Engine shutdown control method, device and equipment and storage medium

Abstract

The invention discloses an engine shutdown control method, device and equipment and a storage medium, and relates to the technical field of vehicle control. The engine shutdown control method comprises the steps that operation condition parameters of a vehicle engine are obtained; the shutdown condition of the engine is judged according to the operation condition parameters; when it is detected that the engine enters the shutdown working condition, a throttle valve of the engine is driven to be opened; and after the throttle valve is opened, the amount of low-temperature air entering the air cylinder from the air inlet manifold through the throttle valve is controlled. The throttle valve is controlled to be actively opened when the engine stops, so that external low-temperature gas can enter an engine cylinder, and meanwhile, the scavenging effect of fresh low-temperature gas on a combustion chamber is enhanced by utilizing the characteristic that a supercharger still rotates at a high speed due to inertia at the stop moment, so that high-temperature gas in the combustion chamber is quickly swept out; and the temperature of the combustion chamber is prevented from returning when the engine stops.

Description

Technical Field

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

[0002] After the engine has been running at full load for a period of time, the temperature of the engine combustion chamber reaches the highest. At this time, the engine cooling system runs at full speed, and the cooling water in the water jacket around the cylinder liner continuously circulates to take away the heat from the engine combustion chamber and piston, etc., to ensure that the temperature of these parts does not exceed the standard. At this time, the engine cooling system's large circulation and cooling fan are turned on to ensure that the heat taken away from the combustion chamber by the coolant is dissipated into the air through the radiator and cooling fan.

[0003] If the engine suddenly stops at this time, the engine cooling system will also stop working. Due to the high temperature of the combustion exhaust gas, the temperature of the engine combustion chamber will further increase. If the temperature exceeds the allowable temperature of the cylinder head material and piston material, it will cause deformation of the cylinder head and damage to the piston.

[0004] The above contents are only used to assist in understanding the technical solution of the present application and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The main purpose of the present application is to provide an engine shutdown control method, device, equipment and storage medium, aiming to solve the technical problem in the prior art that sudden shutdown of the engine causes the combustion chamber to be unable to cool down quickly, resulting in hardware damage.

[0006] To achieve the above objectives, the present application proposes an engine shutdown control method, the engine shutdown control method comprising:

[0007] Obtaining operating condition parameters of the vehicle engine;

[0008] Determining a shutdown state of the engine according to the operating condition parameters;

[0009] When it is detected that the engine enters a shutdown state, the throttle valve of the driving engine is opened;

[0010] After the throttle valve is opened, the amount of low-temperature air entering the cylinder from the intake manifold through the throttle valve is controlled.

[0011] In one embodiment, the step of driving the throttle of the engine to open when detecting that the engine enters a shutdown condition comprises:

[0012] When an engine shutdown signal is detected, the engine speed is adjusted to a preset shutdown speed, and it is determined that the engine will enter a shutdown condition, and the throttle of the engine is driven to open;

[0013] The step of controlling the amount of low-temperature air entering the cylinder through the intake manifold through the throttle valve after the throttle valve is opened comprises:

[0014] After the throttle valve is opened, setting the overlap angle of the intake valve and the exhaust valve to a preset cooling overlap angle;

[0015] Obtaining the number of overlaps between the intake valve and the exhaust valve according to the number of crankshaft rotations and the preset cooling overlap angle;

[0016] The amount of low-temperature air entering the cylinder from the intake manifold through the throttle valve is controlled according to the overlap number and the preset cooling overlap angle.

[0017] In one embodiment, the step of setting the overlap angle of the intake valve and the exhaust valve to a preset cooling overlap angle comprises:

[0018] Obtaining a preset valve overlap angle, a VVT intake advance angle, and an exhaust delay angle of a camshaft in the engine;

[0019] The preset cooling overlap angle is set according to the preset valve overlap angle, the VVT ​​intake advance angle and the exhaust delay angle.

[0020] In one embodiment, before the step of obtaining the number of overlaps between the intake valve and the exhaust valve according to the number of crankshaft rotations and the preset cooling overlap angle, the step further includes:

[0021] Obtaining the number of cylinders and engine stroke of the engine;

[0022] The step of obtaining the overlap times of the intake valve and the exhaust valve according to the crankshaft rotation times and the preset cooling overlap angle comprises:

[0023] The number of overlaps between the intake valve and the exhaust valve is obtained according to the number of cylinders, the number of engine strokes and the number of crankshaft rotations.

[0024] In one embodiment, after the step of obtaining the number of overlaps between the intake valve and the exhaust valve according to the number of cylinders, the number of engine strokes and the number of crankshaft rotations, the following steps are included:

[0025] Get the stroke status of each cylinder;

[0026] Opening the intake valve of the cylinder in the intake stroke;

[0027] Opening the exhaust valve of the cylinder in the exhaust stroke;

[0028] The opening sequence of the intake valve and the exhaust valve of each cylinder is controlled in sequence according to the overlap number, and the intake valve opening advance angle and the exhaust valve closing delay angle are controlled according to the preset cooling overlap angle.

[0029] In one embodiment, after the throttle valve is opened, the step of controlling the low-temperature air to enter the cylinder through the intake manifold through the throttle valve comprises:

[0030] After the throttle valve is opened, the supercharger is driven to pressurize the external low-temperature air;

[0031] The supercharged low-temperature air is controlled to enter the cylinder from the intake manifold through the throttle valve.

[0032] In one embodiment, after the step of controlling the supercharged low-temperature air to enter the cylinder through the throttle valve from the intake manifold, the method further includes:

[0033] driving the throttle valve to gradually close, and controlling the pressure relief valve to open at the same time;

[0034] The low-temperature air after being pressurized is controlled to be discharged to the outside through the pressure relief valve.

[0035] In addition, to achieve the above-mentioned purpose, the present application also proposes an engine shutdown control device, the engine shutdown control device comprising:

[0036] An information acquisition module, used to obtain operating parameters of the vehicle engine;

[0037] A working condition judgment module, used for judging the shutdown condition of the engine according to the operating condition parameters;

[0038] A drive control module, used to drive the throttle valve of the engine to open when detecting that the engine enters a shutdown condition;

[0039] The drive control module is also used to control the amount of low-temperature air entering the cylinder through the intake manifold through the throttle valve after the throttle valve is opened.

[0040] In addition, to achieve the above-mentioned purpose, the present application also proposes an engine shutdown control device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the engine shutdown control method as described above.

[0041] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by the processor, the steps of the engine shutdown control method described above are implemented.

[0042] The present application provides an engine shutdown control method, which first obtains the operating condition parameters of the vehicle engine; determines the shutdown status of the engine according to the operating condition parameters; drives the throttle of the engine to open when the engine is detected to enter the shutdown condition; after the throttle is opened, controls the low-temperature air to enter the cylinder through the intake manifold through the throttle. By actively opening the throttle when the engine is shut down, the external low-temperature gas can still enter the engine cylinder, and at the same time, the scavenging effect of the fresh low-temperature gas on the combustion chamber is enhanced by utilizing the characteristic that the supercharger still rotates at high speed due to inertia at the moment of shutdown, so that the high-temperature gas in the combustion chamber is quickly swept out to avoid the temperature of the combustion chamber returning to the temperature when the engine is shut down. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0045] Figure 1 This is a flow chart of the first embodiment of the engine shutdown control method of the present application;

[0046] Figure 2 This is a schematic diagram of the structure of the engine intake system in the first embodiment of the engine shutdown control method of the present application;

[0047] Figure 3 A flow chart of the second embodiment of the engine shutdown control method of the present application;

[0048] Figure 4 A flow chart of the third embodiment of the engine shutdown control method of the present application;

[0049] Figure 5 This is a schematic diagram of the module structure of the engine shutdown control device according to an embodiment of the present application;

[0050] Figure 6 Schematic diagram of the structure of the engine shutdown control device of the hardware operating environment involved in the engine shutdown control method in the embodiment of the present application.

[0051] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0052] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0053] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0054] The main solution of the embodiment of the present application is: obtaining the operating condition parameters of the vehicle engine; judging the shutdown condition of the engine according to the operating condition parameters; when detecting that the engine enters the shutdown condition, driving the throttle of the engine to open; after the throttle is opened, controlling the amount of low-temperature air entering the cylinder from the intake manifold through the throttle.

[0055] In the prior art, when the engine suddenly stops, the engine cooling system will also stop working. Due to the high temperature of the combustion exhaust gas, the temperature of the engine combustion chamber will further increase. If the temperature exceeds the allowable temperature of the cylinder head material and the piston material, it will cause deformation of the cylinder head and damage to the piston.

[0056] The present application provides a solution, which controls the throttle to be actively opened when the engine is shut down, so that external low-temperature gas can still enter the engine cylinder. At the same time, the supercharger is still rotating at high speed due to inertia at the moment of shutdown to enhance the scavenging effect of fresh low-temperature gas on the combustion chamber, so that the high-temperature gas in the combustion chamber is quickly swept out, avoiding the temperature of the combustion chamber from rising when the engine is shut down.

[0057] It should be noted that the execution subject of this embodiment can be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an engine shutdown control device capable of realizing the above functions, etc. The following takes the engine shutdown control device as an example to illustrate this embodiment and the following embodiments.

[0058] Based on this, the embodiment of the present application provides an engine shutdown control method, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the engine shutdown control method of the present application.

[0059] In this embodiment, the engine shutdown control method includes steps S10 to S40:

[0060] Step S10: Obtain operating condition parameters of the vehicle engine.

[0061] Step S20: determining the shutdown status of the engine according to the operating condition parameters.

[0062] It should be noted that the operating condition parameters can be operating condition parameters used to determine whether the engine is in an operating state, for example, they can include engine speed parameters, pedal opening parameters, and ignition switch signal parameters. It is also possible to determine whether the shutdown condition has been entered by monitoring the engine shutdown signal. In the shutdown condition, the engine ECU will control the ignition system to stop ignition, the injection system to stop injection, the throttle valve to close, etc. Therefore, it is possible to determine whether the shutdown condition has been entered based on monitoring the shutdown signal or. The number of valve overlaps is guaranteed based on the crankshaft inertia rotation.

[0063] It should be understood that when the engine is stopped, the various functional devices inside the vehicle will also lose power, for example, the engine cooling system will stop working. When the engine is shut down after running at full load, the temperature of the engine combustion chamber is high, and the cooling system suddenly stops from running at full speed. Since the temperature of the combustion exhaust gas is high and cannot be discharged for a while, the temperature of the engine combustion chamber will further increase.

[0064] Step S30: When it is detected that the engine enters a shutdown state, the throttle valve of the driving engine is opened.

[0065] Step S40: After the throttle valve is opened, the amount of low-temperature air entering the cylinder through the intake manifold through the throttle valve is controlled.

[0066] It should be noted that the throttle can be a controllable valve that can control the outside air to enter the engine cylinder. The engine control system (Engine Control Module, ECU) can control the opening and closing of the throttle according to the driving conditions of the vehicle, and can also control the opening of the throttle to control the flow rate of outside air entering the engine cylinder.

[0067] Reference Figure 2 , Figure 2 This is a schematic diagram of the structure of the engine intake system in the first embodiment of the engine shutdown control method of the present application.

[0068] Among them, the external air can enter the engine's intake pipe through the air filter (i.e., air cleaner). The air filter can be a device that can remove particulate impurities in the air to prevent dust and other impurities in the external air from aggravating the wear of parts. A supercharger and an intercooler are set in the intake pipe. The supercharger can increase the density of the air or combustible mixture entering the engine cylinder, thereby improving the charging quality and enhancing the engine's power. The intercooler is located between the supercharger and the engine's intake manifold, and can cool the air compressed by the supercharger to reduce the intake temperature and improve the cooling efficiency of the cylinder.

[0069] Furthermore, an electronic pressure relief valve structure is also arranged in parallel between the front end of the supercharger and the rear end of the intercooler. Since the engine will first return to the idle working state when receiving a shutdown request, the throttle valve in the prior art will be controlled by the ECU to a very small opening or completely closed, while the supercharger is still running at a high speed under inertia. At this time, in order to avoid the high-pressure gas after the supercharger from damaging the throttle valve and the pipeline structure, the electronic pressure relief valve is usually opened to release the high-pressure gas to the outside.

[0070] It should be understood that this solution controls the throttle to maintain a certain opening through the ECU when the engine is detected to enter a shutdown state, so that low-temperature gas can enter the engine's combustion cylinder and discharge the high-temperature exhaust gas. At the same time, low-temperature fresh air cools the combustion chamber to prevent the combustion chamber temperature from rising when the engine is shut down.

[0071] In this embodiment, the operating parameters of the vehicle engine are obtained; the shutdown status of the engine is determined according to the operating parameters; when the engine is detected to enter the shutdown status, the throttle of the engine is driven to open; after the throttle is opened, the low-temperature air is controlled to enter the cylinder through the throttle from the intake manifold. By actively opening the throttle when the engine is shut down, the external low-temperature gas can still enter the engine cylinder, and at the same time, the scavenging effect of the fresh low-temperature gas on the combustion chamber is enhanced by utilizing the characteristic that the supercharger still rotates at a high speed due to inertia at the moment of shutdown, so that the high-temperature gas in the combustion chamber is quickly swept out, and the temperature of the combustion chamber is prevented from returning to the temperature when the engine is shut down.

[0072] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can be referred to the above introduction, and will not be repeated in the following. Figure 3 , Figure 3 A flow chart of the second embodiment of the engine shutdown control method of the present application is provided. In step S30, the engine shutdown control method includes:

[0073] Step S301: When an engine shutdown signal is detected, the engine speed is adjusted to a preset shutdown speed, it is determined that the engine will enter a shutdown condition, and the throttle of the engine is driven to open.

[0074] It should be noted that the preset shutdown speed can be a pre-set time and number of revolutions by inertia after the engine is shut down. Since the hardware structure of the engine will not change, the number of revolutions by inertia after shutdown remains unchanged at the preset shutdown speed. The specific preset shutdown speed can be set according to different vehicle models (for example, it can be set to 1000r / s or 800r / s). The preset shutdown speed can be set according to the number of revolutions by inertia after the engine is shut down when the engine cylinder combustion chamber is cooled to a safe temperature (for example, 8 revolutions), and the time from rotation to stop (0 speed) after the engine is shut down can also be set to rotate for 2 seconds, that is, 8 revolutions (2880°).

[0075] It should be understood that when the engine ECU receives a shutdown signal and determines that the engine is to shut down, for example, the engine speed is 750rpm at this time, in order to ensure a sufficient number of valve overlaps, the shutdown action may not be performed first, but the speed may be increased to a preset shutdown speed (for example, it can be set to 1000r / s or 800r / s) before shutting down, thereby ensuring the number of valve overlaps according to the inertia of the crankshaft.

[0076] At this time, the step S40 further includes:

[0077] Step S302: setting the overlap angle of the intake valve and the exhaust valve to a preset cooling overlap angle.

[0078] It should be noted that the cooling overlap angle can be the crankshaft angle at which the intake valve and the exhaust valve are opened simultaneously when the engine cools the combustion chamber by passing low-temperature air. During the overlap angle, low-temperature air enters the cylinder while high-temperature exhaust gas is discharged, which helps to improve the scavenging efficiency of the engine.

[0079] It should be understood that the size of the cooling overlap angle may depend on the design and performance requirements of the engine. For example, the cooling overlap angle may be calculated based on the preset valve overlap angle, VVT intake advance angle, and exhaust delay angle of the camshaft in the engine. Among them, the preset valve overlap angle is the fixed valve overlap angle (e.g., 20°) of the camshaft of the engine during hardware design, and the VVT ​​intake advance angle may refer to the angle at which the intake valve is opened in advance during the intake stroke (e.g., 60°). The angle adjustment change of the engine variable valve timing system (Variable Valve Timing, VVT) is to provide a certain oil pressure through the engine oil pump to drive the VVT ​​actuator to change the angle, which can adjust the opening time of the intake valve. The exhaust delay angle may be the angle at which the exhaust valve is delayed to close during the exhaust stroke (e.g., 60°). The size of the cooling overlap angle needs to be set to at least the sum of the above-mentioned preset valve overlap angle, VVT intake advance angle, exhaust delay angle, and the valve overlap angle fixed by the camshaft (e.g., 140°).

[0080] Furthermore, the commonly used automobile engine is a four-stroke engine, which completes a working cycle in four working strokes, including intake stroke, compression stroke, power stroke and exhaust stroke. Among them, during the intake stroke, the intake valve opens, the piston moves downward, and the mixture of gasoline and air enters the cylinder. When the piston moves to the lowest point, the intake valve is closed. During the compression stroke, both the intake valve and the exhaust valve are closed, the piston moves upward, and the mixture of gasoline and air is compressed, converting mechanical energy into internal energy. During the power stroke, the mixed gas is ignited by the spark plug, and the high-temperature and high-pressure gas generated pushes the piston to move downward, drives the crankshaft to rotate, and outputs power to the outside. During the exhaust stroke, the exhaust valve opens, the piston moves upward, and the exhaust gas after combustion is discharged from the cylinder. When the piston reaches the top, the exhaust valve is closed. Among them, when the exhaust stroke is converted to the intake stroke, the intake valve is opened in advance at the end of the exhaust stroke (i.e., before the top dead center of the piston), and the exhaust valve is closed with a delay at the beginning of the intake stroke (after the top dead center of the piston), thereby realizing valve overlap. A four-stroke engine requires the crankshaft to rotate two times (720°) for each cylinder to complete one working cycle (i.e., four strokes). That is, for every 720° rotation of the crankshaft, each cylinder can achieve one valve overlap.

[0081] Step S303: Obtaining the number of overlaps between the intake valve and the exhaust valve according to the number of crankshaft rotations.

[0082] Step S304: controlling the amount of low-temperature air entering the cylinder through the throttle valve and the intake manifold according to the overlap number and the preset cooling overlap angle.

[0083] It should be noted that, according to the preset shutdown speed of the engine set as above, the number of crankshaft rotations (for example, 2880°) of the engine crankshaft that continues to rotate due to inertia can be obtained. For every 720° rotation of the crankshaft, each cylinder can achieve valve overlap once, that is, 2880° can achieve valve overlap 4 times for each cylinder (2880 / 720=4). Each of the four cylinders with a preset cooling overlap angle (for example, 140°) can overlap 4 times.

[0084] It should be understood that it is also possible to open the intake valve of the cylinder in the intake stroke and the exhaust valve of the cylinder in the exhaust stroke according to the stroke state of each cylinder; open the intake valve of the cylinder in the exhaust stroke; control the opening sequence of the intake valve and the exhaust valve of each cylinder in turn, and control the intake valve opening advance angle and the exhaust valve closing delay angle according to the preset cooling overlap angle (for example, the intake valve is opened 60° in advance, the exhaust valve is closed 60° later, plus the 20° valve overlap angle fixed by the camshaft, thereby achieving a valve overlap angle of 140°).

[0085] In this embodiment, by collecting the engine speed, when it is detected that the engine speed is reduced to the preset shutdown speed, it is judged that the engine enters the shutdown condition, and the throttle of the engine is driven to open. After the throttle is opened, the overlap angle of the intake valve and the exhaust valve is set to the preset cooling overlap angle; the overlap times of the intake valve and the exhaust valve are obtained according to the crankshaft rotation times and the preset cooling overlap angle; the amount of low-temperature air entering the cylinder through the throttle and the intake manifold is controlled according to the overlap times. When the valves overlap, the fresh low-temperature air after the supercharger boosts enters each cylinder to discharge the high-temperature exhaust gas, and the low-temperature fresh air cools the combustion chamber at the same time to avoid the temperature of the combustion chamber from returning to the temperature when the engine is shut down. At the same time, the precise setting of the cooling overlap angle and the overlap times of each cylinder further improves the scavenging effect.

[0086] Based on the first embodiment and / or the second embodiment of the present application, in the third embodiment of the present application, the same or similar contents as those of the above-mentioned first and second embodiments can refer to the above introduction, and will not be repeated later. Figure 4 , Figure 4 A flow chart of the third embodiment of the engine shutdown control method of the present application is provided.

[0087] In step S40, the engine shutdown control method includes:

[0088] Step S401: After the throttle valve is opened, the supercharger is driven to supercharge the external low-temperature air.

[0089] Step S402: Control the supercharged low-temperature air to enter the cylinder through the throttle valve and the intake manifold.

[0090] It should be noted that the supercharger can increase the intake volume of the engine by compressing the air, and after the air is cooled by the intercooler, it enters the cylinder through the intake manifold through the throttle valve.

[0091] Step S403: driving the throttle valve to gradually close, and controlling the pressure relief valve to open at the same time.

[0092] Step S404: Control the pressurized low-temperature air to be discharged to the outside through the pressure relief valve.

[0093] It should be noted that when the temperature of the engine cylinder combustion chamber drops to a safe temperature and does not cause hardware damage to the cylinder head material and piston material, the throttle valve needs to be controlled to close gradually to prevent external air from entering the cylinder when the engine is stopped. At the same time, the intake manifold may still have a high air pressure value at this time, which may cause damage to the pipeline and the throttle valve. The electronic pressure relief valve is controlled to open to release the high-pressure gas in the manifold to the outside.

[0094] It should be understood that the control of the throttle valve and the pressure relief valve can be achieved by the ECU issuing control instructions to corresponding devices according to the engine operating conditions.

[0095] In this embodiment, after the throttle valve is opened, the supercharger is driven to pressurize the external low-temperature air; the supercharged low-temperature air is controlled to enter the cylinder through the intake manifold through the throttle valve. The throttle valve is driven to be gradually closed, and the pressure relief valve is controlled to be opened at the same time; the supercharged low-temperature air is controlled to be discharged to the outside through the pressure relief valve. After the high-temperature gas in the combustion chamber is swept out, the pressure relief valve is used to release the high-pressure gas inside the pipeline, thereby avoiding the damage of the supercharging pressure to the throttle valve and the supercharger, improving the stability of the system operation, and increasing the operating life.

[0096] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the engine shutdown control method of the present application. More simple transformations based on this technical concept are all within the protection scope of the present application.

[0097] This application also provides an engine shutdown control device, please refer to Figure 5 , the engine shutdown control device comprises:

[0098] The information acquisition module 10 is used to obtain the operating parameters of the vehicle engine;

[0099] A working condition judgment module 20, used for judging the shutdown condition of the engine according to the operating condition parameters;

[0100] The drive control module 30 is used to drive the throttle of the engine to open when it is detected that the engine enters a shutdown state;

[0101] The drive control module 30 is also used to control the low-temperature air to enter the cylinder through the intake manifold through the throttle valve after the throttle valve is opened.

[0102] Optionally, the operating condition judgment module 20 is also used to adjust the engine speed to a preset shutdown speed when an engine shutdown signal is detected, judge that the engine will enter a shutdown condition, and drive the engine throttle to open; the drive control module 30 is also used to set the overlap angle of the intake valve and the exhaust valve to a preset cooling overlap angle after the throttle is opened; obtain the overlap number of the intake valve and the exhaust valve according to the number of crankshaft rotations and the preset cooling overlap angle; control the amount of low-temperature air entering the cylinder from the intake manifold through the throttle according to the overlap number and the preset cooling overlap angle.

[0103] Optionally, the drive control module 30 is also used to obtain a preset valve overlap angle, a VVT intake advance angle and an exhaust delay angle of the camshaft in the engine; and set the preset cooling overlap angle according to the preset valve overlap angle, the VVT ​​intake advance angle and the exhaust delay angle.

[0104] Optionally, the drive control module 30 is also used to obtain the number of cylinders and the engine stroke of the engine; and obtain the number of overlaps between the intake valve and the exhaust valve according to the number of cylinders, the number of engine strokes and the number of crankshaft rotations.

[0105] Optionally, the drive control module 30 is also used to obtain the stroke status of each cylinder; open the intake valve of the cylinder in the intake stroke; open the exhaust valve of the cylinder in the exhaust stroke; control the opening sequence of the intake valve and the exhaust valve of each cylinder in turn, and control the intake valve opening advance angle and the exhaust valve closing delay angle according to a preset cooling overlap angle (for example, the intake valve opens 60° in advance, the exhaust valve closes 60° late, plus the 20° valve overlap angle fixed by the camshaft, thereby achieving a valve overlap angle of 140°).

[0106] Optionally, the drive control module 30 is further configured to drive a supercharger to pressurize external low-temperature air after the throttle valve is opened; and control the pressurized low-temperature air to enter the cylinder through the intake manifold via the throttle valve.

[0107] Optionally, the drive control module 30 is also used to drive the throttle valve to close gradually, and at the same time control the opening of the pressure relief valve; and control the pressurized low-temperature air to be discharged to the outside through the pressure relief valve.

[0108] The engine shutdown control device provided by the present application adopts the engine shutdown control method in the above embodiment, which can solve the technical problem that the combustion chamber cannot be cooled quickly due to sudden engine shutdown, causing hardware damage. Compared with the prior art, the beneficial effects of the engine shutdown control device provided by the present application are the same as the beneficial effects of the engine shutdown control method provided by the above embodiment, and other technical features in the engine shutdown control device are the same as the features disclosed in the above embodiment method, which will not be repeated here.

[0109] The present application provides an engine shutdown control device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the engine shutdown control method in the above-mentioned embodiment one.

[0110] Reference below Figure 6, which shows a schematic diagram of the structure of an engine shutdown control device suitable for implementing the embodiment of the present application. The engine shutdown control device in the embodiment of the present application may include but is not limited to mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 6 The engine shutdown control device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0111] like Figure 6 As shown, the engine stop control device may include a processing device 1001 (e.g., a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the engine stop control device are also stored. The processing device 1001, ROM1002, and RAM1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the engine shutdown control device to communicate wirelessly or wired with other devices to exchange data. Although the figure shows an engine shutdown control device with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be implemented or have alternatively.

[0112] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0113] The engine shutdown control device provided by the present application adopts the engine shutdown control method in the above embodiment, which can solve the technical problem that the combustion chamber cannot be quickly cooled down due to sudden engine shutdown, causing hardware damage. Compared with the prior art, the beneficial effects of the engine shutdown control device provided by the present application are the same as the beneficial effects of the engine shutdown control method provided by the above embodiment, and the other technical features of the engine shutdown control device are the same as the features disclosed in the method of the previous embodiment, which will not be repeated here.

[0114] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0115] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0116] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the engine shutdown control method in the above-mentioned embodiment.

[0117] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0118] The computer-readable storage medium may be included in the engine shutdown control device; or may exist independently without being assembled into the engine shutdown control device.

[0119] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0120] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0121] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0122] The readable storage medium provided in the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned engine shutdown control method, and can solve the technical problem that the combustion chamber cannot be quickly cooled down due to sudden engine shutdown, causing hardware damage. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in the present application are the same as the beneficial effects of the engine shutdown control method provided in the above-mentioned embodiment, and will not be repeated here.

[0123] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. An engine shutdown control method, characterized in that: The engine shutdown control method comprises: Obtaining operating condition parameters of the vehicle engine; Determining a shutdown status of the engine according to the operating condition parameters; When it is detected that the engine enters a shutdown state, the throttle valve of the driving engine is opened; After the throttle valve is opened, the amount of low-temperature air entering the cylinder from the intake manifold through the throttle valve is controlled.

2. The engine shutdown control method according to claim 1, characterized in that: The step of driving the throttle of the engine to open when detecting that the engine enters a shutdown condition comprises: When an engine shutdown signal is detected, the engine speed is adjusted to a preset shutdown speed, and it is determined that the engine will enter a shutdown condition, and the throttle of the engine is driven to open; The step of controlling the amount of low-temperature air entering the cylinder through the intake manifold through the throttle valve after the throttle valve is opened comprises: After the throttle valve is opened, setting the overlap angle of the intake valve and the exhaust valve to a preset cooling overlap angle; Obtaining the number of overlaps between the intake valve and the exhaust valve according to the number of crankshaft rotations and the preset cooling overlap angle; The amount of low-temperature air entering the cylinder from the intake manifold through the throttle valve is controlled according to the overlap number and the preset cooling overlap angle.

3. The engine shutdown control method according to claim 2, characterized in that: The step of setting the overlap angle of the intake valve and the exhaust valve to a preset cooling overlap angle comprises: Obtaining a preset valve overlap angle, a VVT intake advance angle, and an exhaust delay angle of a camshaft in the engine; The preset cooling overlap angle is set according to the preset valve overlap angle, the VVT ​​intake advance angle and the exhaust delay angle.

4. The engine shutdown control method according to claim 2, characterized in that: Before the step of obtaining the overlap number of the intake valve and the exhaust valve according to the crankshaft rotation number and the preset cooling overlap angle, the method further includes: Obtaining the number of cylinders and engine stroke of the engine; The step of obtaining the overlap times of the intake valve and the exhaust valve according to the crankshaft rotation times and the preset cooling overlap angle comprises: The number of overlaps between the intake valve and the exhaust valve is obtained according to the number of cylinders, the number of engine strokes and the number of crankshaft rotations.

5. The engine stop control method according to claim 4, characterized in that: After the step of obtaining the number of overlaps between the intake valve and the exhaust valve according to the number of cylinders, the number of engine strokes and the number of crankshaft rotations, the method further comprises: Get the stroke status of each cylinder; Opening the intake valve of the cylinder in the intake stroke; Opening the exhaust valve of the cylinder in the exhaust stroke; The opening sequence of the intake valve and the exhaust valve of each cylinder is controlled in sequence according to the overlap number, and the intake valve opening advance angle and the exhaust valve closing delay angle are controlled according to the preset cooling overlap angle.

6. The engine stop control method according to claim 1, characterized in that: The step of controlling the low-temperature air to enter the cylinder through the intake manifold through the throttle valve after the throttle valve is opened comprises: After the throttle valve is opened, the supercharger is driven to pressurize the external low-temperature air; The supercharged low-temperature air is controlled to enter the cylinder from the intake manifold through the throttle valve.

7. The engine stop control method according to claim 6, characterized in that: After the step of controlling the supercharged low-temperature air to enter the cylinder through the throttle valve from the intake manifold, the method further includes: driving the throttle valve to gradually close, and controlling the pressure relief valve to open at the same time; The low-temperature air after being pressurized is controlled to be discharged to the outside through the pressure relief valve.

8. An engine shutdown control device, characterized in that: The device comprises: An information acquisition module, used to obtain operating parameters of the vehicle engine; A working condition judgment module, used for judging the shutdown condition of the engine according to the operating condition parameters; A drive control module, used to drive the throttle valve of the engine to open when detecting that the engine enters a shutdown condition; The drive control module is also used to control the amount of low-temperature air entering the cylinder through the intake manifold through the throttle valve after the throttle valve is opened.

9. An engine shutdown control device, characterized in that: The device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the engine stop control method according to any one of claims 1 to 7.

10. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the engine shutdown control method according to any one of claims 1 to 7 are implemented.

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