Vehicle, engine starting control method and device and medium

Abstract

The invention discloses a vehicle, an engine starting control method and device and a medium, and the method comprises the steps that in the process that a generator drags an engine to start, the current output torque of the generator is recognized; if the current output torque of the generator is smaller than a set torque threshold value, when the rotating speed of the engine reaches a set oil injection rotating speed threshold value, the engine is controlled to conduct oil injection ignition, and the torque threshold value is the minimum torque needed by the generator for dragging the rotating speed of the engine to the starting completion rotating speed; the oil injection rotating speed threshold value is the corrected initial rotating speed corresponding to oil injection ignition of the engine, the oil injection rotating speed threshold value is smaller than the initial oil injection rotating speed threshold value, and the initial oil injection rotating speed threshold value is the corrected initial rotating speed corresponding to oil injection ignition of the engine when the output torque of the generator is larger than or equal to the torque threshold value. The starting success rate of the engine can be increased, and therefore the vehicle starting performance is improved.

Description

Technical Field

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

[0002] With the technological development of hybrid vehicles, the P1 motor has replaced the function of the traditional starter. The P1 motor is used to output torque to quickly drag the engine to a higher speed to start the engine. Therefore, the output torque capacity of the P1 motor will affect whether the engine can be successfully started. When the torque of the P1 motor is limited, it may not be able to quickly drag the engine to the required target speed, resulting in engine start failure or failure to start for the first time and requiring multiple starts. Summary of the invention

[0003] The embodiments of the present application provide a vehicle and an engine start control method, device and medium, which can improve the engine start success rate to at least a certain extent, thereby improving the vehicle start performance.

[0004] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

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

[0006] During the process of starting the engine by driving the generator, identifying the current output torque of the generator;

[0007] If the current output torque of the generator is less than a set torque threshold, then when the engine speed reaches a set injection speed threshold, the engine is controlled to perform injection ignition, wherein the torque threshold is the minimum torque required for the generator to drag the engine speed to the starting completion speed, the injection speed threshold is the corrected starting speed corresponding to the engine for injection ignition, the injection speed threshold is less than the initial injection speed threshold, and the initial injection speed threshold is the pre-corrected starting speed corresponding to the engine for injection ignition when the output torque of the generator is greater than or equal to the torque threshold.

[0008] In some embodiments of the present application, based on the above scheme, controlling the engine to perform fuel injection ignition includes:

[0009] obtaining a current atmospheric pressure and a current coolant temperature of the engine;

[0010] Determining a target output torque corresponding to the current atmospheric pressure and the current coolant temperature according to a set corresponding relationship;

[0011] The engine is controlled to perform fuel injection and ignition to achieve the target output torque.

[0012] In some embodiments of the present application, based on the above solution, determining the target output torque corresponding to the current atmospheric pressure and the current coolant temperature according to the set corresponding relationship includes:

[0013] Acquire a set mapping relationship table, wherein the mapping relationship table records a plurality of intake air amounts, and an atmospheric pressure and a coolant temperature corresponding to each intake air amount, wherein the coolant temperature is negatively correlated with the intake air amount;

[0014] Traversing the mapping relationship table to determine a target intake air volume corresponding to the current atmospheric pressure and the current coolant temperature;

[0015] The target output torque is determined according to a set linear correspondence relationship between the target intake air volume and the target output torque.

[0016] In some embodiments of the present application, based on the above solution, after controlling the engine to perform fuel injection and ignition, the method further includes:

[0017] The generator is controlled to continue to drag the engine according to the current output torque, so as to increase the speed of the engine to the starting completion speed based on the drive of the engine's fuel injection ignition and the drag of the engine by the generator.

[0018] In some embodiments of the present application, based on the above solution, after controlling the engine to perform fuel injection and ignition, the method further includes:

[0019] The power battery is controlled to increase the discharge power within a preset time period so that the current output torque of the generator is greater than the torque threshold, and the engine speed is increased to a target speed, wherein the target speed is greater than an upper limit value of a resonance speed range between the engine and the hybrid transmission.

[0020] In some embodiments of the present application, based on the above solution, the controlling the power battery to increase the discharge power within a preset time period includes:

[0021] Obtaining a total output torque required by the generator to drive the engine from the injection speed threshold to the target speed;

[0022] Determining the total discharge power required by the power battery within the preset time length and the corresponding instantaneous discharge power per unit time length according to the total output torque;

[0023] The power battery is controlled to supply power to the generator according to the instantaneous discharge power.

[0024] In some embodiments of the present application, based on the above solution, the identifying the current output torque of the generator includes:

[0025] If the vehicle is in a stationary state, the current output torque of the generator is identified.

[0026] According to a second aspect of an embodiment of the present application, there is provided an engine start control device, comprising:

[0027] An identification unit, used to identify the current output torque of the generator during the process of the generator driving the engine to start;

[0028] A control unit, for controlling the engine to perform fuel injection ignition when the engine speed reaches a set fuel injection speed threshold if the current output torque of the generator is less than a set torque threshold, wherein the torque threshold is the minimum torque required for the generator to drag the engine speed to the starting completion speed, the fuel injection speed threshold is the corrected starting speed corresponding to the engine for fuel injection ignition, the fuel injection speed threshold is less than the initial fuel injection speed threshold, and the initial fuel injection speed threshold is the pre-corrected starting speed corresponding to the engine for fuel injection ignition when the output torque of the generator is greater than or equal to the torque threshold.

[0029] According to a third aspect of an embodiment of the present application, a computer-readable storage medium is provided, in which at least one computer program instruction is stored. The at least one computer program instruction is loaded and executed by a processor to implement the operations performed by any method described in the first aspect.

[0030] According to a fourth aspect of an embodiment of the present application, a vehicle is provided, comprising one or more processors and one or more memories, wherein at least one program code is stored in the one or more memories, and the at least one program code is loaded and executed by the one or more processors to implement the operations performed by any of the methods described in the first aspect.

[0031] One or more technical solutions provided by the embodiments of the present invention achieve at least the following technical effects or advantages:

[0032] In the present application, during the process of the generator dragging the engine to start, the current output torque of the generator is identified; if the current output torque of the generator is less than the set torque threshold, when the engine speed reaches the set injection speed threshold, the engine is controlled to perform injection ignition, wherein the torque threshold is the minimum torque required for the generator to drag the engine speed to the start completion speed, the injection speed threshold is the corrected starting speed corresponding to the engine injection ignition, the injection speed threshold is less than the initial injection speed threshold, and the initial injection speed threshold is the corrected starting speed corresponding to the engine injection ignition when the output torque of the generator is greater than or equal to the torque threshold. Therefore, when the output torque of the generator is limited, the present application reduces the injection speed threshold of the engine so that the engine is ignited in advance to increase the engine speed to the start completion speed, thereby improving the engine start success rate when the generator output torque is limited, thereby improving the vehicle's starting performance.

[0033] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0035] Figure 1 A flow chart showing an engine start control method according to an embodiment of the present application;

[0036] Figure 2 A speed variation curve diagram of the engine of the embodiment of the present application when driving through the resonance speed zone is shown;

[0037] Figure 3 A curve diagram showing the change in engine speed after the motor borrows power according to an embodiment of the present application is shown;

[0038] Figure 4 A structural diagram of an engine start control device according to an embodiment of the present application is shown;

[0039] Figure 5 A schematic diagram of the structure of a computer system of a vehicle suitable for implementing an embodiment of the present application is shown. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions 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 are within the scope of protection of this application.

[0041] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0042] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0043] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0044] It should also 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 sequence. It should be understood that the objects used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those shown or described.

[0045] With the development of hybrid vehicle technology, the P1 motor has replaced the function of the traditional starter. The P1 motor is located in the sun gear of the planetary gear set, and the engine is located in the planetary carrier. The transmission path from the P1 motor to the engine is: P1 motor-planetary carrier-torque limiting shock absorber-engine. The P1 motor can make the engine's transmission efficiency high, assist the engine start and stop, provide power assistance for the engine, improve vehicle torque, increase driving experience, and achieve kinetic energy recovery. Therefore, the output torque capacity of the P1 motor will affect whether the engine can be successfully started. When the torque of the P1 motor is limited, for example, the ambient temperature is low, resulting in limited discharge power of the power battery, and then the torque of the P1 motor is limited, it may not be possible to quickly drag the engine to the required target speed, resulting in engine start failure or failure to start for the first time and requiring multiple starts.

[0046] Based on this, in order to improve the success rate of engine starting, the embodiment of the present application proposes an engine starting control method, which can improve the success rate of engine starting to a certain extent when the generator output torque is limited, thereby improving the starting performance of the vehicle.

[0047] The engine start control method of the embodiment of the present application will be described below with reference to specific drawings.

[0048] See also Figure 1 , shows a flow chart of an engine start control method according to an embodiment of the present application.

[0049] According to a first aspect of an embodiment of the present application, an engine start control method is provided, which can be executed in a vehicle controller, and the method is implemented by steps S1-S2, including but not limited to:

[0050] Step S1. During the process of the generator dragging the engine to start, identifying the current output torque of the generator;

[0051] It is understandable that when the ambient temperature is low, for example, when the ambient temperature is lower than -30 degrees, the discharge power of the power battery will be limited, which will in turn lead to the limitation of the output torque of the generator powered by the power battery during the engine starting process. Therefore, in the process of the generator dragging the engine to start, the current output torque of the generator can be identified to provide a data basis for the subsequent adoption of different engine starting control strategies.

[0052] For example: when the engine coolant temperature is lower than a certain threshold, the SOC (State Of Charge) of the power battery is lower than a certain threshold, or the discharge power of the power battery is lower than a certain threshold, it can be considered that the current output torque of the generator is limited, wherein the above thresholds can be calibrated according to different vehicle-mounted products and are not limited here.

[0053] It should be noted that during the driving process, due to the increase in the temperature in the passenger compartment and other measures, the discharge power of the power battery and the engine coolant temperature are no longer affected by the low temperature of the environment; when the vehicle is started in the stationary state, the discharge power of the power battery and the engine coolant temperature are usually affected by the low temperature of the environment, thereby affecting the output torque capacity of the generator. Therefore, the main application scenario of the engine start control method of the embodiment of the present application is in the stationary state.

[0054] In some embodiments of the present application, based on the above solution, the identifying the current output torque of the generator includes:

[0055] If the vehicle is in a stationary state, the current output torque of the generator is identified.

[0056] Step S2. If the current output torque of the generator is less than the set torque threshold, then when the engine speed reaches the set injection speed threshold, the engine is controlled to perform injection ignition, wherein the torque threshold is the minimum torque required for the generator to drag the engine speed to the starting completion speed, the injection speed threshold is the corrected starting speed corresponding to the engine for injection ignition, the injection speed threshold is less than the initial injection speed threshold, and the initial injection speed threshold is the pre-corrected starting speed corresponding to the engine for injection ignition when the output torque of the generator is greater than or equal to the torque threshold.

[0057] It is understandable that, assuming that the minimum torque (torque threshold) required for the generator to drag the engine speed to complete the start is 100 Nm, that is, the output torque of the generator should be greater than or equal to 100 Nm to drag the engine to start. During the engine start-up phase, the generator is discharged through the power battery. Therefore, there is a corresponding relationship between the discharge power of the power battery and the output torque of the generator. Whether the output torque of the generator can reach the torque threshold can also be reflected by the discharge power of the power battery.

[0058] If the discharge power of the power battery is not limited (for example, greater than or equal to 15 kilowatts), the output torque of the generator can be greater than or equal to the torque threshold (for example, 100 Nm), and the generator drags the engine to a higher start-up completion speed (or idle speed). Under normal circumstances, after the engine reaches the start-up completion speed, fuel injection ignition is performed, so that the engine can work more efficiently and save energy. Among them, the initial fuel injection speed threshold can be the same as or different from the start-up completion speed (for example, slightly greater than the start-up completion speed). In some embodiments, the same initial fuel injection speed threshold as the start-up completion speed is used, such as 1000rpm, 800rpm, 600rpm, etc.

[0059] If the discharge power of the power battery is limited (for example, less than 15 kilowatts), the output torque of the generator is less than the torque threshold (for example, 100 Nm). In this case, although the generator can drag the engine to a certain speed, such as 500rpm, 400rpm, 300rpm, etc., the engine cannot be dragged to the starting completion speed, such as 1000rpm, 800rpm, 600rpm, etc., coupled with the influence of environmental factors such as extremely low temperature and poor fuel atomization performance, the engine may fail to start.

[0060] On the basis of the above, when the embodiment of the present application identifies that the output torque of the generator is limited, a control strategy of lowering the injection speed threshold (that is, the injection speed threshold is less than the initial injection speed threshold, for example, the injection speed threshold is 1 / 2, 2 / 3, etc. of the initial injection speed threshold) is adopted. When the engine speed reaches the injection speed threshold (for example, 500rpm, 400rpm, 300rpm), the engine is controlled to perform injection ignition in advance, so that the engine can reach the starting completion speed by utilizing the drive of the engine and the drag of the generator, thereby improving the engine starting success rate when the output torque of the generator is limited, thereby improving the starting performance of the vehicle.

[0061] In some embodiments of the present application, based on the above scheme, controlling the engine to perform fuel injection ignition includes:

[0062] Step S21. Obtaining the current atmospheric pressure and the current coolant temperature of the engine;

[0063] Among them, the current atmospheric pressure can be obtained through the vehicle-mounted air pressure sensor, and the current coolant temperature of the engine can be obtained through the vehicle-mounted temperature sensor.

[0064] Step S22. Determine the target output torque of the engine corresponding to the current atmospheric pressure and the current coolant temperature according to the set corresponding relationship;

[0065] In some embodiments of the present application, determining the target output torque of the engine corresponding to the current atmospheric pressure and the current coolant temperature according to the set corresponding relationship includes:

[0066] Step S221. Obtain a set mapping relationship table, wherein the mapping relationship table records a plurality of intake air volumes, and the atmospheric pressure and coolant temperature corresponding to each intake air volume, wherein the coolant temperature is negatively correlated with the intake air volume;

[0067] For example: The following table shows the corresponding intake volume under different coolant temperatures and different atmospheric pressures. It can be seen from the table that the lower the coolant temperature, the greater the intake volume, and the higher the coolant temperature, the smaller the intake volume.

[0068]

[0069] Step S222: traverse the mapping relationship table to determine the target intake air volume corresponding to the current atmospheric pressure and the current coolant temperature;

[0070] For example, if the current atmospheric pressure is 60KPa (kilopascals), the current coolant temperature is -30°C, and the corresponding target air intake volume is 3000 (m 3 / h, cubic meters per hour); or, the current atmospheric pressure is 75KPa, the current coolant temperature is -20℃, and the corresponding target air intake volume is 727 (m 3 / h).

[0071] Step S223: Determine the target output torque according to the linear correspondence relationship set between the target intake volume and the target output torque.

[0072] It can be understood that there is a linear correspondence between the target intake volume and the target output torque. The larger the target intake volume, the larger the target output torque. Then, from the above table, when the atmospheric pressure is constant, the lower the coolant temperature, the larger the corresponding intake volume, and the larger the target output torque.

[0073] Step S23: Control the engine to perform fuel injection and ignition to achieve the target output torque.

[0074] It is understandable that due to the negative correlation between the coolant temperature and the intake volume, that is, the negative correlation between the coolant temperature and the target output torque of the engine, then, in a low temperature environment, the target output torque of the engine needs to be set larger, that is, the engine output torque should be as large as possible when the engine is injected and ignited, so that the engine's upward speed during the starting phase is increased, and the temperature of the engine combustion chamber can be quickly increased to facilitate engine combustion, increase the probability of successful vehicle starting, achieve safe and reliable starting of the vehicle, and make up for the problem of starting difficulty or starting failure when the motor starting assist torque is insufficient.

[0075] It is understandable that during the engine starting process, the coolant temperature, atmospheric pressure, etc. may change. Therefore, when the coolant temperature and atmospheric pressure change, the corresponding intake volume and target output torque also need to be adjusted to better meet the actual environmental requirements of the engine. Among them, the intake volume can be expressed by the starting mean indicated effective pressure, and the mean indicated effective pressure determines the overshoot of the speed during the starting process.

[0076] In some embodiments, when controlling the engine to perform fuel injection ignition, it also includes:

[0077] The fuel control mode is determined according to the running state of the engine. If the engine is in the starting process, it is in the starting fuel control state; after the start is completed, it enters the post-start fuel control state. During cold start, the temperature of the combustion chamber wall and the cylinder wall is low. At this time, a large part of the fuel injected by the injector will be deposited on the wall to form an oil film. In order to ensure the concentration of the combustible mixture entering the cylinder, the fuel loss is compensated by increasing the injection amount. After the start is completed, as the engine ignites and burns, the temperature of the combustion chamber gradually rises, and the oil film loss gradually decreases, and the injection needs to be attenuated.

[0078] In some embodiments, when controlling the engine to perform fuel injection ignition, it also includes:

[0079] Set the ignition advance angle 5-13 degrees before compression top dead center.

[0080] It is understandable that the engine start ignition angle is affected by factors such as engine coolant and speed signal (the difference between engine speed and target speed). In order to facilitate stable engine start, the ignition advance angle is usually set 5-13° before compression top dead center.

[0081] In some embodiments, after controlling the engine to perform fuel injection and ignition, the method further includes:

[0082] The generator is controlled to continue to drag the engine according to the current output torque, so as to increase the speed of the engine to the starting completion speed based on the drive of the engine's fuel injection ignition and the drag of the engine by the generator.

[0083] Therefore, after the engine speed reaches the injection speed threshold, the generator continues to drag the engine according to the output torque it can currently provide (for example, 100 Nm, 50 Nm, etc.). At the same time, the engine is driven by its own injection ignition, so that the engine speed can be increased to the starting completion speed more quickly.

[0084] In some embodiments, based on the above solution, after controlling the engine to perform fuel injection and ignition, the method further includes:

[0085] Step S3. Control the power battery to increase the discharge power within a preset time period so that the current output torque of the generator is greater than the torque threshold, and the engine speed is increased to a target speed, wherein the target speed is greater than an upper limit value of a resonance speed range between the engine and the hybrid transmission.

[0086] For example: the original discharge power of the power battery is 5-10 kilowatts. By controlling the power battery to borrow power from the generator for a short period of 2 seconds (for example, the discharge power is increased to 15 kilowatts), the generator can quickly drag the engine to the target speed to avoid staying in the resonant speed range and affecting the vehicle's NVH performance.

[0087] See also Figure 2 , shows a speed variation curve diagram of the engine of an embodiment of the present application when driving through the resonance speed zone.

[0088] exist Figure 2 It can be seen that in low temperature environment, the fuel atomization of the engine is poor. When the engine is not completely burned and accompanied by misfire, the generator continues to drag the engine (for example, the engine speed is maintained at 300rpm, 400rpm, etc.), and the starting drag speed of the generator for the engine is in the assembly resonant speed range (for example, 300-450rpm). Therefore, if the engine is continuously in this resonant speed range, the engine speed will fluctuate violently, the gears at the connection between the engine and the generator shaft will collide, and the gearbox will produce gear knocking sound and obvious "clang clang" sound, thereby affecting the vehicle's NVH (Noise, Vibration, Harshness) performance and user experience.

[0089] In addition, if the engine is ignited after the generator drags the engine to the injection ignition speed threshold (300rpm), and the engine starts the engine through its own injection ignition to increase the engine speed from the injection ignition speed threshold to the start completion speed (600rpm), it will still pass through the resonant speed range, and usually stay in this range for a long time, such as about 4 seconds. During these 4 seconds, the engine speed fluctuates violently, and the gears at the connection between the engine and the generator shaft collide, causing the gearbox to knock and produce obvious "clang clang" sounds, which also affect the vehicle's NVH (Noise, Vibration, Harshness) performance and user experience.

[0090] See also Figure 3 , shows a curve diagram of the engine speed change after the motor borrows power in an embodiment of the present application.

[0091] Depend on Figure 3It can be seen that when the motor torque is limited, the generator borrows electricity from the power battery for a short time, for example, the power battery briefly increases the discharge power within 2 seconds, so that the engine speed can be increased from the injection speed threshold to the target speed, for example, to 480rpm. Since the target speed is greater than the resonant speed range, and the speed increase rate of the generator dragging the engine is much greater than the speed increase rate of the engine itself, the resonant speed range can be quickly crossed (for example, 0.1-0.2 seconds to cross the resonant speed range), thereby avoiding the problem of gear collision at the connection between the engine and the generator shaft caused by the resonant speed range, resulting in gear knocking, thereby improving the vehicle's NVH performance and user experience.

[0092] In some embodiments, based on the above solution, the control of the power battery to increase the discharge power within a preset time period includes:

[0093] Step S31. Obtaining the total output torque required for the generator to drive the engine from the injection speed threshold to the target speed;

[0094] For example: the injection speed threshold is 300rpm, the target speed is 600rpm, the generator operates at an output torque of 60Nm, and the total output torque required to drag the engine from 300 to 600rpm is 300Nm.

[0095] Step S32: determining the total discharge power required by the power battery within the preset time period and the corresponding instantaneous discharge power within the unit time period according to the total output torque;

[0096] For example: when the total output torque is 300 Nm, the total discharge power required by the power battery within 2 seconds is 30 kW, and the instantaneous discharge power corresponding to the unit time (for example, 1 second) is 15 kW.

[0097] Step S33: Control the power battery to supply power to the generator according to the instantaneous discharge power.

[0098] For example: control the power battery to supply power to the generator at a discharge power of 15 kilowatts within 2 seconds.

[0099] Based on the above disclosed content, on the one hand, when the output torque of the generator is identified to be limited, the embodiment of the present disclosure adopts a control strategy of reducing the injection speed threshold (that is, the injection speed threshold is less than the initial injection speed threshold). When the engine speed reaches the injection speed threshold (for example, 500rpm, 400rpm, 300rpm), the engine is controlled to perform injection ignition in advance, so that the engine can reach the start completion speed by using the drive of the engine and the drag of the generator, so that the engine start success rate can be improved when the output torque of the generator is limited, thereby improving the starting performance of the vehicle; on the other hand, in a low temperature environment, by increasing the target output torque of the engine, the engine's upward speed is increased during the start phase, and the engine combustion chamber can quickly increase the temperature, which is conducive to engine combustion, and the vehicle start success probability is increased, thereby achieving safe and reliable starting of the vehicle, and compensating for the problem of starting difficulty or starting failure when the motor starting assist torque is insufficient; on the other hand, when the motor torque is limited, by borrowing power from the power battery for a short time, the engine speed quickly passes through the resonance speed area, thereby avoiding the problem of gear collision at the connection between the engine and the generator shaft caused by the resonance speed area, and generating gear knocking noise of the gearbox, thereby improving the NVH performance of the vehicle and improving the user experience.

[0100] See also Figure 4 , shows a structural diagram of an engine starting control device according to an embodiment of the present application.

[0101] According to a second aspect of an embodiment of the present application, an engine start control device 200 is provided, comprising:

[0102] An identification unit 201 is used to identify the current output torque of the generator during the process of the generator driving the engine to start;

[0103] The control unit 202 is used to control the engine to perform fuel injection ignition when the engine speed reaches a set fuel injection speed threshold if the current output torque of the generator is less than a set torque threshold, wherein the torque threshold is the minimum torque required for the generator to drag the engine speed to the starting completion speed, the fuel injection speed threshold is the corrected starting speed corresponding to the engine for fuel injection ignition, the fuel injection speed threshold is less than the initial fuel injection speed threshold, and the initial fuel injection speed threshold is the pre-corrected starting speed corresponding to the engine for fuel injection ignition when the output torque of the generator is greater than or equal to the torque threshold.

[0104] According to a third aspect of an embodiment of the present application, a computer-readable storage medium is provided, in which at least one computer program instruction is stored. The at least one computer program instruction is loaded and executed by a processor to implement the operations performed by any method described in the first aspect.

[0105] The computer readable storage medium may be a portable compact disk read-only memory (CD-ROM) and include program code, and may be run on a terminal device, such as a personal computer. However, the computer readable storage medium of the present application is not limited thereto, and in the present application, the readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, apparatus, or device.

[0106] The readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection with one or more conductors, a portable 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 thereof.

[0107] Program code for performing the operations of the present application may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0108] According to a fourth aspect of an embodiment of the present application, a vehicle is provided, comprising one or more processors and one or more memories, wherein at least one program code is stored in the one or more memories, and the at least one program code is loaded and executed by the one or more processors to implement the operations performed by any of the methods described in the first aspect.

[0109] See also Figure 5 , which is a schematic diagram of the structure of a computer system of a vehicle suitable for implementing an embodiment of the present application.

[0110] According to a fourth aspect of an embodiment of the present application, a vehicle is provided, comprising one or more processors and one or more memories, wherein at least one program code is stored in the one or more memories, and the at least one program code is loaded and executed by the one or more processors to implement operations performed by any method of the first aspect.

[0111] like Figure 5 As shown, the vehicle 400 is represented in the form of a general computing device. The components of the vehicle 400 may include, but are not limited to: at least one processing unit 410, at least one storage unit 420, and a bus 430 connecting different system components (including the storage unit 420 and the processing unit 410).

[0112] The storage unit stores program codes, which can be executed by the processing unit 410, so that the processing unit 410 executes the steps described in the above “Embodiment Method” section of this specification according to various exemplary implementations of the present application.

[0113] The storage unit 420 may include a readable medium in the form of a volatile storage unit, such as a random access memory unit (RAM) 421 and / or a cache memory unit 422 , and may further include a read-only memory unit (ROM) 423 .

[0114] The storage unit 420 may also include a program / utility 424 having a set (at least one) of program modules 425, such program modules 425 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0115] Bus 430 may represent one or more of several types of bus structures, including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

[0116] The vehicle 400 may also communicate with one or more external devices 500 (e.g., keyboards, pointing devices, Bluetooth devices, etc.), one or more devices that enable a user to interact with the vehicle 400, and / or any device that enables the vehicle 400 to communicate with one or more other computing devices (e.g., routers, modems, etc.). Such communication may be performed via an input / output (I / O) interface 450. Furthermore, the vehicle 400 may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via a network adapter 460. As shown, the network adapter 460 communicates with other modules of the vehicle 400 via a bus 430. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the vehicle 400, including, but not limited to, microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0117] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on a computer-readable medium or transmitted via a computer-readable medium. Other examples and implementations are within the scope and spirit of the present invention and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these. In addition, each functional unit may be integrated into a processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit.

[0118] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0119] The units described as separate components may or may not be physically separated, and the components of the control device may or may not be physical units, that is, they may be located in one place or distributed in multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0120] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the methods of various embodiments of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-On l yMemory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk, etc., various media that can store program codes.

[0121] The above description is only an 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 substitution, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. An engine start control method, characterized in that: include: During the process of starting the engine by driving the generator, identifying the current output torque of the generator; If the current output torque of the generator is less than a set torque threshold, then when the engine speed reaches a set injection speed threshold, the engine is controlled to perform injection ignition, wherein the torque threshold is the minimum torque required for the generator to drag the engine speed to the starting completion speed, the injection speed threshold is the corrected starting speed corresponding to the engine for injection ignition, the injection speed threshold is less than the initial injection speed threshold, and the initial injection speed threshold is the pre-corrected starting speed corresponding to the engine for injection ignition when the output torque of the generator is greater than or equal to the torque threshold.

2. The method according to claim 1, characterized in that The controlling the engine to perform fuel injection ignition comprises: obtaining a current atmospheric pressure and a current coolant temperature of the engine; Determining a target output torque corresponding to the current atmospheric pressure and the current coolant temperature according to a set corresponding relationship; The engine is controlled to perform fuel injection and ignition to achieve the target output torque.

3. The method according to claim 2, characterized in that The step of determining the target output torque corresponding to the current atmospheric pressure and the current coolant temperature according to the set corresponding relationship includes: Acquire a set mapping relationship table, wherein the mapping relationship table records a plurality of intake air amounts, and an atmospheric pressure and a coolant temperature corresponding to each intake air amount, wherein the coolant temperature is negatively correlated with the intake air amount; Traversing the mapping relationship table to determine a target intake air volume corresponding to the current atmospheric pressure and the current coolant temperature; The target output torque is determined according to a set linear correspondence relationship between the target intake air volume and the target output torque.

4. The method according to claim 1, characterized in that: After controlling the engine to perform fuel injection and ignition, the method further includes: The generator is controlled to continue to drag the engine according to the current output torque, so as to increase the speed of the engine to the starting completion speed based on the drive of the engine's fuel injection ignition and the drag of the engine by the generator.

5. The method according to claim 1, characterized in that After controlling the engine to perform fuel injection and ignition, the method further comprises: The power battery is controlled to increase the discharge power within a preset time period so that the current output torque of the generator is greater than the torque threshold, and the engine speed is increased to a target speed, wherein the target speed is greater than an upper limit value of a resonance speed range between the engine and the hybrid transmission.

6. The method according to claim 5, characterized in that The controlling the power battery to increase the discharge power within a preset time period includes: Obtaining a total output torque required by the generator to drive the engine from the injection speed threshold to the target speed; Determining the total discharge power required by the power battery within the preset time length and the corresponding instantaneous discharge power per unit time length according to the total output torque; The power battery is controlled to supply power to the generator according to the instantaneous discharge power.

7. The method according to any one of claims 1 to 6, characterized in that: The identifying the current output torque of the generator includes: If the vehicle is in a stationary state, the current output torque of the generator is identified.

8. An engine starting control device, characterized in that: include: An identification unit, used to identify the current output torque of the generator during the process of the generator driving the engine to start; A control unit, for controlling the engine to perform fuel injection ignition when the engine speed reaches a set fuel injection speed threshold if the current output torque of the generator is less than a set torque threshold, wherein the torque threshold is the minimum torque required for the generator to drag the engine speed to the starting completion speed, the fuel injection speed threshold is the corrected starting speed corresponding to the engine for fuel injection ignition, the fuel injection speed threshold is less than the initial fuel injection speed threshold, and the initial fuel injection speed threshold is the pre-corrected starting speed corresponding to the engine for fuel injection ignition when the output torque of the generator is greater than or equal to the torque threshold.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores at least one computer program instruction, and the at least one computer program instruction is loaded and executed by a processor to implement the operations performed by any one of the methods according to claims 1-7.

10. A vehicle, characterized in that: The method comprises one or more processors and one or more memories, wherein at least one program code is stored in the one or more memories, and the at least one program code is loaded and executed by the one or more processors to implement the operations performed by the method according to any one of claims 1 to 7.

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