Vehicle control method, vehicle and storage medium

Abstract

The invention provides a vehicle control method, a vehicle and a storage medium, and relates to the technical field of vehicle control. The method comprises the steps that the accumulated fuel injection quantity of an engine of the vehicle within a period of time is determined; determining the reverse towing duration based on the accumulated fuel injection quantity, wherein the reverse towing duration is the duration of reversely towing an engine by wheels of the vehicle through a transmission system of the vehicle; and the wheels are controlled to reversely drag the engine through the transmission system within the reverse dragging duration, so that water vapor in the crankcase of the engine is discharged out of the engine. In the embodiment of the invention, by controlling the wheels to reversely drag the engine through the transmission system within the reverse dragging time, water vapor in the crankcase of the engine can be discharged out of the engine as far as possible, and the situation that after the engine stops, the water vapor is condensed into liquid to enter an oil pan to cause engine oil dilution is prevented, so that the engine oil emulsification degree can be reduced; the wear degree of the engine is reduced, and the user experience is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle control technology, and in particular to a vehicle control method, a vehicle, and a storage medium. Background Art

[0002] The engine is the core component of a vehicle. Its main function is to convert the chemical energy obtained from fuel combustion into mechanical energy, thereby driving the vehicle. To reduce emissions and pollution, some vehicles use ethanol fuel. The main combustion products of ethanol fuel are water and carbon dioxide.

[0003] The engine's crankcase houses several moving parts, such as the crankshaft. To reduce wear and tear among these moving parts, engine oil is placed in the crankcase to lubricate and reduce wear and tear. In an engine, water, a combustion product of ethanol fuel, can enter the engine's crankcase and mix with the engine oil.

[0004] When the engine is warm, water vapor enters the crankcase in gaseous form. As the engine rests, the crankcase temperature drops, causing the water vapor to condense into liquid water and mix with the engine oil, resulting in oil emulsification. Emulsified oil loses its fluidity, making it difficult to form an effective oil film on the surfaces of crankcase components. An oil film is crucial for minimizing direct contact between components. If this film fails to form, friction between components increases, leading to increased wear and tear, which can easily lead to engine damage. Summary of the Invention

[0005] In view of the above problems, the present application provides a vehicle control method, device, vehicle, and storage medium that overcome the above problems or at least partially solve the above problems. The technical solutions are as follows:

[0006] A vehicle control method, the method comprising: detecting a shutdown command, determining a cumulative fuel injection amount of a vehicle's engine within a preset time period; wherein the shutdown command is used to instruct the engine to stop burning fuel; the cumulative fuel injection amount is the total amount of fuel injected into a combustion chamber of the engine by the engine's injector within the preset time period; determining a reverse dragging time based on the cumulative fuel injection amount; wherein the reverse dragging time is the time during which the vehicle's wheels reverse drag the engine through the vehicle's transmission system, and the reverse dragging time is positively correlated with the cumulative fuel injection amount; controlling the wheels to reverse drag the engine through the transmission system within the reverse dragging time to discharge water vapor in the engine crankcase out of the engine.

[0007] In the present application, by controlling the wheels to reversely drag the engine through the transmission system within the reverse dragging time, the negative pressure state generated by the crankcase ventilation system can be maintained for a certain period of time, so that the water vapor in the engine crankcase is discharged to the crankcase ventilation system within a certain period of time, and the water vapor is discharged from the engine through the exhaust system, so as to discharge the water vapor in the engine crankcase from the engine as much as possible, and prevent the water vapor from condensing into liquid and entering the oil pan to dilute the engine oil after the engine stops. In this way, the emulsification degree of the engine oil can be reduced, thereby reducing the wear degree of the engine and improving the user experience.

[0008] Optionally, the wheels are controlled to reversely drag the engine through the transmission system within the reverse dragging time, including: in the process of the wheels reversely dragging the engine through the transmission system, if it is detected that the current time is the end time of the reverse dragging time, a disconnection electrical signal is sent to the clutch in the transmission system through the vehicle's electronic control unit to disconnect the transmission connection between the engine and the wheels.

[0009] In the present application, the electronic control unit in the vehicle controls the reverse dragging time more accurately, which can improve the efficiency of reducing the emulsification degree of the engine oil to a certain extent.

[0010] Optionally, determining the reverse drag time based on the cumulative fuel injection amount includes: determining the reverse drag time from a preset mapping relationship based on the cumulative fuel injection amount; wherein the preset mapping relationship is a correspondence between the cumulative fuel injection amount and the reverse drag time.

[0011] In this application, the preset mapping relationship can be used to obtain the reverse drag time for discharging water vapor in the engine crankcase from the engine, so as to discharge all the water vapor in the engine crankcase from the engine as much as possible, thereby reducing the emulsification degree of the engine oil, thereby reducing the wear degree of the engine and improving the user experience.

[0012] Optionally, the reverse drag time is determined from a preset mapping relationship based on the cumulative fuel injection amount, including: obtaining the reverse drag time based on a preset coefficient and the cumulative fuel injection amount; wherein the preset coefficient is used to characterize the reverse drag time corresponding to the cumulative fuel injection amount per unit mass.

[0013] In this application, a preset coefficient of the reverse drag time corresponding to the cumulative fuel injection amount per unit mass is used to obtain a more accurate reverse drag time, so as to discharge as much water vapor in the engine crankcase as possible from the engine, thereby reducing the emulsification degree of the engine oil, thereby reducing the wear degree of the engine and improving the user experience.

[0014] Optionally, the reverse drag time is determined from a preset mapping relationship based on the cumulative fuel injection amount, including: obtaining the reverse drag time from a preset reverse drag time table based on the cumulative fuel injection amount; wherein the preset reverse drag time table includes a correspondence between the mass range of the cumulative fuel injection and the reverse drag time.

[0015] In the present application, the target reverse dragging time can be quickly found through the pre-stored preset reverse dragging time table, thereby improving the speed of determining the reverse dragging time.

[0016] Optionally, the preset time period is the time period between engine start and engine stop.

[0017] In this application, by calculating the cumulative fuel injection amount in the time period from when the engine is started to when it is stopped, a more accurate cumulative fuel injection amount can be obtained, and then a more accurate reverse drag duration can be obtained, so as to discharge all the water vapor in the engine crankcase from the engine as much as possible, thereby reducing the emulsification degree of the engine oil, and then reducing the wear degree of the engine, thereby improving the user experience.

[0018] Optionally, controlling the wheels to reversely drag the engine through the transmission system within the reverse drag time includes: when it is detected that the vehicle is traveling downhill, controlling the wheels to reversely drag the engine through the transmission system within the reverse drag time.

[0019] In this application, when the vehicle is traveling downhill, the vehicle is affected by gravity and the vehicle is sliding down at a high speed. The wheels have sufficient speed to reversely pull the engine to expel as much moisture as possible from the engine crankcase, thereby reducing the degree of oil emulsification and, in turn, reducing engine wear. Moreover, when the wheels have sufficient speed to reversely pull the engine, there is no need to consume the vehicle's own energy (such as electricity), thus saving vehicle energy while reducing engine wear and improving the user experience.

[0020] Optionally, controlling the wheels to reversely drag the engine through the transmission system within the reverse drag time includes: when it is detected that the brake pedal of the vehicle is depressed, controlling the wheels to reversely drag the engine through the transmission system within the reverse drag time.

[0021] In this application, when it is detected that the vehicle's brake pedal is depressed, the vehicle will slowly slow down. The vehicle originally has a certain speed, and due to inertia, the wheels can drag the engine back, so there is no need to consume the vehicle's own energy (such as electricity). While saving vehicle energy, it reduces the wear of the engine and improves the user experience.

[0022] A vehicle control device, the device comprising: a first determination module, for detecting a shutdown instruction and recording a cumulative fuel injection amount of a vehicle's engine within a preset time period; wherein the shutdown instruction is used to instruct the engine to stop burning fuel; the cumulative fuel injection amount is the total amount of fuel injected into the engine's combustion chamber by the engine's injector within a preset time period; a second determination module, for determining a reverse dragging time based on the cumulative fuel injection amount; wherein the reverse dragging time is the time during which the vehicle's wheels reverse drag the engine through the vehicle's transmission system, and the reverse dragging time is positively correlated with the cumulative fuel injection amount; a control module, for controlling the wheels to reverse drag the engine through the transmission system within the reverse dragging time to discharge water vapor in the engine crankcase out of the engine.

[0023] A vehicle comprises: the vehicle includes a processor, and the processor is used to execute any one of the above vehicle control methods.

[0024] A computer-readable storage medium stores a program, which implements any of the above-mentioned vehicle control methods when executed by a processor.

[0025] A computer program product includes a computer program. When the computer program is executed by a processor of a computer device, the computer device is enabled to execute any one of the above-mentioned vehicle control methods.

[0026] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present disclosure. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0028] Figure 1 Shown is a schematic structural diagram of a hybrid vehicle provided by an exemplary embodiment of the present application;

[0029] Figure 2 An exemplary embodiment of the present application is shown. Figure 1 A schematic structural diagram of the components of the hybrid device 12;

[0030] Figure 3 An exemplary embodiment of the present application is shown. Figure 2 A schematic diagram of the structure of the engine;

[0031] Figure 4FIG2 is a flow chart of a vehicle control method provided by an exemplary embodiment of the present application;

[0032] Figure 5 FIG2 is a flow chart of a vehicle control method provided by another exemplary embodiment of the present application;

[0033] Figure 6 Shown is a structural schematic diagram of a vehicle control device provided by an exemplary embodiment of the present application;

[0034] Figure 7 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0036] Application Overview

[0037] As described in the background art, if the engine oil emulsifies, it can easily lead to engine damage and poor user experience.

[0038] In response to the above technical problems, an embodiment of the present application provides a vehicle control method, which includes: determining the cumulative fuel injection amount of the vehicle's engine over a period of time, the cumulative fuel injection amount being the total amount of fuel injected into the engine combustion chamber by the engine's injector over the aforementioned period of time; then, determining the reverse dragging time based on the cumulative fuel injection amount; wherein the reverse dragging time is the time the vehicle's wheels reverse drag the engine through the vehicle's transmission system, and the reverse dragging time is positively correlated with the cumulative fuel injection amount; then, controlling the wheels to reverse drag the engine through the transmission system within the reverse dragging time to discharge water vapor in the engine crankcase out of the engine.

[0039] It's understood that during reverse towing, the crankcase ventilation system can be under negative pressure. Negative pressure refers to a gas pressure state below normal pressure (i.e., one atmosphere), meaning the air pressure at a certain location is lower than the surrounding air pressure. For example, the crankcase ventilation system has a lower pressure than the area where the engine oil resides. This pressure differential drives gas from the higher-pressure area to the lower-pressure area, helping to expel moisture from the engine crankcase into the crankcase ventilation system and minimize the occurrence of oil emulsification.

[0040] An embodiment of the present application provides a vehicle control method, which controls the wheels to reversely drag the engine through the transmission system within the reverse drag time, and can maintain the negative pressure state generated by the crankcase ventilation system for a certain period of time, so that the water vapor in the engine crankcase is discharged to the crankcase ventilation system within a certain period of time, and the water vapor is discharged from the engine through the exhaust system, so as to discharge the water vapor in the engine crankcase from the engine as much as possible, and prevent the water vapor from condensing into liquid and entering the oil pan to dilute the engine oil after the engine stops. In this way, the emulsification degree of the engine oil can be reduced, thereby reducing the wear degree of the engine and improving the user experience.

[0041] Example scenarios

[0042] The vehicle control method provided in the embodiments of the present application can be applied to vehicles with engines. Vehicles include various types of vehicles, such as sedans, off-road vehicles, buses, trucks, etc. Specifically, in one example, the vehicle can be a hybrid electric vehicle (HEV). With the increasingly stringent emission regulations, hybrid electric vehicles can reduce emission pollution without the range anxiety of pure electric vehicles (EV), and are a solution that fully combines the advantages of both. Hybrid electric vehicles can be plug-in hybrid electric vehicles (PHEV), which are a new energy vehicle between pure electric vehicles and fuel vehicles. This type of vehicle has both the engine, transmission, drive system, oil circuit, and fuel tank of a traditional vehicle, as well as the battery, motor, and control circuit of a pure electric vehicle. In addition, the battery capacity is relatively large and there is a charging port. It combines the advantages of pure electric vehicles and hybrid electric vehicles, and can achieve pure electric and zero-emission driving, and can also increase the vehicle's driving range through hybrid mode.

[0043] The vehicle may also be a robot that can travel, and the embodiments of the present application do not impose any special restrictions on the specific form of the vehicle.

[0044] The following takes a hybrid vehicle as an example to introduce the structure of the vehicle. Figure 1 FIG. 1 is a schematic diagram of the structure of a hybrid vehicle provided by an exemplary embodiment of the present application. Figure 1 As shown, the vehicle 1 includes a vehicle body 10 , wheels 11 and a hybrid device 12 . The hybrid device 12 is mounted on the vehicle body 10 and is in transmission connection with the wheels 11 . The hybrid device 12 can drive the wheels 11 to rotate.

[0045] The following further introduces Figure 1 The composition of the hybrid device 12 is, for example, Figure 2 An exemplary embodiment of the present application is shown. Figure 1Schematic diagram of the structure of the hybrid device 12. Figure 2 As shown, the hybrid device 12 includes a battery, a generator, and an electric motor.

[0046] The following will further introduce Figure 2 The composition of the engine. For example, Figure 3 An exemplary embodiment of the present application is shown. Figure 2 The schematic diagram of the structure of the engine. Figure 3 As shown, the engine includes a cylinder head, an intake system, cylinders, injectors, a combustion chamber, pistons, connecting rods, a crankcase, a crankshaft ventilation system, and an exhaust system.

[0047] The cylinder is the heart of the engine and is where the fuel combustion process takes place.

[0048] The cylinder head is the component on top of the engine. It is used to seal the top of the cylinder to prevent gas leakage. The cylinder head usually contains components such as the intake valve and exhaust valve.

[0049] The intake system is connected to the cylinder and is used to provide clean and sufficient air or combustible mixture to the cylinder of the engine.

[0050] The intake system is connected to the crankshaft ventilation system and is used to process the gas in the crankcase to prevent the crankcase pressure from being too high.

[0051] The fuel injector is usually installed on the cylinder head, with its nozzle directly aimed at the combustion chamber. Its main function is to spray the fuel into the combustion chamber in the form of atomization.

[0052] The combustion chamber is the space at the top of the cylinder where the fuel and air mix and burn.

[0053] The piston moves up and down in the cylinder, converting the heat energy generated by combustion into mechanical energy, and transferring the energy generated by combustion to the crankshaft through the connecting rod.

[0054] The connecting rod is used to connect the piston to the crankshaft and is responsible for converting the piston's linear motion into rotational motion.

[0055] The crankcase is the part at the bottom of the engine that houses the crankshaft and lubricating oil.

[0056] The crankshaft is the power output component of the engine, which is used to convert the movement of the connecting rod into rotational motion and ultimately drive the vehicle.

[0057] The crankcase ventilation system is used to treat the gases that enter the crankcase when the engine is running, including unburned fuel, water vapor and exhaust gas.

[0058] The exhaust system is used to discharge the exhaust gas after combustion from the engine.

[0059] Vehicle 1 can use ethanol as fuel. The combustion products of ethanol are primarily water and carbon dioxide. The post-combustion water and unburned ethanol can enter the crankcase through the gap between the piston and cylinder, where they mix with the engine oil. When the engine is warm, the water vapor entering the crankcase exists in gaseous form. As the engine rests, the crankcase temperature drops, causing the water vapor to condense into liquid water, which mixes with the engine oil, resulting in oil emulsification. Emulsified oil has poor fluidity, making it difficult to form an effective oil film on the surfaces of crankcase components. The oil film is crucial for reducing direct contact between components. If the oil film fails to form, friction between components increases, leading to increased wear and tear, which can easily damage the engine and reduce the user experience.

[0060] In order to solve the above technical problems, vehicle 1 can determine the cumulative fuel injection amount of the engine of vehicle 1 within a period of time, and the cumulative fuel injection amount is the total amount of ethanol fuel injected into the engine combustion chamber by the engine injector during the aforementioned period of time; then, the reverse dragging time is determined based on the cumulative fuel injection amount; wherein, the reverse dragging time is the time during which the wheels of vehicle 1 reverse drag the engine through the transmission system of vehicle 1, and the reverse dragging time is positively correlated with the cumulative fuel injection amount; then, the wheels are controlled to reverse drag the engine through the transmission system within the reverse dragging time to discharge water vapor in the engine crankcase out of the engine.

[0061] During reverse towing, the pressure of the engine's intake system is lower than atmospheric pressure. The negative pressure of the intake system will be transmitted to the crankcase ventilation system, causing negative pressure in the crankcase ventilation system. The crankcase ventilation system has a lower pressure than the area where the engine oil is located. This pressure difference will drive the gas from the area with higher pressure to the area with lower pressure. This will help the water vapor in the engine crankcase to be discharged to the crankcase ventilation system, which can minimize the occurrence of oil emulsification.

[0062] An embodiment of the present application provides a vehicle 1 control method, which controls the wheels to reversely drag the engine through the transmission system within the reverse drag time, and can maintain the negative pressure state generated by the crankcase ventilation system for a certain period of time, so that the water vapor in the engine crankcase is discharged to the crankcase ventilation system within a certain period of time, and the water vapor is discharged from the engine through the exhaust system, so as to discharge the water vapor in the engine crankcase from the engine as much as possible, reduce the emulsification degree of the engine oil, and further reduce the wear degree of the engine, thereby improving the user experience.

[0063] It should be understood that the above application scenario examples are only provided to facilitate understanding of the spirit and principles of the present application, and the embodiments of the present application are not limited thereto. On the contrary, the embodiments of the present application can be applied to any applicable scenario.

[0064] Exemplary Methods

[0065] Figure 4Shown is a flow chart of a vehicle control method provided by an exemplary embodiment of the present application. Figure 4 The method may be performed by a vehicle, such as Figure 1 Vehicle 1 in the execution. Figure 4 As shown, the vehicle control method may include the following contents:

[0066] 410: A shutdown command is detected, and the cumulative fuel injection amount of the vehicle engine in a preset time period is determined.

[0067] The stop command instructs the engine to stop burning fuel. Upon detecting the stop command, the vehicle stops the spark plugs from sparking and stops the fuel injectors from injecting fuel into the cylinders.

[0068] In one example, the shutdown instruction may be issued by an electronic control unit (ECU) of the vehicle, and detecting the shutdown instruction includes: detecting that the ECU of the vehicle issues a shutdown instruction to the engine.

[0069] The cumulative fuel injection amount is the total amount of fuel injected into the combustion chamber of the engine by the engine's injector during a preset time period.

[0070] In the embodiments of the present application, the fuel may be ethanol fuel, which may be an ethanol blended fuel or a fuel containing only ethanol. An ethanol blended fuel is a mixture of ethanol and other fuels, such as gasoline. It should be understood that the fuel in the embodiments of the present application is not limited to ethanol fuel; any fuel that will introduce water vapor into the engine oil after combustion may be used.

[0071] Before the stop command is detected, the vehicle is in a driving state. Specifically, the vehicle can be in a driving state under user operation. For example, when the vehicle responds to user operation, such as inserting the key into the keyhole and turning it to the "ON" position, the vehicle's key door is powered on. The key door power-on provides power to the vehicle's electronic control unit, and the ECU receives power and starts working; after the key door is powered on, when the vehicle responds to user operation, such as turning the key to the "START" position, the ECU controls the engine to start. Engine start refers to the process from a stationary state to the engine starting to run. When the engine starts, the engine burns fuel; when the vehicle responds to user operation, such as lightly pressing the accelerator pedal, the engine speed is greater than zero and begins to rise, entering the driving state. This process enables the vehicle to go from a stationary state to a driving state.

[0072] 420: Determine a reverse dragging time based on the accumulated fuel injection amount; wherein the reverse dragging time is the time it takes for the vehicle's wheels to reversely drag the engine through the vehicle's transmission system, and the reverse dragging time is positively correlated with the accumulated fuel injection amount.

[0073] The transmission system generally consists of a clutch, transmission, universal joint, final drive, differential, and axles. The transmission system transfers engine power to the vehicle's wheels, enabling it to travel at a certain speed. The wheels can also use the transmission system to pull the engine backward.

[0074] It's understandable that the law of engine operation states that the weight of fuel consumed in a single engine cycle, i.e., the cumulative fuel injection volume, determines the amount of water vapor entering the crankcase after combustion. In other words, by calculating the cumulative fuel injection volume of a single engine cycle, the amount of water vapor retained in the crankcase can be calculated. Furthermore, the greater the cumulative fuel injection volume, the greater the amount of water vapor retained in the crankcase. Therefore, it can be seen that the cumulative fuel injection volume and the amount of water vapor retained in the crankcase are also positively correlated. As long as the positive correlation between the cumulative fuel injection volume and the reverse drag duration is determined, the reverse drag duration required to expel the water vapor retained in the crankcase can also be indirectly determined.

[0075] Positive correlation means that the two variables, drag duration and cumulative fuel injection volume, change in the same direction or trend. When one variable (e.g., drag duration) changes from large to small or from small to large, the other variable (e.g., cumulative fuel injection volume) also changes from large to small or from small to large. In other words, in a positive correlation, one variable (e.g., drag duration) changes in the same direction as the other variable (e.g., cumulative fuel injection volume) (both variables increase or decrease simultaneously).

[0076] 430: Control the wheels to reverse the engine through the transmission system within the reverse drag time to discharge the water vapor in the engine crankcase out of the engine.

[0077] Understandably, after the engine stops burning fuel, the engine speed generally doesn't immediately return to zero. This is because the vehicle's wheels may generate kinetic energy due to inertia, which drives the engine. As the kinetic energy generated by the wheels' inertia gradually dissipates, the engine speed gradually decreases until it reaches zero.

[0078] An embodiment of the present application provides a vehicle control method, which controls the wheels to reversely drag the engine through the transmission system within the reverse drag time, and can maintain the negative pressure state generated by the crankcase ventilation system for a certain period of time, so that the water vapor in the engine crankcase is discharged to the crankcase ventilation system within a certain period of time, and the water vapor is discharged from the engine through the exhaust system, so as to discharge the water vapor in the engine crankcase from the engine as much as possible, and prevent the water vapor from condensing into liquid and entering the oil pan to dilute the engine oil after the engine stops. In this way, the emulsification degree of the engine oil can be reduced, thereby reducing the wear degree of the engine and improving the user experience.

[0079] According to one embodiment of the present application, controlling the wheels to reversely drag the engine through the transmission system within the reverse dragging time includes: in the process of the wheels reversely dragging the engine through the transmission system, if it is detected that the current time is the end time of the reverse dragging time, then sending a disconnection electrical signal to the clutch in the transmission system through the vehicle's electronic control unit to disconnect the transmission connection relationship between the engine and the wheels.

[0080] In one example, when a vehicle detects a stop command, the vehicle's engine stops burning fuel. If the transmission connection between the engine and the wheels is not disconnected at this time, the engine will be dragged backward by the inertia of the wheels, slowing down the vehicle forward. During the process of the wheels dragging the engine backward through the transmission system, if it is detected that the current time is the end of the reverse dragging time, the vehicle's electronic control unit sends a disconnection signal to the clutch in the transmission system to disconnect the transmission connection between the engine and the wheels.

[0081] In another example, the vehicle detects a stop command. If the transmission connection between the engine and the wheels is disconnected at this time, a connection electrical signal is sent to the clutch in the transmission system through the vehicle's electronic control unit to connect the transmission connection between the engine and the wheels, thereby allowing the wheels to reversely drag the engine through the transmission system; in the process of the wheels reversely dragging the engine through the transmission system, if it is detected that the current time is the end time of the reverse dragging time, a disconnection electrical signal is sent to the clutch in the transmission system through the vehicle's electronic control unit to disconnect the transmission connection between the engine and the wheels.

[0082] In the embodiment of the present application, the electronic control unit in the vehicle can more accurately control the reverse towing time, which can improve the efficiency of reducing the emulsification degree of the engine oil to a certain extent.

[0083] According to an embodiment of the present application, determining the reverse drag time based on the cumulative fuel injection amount includes: determining the reverse drag time from a preset mapping relationship based on the cumulative fuel injection amount; wherein the preset mapping relationship is a correspondence between the cumulative fuel injection amount and the reverse drag time.

[0084] In the embodiment of the present application, the preset mapping relationship is the correspondence between the cumulative injection amount and the reverse drag length. In this way, based on the preset mapping relationship, the reverse drag length can be determined more accurately to discharge all the water vapor in the engine crankcase from the engine as much as possible, thereby reducing the emulsification degree of the engine oil, thereby reducing the degree of engine wear and improving the user experience.

[0085] According to one embodiment of the present application, the reverse drag time is determined from a preset mapping relationship based on the cumulative fuel injection amount, including: obtaining the reverse drag time based on a preset coefficient and the cumulative fuel injection amount; wherein the preset coefficient is used to characterize the reverse drag time corresponding to the cumulative fuel injection amount per unit mass.

[0086] The unit of mass can be determined according to actual conditions. For example, the unit of mass can be milligrams, but is not limited to milligrams.

[0087] The unit of the reverse drag time may also be determined according to actual conditions. For example, the unit of the reverse drag time is seconds, but the present invention is not limited thereto.

[0088] Unit mass refers to the ratio of the cumulative fuel injection amount to the reverse drag time, given the same mass unit. For example, if the unit of mass is milligrams and the unit of reverse drag time is seconds, this is the ratio of the cumulative fuel injection amount to the reverse drag time.

[0089] During the engine development phase, testing equipment can test vehicles to obtain multiple sets of test data. Each set of test data includes the cumulative fuel injection volume and the corresponding reverse drag duration. The testing equipment then performs data fitting on these multiple sets of test data to obtain a fitting formula. The coefficients in this reverse drag duration calculation formula are pre-determined coefficients obtained through testing and can be referred to as preset coefficients. The testing equipment can then determine the coefficients in the fitting formula as the preset coefficients.

[0090] The following is an example of the process for determining the preset coefficient. After the engine is started, the cumulative fuel injection volume of a single engine cycle is calculated. The engine's reverse cranking time required to completely expel the accumulated water vapor in the crankcase corresponding to the cumulative fuel injection volume in a single engine cycle is tested, and a corresponding reverse cranking table is developed. The reverse cranking table includes multiple sets of test data, each set of test data including a one-to-one correspondence between the cumulative fuel injection volume in a single engine cycle and the engine's reverse cranking time required to completely expel the accumulated water vapor in the crankcase.

[0091] The following is an example of a reverse drag table, as shown in Table 1:

[0092] Table 1

[0093]

[0094]

[0095] According to Table 1, if the cumulative fuel injection amount is 100 mg, the reverse drag time is 5 seconds; if the cumulative fuel injection amount is 200 mg, the reverse drag time is 10 seconds; if the cumulative fuel injection amount is 300 mg, the reverse drag time is 15 seconds; and if the cumulative fuel injection amount is 400 mg, the reverse drag time is 20 seconds. It will be understood that the above four sets of specific data are only examples and do not include only four sets of data. The reverse drag table can include multiple sets of data.

[0096] The test equipment can fit a formula based on multiple sets of test data, and determine the coefficients in the formula as preset coefficients. The formula can be a straight line formula or a curve formula. For example, the formula based on the multiple sets of data in Table 1 above can be:

[0097] T=0.05*h

[0098] Where T represents the reverse drag time in seconds, a represents the preset coefficient, and h represents the mass of the accumulated fuel injection in milligrams. The test equipment can determine 0.05 as the preset coefficient.

[0099] In the embodiment of the present application, a more accurate reverse drag duration can be obtained by using a preset coefficient, so as to discharge as much water vapor in the engine crankcase as possible from the engine, thereby reducing the emulsification degree of the engine oil, thereby reducing the wear degree of the engine and improving the user experience.

[0100] According to an embodiment of the present application, the reverse dragging time is determined from a preset mapping relationship based on the cumulative fuel injection amount, including: obtaining the reverse dragging time from a preset reverse dragging time table based on the cumulative fuel injection amount; wherein the preset reverse dragging time table includes a correspondence between the mass range of the cumulative fuel injection and the reverse dragging time.

[0101] After determining the correspondence between the cumulative fuel injection volume for a single cycle and the engine's reverse run time required to completely expel accumulated water vapor in the crankcase through the aforementioned test, this correspondence can be converted into a preset reverse run time table of cumulative fuel injection volume and reverse run time. The preset reverse run time table includes the correspondence between cumulative fuel injection mass ranges and reverse run time. In this way, the vehicle can calculate the cumulative fuel injection volume for a single engine cycle, query the preset reverse run time table based on the cumulative fuel injection volume for a single engine cycle to determine the corresponding cumulative fuel injection mass range, and then find the reverse run time corresponding to the cumulative fuel injection mass range.

[0102] For example, the preset reverse drag time table of the cumulative fuel injection amount and the reverse drag time may be shown in Table 2:

[0103] Table 2

[0104]

[0105] According to Table 2, if the cumulative fuel injection amount is any value between 0 and 100 mg, excluding 0, the reverse drag time is 5 seconds; if the cumulative fuel injection amount is any value between 100 mg and 200 mg, excluding 100 mg, the reverse drag time is 10 seconds; if the cumulative fuel injection amount is any value between 200 mg and 300 mg, excluding 200 mg, the reverse drag time is 15 seconds; if the cumulative fuel injection amount is between 300 mg and 400 mg, excluding 300 mg, the reverse drag time is 20 seconds. It will be understood that the above four sets of specific data are only examples and do not include only four sets of data. The reverse drag table may include multiple sets of data.

[0106] For example, if the vehicle calculates that the cumulative fuel injection amount of a single engine cycle is 150 mg, based on the cumulative fuel injection amount of 150 mg, the corresponding cumulative fuel injection mass range is queried from Table 1 as 100 mg to 200 mg, and then the reverse drag time corresponding to the cumulative fuel injection mass range is found to be 10 seconds.

[0107] For example, if the vehicle calculates the cumulative fuel injection volume of a single engine cycle to be 250 mg, based on the cumulative fuel injection volume of 250 mg, the corresponding cumulative fuel injection mass range is found from Table 1 to be 200 mg to 300 mg, and then the reverse drag time corresponding to this cumulative fuel injection mass range is found to be 15 seconds.

[0108] For example, if the vehicle calculates the cumulative fuel injection volume of a single engine cycle to be 350 mg, based on the cumulative fuel injection volume of 350 mg, the corresponding cumulative fuel injection mass range is found from Table 1 to be 300 mg to 400 mg, and then the reverse drag time corresponding to this cumulative fuel injection mass range is found to be 20 seconds.

[0109] It can be understood that, in one example, the above-mentioned preset coefficients and preset reverse dragging time table can be determined at a preset reverse dragging speed, that is, the data used to determine the above-mentioned preset coefficients and preset reverse dragging time table (such as the reverse dragging time data in the above-mentioned Table 2) are determined at a preset reverse dragging speed, and the preset reverse dragging speed is less than the reverse dragging speed when the vehicle detects a stop command. In this way, when the reverse dragging speed of the vehicle when it detects a stop command is greater than or equal to the preset reverse dragging speed, the reverse dragging time is still determined according to the above-mentioned preset mapping relationship, and the vehicle is controlled to be in a state of controlling the wheels to reversely drag the engine through the transmission system within this reverse dragging time. This can completely discharge the water vapor in the crankcase from the engine to a certain extent, thereby reducing the degree of oil emulsification, thereby reducing the degree of engine wear, and improving the user experience.

[0110] In the embodiment of the present application, the target reverse dragging time can be quickly found through the pre-stored preset reverse dragging time table, thereby improving the speed of determining the reverse dragging time.

[0111] According to an embodiment of the present application, the preset time period is a time period from when the engine is started to when the engine is stopped.

[0112] In one example, the preset time period may be the time period between engine start and engine stop, that is, the preset time period may be the entire time period between engine start and engine stop. This time period may be referred to as a single engine cycle.

[0113] In another example, the preset time period may be a portion of the time period between engine start and engine stop. That is, the preset time period may be a portion of the time period between engine start and engine stop, and the portion of the time period may be continuous. For example, if the time period between engine start and engine stop is 2 hours, the preset time period may be the time period between 2 minutes after engine start and 2 minutes before engine stop, which is 1 hour and 46 minutes.

[0114] In an embodiment of the present application, by calculating the cumulative fuel injection amount from the time the engine is started to the time it is stopped, a more accurate cumulative fuel injection amount can be obtained, and then a more accurate reverse drag duration can be obtained, so as to discharge all the water vapor in the engine crankcase from the engine as much as possible, thereby reducing the degree of oil emulsification, and then reducing the degree of engine wear, thereby improving user experience.

[0115] According to an embodiment of the present application, controlling the wheels to reversely drag the engine through the transmission system within the reverse drag time includes: when detecting that the vehicle is driving downhill, controlling the wheels to reversely drag the engine through the transmission system within the reverse drag time.

[0116] The downhill driving state of a vehicle refers to the situation where the vehicle is driving down a slope under the action of gravity. This state can be detected by the vehicle's acceleration sensor, slope sensor or vehicle dynamics model.

[0117] In one example, when it is detected that the vehicle is traveling downhill, regardless of whether the brake pedal of the vehicle is depressed or not, the wheels can be controlled to reverse the engine through the transmission system within the reverse drag time.

[0118] In the embodiment of the present application, when the vehicle is traveling downhill, the vehicle is affected by gravity and the vehicle is sliding downhill at a high speed. The wheels have sufficient speed to reversely pull the engine to expel as much moisture as possible from the engine crankcase, thereby reducing the degree of oil emulsification and, in turn, reducing engine wear. Furthermore, when the wheels have sufficient speed to reversely pull the engine, the vehicle's own energy (e.g., electricity) is not consumed, thus saving vehicle energy while reducing engine wear and improving the user experience.

[0119] According to an embodiment of the present application, controlling the wheels to reversely drag the engine through the transmission system within the reverse dragging time includes: when detecting that the vehicle's brake pedal is depressed, controlling the wheels to reversely drag the engine through the transmission system within the reverse dragging time.

[0120] In one example, when it is detected that the brake pedal of the vehicle is depressed, a connection electrical signal is sent to the clutch in the transmission system through the vehicle's electronic control unit to connect the transmission connection between the engine and the wheels, thereby allowing the wheels to reversely drag the engine through the transmission system; in the process of the wheels reversely dragging the engine through the transmission system, if it is detected that the current time is the time when the reverse dragging time ends, a disconnection electrical signal is sent to the clutch in the transmission system through the vehicle's electronic control unit to disconnect the transmission connection between the engine and the wheels.

[0121] In an embodiment of the present application, when it is detected that the vehicle's brake pedal is depressed, the vehicle will slowly decelerate. The vehicle originally has a certain speed, and due to inertia, the wheels can drag the engine in reverse, so there is no need to consume the vehicle's own energy (such as electrical energy). While saving vehicle energy, it reduces the wear of the engine and improves the user experience.

[0122] Figure 5 Shown is a flow chart of a vehicle control method provided by another exemplary embodiment of the present application. Figure 5 The method may be performed by a vehicle, such as Figure 1 Vehicle 1 in the execution. Figure 5 The embodiment is Figure 4 For the example of embodiment, in order to avoid repetition, the same points can be referred to the description in the above embodiment, which will not be repeated here. Figure 5 As shown, the vehicle control method may include the following steps.

[0123] 510: A shutdown command is detected, and the cumulative fuel injection amount of the vehicle engine in a preset time period is determined.

[0124] 520: Obtaining a reverse drag time based on a preset coefficient and the cumulative fuel injection amount; wherein the preset coefficient is used to represent the reverse drag time corresponding to the cumulative fuel injection amount per unit mass.

[0125] 530: Control the wheels to reverse the engine through the transmission system within the reverse drag time to discharge the water vapor in the engine crankcase out of the engine.

[0126] Exemplary devices

[0127] Figure 6 The figure shows a schematic diagram of the structure of a vehicle control device provided by an exemplary embodiment of the present application. Figure 6 As shown, the vehicle control device 600 includes: a first determination module 601 , a second determination module 602 and a control module 603 .

[0128] The first determination module 601 is used to detect a shutdown instruction and determine the cumulative fuel injection amount of the vehicle's engine in a preset time period; wherein the shutdown instruction is used to instruct the engine to stop burning fuel; the cumulative fuel injection amount is the total amount of fuel injected into the engine's combustion chamber by the engine's injector in a preset time period; the second determination module 602 is used to determine the reverse dragging time based on the cumulative fuel injection amount; wherein the reverse dragging time is the time the vehicle's wheels reverse drag the engine through the vehicle's transmission system, and the reverse dragging time is positively correlated with the cumulative fuel injection amount; the control module 603 is used to control the wheels to reverse drag the engine through the transmission system within the reverse dragging time to discharge water vapor in the engine crankcase out of the engine.

[0129] The embodiment of the present application provides a vehicle control device. By controlling the wheels to drag the engine backward through the transmission system during the backward dragging time, the negative pressure state generated by the crankcase ventilation system can be maintained for a certain period of time, so that the water vapor in the engine crankcase is discharged to the crankcase ventilation system within a certain period of time, and the water vapor in the engine crankcase is discharged from the engine as much as possible to prevent the water vapor from condensed into liquid and enter the oil pan after the engine is shut down, causing the engine oil to dilute. In this way, the degree of emulsification of the engine can be reduced, thereby reducing the degree of wear of the engine and improving the user experience.

[0130] According to one embodiment of the present application, controlling the wheels to reversely drag the engine through the transmission system within the reverse dragging time includes: in the process of the wheels reversely dragging the engine through the transmission system, if it is detected that the current time is the end time of the reverse dragging time, then sending a disconnection electrical signal to the clutch in the transmission system through the vehicle's electronic control unit to disconnect the transmission connection relationship between the engine and the wheels.

[0131] According to an embodiment of the present application, the second determination module 602 is configured to determine the reverse drag duration from a preset mapping relationship based on the cumulative fuel injection amount; wherein the preset mapping relationship is a correspondence between the cumulative fuel injection amount and the reverse drag duration.

[0132] According to an embodiment of the present application, the second determination module 602 is used to obtain the reverse drag time based on a preset coefficient and the cumulative fuel injection amount; wherein the preset coefficient is used to represent the reverse drag time corresponding to the cumulative fuel injection amount per unit mass.

[0133] According to an embodiment of the present application, the second determination module 602 is used to obtain the reverse drag duration from a preset reverse drag duration table based on the cumulative fuel injection amount; wherein the preset reverse drag duration table includes a correspondence between the mass range of the cumulative fuel injection and the reverse drag duration.

[0134] According to an embodiment of the present application, the preset time period is a time period from when the engine is started to when the engine is stopped.

[0135] According to an embodiment of the present application, the control module 603 is used to control the wheels to reversely drag the engine through the transmission system within the reverse drag time when it is detected that the vehicle is in a downhill driving state.

[0136] According to an embodiment of the present application, the control module 603 is used to control the wheels to reverse the engine through the transmission system within the reverse drag time when it is detected that the brake pedal of the vehicle is depressed.

[0137] It should be understood that the operations and functions of the first determination module 601, the second determination module 602 and the control module 603 in the above embodiment can refer to the above Figure 4 To avoid repetition, the description of the vehicle control method provided in the embodiment will not be repeated here.

[0138] Figure 7 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application.

[0139] For example, Figure 7 As shown, the vehicle 700 may include a memory 701 and a processor 702. The memory 701 stores executable program code 7011, and the processor 702 is configured to call and execute the executable program code 7011 to perform the vehicle control method provided by the embodiment of the present application. The processor 702 may be part of an ECU in the vehicle.

[0140] This embodiment can divide the vehicle into functional modules based on the above-described method example. For example, each functional module can be mapped to a specific function, or two or more functions can be integrated into a single processing module. The integrated module can be implemented in hardware. It should be noted that the module division in this embodiment is illustrative and represents only one logical functional division. In actual implementation, other division methods may be used.

[0141] In the case of dividing the functional modules into corresponding functional modules, the vehicle may include: a first determination module 601, a second determination module 602, and a control module 603. It should be noted that all relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module and will not be repeated here.

[0142] The vehicle provided in this embodiment is used to execute the above-mentioned vehicle control method, and thus can achieve the same effect as the above-mentioned implementation method.

[0143] This embodiment also provides a computer-readable storage medium, which stores computer program code (including but not limited to disk storage, CD-ROM, optical storage, etc.). When the computer program code runs on a computer, the computer executes the above-mentioned related method steps to implement a vehicle control method provided by the above-mentioned embodiment.

[0144] This embodiment also provides a computer program product. When the computer program product is run on a computer, it enables the computer to execute the above-mentioned related steps to implement a vehicle control method provided by the above embodiment.

[0145] Among them, the beneficial effects of the above embodiments can refer to the beneficial effects of the corresponding methods provided above, and will not be repeated here.

[0146] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0147] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0148] In the description of this application, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "left" and "right" are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the positions or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present application. It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. It should also be noted that the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, product or device comprising 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, product or device. Without further limitation, the elements defined by the phrase "comprising a..." do not exclude the presence of other identical elements in the process, method, product or device comprising the elements.

[0149] The above are merely embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A vehicle control method, characterized in that: include: detecting a shutdown command, and determining a cumulative fuel injection amount of the engine of the vehicle during a preset time period; wherein the shutdown command is used to instruct the engine to stop burning fuel; and the cumulative fuel injection amount is the total amount of fuel injected into the combustion chamber of the engine by the injector of the engine during the preset time period; Determining a reverse dragging time based on the cumulative fuel injection amount; wherein the reverse dragging time is a time duration during which the vehicle's wheels reversely drag the engine via the vehicle's transmission system, and the reverse dragging time is positively correlated with the cumulative fuel injection amount; The wheels are controlled to reversely drag the engine through the transmission system within the reverse drag time, so as to discharge water vapor in the engine crankcase out of the engine.

2. The vehicle control method according to claim 1, characterized in that: Controlling the wheels to reversely drag the engine through the transmission system within the reverse drag time includes: During the process of the wheels reversely dragging the engine through the transmission system, if it is detected that the current time is the end time of the reverse dragging period, a disconnection electrical signal is sent to the clutch in the transmission system through the electronic control unit of the vehicle to disconnect the transmission connection between the engine and the wheels.

3. The vehicle control method according to claim 1 or 2, characterized in that: The determining of the reverse drag duration based on the accumulated fuel injection amount includes: The reverse drag duration is determined from a preset mapping relationship based on the cumulative fuel injection amount; wherein the preset mapping relationship is a correspondence between the cumulative fuel injection amount and the reverse drag duration.

4. The vehicle control method according to claim 3, characterized in that: The determining of the reverse drag duration from a preset mapping relationship based on the cumulative fuel injection amount includes: The reverse drag time is obtained based on a preset coefficient and the cumulative fuel injection amount; wherein the preset coefficient is used to represent the reverse drag time corresponding to the cumulative fuel injection amount per unit mass.

5. The vehicle control method according to claim 3, characterized in that: The determining of the reverse drag duration from a preset mapping relationship based on the cumulative fuel injection amount includes: The reverse drag time is obtained from a preset reverse drag time table based on the cumulative fuel injection amount; wherein the preset reverse drag time table includes a correspondence between a mass range of cumulative fuel injection and a reverse drag time.

6. The vehicle control method according to claim 1, characterized in that: The preset time period is a time period from when the engine is started to when the engine is stopped.

7. The vehicle control method according to claim 1, characterized in that: The controlling the wheels to reversely drag the engine through the transmission system within the reverse dragging time period includes: when it is detected that the vehicle is traveling downhill, controlling the wheels to reversely drag the engine through the transmission system within the reverse dragging time period.

8. The vehicle control method according to claim 1, wherein: The controlling the wheels to reversely drag the engine through the transmission system within the reverse dragging time period includes: controlling the wheels to reversely drag the engine through the transmission system within the reverse dragging time period when it is detected that the brake pedal of the vehicle is depressed.

9. A vehicle, characterized in that: include: The vehicle includes a processor configured to execute the vehicle control method according to any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that The storage medium stores a computer program for executing the vehicle control method according to any one of claims 1 to 8.

Images