Cooling control method for hybrid electric vehicle, controller and vehicle

Abstract

The invention relates to the technical field of hybrid power automobile cooling control, in particular to a hybrid power automobile cooling control method, a controller and a vehicle. The method comprises the following steps that S1, according to a first control method, after an engine runs at a high speed to generate power, the water temperature of the engine rises, and when the state of charge of a battery meets the whole vehicle working requirement, the engine stops and stops generating power; the water temperature is still gradually increased due to the hot dipping effect, and at the moment, an electronic water pump and an electronic fan for cooling circulation are started for cooling; s2, the electronic water pump and the electronic fan are not started, and the engine is restarted to cool the automobile; and S3, when the water temperature is reduced, comparing the power consumption of the engine fan with the power consumption of the electronic fan. When the water temperature rises due to the hot dipping effect after the engine runs at a high speed, generates electricity and stops, the electronic water pump and the electronic fan for cooling circulation are started in time for cooling, the situation that due to the hot dipping effect, the water temperature rises continuously, and high-temperature alarm abnormity occurs can be effectively avoided, and the safety of the engine after stopping is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hybrid vehicle cooling control, in particular to a hybrid vehicle cooling control method, controller and vehicle. BACKGROUND

[0002] The current engine cooling control strategy of the hybrid vehicle is to control according to the engine water temperature, air conditioning state and other factors. The engine of the hybrid vehicle mainly works when there is a power generation demand, and the working condition is simple. In the first case, the engine water temperature of the hybrid vehicle continues to rise when the engine generates power continuously, and the state of charge of the battery meets the demand. After the engine stops generating power, the water temperature will continue to rise due to the heat soaking effect of the engine. If sufficient cooling is not performed, high temperature alarm abnormality will occur. In the second case, after the engine of the hybrid vehicle stops generating power for a period of time and restarts high-speed power generation, the engine water temperature rises rapidly and exceeds the maximum allowable water temperature of the engine due to the fact that the clutch type fan cannot act in time, resulting in high temperature alarm abnormality.

[0003] Therefore, we improve it and propose a hybrid vehicle cooling control method, controller and vehicle. SUMMARY

[0004] The purpose of the present application is to solve the problem that the engine of the hybrid vehicle generates power, the heat soaking effect and the fan response lag, the cooling is insufficient, and the water temperature exceeds the limit and causes high temperature alarm abnormality.

[0005] In order to achieve the above-mentioned purpose of the application, the present application provides a hybrid vehicle cooling control method, controller and vehicle to improve the above-mentioned problems.

[0006] The present application is as follows:

[0007] A hybrid vehicle cooling control method, comprising the following steps:

[0008] S1, control method one: when the engine water temperature rises after the engine runs at high speed to generate power, and the state of charge of the battery meets the working needs of the vehicle, the engine is stopped and power generation is stopped. Due to the heat soaking effect, the water temperature will still gradually rise. At this time, start the cooling circulation of the electronic water pump and the electronic fan to cool;

[0009] S2, do not start the electronic water pump and the electronic fan, and restart the engine to cool the vehicle;

[0010] S3, when the water temperature decreases, compare the engine fan power consumption and the electronic fan power consumption, the engine water pump power consumption and the electronic water pump power consumption, close the high power consumption part, and retain the low power consumption part to cool, until the engine water temperature decreases to below the safe temperature, and then close the low power consumption part;

[0011] S4, control method two: for hybrid vehicle engine stop generating electricity, when the engine needs to generate electricity again, the engine speed is raised according to the set rule.

[0012] As a preferred technical solution of the present application, the engine fan is a clutch type fan.

[0013] As a preferred technical solution of the present application, the engine water pump is a clutch type water pump.

[0014] As a preferred technical solution of the present application, when the water temperature is reduced, when the engine fan power consumption is greater than or equal to the electronic fan power consumption, the engine fan is turned off, and the electronic fan is used for continuous cooling, when the engine fan power consumption is less than the electronic fan power consumption, the electronic fan is turned off, and the engine fan is used for continuous cooling.

[0015] As a preferred technical solution of the present application, when the engine water pump power consumption is greater than or equal to the electronic water pump power consumption, the engine water pump is turned off, and the electronic water pump is used for continuous cooling, when the engine water pump power consumption is less than the electronic water pump power consumption, the electronic water pump is turned off, and the engine water pump is used for continuous cooling.

[0016] As a preferred technical solution of the present application, the engine speed setting rule is step type, gradually raised at fixed interval time.

[0017] As a preferred technical solution of the present application, the safety temperature is the highest average water temperature under normal working condition of the vehicle.

[0018] A kind of hybrid vehicle cooling controller, the controller includes the memory that control method one and control method two are stored.

[0019] A kind of hybrid vehicle cooling vehicle, the vehicle is hybrid vehicle, and equipped with controller, uses control method one and control method two to adjust and control engine cooling mode.

[0020] Compared with the prior art, the beneficial effects of the present application are:

[0021] In the scheme of the present application:

[0022] 1. In order to solve the problem that the engine of the hybrid vehicle generates electricity, the heat soaking effect and the fan response lag, resulting in insufficient cooling, water temperature exceeding limit and high temperature alarm abnormality, when the engine is running at high speed and generating electricity, the electronic water pump and the electronic fan are started in time to cool when the water temperature rises due to heat soaking effect, which can effectively avoid the high temperature alarm abnormality caused by continuous rising of water temperature due to heat soaking effect, and ensure the safety of the engine after shutdown. Through restarting the engine for cooling and subsequent selection of multiple cooling modes according to power consumption, the cooling strategy can be flexibly adjusted according to different working conditions, the cooling efficiency is improved, the energy consumption is reduced, and the engine water temperature is always kept within a reasonable range.

[0023] 2. When the engine of the application stops generating electricity and generates electricity again, the rotating speed is increased according to the set rule, which helps to prepare for cooling in advance, avoids the rapid rise of water temperature exceeding the maximum allowable water temperature due to the failure of the clutch type fan to act in time, and prevents high temperature alarm abnormalities. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The principle flow chart of the hybrid vehicle cooling control method provided by the application is shown. DETAILED DESCRIPTION

[0025] In order to make the person skilled in the art better understand the application scheme, the technical solutions in the embodiments of the application will be described clearly and completely in combination with the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, not all. Based on the embodiments in the application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the application.

[0026] As described in the background, when the engine of the hybrid vehicle generates electricity, the heat soaking effect and the fan response lag, resulting in insufficient cooling, water temperature overrun and high temperature alarm abnormalities.

[0027] In order to solve this technical problem, the application provides a hybrid vehicle cooling control method, controller and vehicle, which is applied to the cooling control technical field of hybrid vehicle.

[0028] Specifically, please refer to Figure 1 A hybrid vehicle cooling control method, comprising the following steps:

[0029] S1, control method one: when the engine water temperature rises after the engine runs at high speed to generate electricity, the battery state of charge meets the vehicle working needs, the engine stops and stops generating electricity, and the water temperature will still gradually rise due to the heat soaking effect. At this time, start the cooling cycle of the electronic water pump and the electronic fan to cool down;

[0030] S2, do not start the electronic water pump and the electronic fan, restart the engine to cool the vehicle;

[0031] S3, when the water temperature decreases, compare the engine fan power consumption and the electronic fan power consumption, the engine water pump power consumption and the electronic water pump power consumption, close the high power consumption parts, and keep the low power consumption parts to cool down, until the engine water temperature decreases to below the safe temperature, and close the low power consumption parts;

[0032] S4, control method two: for the hybrid vehicle engine to stop generating electricity, when the engine needs to generate electricity again, the rotating speed of the engine is increased according to the set rule.

[0033] This application promptly starts the electronic water pump and electronic fan of the cooling cycle for cooling when the water temperature rises due to the heat soak effect after the engine is shut down during high-speed operation. This can effectively avoid the high-temperature alarm abnormality caused by the continuous rise in water temperature due to the heat soak effect, thereby ensuring the safety of the engine after shutdown. By restarting the engine for cooling and subsequently selecting a variety of cooling methods for cooling parts based on power consumption, the cooling strategy can be flexibly adjusted according to different working conditions, thereby improving cooling efficiency, reducing energy consumption, and ensuring that the engine water temperature is always within a reasonable range.

[0034] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0035] Example 1, please refer to Figure 1 , a hybrid vehicle cooling control method, comprising the following steps:

[0036] S1. Control method 1: After the engine runs at high speed to generate electricity, the engine water temperature rises. When the battery state of charge meets the vehicle's operating requirements, the engine stops and stops generating electricity. Due to the heat soak effect, the water temperature will continue to rise gradually. At this time, the electronic water pump and electronic fan of the cooling cycle are started for cooling.

[0037] S2: Do not start the electronic water pump and electronic fan, and restart the engine to cool the car;

[0038] S3. When the water temperature drops, compare the power consumption of the engine fan and the electronic fan, the power consumption of the engine water pump and the power consumption of the electronic water pump, turn off the high-power consumption components, and keep the low-power consumption components for cooling until the engine water temperature drops below the safe temperature, and then turn off the low-power consumption components; when the power consumption of the engine fan ≥ the power consumption of the electronic fan, turn off the engine fan and continue cooling with the electronic fan; when the power consumption of the engine fan < the power consumption of the electronic fan, turn off the electronic fan and continue cooling with the engine fan; when the power consumption of the engine water pump ≥ the power consumption of the electronic water pump, turn off the engine water pump and continue cooling with the electronic water pump; when the power consumption of the engine water pump < the power consumption of the electronic water pump, turn off the electronic water pump and continue cooling with the engine water pump until the engine water temperature drops below the safe temperature, and then turn off the low-power consumption components to ensure that the engine does not have a high-temperature alarm abnormality.

[0039] The power consumption of the engine fan is 1.6Kw at 2000rpm, and the power consumption of the electronic fan is 1.3Kw at 2000rpm; the power consumption of the engine fan is 0.4Kw at 1000rpm, and the power consumption of the electronic fan is 0.56Kw at 1000rpm; the power consumption of the engine water pump is 1.2Kw at 200L / min, and the power consumption of the electronic water pump is 0.9Kw at 200L / min; the power consumption of the engine water pump is 0.5Kw at 100L / min, and the power consumption of the electronic water pump is 0.6Kw at 100L / min. The safety temperature is 92°C.

[0040] After the engine of the hybrid vehicle stops generating electricity, the engine water temperature continues to rise. The electronic water pump, electronic fan, or the engine is restarted for cooling. When the engine water temperature decreases, the engine fan power consumption is 1.6Kw at 2000rpm, and the electronic fan power consumption is 1.3Kw at 2000rpm. Therefore, the engine fan is turned off, and the electronic fan is used for cooling. When the engine water temperature decreases, the engine fan power consumption is 0.4Kw at 1000rpm, and the electronic fan power consumption is 0.56Kw at 1000rpm. Therefore, the electronic fan is turned off, and the engine fan is used for cooling. Similarly, when the engine water temperature decreases, the engine water pump flow is 200L / min, and the power consumption is 1.2Kw. The electronic water pump flow is 200L / min, and the power consumption is 0.9Kw. Therefore, the engine water pump is turned off, and the electronic water pump is used for cooling. When the engine water temperature decreases, the engine water pump flow is 100L / min, and the power consumption is 0.5Kw. The electronic water pump flow is 100L / min, and the power consumption is 0.6Kw. Therefore, the electronic water pump is turned off, and the engine water pump is used for cooling. This process continues until the engine water temperature decreases to 92℃, the safe temperature.

[0041] S4, Control method two: after the engine of the hybrid vehicle stops generating electricity, when the engine is needed to generate electricity again, the controller calls the engine speed to increase according to the set rule, wherein the set rule is that the engine speed gradually increases by n2 every interval time t in a step-by-step manner, that is, the engine speed increases by n2 every interval time t, until the target engine generating speed n3 is reached, rather than directly increasing the engine speed from zero to the target generating speed, to prevent the clutch fan from not working in time and causing high temperature alarm abnormalities.

[0042] In the above, the interval time t is 2s, the engine speed increases by n2 of 300rpm, and the target generating speed n3 is 1200rpm.

[0043] When the hybrid vehicle needs to generate electricity again, the engine starts and the speed increases by 300rpm every 2s, until the engine speed increases to the target generating speed of 1200rpm.

[0044] The engine fan is a clutch fan. By reasonably controlling the start and stop and speed of the clutch fan, and combining the cooperative work of other cooling components, the cooling advantage of the clutch fan can be fully utilized, and the disadvantage of response lag can be overcome. When the engine needs to be quickly cooled, the fan is prepared in advance to ensure that it can work in time and effectively reduce the engine water temperature, avoiding insufficient cooling due to fan problems and improving the reliability and stability of the entire cooling system.

[0045] The engine water pump is a clutch type water pump. The clutch type water pump can flexibly control the flow and speed of water circulation according to the actual working requirements of the engine. When the engine is running at low load, the speed of the water pump can be reduced to reduce energy consumption. When the engine is running at high load or needs to be quickly cooled, the speed of the water pump can be increased to enhance the cooling effect. Compared with the traditional mechanical water pump, the adjustability of the cooling system can more accurately match the heat dissipation requirements of the engine, avoiding unnecessary energy waste. Combined with the cooling control method, the appropriate water pump operation mode can be selected according to different working conditions to further improve the cooling efficiency, reduce the engine water temperature, reduce the failure caused by high water temperature, and improve the overall performance and economy of the vehicle.

[0046] The engine speed setting rule is stepwise, and the speed is gradually increased at fixed interval time. The stepwise speed increasing mode can make the engine speed transition smoothly, avoiding the impact of sudden speed change on the engine and the cooling system. Sudden speed change may cause uneven stress on engine internal parts, increasing the risk of wear and failure. The stepwise increase can effectively alleviate the impact and protect the normal operation of the engine. Gradually increasing the speed at fixed interval time allows the cooling system enough time to adapt to the change of engine speed, gradually adjusting the circulation speed and heat dissipation capacity of the coolant. This can ensure that the cooling system can keep up with the heat dissipation demand during the process of increasing the engine speed, avoiding large fluctuations in water temperature, improving the stability and reliability of the cooling system, and providing continuous and stable cooling protection for the engine.

[0047] The safety temperature is the highest average water temperature under normal working conditions of the vehicle. When the vehicle runs under different working conditions, the water temperature of the engine will fluctuate. The highest average water temperature under normal working conditions can reflect the temperature level of the engine under most normal operating conditions. Using this temperature as a reference standard for safety temperature can more accurately determine whether the engine water temperature is within the safety range. When the water temperature approaches or exceeds the set value, the corresponding cooling measures are started in time, which can effectively prevent the engine from being damaged due to high water temperature, avoid the frequent start of the cooling system due to low set temperature, increase the energy consumption and part wear, and prevent the set temperature from being too high to protect the engine in time. This improves the intelligent level and operation efficiency of the cooling system.

[0048] Embodiment 2, a hybrid vehicle cooling controller, the controller includes a memory storing control method one and control method two, the controller can accurately determine the working state and cooling demand of the engine according to the real-time collected engine water temperature, speed, load parameters, and accurately control the cooling system, when detecting that the engine water temperature rises due to thermal immersion effect, the controller can start the electronic water pump and electronic fan for cooling in time, when the engine restarts high speed power generation, adjust the engine speed, this intelligent control method improves the accuracy and timeliness of cooling control, avoids the error and delay of manual operation, improves the performance and reliability of the whole cooling system, and provides strong guarantee for the safe operation of the hybrid vehicle engine.

[0049] Embodiment 3, a hybrid vehicle cooling vehicle, the vehicle is a hybrid vehicle, and is equipped with a controller, and uses control method one and control method two to adjust and control the engine cooling mode.

[0050] Control method one and control method two can fully exert the advantages of the controller and the cooling control method, so that the cooling system and the working state of the engine are more matched, the vehicle can ensure that the engine always operates in the appropriate temperature range according to different road conditions, driving habits and engine working conditions, which not only improves the performance and reliability of the engine, reduces the probability of failure, but also reduces the maintenance cost and use cost of the vehicle, and enhances the market competitiveness of the vehicle.

[0051] Obviously, the above described embodiments are only part of the embodiments of the present application, not all the embodiments, the preferred embodiments of the present application are given in the drawings, but do not limit the patent scope of the present application. The present application can be realized in many different forms, on the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features. Any equivalent structure made by using the content of the present application specification and drawings, directly or indirectly applied in other related technical fields, is also within the patent protection scope of the present application.

Claims

1. A hybrid vehicle cooling control method, characterized in that: The following steps are involved: S1. Control method 1: After the engine runs at high speed to generate electricity, the engine water temperature rises. When the battery state of charge meets the vehicle's operating requirements, the engine stops and stops generating electricity. Due to the heat soak effect, the water temperature will continue to rise gradually. At this time, the electronic water pump and electronic fan of the cooling cycle are started for cooling. S2: Do not start the electronic water pump and electronic fan, and restart the engine to cool the car; S3. When the water temperature drops, compare the power consumption of the engine fan and the electronic fan, and the power consumption of the engine water pump and the electronic water pump, turn off the high-power consumption components, and keep the low-power consumption components for cooling until the engine water temperature drops below a safe temperature, and then turn off the low-power consumption components; S4. Control method 2: After the hybrid vehicle engine stops generating electricity, when the engine is needed to generate electricity again, the engine speed increases according to a set rule.

2. A hybrid vehicle cooling control method according to claim 1, characterized in that: The engine fan is a clutch type fan.

3. The hybrid vehicle cooling control method according to claim 1, characterized in that: The engine water pump is a clutch type water pump.

4. The hybrid vehicle cooling control method according to claim 1, characterized in that: When the water temperature drops, if the engine fan power consumption is greater than or equal to the electronic fan power consumption, the engine fan is turned off and the electronic fan is used to continue cooling. If the engine fan power consumption is less than the electronic fan power consumption, the electronic fan is turned off and the engine fan is used to continue cooling.

5. The hybrid vehicle cooling control method according to claim 1, characterized in that: When the engine water pump power consumption is greater than or equal to the electronic water pump power consumption, the engine water pump is turned off and the electronic water pump is used to continue cooling. When the engine water pump power consumption is less than the electronic water pump power consumption, the electronic water pump is turned off and the engine water pump is used to continue cooling.

6. The hybrid vehicle cooling control method according to claim 1, characterized in that: The engine speed setting rule is step-by-step, gradually increasing at fixed intervals.

7. The hybrid vehicle cooling control method according to claim 1, characterized in that: The safe temperature is the highest average water temperature under normal vehicle operating conditions.

8. A hybrid vehicle cooling controller according to any one of claims 1 to 7, characterized in that: The controller includes a memory storing a first control method and a second control method.

9. A hybrid vehicle cooling system according to any one of claims 1 to 8, characterized in that: The vehicle is a hybrid vehicle and is equipped with a controller, which uses control method 1 and control method 2 to adjust and control the engine cooling method.

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