Device and method for optimizing energy consumption of cooling fan of automobile thermal management system

Abstract

The invention relates to the technical field of automobile thermal management, and discloses an automobile thermal management system cooling fan energy consumption optimizing device which comprises a condenser and a low-temperature radiator and further comprises a cooling fan, the condenser is located between the cooling fan and the low-temperature radiator, and a pressure sensor is arranged at a refrigerant outlet of the condenser. A cooling liquid inlet of the low-temperature radiator is provided with a temperature sensor, and a gear with the most economical energy consumption of the cooling fan is selected according to the condenser pressure obtained by the pressure sensor and the low-temperature radiator temperature obtained by the temperature sensor. The invention further discloses an optimization method of the energy consumption optimization device for the cooling fan of the automobile thermal management system. According to the energy consumption optimizing device and method for the cooling fan of the automobile heat management system, the energy consumption of the heat management system of the new energy automobile is reduced and the electricity consumption of the new energy automobile is saved under the condition that the comfort of a cab and the cooling requirements of a motor, electric control and a battery are met.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile thermal management, and in particular to an energy consumption optimization device and an optimization method for a cooling fan of an automobile thermal management system. Background Art

[0002] Vehicles, especially new energy vehicles, will generate a lot of heat during operation. For example, the air-conditioning system will generate a certain amount of heat during operation. The vehicle thermal management subsystems such as the engine cooling system, electric drive unit, power electronic mold / electronic drive unit, and battery will generate a lot of heat during operation. In order to ensure that the above systems can work normally, vehicle cooling fans are usually used to cool and dissipate heat for the above systems.

[0003] The cooling temperature generated by the same vehicle cooling fan depends critically on the speed of the vehicle cooling fan, which is driven by a motor. In the prior art, vehicle cooling fans are mostly in the same speed state, and at the initial stage of vehicle operation, the heat dissipation of each cooling system is small, and after the vehicle has been running for a long time, the heat dissipation of each cooling system is large, resulting in the vehicle temperature being too low at the initial stage of operation and too high after a long time of operation. Both too low and too high temperatures of the heat dissipation components are not conducive to the normal operation of the vehicle.

[0004] Some new energy thermal management cooling fan control strategies also divide the cooling fan into high, medium and low gears, resulting in unreasonable fan power consumption and energy waste. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies of the above-mentioned technologies and to provide an energy consumption optimization device and an optimization method for the cooling fan of an automobile thermal management system, so as to reduce the energy consumption of the thermal management system of new energy vehicles and save electricity consumption of new energy vehicles while meeting the comfort of the cab and the cooling requirements of the motor, electronic control and battery.

[0006] To achieve the above-mentioned purpose, the automotive thermal management system cooling fan energy consumption optimization device involved in the present invention includes a condenser and a low-temperature radiator, and also includes a cooling fan. The condenser is located between the cooling fan and the low-temperature radiator. The refrigerant outlet of the condenser is provided with a pressure sensor, and the coolant inlet of the low-temperature radiator is provided with a temperature sensor. According to the condenser pressure obtained by the pressure sensor and the low-temperature radiator temperature obtained by the temperature sensor, the most energy-economical gear of the cooling fan is selected.

[0007] Preferably, the condenser is provided with an air collecting hood, and the cooling fan is installed in the air collecting hood.

[0008] Preferably, the coolant of the low-temperature radiator has a 2-circuit flow path with top inlet and bottom outlet, and the refrigerant of the condenser has a 4-circuit flow path with top inlet and bottom outlet, and the coolant outlet circuit of the low-temperature radiator has the same flow direction as the refrigerant outlet circuit of the condenser.

[0009] An optimization method for an energy consumption optimization device for a cooling fan of an automobile thermal management system, obtaining a design pressure value P of the condenser 额 and the design temperature value T of the low temperature radiator 额 , the condenser pressure P is obtained in real time through the pressure sensor 冷 , the low temperature radiator temperature T is obtained in real time through the temperature sensor 散 , get the condenser pressure difference ΔP=P 冷 -P 额 The temperature difference between the low temperature radiator and the low temperature radiator is ΔT = T 散 -T 额 , a plurality of gears are set from small to large according to the rotation speed of the cooling fan, and when the condenser pressure difference ΔP or the low-temperature radiator temperature difference ΔT increases, the gear of the cooling fan is increased.

[0010] Preferably, the condenser pressure difference ΔP corresponds to different gears, and the low-temperature radiator temperature difference ΔT corresponds to different gears, and the gear of the cooling fan is not lower than the gear corresponding to the current condenser pressure difference ΔP and the gear corresponding to the current low-temperature radiator temperature difference ΔT.

[0011] Preferably, the speed of the cooling fan is set to gear 1, gear 2, gear 3, gear 4 and gear 5 from small to large, the condenser pressure difference ΔP is 0, ΔP1, ΔP2, ΔP3, ΔP4 and ΔP5 from small to large, and the low-temperature radiator temperature difference ΔT is 0, ΔT1, ΔT2, ΔT3, ΔT4 and ΔT5 from small to large. When ΔP=0 and ΔT=0, the cooling fan does not start. When ΔP exceeds ΔP1, ΔP2, ΔP3, ΔP4 and ΔP5, the gear of the cooling fan is adjusted to gear 1, gear 2, gear 3, gear 4 and gear 5 in sequence. When ΔT exceeds ΔT1, ΔT2, ΔT3, ΔT4 and ΔT5, the gear of the cooling fan is adjusted to gear 1, gear 2, gear 3, gear 4 and gear 5 in sequence.

[0012] Preferably, when adjusting the gear position of the cooling fan, the current gear position needs to satisfy the gear position requirements of ΔP and ΔT at the same time.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] 1. Automatically select the appropriate gear of the cooling fan through the temperature difference and pressure difference to achieve energy-saving optimization effect;

[0015] 2. The flow path structure and inlet and outlet of the condenser refrigerant and low-temperature radiator coolant circuits are kept consistent to improve system performance;

[0016] 3. The fan control strategy is intuitive and concise, and easy to control;

[0017] 4. Assemble the condenser, low-temperature radiator and cooling fan together to form a cooling module with a compact structure;

[0018] 5. Effectively control the energy consumption of the new energy thermal management system, so that the system can play its role just right. On the one hand, it maintains the optimal operating temperature of the motor, electronic control, and battery; on the other hand, it meets the cooling requirements in the cab and maintains a comfortable driving environment. It effectively prevents excess capacity from increasing energy consumption, and provides support for achieving the ultimate energy consumption of the thermal management system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the energy consumption optimization device for cooling fans of an automobile thermal management system of the present invention;

[0020] Figure 2 for Figure 1 A schematic diagram of the structure from another perspective;

[0021] Figure 3 It is a schematic diagram of the energy consumption optimization device for cooling fans of an automobile thermal management system of the present invention;

[0022] Figure 4 It is the flow diagram of the coolant;

[0023] Figure 5 This is the refrigerant flow diagram.

[0024] The components in the figure are numbered as follows:

[0025] Condenser 1, low-temperature radiator 2, cooling fan 3, refrigerant outlet 4, pressure sensor 5, coolant inlet 6, temperature sensor 7, air collecting hood 8, refrigerant inlet 9, coolant outlet 10. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] like Figure 1 , Figure 2 and Figure 3 As shown, a cooling fan energy consumption optimization device for an automobile thermal management system includes a condenser 1 and a low-temperature radiator 2, and also includes a cooling fan 3. The condenser 1 is located between the cooling fan 3 and the low-temperature radiator 2. The refrigerant outlet 4 of the condenser 1 is provided with a pressure sensor 5, and the coolant inlet 6 of the low-temperature radiator 2 is provided with a temperature sensor 7. According to the condenser pressure obtained by the pressure sensor 5 and the low-temperature radiator temperature obtained by the temperature sensor 7, the most energy-efficient gear of the cooling fan 3 is selected.

[0030] The condenser 1 is provided with an air collecting hood 8 , and the cooling fan 3 is installed in the air collecting hood 8 .

[0031] In addition, combined Figure 4 and Figure 5 As shown, the coolant of the low-temperature radiator 2 enters from the top and exits from the bottom, with a two-circuit flow path, and the refrigerant of the condenser 1 enters from the top and exits from the bottom, with a four-circuit flow path, and the coolant outlet circuit of the low-temperature radiator 2 has the same flow direction as the refrigerant outlet circuit of the condenser 1.

[0032] When the cooling fan energy consumption optimization device of the automobile thermal management system of this embodiment is used, the design pressure value P of the condenser 1 is obtained. 额 and the design temperature value T of the low temperature radiator 2 额 , the condenser pressure P is obtained in real time through the pressure sensor 5 冷 , obtain the low temperature radiator temperature T in real time through the temperature sensor 7 散 , get the condenser pressure difference ΔP=P冷 -P 额 The temperature difference between the low temperature radiator and the low temperature radiator is ΔT = T 散 -T 额 , a number of gears are set from small to large according to the rotation speed of the cooling fan 3. When the condenser pressure difference ΔP or the low-temperature radiator temperature difference ΔT increases, the gear of the cooling fan 3 is increased.

[0033] Among them, the condenser pressure difference ΔP corresponds to different gears, the low-temperature radiator temperature difference ΔT corresponds to different gears, and the gear of the cooling fan 3 is not lower than the gear corresponding to the current condenser pressure difference ΔP and the gear corresponding to the current low-temperature radiator temperature difference ΔT.

[0034] In other schemes, the speed of the cooling fan 3 can be set from small to large to 1st gear, 2nd gear, 3rd gear, 4th gear and 5th gear, the condenser pressure difference ΔP from small to large is 0, ΔP1, ΔP2, ΔP3, ΔP4 and ΔP5, the low-temperature radiator temperature difference ΔT from small to large is 0, ΔT1, ΔT2, ΔT3, ΔT4 and ΔT5, when ΔP=0 and ΔT=0, the cooling fan 3 does not start, when ΔP exceeds ΔP1, ΔP2, ΔP3, ΔP4 and ΔP5, the gear of the cooling fan 3 is adjusted to 1st gear, 2nd gear, 3rd gear, 4th gear and 5th gear, when ΔT exceeds ΔT1, ΔT2, ΔT3, ΔT4 and ΔT5, the gear of the cooling fan 3 is adjusted to 1st gear, 2nd gear, 3rd gear, 4th gear and 5th gear.

[0035] More preferably, when adjusting the gear position of the cooling fan 3, the current gear position needs to satisfy the gear position requirements of ΔP and ΔT at the same time.

[0036] Taking the cooling fan 3 of a certain vehicle model as an example, assuming that the speed of the cooling fan 3 is set from small to large to 800 rpm in the first gear, 1200 rpm in the second gear, 2000 rpm in the third gear, 3000 rpm in the fourth gear and 4000 rpm in the fifth gear, ΔP1, ΔP2, ΔP3, ΔP4 and ΔP5 are 0.1MPa, 0.3MPa, 0.5MPa, 0.8Mpa and 1.2MPa respectively, ΔT1, ΔT2, ΔT3, ΔT4 and ΔT5 are 5℃, 10℃, 20℃, 30℃ and 45℃ respectively, then the logic for executing the cooling fan 3 gears is as follows:

[0037] When ΔP≤0MPa and ΔT≤0, the speed N rpm =0, off gear;

[0038] When ΔP≤0MPa, and 0≤ΔT≤5℃, the speed N rpm =800, 1st gear;

[0039] When ΔP≤0MPa and 5<ΔT≤10℃, the speed N rpm =1200, 2nd gear;

[0040] When ΔP≤0MPa and 10<ΔT≤20℃, the speed N rpm =2000, 3rd gear;

[0041] When ΔP≤0MPa and 20<ΔT≤30℃, the speed N rpm =3000, 4th gear;

[0042] When ΔP≤0MPa and 30<ΔT≤45℃, the speed N rpm =4000, 5th gear;

[0043] When 0MPa<ΔP≤0.1MPa, and 0≤ΔT≤5℃, the speed N rpm =800, 1st gear;

[0044] When 0MPa<ΔP≤0.1MPa, and 5<ΔT≤10℃, the speed N rpm =800, 1st gear;

[0045] When 0MPa<ΔP≤0.1MPa, and 10<ΔT≤20℃, the speed N rpm =1200, 2nd gear;

[0046] When 0MPa<ΔP≤0.1MPa, and 10<ΔT≤20℃, the speed N rpm =2000, 3rd gear;

[0047] When 0MPa<ΔP≤0.1MPa, and 20<ΔT≤30℃, the speed N rpm =3000, 4th gear;

[0048] When 0MPa<ΔP≤0.1MPa, and 30<ΔT≤45℃, the speed N rpm =4000, 5th gear;

[0049] When 0.1MPa<ΔP≤0.3MPa, and 0≤ΔT≤5℃, the speed N rpm =1200, 2nd gear;

[0050] When 0.1MPa<ΔP≤0.3MPa, and 5<ΔT≤10℃, the speed N rpm =1200, 2nd gear;

[0051] When 0.1MPa<ΔP≤0.3MPa, and 10<ΔT≤20℃, the speed N rpm =1200, 2nd gear;

[0052] When 0.1MPa<ΔP≤0.3MPa, and 10<ΔT≤20℃, the speed N rpm=2000, 3rd gear;

[0053] When 0.1MPa<ΔP≤0.3MPa, and 20<ΔT≤30℃, the speed N rpm =3000, 4th gear;

[0054] When 0.1MPa<ΔP≤0.3MPa, and 30<ΔT≤45℃, the speed N rpm =4000, 5th gear;

[0055] When 0.3MPa<ΔP≤0.5MPa, and 0≤ΔT≤5℃, the speed N rpm =2000, 3rd gear;

[0056] When 0.3MPa<ΔP≤0.5MPa, and 5<ΔT≤10℃, the speed N rpm =2000, 3rd gear;

[0057] When 0.3MPa<ΔP≤0.5MPa, and 10<ΔT≤20℃, the speed N rpm =2000, 3rd gear;

[0058] When 0.3MPa<ΔP≤0.5MPa, and 10<ΔT≤20℃, the speed N rpm =2000, 3rd gear;

[0059] When 0.3MPa<ΔP≤0.5MPa, and 20<ΔT≤30℃, the speed N rpm =3000, 4th gear;

[0060] When 0.3MPa<ΔP≤0.5MPa, and 30<ΔT≤45℃, the speed N rpm =4000, 5th gear;

[0061] When 0.5MPa<ΔP≤0.8MPa, and 0≤ΔT≤5℃, the speed N rpm =3000, 4th gear;

[0062] When 0.5MPa<ΔP≤0.8MPa, and 5<ΔT≤10℃, the speed N rpm =3000, 4th gear;

[0063] When 0.5MPa<ΔP≤0.8MPa, and 10<ΔT≤20℃, the speed N rpm =3000, 4th gear;

[0064] When 0.5MPa<ΔP≤0.8MPa, and 10<ΔT≤20℃, the speed N rpm =3000, 4th gear;

[0065] When 0.5MPa<ΔP≤0.8MPa, and 20<ΔT≤30℃, the speed N rpm =3000, 4th gear;

[0066] When 0.5MPa<ΔP≤0.8MPa, and 30<ΔT≤45℃, the speed N rpm =4000, 5th gear;

[0067] When 0.8MPa<ΔP≤1.2MPa, and 0≤ΔT≤5℃, the speed N rpm =4000, 5th gear;

[0068] When 0.8MPa<ΔP≤1.2MPa, and 5<ΔT≤10℃, the speed N rpm =4000, 5th gear;

[0069] When 0.8MPa<ΔP≤1.2MPa, and 10<ΔT≤20℃, the speed N rpm =4000, 5th gear;

[0070] When 0.8MPa<ΔP≤1.2MPa, and 10<ΔT≤20℃, the speed N rpm =4000, 5th gear;

[0071] When 0.8MPa<ΔP≤1.2MPa, and 20<ΔT≤30℃, the speed N rpm =4000, 5th gear;

[0072] When 0.8MPa<ΔP≤1.2MPa, and 30<ΔT≤45℃, the speed N rpm =4000, 5th gear.

[0073] The summary is as follows:

[0074] Table 1 Cooling fan gear table

[0075]

[0076] The automotive thermal management system cooling fan energy consumption optimization device and optimization method of the present invention automatically select a reasonable gear of the cooling fan through temperature difference and pressure difference to achieve energy-saving optimization effect; the condenser refrigerant and low-temperature radiator coolant loop flow channel structure and the inlet and outlet are kept consistent to improve system performance; the fan control strategy method is intuitive and concise, and the control is convenient; the condenser 1, the low-temperature radiator 2, and the cooling fan 3 are assembled together to form a cooling module with a compact structure; the energy consumption of the new energy thermal management system is effectively controlled, and the system can be properly utilized to maintain the optimal operating temperature of the motor, electronic control, and battery on the one hand, and to meet the cooling requirements in the cab on the other hand, maintain a comfortable driving environment, effectively prevent excess capacity from increasing energy consumption, and provide support for achieving the ultimate energy consumption of the thermal management system.

[0077] It should be noted that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solutions of the present invention are limited only by the scope of the claims.

[0078] Finally, it should be pointed out that the above content is a further detailed description of the invention in combination with specific implementation methods. It cannot be considered that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, simple replacements made without departing from the concept of the present invention should be regarded as belonging to the protection scope of the present invention. The above embodiments are only more representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there can be many variations. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.

[0079] For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, and the above structures should be regarded as belonging to the protection scope of the present invention.

Claims

1. A cooling fan energy consumption optimization device for an automobile thermal management system, comprising a condenser (1) and a low-temperature radiator (2), characterized in that: The invention also comprises a cooling fan (3), wherein the condenser (1) is located between the cooling fan (3) and the low-temperature radiator (2), the refrigerant outlet (4) of the condenser (1) is provided with a pressure sensor (5), and the coolant inlet (6) of the low-temperature radiator (2) is provided with a temperature sensor (7), and the gear of the cooling fan (3) with the most economical energy consumption is selected according to the condenser pressure obtained by the pressure sensor (5) and the low-temperature radiator temperature obtained by the temperature sensor (7).

2. The energy consumption optimization device for cooling fans of an automobile thermal management system according to claim 1, characterized in that: The condenser (1) is provided with an air collecting hood (8), and the cooling fan (3) is installed in the air collecting hood (8).

3. The energy consumption optimization device for cooling fans of an automobile thermal management system according to claim 1, characterized in that: The coolant of the low-temperature radiator (2) has a two-circuit flow path with the coolant entering from the top and exiting from the bottom, and the refrigerant of the condenser (1) has a four-circuit flow path with the coolant entering from the top and exiting from the bottom, and the coolant outlet circuit of the low-temperature radiator (2) has the same flow direction as the refrigerant outlet circuit of the condenser (1).

4. An optimization method for the cooling fan energy consumption optimization device of an automobile thermal management system according to any one of claims 1 to 3, characterized in that: Obtain the design pressure value P of the condenser (1) 额 and the design temperature value T of the low temperature radiator (2) 额 , the condenser pressure P is obtained in real time through the pressure sensor (5) 冷 , the low temperature radiator temperature T is obtained in real time through the temperature sensor (7) 散 , get the condenser pressure difference ΔP=P 冷 -P 额 The temperature difference between the low temperature radiator and the low temperature radiator is ΔT = T 散 -T 额 , a plurality of gears are set from small to large according to the rotation speed of the cooling fan (3), and when the condenser pressure difference ΔP or the low-temperature radiator temperature difference ΔT increases, the gear of the cooling fan (3) is increased.

5. The optimization method of the cooling fan energy consumption optimization device of the automotive thermal management system according to claim 4 is characterized in that: The condenser pressure difference ΔP corresponds to different gears, and the low-temperature radiator temperature difference ΔT corresponds to different gears, and the gear of the cooling fan (3) is not lower than the gear corresponding to the current condenser pressure difference ΔP and the gear corresponding to the current low-temperature radiator temperature difference ΔT.

6. The optimization method of the cooling fan energy consumption optimization device of the automotive thermal management system according to claim 4 is characterized by: The rotation speed of the cooling fan (3) is set from small to large to gear 1, gear 2, gear 3, gear 4 and gear 5, the condenser pressure difference ΔP is sequentially 0, ΔP1, ΔP2, ΔP3, ΔP4 and ΔP5 from small to large, and the low-temperature radiator temperature difference ΔT is sequentially 0, ΔT1, ΔT2, ΔT3, ΔT4 and ΔT5 from small to large. When ΔP=0 and ΔT=0, the cooling fan (3) does not start. When ΔP exceeds ΔP1, ΔP2, ΔP3, ΔP4 and ΔP5, the gear position of the cooling fan (3) is sequentially adjusted to gear 1, gear 2, gear 3, gear 4 and gear 5. When ΔT exceeds ΔT1, ΔT2, ΔT3, ΔT4 and ΔT5, the gear position of the cooling fan (3) is sequentially adjusted to gear 1, gear 2, gear 3, gear 4 and gear 5.

7. The optimization method of the cooling fan energy consumption optimization device of the automotive thermal management system according to claim 6 is characterized by: When adjusting the gear position of the cooling fan (3), the current gear position must simultaneously meet the gear position requirements of ΔP and ΔT.

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