CN113847136B - Control method of engine cooling system, vehicle and computer storage medium - Google Patents

Abstract

The invention discloses a control method of an engine cooling system, a vehicle and a computer storage medium. The method includes: when the engine is in a warm-up state, controlling the periodic operation of a water pump of the engine cooling system; The water temperature of the engine cooling system during operation; according to the water temperature, it is detected whether the engine exits the warm-up condition; when the engine exits the warm-up condition is detected, the water pump is controlled to run according to the target speed corresponding to the water temperature. The invention operates the water pump periodically when the engine is warming up to make the water temperature distribution of the cooling system more uniform, which is more accurate than the water temperature detected when the water pump is stopped, thereby improving the cooling effect of the engine cooling system.

Description

Control method of engine cooling system, vehicle and computer storage medium

technical field

The invention relates to the technical field of engines, in particular to a control method of an engine cooling system, a vehicle and a computer storage medium.

Background technique

The role of the engine cooling system is to dissipate part of the heat absorbed by the heated parts in time to ensure that the engine works at the most suitable temperature state. The cooling system of the engine is forced circulation water cooling, that is, the water pump increases the pressure of the coolant, and the coolant is forced to circulate in the engine.

In the engine cooling system, the speed of the water pump is generally controlled according to the water temperature. When the water temperature is low, the pump speed is also low, or even stop running. When the water pump stops running, the temperature value collected by the temperature sensor is subject to the influence of the installation position, which cannot correctly reflect the water temperature distribution of the entire engine, and the water temperature detection is not accurate. If the detected water temperature is too low, the water flow will be too small, and the engine is prone to hot spots and damage. If the detected water temperature is too high, the water flow rate will be too high, which will increase the power consumption of the cooling system.

The above content is only used to assist in understanding the technical solution of the present invention, and does not mean that the above content is admitted as prior art.

Contents of the invention

The main purpose of the present invention is to provide a control method of an engine cooling system, a vehicle and a computer storage medium, aiming at making the water temperature detection more accurate by periodically running the water pump.

In order to achieve the above object, the present invention provides a control method of the engine cooling system, the control method of the engine cooling system includes the following steps:

When the engine is in a warm state, the water pump controlling the engine cooling system runs periodically;

When the water pump is running periodically, obtain the water temperature of the engine cooling system when the water pump is running;

Detect whether the engine exits the warm-up condition according to the water temperature;

When it is detected that the engine exits the warm-up condition, the water pump is controlled to run according to the target speed corresponding to the water temperature.

Optionally, the step of detecting whether the engine exits the warm-up condition according to the water temperature includes:

When the water temperature is greater than the preset temperature, it is determined that the engine exits the warm-up condition;

When the water temperature is less than or equal to the preset temperature, it is determined that the engine has not exited the warm-up condition.

Optionally, when the water pump is running periodically, the step of obtaining the water temperature of the engine cooling system when the water pump is running includes:

When the water pump is running periodically, obtain the average water temperature of the engine cooling system in a single running cycle of the water pump;

Use the average water temperature as the water temperature of the engine cooling system.

Optionally, the control method of the engine cooling system further includes:

When the engine starts, obtain the initial water temperature of the engine cooling system;

When the initial water temperature is less than or equal to the preset temperature, it is determined that the engine is in a warm-up condition.

Optionally, after the step of detecting whether the engine exits the warm-up condition according to the water temperature, it further includes:

When it is detected that the engine has not exited the warm-up condition, obtain the water flow corresponding to the water temperature;

When the water flow rate is less than or equal to the preset flow rate, return to the step of controlling the periodic operation of the water pump of the engine cooling system;

When the water flow rate is greater than the preset flow rate, the water pump of the engine cooling system is controlled to run periodically according to the target speed corresponding to the water temperature, and returns to the step of obtaining the water temperature of the engine cooling system when the water pump is running when the water pump runs periodically.

Optionally, when the engine is in a warm-up condition, the step of controlling the periodic operation of the water pump of the engine cooling system includes:

When the engine is in a warm-up condition, detect whether there is a heat exchange requirement in each module of the vehicle, where the modules of the vehicle include the passenger compartment, engine and exhaust gas recirculation system;

There is no need for heat exchange in each module of the vehicle, and the water pump that controls the engine cooling system operates periodically.

Optionally, after the step of detecting whether there is a demand for heat exchange in each module of the vehicle when the engine is in a warm-up condition, the method further includes:

When at least one module of the vehicle has a demand for heat exchange, adjust the three-way valve of the cooling pipeline where the water pump is located so that the cooling pipeline where the water pump is located communicates with the module that requires heat exchange to form a cooling circuit;

The water pump is controlled to operate at a target speed corresponding to the water temperature of the engine cooling system.

Optionally, the step of detecting whether each module of the vehicle has a heat exchange requirement includes at least one of the following:

Detect whether the heating request of the passenger compartment is triggered to determine whether there is a heat exchange demand in the passenger compartment;

Detect whether the minimum water flow request of the engine cooling system is triggered to determine whether the engine has heat exchange requirements;

Detect whether the cooling requirement of the exhaust gas recirculation system is triggered, so as to determine whether there is a heat exchange requirement in the exhaust gas recirculation system.

In addition, in order to achieve the above object, the present invention also provides a vehicle, the vehicle includes: a memory, a processor, and a control program of the engine cooling system stored in the memory and operable on the processor, the When the control program of the engine cooling system is executed by the processor, the steps of the control method of the engine cooling system described in any one of the above are realized.

In addition, in order to achieve the above object, the present invention also provides a computer storage medium, on which a control program of the engine cooling system is stored, and when the control program of the engine cooling system is executed by a processor, the above-mentioned The steps of any one of the control methods of the engine cooling system.

The control method, vehicle, and computer storage medium of the engine cooling system proposed in the embodiments of the present invention control the periodic operation of the water pump of the engine cooling system when the engine is in a warm-up condition; The water temperature of the cooling system; according to the water temperature, it is detected whether the engine exits the warm-up condition; when it is detected that the engine exits the warm-up condition, the water pump is controlled to run according to the target speed corresponding to the water temperature. The invention operates the water pump periodically when the engine is warming up to make the water temperature distribution of the cooling system more uniform, which is more accurate than the water temperature detected when the water pump is stopped, thereby improving the cooling effect of the engine cooling system.

Description of drawings

Fig. 1 is a schematic diagram of the terminal structure of the hardware operating environment involved in the solution of the embodiment of the present invention;

Fig. 2 is a schematic flow chart of an embodiment of the control method of the engine cooling system of the present invention;

Fig. 3 is the voltage schematic diagram of periodic control water pump of the present invention;

4 is a schematic flowchart of another embodiment of the control method of the engine cooling system of the present invention;

Fig. 5 is a schematic flowchart of another embodiment of the control method of the engine cooling system of the present invention;

Fig. 6 is the first schematic diagram of the cooling circuit of the engine cooling system of the present invention;

7 is a second schematic diagram of the cooling circuit of the engine cooling system of the present invention;

8 is a third schematic diagram of the cooling circuit of the engine cooling system of the present invention;

9 is a fourth schematic diagram of the cooling circuit of the engine cooling system of the present invention;

FIG. 10 is a fifth schematic diagram of the cooling circuit of the engine cooling system of the present invention.

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The embodiment of the present invention provides a solution. When the engine is warming up, the water pump is periodically operated to make the water temperature distribution of the cooling system more uniform, which is more accurate than the water temperature detected when the water pump is stopped, thereby improving the engine cooling system. cooling effect.

As shown in FIG. 1 , FIG. 1 is a schematic diagram of a terminal structure of a hardware operating environment involved in the solution of the embodiment of the present invention.

The terminal in this embodiment of the present invention is a control device in a vehicle, for example, a vehicle controller and an electronic control unit (ECU, Electronic Control Unit) on the vehicle.

As shown in FIG. 1 , the terminal may include: a processor 1001 , such as CPU, MCU, and DSP, a network interface 1004 , a user interface 1003 , a memory 1005 , and a communication bus 1002 . Wherein, the communication bus 1002 is used to realize connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a button, and the optional user interface 1003 may also include a standard wired interface and a wireless interface. Optionally, the network interface 1004 may include a standard wired interface and a wireless interface (such as a WI-FI interface). The memory 1005 can be a high-speed RAM memory, or a stable memory (non-volatile memory), such as a disk memory. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001 .

Those skilled in the art can understand that the terminal structure shown in FIG. 1 does not constitute a limitation on the terminal, and may include more or less components than those shown in the figure, or combine some components, or arrange different components.

As shown in FIG. 1 , the memory 1005 as a computer storage medium may include a control program for operating a network communication module, a user interface module and an engine cooling system.

In the terminal shown in Figure 1, the network interface 1004 is mainly used to connect to the background server and perform data communication with the background server; the user interface 1003 is mainly used to connect to the client (client) and perform data communication with the client; and the processor 1001 can be used to call the control program of the engine cooling system stored in memory 1005, and perform the following operations:

When the engine is in a warm state, the water pump controlling the engine cooling system runs periodically;

When the water pump is running periodically, obtain the water temperature of the engine cooling system when the water pump is running;

Detect whether the engine exits the warm-up condition according to the water temperature;

When it is detected that the engine exits the warm-up condition, the water pump is controlled to run according to the target speed corresponding to the water temperature.

Further, the processor 1001 can call the control program of the engine cooling system stored in the memory 1005, and also perform the following operations:

When the water temperature is greater than the preset temperature, it is determined that the engine exits the warm-up condition;

When the water temperature is less than or equal to the preset temperature, it is determined that the engine has not exited the warm-up condition.

Further, the processor 1001 can call the control program of the engine cooling system stored in the memory 1005, and also perform the following operations:

When the water pump is running periodically, obtain the average water temperature of the engine cooling system in a single running cycle of the water pump;

Use the average water temperature as the water temperature of the engine cooling system.

Further, the processor 1001 can call the control program of the engine cooling system stored in the memory 1005, and also perform the following operations:

When the engine starts, obtain the initial water temperature of the engine cooling system;

When the initial water temperature is less than or equal to the preset temperature, it is determined that the engine is in a warm-up condition.

Further, the processor 1001 can call the control program of the engine cooling system stored in the memory 1005, and also perform the following operations:

When it is detected that the engine has not exited the warm-up condition, obtain the water flow corresponding to the water temperature;

When the water flow rate is less than or equal to the preset flow rate, return to the step of controlling the periodic operation of the water pump of the engine cooling system;

When the water flow rate is greater than the preset flow rate, the water pump of the engine cooling system is controlled to run periodically according to the target speed corresponding to the water temperature, and returns to the step of obtaining the water temperature of the engine cooling system when the water pump is running when the water pump runs periodically.

Further, the processor 1001 can call the control program of the engine cooling system stored in the memory 1005, and also perform the following operations:

When the engine is in a warm-up condition, detect whether there is a heat exchange requirement in each module of the vehicle, where the modules of the vehicle include the passenger compartment, engine and exhaust gas recirculation system;

There is no need for heat exchange in each module of the vehicle, and the water pump that controls the engine cooling system operates periodically.

Further, the processor 1001 can call the control program of the engine cooling system stored in the memory 1005, and also perform the following operations:

When at least one module of the vehicle has a demand for heat exchange, adjust the three-way valve of the cooling pipeline where the water pump is located so that the cooling pipeline where the water pump is located communicates with the module that requires heat exchange to form a cooling circuit;

The water pump is controlled to operate at a target speed corresponding to the water temperature of the engine cooling system.

Further, the processor 1001 can call the control program of the engine cooling system stored in the memory 1005, and also perform the following operations:

Detect whether the heating request of the passenger compartment is triggered to determine whether there is a heat exchange demand in the passenger compartment;

Detect whether the minimum water flow request of the engine cooling system is triggered to determine whether the engine has heat exchange requirements;

Detect whether the cooling requirement of the exhaust gas recirculation system is triggered, so as to determine whether there is a heat exchange requirement in the exhaust gas recirculation system.

Referring to Fig. 2, in one embodiment, the control method of engine cooling system comprises the following steps:

Step S10, when the engine is in a warm-up condition, the water pump of the engine cooling system is controlled to run periodically;

In this embodiment, the engine cooling system is mainly composed of a water pump, radiator, cooling fan, compensation water tank, thermostat, EGR cooler, passenger compartment radiator, cooling water jacket in the engine block and cylinder head, and ancillary devices, etc. composition. On high-voltage plug-in hybrid vehicles, a high-voltage PTC heater is added to the engine cooling circuit, which is used to heat the coolant to warm the passenger compartment at low temperatures.

Controlling the periodic operation of the water pump of the engine cooling system means controlling the water pump to be turned on and off periodically, for example, controlling the water pump to run for a second preset time at intervals of a first preset time. Through the periodic operation of the water pump, the coolant in the engine cooling system flows periodically, and the coolant in the water jacket is pre-mixed, so that the water temperature sensor can collect more accurate water temperature values, and at the same time prevent the engine block from being warmed up. Hot spots are generated under working conditions, which can also reduce the requirements for the installation position of the water temperature sensor. For example, as shown in Figure 3, by calibrating the T _off and T _on time periods, the water pump is turned on during the T _on time period, and the water pump is turned off during the T _off time period, so as to obtain accurate water temperature.

Optionally, the warm-up working condition is a working condition when the engine water temperature is lower than a preset temperature, wherein the preset temperature may be 80°C. When the engine is started, the initial water temperature of the engine cooling system is obtained, and when the initial water temperature is less than or equal to the preset temperature, it is determined that the engine enters a warm-up state, and step S10 is executed.

Step S20, when the water pump is running periodically, obtain the water temperature of the engine cooling system when the water pump is running;

In the present embodiment, the water pump operation stage is the T _on time period in Fig. 3, and the water temperature of the engine cooling system in the T _on time period is obtained. Since the coolant inside the engine cooling system is flowing at this time, the detected Water temperature is more accurate.

Optionally, when the water pump runs periodically, the average water temperature of the engine cooling system in a single operation period of the water pump is obtained, and the average water temperature is used as the water temperature of the engine cooling system, that is, all the water temperature values detected in the T _on time period are obtained, and The average value is used as the water temperature of the engine cooling system, making the detected water temperature more accurate. Wherein, the average water temperature is calculated by moving the water temperature values read by the water temperature sensor on the time series within a single T _on time period to obtain the average water temperature.

Step S30, detecting whether the engine exits the warm-up working condition according to the water temperature;

In this embodiment, after obtaining a more accurate water temperature, it can be more accurately detected whether the engine exits the warm-up state according to the water temperature. Specifically, when the water temperature is greater than the preset temperature, it is determined that the engine is out of the warm-up condition, and when the water temperature is less than or equal to the preset temperature, it is determined that the engine has not exited the warm-up condition, that is, the engine is still in the warm-up condition.

Optionally, when the engine is still in the warm-up state, the execution may return to step S10.

Step S40, when it is detected that the engine exits the warm-up state, the water pump is controlled to run according to the target speed corresponding to the water temperature.

In this embodiment, when it is detected that the engine exits the warm-up state, it indicates that the engine enters a normal working state. At this time, the water pump can be controlled to run at a target speed corresponding to the water temperature to cool and dissipate heat from the engine.

Optionally, when calculating the target speed corresponding to the water temperature, the cooling power of the engine can be calculated, and the water flow required by the engine can be calculated according to the water temperature, the preset engine target water temperature and the cooling power, and then the coolant flow can be converted into the corresponding The speed value of the water pump is the target speed. Among them, the cooling power of the engine can be determined according to the current speed of the engine. For example, in the preliminary test, the heat power transmitted to the coolant by the engine under different speed loads is actually measured, so as to obtain the correspondence between the engine speed and the heat power The thermal power corresponding to the current rotational speed of the engine is the cooling power of the engine. Among them, according to the thermodynamic formula, the heat dissipation power when the water temperature is lowered to the preset engine target water temperature can be calculated at a specific water flow rate, so that the water flow rate when the heat dissipation power matches the engine cooling power can be determined, that is, the engine required water flow.

In the technical solution disclosed in this embodiment, by periodically running the water pump when the engine is warming up, the water temperature distribution of the cooling system is more uniform, which is more accurate than the water temperature detected when the water pump is stopped, thereby improving engine cooling. The cooling effect of the system.

In another embodiment, as shown in FIG. 3, on the basis of the embodiment shown in FIG. 2 above, after step S30, further includes:

Step S50, when it is detected that the engine has not exited the warm-up mode, the water flow corresponding to the water temperature is acquired;

In this embodiment, when it is detected that the engine has not exited the warm-up state, the rotation speed of the water pump may be periodically controlled according to the detected more accurate water temperature, so as to achieve more accurate flow regulation. Specifically, the cooling power of the engine can be calculated, the water flow required by the engine can be calculated according to the water temperature, the preset engine target water temperature and the cooling power, and how to periodically control the speed of the water pump can be determined according to the water flow.

Step S60, when the water flow rate is less than or equal to the preset flow rate, return to the step of controlling the periodic operation of the water pump of the engine cooling system;

In this embodiment, when the water flow rate is less than or equal to the preset flow rate, it indicates that the water flow rate is small, and the water pump may rotate too low or stop running. Therefore, at this time, it is possible to return to the step of controlling the periodic operation of the water pump of the engine cooling system. To continue to periodically control the water pump, wherein, when the water pump is periodically controlled, the speed of the water pump during operation is generally the minimum speed of the water pump, so as to reduce energy consumption. Optionally, the preset flow rate may be zero, that is, when there is no flow demand, return to the step of controlling the periodic operation of the water pump of the engine cooling system.

Step S70, when the water flow rate is greater than the preset flow rate, control the periodic operation of the water pump of the engine cooling system according to the target speed corresponding to the water temperature, and return to the implementation of the above-mentioned method of obtaining the water temperature of the engine cooling system when the water pump is running when the water pump is periodically running A step of.

In this embodiment, when the water flow rate is greater than the preset flow rate, the water pump of the engine cooling system can be controlled to run periodically according to the target speed corresponding to the water temperature, so as to avoid hot spots in the engine block during the warm-up period and damage the engine. Optionally, the preset flow rate may be zero, that is, when there is a flow demand, the water pump of the engine cooling system is controlled to run periodically at a target speed corresponding to the water temperature.

In the technical solution disclosed in this embodiment, when it is detected that the engine has not exited the warm-up mode, the rotational speed of the water pump during periodic operation is correspondingly controlled according to the water flow corresponding to the water temperature, so as to meet the heat dissipation requirements of the engine during the warm-up phase.

In yet another embodiment, as shown in FIG. 4 , on the basis of any embodiment shown in FIG. 2 to FIG. 3 , step S10 includes:

Step S11, when the engine is in a warm-up state, detect whether there is a heat exchange requirement in each module of the vehicle, wherein the modules of the vehicle include the passenger compartment, the engine, and the exhaust gas recirculation system;

Step S12, when there is no need for heat exchange in each module of the vehicle, the water pump of the engine cooling system is controlled to run periodically.

In this embodiment, as shown in Figure 6, the overall schematic diagram of the cooling circuit when the engine cooling system can be communicated with the heat exchange pipelines of each module of the vehicle to realize the thermal management of the vehicle, Coolant Sensor in the figure represents the coolant temperature sensor, TANK Indicates cooling kettle, TC indicates turbocharger (Turbo Charge), EOC indicates engine oil cooler (Engine oil cooler), Cylinder Head indicates cylinder head, Cylinder Block indicates cylinder block, EGR indicates exhaust gas recirculation system, FSV indicates throttling Valve, HT Rad means high temperature radiator (HT Radiator), HVCH means high pressure heater. Therefore, when the engine is in a warm-up condition, it is possible to detect whether there is a need for heat exchange in each module of the vehicle. If none exist, it means that the vehicle may not have a coolant flow requirement, and the water pump may stop running, resulting in inaccurate water temperature detection. Therefore, the periodic operation of the water pump of the engine cooling system can be controlled to make the water temperature detection more accurate. The coolant flow demand sources include engine block (Engine block), engine head (Engine head), engine oil (Engine oil), low pressure waste recirculation (LP-EGR), cabin heater (Cabin Heater), high temperature heat dissipation (HTRadiator) and turbocharger (Turbo Charge). The state of the three-way valve (HTV) has two types: 1 port in and 3 ports out (1in3out) and 2 ports in and 3 ports out (2in3out), and the state of the pressure valve (Bypass) has two types: open (on) and closed (off). state, then the three-way valve and the pressure valve cooperate in a total of 4 states during the warm-up process: (1) HTV 1in3out AND Bypass off; (2) HTV 1in3out AND Bypass on; (3) HTV 2in3out AND Bypass off; (4) HTV 2in3out AND Bypass on.

Optionally, when at least one module of the vehicle has a demand for heat exchange, the three-way valve of the cooling pipeline where the water pump is located can be adjusted so that the cooling pipeline where the water pump is located communicates with the module that requires heat exchange to form a cooling circuit. And control the operation of the water pump according to the target speed corresponding to the water temperature of the engine cooling system, so as to meet the heat exchange requirements of the modules with heat exchange requirements. It should be noted that the cooling pipeline where the water pump is located is closely connected to the modules that require heat exchange, and is not connected to the modules that do not require heat exchange, so that the heat exchange effect of the cooling system is better and unnecessary energy consumption can be reduced. consumption. For example, in Figure 7, only the HVCH heating circuit is shown. At this time, the state of the three-way valve and the pressure valve is: HTV 1in3out AND Bypass off. At this time, the flow rate of the circuit should be less than 18L/min to ensure that the pressure valve will not be flushed open. When only the passenger compartment needs heat exchange, the water pump communicates with the passenger compartment heater (Cabin Heater) through a three-way valve to form a cooling circuit. As another example, Fig. 8 shows the circuit when there is HVCH heating and any of the following conditions are met: (1) the passenger compartment heater request flow is greater than 18L/min; (2) the engine requests the minimum flow, at this time the three-way valve and the pressure The state of the valve is: HTV 1in3out AND Bypass on. At this time, the flow rate of the circuit should be greater than 18L/min to ensure that the pressure valve will be flushed open. When there is heat exchange demand in the passenger compartment and the engine, the water pump passes through the three-way valve and the heater in the passenger compartment. (Cabin Heater) and the cylinder head and cylinder block (Cylinder Head and Cylinder Block) are connected to form a cooling circuit. For another example, in Figure 9, the state of the three-way valve and pressure valve is: HTV2in3out AND Bypass off, and the required flow rate is less than 18L/min; in Figure 10, the state of the three-way valve and pressure valve is: HTV 2in3out AND Bypass on, and the required flow rate is greater than 18L/min, when there is a heat exchange demand in the exhaust gas recirculation system (EGR, ExhaustGas Recirculation), if the required flow rate of the exhaust gas recirculation system is less than the flow threshold (for example, 18L/min), the Bypass pressure valve is not activated. is flushed open, the water pump communicates with the exhaust gas recirculation system (EGR) through the three-way valve to form a cooling circuit (if the flow required by the exhaust gas recirculation system is greater than the flow threshold (for example, 18L/min), the Bypass pressure valve is flushed, and the water pump The three-way valve is connected with the exhaust gas recirculation system (EGR) to form a cooling circuit. It can be seen that by adding HTV three-way valve, Bypass pressure valve, FSV throttle valve, optimizing the independent water jacket of the cylinder block and cylinder head, etc., Construct different cooling circuits to meet different cooling needs, and cooperate with the optimized control logic of the electronic water pump to optimize the cooling effect and achieve energy saving effects.

Optionally, when detecting whether there is a demand for heat exchange in each module of the vehicle, at least one of the following steps may be included: detecting whether the heating request of the passenger compartment is triggered to determine whether there is a heat exchange demand for the passenger compartment; detecting whether the engine cooling system is triggered The minimum water flow request is used to determine whether the engine has a heat exchange requirement; and whether the cooling requirement of the exhaust gas recirculation system is triggered is detected to determine whether the exhaust gas recirculation system has a heat exchange requirement.

In the technical solution disclosed in this embodiment, the energy consumption is reduced and the heat management efficiency of the vehicle is improved by optimizing the cooling circuit combination of the engine cooling system.

In addition, the embodiment of the present invention also proposes a vehicle, the vehicle includes: a memory, a processor, and a control program of the engine cooling system stored on the memory and operable on the processor, the engine cooling system When the control program is executed by the processor, the steps of the method for controlling the engine cooling system described in the above embodiments are realized.

In addition, the embodiment of the present invention also proposes a computer storage medium, the computer storage medium stores the control program of the engine cooling system, and when the control program of the engine cooling system is executed by the processor, the above-mentioned various embodiments can be realized. The steps of the control method of the engine cooling system described above.

It should be noted that, as used herein, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or system comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or system. Without further limitations, an element defined by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article or system comprising that element.

The serial numbers of the above embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodiments.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on such an understanding, the technical solution of the present invention can be embodied in the form of a software product in essence or in other words, the part that contributes to the prior art, and the computer software product is stored in a storage medium (such as ROM/RAM) as described above. , magnetic disk, optical disk), including several instructions to make a terminal device (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) execute the method described in each embodiment of the present invention.

The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process conversion made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technical fields , are all included in the scope of patent protection of the present invention in the same way.

Claims (10)

1. A control method of an engine cooling system, characterized by comprising the steps of:

when the engine is in a warm-up working condition, controlling a water pump of an engine cooling system to periodically operate;

when the water pump operates periodically, acquiring the water temperature of an engine cooling system when the water pump operates;

detecting whether the engine exits the warm-up working condition or not according to the water temperature;

when the engine is detected to exit the warm-up working condition, controlling the water pump to operate according to the target rotating speed corresponding to the water temperature;

when detecting that the engine exits the warm-up working condition, the method controls the water pump to operate according to the target rotating speed corresponding to the water temperature, and comprises the following steps:

when the condition that the engine exits the warm-up working condition is detected, determining cooling power according to the current rotating speed of the engine;

determining the required water flow of the engine according to the water temperature, the cooling power and the target water temperature of the engine, and determining the target rotating speed according to the required water flow;

controlling the water pump to operate according to the target rotating speed;

when the water pump is operated periodically, the water temperature of the engine cooling system when the water pump is operated is obtained, and the method comprises the following steps:

when the water pump periodically operates, the average water temperature of the engine cooling system when the water pump operates is obtained, and the average water temperature is used as the water temperature of the engine cooling system.

2. The method of controlling an engine cooling system according to claim 1, wherein the step of detecting whether the engine exits the warm-up condition based on the water temperature includes:

when the water temperature is higher than the preset temperature, judging that the engine is out of the warming-up working condition;

and when the water temperature is less than or equal to the preset temperature, judging that the engine does not exit the warm-up working condition.

3. The control method of the engine cooling system according to claim 1, wherein the step of acquiring the water temperature of the engine cooling system while the water pump is operating periodically comprises:

when the water pump runs periodically, acquiring the average water temperature of an engine cooling system in a single running period of the water pump;

the average water temperature is used as the water temperature of the engine cooling system.

4. The control method of an engine cooling system according to claim 1, characterized in that the control method of an engine cooling system further comprises:

when the engine is started, acquiring the initial water temperature of an engine cooling system;

and when the initial water temperature is less than or equal to the preset temperature, determining that the engine is in a warming working condition.

5. The method for controlling an engine cooling system according to claim 1, wherein the step of detecting whether the engine exits the warm-up condition based on the water temperature is followed by the step of:

when the engine is detected not to exit the warm-up working condition, water flow corresponding to the water temperature is obtained;

when the water flow is less than or equal to the preset flow, returning to the step of controlling the water pump of the engine cooling system to periodically run;

and when the water flow is larger than the preset flow, controlling the water pump of the engine cooling system to periodically operate according to the target rotating speed corresponding to the water temperature, and returning to execute the step of acquiring the water temperature of the engine cooling system when the water pump is operated periodically.

6. The method of controlling an engine cooling system according to claim 1, wherein the step of controlling a water pump of the engine cooling system to operate periodically while the engine is in a warm-up condition comprises:

when the engine is in a warm-up working condition, detecting whether each module of the vehicle has a heat exchange requirement or not, wherein the module of the vehicle comprises a passenger compartment, the engine and an exhaust gas recirculation system;

all modules of the vehicle do not have heat exchange requirements, and a water pump of an engine cooling system is controlled to run periodically.

7. The method for controlling the cooling system of the engine as claimed in claim 6, wherein after the step of detecting whether the heat exchange requirement exists among the modules of the vehicle when the engine is in the warm-up condition, the method further comprises the following steps:

when at least one module of the vehicle has a heat exchange requirement, adjusting a three-way valve of a cooling pipeline where the water pump is located to enable the cooling pipeline where the water pump is located to be communicated with the module with the heat exchange requirement to form a cooling loop;

and controlling the water pump to operate according to the target rotating speed corresponding to the water temperature of the engine cooling system.

8. The method of controlling an engine cooling system according to claim 6, wherein the step of detecting whether a heat exchange demand exists in each module of the vehicle includes at least one of:

detecting whether a heating request of a passenger compartment is triggered or not so as to judge whether a heat exchange requirement exists in the passenger compartment or not;

detecting whether a minimum water flow request of an engine cooling system is triggered or not so as to judge whether the engine has a heat exchange requirement or not;

whether the cooling requirement of the exhaust gas recirculation system is triggered or not is detected so as to judge whether the exhaust gas recirculation system has a heat exchange requirement or not.

9. A vehicle, characterized in that the vehicle comprises: memory, a processor and a control program of an engine cooling system stored on the memory and executable on the processor, the control program of the engine cooling system, when executed by the processor, implementing the steps of the control method of the engine cooling system according to any one of claims 1 to 8.

10. A computer storage medium, characterized in that a control program of an engine cooling system is stored thereon, which when executed by a processor implements the steps of the control method of the engine cooling system according to any one of claims 1 to 8.

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