A cooling system and control method for a hybrid engine supercharger

Abstract

The invention discloses a cooling system of a hybrid engine supercharger and a control method thereof, and relates to the technical field of supercharger heat dissipation. The system comprises a water system, an oil system, a temperature acquisition system, a heat storage and release component, a controller and an engine speed sensor. The control method of the heat dissipation system is to first determine the current working state of the engine, then obtain the current engine oil temperature, supercharger oil temperature and ambient temperature and cooling water temperature, and then the controller compares and processes the received supercharger oil temperature and engine oil temperature information with the ambient temperature information, sends signals to an external electronic water pump, an external electronic oil pump, an engine radiator and a flow valve, and adjusts their working states in real time. The cooling system and the control method can realize the heat dissipation of the supercharger under different ambient temperatures and the supercharger's own temperature, so as to achieve the purpose of reducing heat dissipation energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of supercharger heat dissipation, and in particular to a cooling system of a hybrid engine supercharger and a control method thereof. Background Art

[0002] Currently, hybrid vehicles are equipped with turbochargers mainly to improve engine performance and efficiency. By using exhaust gas to drive the turbine to compress the air entering the engine, more fuel can be burned in the same amount of time, thereby increasing power output while reducing fuel consumption.

[0003] As the air flows through the turbocharger, its temperature will rise, which will cause the temperature of the turbocharger to rise. Even if the engine has stopped running, the temperature inside the turbocharger will still be very high, and the various components of the cooling system will also dissipate waste heat. This waste heat will cause the turbocharger components, such as bearings and seals, to age or be damaged prematurely, causing the oil film to deteriorate. The mechanical properties of the heated parts will decline due to lack of cooling, accelerating the damage of the turbocharger and other parts.

[0004] A delayed water cooling device is disclosed in a Chinese utility model patent with publication number CN204532526U. In the patent, a delayed water pump and a cooling water circuit are provided on the supercharger, and the operation of the delayed water pump is controlled by judging the working time and working conditions of the engine, so as to achieve the purpose of delayed cooling and temperature reduction to protect the supercharger.

[0005] However, this patent ignores the fact that the heat dissipation of the engine oil and coolant themselves is different under different ambient temperatures. For example, in a low-temperature environment, the coolant dissipates heat faster, and the required heat dissipation is different at different oil temperatures. For example, when the oil temperature is not high, the delayed water pump runs at full power, which will cause energy waste. However, in the above-mentioned patent documents, it only controls the operation of the delayed water pump according to the engine's working time, the engine's status and the battery's power. It is impossible to control the cooling system in real time according to the real-time temperature of the engine and supercharger and the ambient temperature to adjust the heat dissipation, which wastes energy. The heat dissipation cooling of the supercharger during shutdown needs to be optimized. Summary of the invention

[0006] An object of the present invention is to provide a cooling system for a hybrid engine supercharger and a control method thereof.

[0007] To achieve the above object, the present invention is implemented by the following technical solutions: A cooling system for a hybrid engine supercharger, including a water system, an oil system, a temperature acquisition system, a controller and an engine speed sensor;

[0008] The water system includes an engine water pump, an engine water jacket, a supercharger water jacket, an engine radiator and an external electronic water pump forming a closed loop;

[0009] The oil system includes an engine oil pump, an engine, a supercharger, an engine oil sump, an oil cooler and an external electronic oil pump forming a closed loop;

[0010] Wherein, the temperature acquisition system is used to collect the water temperature of the water system, the oil temperature of the oil system and the ambient temperature, and is connected to the controller by electrical signals;

[0011] The engine water pump is connected in parallel with the external electronic water pump in the water system, and the engine water jacket and the supercharger water jacket are connected in parallel in the water system; the water outlets of the engine water pump and the external electronic water pump are connected to the water inlets of the engine water jacket and the supercharger water jacket, the engine oil pump is connected in parallel with the external electronic oil pump in the oil system, the engine and the supercharger are connected in parallel in the oil system, and the oil outlets of the engine oil pump and the external electronic oil pump are connected to the oil inlets of the engine and the supercharger.

[0012] According to a further technical solution, a first cooling water flow valve and a second cooling water flow valve capable of adjusting the cooling water flow are respectively installed on the water inlets of the supercharger water jacket and the engine water jacket;

[0013] A first oil flow valve and a second oil flow valve capable of adjusting the oil flow are installed on the oil inlet of the engine and the supercharger.

[0014] According to a further technical solution, the engine radiator includes cooling fins and an electronic fan, and an oil cooler and a heat storage component are arranged between the engine oil pan and the engine oil pump.

[0015] The control method of the cooling system includes:

[0016] S1. Determine the current working state of the engine;

[0017] S2, obtaining the current engine oil temperature, supercharger oil temperature, ambient temperature and cooling water temperature;

[0018] S3. Adjusting the working state of the cooling system in real time based on the ambient temperature, the supercharger oil temperature, the engine oil temperature and the cooling water temperature.

[0019] In a further technical solution, the working state of the engine includes shutdown and operation, the supercharger oil temperature is T, the threshold value of the supercharger oil temperature includes T1, T2 and a warning temperature value T0, and the minimum ideal working temperature of the supercharger oil temperature is T 理, where T 理 <T1<T2<T0, the engine oil temperature is t, and the minimum ideal operating temperature of the engine oil temperature is t 理 , the threshold of the engine oil temperature is set to t0, and the ambient temperature is set to t 环 , the cooling water temperature is t 水 ;

[0020] S101. If the engine stops:

[0021] If K1*T2<T≤T0, then enter S301, K1 is pre-calibrated according to different ambient temperatures;

[0022] S301, the external electronic water pump, the external electronic oil pump and the electronic fan are operated at maximum power until the supercharger oil temperature T≤K1*T2, and then return to S1;

[0023] If K1*T1<T≤K1*T2, then go to S302;

[0024] S302, adjusting the power of the external electronic water pump and the external electronic oil pump in real time according to the ambient temperature and the supercharger oil temperature, and adjusting the real-time speed of the electronic fan in real time according to the cooling water temperature, until T≤K1*T1, or T>K1*T2, and returning to S1;

[0025] If T≤K1*T1, go to S303;

[0026] S303, the external electronic water pump and the external electronic oil pump are turned off, the electronic fan is stopped, and the process returns to S1;

[0027] If T>T0, then go to S304;

[0028] S304: The external electronic water pump, the external electronic oil pump and the electronic fan operate at full power until T≤T0, and then return to S1.

[0029] A further technical solution is that in the steps S301 and S302, the magnitude relationship between T and t is determined to determine the flow rates of cooling water and engine oil flowing into the supercharger and the engine;

[0030] The real-time flow ratio of the flow rate Q1 of the first cooling water flow valve to the flow rate Q2 of the second cooling water flow valve is Q1:Q2=K2*(TT 理 ):(tt 理 ), the total cooling water flow is Q 水 , K2 is pre-calibrated according to different ambient temperatures;

[0031] The real-time flow ratio of the flow Q3 of the first oil flow valve to the flow Q4 of the second oil flow valve is Q3:Q4=K2*(TT 理 ):(tt 理 ), the total oil flow is Q 油 ;

[0032] In the step S302, Q 水 and Q 油 The ratio is adjusted in real time according to the ambient temperature, and the ratio is: Q 水 :Q 油 =K3:1, K3 is pre-calibrated according to different ambient temperatures;

[0033] Q 水 =α*(Tt 环 )*Q 常 ;

[0034] α is pre-calibrated according to the cooling system’s own conditions, Q 常 is a pre-calibrated value;

[0035] In the step S304, the first cooling water flow valve, the second cooling water flow valve, the first engine oil flow valve, and the second engine oil flow valve are all opened to the maximum.

[0036] Further technical solution, S102, if the engine is running, the engine oil pump and the engine water pump are working:

[0037] When T≤K1*T1, enter S305;

[0038] S305, the controller controls the external electronic water pump, the external electronic oil pump and the electronic fan to stop until T>K1*T1, or the engine stops, and returns to S1;

[0039] When K1*T1<T≤T0, enter S306;

[0040] S306, the controller controls the external electronic water pump and the external electronic oil pump to not work, and the electronic fan adjusts the speed in real time according to the ambient temperature and the cooling water temperature until T>T0, or T≤K1*T1, or the engine stops, and returns to S1;

[0041] If T>T0, the electronic fan runs at full power, and the controller reminds the driver to stop the vehicle and check the idle speed until T≤T0, and then returns to S1.

[0042] According to a further technical solution, if the engine is running, the first oil flow valve and the second oil flow valve are both opened to the maximum, and the first cooling water flow valve and the second cooling water flow valve are both opened to the maximum.

[0043] A further technical solution is that if T>T1, the controller controls the heat storage and release component to store heat and convert thermal energy into electrical energy.

[0044] According to a further technical solution, if the engine is running and the engine oil temperature is less than the engine oil temperature threshold t0, the controller controls the heat storage and release component to release heat, converting electrical energy into thermal energy to heat the engine oil.

[0045] In summary, the present invention has the following beneficial effects: the present invention arranges a separate external electronic oil pump, which is connected in parallel with the engine oil pump, and simultaneously arranges a separate external electronic water pump, which is connected in parallel with the engine water pump. Through such an arrangement, delayed heat dissipation and delayed lubrication of the engine and the supercharger can be achieved when the engine is stopped, ensuring that the supercharger can still dissipate heat after the engine is stopped, thereby extending the service life of the supercharger and reducing the probability of damage.

[0046] Moreover, in the control method of the present invention, the controller, that is, the ECU on-board computer, can adjust the working states of the external electronic oil pump, the external electronic water pump and the electronic fan of the engine radiator in real time according to different ambient temperatures and the oil temperature and cooling water temperature of the supercharger itself, so as to achieve real-time adjustment of the working states of the external electronic oil pump, the external electronic water pump and the electronic fan of the engine radiator according to the temperature of the supercharger oil itself and the temperature difference with the ambient temperature under different ambient temperatures, adjust the heat dissipation capacity of the heat dissipation system when the engine is stopped, and make the heat dissipation system adapt to different ambient temperatures and its own temperature, so as to avoid the situation that the heat dissipation demand is high and the heat dissipation is insufficient, and the heat dissipation demand is low and the heat dissipation is excessive and wastes electric energy, so that the heat dissipation system can achieve a balance between heat dissipation and energy saving.

[0047] Moreover, the present invention connects the engine and the supercharger in parallel in the oil circuit system, connects the engine water jacket and the supercharger water jacket in parallel in the water circuit system, and sets two parallel cooling water flow valves for respectively controlling the flow of cooling water into the engine water jacket and the supercharger water jacket, and sets two parallel engine oil flow valves for respectively controlling the engine oil flow into the engine and the supercharger, so that the cooling water and engine oil flow rates flowing into the supercharger water jacket and the engine water jacket can be respectively controlled according to the difference between the engine oil temperature of the supercharger and the engine, so that the flow rates of cooling water and engine oil can be distributed according to the different engine oil temperatures of the supercharger and the engine, and heat dissipation can be balanced.

[0048] Moreover, in the control method of the present invention, since the heat dissipation capabilities of the engine oil and cooling water are different at different ambient temperatures, for example, when the ambient temperature is low, the cooling water has a stronger heat dissipation capability and dissipates more heat. Therefore, in the present invention, the controller can control the working status of the external electronic water pump and the external electronic engine oil pump in real time according to the different ambient temperatures when the engine is stopped, so that the total flow rate of cooling water and the total flow rate of engine oil can be adjusted in real time to reduce the loss of electric energy. For example, when the ambient temperature is low, because the cooling water has a better heat dissipation effect, the controller of the present invention can increase the total flow rate of cooling water and reduce the total flow rate of engine oil to balance the heat dissipation efficiency and electric energy loss.

[0049] Moreover, in the present invention, a heat storage and release component is also provided, which can store heat in the oil circuit and the water circuit system, and release heat when the vehicle operation meets the conditions to achieve warm-up of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0051] Figure 1 It is the principle diagram of the control method of the present invention;

[0052] Figure 2 is a numerical parameter table of K1 of the present invention;

[0053] Figure 3 is a numerical parameter table of K2 of the present invention;

[0054] Figure 4 is a numerical parameter table of K3 of the present invention;

[0055] Figure 5 It is a real-time tachometer of the electronic fan at different cooling water temperatures and ambient temperatures;

[0056] Figure 6 is a schematic diagram of the oil circuit system of the present invention;

[0057] Figure 7 is a schematic diagram of the waterway system of the present invention;

[0058] In the figure, 1. supercharger; 2. engine; 3. engine oil pump; 4. external electronic oil pump; 5. engine oil sump; 6. oil cooler; 7. engine water pump; 8. external electronic water pump; 9. second cooling water flow valve; 10. first cooling water flow valve; 11. engine water jacket; 12. supercharger water jacket; 13. heat storage and release component; 14. engine radiator; 15. first oil flow valve; 16. second oil flow valve. DETAILED DESCRIPTION

[0059] The present invention is further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0060] The following is combined with Figure 1 -Attached Figure 7 , the technical solutions in the embodiments of the present application are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0061] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0062] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0063] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0064] In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0065] The present invention provides a cooling system for a hybrid engine supercharger and a control method thereof, wherein the cooling system comprises a water circuit system, an oil circuit system, a temperature acquisition system, a controller and an engine speed sensor.

[0066] The water system includes an engine water pump 7, an engine water jacket 11, a supercharger water jacket 12, an engine radiator 14 and an external electronic water pump 8. The engine water pump 7 is driven to rotate by the engine 2. The engine water pump 7 is connected to the water pipeline of the water system, and then connected to the engine water jacket 11 and the supercharger water jacket 12. The engine water jacket 11 is installed on the engine 2. Cooling water is introduced into the engine water jacket 11 to cool the engine 2. The supercharger water jacket 12 is installed on the supercharger 1 and is connected to the water pipeline. The engine radiator 14 includes cooling fins and an electronic fan. The engine cooling fins are fixed on the water pipeline for heat dissipation. The electronic fan is electrically connected to the vehicle battery. The engine water pump 7, the engine water jacket 11, the supercharger water jacket 12, and the engine radiator 14 form a water system loop.

[0067] Among them, the engine water jacket 11 and the supercharger water jacket 12 are connected in parallel, and the cooling water is branched when flowing through the engine water jacket 11 and the supercharger water jacket 12, and the external electronic water pump 8 is connected in parallel with the engine water pump 7, and the external electronic water pump 8 is electrically connected to the vehicle battery. The water outlets of the engine water pump 7 and the external electronic water pump 8 are connected to the water inlets of the engine water jacket 11 and the supercharger water jacket 12. The external electronic water pump 8 can independently drive the cooling water to circulate in the water system to dissipate heat when the engine 2 is stopped and the engine water pump 7 is not working, thereby achieving the purpose of delayed heat dissipation.

[0068] In one embodiment, the oil circuit system includes an engine oil pump 3, an engine 2, a supercharger 1, an engine oil sump 5, an external electronic oil pump 4 and an oil cooler 6, wherein the engine oil pump 3 is driven by the engine, and the oil circuit system is used for the circulation of oil, and the engine oil pump 3, the engine 2, the supercharger 1, the engine oil sump 5, the oil cooler 6 and the external electronic oil pump 4 form a closed loop, wherein the engine 2 and the supercharger 1 are connected in parallel in the oil circuit system, and the external electronic oil pump 4 and the engine oil pump 3 are also arranged in parallel, the oil outlets of the engine oil pump 3 and the external electronic oil pump 4 are both connected to the oil inlets of the engine 2 and the supercharger 1, the external electronic oil pump 4 is electrically connected to the battery of the vehicle, and the external electronic oil pump 4 can independently drive the oil to circulate in the oil circuit system after the engine 2 is shut down and the engine oil pump 3 is not working, so as to achieve the purpose of delayed lubrication and heat dissipation.

[0069] The temperature acquisition system is used to collect the water temperature of the water system, the oil temperature of the oil system and the ambient temperature. Specifically, it includes a first temperature sensor for collecting the oil temperature of the supercharger, a second temperature sensor for collecting the oil temperature of the engine, a third temperature sensor for collecting the ambient temperature and a fourth temperature sensor for collecting the cooling water temperature. The first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor are electrically connected to the controller. The controller is also called ECU, that is, an on-board computer, which is used to control the working status of various components of the vehicle.

[0070] The controller is also electrically connected to the external electronic oil pump 4, the external electronic water pump 8, and the electronic fan of the engine radiator 14, and is used to control the operating status of various components of the water system and the oil system.

[0071] Specifically, the controller can collect and process temperature signals transmitted from the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor, and send signals to the external electronic oil pump 4, the external electronic water pump 8 and the electronic fan in the engine radiator 14 to control the rotation speed of the external electronic oil pump 4, the external electronic water pump 8 and the electronic fan, so that the working state can be adjusted according to different supercharger oil temperatures, water temperatures and ambient temperatures.

[0072] The engine speed sensor is used to determine the operating status of the engine.

[0073] In one embodiment, the difference between this embodiment and the previous embodiment is that two cooling water flow valves are set in the water system of this embodiment, namely, a first cooling water flow valve 10 and a second cooling water flow valve 9. The first cooling water flow valve 10 is set on the water path on one side of the supercharger water jacket 12, and the second cooling water flow valve 9 is set on the water path on one side of the engine water jacket 11. The controller can control the flow rate of the first cooling water flow valve 10 and the second cooling water flow valve 9.

[0074] In one embodiment, the difference between this embodiment and the previous embodiment is that two oil flow valves are further provided in the oil circuit system of this embodiment, namely a first oil flow valve 15 installed on the oil inlet side of the supercharger 1, and a second oil flow valve 16 installed on the oil inlet side of the engine 2. The two oil flow valves can adjust the oil flow entering the supercharger 1 and the engine 2 respectively under the control of the controller.

[0075] In another embodiment, the difference between this embodiment and the previous embodiment is that a heat storage and release component 13 is added to the oil circuit system, and the heat storage and release component 13 is connected to the controller by electrical signals. The heat storage and release component 13 can convert electrical energy and thermal energy. Specifically, in the process of converting thermal energy into electrical energy, a semiconductor temperature difference type thermoelectric conversion device can be used. For example, a Chinese patent with publication number CN113257985A discloses a semiconductor temperature difference-based thermoelectric conversion device, which can convert thermal energy into electrical energy. In an embodiment of the present invention, the device can be used for thermoelectric conversion, or other similar devices that can convert thermal energy into electrical energy can be used and installed on the oil pipeline of the oil circuit system. When the oil temperature is high, the heat storage and release component 13 can convert The heat energy absorbed by the oil pipeline is converted into electrical energy, and the electrical energy is stored in the vehicle battery for energy storage. When heat release is needed, heat is released through an electric thermal resistor or other device that can convert electrical energy into thermal energy to convert electrical energy into thermal energy. The condition for releasing heat can be triggered when the ambient temperature is low. For example, in winter, due to the low temperature, the oil temperature is low. The low oil temperature has a poor lubrication effect on the engine 2 and the supercharger 1. At this time, the electrical energy can be converted into thermal energy through the heat storage and release component 13 to achieve heating of the oil and achieve the purpose of warming up the car. When the oil reaches a certain temperature, such as 80°C, the heat storage and release component 13 does not release heat. If the engine oil is hot during driving, the thermal energy can be converted into electrical energy for storage to achieve the recovery of waste heat energy.

[0076] A control method for a cooling system of a hybrid engine supercharger, the control method comprising:

[0077] S1. Determine the current working state of the engine;

[0078] S2, obtaining the current engine oil temperature, supercharger oil temperature, ambient temperature and cooling water temperature;

[0079] S3. Adjusting the working state of the cooling system in real time based on the ambient temperature, the supercharger oil temperature, the engine oil temperature and the cooling water temperature.

[0080] Regarding step S1, specifically, the working state of the engine 2 includes shutdown and operation. The working state of the engine 2 is detected by the engine speed sensor. When the speed of the engine 2 is detected to be 0, the controller determines that the engine 2 is shut down. When the speed of the engine 2 is detected to be not 0, the controller determines that the engine 2 is in the running state.

[0081] The supercharger oil temperature is set to T, the supercharger oil temperature thresholds include T1, T2 and the warning temperature value T0, and the ideal minimum operating temperature of the supercharger oil temperature is T 理 , where T 理 <T1<T2<T0, the engine oil temperature is t, and the minimum ideal operating temperature of the engine oil temperature is t 理 , the threshold of the engine oil temperature is set to t0, and the ambient temperature is set to t 环 , the cooling water temperature is t 水 .

[0082] In this embodiment, the threshold value T1 of the supercharger oil temperature is set to 80°C, T2 is set to 115°C, and the warning temperature value T0 is set to 135°C;

[0083] S101: If engine 2 is stopped:

[0084] If the collected supercharger oil temperature is T, K1*T2<T≤T0, then enter S301, K1 is affected by the ambient temperature, and its value is different at different ambient temperatures. K1 is pre-calibrated according to different ambient temperatures;

[0085] S301, the external electronic water pump 8 and the external electronic oil pump 4 and the electronic fan of the engine radiator 14 are operated at maximum power until the supercharger oil temperature T≤K1*T2, K1 is a specific coefficient given at the ambient temperature, and return to S1;

[0086] Specifically, K1 is affected by the design shape of the entire water system and oil system, the length, material, size, thickness of the pipeline, the ambient temperature, and the temperature difference. The heat dissipation efficiency is different. Therefore, a floating coefficient K1 is set for the threshold of the supercharger oil temperature so that the threshold can float under different ambient temperatures. In this embodiment, a reference table of K1 is given for illustration. For the specific value of K1, please refer to Figure 2.

[0087] When the ambient temperature t 环 When the ambient temperature is above 40°C and the supercharger oil temperature T is higher than 115°C, the external electronic water pump 8, the external electronic oil pump 4 and the electronic fan will be turned on at maximum power. When the ambient temperature is -20°C and the supercharger oil temperature T is greater than K1*T2, that is, 120.75°C, the external electronic water pump 8, the external electronic oil pump 4 and the electronic fan will be turned on at maximum power. In this embodiment, the K1 table is only used as a reference to illustrate the external electronic oil pump 4, the external electronic water pump 8 and the electronic fan at different ambient temperatures when the supercharger oil temperature is in which range and they will be turned on at maximum power. The value of K1 needs to be corrected according to different actual conditions in actual applications.

[0088] If the collected temperature K1*T1<T≤K1*T2, proceed to S302;

[0089] S302, adjusting the power of the external electronic water pump 8 and the external electronic oil pump 4 in real time according to the ambient temperature and the supercharger temperature, and adjusting the real-time speed of the electronic fan in real time according to the cooling water temperature, until T≤K1*T1, or T>K1*T2, and returning to S1;

[0090] For example, when the ambient temperature is 20°C, the coefficient K1=1.02, K1*T1=1.02*80°C=81.6°C, K1*T2=1.02*115°C=117.3°C. If the supercharger oil temperature T=85°C, the controller adjusts the power of the external electronic water pump 8 and the external electronic oil pump 4, and adjusts the speed of the electronic fan according to the temperature difference between the supercharger oil temperature and the ambient temperature. The specific factors for adjusting the speed will also be affected by the size, shape, material, and other factors of each component of the oil system and the water system. Therefore, in this embodiment, a reference table is given for explanation of the speed adjustment of the electronic fan. The electronic fan speed value is as follows: Figure 5 As shown, the speed unit is r / min. For example, when the cooling water temperature is 90°C and the ambient temperature is 20°C, the speed of the electronic fan is 2000r / min.

[0091] Figure 5 The speed of the electronic fan in the table needs to be corrected according to the actual conditions of different vehicles in actual applications.

[0092] If the supercharger oil temperature T≤K1*T1, enter S303;

[0093] S303, the external electronic water pump 8 and the external electronic oil pump 4 are turned off, the electronic fan is stopped, and the process returns to S1.

[0094] For example, when the ambient temperature is 0°C, K1 is 1.04, then when T≤K1*T1, that is, 83.2°C, the external electronic water pump 8, the external electronic oil pump 4 and the electronic fan are turned off.

[0095] If the supercharger oil temperature T> the warning value T0, then enter S304;

[0096] In this embodiment, the warning value T0 is 135°C.

[0097] S304, the external electronic water pump 8, the external electronic oil pump 4 and the electronic fan operate at maximum power until T≤T0, and then return to S1.

[0098] A further technical solution is that in the steps S301 and S302, the magnitude relationship between the supercharger oil temperature T and the engine oil temperature t is determined, and the flow rate of cooling water and the flow rate of oil flowing into the supercharger 1 and the engine 2 are determined;

[0099] The real-time flow ratio of the flow Q1 of the first cooling water flow valve 10 to the flow Q2 of the second cooling water flow valve 9 is Q1:Q2=K2*(TT 理 ):(tt 理 ), the total cooling water flow is Q 水 ;

[0100] The real-time flow ratio of the flow Q3 of the first oil flow valve 15 to the flow Q4 of the second oil flow valve 16 is Q3:Q4=K2*(TT 理 ):(tt 理 ), the total oil flow is Q 油 .

[0101] Among them, K2 is pre-calibrated according to different ambient temperatures. K2 is affected by environmental factors such as the size and material of each component. In this embodiment, the following is set: Figure 3 The values ​​in the table and set T 理 =80℃,t 理 =80℃, Figure 3 In actual application, K2 in the table needs to be corrected according to different actual conditions.

[0102] For example, when the ambient temperature is 25°C, after the engine is stopped for 2 seconds, the engine oil temperature is 110°C, the turbocharger oil temperature is 115°C, and the cooling water temperature is 90°C. The flow ratio of the cooling water in the turbocharger water jacket 12 and the engine water jacket 11 is Q1:Q2=K2*(TT 理 ):(tt 理 ), when the ambient temperature is 25℃, K2=1.2, TT 理 =35℃,tt 理=30℃, then Q1:Q2=1.4:1, that is, when the flow rate distribution of the supercharger water jacket 12 and the engine water jacket 11 about the cooling water is 1.4:1, the heat dissipation and the power loss caused by the heat dissipation can be balanced at this time, and the control of the flow rate ratio of the cooling water of the supercharger water jacket 12 and the engine water jacket 11 is achieved by the controller controlling the first cooling water flow valve 10 and the second cooling water flow valve 9;

[0103] The oil flow distribution is also Q3:Q4=K2*(TT 理 ):(tt 理 )=1.4:1.

[0104] In the step S302, Q 水 and Q 油 The ratio is adjusted in real time according to the ambient temperature, and the ratio is: Q 水 :Q 油 =K3:1, where K3 is pre-calibrated according to different ambient temperatures, Q 水 =α*(Tt 环 )*Q 常 , α is pre-calibrated according to the cooling system conditions of different vehicles, Q 常 To pre-calibrate the value, Q 常 Affected by factors such as the size of the supercharger and the engine, the specific value depends on the actual vehicle situation. K3 is affected by environmental factors and the size and material of each component. In this embodiment, the following is set: Figure 4 The values ​​in the table, Figure 4 In practical applications, K3 in the table needs to be modified according to different actual conditions. The value of α is affected by the cooling system itself. In this embodiment, α can be set to 0.012, and a Q is given. 常 The value of Q 常 =80L / min.

[0105] For example, the cooling water flow Q of the water system 水 and the oil flow rate Q in the oil system 油 The proportional relationship Q 水 :Q 油 =K3:1, when the ambient temperature is 30℃, K3=9, that is, Q 水 :Q 油 =9:1, when the engine 2 is stopped, when the cooling water flow is 9, the oil flow is 1, which can balance the heat dissipation and power loss caused by the water system and the oil system. The specific method of controlling the total flow ratio of cooling water and oil is to adjust the power of the external electronic water pump 8 and the power of the external electronic oil pump 4 through the controller to achieve the change of this flow ratio.

[0106] Specifically, when the engine is stopped, the total cooling water flow Q 水 and total oil flow Q 油 The regulation is adjusted by changing the power of the external electronic water pump 8 and the external electronic oil pump 4. For example, when the ambient temperature is 30°C, T=100, Q 水 =0.012*(100-30)*80=67.2L / min, after rounding, Q 油 =7.47L / min.

[0107] In the step S304, the first cooling water flow valve 10, the second cooling water flow valve 9, the first engine oil flow valve 15 and the second engine oil flow valve 16 are all opened to the maximum. Because the temperature of the supercharger oil has exceeded the warning value, there is no need to consider the problem of balancing heat dissipation and energy consumption at this time. It is only necessary to dissipate heat as quickly as possible to protect the supercharger.

[0108] S102: If the engine 2 is running, the engine oil pump 3 and the engine water pump 7 are working:

[0109] The following steps are all performed when the engine 2 is running:

[0110] When T≤K1*T1, enter S305;

[0111] S305, the controller controls the external electronic water pump 8, the external electronic oil pump 4 and the electronic fan to stop until T>K1*T1, or the engine 2 stops, and returns to S1;

[0112] In this step, since the engine 2 is already running, the engine oil pump 3 and the engine water pump 7 are driven by the engine 2, and the supercharger oil temperature is less than K1*T1, there is no need to turn on the external electronic water pump 8 and the external electronic oil pump 4 and the electronic fan for heat dissipation. This state is generally the state when the engine has just started.

[0113] When K1*T1<T≤T0, enter S306;

[0114] S306, the controller controls the external electronic water pump 8 and the external electronic oil pump 4 to not work, and the electronic fan adjusts the speed in real time according to the ambient temperature and the cooling water temperature. The speed adjustment reference Figure 5 Tachometer, until T>T0, or T≤K1*T1, or engine 2 stops, return to S1;

[0115] This step is also performed when the engine 2 is in operation. Because the engine 2 is already running, the engine oil pump 3 and the engine water pump 7 have been driven to work by the engine. Therefore, the faster the engine speed is, the faster the speed of the engine water pump 7 and the engine oil pump 3 is. Moreover, the temperature of the supercharger 1 is within a reasonable range and does not exceed the warning value. It is only necessary for the engine oil pump 3 and the engine water pump 7 to dissipate heat by themselves, and the speed can be adjusted by the electronic fan at different ambient temperatures to meet the heat dissipation requirements.

[0116] If T>T0, the electronic fan runs at maximum power, and the controller reminds the driver to stop the car and open the engine cover to check until T≤T0, and then returns to S1.

[0117] This step is generally performed when the engine 2 and the supercharger 1 work for an extended period of time, or encounter other special circumstances, such as lack of cooling water, or damage to certain components, and a stop inspection is required.

[0118] If the engine 2 is running, the first oil flow valve 15 and the second oil flow valve 16 are both opened to the maximum, the first cooling water flow valve 10 and the second cooling water flow valve 9 are opened to the maximum, and the engine oil pump 3 and the engine water pump 7 are driven to jointly dissipate heat in the water circuit and the oil circuit.

[0119] If T>T1, the controller controls the heat storage and release assembly 13 to store heat and convert thermal energy into electrical energy.

[0120] If the engine 2 is running and the engine oil temperature is less than the threshold value t0 of the engine oil temperature, in the present embodiment, t0 is set to 55°C. When the engine oil temperature is less than 55°C, the controller controls the heat storage and release component 13 to release heat, converting electrical energy into thermal energy to heat the engine oil. This step is generally used for the cold start of the engine 2 to heat the oil and warm up the engine to ensure that all components are adequately lubricated.

[0121] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology in this field to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A control method for a cooling system of a hybrid engine supercharger, wherein the cooling system of the hybrid engine supercharger comprises a water system, an oil system, a temperature acquisition system, a controller and an engine speed sensor; The water system includes an engine water pump, an engine water jacket, a supercharger water jacket, an engine radiator and an external electronic water pump forming a closed loop; The oil system includes an engine oil pump, an engine, a supercharger, an engine oil sump, an oil cooler and an external electronic oil pump forming a closed loop; in, The temperature acquisition system is used to collect the water temperature of the water system, the oil temperature of the oil system and the ambient temperature, and is connected to the controller by electrical signals; The engine water pump is connected in parallel with the external electronic water pump in the water system, and the engine water jacket and the supercharger water jacket are connected in parallel in the water system; the water outlets of the engine water pump and the external electronic water pump are connected to the water inlets of the engine water jacket and the supercharger water jacket, the engine oil pump is connected in parallel with the external electronic oil pump in the oil system, the engine and the supercharger are connected in parallel in the oil system, and the oil outlets of the engine oil pump and the external electronic oil pump are connected to the oil inlets of the engine and the supercharger; A first cooling water flow valve and a second cooling water flow valve capable of adjusting the flow of cooling water are respectively installed on the water inlets of the supercharger water jacket and the engine water jacket; A first oil flow valve and a second oil flow valve capable of adjusting the oil flow are installed on the oil inlet of the engine and the supercharger; The engine radiator includes cooling fins and an electronic fan, and an oil cooler and a heat storage and release component are arranged between the engine oil pan and the engine oil pump; Characterized in that the control method of the cooling system of the hybrid engine supercharger includes: S1. Determine the current working state of the engine; S2, obtaining the current engine oil temperature, supercharger oil temperature, ambient temperature and cooling water temperature; S3, adjusting the working state of the cooling system in real time based on the ambient temperature, the supercharger oil temperature, the engine oil temperature and the cooling water temperature; The working state of the engine includes shutdown and operation, the supercharger oil temperature is T, the threshold value of the supercharger oil temperature includes T1, T2 and the warning temperature value T0, and the minimum ideal working temperature of the supercharger oil temperature is T 理 , where T 理 <T1<T2<T0, the engine oil temperature is t, and the minimum ideal operating temperature of the engine oil temperature is t 理 , the threshold of the engine oil temperature is set to t0, and the ambient temperature is set to t 环 , the cooling water temperature is t 水 ; S101. If the engine stops: If K1*T2<T≤T0, then enter S301, K1 is pre-calibrated according to different ambient temperatures; S301, the external electronic water pump, the external electronic oil pump and the electronic fan operate at maximum power until T≤K1*T2, and then return to S1; If K1*T1<T≤K1*T2, then go to S302; S302, adjusting the power of the external electronic water pump and the external electronic oil pump in real time according to the ambient temperature and the supercharger oil temperature, and adjusting the real-time speed of the electronic fan in real time according to the cooling water temperature, until T≤K1*T1, or T>K1*T2, and returning to S1; If T≤K1*T1, go to S303; S303, the external electronic water pump and the external electronic oil pump are turned off, the electronic fan is stopped, and the process returns to S1; If T>T0, then go to S304; S304: The external electronic water pump, the external electronic oil pump and the electronic fan operate at full power until T≤T0, and then return to S1.

2. The control method for a cooling system of a hybrid engine supercharger according to claim 1, characterized in that: In the steps S301 and S302, the magnitude relationship between T and t is determined, and the flow rates of cooling water and engine oil flowing into the supercharger water jacket and the engine water jacket are determined; The real-time flow ratio of the flow rate Q1 of the first cooling water flow valve to the flow rate Q2 of the second cooling water flow valve is Q1:Q2=K2*(TT 理 ):(tt 理 ), the total cooling water flow is Q 水 , K2 is pre-calibrated according to different ambient temperatures; The real-time flow ratio of the flow Q3 of the first oil flow valve to the flow Q4 of the second oil flow valve is Q3:Q4=K2*(TT 理 ):(tt 理 ), the total oil flow is Q 油 ; In the step S302, Q 水 and Q 油 The ratio is adjusted in real time according to the ambient temperature, and its ratio is Q 水 :Q 油 =K3:1, K3 is pre-calibrated according to different ambient temperatures, where: Q 水 =α*(T-t 环 )*Q 常 ; The value of α is pre-calibrated according to the cooling system itself, Q 常 is a pre-calibrated value; In the step S304, the first cooling water flow valve, the second cooling water flow valve, the first engine oil flow valve, and the second engine oil flow valve are all opened to the maximum.

3. The control method of a cooling system of a hybrid engine supercharger according to claim 2, characterized in that: S102: If the engine is running, the engine oil pump and the engine water pump are working: When T≤K1*T1, enter S305; S305, the controller controls the external electronic water pump, the external electronic oil pump and the electronic fan to stop until T>K1*T1, or the engine stops, and returns to S1; When K1*T1<T≤T0, enter S306; S306, the controller controls the external electronic water pump and the external electronic oil pump to not work, and the electronic fan adjusts the speed in real time according to the ambient temperature and the cooling water temperature until T>T0, or T≤K1*T1, or the engine stops, and returns to S1; If T>T0, the electronic fan runs at full power, and the controller reminds the driver to stop the vehicle, idle and open the engine cover until T≤T0, and then returns to S1.

4. The control method for a cooling system of a hybrid engine supercharger according to claim 3, characterized in that: If the engine is running, the first oil flow valve and the second oil flow valve are both opened to the maximum, and the first cooling water flow valve and the second cooling water flow valve are both opened to the maximum.

5. A control method for a cooling system of a hybrid engine supercharger according to any one of claims 1 or 3, characterized in that: If T>T1, the controller controls the heat storage and release assembly to store heat and convert thermal energy into electrical energy.

6. The control method for a cooling system of a hybrid engine supercharger according to claim 3, characterized in that: If the engine is running and the engine oil temperature is less than t0, the controller controls the heat storage and release component to release heat to convert electrical energy into thermal energy.

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