high-voltage heat dissipation device 3. The voltage regulation and distribution device 2 is electrically connected to the low-voltage power supply 1, and the voltage regulation and distribution device 2 is adapted to raise the low voltage of the low-voltage power supply 1 to a high voltage and transmit it. The high-voltage heat dissipation device 3 is electrically connected to the voltage regulation and distribution device 2, and the high-voltage heat dissipation device 3 is adapted to receive the high voltage transmitted by the voltage regulation and distribution device 2.

[0028] The engine cooling system provided by this embodiment controls the voltage of the vehicle's rechargeable energy storage system (REESS) at a low voltage below the safe voltage, improves the electrical safety performance of the vehicle, and reduces the complexity brought by additional protective measures; and, uses the voltage regulation and distribution device 2 to raise the low voltage of the low-voltage power supply 1 to a high voltage and transmit it to the high-voltage heat dissipation device 3. The high-voltage heat dissipation device 3 has a high heat dissipation efficiency, so that the engine cooling system can meet the heat dissipation requirements of the engine 10; at the same time, it reduces the loss caused by the vehicle engine 10 directly driving the fan through the pulley, reduces the overall vehicle power consumption, and improves the fuel efficiency.

[0029] It should be noted that, in this embodiment, the upper limit of the rated voltage output by the low-voltage power supply 1 is 60V; the rated voltage of the high-voltage heat dissipation device 3 is higher than 60V, and the rated voltage is generally set to 350V, 550V, 800V, etc.

[0030] Specifically, asFigures 1 to 3 As shown in the figure, the low-voltage power supply 1 includes a low-voltage power generation device 11 and a low-voltage battery 12. The low-voltage power generation device 11 is electrically connected to the low-voltage battery 12, and the low-voltage battery 12 is electrically connected to the voltage regulation and distribution device 2. The electric energy generated by the low-voltage power generation device 11 is stored in the low-voltage battery 12. The low-voltage battery 12 is used to regulate the power output, stabilize the bus voltage, and supply electric energy to the high-voltage heat dissipation device 3.

[0031] In this embodiment, the rated voltage output by the low-voltage power generation device 11 is 48V, and the rated voltage of the low-voltage battery 12 is 48V.

[0032] Furthermore, as Figures 1 to 3 shown, the low-voltage power generation device 11 includes a low-voltage generator 111 and a low-voltage generator controller 112. The low-voltage generator controller 112 is electrically connected to both the low-voltage generator 111 and the low-voltage battery 12. The low-voltage generator 111 is adapted to be drivingly connected to the engine 10. The input shaft of the low-voltage generator 111 is connected to the crankshaft of the engine 10 through a pulley and a belt in the front-end gear train of the engine 10. When the engine 10 is running, power is transmitted to the low-voltage generator 111 to provide a power source for the low-voltage generator 111. The low-voltage generator controller 112 is used to control the working state of the low-voltage generator 111, rectify and stabilize the three-phase alternating current generated by the low-voltage generator 111, and then output stable direct current. The rated voltages of both the low-voltage generator 111 and the low-voltage generator controller 112 are 48V.

[0033] It should be noted that, as Figure 3 shown, the low-voltage generator 111 is a starting generator. That is, the generator has a starter function. The 48V low-voltage battery 12 provides energy to the 48V low-voltage generator 111 to drive the crankshaft of the engine 10 to rotate and start the engine 10.

[0034] It should be noted that by setting the 48V low-voltage power generation device 11 on the engine 10, the voltage is increased, the current is reduced, and the power generation power of the generator is increased. When working as a starter, it can provide greater starting ability and faster response speed.

[0035] It should be noted that the 48V low-voltage generator 111 and the 48V low-voltage generator controller 112 are integrated into one body.

[0036] In one embodiment, as Figures 1 to 3As shown, the voltage regulation and power distribution device 2 includes a boost DCDC regulator 21 and a high-voltage power distribution box 22. The boost DCDC regulator 21 is electrically connected to the low-voltage power supply 1, the boost DCDC regulator 21 is electrically connected to the high-voltage power distribution box 22, and the high-voltage power distribution box 22 is electrically connected to the high-voltage heat dissipation device 3. The boost DCDC regulator 21 raises the 48V voltage to a high-voltage such as 350V, 550V, 800V, etc., and supplies it to the high-voltage heat dissipation device 3.

[0037] Furthermore, the boost DCDC regulator 21 is an isolated DCDC regulator. The isolated DCDC regulator electrically isolates the low-voltage circuit of the 48V power generation system from the high-voltage heat dissipation device 3 with a 550V electrical circuit, making it an electrically isolated and independent non-grounded safety system to prevent the occurrence of indirect electric shock hazards, enhance the safety of the circuit system, reduce the mutual interference between the low-voltage 48V and high-voltage 550V circuits, and reduce noise. The output of the boost DCDC regulator 21 adopts constant voltage control and outputs in a constant voltage mode. A high-voltage power distribution box 22 is provided at the output end of the boost DCDC regulator 21 for distributing the high voltage to multiple high-voltage components for use.

[0038] It is worth noting that the boost DCDC regulator 21 and the high-voltage power distribution box 22 are integrated into one body.

[0039] In one embodiment, as Figure 2 and Figure 3 shown, the engine cooling system further includes a high-voltage electrical component 4, and the high-voltage power distribution box 22 is electrically connected to the high-voltage electrical component 4. Specifically, the high-voltage electrical component 4 can be a high-voltage air-conditioning compressor or other types of high-voltage components.

[0040] In one embodiment, as Figure 2 and Figure 3 shown, the voltage regulation and power distribution device 2 further includes a buck DCDC regulator 23. The low-voltage power supply 1 is electrically connected to the buck DCDC regulator 23, and the engine cooling system further includes a low-voltage electrical component 5, and the buck DCDC regulator 23 is electrically connected to the low-voltage electrical component 5.

[0041] Specifically, the step-down DCDC regulator 23 reduces the 48V voltage to a low voltage of 12V / 24V, retaining the original vehicle's 12V / 24V low-voltage system. Therefore, the original vehicle's low-voltage electrical components 5 can continue to be used, reducing the change in vehicle state. The vehicle can form a three-voltage platform circuit of 12V / 24V, 48V, and 550V, providing power for components with different voltage levels on the vehicle, bringing more flexibility to the selection of vehicle components, and reducing the vehicle development cost and cycle. For example, 12V / 24V is provided to the vehicle's conventional lights, instruments, etc.; 48V is provided to some 48V electrical components that require high power and small current; 550V is provided to the high-voltage fan 32, high-voltage air-conditioning compressor, etc.

[0042] In one embodiment, as Figure 2 and Figure 3 shown, the engine cooling system further includes a second low-voltage battery 6. The step-down DCDC regulator 23 is electrically connected to the second low-voltage battery 6, and the voltage of the second low-voltage battery 6 is lower than the voltage of the low-voltage battery 12. The power after being stepped down by the step-down DCDC regulator 23 can charge the second low-voltage battery 6 to utilize the second low-voltage battery 6 to store power. Further, the second low-voltage battery 6 is a 12V / 24V voltage battery.

[0043] In one embodiment, as Figure 1 shown, the high-voltage cooling device 3 includes a radiator 31 and a high-voltage fan 32. The voltage regulation and power distribution device 2 is electrically connected to the high-voltage fan 32. The radiator 31 is adapted to exchange heat with the engine 10, and the high-voltage fan 32 is adapted to dissipate heat from the radiator 31. The coolant of the engine 10 flows through the radiator 31, and the heat of the radiator 31 is taken away by the rotation of the high-voltage fan 32 to achieve the cooling purpose.

[0044] It should be noted that one high-voltage fan 32 can be provided, or several high-voltage fans 32 can be provided. In this embodiment, the rated voltage of the high-voltage fan 32 is 550V.

[0045] In one embodiment, as Figure 1 shown, the engine cooling system further includes a system controller 7. The system controller 7 is electrically connected to the low-voltage power supply 1, the voltage regulation and power distribution device 2, and the high-voltage cooling device 3. Specifically, the system controller 7 is electrically connected to the low-voltage generator controller 112, the low-voltage battery 12, the boost DCDC regulator 21, and the high-voltage fan 32.

[0046] It should be noted that the system controller 7 is used to control the start and stop of the boost DCDC regulator 21, and control the power generation power of the 48V low-voltage power generation device 11 according to the state of charge (SOC) of the 48V low-voltage battery 12 and the real-time power consumption of the high-voltage fan 32; when the state of charge (SOC) of the 48V low-voltage battery 12 is relatively high, the low-voltage generator 111 may not be started, and the energy of the 48V low-voltage battery 12 is directly used to provide the energy required to drive the high-voltage fan 32 for the engine 10 to dissipate heat; and the rotation speed of the high-voltage fan 32 is controlled according to the heat dissipation requirement of the engine 10.

[0047] Furthermore, as Figure 1 shown, temperature sensors are provided at the water inlet and outlet of the radiator 31, and the temperature signals collected by the temperature sensors are transmitted to the system controller 7. The system controller 7 receives the heat dissipation requirement instruction sent by the engine 10, controls the rotation speed of the high-voltage fan 32, and feeds back the temperature signal to the engine controller.

[0048] According to an embodiment of the present invention, on the other hand, a vehicle is also provided, including the above-mentioned engine cooling system.

[0049] It should be noted that a vehicle equipped with the engine cooling system of this embodiment can provide a high-voltage power supply for the high-voltage fan 32, can adjust the working state and rotation speed of the high-voltage fan 32 according to the heat dissipation requirement of the engine 10, reduce the loss caused by the vehicle engine 10 directly driving the fan through the pulley, reduce the overall vehicle power consumption, and improve the fuel efficiency.

[0050] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An engine cooling system, characterized in that, Comprising: A low-voltage power supply (1); A voltage regulating power distribution device (2), electrically connected to the low-voltage power supply (1), and the voltage regulating power distribution device (2) is adapted to raise the low voltage of the low-voltage power supply (1) to a high voltage and transmit it; A high-voltage heat dissipation device (3), electrically connected to the voltage regulating power distribution device (2), and the high-voltage heat dissipation device (3) is adapted to receive the high voltage transmitted by the voltage regulating power distribution device (2); The voltage regulating power distribution device (2) includes a boost DCDC regulator (21) and a high-voltage power distribution box (22), the boost DCDC regulator (21) is electrically connected to the low-voltage power supply (1), the boost DCDC regulator (21) is electrically connected to the high-voltage power distribution box (22), and the high-voltage power distribution box (22) is electrically connected to the high-voltage heat dissipation device (3).

2. The engine cooling system according to claim 1, wherein, The low-voltage power supply (1) includes a low-voltage power generation device (11) and a low-voltage battery (12), the low-voltage power generation device (11) is electrically connected to the low-voltage battery (12), and the low-voltage battery (12) is electrically connected to the voltage regulating power distribution device (2).

3. The engine cooling system according to claim 2, wherein The low-voltage power generation device (11) includes a low-voltage generator (111) and a low-voltage generator controller (112), the low-voltage generator controller (112) is electrically connected to both the low-voltage generator (111) and the low-voltage battery (12), and the low-voltage generator (111) is adapted to be drivingly connected to an engine (10).

4. The engine cooling system according to claim 3, characterized in that, The low-voltage generator (111) is a starting generator.

5. The engine cooling system according to any one of claims 1 to 4, characterized in that The engine (10) cooling system further includes a high-voltage electrical component (4), and the high-voltage power distribution box (22) is electrically connected to the high-voltage electrical component (4).

6. The engine cooling system according to any one of claims 1 to 4, characterized in that, The voltage regulating power distribution device (2) further includes a buck DCDC regulator (23), the low-voltage power supply (1) is electrically connected to the buck DCDC regulator (23), the engine (10) cooling system further includes a low-voltage electrical component (5), and the buck DCDC regulator (23) is electrically connected to the low-voltage electrical component (5).

7. The engine cooling system according to claim 6, wherein The engine (10) cooling system further includes a second low-voltage battery (6), the buck DCDC regulator (23) is electrically connected to the second low-voltage battery (6), and the voltage of the second low-voltage battery (6) is lower than the voltage of the low-voltage battery (12).

8. The engine cooling system according to any one of claims 1 to 4, characterized in that, The high-voltage heat dissipation device (3) includes a radiator (31) and a high-voltage fan (32), the voltage regulating power distribution device (2) is electrically connected to the high-voltage fan (32), the radiator (31) is adapted to exchange heat with the engine (10), and the high-voltage fan (32) is adapted to dissipate heat from the radiator (31); and / or, The engine (10) cooling system further includes a system controller (7), and the system controller (7) is electrically connected to the low-voltage power supply (1), the voltage regulating power distribution device (2), and the high-voltage heat dissipation device (3).

9. A vehicle, characterized in that, Including the engine (10) cooling system according to any one of claims 1 to 8.

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