Engine control method, system and vehicle

Abstract

The embodiment of the present application provides an engine control method, the method comprising: obtaining a first ambient temperature within a first preset time before the engine is turned off; determining the magnitude relationship between the first ambient temperature and the preset ambient temperature, the preset ambient temperature being determined according to the use temperature of high-grade fuel; according to the magnitude relationship between the first ambient temperature and the preset ambient temperature, responding to an engine shutdown signal, controlling the engine to shut down with a corresponding grade of fuel, and recording the shutdown duration; according to the shutdown duration and the first ambient temperature, responding to an engine start signal, controlling the engine to start with a corresponding grade of fuel. Thus, the engine can run with appropriate fuel at different ambient temperatures, avoiding the problem of frequently switching between high and low grade fuels at different ambient temperatures and when parking for a short time.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to an engine control method, system and vehicle. Background Art

[0002] In the prior art, diesel vehicles are generally equipped with main and auxiliary fuel tanks to provide different grades of fuel to the engine. In low-temperature environments, the auxiliary fuel tank is often used to provide low-grade fuel, and in normal temperature environments, the main fuel tank is used to provide high-grade fuel. However, the switching between high and low-grade fuels requires the driver's experience to choose the switching time. Since the switching time between high and low-grade fuels is difficult to accurately grasp, frequent switching problems will occur during the start and stop of the vehicle.

[0003] Therefore, a new engine control method is urgently needed. Summary of the invention

[0004] In view of the above problems, the embodiments of the present application provide an engine control method, system and vehicle to solve the problem in the prior art that the timing of switching between high and low grade fuel cannot be accurately grasped, resulting in the need to frequently switch between high and low grade fuel under different ambient temperatures.

[0005] In a first aspect of an embodiment of the present application, there is provided an engine control method, the method comprising:

[0006] Acquiring a first ambient temperature of the engine within a first preset time period before the engine is turned off;

[0007] Determine the magnitude relationship between the first ambient temperature and a preset ambient temperature, wherein the preset ambient temperature is determined according to the use temperature of high-grade fuel;

[0008] According to the magnitude relationship between the first ambient temperature and the preset ambient temperature, in response to an engine shutdown signal, the engine is controlled to shut down with a corresponding brand of fuel, and the shutdown duration is recorded;

[0009] According to the flameout duration and the first ambient temperature, in response to an engine start signal, the engine is controlled to start with fuel of a corresponding grade.

[0010] Optionally, the controlling the engine to shut down with a corresponding brand of fuel and recording the shut down duration in response to an engine shut down signal according to the magnitude relationship between the first ambient temperature and the preset ambient temperature includes:

[0011] In response to the engine shutdown signal, when the first ambient temperature is not higher than the preset ambient temperature, controlling the engine to run with low-grade fuel for a second preset time and then shut down;

[0012] After the engine is turned off, the duration of the engine being turned off is recorded.

[0013] Optionally, the controlling the engine to start with a corresponding brand of fuel in response to an engine start signal according to the flameout duration and the first ambient temperature comprises:

[0014] In response to the engine start signal, when the first ambient temperature is not higher than the preset ambient temperature, the engine is controlled to start with fuel of a grade corresponding to the duration of the engine being shut down, according to the duration of the engine being shut down.

[0015] Optionally, controlling the engine to start with fuel of a grade corresponding to the duration of the engine being turned off according to the duration of the engine being turned off includes:

[0016] When the engine is turned off for a period longer than a third preset period, controlling the engine to start with low-grade fuel;

[0017] When the engine is shut down for a period of time not longer than the third preset period of time, the engine is controlled to start with the high-grade fuel.

[0018] Optionally, after controlling the engine to start with low-grade fuel, the method further comprises:

[0019] Acquiring the temperature of the cooling water of the engine and the temperature of the lubricating oil of the engine;

[0020] Determining whether the temperature of the cooling water is higher than a preset cooling water temperature, and whether the temperature of the lubricating oil is higher than a preset lubricating oil temperature;

[0021] When the temperature of the cooling water is higher than the preset cooling water temperature, and the temperature of the lubricating oil is higher than the preset lubricating oil temperature, the cooling water and / or the lubricating oil are controlled to heat the high-grade fuel.

[0022] Optionally, after heating the high-grade fuel, the method further comprises:

[0023] Acquiring the temperature of the high-grade fuel, and determining whether the temperature of the high-grade fuel is greater than a first target fuel temperature;

[0024] When the temperature of the high-grade fuel is greater than the first target fuel temperature, the low-grade fuel is switched to the high-grade fuel.

[0025] Optionally, it also includes:

[0026] monitoring the temperature of the high grade fuel;

[0027] When it is detected that the temperature of the high-grade fuel is lower than the first target fuel temperature, controlling the cooling water and / or the lubricating oil to heat the high-grade fuel;

[0028] When it is monitored that the temperature of the high-grade fuel is higher than the second target fuel temperature, heating of the high-grade fuel is stopped.

[0029] Optionally, it also includes:

[0030] When the first ambient temperature is higher than the preset ambient temperature, the engine is controlled to be shut down or started with the high-grade fuel.

[0031] According to a second aspect of the embodiment of the present application, there is provided a system for executing the engine control method according to the first aspect of the embodiment of the present application, the system comprising: an ECU, an engine, an ambient temperature sensor, a solenoid valve, an oil temperature sensor, a fuel switching valve, a low-grade fuel tank, a high-grade fuel tank, a fuel filter, and a heat exchanger; the ECU is used to execute the engine control method according to the first aspect of the embodiment of the present application;

[0032] The ECU is respectively connected to the engine, the ambient temperature sensor, the solenoid valve, the oil temperature sensor and the fuel switching valve;

[0033] The fuel switching valve is connected to the low-grade fuel tank and the high-grade fuel tank respectively, and is connected to the engine through the fuel filter;

[0034] The engine is connected to the heat exchanger via the solenoid valve;

[0035] The high-grade fuel tank is respectively connected to the heat exchanger and the oil temperature sensor.

[0036] According to a third aspect of the embodiments of the present application, a vehicle is provided, wherein the vehicle comprises the system as described in the second aspect of the embodiments of the present application.

[0037] This application has the following advantages:

[0038] The embodiment of the present application provides an engine control method, the method comprising: obtaining a first ambient temperature within a first preset time before the engine is turned off; determining the magnitude relationship between the first ambient temperature and the preset ambient temperature, the preset ambient temperature being determined according to the use temperature of high-grade fuel; according to the magnitude relationship between the first ambient temperature and the preset ambient temperature, in response to an engine shutdown signal, controlling the engine to shut down with a corresponding grade of fuel, and recording the shutdown duration; according to the shutdown duration and the first ambient temperature, in response to an engine start signal, controlling the engine to start with a corresponding grade of fuel. The present application controls the engine to shut down with a corresponding grade of fuel according to the first ambient temperature within a first preset time before the engine is turned off, and records the shutdown duration, and controls the engine to start with a corresponding grade of fuel according to the shutdown duration and the first ambient temperature, so that the engine can run with appropriate fuel at different ambient temperatures, avoiding the problem of frequent switching of high and low grade fuels at different ambient temperatures and when parking for a short time. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0040] Figure 1 is a schematic diagram of an engine control method provided by an embodiment of the present application;

[0041] Figure 2 It is a flowchart of a vehicle shutdown stage provided by an embodiment of the present application;

[0042] Figure 3 This is a flowchart of a vehicle low-temperature startup phase provided by an embodiment of the present application;

[0043] Figure 4 It is a flowchart of a vehicle operation phase provided by an embodiment of the present application;

[0044] Figure 5 It is a schematic diagram of an engine control system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] The exemplary embodiments of the present application will be described in more detail below in conjunction with the accompanying drawings in the embodiments of the present application. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present application and to enable the scope of the present application to be fully communicated to those skilled in the art.

[0046] As we all know, diesel contains a certain amount of wax. During the engine shutdown process, as the temperature drops, these waxes will gradually precipitate and form wax crystals, causing the diesel to solidify and form diesel wax. Waxing makes the fluidity of diesel worse, and at the same time, it seriously hinders the smooth flow of the fuel supply pipeline, resulting in difficulty in fuel supply to the vehicle, making the engine unable to start or insufficient fuel supply. Therefore, in order to adapt to the environment in the north and other cold regions (below -20℃), diesel models usually use lower-grade diesel (such as -35# diesel) as power. Although it will not wax, the power and economy of low-grade diesel are not as good as high-grade diesel, and low-grade diesel is usually more expensive, which increases the cost of using the vehicle.

[0047] In the prior art, diesel vehicles are generally equipped with main and auxiliary fuel tanks to provide different grades of fuel to the engine. In low-temperature environments, the auxiliary fuel tank is often used to provide low-grade fuel, while in normal temperature environments, the main fuel tank is used to provide high-grade fuel. For example, the low-grade diesel contained in the auxiliary fuel tank may be -35# diesel, and the high-grade diesel contained in the main fuel tank may be 0# diesel.

[0048] When the vehicle is started, the driver manually operates the switching switch to switch the fuel tank to the auxiliary fuel tank to supply the engine with low-grade fuel for a period of time, and then manually operates the engine's cooling water circulation system to heat the high-grade diesel in the main fuel tank with the hot water. When the diesel temperature in the main fuel tank rises to a temperature at which the diesel in the main tank can work normally, the driver manually operates the switching switch to allow the main fuel tank to supply the engine with high-grade fuel. To ensure that the vehicle can start normally the next day, before the vehicle is parked and turned off, the driver is also required to manually operate the switching switch to allow the auxiliary fuel tank to supply the engine with low-grade fuel for a period of time until the oil circuit is filled with low-grade diesel before the engine can be shut down, to ensure that the fuel in the oil circuit does not condense and block the oil circuit when it is started next time.

[0049] The above operation process is completely based on the driver's experience, and it is difficult to accurately grasp the timing of switching between high-grade and low-grade fuel. When the vehicle starts, if the switch is too early, the main fuel tank is not fully heated, and the high-grade fuel in the main fuel tank is still viscous, which will cause the engine to stall during the switching process. If the switch is too late, it will increase the fuel consumption cost; at the same time, the timing of manually operating the engine's cooling water to heat the high-grade fuel in the main fuel tank is also difficult to grasp. Starting too early will affect the engine warm-up time, and insufficient warm-up will cause faults; and before the vehicle stops and the engine is turned off, the time of switching to the auxiliary fuel tank for fuel supply is too short, and the oil circuit is not completely filled with low-grade diesel, which will cause difficulty in starting next time; switching to the auxiliary fuel tank for fuel supply for too long will increase the fuel consumption cost; if the driver forgets to switch the main fuel tank to the auxiliary fuel tank before turning off the engine, the vehicle will not be able to start next time, affecting the normal use of the vehicle, or forget the switching operation of the main and auxiliary fuel tanks after the vehicle starts, resulting in long-term use of the auxiliary fuel tank for fuel supply, which increases the cost of using the vehicle. Therefore, in order to avoid the above problems, the driver needs to frequently switch between high and low-grade fuel.

[0050] In view of the above problems, in a first aspect, an embodiment of the present application provides an engine control method, such as Figure 1 As shown, the method is applied to an ECU (Electronic Control Unit) of a vehicle, and the method comprises:

[0051] Step S101, obtaining a first ambient temperature within a first preset time period before the engine is turned off;

[0052] Step S102, determining the magnitude relationship between the first ambient temperature and a preset ambient temperature, wherein the preset ambient temperature is determined based on the use temperature of high-grade fuel;

[0053] Step S103, according to the magnitude relationship between the first ambient temperature and the preset ambient temperature, in response to an engine shutdown signal, controlling the engine to shut down with a corresponding brand of fuel, and recording the shutdown duration;

[0054] Step 104 , controlling the engine to start with a corresponding brand of fuel in response to an engine start signal based on the flameout duration and the first ambient temperature.

[0055] In an embodiment of the present application, the surrounding ambient temperature is obtained during the driving of the vehicle. In actual applications, the surrounding ambient temperature can be obtained by an ambient temperature sensor installed around the vehicle, and the obtained ambient temperature is sent to the vehicle's ECU; specifically, the surrounding ambient temperature can be monitored in real time by the ambient temperature sensor, and the real-time monitored surrounding ambient temperature can be obtained, and the obtained ambient temperature is sent to the vehicle's ECU, and the vehicle's ECU can further store the obtained ambient temperature in a storage medium.

[0056] Furthermore, when the vehicle is turned off, the vehicle's ECU obtains the ambient temperature within a first preset time period before the vehicle is turned off from the ambient temperature stored in the storage medium. In actual applications, the ambient temperature of the vehicle within the first preset time period before the vehicle is turned off is not constant, but different moments within the first preset time period correspond to different ambient temperatures. Therefore, the first ambient temperature of the vehicle within the first preset time period before the vehicle is turned off can be determined by calculating the average value of the different ambient temperatures corresponding to different moments within the first preset time period.

[0057] Furthermore, after determining the first ambient temperature of the vehicle within a first preset time period before the engine is turned off, the relationship between the first ambient temperature and the preset ambient temperature is determined. In actual applications, the preset ambient temperature is determined based on the operating temperature of the high-grade fuel. It can be understood that the preset ambient temperature varies depending on the high-grade fuel used in the vehicle.

[0058] Further, according to the magnitude relationship between the first ambient temperature and the preset ambient temperature, in response to the engine shutdown signal, the engine is controlled to shut down with the corresponding brand of fuel, and the shutdown duration is recorded. According to the shutdown duration and the first ambient temperature, in response to the engine start signal, the engine is controlled to start with the corresponding brand of fuel.

[0059] During the driving of the vehicle, the surrounding ambient temperature is obtained and sent to the vehicle's ECU, and the vehicle's ECU can further store the obtained ambient temperature in a storage medium.

[0060] When the vehicle is turned off, the vehicle's ECU obtains the first ambient temperature within a first preset time before the vehicle is turned off from the ambient temperature stored in the storage medium. It should be noted that the calculation method of the first ambient temperature is as described above and will not be repeated here.

[0061] Furthermore, based on the high-grade fuel used in the vehicle, the use temperature corresponding to the high-grade fuel is determined, and based on the use temperature of the high-grade fuel, the preset ambient temperature is determined.

[0062] Further, after determining the magnitude relationship between the first ambient temperature and the preset ambient temperature, and according to the magnitude relationship between the first ambient temperature and the preset ambient temperature, in response to the engine flameout signal, the engine is controlled to flameout with the corresponding brand of fuel, wherein the first ambient temperature is higher than the preset ambient temperature, indicating that the ambient temperature of the engine has reached the use temperature requirement of the high-grade fuel for a period of time before the flameout, at this time, the problem of fuel waxing will not occur when the high-grade fuel is used as fuel, so there is no need to consider the switching of high-grade and low-grade fuels. Since high-grade fuel has better power and economy than low-grade fuel, therefore, when the first ambient temperature is higher than the preset ambient temperature, the engine is controlled to run with high-grade fuel, which reduces the cost of fuel consumption and ensures the power of the vehicle; the first ambient temperature is not higher than the preset ambient temperature, indicating that the ambient temperature of the engine has not reached the use temperature requirement of the high-grade fuel for a period of time before the flameout, at this time, it is necessary to run with the bottom-grade good fuel for a period of time and then flameout, so that the oil circuit is filled with low-grade diesel.

[0063] In a preferred embodiment, the controlling the engine to shut down with a corresponding brand of fuel and recording the shut down duration in response to an engine shut down signal according to the magnitude relationship between the first ambient temperature and the preset ambient temperature includes:

[0064] In response to the engine shutdown signal, when the first ambient temperature is not higher than the preset ambient temperature, controlling the engine to run with low-grade fuel for a second preset time and then shut down;

[0065] After the engine is turned off, the duration of the engine being turned off is recorded.

[0066] Specifically, in this embodiment, when the ECU of the vehicle receives the Key-off information, it determines the magnitude relationship between the first ambient temperature obtained and the preset ambient temperature, and the Key-off information includes the engine flameout signal; if the first ambient temperature is higher than the preset ambient temperature, the engine is directly flameout controlled in response to the received engine flameout signal. If the first ambient temperature is not higher than the preset ambient temperature, the ECU of the vehicle controls the engine to run with low-grade fuel in response to the engine flameout signal, when the first ambient temperature is not higher than the preset ambient temperature. It should be noted that under normal circumstances, when the vehicle is running normally, high-grade fuel is used as fuel to supply fuel to the engine. Therefore, when the first ambient temperature is not higher than the preset ambient temperature, the ECU of the vehicle controls the high-grade fuel to switch to low-grade fuel, adopts the post-operation strategy, controls the engine to continue to run with low-grade fuel for a second preset time, and controls the engine to flameout after each oil circuit of the vehicle is filled with low-grade fuel. In practical applications, the post-operation strategy refers to a control strategy that continues to run for a period of time after the car engine is turned off. In a traditional automobile engine, shutting down the engine does not mean that all running parts stop running immediately, but it takes a certain amount of time for them to gradually cool down. The post-operation strategy usually continues to run certain parts of the engine, such as the cooling water pump, oil pump, fan, etc., after the ECU receives the engine shutdown signal, to ensure that these parts can still operate normally before cooling, thereby extending their service life. The post-operation strategy is usually controlled by the vehicle's ECU, and the specific operating time and components will vary depending on the model and manufacturer, so this application is not limited here.

[0067] Optionally, after the engine is turned off, the duration of the vehicle being turned off is recorded by the vehicle's ECU. In practical applications, the ECU can record the time of the engine being turned off and the time of the next power-on start of the engine, thereby calculating the duration of the engine being turned off.

[0068] like Figure 2 A flowchart of a vehicle shutdown phase provided in an embodiment of the present application, referring to Figure 2 As shown: after the vehicle's ECU receives the key-off information, it obtains the first ambient temperature within the first preset time before shutdown from the storage medium, and determines whether the first ambient temperature is higher than the preset ambient temperature. If so, the engine is controlled to shut down directly; if not, the vehicle's ECU control switches to low-grade fuel, and starts the post-operation strategy to control the engine to idle for the second preset time to ensure that the engine can be started smoothly next time. After controlling the engine to idle for the second preset time, the entire vehicle is powered off, shut down, and the shutdown time is recorded.

[0069] In the present application, during the shutdown stage, the engine is controlled to shut down with the corresponding brand of fuel based on the relationship between the first ambient temperature within the first preset time period before shutdown and the preset ambient temperature. In particular, when the first ambient temperature is not higher than the preset ambient temperature, the engine is controlled to run with low-grade fuel for a period of time and then shut down, so that the oil circuit is filled with low-grade fuel. This ensures that the fuel in the oil circuit does not condense and block the oil circuit in a cold environment, and can also ensure that the engine can be started smoothly next time. At the same time, the corresponding brand of fuel is selected according to the ambient temperature, avoiding the inconvenience of frequent switching of high and low brands of fuel due to inaccurate driver experience judgment.

[0070] In a preferred embodiment, the controlling the engine to start with a corresponding brand of fuel in response to an engine start signal according to the flameout duration and the first ambient temperature comprises:

[0071] In response to the engine start signal, when the first ambient temperature is not higher than the preset ambient temperature, the engine is controlled to start with fuel of a grade corresponding to the duration of the engine being shut down, according to the duration of the engine being shut down.

[0072] When the engine is turned off for a period longer than a third preset period, controlling the engine to start with low-grade fuel;

[0073] When the engine is shut down for a period of time not longer than the third preset period of time, the engine is controlled to start with the high-grade fuel.

[0074] Specifically, the vehicle's ECU receives an engine start signal and determines the relationship between the acquired first ambient temperature and the preset ambient temperature; if the first ambient temperature is not higher than the preset ambient temperature, the engine shutdown duration is acquired, and the relationship between the engine shutdown duration and a third preset duration is determined; and based on the relationship between the engine shutdown duration and the third preset duration, the engine is controlled to start with the fuel of the brand corresponding to the engine shutdown duration.

[0075] When the engine is turned off for a period of time longer than the third preset period of time, the engine is controlled to start with low-grade fuel. In actual applications, when the first ambient temperature is not higher than the preset ambient temperature, the fuel has been switched to low-grade fuel when the engine is turned off. Therefore, in this step, when the first ambient temperature is not higher than the preset ambient temperature, there is no need to switch the fuel again, and the engine can be started directly, avoiding the inconvenience of the driver manually switching between high and low grades of fuel frequently.

[0076] When the engine is turned off for a period of time not greater than the third preset period of time, the engine is controlled to start with high-grade fuel. For example, when the driver only gets off the vehicle to eat, go to the toilet or take a short rest, in this case, the engine is turned off for a short time, and the temperature of the high-grade fuel is higher, which can still meet the temperature required for use. When the first ambient temperature is not higher than the preset ambient temperature, the fuel has been switched to low-grade fuel when the engine is turned off. Therefore, in this step, it is necessary to switch the low-grade fuel to high-grade fuel to start the engine, so as to avoid the increase in fuel consumption cost caused by starting with low-grade fuel after the vehicle is turned off for a short time, and to avoid frequent switching of high and low-grade fuels when starting the vehicle after a short stop.

[0077] Furthermore, after controlling the engine to start with the low-grade fuel, the method further includes:

[0078] Acquiring the temperature of the cooling water of the engine and the temperature of the lubricating oil of the engine;

[0079] Determining whether the temperature of the cooling water is higher than a preset cooling water temperature, and whether the temperature of the lubricating oil is higher than a preset lubricating oil temperature;

[0080] When the temperature of the cooling water is higher than the preset cooling water temperature, and the temperature of the lubricating oil is higher than the preset lubricating oil temperature, the cooling water and / or the lubricating oil are controlled to heat the high-grade fuel.

[0081] Specifically, after the engine is controlled to start with low-grade fuel, the temperature of the cooling water can be obtained through the engine water temperature sensor, and the temperature of the lubricating oil can be obtained through the engine oil temperature sensor;

[0082] It is further determined whether the cooling water temperature is higher than the preset cooling water temperature and whether the lubricating oil temperature is higher than the preset lubricating oil temperature, wherein the preset cooling water temperature is determined based on the cooling water temperature after the engine warms up, and the preset lubricating oil temperature is determined based on the lubricating oil temperature after the engine warms up.

[0083] When the temperature of the cooling water is higher than the preset cooling water temperature, and the temperature of the lubricating oil is higher than the preset lubricating oil temperature, it indicates that the engine warm-up is finished, and the vehicle's ECU controls the cooling water and / or lubricating oil to heat the high-grade fuel. It should be noted that after the engine is started, the combustion is not ideal and the operation is unstable due to the low temperature in the cylinder just after starting. The engine is in the warm-up stage. In order to improve the warm-up efficiency, the ECU controls the cooling water and / or lubricating oil not to heat the high-grade fuel.

[0084] Furthermore, after heating the high-grade fuel, the method further comprises:

[0085] Acquiring the temperature of the high-grade fuel, and determining whether the temperature of the high-grade fuel is greater than a first target fuel temperature;

[0086] When the temperature of the high-grade fuel is greater than the first target fuel temperature, the low-grade fuel is switched to the high-grade fuel.

[0087] Further, monitoring the temperature of the high-grade fuel;

[0088] When it is detected that the temperature of the high-grade fuel is lower than the first target fuel temperature, controlling the cooling water and / or the lubricating oil to heat the high-grade fuel;

[0089] When it is monitored that the temperature of the high-grade fuel is higher than the second target fuel temperature, heating of the high-grade fuel is stopped.

[0090] Specifically, the temperature of high-grade fuel can be acquired and monitored in real time through the fuel temperature sensor. When it is determined that the temperature of high-grade fuel is greater than the first target fuel temperature, the low-grade fuel is switched to high-grade fuel. The high-grade fuel is used to supply fuel, which improves the vehicle's power and economy and reduces the cost of using the vehicle.

[0091] When it is monitored that the temperature of the high-grade fuel decreases and is lower than the first target fuel temperature, the cooling water and / or lubricating oil is controlled to continue to heat the high-grade fuel, thereby ensuring that the high-grade fuel can maintain the best combustion efficiency. When it is monitored that the temperature of the high-grade fuel increases and is higher than the second target fuel temperature, the heating of the high-grade fuel is stopped, while maintaining the best combustion efficiency of the high-grade fuel, the engine's demand for fan heat dissipation is reduced. In actual applications, the first target fuel temperature and the second target fuel temperature are the best temperature ranges determined based on the best combustion efficiency of the high-grade fuel. For fuels of different grades, the temperature ranges of the best combustion efficiency are different, and this application does not limit this.

[0092] like Figure 3 A flowchart of a low-temperature vehicle startup phase provided in an embodiment of the present application, referring to Figure 3 As shown: after receiving the vehicle power-on signal, the ECU responds to the engine start signal, obtains the duration of the engine shutdown, and determines whether the duration of the engine shutdown is longer than the third preset duration; if the duration of the engine shutdown is not longer than the third preset duration, the engine is controlled to switch to high-grade fuel for startup. If the duration of the engine shutdown is longer than the third preset duration, the engine is controlled to start directly with low-grade fuel, and after the engine warm-up is completed, the high-grade fuel is heated. When the temperature of the high-grade fuel rises to the first target fuel temperature, the ECU controls the switch from low-grade fuel to high-grade fuel, and the engine is supplied with fuel through the high-grade fuel.

[0093] like Figure 4 A flowchart of a vehicle operation phase provided in an embodiment of the present application, referring to Figure 4 As shown: When the vehicle is driving, the oil temperature sensor obtains the temperature of the high-grade fuel, monitors the obtained temperature of the high-grade fuel, and determines whether the temperature of the high-grade fuel is within the preset temperature range. If the temperature of the high-grade fuel is higher than the preset temperature range, the ECU controls to stop heating the high-grade fuel. If the temperature of the high-grade fuel is lower than the preset temperature range, the ECU controls to heat the high-grade fuel.

[0094] In an optional embodiment, when the first ambient temperature is higher than the preset ambient temperature, the engine is controlled to shut down or start with a high-grade fuel.

[0095] Specifically, when the first ambient temperature is higher than the preset ambient temperature, high-grade fuel will not wax, so there is no need to switch to low-grade fuel.

[0096] The embodiment of the present application provides an engine control method, the method comprising: obtaining a first ambient temperature within a first preset time before the engine is turned off; determining the magnitude relationship between the first ambient temperature and the preset ambient temperature, the preset ambient temperature being determined according to the use temperature of high-grade fuel; according to the magnitude relationship between the first ambient temperature and the preset ambient temperature, in response to an engine shutdown signal, controlling the engine to shut down with a corresponding grade of fuel, and recording the shutdown duration; according to the shutdown duration and the first ambient temperature, in response to an engine start signal, controlling the engine to start with a corresponding grade of fuel. The present application controls the engine to shut down with a corresponding grade of fuel according to the first ambient temperature within a first preset time before the engine is turned off, and records the shutdown duration, and controls the engine to start with a corresponding grade of fuel according to the shutdown duration and the first ambient temperature, so that the engine can run with appropriate fuel at different ambient temperatures, avoiding the problem of frequent switching of high and low grade fuels at different ambient temperatures and when parking for a short time.

[0097] A second aspect of the embodiment of the present application provides a system for executing the engine control method described in the first aspect of the present application, wherein the system is as follows: Figure 5 As shown, the system includes: an ECU, an engine, an ambient temperature sensor, a solenoid valve, an oil temperature sensor, a fuel switching valve, a low-grade fuel tank, a high-grade fuel tank, a fuel filter, and a heat exchanger; the ECU is used to execute the engine control method described in the first aspect of the present application;

[0098] The ECU is respectively connected to the engine, the ambient temperature sensor, the solenoid valve, the oil temperature sensor and the fuel switching valve;

[0099] The fuel switching valve is connected to the low-grade fuel tank and the high-grade fuel tank respectively, and is connected to the engine through the fuel filter;

[0100] The engine is connected to the heat exchanger via the solenoid valve;

[0101] The high-grade fuel tank is respectively connected to the heat exchanger and the oil temperature sensor.

[0102] Specifically, the ECU controls the switching of the fuel switching valve to open the low-grade fuel tank or the high-grade fuel tank. When the fuel switching valve is switched to the low-grade fuel tank, the low-grade fuel tank supplies fuel to the engine, and the low-grade fuel in the low-grade fuel tank flows through the fuel switching valve and the fuel filter before entering the engine. When the fuel switching valve is switched to the high-grade fuel tank, the high-grade fuel tank supplies fuel to the engine, and the high-grade fuel in the high-grade fuel tank flows through the fuel switching valve and the fuel filter before entering the engine.

[0103] The ECU receives the engine shutdown signal, obtains the first ambient temperature within the first preset time through the ambient temperature sensor, and controls the fuel switching valve to switch to the corresponding brand of fuel tank according to the size relationship between the first ambient temperature and the preset ambient temperature. When the first ambient temperature is higher than the preset ambient temperature, the fuel switching valve is controlled to switch to the high-grade fuel tank to control the engine to shut down. When the first ambient temperature is not higher than the preset ambient temperature, the ECU controls the fuel switching valve to switch to the low-grade fuel, and controls the engine to idle for the second preset time, and then controls the engine to shut down. At the same time, the ECU records the engine shutdown time.

[0104] When the ECU receives a vehicle power-on signal, if the first ambient temperature is higher than the preset ambient temperature, the engine is started directly. If the first ambient temperature is not higher than the preset ambient temperature, the fuel switching valve is controlled to switch to a fuel tank of a grade corresponding to the flameout duration according to the flameout duration. If the flameout duration is not greater than the third preset duration, the fuel switching valve is controlled to switch to a high-grade fuel tank. If the flameout duration is greater than the third preset duration, the engine is controlled to start directly.

[0105] When the vehicle is running, after the engine warm-up is completed, the ECU controls the solenoid valve to open, and the high-grade fuel in the high-grade fuel tank is heated by cooling water and / or lubricating oil flowing through the heat exchanger, and the temperature of the high-grade fuel is obtained and monitored in real time through the oil temperature sensor. If the temperature of the high-grade fuel rises to the first target fuel temperature, the ECU controls the fuel switching valve to switch to the high-grade fuel tank, and the high-grade fuel tank is used to provide fuel for the engine operation. If the temperature of the high-grade fuel is detected to be lower than the first target fuel temperature, the solenoid valve is opened to heat the high-grade fuel through cooling water and / or lubricating oil. If the temperature of the high-grade fuel is detected to be higher than the second target fuel temperature, the solenoid valve is closed to stop heating the high-grade fuel.

[0106] According to a third aspect of the embodiments of the present application, a vehicle is provided, wherein the vehicle comprises the system as described in the second aspect of the embodiments of the present application.

[0107] Each embodiment in this specification focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referenced to each other.

[0108] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, devices, or computer program products. Therefore, the embodiments of the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the embodiments of the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0109] The embodiments of the present application are described with reference to the flowcharts and / or block diagrams of the methods, terminal devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0110] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0111] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device so that a series of operating steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable terminal device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0112] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application.

[0113] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0114] The above provides a detailed introduction to an engine control method, system and vehicle. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for general technicians in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An engine control method, characterized in that: The method comprises: Acquiring a first ambient temperature of the engine within a first preset time period before the engine is turned off; Determine the magnitude relationship between the first ambient temperature and a preset ambient temperature, wherein the preset ambient temperature is determined according to the use temperature of high-grade fuel; According to the magnitude relationship between the first ambient temperature and the preset ambient temperature, in response to an engine shutdown signal, the engine is controlled to shut down with a corresponding brand of fuel, and the shutdown duration is recorded; According to the flameout duration and the first ambient temperature, in response to an engine start signal, controlling the engine to start with a corresponding brand of fuel; When the first ambient temperature is not higher than the preset ambient temperature, according to the duration of the engine being turned off, controlling the engine to start with a fuel of a grade corresponding to the duration of the engine being turned off, comprises: When the engine is turned off for a period longer than a third preset period, controlling the engine to start with low-grade fuel; When the engine is shut down for a period of time not longer than the third preset period of time, the engine is controlled to start with the high-grade fuel.

2. The engine control method according to claim 1, characterized in that: The method of controlling the engine to shut down with a corresponding brand of fuel and recording the shut down duration in response to an engine shut down signal according to the magnitude relationship between the first ambient temperature and the preset ambient temperature includes: In response to the engine shutdown signal, when the first ambient temperature is not higher than the preset ambient temperature, controlling the engine to run with low-grade fuel for a second preset time and then shut down; After the engine is turned off, the duration of the engine being turned off is recorded.

3. The engine control method according to claim 1, characterized in that: After the controlling the engine to start with low grade fuel, the method further comprises: Acquiring the temperature of the cooling water of the engine and the temperature of the lubricating oil of the engine; Determining whether the temperature of the cooling water is higher than a preset cooling water temperature, and whether the temperature of the lubricating oil is higher than a preset lubricating oil temperature; When the temperature of the cooling water is higher than the preset cooling water temperature, and the temperature of the lubricating oil is higher than the preset lubricating oil temperature, the cooling water and / or the lubricating oil are controlled to heat the high-grade fuel.

4. The engine control method according to claim 3, characterized in that: After heating the high-grade fuel oil, the method further comprises: Acquiring the temperature of the high-grade fuel, and determining whether the temperature of the high-grade fuel is greater than a first target fuel temperature; When the temperature of the high-grade fuel is greater than the first target fuel temperature, the low-grade fuel is switched to the high-grade fuel.

5. The engine control method according to claim 4, characterized in that: Also includes: monitoring the temperature of the high grade fuel; When it is detected that the temperature of the high-grade fuel is lower than the first target fuel temperature, controlling the cooling water and / or the lubricating oil to heat the high-grade fuel; When it is monitored that the temperature of the high-grade fuel is higher than the second target fuel temperature, heating of the high-grade fuel is stopped.

6. The engine control method according to claim 1, characterized in that: Also includes: When the first ambient temperature is higher than the preset ambient temperature, the engine is controlled to be shut down or started with the high-grade fuel.

7. A system for executing the engine control method according to any one of claims 1 to 6, characterized in that: The system comprises: an ECU, an engine, an ambient temperature sensor, a solenoid valve, an oil temperature sensor, a fuel switching valve, a low-grade fuel tank, a high-grade fuel tank, a fuel filter, and a heat exchanger; the ECU is used to execute the engine control method according to any one of claims 1 to 6; The ECU is respectively connected to the engine, the ambient temperature sensor, the solenoid valve, the oil temperature sensor and the fuel switching valve; The fuel switching valve is connected to the low-grade fuel tank and the high-grade fuel tank respectively, and is connected to the engine through the fuel filter; The engine is connected to the heat exchanger via the solenoid valve; The high-grade fuel tank is respectively connected to the heat exchanger and the oil temperature sensor.

8. A vehicle, characterized in that: The vehicle comprises the system of claim 7.

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