Vehicle, engine start control method, device and medium

Abstract

The application discloses a vehicle, an engine starting control method, device and medium. The method comprises the following steps: identifying the current output torque of the generator during the process of the generator dragging the engine starting; if the current output torque of the generator is less than a set torque threshold, controlling the engine to spray oil and ignite when the rotating speed of the engine reaches a set oil injection rotating speed threshold, wherein the torque threshold is the minimum torque required by the generator to drag the rotating speed of the engine to the starting completion rotating speed, the oil injection rotating speed threshold is the corrected initial rotating speed corresponding to the oil injection ignition of the engine, the oil injection rotating speed threshold is less than the initial oil injection rotating speed threshold, and the initial oil injection rotating speed threshold is the uncorrected initial rotating speed corresponding to the oil injection ignition of the engine when the output torque of the generator is greater than or equal to the torque threshold. The application can improve the starting success rate of the engine, thereby improving the starting performance of the vehicle.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of vehicle control, and particularly relates to a vehicle, an engine starting control method and device, and a medium. BACKGROUND

[0002] With the development of hybrid vehicle technology, a P1 motor replaces the function of a traditional starter motor. The P1 motor is used to output torque to quickly drag the engine to a high 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, the engine may not be quickly dragged to the required target speed, resulting in engine starting failure or the problem of multiple starting attempts for the first time. SUMMARY

[0003] Embodiments of the present application provide a vehicle, an engine starting control method and device, and a medium, thereby at least to some extent improving the starting success rate of the engine and thus improving the starting performance of the vehicle.

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

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

[0006] In the process of starting the engine by dragging the engine with a generator, the current output torque of the generator is identified;

[0007] If the current output torque of the generator is less than a set torque threshold, the engine is controlled to perform fuel injection ignition when the speed of the engine reaches a set fuel injection speed threshold, wherein the torque threshold is the minimum torque required by the generator to drag the speed of the engine to a starting completion speed, the fuel injection speed threshold is a corrected initial speed corresponding to the fuel injection ignition of the engine, the fuel injection speed threshold is less than an initial fuel injection speed threshold, and the initial fuel injection speed threshold is a pre-correction initial speed corresponding to the fuel injection ignition of the engine 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 foregoing scheme, the control of the engine to perform fuel injection ignition comprises:

[0009] The current atmospheric pressure and the current coolant temperature of the engine are obtained;

[0010] According to a set correspondence relationship, a target output torque corresponding to the current atmospheric pressure and the current coolant temperature is determined;

[0011] controlling the engine to perform fuel injection ignition to reach the target output torque.

[0012] In some embodiments of the present application, based on the foregoing scheme, the determining, according to the set correspondence, of the target output torque corresponding to the current atmospheric pressure and the current coolant temperature comprises:

[0013] obtaining a set mapping relationship table, the mapping relationship table recording a plurality of intake amounts, and atmospheric pressures and coolant temperatures corresponding to each of the intake amounts, wherein the coolant temperature is negatively correlated with the intake amount;

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

[0015] determining the target output torque according to a set linear correspondence between the target intake amount and the target output torque.

[0016] In some embodiments of the present application, based on the foregoing scheme, after controlling the engine to perform fuel injection ignition, the method further comprises:

[0017] controlling the generator 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 driving of the fuel injection ignition of the engine and the dragging of the generator to the engine.

[0018] In some embodiments of the present application, based on the foregoing scheme, after controlling the engine to perform fuel injection ignition, the method further comprises:

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

[0020] In some embodiments of the present application, based on the foregoing scheme, the controlling of the power battery to increase the discharge power within a preset time length comprises:

[0021] obtaining a total output torque required for the generator to drag the engine from the fuel injection speed threshold to the target speed;

[0022] determining, according to the total output torque, a total discharge power required for the power battery within the preset time length and a corresponding instantaneous discharge power per unit time;

[0023] controlling the power battery to supply power to the generator according to the instantaneous discharge power.

[0024] In some embodiments of the present application, based on the foregoing scheme, the identifying the current output torque of the generator comprises:

[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 the embodiments of the present application, an engine starting control device is provided, comprising:

[0027] An identifying unit is configured to identify a current output torque of the generator during the process of the generator dragging the engine to start;

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

[0029] According to a third aspect of the embodiments of the present application, a computer readable storage medium is provided, the computer readable storage medium stores at least one computer program instruction, the at least one computer program instruction is loaded and executed by a processor to implement the operations performed by the method according to any one of the first aspect.

[0030] According to a fourth aspect of the embodiments of the present application, a vehicle is provided, comprising one or more processors and one or more memories, the one or more memories store at least one program code, 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 the first aspect.

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

[0032] In the application, during the process of starting the engine by the generator dragging, the current output torque of the generator is identified; if the current output torque of the generator is less than the set torque threshold, the engine is controlled to be injected and ignited when the rotating speed of the engine reaches the set injection rotating speed threshold, wherein the torque threshold is the minimum torque required by the generator to drag the rotating speed of the engine to the starting completion rotating speed, the injection rotating speed threshold is the corrected initial rotating speed corresponding to the injection and ignition of the engine, the injection rotating speed threshold is less than the initial injection rotating speed threshold, and the initial injection rotating speed threshold is the uncorrected initial rotating speed corresponding to the injection and ignition of the engine 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 application reduces the injection rotating speed threshold of the engine, so that the engine is injected and ignited in advance to improve the rotating speed of the engine to the starting completion rotating speed, so that the starting success rate of the engine can be improved when the output torque of the generator is limited, and the starting performance of the vehicle is improved.

[0033] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the application. BRIEF DESCRIPTION OF DRAWINGS

[0034] The drawings incorporated into the specification and forming part of the specification, show embodiments consistent with the application, and together with the specification, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and other drawings can be obtained from these drawings without creative labor for those skilled in the art. In the drawings:

[0035] Figure 1 A flow chart of the engine starting control method of the embodiment of the application is shown;

[0036] Figure 2 A rotating speed change curve diagram of the engine driving through the resonance rotating speed area of the embodiment of the application is shown;

[0037] Figure 3 An engine rotating speed change curve diagram of the embodiment of the application after the motor borrowing electricity is shown;

[0038] Figure 4 A structure diagram of the engine starting control device of the embodiment of the application is shown;

[0039] Figure 5 A structure diagram of the computer system of the vehicle suitable for realizing the embodiment of the application is shown. DETAILED DESCRIPTION

[0040] With reference to the drawings and the embodiments described below, the technical solutions in the embodiments of the present application will be clearly and completely described, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0041] In addition, the described features, structures or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to give a full understanding of the embodiments of the present application. However, those skilled in the art will realize that the technical solutions of the present application can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. can be used. In other cases, well-known methods, devices, implementations or operations are not shown or described in detail to avoid obscuring the aspects of the present application.

[0042] The block diagrams shown in the drawings are only functional entities, which do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in the form of software, 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 drawings are only exemplary illustrations, which do not necessarily include all contents and operations / steps, and are not necessarily executed in the order described. For example, some operations / steps can be further decomposed, and some operations / steps can be combined or partially combined, so the actual execution order can be changed according to the actual situation.

[0044] It should be further noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the objects thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described.

[0045] With the development of hybrid vehicle technology, the P1 motor replaces the function of the traditional starter, the P1 motor is located in the sun gear of the planetary gear set, the engine is located in the planetary carrier, and the transmission path of the P1 motor to the engine is: P1 motor-planetary carrier-torque limiter shock absorber-engine. The P1 motor can make the transmission efficiency of the engine high, assist the engine start-stop, provide power assistance for the engine, improve the torque of the vehicle, increase the driving experience, and realize kinetic energy recovery. Therefore, the output torque capacity of the P1 motor will affect whether the engine can be successfully started. When the P1 motor torque is limited, for example, when the ambient temperature is low, the power battery discharge power is limited, and then the P1 motor torque is limited, the engine may not be able to be quickly dragged to the required target speed, resulting in engine start failure or the problem of multiple start attempts.

[0046] Based on this, in order to improve the starting success rate of the engine, the engine starting control method is provided in the embodiments of the present application, which can improve the starting success rate of the engine to a certain extent when the generator output torque is limited, and then improve the starting performance of the vehicle.

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

[0048] Referring to Figure 1 , a flowchart of the engine starting control method of the embodiments of the present application is shown.

[0049] According to a first aspect of the embodiments of the present application, an engine starting control method can be executed in a vehicle controller, and the method includes but is not limited to being implemented by steps S1-S2:

[0050] Step S1. In the process of dragging the engine to start by the generator, the current output torque of the generator is identified;

[0051] It can be understood 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, and then the output torque of the generator powered by the power battery during the engine starting process will be limited. Therefore, in the process of dragging the engine to start by the generator, the current output torque of the generator can be identified to provide a data basis for taking different engine starting control strategies subsequently.

[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-mentioned threshold can be calibrated according to different vehicle products, which is not limited here.

[0053] It should be noted that during driving, the discharge power of the power battery, the engine coolant temperature and the like are no longer affected by the low temperature environment due to the temperature rise in the passenger compartment and the like; when the vehicle is started in the original state, the discharge power of the power battery and the engine coolant temperature are usually affected by the low temperature environment, thereby affecting the output torque capability of the generator. Therefore, the engine starting control method of the embodiments of the present application is mainly applied to the original parking state.

[0054] In some embodiments of the present application, based on the foregoing scheme, the current output torque of the generator is identified, comprising:

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

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

[0057] It can be understood that, assuming that the minimum torque (torque threshold) required for the generator to drag the speed of the engine to the starting completion 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 complete the starting. In the engine starting stage, the generator is discharged by 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 kW), 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 starting completion speed (or idle speed). Generally, fuel injection is performed after the engine reaches the starting completion speed, thereby making the working efficiency of the engine higher and saving energy. The initial fuel injection speed threshold can be the same as or different from the starting completion speed (for example, slightly greater than the starting completion speed), in some embodiments, the initial fuel injection speed threshold is the same as the starting completion speed, for example, 1000 rpm, 800 rpm, 600 rpm, etc.

[0059] If the discharge power of the power battery is limited (for example, less than 15 kW), so that 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, for example, 500 rpm, 400 rpm, 300 rpm, etc., the engine cannot be dragged to the starting completion speed, for example, 1000 rpm, 800 rpm, 600 rpm, etc., plus the influence of environmental factors such as extremely low temperature and poor fuel atomization performance, which may cause the engine to fail to start.

[0060] On the basis of the above, when the output torque of the generator is identified to be limited, the control strategy of reducing the fuel injection speed threshold (that is, the fuel injection speed threshold is less than the initial fuel injection speed threshold, for example, the fuel injection speed threshold is 1 / 2, 2 / 3, etc. of the initial fuel injection speed threshold) is adopted, and when the speed of the engine reaches the fuel injection speed threshold (for example, 500 rpm, 400 rpm, 300 rpm), the engine is controlled to perform fuel injection ignition in advance, so that the engine can reach the starting completion speed by using the driving of the engine and the dragging of the generator, thereby improving the starting success rate of the engine when the output torque of the generator is limited, and further improving the starting performance of the vehicle.

[0061] In some embodiments of the present application, based on the foregoing scheme, the control of the engine to perform fuel injection ignition comprises:

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

[0063] Wherein, the current atmospheric pressure can be obtained by the air pressure sensor on the vehicle, and the current coolant temperature of the engine can be obtained by the temperature sensor on the vehicle.

[0064] Step S22. According to the set correspondence relationship, determine the target output torque corresponding to the engine determined by the current atmospheric pressure and the current coolant temperature;

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

[0066] Step S221. Obtain a set mapping relationship table, wherein the mapping relationship table records a plurality of intake amounts, and the atmospheric pressure and coolant temperature corresponding to each intake amount, wherein the coolant temperature and the intake amount are negatively correlated;

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

[0068]

[0069] Step S222. Traversing the mapping table to determine the target intake air amount corresponding to the current atmospheric pressure and the current coolant temperature;

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

[0071] Step S223. According to the linear correspondence relationship set between the target intake air amount and the target output torque, the target output torque is determined.

[0072] It can be understood that there is a linear correspondence relationship between the target intake air amount and the target output torque, and the greater the target intake air amount, the greater the target output torque. Then, according to the above table, when the atmospheric pressure is constant, the lower the coolant temperature, the greater the corresponding intake air amount, and the greater the target output torque.

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

[0074] It can be understood that, since the coolant temperature and the intake air amount are negatively correlated, i.e., the coolant temperature and the target output torque of the engine are negatively correlated, in a low-temperature environment, the target output torque of the engine needs to be set to be larger, i.e., when the engine performs fuel injection ignition, the output torque of the engine is made to reach a larger target output torque, so that the overspeed of the engine in the starting stage is improved, and the temperature of the engine combustion chamber can be quickly raised to facilitate engine combustion, improve the success probability of vehicle starting, realize safe and reliable starting of the vehicle, and solve the problem of difficult or failed starting when the motor starting assist torque is insufficient.

[0075] It can be understood that during the engine starting process, the coolant temperature, atmospheric pressure, etc. may change, so when the coolant temperature and atmospheric pressure change, the corresponding intake air amount and target output torque also need to be adjusted to better meet the actual environmental requirements of the engine. Among them, the intake air amount can be represented by the average indicated effective pressure, and the average indicated effective pressure determines the overspeed of the starting process.

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

[0077] The fuel control mode is determined according to the operating state of the engine. If the engine is in the starting process, the starting fuel control state is determined. After the starting is completed, the post-starting fuel control state is determined. When the engine is cold started, the temperature of the combustion chamber wall and the cylinder wall surface is low. At this time, a large part of the fuel injected by the fuel injector is deposited on the wall surface to form an oil film. In order to ensure the concentration of the combustible mixture entering the cylinder, the fuel injection amount is increased to compensate for the loss of fuel. After the starting is completed, the temperature of the combustion chamber gradually rises with the ignition and combustion of the engine, and the oil film loss gradually decreases. The fuel injection needs to be attenuated.

[0078] In some embodiments, when controlling the engine to perform the fuel injection ignition, the method further comprises:

[0079] The ignition advance angle is set to be 5-13 degrees before the compression top dead center.

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

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

[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 driving of the fuel injection ignition of the engine and the dragging of the generator to the engine.

[0083] Therefore, after the speed of the engine reaches the fuel injection speed threshold, the generator continues to drag the engine according to the output torque that can be currently provided (for example, 100 Nm, 50 Nm, etc.), and at the same time, the engine is driven based on the fuel injection ignition of the engine itself, so that the speed of the engine can be increased to the starting completion speed more quickly.

[0084] In some embodiments, based on the foregoing scheme, after controlling the engine to perform the fuel injection ignition, the method further comprises:

[0085] Step S3. The power battery is controlled to increase the discharge power within a preset time length, so that the current output torque of the generator is greater than the torque threshold, and the speed of the engine is dragged to increase to a target speed, wherein the target speed is greater than the upper limit value of the resonance speed interval of the engine and the hybrid transmission.

[0086] For example, the original discharge power of the power battery is 5-10 kW. By controlling the power battery to short-time borrow electricity from the generator (for example, the discharge power is increased to 15 kW) within 2 seconds, the generator can quickly drag the engine to the target speed to avoid staying in the resonance speed interval, which affects the NVH performance of the vehicle.

[0087] Referring to Figure 2 , a speed change curve diagram of the engine driving through the resonance speed interval is shown.

[0088] In Figure 2 , it can be seen that in a low temperature environment, the fuel atomization of the engine is poor, and in the case that the engine does not completely combust and is accompanied by misfire, the generator continuously drags the engine (for example, the speed of the engine is maintained at 300 rpm, 400 rpm, etc.), and the starting drag speed of the generator to the engine is in the assembly resonance speed interval (for example, 300-450 rpm). Therefore, if the engine continuously stays in this resonance speed interval, it will cause the engine speed to fluctuate sharply, the gears at the shaft connection of the engine and the generator will hit, the knocking sound of the gearbox will be produced, and the "ding ding" sound will be obvious, thereby affecting the NVH (Noise, Vibration, Harshness, noise, vibration and sound roughness) performance of the vehicle and the user experience.

[0089] In addition, if the engine performs fuel injection ignition when the generator drags the engine to the fuel injection ignition speed threshold (300 rpm), the engine speed will still pass through the resonance speed interval when the engine speed is increased from the fuel injection ignition speed threshold to the starting completion speed (600 rpm) through its own fuel injection ignition start, and usually stays in this interval for a long time, for example, about 4 seconds. Within these 4 seconds, the engine speed fluctuates sharply, the gears at the shaft connection of the engine and the generator hit, the knocking sound of the gearbox is produced, the "ding ding" sound is obvious, and the NVH (Noise, Vibration, Harshness, noise, vibration and sound roughness) performance of the vehicle is also affected, and the user experience is affected.

[0090] Referring to Figure 3 , an engine speed change curve diagram after the motor borrows electricity is shown.

[0091] By Figure 3It can be seen that when the motor torque is limited, the power battery is temporarily borrowed power by the generator, for example, the power battery temporarily increases the discharge power within 2 seconds, so that the engine speed can be increased from the fuel injection speed threshold to the target speed, for example, to 480 rpm. Since the target speed is greater than the resonance speed interval, and the speed increasing rate of the generator driving the engine is much greater than that of the engine itself, the resonance speed interval can be quickly crossed (for example, 0.1-0.2 seconds can cross the resonance speed interval), thereby avoiding the problem of gear impact at the shaft connection between the engine and the generator, producing the knocking sound of the gearbox, improving the NVH performance of the vehicle, and improving the user experience.

[0092] In some embodiments, based on the foregoing scheme, the control of the power battery to increase the discharge power within the preset time length comprises:

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

[0094] For example: the fuel injection speed threshold is 300 rpm, the target speed is 600 rpm, and the generator operates at an output torque of 60 newton-meters. The total output torque required for the engine to reach 600 rpm from 300 rpm is 300 newton-meters.

[0095] Step S32. Determine 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;

[0096] For example: when the total output torque is 300 newton-meters, the total discharge power required by the power battery within 2 seconds is 30 kilowatts, and the corresponding instantaneous discharge power per unit time length (for example, 1 second) is 15 kilowatts.

[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 disclosure, in one aspect, when it is identified that the output torque of the generator is limited, a control strategy of reducing the fuel injection speed threshold (i.e., the fuel injection speed threshold is less than the initial fuel injection speed threshold) is adopted, and when the speed of the engine reaches the fuel injection speed threshold (e.g., 500 rpm, 400 rpm, 300 rpm), the engine is controlled to perform fuel injection ignition in advance, so that the engine can reach the starting completion speed by using the driving of the engine and the dragging of the generator, thereby improving the starting success rate of the engine and the starting performance of the vehicle when the output torque of the generator is limited. In another aspect, in a low temperature environment, the target output torque of the engine is increased, so that the starting stage engine overspeed is improved, and the engine combustion chamber can quickly increase the temperature to facilitate engine combustion, improve the vehicle starting success probability, and achieve safe and reliable starting of the vehicle, thereby solving the problem of difficult or failed starting when the motor starting assist torque is insufficient. In yet another aspect, when the motor torque is limited, the power battery is temporarily borrowed to make the engine speed quickly pass through the resonance speed region, thereby avoiding the problem of gear impact at the shaft connection between the engine and the generator caused by the resonance speed region, improving the NVH performance of the vehicle, and improving the user experience.

[0100] Referring to Figure 4 , a structural diagram of an engine starting control device according to an embodiment of the present application is shown.

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

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

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

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

[0105] The computer-readable storage medium may be a portable compact disc read-only memory (CD-ROM) and include program code, and can 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. In the present application, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction 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 any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, 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] The program code for performing the operations of the present application can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, and the like, as well as conventional procedural programming languages ​​such as "C" or similar programming languages. The program code can be executed entirely on the user computing device, partially on the user device, as a stand-alone 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 cases involving a remote computing device, the remote computing device can 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 can 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 structural diagram of a computer system of a vehicle suitable for implementing an embodiment of the present application.

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

[0111] As shown in Figure 5 The components of vehicle 400 can include, but are not limited to, the at least one processing unit 410, the at least one memory unit 420, a bus 430 that connects the various system components, including the memory unit 420 and the processing unit 410.

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

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

[0114] The memory unit 420 can further include program / utility 424 having a set of the program modules 425, including but not limited to, an operating system, one or more application programs, other program modules, and program data, and each of these examples, or some combination thereof, can include implementation of a network environment.

[0115] The bus 430 can represent one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration bus, a processor or local bus using any of a variety of bus architectures, and the like.

[0116] The vehicle 400 can also communicate with one or more external devices 500 (e.g., a keyboard, pointing device, Bluetooth device, 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., a router, modem, etc.). Such communication can occur via an input / output (I / O) interface 450. Furthermore, the vehicle 400 can 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, other hardware and / or software modules can 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 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, hardwiring, or a combination of any of these. Furthermore, each functional unit may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single 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 exemplary. For example, the division of units can be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another 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 separate, 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 across multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0120] The integrated unit, if implemented in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application, essentially or in other words, the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store program codes.

[0121] The above only describes the embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles 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, the engine is controlled to perform fuel injection ignition when the speed of the engine reaches a set injection speed threshold, wherein the torque threshold is the minimum torque required for the generator to drag the speed of the engine to the starting completion speed, the injection speed threshold is the corrected starting speed corresponding to the engine performing fuel 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 performing fuel injection ignition when the output torque of the generator is greater than or equal to the torque threshold; After controlling the engine to perform fuel injection and ignition, the method further includes: 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 speed of the engine is increased to a target speed, wherein the target speed is greater than the upper limit of the resonant speed range between the engine and the hybrid transmission, and wherein the speed rate at which the generator drives the engine is greater than the speed increase rate of the engine itself.

2. The method according to claim 1, characterized in that The controlling the engine to perform fuel injection and ignition comprises: obtaining a current atmospheric pressure and a current coolant temperature of the engine; determining, according to a set corresponding relationship, a target output torque corresponding to the current atmospheric pressure and the current coolant temperature; 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 determining, according to the set corresponding relationship, the target output torque corresponding to the current atmospheric pressure and the current coolant temperature includes: Obtaining a set mapping relationship table, wherein the mapping relationship table records multiple 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; 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, wherein 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 driving of the engine's fuel injection ignition and the dragging of the engine by the generator.

5. The method according to claim 1, wherein 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 period and the corresponding instantaneous discharge power per unit time period according to the total output torque; The power battery is controlled to supply power to the generator according to the instantaneous discharge power.

6. The method according to any one of claims 1 to 5, 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.

7. An engine starting control device, characterized in that: include: an identification unit, configured to identify the current output torque of the generator during the process of starting the engine by driving the generator; a control unit, configured to control the engine to perform fuel injection ignition when the speed of the engine 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 a minimum torque required by the generator to drag the speed of the engine to a start-up completion speed, the fuel injection speed threshold is a corrected starting speed corresponding to the engine performing fuel injection ignition, the fuel injection speed threshold is less than an initial fuel injection speed threshold, and the initial fuel injection speed threshold is a pre-corrected starting speed corresponding to the engine performing fuel injection ignition when the output torque of the generator is greater than or equal to the torque threshold; After controlling the engine to perform fuel injection and ignition, the method further includes: 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 speed of the engine is increased to a target speed, wherein the target speed is greater than the upper limit of the resonant speed range between the engine and the hybrid transmission, and wherein the speed rate at which the generator drives the engine is greater than the speed increase rate of the engine itself.

8. 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 1-6.

9. 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 6.

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