Engine starting control method and device and computer readable storage medium

Abstract

The invention provides an engine starting control method and device and a computer readable storage medium. Comprising the steps that in the starting process of a range extender system, under the condition that it is determined that the rotating speed of an engine is zero, a pressure reducing rocker arm small piston of an engine valve mechanism is controlled to stretch out; the power supply module is used for supplying power to the starting and generating integrated motor, reversely dragging the engine by adopting the starting and generating integrated motor to increase the rotating speed of the engine, and controlling a small piston of the decompression rocker arm to retract when detecting that the rotating speed of the engine is greater than a first preset rotating speed of the engine; and under the condition that it is detected that the rotating speed of the engine is larger than the second preset rotating speed of the engine, the engine is controlled to be subjected to oil injection ignition, under the condition that ignition succeeds, the torque of the starting integrated motor is adjusted according to a preset torque unloading strategy, and starting of the engine is completed under the condition that the torque of the starting integrated motor is adjusted to the preset torque. The problem that in the starting process of an existing range extender, when an engine is reversely dragged by a starting integrated motor, the comfort of a driver and passengers of the whole vehicle is affected by engine shaking is solved.

Description

Technical Field

[0001] The present application relates to the technical field of engine starting control, and in particular, to an engine starting control method, device, computer-readable storage medium and electronic device. Background Art

[0002] To ensure battery life during vehicle operation, the range extender needs to allow the engine to generate electricity in a timely manner; this causes the engine to start frequently to provide power input to the generator. Frequent engine starts can cause frequent vehicle vibrations, resulting in poor comfort for drivers and passengers.

[0003] During the engine starting process in the range extender, the starter-generator integrated motor reverses the engine, and the residual gas in the engine cylinder is compressed during the compression stroke to produce a higher cylinder pressure peak, causing engine vibration and resulting in poor comfort for the vehicle's drivers and passengers. In addition, the higher cylinder pressure makes the crankshaft, piston and other moving parts bear a large load, the engine friction resistance torque is large, the starting time is long, and more electricity is consumed. Summary of the invention

[0004] The main purpose of the present application is to provide an engine starting control method, device, computer-readable storage medium and electronic device, so as to at least solve the problem that during the start-up process of the existing range extender, the engine jitter affects the comfort of the whole vehicle occupants during the stage of reverse dragging the engine by the starter-generator integrated motor.

[0005] In order to achieve the above-mentioned object, according to one aspect of the present application, a control method for engine starting is provided, comprising: in the process of starting a range extender system, when it is determined that the engine speed is zero, controlling the decompression rocker arm small piston of the engine valve mechanism to extend, the range extender system comprising an engine, an integrated starter motor and the engine valve mechanism, when the decompression rocker arm small piston extends, the decompression rocker arm small piston contacts the valve of the engine valve mechanism, and is used to decompress the engine compression cylinder; when it is determined that the decompression rocker arm small piston extends, powering the integrated starter motor to reverse the engine with the integrated starter motor to increase the engine speed, and when it is detected that the engine speed is greater than a first preset engine speed, controlling the decompression rocker arm small piston to retract; when it is detected that the engine speed is greater than a second preset engine speed, controlling the engine to inject fuel and ignite, and when the engine ignition is successful, adjusting the torque of the integrated starter motor according to the preset torque unloading strategy, and completing the engine starting when the torque of the integrated starter motor is adjusted to the preset torque, wherein the second preset engine speed is greater than the first preset engine speed.

[0006] Optionally, the torque of the starter motor is adjusted according to a preset torque unloading strategy, and the engine starting is completed when the torque of the starter motor is adjusted to the preset torque, including: adjusting the torque of the starter motor to a first torque according to a step torque unloading strategy, wherein the step torque unloading strategy is a control strategy in which the torque decreases step by step over time; when it is determined that the torque of the starter motor reaches the first torque, adjusting the torque of the starter motor to the preset torque using a linear torque unloading strategy, wherein the linear torque unloading strategy is a control strategy in which the torque decreases linearly step by step over time; when it is determined that the torque of the starter motor reaches the preset torque, determining that the engine starting operation is completed.

[0007] Optionally, when it is determined that the torque of the integrated starting motor reaches the first torque, a linear torque unloading strategy is adopted to adjust the torque of the integrated starting motor to the preset torque, including: when it is determined that the torque of the integrated starting motor reaches the first torque, determining the running time for the torque of the integrated starting motor to reach the first torque; when it is determined that the running time reaches a first preset time period, determining whether the torque fluctuation of the integrated starting motor is less than a fluctuation set value; when the torque fluctuation of the integrated starting motor is less than the fluctuation set value, a linear torque unloading strategy is adopted to adjust the torque of the integrated starting motor to the preset torque.

[0008] Optionally, the torque of the starting motor is adjusted to the preset torque by adopting a linear torque unloading strategy.

[0009] λ= oh max -oh min

[0010] Previously, the method also included: using the formula: ω m , evaluate the speed fluctuation stability of the engine, where λ is the speed fluctuation stability, ω max is the maximum speed fluctuation, ω min is the minimum value of speed fluctuation, ω m A difference value is preset for the speed fluctuation; and whether to adopt the linear torque unloading strategy to adjust the torque of the starter-in-one motor is determined according to the speed fluctuation stability.

[0011] Optionally, the first preset engine speed is determined based on the ambient temperature, the altitude, the coolant temperature, the oil temperature, the motor rotor moment of inertia, the motor efficiency curve and the battery power of the whole vehicle; the second preset engine speed is determined based on the ambient temperature, the altitude, the coolant temperature, the oil temperature, the engine air intake and the fuel injection amount.

[0012] Optionally, when it is detected that the engine speed is greater than a first preset engine speed, the small piston of the decompression rocker arm is controlled to retract, including: detecting the engine speed after a second preset time period; and when the engine speed is greater than the first preset engine speed, controlling the small piston of the decompression rocker arm to retract.

[0013] Optionally, the second preset time period is determined according to ambient temperature, altitude, coolant temperature and engine oil temperature.

[0014] According to another aspect of the present application, a control device for starting an engine is provided, comprising: a first control unit, for controlling the extension of a small piston of a decompression rocker arm of an engine valve mechanism during the start-up of a range extender system and when it is determined that the engine speed is zero, the range extender system comprises an engine, an integrated starter motor and the engine valve mechanism, when the small piston of the decompression rocker arm is extended, the small piston of the decompression rocker arm contacts a valve of the engine valve mechanism, and is used to decompress the engine compression cylinder; a second control unit, for supplying power to the integrated starter motor when it is determined that the small piston of the decompression rocker arm is extended, so as to reversely drag the engine with the integrated starter motor to increase the engine speed, and when it is detected that the engine speed is greater than a first preset engine speed, controlling the small piston of the decompression rocker arm to retract; a third control unit, for controlling the injection ignition of the engine when it is detected that the engine speed is greater than a second preset engine speed, and when the engine ignition is successful, adjusting the torque of the integrated starter motor according to a preset torque unloading strategy, and completing the engine starting when the torque of the integrated starter motor is adjusted to the preset torque, wherein the second preset engine speed is greater than the first preset engine speed.

[0015] According to another aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute any one of the engine starting control methods.

[0016] According to another aspect of the present application, an electronic device is provided, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include a control method for executing any one of the engine starting methods described.

[0017] By applying the technical solution of the present application, during the process of starting the range extender system and when it is determined that the engine speed is zero, the small piston of the decompression rocker arm of the engine valve mechanism is controlled to extend, the range extender system includes an engine, an integrated starting motor and an engine valve mechanism, when the small piston of the decompression rocker arm is extended, the small piston of the decompression rocker arm contacts the valve of the engine valve mechanism, and is used to decompress the engine compression cylinder; when it is determined that the small piston of the decompression rocker arm is extended, the integrated starting motor is powered to reverse the engine using the integrated starting motor to increase the engine speed, and when it is detected that the engine speed is greater than a first preset engine speed, the small piston of the decompression rocker arm is controlled to retract; when it is detected that the engine speed is greater than a second preset engine speed, the engine fuel injection ignition is controlled, and when the engine ignition is successful, the torque of the integrated starting motor is adjusted according to the preset torque unloading strategy, and when the torque of the integrated starting motor is adjusted to the preset torque, the engine starting is completed, wherein the second preset engine speed is greater than the first preset engine speed. By controlling the exhaust valve to open during the compression stroke and expansion stroke and releasing the compression pressure in the cylinder to achieve decompression starting, the range extender starts quickly and smoothly, improving the NVH comfort of the vehicle and reducing energy consumption. This solves the problem of engine shaking during the engine reverse dragging stage of the starter-generator motor during the starting process of the existing range extender, which causes comfort to the vehicle's drivers and passengers. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 A schematic flow chart of a method for controlling engine starting according to an embodiment of the present application is shown;

[0020] Figure 2 A structural diagram of an engine valve mechanism provided according to an embodiment of the present application is shown;

[0021] Figure 3 A schematic diagram of a decompression release principle provided according to an embodiment of the present application is shown;

[0022] Figure 4 shows a valve lift curve diagram of an exhaust valve provided according to an embodiment of the present application;

[0023] Figure 5 The diagram shows the motion diagram of the small piston of the decompression rocker arm provided according to the embodiment of the present application;

[0024] Figure 6 A control logic diagram of a specific engine starting control method provided according to an embodiment of the present application is shown;

[0025] Figure 7 A comparison diagram of engine cylinder pressure curves provided according to an embodiment of the present application is shown;

[0026] Figure 8 shows a comparison diagram of engine starting time provided according to an embodiment of the present application;

[0027] Fig. 9 A schematic diagram of a dynamic adjustment correction algorithm for setting time 1 provided according to an embodiment of the present application is shown;

[0028] Fig.10 A schematic diagram of dynamic adjustment and correction of the engine speed setting value 2 provided according to an embodiment of the present application is shown;

[0029] Fig.11 A schematic diagram of dynamic adjustment and correction of the engine speed setting value 3 provided according to an embodiment of the present application is shown;

[0030] Fig.12 A schematic diagram of torque unloading of a starter-in-one motor provided according to an embodiment of the present application is shown;

[0031] Fig.13 A structural block diagram of an engine starting control device provided according to an embodiment of the present application is shown.

[0032] The above drawings include the following reference numerals:

[0033] 1. Cam; 2. Rocker arm structure; 2-1. Braking rocker arm; 2-2. Exhaust rocker arm; 2-3. Pressure reducing rocker arm small piston; 3. Valve bridge; 4. Valve spring; 5. Valve; 6. Cylinder head; 7. Valve clearance compensation structure. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0036] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0037] For the convenience of description, some nouns or terms involved in the embodiments of the present application are explained below:

[0038] Range extender: It consists of an engine and a starter-generator motor. The engine is connected to the starter-generator motor through a mechanical connection. The engine shaft system drives the motor shaft system to work, and the starter-generator motor generates electricity externally. The starter-generator motor can generate electricity and can also be used as an electric motor. The engine starter in the range extender relies on the starter-generator motor to start. The engine in the range extender has no mechanical connection with the vehicle's transmission system, and is separated from the road slope load excitation. After the engine starts, it always runs in the high-efficiency area.

[0039] Starting mode: The starter motor reverses the engine speed to a certain speed, the starter motor gradually withdraws, the engine starts to spray fuel, and finally the engine starts. The starting process refers to the continuous process from the start of the engine crankshaft to the start of fuel injection.

[0040] As introduced in the background technology, during the starting process of the existing range extender, the engine jitter affects the comfort of the whole vehicle passengers when the starting-up motor is in the stage of reverse towing the engine. In order to solve the problem that during the starting process of the existing range extender, the engine jitter affects the comfort of the whole vehicle passengers when the starting-up motor is in the stage of reverse towing the engine, the embodiments of the present application provide an engine starting control method, device, computer-readable storage medium and electronic device.

[0041] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0042] In this embodiment, a control method for starting an engine running on a mobile terminal, a computer terminal or a similar computing device is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0043] Figure 1 FIG. 1 is a flow chart of a method for controlling engine starting according to an embodiment of the present application. Figure 1 As shown, the method comprises the following steps:

[0044] Step S201, during the process of starting the range extender system, when it is determined that the engine speed is zero, controlling the small piston of the decompression rocker arm of the engine valve mechanism to extend, the range extender system comprising an engine, a starter-in-one motor and the engine valve mechanism, when the small piston of the decompression rocker arm extends, the small piston of the decompression rocker arm contacts the valve of the engine valve mechanism, so as to decompress the engine compression cylinder;

[0045] The starting process of the range extender can be divided into two processes. The first process is that the starter motor quickly drags the engine to a certain speed. In the reverse dragging stage, the residual gas in the cylinder of the engine is compressed during the compression stroke to produce a high cylinder pressure peak, causing engine vibration and poor comfort for the vehicle's drivers and passengers. In the second stage, the engine ignition stage, the starter motor gradually exits, and the engine tries to ignite on its own until the range extender shaft system speed stabilizes.

[0046] Among them, the structural diagram of the engine valve mechanism is as follows Figure 2 As shown, it includes: a cam 1, a rocker arm structure 2, a valve structure, an engine control structure and a valve clearance compensation structure 7, the valve clearance compensation structure 7 is arranged between the rocker arm structure 2 and the valve structure, the rocker arm structure 2 includes an exhaust rocker arm 2-2, a decompression rocker arm small piston 2-3, and a brake rocker arm 2-1, the cam 1 is in contact with one end of the brake rocker arm 2-1, the other end of the brake rocker arm 2-1 is integrated with the exhaust rocker arm 2-2, and the other end of the exhaust rocker arm 2-2 is connected to the valve structure through the valve clearance compensation structure 7. The valve structure includes a valve bridge 3, a valve spring 4, a valve 5 and a cylinder head 6.

[0047] Among them, a small motor is used to control the driving mechanism to ensure the extension and retraction of the small piston of the pressure reducing rocker arm.

[0048] Step S202, when it is determined that the small piston of the decompression rocker arm is extended, power is supplied to the starting-integrated motor so as to reversely drag the engine with the starting-integrated motor to increase the engine speed, and when it is detected that the engine speed is greater than a first preset engine speed, the small piston of the decompression rocker arm is controlled to retract;

[0049] Specifically, during the engine starting process, when the starter-in-one motor is in the stage of reversely dragging the engine, the small piston of the decompression rocker arm extends, allowing an exhaust valve to open during the compression stroke and the expansion stroke, releasing the compression pressure in the cylinder. In this way, the pressure in the cylinder is greatly reduced, reducing the load on moving parts such as the crankshaft and the piston, and reducing the friction torque of the engine. At the same time, the starter-in-one motor has a high speed, and starts quickly and smoothly, achieving decompression starting, improving the comfort of the vehicle's drivers and passengers, and reducing energy consumption.

[0050] Step S203, when it is detected that the engine speed is greater than the second preset engine speed, the engine fuel injection ignition is controlled, and when the engine ignition is successful, the torque of the starter-in-one motor is adjusted according to the preset torque unloading strategy, and when the torque of the starter-in-one motor is adjusted to the preset torque, the engine starting is completed, wherein the second preset engine speed is greater than the first preset engine speed.

[0051] Through this embodiment, during the start-up process of the range extender system, and when it is determined that the engine speed is zero, the small piston of the decompression rocker arm of the engine valve mechanism is controlled to extend, and the range extender system includes an engine, an integrated starting motor and an engine valve mechanism. When the small piston of the decompression rocker arm is extended, the small piston of the decompression rocker arm contacts the valve of the engine valve mechanism to decompress the engine compression cylinder; when it is determined that the small piston of the decompression rocker arm is extended, the integrated starting motor is powered to use the integrated starting motor to reverse the engine to increase the engine speed, and when it is detected that the engine speed is greater than a first preset engine speed, the small piston of the decompression rocker arm is controlled to retract; when it is detected that the engine speed is greater than a second preset engine speed, the engine fuel injection ignition is controlled, and when the engine ignition is successful, the torque of the integrated starting motor is adjusted according to the preset torque unloading strategy, and when the torque of the integrated starting motor is adjusted to the preset torque, the engine starting is completed, wherein the second preset engine speed is greater than the first preset engine speed. By controlling the exhaust valve to open during the compression stroke and expansion stroke and releasing the compression pressure in the cylinder to achieve decompression starting, the range extender starts quickly and smoothly, improving the NVH comfort of the vehicle and reducing energy consumption. This solves the problem of engine shaking during the engine reverse dragging stage of the starter-generator motor during the starting process of the existing range extender, which causes comfort to the vehicle's drivers and passengers.

[0052] During the specific implementation process, the torque of the above-mentioned integrated starter motor is adjusted according to a preset torque unloading strategy, and the engine starting is completed when the torque of the above-mentioned integrated starter motor is adjusted to the preset torque, including: adjusting the torque of the above-mentioned integrated starter motor to a first torque according to a step torque unloading strategy, wherein the step torque unloading strategy is a control strategy in which the torque decreases stepwise over time; when it is determined that the torque of the above-mentioned integrated starter motor reaches the above-mentioned first torque, adjusting the torque of the above-mentioned integrated starter motor to the above-mentioned preset torque using a linear torque unloading strategy, wherein the linear torque unloading strategy is a control strategy in which the torque decreases linearly stepwise over time; when it is determined that the torque of the above-mentioned integrated starter motor reaches the above-mentioned preset torque, it is determined that the above-mentioned engine starting operation is completed.

[0053] The step-by-step unloading method means that during the unloading process, the motor torque is gradually reduced in a step-by-step manner. The linear unloading strategy means that the motor torque gradually decreases linearly over time, quickly reducing the torque and reducing the entire starting process time.

[0054] Specifically, when it is determined that the torque of the above-mentioned integrated starting motor reaches the above-mentioned first torque, a linear torque unloading strategy is adopted to adjust the torque of the above-mentioned integrated starting motor to the above-mentioned preset torque, including: when it is determined that the torque of the above-mentioned integrated starting motor reaches the above-mentioned first torque, determining the running time for the torque of the above-mentioned integrated starting motor to reach the above-mentioned first torque; when it is determined that the above-mentioned running time reaches a first preset time period, determining whether the torque fluctuation of the above-mentioned integrated starting motor is less than the fluctuation setting value; when the torque fluctuation of the above-mentioned integrated starting motor is less than the above-mentioned fluctuation setting value, a linear torque unloading strategy is adopted to adjust the torque of the above-mentioned integrated starting motor to the above-mentioned preset torque.

[0055] The step-by-step unloading of the method means that during the unloading process, the motor torque is gradually reduced in a step-by-step manner and then remains stable for a period of time (a first preset time period). The first preset time period is set to more precisely control the exit timing of the motor.

[0056] More specifically, the linear torque unloading strategy is used to adjust the torque of the starting motor to the preset value.

[0057] λ= oh max -oh min

[0058] Before the torque, the above method also includes: using the formula: ω m , evaluate the speed fluctuation stability of the above engine, where λ is the speed fluctuation stability, ω max is the maximum speed fluctuation, ω min is the minimum value of speed fluctuation, ω mA difference is preset for the speed fluctuation; and according to the speed fluctuation stability, it is determined whether to use the linear torque unloading strategy to adjust the torque of the starter motor. The method determines whether the engine has been started smoothly by evaluating the speed fluctuation stability of the engine.

[0059] Furthermore, the first preset engine speed is determined based on the ambient temperature, the altitude, the coolant temperature, the oil temperature, the motor rotor moment of inertia, the motor efficiency curve and the battery power of the whole vehicle; the second preset engine speed is determined based on the ambient temperature, the altitude, the coolant temperature, the oil temperature, the engine air intake and the fuel injection amount.

[0060] The first preset engine speed of the method is the initial speed of the engine starting. The first preset engine speed is dynamically adjusted and corrected based on the first preset engine speed initial value, taking into account parameters such as ambient temperature, altitude, coolant temperature, oil temperature, motor rotor moment of inertia, motor efficiency curve, and vehicle battery power to adapt to different starting conditions. The first preset engine speed initial value is based on the friction work data of the engine bench at normal temperature, and finds the crankshaft speed when the starter can easily drag the engine and the starter efficiency is high.

[0061] The second preset engine speed is the critical value for the engine speed to reach the injection ignition. The second preset engine speed is dynamically adjusted and corrected based on the second preset engine speed initial value, taking into account parameters such as ambient temperature, altitude, coolant temperature, oil temperature, intake air volume, fuel injection volume, etc., to achieve a better starting effect. The second preset engine speed initial value is to find the minimum crankshaft speed for stable engine combustion by considering the combustion characteristics of the engine bench engine at normal temperature.

[0062] Specifically, when it is detected that the engine speed is greater than the first preset engine speed, the small piston of the decompression rocker arm is controlled to retract, including: detecting the engine speed after a second preset time period; when the engine speed is greater than the first preset engine speed, controlling the small piston of the decompression rocker arm to retract.

[0063] More specifically, the second preset time period is determined according to the ambient temperature, the altitude, the coolant temperature and the engine oil temperature.

[0064] The second preset time period of the method is dynamically adjusted and corrected based on the initial value of the second preset time period, taking into account parameters such as ambient temperature, altitude, coolant temperature, and oil temperature. When the engine speed is detected to be greater than the first preset engine speed after the second preset time period, it indicates that the compression pressure in the cylinder is released, and the small piston of the decompression rocker arm is controlled to retract.

[0065] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of the engine starting control method of the present application will be described in detail below in conjunction with specific embodiments.

[0066] This embodiment relates to a specific engine starting control method, which specifically includes the following contents:

[0067] The starting process of the range extender can be divided into two processes. The first process is that the starter motor quickly drags the engine to a certain speed. In the reverse dragging stage, the residual gas in the cylinder of the engine is compressed during the compression stroke to produce a high cylinder pressure peak, causing engine vibration and poor comfort for the vehicle's drivers and passengers. In the second stage, the engine ignition stage, the starter motor gradually exits, and the engine tries to ignite on its own until the range extender shaft system speed stabilizes.

[0068] The resistance torque during the engine starting process includes the gas torque generated by the gas in the cylinder, the inertia torque generated by the piston-connecting rod system, and the friction torque generated by the main bearing, piston-cylinder sleeve sliding pair, connecting rod bearing, gear bearing and other moving pairs. During the engine compression stroke, the gas torque in the cylinder hinders the rotation of the shaft system. The greater the compression ratio of the engine piston, the greater the resistance torque generated by the compressed gas during the compression stroke. The farther the piston is from the compression top dead center, the longer the compression stroke, the greater the peak cylinder pressure in the first cycle, and the greater the vehicle shake. During the starting process, the lower the ambient temperature, the lower the coolant temperature, and the lower the oil temperature when the engine is reversed, the greater the resistance torque.

[0069] This embodiment proposes a decompression starting strategy for the range extender. During the engine starting process, when the motor is in the stage of reversely dragging the engine, the small piston of the decompression rocker arm extends to achieve the opening of an exhaust valve during the compression stroke and the expansion stroke, releasing the compression pressure in the cylinder. In this way, the pressure in the cylinder is greatly reduced, the load on moving parts such as the crankshaft and the piston is reduced, the friction resistance torque of the engine is reduced, and decompression starting is achieved.

[0070] Among them, the principle of pressure relief is as follows Figure 3 As shown, the decompression function is realized by extending the small piston of the decompression rocker arm to actively open the exhaust valve. During the compression stroke and expansion stroke, the exhaust valve opens, and the work done by the engine to compress the air in the cylinder is released into the exhaust system. There is no energy to back-press the piston during the expansion stroke, thus realizing the decompression function.

[0071] Among them, the exhaust valve control method is as follows Figure 4 , Figure 5 As shown in Table 1, the exhaust valve opens during the compression stroke and the expansion stroke, and a pit is machined on the matching piston to ensure that there is a certain distance between the exhaust valve and the piston at the compression top dead center to avoid collision failure.

[0072] Table 1

[0073]

[0074] Figure 6 It is a control logic diagram of a specific engine starting control method, such as Figure 6 As shown, the specific steps include:

[0075] Step 1: Determine whether the engine speed is zero. If it is zero, the small piston of the decompression rocker arm of the engine valve mechanism extends, the starting and starting integrated motor is powered, and the starting and starting integrated motor reverses the engine, and the reverse dragging duration is a set value 1;

[0076] Step 2: Determine whether the engine speed is greater than a set value 2. If it is greater than the set value 2, the small piston of the decompression rocker arm of the engine valve mechanism is retracted;

[0077] Step 3: The starter motor reverses the engine speed to the set value 3; the engine attempts to inject fuel and ignite; the starter motor torque gradually unloads using strategy 4, and after waiting for the set time 5, determines whether the engine speed fluctuation is less than the set value 6. If it is less than the set value 6, the starter motor torque quickly unloads using strategy 7, and the engine starts successfully; otherwise, adjust the torque unloading strategy 4 again and repeat the above steps.

[0078] The comparison of engine cylinder pressure curve is shown in the figure below: Figure 7 As shown, the use of this embodiment can reduce the cylinder pressure by 40%, reduce engine vibration and improve the NVH comfort of the whole vehicle. Reduce the load on the crankshaft-piston and other moving parts, reduce the engine starting torque, and shorten the starting time by about 30% under laboratory conditions. The engine starting time comparison chart is shown in Figure 8 As shown, the starting resistance torque is reduced, and the energy consumption of the battery caused by frequent starting of the starter-generator motor is reduced; the subjective NVH evaluation of the whole vehicle is improved from obvious shaking and impact to very slight.

[0079] The control strategy of this embodiment integrates multiple parameters to construct an intelligent control pressure reduction starting strategy. Figure 6 The parameter setting values ​​are not necessarily fixed. Through the accumulation of vehicle operating condition data, the setting values ​​can be adaptively adjusted to make the strategy more in line with actual usage and improve starting efficiency and comfort.

[0080] in, Figure 6 The setting time 1 in the dynamic adjustment correction algorithm is as follows Fig. 9 As shown: Based on the initial value, dynamic adjustment and correction are performed taking into account parameters such as ambient temperature, altitude, coolant temperature, and oil temperature.

[0081] The dynamic adjustment and correction algorithm for the initial engine start speed is as follows: Fig.10As shown: The preset value of engine speed 2 is dynamically adjusted and corrected based on the initial value, taking into account parameters such as ambient temperature, altitude, coolant temperature, oil temperature, motor rotor moment of inertia, motor efficiency curve, and vehicle battery power to adapt to different starting conditions.

[0082] The initial value of the engine speed 2 is based on the friction work data of the engine bench at normal temperature, and is used to find the crankshaft speed when the starter can easily drag the engine and the starter efficiency is high.

[0083] Engine speed setting value 3: The engine speed reaches the critical value for injection ignition and is greater than engine speed 2.

[0084] The preset value of engine speed 3 is dynamically adjusted and corrected based on the initial value, taking into account parameters such as ambient temperature, altitude, coolant temperature, oil temperature, intake air volume, fuel injection volume, etc., to achieve a better starting effect. The dynamic adjustment correction algorithm of speed 3 is set as follows: Fig.11 shown.

[0085] The initial value of the engine speed 3 is the minimum crankshaft speed for stable combustion of the engine, which is obtained by considering the combustion characteristics of the engine on the engine bench at normal temperature.

[0086] Torque unloading strategy 4 is a step-by-step unloading strategy. Step-by-step unloading means that during the unloading process, the motor torque gradually decreases in a step-by-step manner and then remains stable for a period of time (set time 5). Setting time 5 is to more precisely control the exit timing of the motor. Torque unloading strategy 7 is a linear unloading strategy. The linear unloading strategy means that the motor torque gradually decreases linearly over time, quickly reducing the torque and reducing the entire starting process time. The schematic diagram of the torque unloading of the starter motor is shown in Fig.12 shown.

[0087] The engine speed fluctuation set value 6 is used to determine whether the engine has started smoothly, from the crankshaft speed sensor signal in the engine electronic control unit, using the formula: Accurately judge the stability of engine speed fluctuations, where ω max is the maximum speed fluctuation, ω min is the minimum value of speed fluctuation, ω m Preset differential value for speed fluctuations.

[0088] This embodiment is applicable to range extender products containing multi-cylinder engines, with little change to the engine body structure. By controlling the exhaust valve to open during the compression stroke and the expansion stroke to release the compression pressure in the cylinder, the range extender starts quickly and smoothly, improving the NVH comfort of the entire vehicle and reducing power consumption.

[0089] This embodiment adds a decompression rocker arm, which makes little change to the range extender engine body structure; in addition, it reduces the load on the crankshaft-piston and other moving parts, reduces the engine starting torque, shortens the starting time by 30%, and reduces the electric energy consumption of the motor; and the pressure in the cylinder is greatly reduced, reducing the engine vibration and improving the comfort of the whole vehicle. By reducing the compression pressure peak of the reverse engine by 40%, the friction work of the crankshaft-piston and other moving parts is reduced, so as to reduce the vibration during the engine starting process, improve the comfort of the whole vehicle, shorten the starting time by 30%, and reduce the electric energy consumption of the motor; the subjective NVH evaluation of the whole vehicle is improved from obvious vibration impact to very slight.

[0090] The embodiment of the present application also provides a control device for engine starting. It should be noted that the control device for engine starting of the embodiment of the present application can be used to execute the control method for engine starting provided by the embodiment of the present application. The device is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware for a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0091] The following is an introduction to the engine starting control device provided in an embodiment of the present application.

[0092] Fig.13 Schematic diagram of an engine starting control device according to an embodiment of the present application. Fig.13 As shown, the device comprises:

[0093] The first control unit 1301 is used to control the extension of the small piston of the decompression rocker arm of the engine valve mechanism during the start-up of the range extender system and when it is determined that the engine speed is zero, the range extender system includes an engine, an integrated starter motor and the engine valve mechanism, and when the small piston of the decompression rocker arm is extended, the small piston of the decompression rocker arm contacts the valve of the engine valve mechanism to decompress the engine compression cylinder;

[0094] The second control unit 1302 is used for, when it is determined that the small piston of the decompression rocker arm is extended, supplying power to the starting-integrated motor so as to reversely drag the engine with the starting-integrated motor to increase the engine speed, and when it is detected that the engine speed is greater than a first preset engine speed, controlling the small piston of the decompression rocker arm to retract;

[0095] The third control unit 1303 is used to control the fuel injection and ignition of the engine when it is detected that the engine speed is greater than a second preset engine speed, and when the engine ignition is successful, adjust the torque of the integrated starter motor according to a preset torque unloading strategy, and complete the engine starting when the torque of the integrated starter motor is adjusted to the preset torque, wherein the second preset engine speed is greater than the first preset engine speed.

[0096] In this embodiment, the first control unit is used to control the extension of the decompression rocker arm piston of the engine valve mechanism during the start-up of the range extender system and when it is determined that the engine speed is zero. The range extender system includes an engine, an integrated starter motor and the engine valve mechanism. When the decompression rocker arm piston is extended, the decompression rocker arm piston contacts the valve of the engine valve mechanism to decompress the engine compression cylinder; the second control unit is used to supply power to the integrated starter motor when it is determined that the decompression rocker arm piston is extended, so as to reverse the engine with the integrated starter motor to increase the engine speed, and when it is detected that the engine speed is greater than the first preset engine speed, control the decompression rocker arm piston to retract; the third control unit is used to control the fuel injection ignition of the engine when it is detected that the engine speed is greater than the second preset engine speed, and when the engine ignition is successful, adjust the torque of the integrated starter motor according to the preset torque unloading strategy, and complete the engine starting when the torque of the integrated starter motor is adjusted to the preset torque, wherein the second preset engine speed is greater than the first preset engine speed. The problem that during the start-up process of the existing range extender, the engine jitter during the reverse engine dragging stage of the starter-generator integrated motor affects the comfort of the whole vehicle's drivers and passengers is solved.

[0097] As an optional scheme, the third control unit includes a first adjustment module, a second adjustment module and a first determination module, the first adjustment module is used to adjust the torque of the above-mentioned starting motor to the first torque according to the step torque unloading strategy, wherein the above-mentioned step torque unloading strategy is a control strategy in which the torque decreases step by step over time; the second adjustment module is used to adjust the torque of the above-mentioned starting motor to the above-mentioned preset torque by adopting a linear torque unloading strategy when it is determined that the torque of the above-mentioned starting motor reaches the above-mentioned first torque, wherein the above-mentioned linear torque unloading strategy is a control strategy in which the torque gradually decreases linearly over time; the first determination module is used to determine that the above-mentioned engine starting operation is completed when it is determined that the torque of the above-mentioned starting motor reaches the above-mentioned preset torque.

[0098] An optional scheme, the second adjustment module includes a first determination submodule, a second determination submodule and an adjustment submodule; the first determination submodule is used to determine the running time of the torque of the starting-in-one motor to reach the above-mentioned first torque when it is determined that the torque of the starting-in-one motor reaches the above-mentioned first torque; the second determination submodule is used to determine whether the torque fluctuation of the starting-in-one motor is less than the fluctuation setting value when it is determined that the above-mentioned running time reaches a first preset time period; the adjustment submodule is used to adopt a linear torque unloading strategy to adjust the torque of the starting-in-one motor to the above-mentioned preset torque when the torque fluctuation of the starting-in-one motor is less than the above-mentioned fluctuation setting value.

[0099] In an optional solution, the third control unit includes an evaluation module and a third adjustment module; the evaluation module is used to use the formula: Evaluate the speed fluctuation stability of the above engine, where λ is the speed fluctuation stability, ω max is the maximum speed fluctuation, ω min is the minimum value of speed fluctuation, ω m A preset difference value is provided for the speed fluctuation; and a third adjustment module is used to determine whether to adopt the linear torque unloading strategy to adjust the torque of the starter-in-one motor according to the speed fluctuation stability.

[0100] An optional solution, the device also includes a first determination unit and a second determination unit; the first determination unit is used to determine the above-mentioned first preset engine speed based on the ambient temperature, the altitude, the coolant temperature, the oil temperature, the motor rotor moment of inertia, the motor efficiency curve and the battery power of the whole vehicle; the second determination unit is used to determine the above-mentioned second preset engine speed based on the above-mentioned ambient temperature, the above-mentioned altitude, the above-mentioned coolant temperature, the above-mentioned oil temperature, the engine intake volume and the fuel injection volume.

[0101] An optional solution is that the second control unit includes a detection module and a control module; the detection module is used to detect the above-mentioned engine speed after a second preset time period; the control module is used to control the retraction of the above-mentioned pressure reducing rocker arm small piston when the above-mentioned engine speed is greater than the above-mentioned first preset engine speed.

[0102] In an optional solution, the second control unit includes a second determination module, which is used to determine the above-mentioned second preset time period according to the ambient temperature, altitude, coolant temperature and engine oil temperature.

[0103] The engine start control device includes a processor and a memory. The first control unit, the second control unit and the third control unit are stored in the memory as program units, and the processor executes the program units stored in the memory to implement corresponding functions. The modules are all located in the same processor; or, the modules are located in different processors in any combination.

[0104] The processor includes a kernel, which retrieves the corresponding program unit from the memory. One or more kernels can be set, and the kernel parameters can be adjusted to solve the problem of engine vibration affecting the comfort of the whole vehicle passengers during the start-up process of the existing range extender when the starter-generator integrated motor reverses the engine.

[0105] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0106] An embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the engine starting control method.

[0107] Specifically, the engine starting control method includes:

[0108] Step S201, during the process of starting the range extender system, when it is determined that the engine speed is zero, controlling the small piston of the decompression rocker arm of the engine valve mechanism to extend, the range extender system comprising an engine, a starter-in-one motor and the engine valve mechanism, when the small piston of the decompression rocker arm extends, the small piston of the decompression rocker arm contacts the valve of the engine valve mechanism, so as to decompress the engine compression cylinder;

[0109] Step S202, when it is determined that the small piston of the decompression rocker arm is extended, power is supplied to the starting-integrated motor so as to reversely drag the engine with the starting-integrated motor to increase the engine speed, and when it is detected that the engine speed is greater than a first preset engine speed, the small piston of the decompression rocker arm is controlled to retract;

[0110] Step S203, when it is detected that the engine speed is greater than the second preset engine speed, the engine fuel injection ignition is controlled, and when the engine ignition is successful, the torque of the starter-in-one motor is adjusted according to the preset torque unloading strategy, and when the torque of the starter-in-one motor is adjusted to the preset torque, the engine starting is completed, wherein the second preset engine speed is greater than the first preset engine speed.

[0111] An embodiment of the present invention provides a processor, and the processor is used to run a program, wherein the engine starting control method is executed when the program is run.

[0112] Specifically, the engine starting control method includes:

[0113] Step S201, during the process of starting the range extender system, when it is determined that the engine speed is zero, controlling the small piston of the decompression rocker arm of the engine valve mechanism to extend, the range extender system comprising an engine, a starter-in-one motor and the engine valve mechanism, when the small piston of the decompression rocker arm extends, the small piston of the decompression rocker arm contacts the valve of the engine valve mechanism, so as to decompress the engine compression cylinder;

[0114] Step S202, when it is determined that the small piston of the decompression rocker arm is extended, power is supplied to the starting-integrated motor so as to reversely drag the engine with the starting-integrated motor to increase the engine speed, and when it is detected that the engine speed is greater than a first preset engine speed, the small piston of the decompression rocker arm is controlled to retract;

[0115] Step S203, when it is detected that the engine speed is greater than the second preset engine speed, the engine fuel injection ignition is controlled, and when the engine ignition is successful, the torque of the starter-in-one motor is adjusted according to the preset torque unloading strategy, and when the torque of the starter-in-one motor is adjusted to the preset torque, the engine starting is completed, wherein the second preset engine speed is greater than the first preset engine speed.

[0116] An embodiment of the present invention provides an electronic device, the device comprising a processor, a memory, and a program stored in the memory and executable on the processor, and when the processor executes the program, at least the following steps are implemented:

[0117] Step S201, during the process of starting the range extender system, when it is determined that the engine speed is zero, controlling the small piston of the decompression rocker arm of the engine valve mechanism to extend, the range extender system comprising an engine, a starter-in-one motor and the engine valve mechanism, when the small piston of the decompression rocker arm extends, the small piston of the decompression rocker arm contacts the valve of the engine valve mechanism, so as to decompress the engine compression cylinder;

[0118] Step S202, when it is determined that the small piston of the decompression rocker arm is extended, power is supplied to the starting-integrated motor so as to reversely drag the engine with the starting-integrated motor to increase the engine speed, and when it is detected that the engine speed is greater than a first preset engine speed, the small piston of the decompression rocker arm is controlled to retract;

[0119] Step S203, when it is detected that the engine speed is greater than the second preset engine speed, the engine fuel injection ignition is controlled, and when the engine ignition is successful, the torque of the starter-in-one motor is adjusted according to the preset torque unloading strategy, and when the torque of the starter-in-one motor is adjusted to the preset torque, the engine starting is completed, wherein the second preset engine speed is greater than the first preset engine speed.

[0120] The devices in this article can be servers, PCs, PADs, mobile phones, etc.

[0121] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program for initializing at least the following method steps:

[0122] Step S201, during the process of starting the range extender system, when it is determined that the engine speed is zero, controlling the small piston of the decompression rocker arm of the engine valve mechanism to extend, the range extender system comprising an engine, a starter-in-one motor and the engine valve mechanism, when the small piston of the decompression rocker arm extends, the small piston of the decompression rocker arm contacts the valve of the engine valve mechanism, so as to decompress the engine compression cylinder;

[0123] Step S202, when it is determined that the small piston of the decompression rocker arm is extended, power is supplied to the starting-integrated motor so as to reversely drag the engine with the starting-integrated motor to increase the engine speed, and when it is detected that the engine speed is greater than a first preset engine speed, the small piston of the decompression rocker arm is controlled to retract;

[0124] Step S203, when it is detected that the engine speed is greater than the second preset engine speed, the engine fuel injection ignition is controlled, and when the engine ignition is successful, the torque of the starter-in-one motor is adjusted according to the preset torque unloading strategy, and when the torque of the starter-in-one motor is adjusted to the preset torque, the engine starting is completed, wherein the second preset engine speed is greater than the first preset engine speed.

[0125] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0126] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0127] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0128] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0129] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0130] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0131] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0132] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0133] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0134] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0135] 1) A control method for starting an engine of the present application comprises: during the process of starting a range extender system, and when it is determined that the engine speed is zero, controlling the small piston of the decompression rocker arm of the engine valve mechanism to extend, the range extender system comprises an engine, an integrated starter motor and an engine valve mechanism, when the small piston of the decompression rocker arm is extended, the small piston of the decompression rocker arm contacts the valve of the engine valve mechanism, and is used to decompress the engine compression cylinder; when it is determined that the small piston of the decompression rocker arm is extended, power is supplied to the integrated starter motor to reverse the engine with the integrated starter motor to increase the engine speed, and when it is detected that the engine speed is greater than a first preset engine speed, controlling the small piston of the decompression rocker arm to retract; when it is detected that the engine speed is greater than a second preset engine speed, controlling the engine fuel injection ignition, and when the engine ignition is successful, adjusting the torque of the integrated starter motor according to the preset torque unloading strategy, and completing the engine starting when the torque of the integrated starter motor is adjusted to the preset torque, wherein the second preset engine speed is greater than the first preset engine speed. By controlling the exhaust valve to open during the compression stroke and expansion stroke and releasing the compression pressure in the cylinder to achieve decompression starting, the range extender starts quickly and smoothly, improving the NVH comfort of the vehicle and reducing energy consumption. This solves the problem of engine shaking during the engine reverse dragging stage of the starter-generator motor during the starting process of the existing range extender, which causes comfort to the vehicle's drivers and passengers.

[0136] 2) A control device for starting an engine of the present application comprises: a first control unit, which is used to control the extension of a small piston of a decompression rocker arm of an engine valve mechanism during the process of starting a range extender system and when it is determined that the engine speed is zero, the range extender system comprises an engine, an integrated starter motor and an engine valve mechanism, when the small piston of the decompression rocker arm is extended, the small piston of the decompression rocker arm contacts a valve of the engine valve mechanism, and is used to decompress the engine compression cylinder; a second control unit, which is used to supply power to the integrated starter motor when it is determined that the small piston of the decompression rocker arm is extended, so as to reversely drag the engine with the integrated starter motor to increase the engine speed, and when it is detected that the engine speed is greater than a first preset engine speed, control the small piston of the decompression rocker arm to retract; a third control unit, which is used to control the engine injection ignition when it is detected that the engine speed is greater than a second preset engine speed, and when the engine ignition is successful, adjust the torque of the integrated starter motor according to a preset torque unloading strategy, and complete the engine starting when the torque of the integrated starter motor is adjusted to the preset torque, wherein the second preset engine speed is greater than the first preset engine speed. By controlling the exhaust valve to open during the compression stroke and expansion stroke and releasing the compression pressure in the cylinder to achieve decompression starting, the range extender starts quickly and smoothly, improving the NVH comfort of the vehicle and reducing energy consumption. This solves the problem of engine shaking during the engine reverse dragging stage of the starter-generator motor during the starting process of the existing range extender, which causes comfort to the vehicle's drivers and passengers.

[0137] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for controlling engine starting, characterized in that: include: During the process of starting the range extender system, and when it is determined that the engine speed is zero, the small piston of the decompression rocker arm of the engine valve mechanism is controlled to extend, the range extender system includes an engine, a starter-in-one motor and the engine valve mechanism, when the small piston of the decompression rocker arm is extended, the small piston of the decompression rocker arm contacts the valve of the engine valve mechanism, so as to decompress the engine compression cylinder; When it is determined that the small piston of the decompression rocker arm is extended, power is supplied to the starting-integrated motor so as to reverse the engine by using the starting-integrated motor to increase the engine speed, and when it is detected that the engine speed is greater than a first preset engine speed, the small piston of the decompression rocker arm is controlled to retract; When it is detected that the engine speed is greater than a second preset engine speed, the engine fuel injection and ignition are controlled, and when the engine ignition is successful, the torque of the integrated starter motor is adjusted according to the preset torque unloading strategy, and when the torque of the integrated starter motor is adjusted to the preset torque, the engine starting is completed, wherein the second preset engine speed is greater than the first preset engine speed.

2. The method according to claim 1, characterized in that The method comprises: adjusting the torque of the starter-generator motor according to a preset torque unloading strategy, and completing the engine starting when the torque of the starter-generator motor is adjusted to the preset torque, including: Adjusting the torque of the starting-in-one motor to a first torque according to a step torque unloading strategy, wherein the step torque unloading strategy is a control strategy in which the torque decreases step by step over time; When it is determined that the torque of the starting-in-one motor reaches the first torque, a linear torque unloading strategy is adopted to adjust the torque of the starting-in-one motor to the preset torque, wherein the linear torque unloading strategy is a control strategy in which the torque is gradually reduced linearly over time; When it is determined that the torque of the starter-in-one motor reaches the preset torque, it is determined that the engine starting operation is completed.

3. The method according to claim 2, characterized in that When it is determined that the torque of the starting-starting motor reaches the first torque, a linear torque unloading strategy is adopted to adjust the torque of the starting-starting motor to the preset torque, including: In the case where it is determined that the torque of the starting-starting motor reaches the first torque, determining the running time for the torque of the starting-starting motor to reach the first torque; In the case where it is determined that the running time reaches a first preset time period, determining whether the torque fluctuation of the starting-in-one motor is less than a fluctuation setting value; When the torque fluctuation of the starting-and-starting motor is less than the fluctuation setting value, a linear torque unloading strategy is adopted to adjust the torque of the starting-and-starting motor to the preset torque.

4. The method according to claim 2, characterized in that: Before the linear torque unloading strategy is adopted to adjust the torque of the starting-in-one motor to the preset torque, the method further includes: Using the formula: Evaluate the speed fluctuation stability of the engine, where λ is the speed fluctuation stability, ω max is the maximum speed fluctuation, ω min is the minimum value of speed fluctuation, ω m Preset differential for speed fluctuations; Whether to adopt the linear torque unloading strategy to adjust the torque of the starting-in-one motor is determined according to the speed fluctuation stability.

5. The method according to claim 1, characterized in that: The method further comprises: Determining the first preset engine speed according to the ambient temperature, altitude, coolant temperature, oil temperature, motor rotor moment of inertia, motor efficiency curve and vehicle battery power; The second preset engine speed is determined according to the ambient temperature, the altitude, the coolant temperature, the engine oil temperature, the engine air intake amount and the fuel injection amount.

6. The method according to claim 1, characterized in that When it is detected that the engine speed is greater than a first preset engine speed, the small piston of the decompression rocker arm is controlled to retract, comprising: detecting the engine speed after a second preset time period; When the engine speed is greater than the first preset engine speed, the small piston of the decompression rocker arm is controlled to retract.

7. The method according to claim 6, characterized in that The method further comprises: The second preset time period is determined according to the ambient temperature, the altitude, the coolant temperature and the engine oil temperature.

8. An engine starting control device, characterized in that: include: a first control unit, for controlling the extension of a small piston of a decompression rocker arm of an engine valve mechanism during the start-up of the range extender system and when it is determined that the engine speed is zero, wherein the range extender system comprises an engine, a starter-integrated motor and the engine valve mechanism, and when the small piston of the decompression rocker arm is extended, the small piston of the decompression rocker arm contacts a valve of the engine valve mechanism to decompress the engine compression cylinder; A second control unit is used for, when determining that the small piston of the decompression rocker arm is extended, supplying power to the starting-integrated motor so as to reversely drag the engine with the starting-integrated motor to increase the engine speed, and when detecting that the engine speed is greater than a first preset engine speed, controlling the small piston of the decompression rocker arm to retract; A third control unit is used to control the engine fuel injection and ignition when it is detected that the engine speed is greater than a second preset engine speed, and when the engine ignition is successful, adjust the torque of the integrated starter motor according to a preset torque unloading strategy, and complete the engine starting when the torque of the integrated starter motor is adjusted to the preset torque, wherein the second preset engine speed is greater than the first preset engine speed.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the engine start control method according to any one of claims 1 to 7.

10. An electronic device, characterized in that: include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include a control method for executing the engine start described in any one of claims 1 to 7.

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