Hybrid vehicle engine control method, vehicle and readable storage medium

Abstract

The embodiment of the present invention provides a hybrid vehicle engine control method, a vehicle and a readable storage medium, the hybrid vehicle engine control method includes obtaining engine rotation parameters and generator rotation parameters; determining the transmission ratio according to the generator rotation parameters and the engine rotation parameters; determining the first efficiency parameter according to the generator efficiency parameter, the generator rotation parameter and the transmission ratio; obtaining the fuel point parameter of the engine; determining the comprehensive fuel point parameter according to the first efficiency parameter and the fuel point parameter; determining the comprehensive isopower curve group according to the engine rotation parameters; determining the comprehensive engine working curve according to the comprehensive fuel point parameter and the comprehensive isopower curve group; controlling the engine operation according to the comprehensive engine working curve. In the technical solution of the present invention, by determining the comprehensive engine working curve, fuel consumption is reduced, battery utilization is increased, and the cruising range of the hybrid vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid electric vehicles, and in particular to a hybrid electric vehicle engine control method, a vehicle and a readable storage medium. Background Art

[0002] Traditional hybrid vehicles, in the series-parallel mode, mostly let the engine work on the optimal curve alone. At this time, the optimal working curve of the engine and the optimal working curve of the single engine do not overlap, the fuel consumption is high, and the overall efficiency of the engine and generator is not optimal. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] In view of this, a first aspect of an embodiment of the present invention provides a hybrid vehicle engine control method.

[0005] A second aspect of an embodiment of the present invention provides a vehicle.

[0006] A third aspect of an embodiment of the present invention provides a readable storage medium.

[0007] In order to achieve the above-mentioned purpose, an embodiment of the first aspect of the present invention provides a hybrid vehicle engine control method for driving a vehicle, including an engine and a generator, the engine and the generator are transmission-connected, and the engine drives the generator to generate electricity; the hybrid vehicle engine control method includes: obtaining the engine rotation parameters of the engine and the generator rotation parameters of the generator; determining the transmission ratio according to the generator rotation parameters and the engine rotation parameters; determining the first efficiency parameter according to the generator efficiency parameters, the generator rotation parameters and the transmission ratio of the generator; obtaining the fuel point parameters of the engine; determining the comprehensive fuel point parameters according to the first efficiency parameters and the fuel point parameters; determining the comprehensive isopower curve group according to the engine rotation parameters; determining the comprehensive engine working curve according to the comprehensive fuel point parameters and the comprehensive isopower curve group; controlling the engine operation according to the comprehensive engine working curve.

[0008] According to an embodiment of the first aspect of the present invention, a hybrid vehicle engine control method is provided, wherein the hybrid vehicle includes an engine and a generator, the engine and the generator are connected in a transmission manner, and drive the generator to generate electricity. The engine rotation parameter is a parameter related to the engine rotation, usually including the engine speed, the engine torque, etc., and the generator rotation parameter is a parameter related to the generator rotation, usually including the generator speed, the generator torque, etc. Since the engine drives the generator to rotate, it can be understood that there must be a corresponding relationship between the relevant parameters of the engine and the generator, that is, when the linkage structure of the engine and the generator is determined, there is a fixed transmission ratio between the engine rotation parameter and the generator rotation parameter. The generator efficiency parameter is the conversion efficiency of the generator in converting rotational kinetic energy into electrical energy. Obviously, the generator efficiency parameter is directly related to the generator rotation parameter, and the generator efficiency parameter may be different for different generator rotation parameters. Further, since the generator rotation parameter has a corresponding relationship with the engine rotation parameter, it can be understood that it may also have a corresponding relationship with the engine rotation parameter, wherein the first efficiency parameter is the generator efficiency parameter corresponding to the generator efficiency parameter generator rotation parameter. Obviously, different engine rotation parameters may correspond to different first efficiency parameters.

[0009] Further, the fuel point parameter of the engine is a fuel consumption value of the engine corresponding to different engine speeds and engine torques, and therefore, the fuel point parameter is directly related to the engine rotation parameter.

[0010] Since the engine and the generator are connected through a transmission and jointly convert fuel consumption into electrical energy, the engine and the generator can be regarded as a comprehensive engine. It can be understood that the amount of fuel consumed by the comprehensive engine for power generation is related to the first efficiency parameter in addition to the fuel point parameter. Among them, the comprehensive fuel parameter is a comprehensive fuel point parameter determined according to the fuel point parameter and the first efficiency parameter.

[0011] Furthermore, the comprehensive isopower curve group is a plurality of engine isopower curves determined according to the engine rotation parameters. It should be noted here that the engine powers corresponding to different engine speeds and engine torques may be the same or different. Connecting points with the same engine power into a curve is the engine isopower curve. Different engine isopower curves can be determined for different engine powers. The comprehensive isopower curve group is a combination of multiple engine isopower curves.

[0012] Furthermore, since the corresponding comprehensive fuel point parameter can be determined according to the engine speed and the engine torque, the minimum value of the comprehensive fuel point parameter on an engine equal power curve can be found. At the position of this minimum value, the fuel consumption corresponding to the engine power is the minimum.

[0013] The comprehensive engine operating curve is obtained by connecting the minimum comprehensive fuel point positions in multiple engine equal power curves in the comprehensive engine operating curve into one curve.

[0014] It can be understood that in a hybrid vehicle, the engine and the generator are regarded as a whole. According to the corresponding relationship between the transmission parameters of the generator and the engine, the generator efficiency parameter is associated with the engine speed and the engine torque, and the fuel point parameters corresponding to the same engine speed and engine torque are adjusted to determine the comprehensive fuel point parameters. The comprehensive isopower curve group and the comprehensive engine operating curve are further determined. According to the comprehensive engine operating curve, the engine of the hybrid vehicle can be controlled to always be on the comprehensive engine operating curve, thereby reducing fuel consumption, increasing the utilization rate of the battery, and improving the cruising range of the hybrid vehicle.

[0015] In addition, the hybrid vehicle engine control method in the above solution provided by the present invention may also have the following additional technical features:

[0016] In the above technical solution, the engine rotation parameters include engine speed and engine torque; the generator rotation parameters include generator speed and generator torque; the ratio of engine speed to generator speed is the transmission ratio; the ratio of generator torque to engine torque is the transmission ratio.

[0017] In this technical solution, the engine rotation parameters include engine speed and engine torque, and the generator rotation parameters include generator speed and generator torque. Since the engine and the generator are connected by transmission, there must be a fixed corresponding relationship between the transmission parameters of the engine and the generator, that is, the transmission ratio. The ratio of the engine speed to the generator speed is the transmission ratio; the ratio of the generator torque to the engine torque is the transmission ratio.

[0018] It should be noted that if the transmission structure between the engine and the generator does not change, the transmission ratio is a fixed value. If the transmission structure is different, the transmission ratio is also different.

[0019] In the above technical solution, the comprehensive fuel point parameter is determined according to the first efficiency parameter and the fuel point parameter, specifically including: determining the corresponding first efficiency parameter according to the engine rotation parameter corresponding to the fuel point parameter; determining the comprehensive fuel point parameter according to the first efficiency parameter and the fuel point parameter.

[0020] In this technical solution, the engine rotation parameters include the engine speed and the engine torque, and the motor rotation parameters include the motor speed and the motor torque. A generator coordinate system can be established with the generator speed and the generator torque. It can be understood that different points on the generator coordinate system can correspond to a specific generator efficiency parameter.

[0021] Furthermore, an engine coordinate system can be established with engine speed and engine torque. Since the engine speed and generator speed, and the engine torque and generator torque can be mutually converted through the transmission ratio, the points on the generator coordinate system can be mapped to the engine coordinate system. Among them, the first efficiency parameter is the generator efficiency parameter obtained by converting from the generator coordinate system to the engine coordinate system through coordinate mapping.

[0022] Furthermore, since the first efficiency parameter and the fuel point parameter are both in the engine coordinate system, for an engine rotation parameter, that is, a specific engine speed and torque, the corresponding fuel point parameter and the first efficiency parameter can be determined.

[0023] Further, according to a rotation parameter on the engine coordinate system, the corresponding first efficiency parameter and fuel point parameter can be obtained, and the fuel point parameter can be divided by the first efficiency parameter to obtain a comprehensive fuel point parameter. It can be understood that the comprehensive fuel point parameter can indicate the fuel consumption required for different generator powers.

[0024] In the above technical scheme, before determining the comprehensive equal power curve group according to the engine rotation parameters, it also includes: obtaining the generator peak torque of the generator; determining the equivalent generator peak torque according to the generator peak torque and the transmission ratio; obtaining the generator minimum torque of the generator; determining the equivalent generator minimum torque according to the generator minimum torque and the transmission ratio; obtaining the engine peak torque and the engine minimum torque of the engine; determining the comprehensive torque upper limit according to the equivalent generator peak torque and the engine peak torque; determining the comprehensive torque lower limit according to the equivalent generator minimum torque and the engine minimum torque.

[0025] In this technical solution, the equivalent generator peak torque is the corresponding value of the generator peak torque corresponding to the engine rotation parameter, and the equivalent generator minimum torque is the corresponding value of the generator minimum torque corresponding to the engine rotation parameter. Since the generator and the engine are connected by transmission, the torque of the engine will be constrained by the peak and minimum values ​​of the generator torque.

[0026] At the same time, the engine itself also has peak torque and minimum torque, so the engine should determine the peak torque and minimum torque based on the generator and the engine and the peak torque and minimum torque.

[0027] It can be understood that between the equivalent generator peak torque and the engine peak torque, the smaller value is taken, and between the equivalent generator minimum torque and the engine minimum torque, the maximum value is taken.

[0028] In the above technical scheme, before determining the comprehensive equal power curve group according to the engine rotation parameters, it also includes: obtaining the generator peak speed of the generator; determining the equivalent generator peak speed according to the generator peak speed and the transmission ratio; obtaining the generator minimum speed of the generator; determining the equivalent generator minimum speed according to the generator minimum speed and the transmission ratio; obtaining the engine peak speed and the engine minimum speed of the engine; determining the comprehensive speed upper limit according to the equivalent generator peak speed and the engine peak speed; determining the comprehensive speed lower limit according to the equivalent generator minimum speed and the engine minimum speed.

[0029] In this technical solution, the equivalent generator peak speed is the corresponding value of the generator peak speed corresponding to the engine rotation parameter, and the equivalent generator minimum speed is the corresponding value of the generator minimum speed corresponding to the engine rotation parameter. Since the generator and the engine are connected by transmission, the engine speed will be constrained by the peak and minimum values ​​of the generator speed.

[0030] At the same time, the engine itself also has a peak speed and a minimum speed, so the engine should determine the peak speed and the minimum speed based on the peak speed and the minimum speed of the generator and the engine.

[0031] It can be understood that between the equivalent generator peak speed and the engine peak speed, the smaller value is taken, and between the equivalent generator minimum speed and the engine minimum speed, the maximum value is taken.

[0032] In the above technical solution, obtaining the fuel point parameters of the engine also includes: obtaining the external characteristic curve of the engine and the universal characteristic curve of the engine; and determining the fuel point parameters according to the external characteristic curve and the universal characteristic curve.

[0033] In this technical solution, the external characteristic curve of the engine is the relationship curve between the engine speed and the engine torque at the maximum power of the engine. The universal characteristic curve is the equal fuel point curve corresponding to the engine speed and the engine torque. Since the external characteristic curve is the engine speed and the engine torque corresponding to the maximum power of the engine, it can be understood that the external characteristic curve will limit the coordinate range of the fuel point parameter.

[0034] In the above technical solution, determining the comprehensive isopower curve group according to the engine rotation parameters specifically includes: determining the engine power parameters according to the engine rotation parameters; setting the minimum engine power and the maximum engine power; setting the power interval value; determining at least one engine isopower curve according to the engine power parameters, the minimum engine power, the maximum engine power and the power interval value; determining the comprehensive isopower curve group according to at least one engine isopower curve.

[0035] In this technical solution, the engine rotation parameters include engine torque and engine speed, and the engine power is proportional to the product of the engine speed and the engine torque. Therefore, the corresponding engine power can be determined for each pair of engine speed and engine torque. The engine power parameter is all the engine powers corresponding to all engine speeds and all engine torques within the limit range. It can be understood that for different engine speeds and engine torques, the corresponding engine powers may be the same or different. Points with the same engine power can be connected into a curve, which is the engine equal power curve.

[0036] The maximum engine power and the minimum engine power are the upper and lower limits of the power for normal operation of the engine, which can be set manually according to the situation. It can be understood that there can be countless engine equal power curves between the maximum engine power and the minimum engine power. By setting the power interval value, the engine equal power curves can be screened, and finally a comprehensive equal power curve group with a certain interval can be obtained.

[0037] In the above technical solution, the comprehensive engine operating curve is determined based on the comprehensive fuel point parameters and the comprehensive isopower curve group, specifically including: determining all minimum comprehensive fuel point parameter coordinates based on all engine isopower curves and comprehensive fuel point parameters; determining the comprehensive engine operating curve based on all minimum comprehensive fuel point parameter coordinates.

[0038] In this technical solution, for the same engine speed and engine torque, the corresponding engine power and comprehensive fuel parameters can be determined. It can be understood that for the same engine isopower curve, the comprehensive fuel parameters at different positions on it may be different. Therefore, the engine rotation parameter at the position of the minimum value of the comprehensive fuel parameter on the engine isopower curve can be selected as a point of the comprehensive engine working curve. Obviously, at the point corresponding to the engine rotation parameter, the fuel consumption corresponding to the engine power is the smallest. Determine the engine rotation parameters of all the minimum comprehensive fuel points in the comprehensive isopower curve group, and connect these points into a curve to determine the comprehensive engine working curve.

[0039] The second aspect of the present invention provides a vehicle, comprising: a vehicle body; a generator for providing power to the vehicle body; an engine mechanically connected to the generator for driving the generator to generate electricity; a processor and a memory, wherein the memory stores a program or instruction, and the processor is used to implement the steps of the hybrid vehicle engine control method in any one of the first aspect embodiments when executing the program or instruction. Therefore, any beneficial effect in the first aspect embodiments is achieved, which will not be described in detail.

[0040] The third aspect of the present invention provides a readable storage medium on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of any hybrid vehicle engine control method in the first aspect of the present invention can be implemented. Therefore, any beneficial effect of the first aspect of the present invention is achieved, which will not be repeated here.

[0041] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic flow chart of a hybrid vehicle engine control method according to an embodiment of the present invention is shown;

[0043] Figure 2 A schematic flow chart of a hybrid vehicle engine control method according to an embodiment of the present invention is shown;

[0044] Figure 3 A schematic flow chart of a hybrid vehicle engine control method according to an embodiment of the present invention is shown;

[0045] Figure 4 A schematic flow chart of a hybrid vehicle engine control method according to an embodiment of the present invention is shown;

[0046] Figure 5 A schematic structural diagram of a vehicle according to an embodiment of the present invention is shown;

[0047] Figure 6 A schematic flow chart of a hybrid vehicle engine control method according to an embodiment of the present invention is shown;

[0048] Figure 7 A diagram showing a universal characteristic curve of an engine according to an embodiment of the present invention is shown;

[0049] Figure 8 An efficiency graph of a generator mapped to an engine according to an embodiment of the present invention is shown;

[0050] Fig. 9 Comprehensive engine optimal operating curve diagram.

[0051] in, Figure 5 The corresponding relationship between the reference numerals and the component names is as follows:

[0052] 600: vehicle; 602: vehicle body; 604: engine; 606: processor; 608: memory; 610: generator. DETAILED DESCRIPTION

[0053] In order to more clearly understand the above-mentioned purposes, features and advantages of the embodiments of the present invention, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0054] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the embodiments of the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0055] Refer to the following Figures 1 to 9 Some embodiments according to the invention are described.

[0056] Embodiment 1

[0057] like Figure 1 As shown, a hybrid vehicle engine control method proposed in this embodiment includes: step S102: obtaining the engine rotation parameters of the engine and the generator rotation parameters of the generator; step S104: determining the transmission ratio according to the generator rotation parameters and the engine rotation parameters; step S106: determining the first efficiency parameter according to the generator efficiency parameter, the generator rotation parameter and the transmission ratio of the generator; step S108: obtaining the fuel point parameter of the engine; step S110: determining the comprehensive fuel point parameter according to the first efficiency parameter and the fuel point parameter; step S112: determining the comprehensive isopower curve group according to the engine rotation parameters; step S114: determining the comprehensive engine operating curve according to the comprehensive fuel point parameter and the comprehensive isopower curve group; step S116: controlling the engine operation according to the comprehensive engine operating curve.

[0058] The hybrid vehicle of this embodiment includes an engine and a generator, which are connected in a transmission manner to drive the generator to generate electricity. Among them, the engine rotation parameter is a parameter related to the engine rotation, which usually includes the engine speed, the engine torque, etc., and the generator rotation parameter is a parameter related to the generator rotation, which usually includes the generator speed, the generator torque, etc. Since the engine drives the generator to rotate, it can be understood that there must be a corresponding relationship between the relevant parameters of the engine and the generator, that is, when the linkage structure of the engine and the generator is determined, there is a fixed transmission ratio between the engine rotation parameter and the generator rotation parameter. The generator efficiency parameter is the conversion efficiency of the generator to convert rotational kinetic energy into electrical energy. Obviously, the generator efficiency parameter is directly related to the generator rotation parameter, and the generator efficiency parameter may be different for different generator rotation parameters. Further, since the generator rotation parameter has a corresponding relationship with the engine rotation parameter, it can be understood that the generator efficiency parameter may also have a corresponding relationship with the engine rotation parameter, wherein the first efficiency parameter is the generator efficiency parameter corresponding to the engine rotation parameter. Obviously, different engine rotation parameters may correspond to different first efficiency parameters.

[0059] Further, the fuel point parameter of the engine is a fuel consumption value of the engine corresponding to different engine speeds and engine torques, and therefore, the fuel point parameter is directly related to the engine rotation parameter.

[0060] Since the engine and the generator are connected through a transmission and jointly convert fuel consumption into electrical energy, the engine and the generator can be regarded as a comprehensive engine. It can be understood that the amount of fuel consumed by the comprehensive engine for power generation is related to the first efficiency parameter in addition to the fuel point parameter. Among them, the comprehensive fuel parameter is a comprehensive fuel point parameter determined according to the fuel point parameter and the first efficiency parameter.

[0061] Furthermore, the comprehensive isopower curve group is a plurality of engine isopower curves determined according to the engine rotation parameters. It should be noted here that the engine powers corresponding to different engine speeds and engine torques may be the same or different. Connecting points with the same engine power into a curve is the engine isopower curve. Different engine isopower curves can be determined for different engine powers. The comprehensive isopower curve group is a combination of multiple engine isopower curves.

[0062] Furthermore, since the corresponding comprehensive fuel point parameter can be determined according to the engine speed and the engine torque, the minimum value of the comprehensive fuel point parameter on an engine equal power curve can be found. At the position of this minimum value, the fuel consumption corresponding to the engine power is the minimum.

[0063] The comprehensive engine operating curve is obtained by connecting the minimum comprehensive fuel point positions in multiple engine equal power curves in the comprehensive engine operating curve into one curve.

[0064] It can be understood that in a hybrid vehicle, the engine and the generator are regarded as a whole. According to the corresponding relationship between the transmission parameters of the generator and the engine, the generator efficiency parameter is associated with the engine speed and the engine torque, and the fuel point parameters corresponding to the same engine speed and engine torque are adjusted to determine the comprehensive fuel point parameters. The comprehensive isopower curve group and the comprehensive engine operating curve are further determined. According to the comprehensive engine operating curve, the engine of the hybrid vehicle can be controlled to always be on the comprehensive engine operating curve, thereby reducing fuel consumption, increasing the utilization rate of the battery, and improving the cruising range of the hybrid vehicle.

[0065] Embodiment 2

[0066] like Figure 2 As shown, a hybrid vehicle engine control method proposed in this embodiment includes: step S202: obtaining the engine rotation parameters of the engine and the generator rotation parameters of the generator; step S204: determining the transmission ratio according to the generator rotation parameters and the engine rotation parameters; step S206: determining the first efficiency parameter according to the generator efficiency parameter, the generator rotation parameter and the transmission ratio of the generator; step S208: obtaining the fuel point parameter of the engine; step S210: determining the corresponding first efficiency parameter according to the engine rotation parameter corresponding to the fuel point parameter; step S212: determining the comprehensive fuel point parameter according to the first efficiency parameter and the fuel point parameter; step S214: determining the comprehensive isopower curve group according to the engine rotation parameters; step S216: determining the comprehensive engine working curve according to the comprehensive fuel point parameter and the comprehensive isopower curve group; step S218: controlling the engine operation according to the comprehensive engine working curve.

[0067] The hybrid vehicle of this embodiment includes an engine and a generator, which are connected in a transmission manner to drive the generator to generate electricity. Among them, the engine rotation parameter is a parameter related to the engine rotation, which usually includes the engine speed, the engine torque, etc., and the generator rotation parameter is a parameter related to the generator rotation, which usually includes the generator speed, the generator torque, etc. Since the engine drives the generator to rotate, it can be understood that there must be a corresponding relationship between the relevant parameters of the engine and the generator, that is, when the linkage structure of the engine and the generator is determined, there is a fixed transmission ratio between the engine rotation parameter and the generator rotation parameter. The generator efficiency parameter is the conversion efficiency of the generator to convert rotational kinetic energy into electrical energy. Obviously, the generator efficiency parameter is directly related to the generator rotation parameter, and the generator efficiency parameter may be different for different generator rotation parameters. Further, since the generator rotation parameter has a corresponding relationship with the engine rotation parameter, it can be understood that the generator efficiency parameter may also have a corresponding relationship with the engine rotation parameter, wherein the first efficiency parameter is the generator efficiency parameter corresponding to the engine rotation parameter. Obviously, different engine rotation parameters may correspond to different first efficiency parameters.

[0068] Among them, the engine rotation parameters include engine speed and engine torque, and the generator rotation parameters include generator speed and generator torque. Since the engine and the generator are connected by transmission, there must be a fixed corresponding relationship between the transmission parameters of the engine and the generator, that is, the transmission ratio. The ratio of the engine speed to the generator speed is the transmission ratio; the ratio of the generator torque to the engine torque is the transmission ratio.

[0069] It should be noted that if the transmission structure between the engine and the generator does not change, the transmission ratio is a fixed value. If the transmission structure is different, the transmission ratio is also different.

[0070] The engine rotation parameters include engine speed and engine torque, and the motor rotation parameters include motor speed and motor torque. A generator coordinate system can be established with generator speed and generator torque. It can be understood that different points on the generator coordinate system can correspond to a specific generator efficiency parameter.

[0071] Furthermore, an engine coordinate system can be established with engine speed and engine torque. Since the engine speed and generator speed, and the engine torque and generator torque can be mutually converted through the transmission ratio, the points on the generator coordinate system can be mapped to the engine coordinate system. Among them, the first efficiency parameter is the generator efficiency parameter obtained by converting from the generator coordinate system to the engine coordinate system through coordinate mapping.

[0072] Furthermore, since the first efficiency parameter and the fuel point parameter are both in the engine coordinate system, for an engine rotation parameter, that is, a specific engine speed and torque, the corresponding fuel point parameter and the first efficiency parameter can be determined.

[0073] Further, according to a rotation parameter on the motor coordinate system, the corresponding first efficiency parameter and fuel point parameter can be obtained, and the fuel point parameter can be divided by the first efficiency parameter to obtain a comprehensive fuel point parameter. It can be understood that the comprehensive fuel point parameter can indicate the fuel consumption required for different generator powers.

[0074] Furthermore, the comprehensive isopower curve group is a plurality of engine isopower curves determined according to the engine rotation parameters. It should be noted here that the engine powers corresponding to different engine speeds and engine torques may be the same or different. Connecting points with the same engine power into a curve is the engine isopower curve. Different engine isopower curves can be determined for different engine powers. The comprehensive isopower curve group is a combination of multiple engine isopower curves.

[0075] It can be understood that in a hybrid vehicle, the engine and the generator are regarded as a whole. According to the corresponding relationship between the transmission parameters of the generator and the engine, the generator efficiency parameter is associated with the engine speed and the engine torque, and the fuel point parameters corresponding to the same engine speed and engine torque are adjusted to determine the comprehensive fuel point parameters. The comprehensive isopower curve group and the comprehensive engine operating curve are further determined. According to the comprehensive engine operating curve, the engine of the hybrid vehicle can be controlled to always be on the comprehensive engine operating curve, thereby reducing fuel consumption, increasing the utilization rate of the battery, and improving the cruising range of the hybrid vehicle.

[0076] Embodiment 3

[0077] like Figure 3As shown, a hybrid vehicle engine control method proposed in this embodiment includes: step S302: obtaining an engine rotation parameter of the engine and a generator rotation parameter of the generator; step S304: determining a transmission ratio according to the generator rotation parameter and the engine rotation parameter; step S306: determining a first efficiency parameter according to the generator efficiency parameter, the generator rotation parameter and the transmission ratio of the generator; step S308: obtaining a fuel point parameter of the engine; step S310: determining a corresponding first efficiency parameter according to the engine rotation parameter corresponding to the fuel point parameter; step S312: determining a comprehensive fuel point parameter according to the first efficiency parameter and the fuel point parameter; step S314: Determine the upper limit of the comprehensive torque according to the equivalent generator peak torque and the engine peak torque; Step S316: Determine the lower limit of the comprehensive torque according to the equivalent generator minimum torque and the engine minimum torque; Step S318: Determine the upper limit of the comprehensive speed according to the equivalent generator peak speed and the engine peak speed; Step S320: Determine the lower limit of the comprehensive speed according to the equivalent generator minimum speed and the engine minimum speed; Step S322: Determine the comprehensive equal power curve group according to the engine rotation parameters; Step S324: Determine the comprehensive engine operating curve according to the comprehensive fuel point parameters and the comprehensive equal power curve group; Step S326: Control the engine operation according to the comprehensive engine operating curve.

[0078] The hybrid vehicle of this embodiment includes an engine and a generator, which are connected in a transmission manner to drive the generator to generate electricity. Among them, the engine rotation parameter is a parameter related to the engine rotation, which usually includes the engine speed, the engine torque, etc., and the generator rotation parameter is a parameter related to the generator rotation, which usually includes the generator speed, the generator torque, etc. Since the engine drives the generator to rotate, it can be understood that there must be a corresponding relationship between the relevant parameters of the engine and the generator, that is, when the linkage structure of the engine and the generator is determined, there is a fixed transmission ratio between the engine rotation parameter and the generator rotation parameter. The generator efficiency parameter is the conversion efficiency of the generator to convert rotational kinetic energy into electrical energy. Obviously, the generator efficiency parameter is directly related to the generator rotation parameter, and the generator efficiency parameter may be different for different generator rotation parameters. Further, since the generator rotation parameter has a corresponding relationship with the engine rotation parameter, it can be understood that the generator efficiency parameter may also have a corresponding relationship with the engine rotation parameter, wherein the first efficiency parameter is the generator efficiency parameter corresponding to the generator rotation parameter. Obviously, different engine rotation parameters may correspond to different first efficiency parameters.

[0079] Among them, the engine rotation parameters include engine speed and engine torque, and the generator rotation parameters include generator speed and generator torque. Since the engine and the generator are connected by transmission, there must be a fixed corresponding relationship between the transmission parameters of the engine and the generator, that is, the transmission ratio. The ratio of the engine speed to the generator speed is the transmission ratio; the ratio of the generator torque to the engine torque is the transmission ratio.

[0080] It should be noted that if the transmission structure between the engine and the generator does not change, the transmission ratio is a fixed value. If the transmission structure is different, the transmission ratio is also different.

[0081] The engine rotation parameters include engine speed and engine torque, and the motor rotation parameters include motor speed and motor torque. A generator coordinate system can be established with generator speed and generator torque. It can be understood that different points on the generator coordinate system can correspond to a specific generator efficiency parameter.

[0082] Furthermore, an engine coordinate system can be established with engine speed and engine torque. Since the engine speed and generator speed, and the engine torque and generator torque can be mutually converted through the transmission ratio, the points on the generator coordinate system can be mapped to the engine coordinate system. Among them, the first efficiency parameter is the generator efficiency parameter obtained by converting from the generator coordinate system to the engine coordinate system through coordinate mapping.

[0083] Furthermore, since the first efficiency parameter and the fuel point parameter are both in the engine coordinate system, for an engine rotation parameter, that is, a specific engine speed and torque, the corresponding fuel point parameter and the first efficiency parameter can be determined.

[0084] Furthermore, the equivalent generator peak torque is the value of the generator peak torque corresponding to the engine rotation parameter, and the equivalent generator minimum torque is the value of the generator minimum torque corresponding to the engine rotation parameter. Since the generator and the engine are connected by transmission, the torque of the engine will be constrained by the peak and minimum values ​​of the generator torque.

[0085] At the same time, the engine itself also has peak torque and minimum torque, so the engine should determine the peak torque and minimum torque based on the generator and the engine and the peak torque and minimum torque.

[0086] It can be understood that between the equivalent generator peak torque and the engine peak torque, the smaller value is taken, and between the equivalent generator minimum torque and the engine minimum torque, the maximum value is taken.

[0087] Similarly, the equivalent generator peak speed is the value of the generator peak speed corresponding to the engine rotation parameter, and the equivalent generator minimum speed is the value of the generator minimum speed corresponding to the engine rotation parameter. Since the generator and the engine are connected by transmission, the engine speed will be constrained by the peak and minimum values ​​of the generator speed.

[0088] At the same time, the engine itself also has a peak speed and a minimum speed, so the engine should determine the peak speed and the minimum speed based on the peak speed and the minimum speed of the generator and the engine.

[0089] It can be understood that between the equivalent generator peak speed and the engine peak speed, the smaller value is taken, and between the equivalent generator minimum speed and the engine minimum speed, the maximum value is taken.

[0090] Furthermore, the external characteristic curve of the engine is the relationship curve between the engine speed and the engine torque at the maximum power of the engine. The universal characteristic curve is the equal fuel point curve corresponding to the engine speed and the engine torque. Since the external characteristic curve is the engine speed and the engine torque corresponding to the maximum power of the engine, it can be understood that the external characteristic curve will limit the coordinate range of the fuel point parameter.

[0091] Further, according to a rotation parameter on the motor coordinate system, the corresponding first efficiency parameter and fuel point parameter can be obtained, and the fuel point parameter can be divided by the first efficiency parameter to obtain a comprehensive fuel point parameter. It can be understood that the comprehensive fuel point parameter can indicate the fuel consumption required for different generator powers.

[0092] Furthermore, the comprehensive isopower curve group is a plurality of engine isopower curves determined according to the engine rotation parameters. It should be noted here that the engine powers corresponding to different engine speeds and engine torques may be the same or different. Connecting points with the same engine power into a curve is the engine isopower curve. Different engine isopower curves can be determined for different engine powers. The comprehensive isopower curve group is a combination of multiple engine isopower curves.

[0093] It can be understood that in a hybrid vehicle, the engine and the generator are regarded as a whole. According to the corresponding relationship between the transmission parameters of the generator and the engine, the generator efficiency parameter is associated with the engine speed and the engine torque, and the fuel point parameters corresponding to the same engine speed and engine torque are adjusted to determine the comprehensive fuel point parameters. The comprehensive isopower curve group and the comprehensive engine operating curve are further determined. According to the comprehensive engine operating curve, the engine of the hybrid vehicle can be controlled to always be on the comprehensive engine operating curve, thereby reducing fuel consumption, increasing the utilization rate of the battery, and improving the cruising range of the hybrid vehicle.

[0094] Embodiment 4

[0095] like Figure 4 As shown, a hybrid vehicle engine control method proposed in this embodiment includes: step S402: obtaining an engine rotation parameter of the engine and a generator rotation parameter of the generator; step S404: determining a transmission ratio according to the generator rotation parameter and the engine rotation parameter; step S406: determining a first efficiency parameter according to the generator efficiency parameter, the generator rotation parameter and the transmission ratio of the generator; step S408: obtaining a fuel point parameter of the engine; step S410: determining a corresponding first efficiency parameter according to the engine rotation parameter corresponding to the fuel point parameter; step S412: determining a comprehensive fuel point parameter according to the first efficiency parameter and the fuel point parameter; step S414: determining upper and lower limits of the comprehensive speed and torque; step S416: determining the upper and lower limits of the comprehensive speed and torque according to the fuel point parameter; step S417: determining the upper and lower limits of the comprehensive speed and torque according to the fuel point parameter; step S418: determining the upper and lower limits of the comprehensive speed and torque according to the fuel point parameter; step S420: determining the upper and lower limits of the comprehensive speed and torque according to the fuel point parameter; step S421: determining the upper and lower limits of the comprehensive speed and torque according to the fuel point parameter; step S422: determining the upper and lower limits of the comprehensive speed and torque according to the fuel point parameter; step S423: determining the upper and lower limits of the comprehensive speed and torque according to the fuel point parameter; step S424: determining the upper and lower limits of the comprehensive speed and torque according to the fuel point parameter; step S425: determining the upper and lower limits of the comprehensive speed and torque according to the fuel point parameter; step S426: determining the upper and lower limits of the comprehensive speed and torque according to the fuel point parameter; step S427: determining the upper and lower limits of the comprehensive speed and torque according to the fuel point parameter; step S428: determining the upper and lower limits of the comprehensive speed and torque according to the fuel point parameter; step S429: determining the upper and lower limits of the comprehensive speed and torque according to the fuel point parameter; step S430: determining the upper and lower limits of the According to the engine rotation parameters, determine the engine power parameters; step S418: set the minimum engine power and the maximum engine power; step S420: set the power interval value; step S422: determine at least one engine isopower curve according to the engine power parameters, the minimum engine power, the maximum engine power and the power interval value; step S424: determine a comprehensive isopower curve group according to at least one engine isopower curve; step S426: determine all minimum comprehensive fuel point parameter coordinates according to all engine isopower curves and comprehensive fuel point parameters; step S428: determine a comprehensive engine operating curve according to all minimum comprehensive fuel point parameter coordinates; step S430: control the engine operation according to the comprehensive engine operating curve.

[0096] The hybrid vehicle of this embodiment includes an engine and a generator, which are connected in a transmission manner to drive the generator to generate electricity. Among them, the engine rotation parameter is a parameter related to the engine rotation, which usually includes the engine speed, the engine torque, etc., and the generator rotation parameter is a parameter related to the generator rotation, which usually includes the generator speed, the generator torque, etc. Since the engine drives the generator to rotate, it can be understood that there must be a corresponding relationship between the relevant parameters of the engine and the generator, that is, when the linkage structure of the engine and the generator is determined, there is a fixed transmission ratio between the engine rotation parameter and the generator rotation parameter. The generator efficiency parameter is the conversion efficiency of the generator to convert rotational kinetic energy into electrical energy. Obviously, the generator efficiency parameter is directly related to the generator rotation parameter, and the generator efficiency parameter may be different for different generator rotation parameters. Further, since the generator rotation parameter has a corresponding relationship with the engine rotation parameter, it can be understood that the generator efficiency parameter may also have a corresponding relationship with the engine rotation parameter, wherein the first efficiency parameter is the generator efficiency parameter corresponding to the generator rotation parameter. Obviously, different engine rotation parameters may correspond to different first efficiency parameters.

[0097] Among them, the engine rotation parameters include engine speed and engine torque, and the generator rotation parameters include generator speed and generator torque. Since the engine and the generator are connected by transmission, there must be a fixed corresponding relationship between the transmission parameters of the engine and the generator, that is, the transmission ratio. The ratio of the engine speed to the generator speed is the transmission ratio; the ratio of the generator torque to the engine torque is the transmission ratio.

[0098] It should be noted that if the transmission structure between the engine and the generator does not change, the transmission ratio is a fixed value. If the transmission structure is different, the transmission ratio is also different.

[0099] The engine rotation parameters include engine speed and engine torque, and the motor rotation parameters include motor speed and motor torque. A generator coordinate system can be established with generator speed and generator torque. It can be understood that different points on the generator coordinate system can correspond to a specific generator efficiency parameter.

[0100] Furthermore, an engine coordinate system can be established with engine speed and engine torque. Since the engine speed and generator speed, and the engine torque and generator torque can be mutually converted through the transmission ratio, the points on the generator coordinate system can be mapped to the engine coordinate system. Among them, the first efficiency parameter is the generator efficiency parameter obtained by converting from the generator coordinate system to the engine coordinate system through coordinate mapping.

[0101] Furthermore, since the first efficiency parameter and the fuel point parameter are both in the engine coordinate system, for an engine rotation parameter, that is, a specific engine speed and torque, the corresponding fuel point parameter and the first efficiency parameter can be determined.

[0102] Further, according to a rotation parameter on the motor coordinate system, the corresponding first efficiency parameter and fuel point parameter can be obtained, and the fuel point parameter can be divided by the first efficiency parameter to obtain a comprehensive fuel point parameter. It can be understood that the comprehensive fuel point parameter can indicate the fuel consumption required for different generator powers.

[0103] Furthermore, the engine rotation parameters include engine torque and engine speed, and the engine power is proportional to the product of the engine speed and the engine torque. Therefore, the corresponding engine power can be determined for each pair of engine speed and engine torque. The engine power parameter is all the engine powers corresponding to all engine speeds and all engine torques within the limit range. It can be understood that for different engine speeds and engine torques, the corresponding engine powers may be the same or different. Points with the same engine power can be connected into a curve, which is the engine equal power curve.

[0104] The maximum engine power and the minimum engine power are the upper and lower limits of the power for normal operation of the engine, which can be set manually according to the situation. It can be understood that there can be countless engine equal power curves between the maximum engine power and the minimum engine power. By setting the power interval value, the engine equal power curves can be screened, and finally a comprehensive equal power curve group with a certain interval can be obtained.

[0105] Furthermore, for the same engine speed and engine torque, the corresponding engine power and comprehensive fuel parameters can be determined. It can be understood that for the same engine isopower curve, the comprehensive fuel parameters at different positions on it may be different. Therefore, the engine rotation parameter at the position of the minimum value of the comprehensive fuel parameter on the engine isopower curve can be selected as a point of the comprehensive engine working curve. Obviously, at the point corresponding to the engine rotation parameter, the fuel consumption corresponding to the engine power is the smallest. The comprehensive engine working curve can be determined by determining the engine rotation parameters of all the minimum comprehensive fuel points in the comprehensive isopower curve group and connecting these points into a curve. According to the comprehensive engine working curve, the engine of the hybrid vehicle can be controlled to always be on the comprehensive engine working curve, thereby reducing fuel consumption, increasing battery utilization, and improving the cruising range of the hybrid vehicle.

[0106] Embodiment 5

[0107] like Figure 5 As shown, this embodiment proposes a vehicle 600, including: a vehicle body 602; a generator 610, used to provide power to the vehicle body 602; an engine 604, mechanically connected to the generator 610, used to drive the generator 610 to generate electricity; a processor 606 and a memory 608, wherein the memory 608 stores a program or instruction, and the processor 606 is used to implement the steps of the hybrid vehicle engine control method of any one of the above-mentioned first aspect embodiments when executing the program or instruction. Therefore, any beneficial effect of the above-mentioned first aspect embodiments is achieved, which will not be repeated here.

[0108] Embodiment 6

[0109] This embodiment provides a readable storage medium on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of any hybrid vehicle engine control method in the first embodiment can be implemented. Therefore, any beneficial effect of the first embodiment is achieved, which will not be repeated here.

[0110] Embodiment 7

[0111] like Figure 6As shown, this embodiment proposes a hybrid vehicle engine control method, including: step S502: reading engine data, drawing the engine external characteristic curve and the universal characteristic curve; step S504: reading generator data; step S506: mapping the generator's isoefficiency curve to the engine end; step S508: calculating the torque limit and speed limit of the combined power generation of the generator and the engine; step S510: drawing a comprehensive engine isofuel point curve diagram, a comprehensive external characteristic curve diagram and an isopower curve; step S512: calculating a comprehensive engine optimal working curve.

[0112] In this embodiment Figure 6 All the steps in the above are completed in Matlab environment. The first step is to read the engine data and draw the engine external characteristic curve and universal characteristic curve. The graphs drawn are Figure 7 The curves indicated by numbers 1 and 2.

[0113] Figure 6 The efficiency value of the generator is mapped to the engine end. The specific implementation measures are as follows: the engine speed is the motor speed × 0.404 in the generator efficiency curve (i.e., the generator efficiency parameter), the engine torque is the torque / 0.404 in the generator equivalent curve, and the efficiency is the efficiency in the generator equivalent curve. 0.404 is the transmission ratio between the generator and the engine. According to this method, the mapping generator efficiency curve (i.e., the first efficiency parameter) and the peak external characteristic curve are drawn, and the graphs drawn are respectively Figure 8 The curves indicated by numbers 4 and 3.

[0114] Figure 6 The torque limit and speed limit of the combined power generation of the generator and the engine are calculated in , and the specific implementation method is: the limit torque is taken as the minimum of the peak torques mapped to the engine end by the engine and the generator, and the maximum of the minimum torques reflected to the engine end by the engine and the generator; the limit speed is taken as the minimum of the peak speeds reflected to the engine end by the engine and the generator, and the maximum of the minimum speeds reflected to the engine end by the engine and the generator.

[0115] Figure 6 The comprehensive fuel point data of the engine and generator are calculated in the specific implementation method: the efficiency value temp1 (i.e., the first efficiency parameter) mapped from the generator to the engine and the engine fuel value temp2 (i.e., the fuel point parameter) are calculated respectively. The comprehensive fuel point parameter of the generator and the engine is (temp2 / temp1)×100, where temp1 is a percentage and therefore needs to be multiplied by 100 during calculation.

[0116] Figure 6Draw a comprehensive engine equal fuel point curve, comprehensive external characteristic curve and equal power curve. Draw 20 equal fuel point curves according to the comprehensive fuel point data calculated in the previous step, define the upper and lower limits of the comprehensive engine power as 10KW and 80KW respectively, and draw the engine equal power curve every 10kW. The comprehensive external characteristic curve, 20 comprehensive engine equal fuel point curves and comprehensive engine equal power curves are drawn as follows: Fig. 9 The curves indicated by numbers 5, 6 and 7.

[0117] Figure 6 The optimal working curve of the engine is calculated in the following way: the specific method is to use a loop statement to find the engine speed and torque corresponding to the optimal fuel point under each power, and draw the optimal working curve, such as Fig. 9 The curve indicated by serial number 8. In the combined optimal working curve of the generator and the engine, the torque value is the minimum torque corresponding to the minimum fuel consumption point among multiple fuel point values, and the speed value is the speed calculated by dividing the power by the torque at the minimum torque point corresponding to the minimum fuel point.

[0118] The hybrid vehicle of the embodiment of the present invention is a control method for the optimal working curve of the engine in the series mode. The present invention integrates the generator efficiency curve and the universal characteristic curve of the engine, calculates the comprehensive optimal fuel curve through an effective control algorithm, and gives a reasonable limit range in combination with the characteristic parameters of the engine and the generator. The engine is always on the working curve of the optimal fuel point in the hybrid mode, saving electricity and improving fuel efficiency. The control method of the invention is used to simulate the economic power performance using Cruise software. Under the new European driving conditions, the comprehensive fuel consumption of the hybrid vehicle is reduced from 2.15L / 100KW to 2.04L / 100KW, and the fuel consumption is reduced by 5.12%; the comprehensive power consumption is reduced from 11.24kWh / 100kW to 10.67kWh / 100kW, and the energy consumption can be reduced by 5.07%, which increases the utilization rate of the battery and improves the driving range of the hybrid vehicle.

[0119] According to the hybrid vehicle engine control method and vehicle embodiments of the present invention, by determining the comprehensive engine operating curve, the engine of the hybrid vehicle can be controlled to always be on the comprehensive engine operating curve, thereby reducing fuel consumption, increasing battery utilization, and improving the cruising range of the hybrid vehicle.

[0120] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0121] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0122] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0123] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hybrid vehicle engine control method for driving a vehicle, It is characterized in that It includes an engine and a generator, the engine and the generator are connected in a transmission manner, and the engine drives the generator to generate electricity; The hybrid vehicle engine control method comprises: acquiring an engine rotation parameter of the engine and a generator rotation parameter of the generator; determining a transmission ratio according to the generator rotation parameter and the engine rotation parameter; determining a first efficiency parameter according to a generator efficiency parameter of the generator, the generator rotation parameter and the transmission ratio; Obtaining fuel point parameters of the engine; determining a comprehensive fuel point parameter according to the first efficiency parameter and the fuel point parameter; determining a comprehensive isopower curve group according to the engine rotation parameters; determining a comprehensive engine operating curve according to the comprehensive fuel point parameter and the comprehensive isopower curve group; Control engine operation according to the comprehensive engine operating curve.

2. The hybrid vehicle engine control method according to claim 1, It is characterized in that The engine rotation parameters include engine speed and engine torque; the generator rotation parameters include generator speed and generator torque; the ratio of the engine speed to the generator speed is the transmission ratio; the ratio of the generator torque to the engine torque is the transmission ratio.

3. The hybrid vehicle engine control method according to claim 1, It is characterized in that The determining of the comprehensive fuel point parameter according to the first efficiency parameter and the fuel point parameter specifically includes: determining the first efficiency parameter corresponding to the fuel point parameter according to the engine rotation parameter; The comprehensive fuel point parameter is determined according to the first efficiency parameter and the fuel point parameter.

4. The hybrid vehicle engine control method according to claim 2, It is characterized in that Before determining the comprehensive iso-power curve group according to the engine rotation parameter, the method further includes: Obtaining a generator peak torque of the generator; Determining an equivalent generator peak torque according to the generator peak torque and the transmission ratio; Obtaining a minimum generator torque of the generator; Determining an equivalent generator minimum torque according to the generator minimum torque and the transmission ratio; Obtaining an engine peak torque and an engine minimum torque of the engine; Determine the upper limit of the comprehensive torque according to the equivalent generator peak torque and the engine peak torque; The lower limit of the comprehensive torque is determined based on the equivalent generator minimum torque and the engine minimum torque.

5. The hybrid vehicle engine control method according to claim 4, It is characterized in that Before determining the comprehensive iso-power curve group according to the engine rotation parameter, the method further includes: Obtaining a peak generator speed of the generator; Determining an equivalent generator peak speed according to the generator peak speed and the transmission ratio; Obtaining a minimum generator speed of the generator; Determining an equivalent generator minimum speed according to the generator minimum speed and the transmission ratio; Obtaining an engine peak speed and an engine minimum speed of the engine; Determine the upper limit of the comprehensive speed based on the peak speed of the equivalent generator and the peak speed of the engine; Determine the lower limit of the comprehensive speed based on the minimum speed of the equivalent generator and the minimum speed of the engine.

6. The method for controlling an engine of a hybrid vehicle according to claim 5, characterized in that, the obtaining of the fuel point parameters of the engine further includes: obtaining the external characteristic curve of the engine and the universal characteristic curve of the engine; determining the fuel point parameters according to the external characteristic curve and the universal characteristic curve.

7. The method for controlling an engine of a hybrid vehicle according to claim 6, characterized in that, the determining of the comprehensive constant-power curve group according to the engine rotation parameters specifically includes: determining the engine power parameters according to the engine rotation parameters; setting the minimum engine power and the maximum engine power; setting the power interval value; determining at least one engine constant-power curve according to the engine power parameters, the minimum engine power, the maximum engine power and the power interval value; determining the comprehensive constant-power curve group according to at least one of the engine constant-power curves.

8. The method for controlling an engine of a hybrid vehicle according to claim 7, characterized in that, the determining of the comprehensive engine operating curve according to the comprehensive fuel point parameters and the comprehensive constant-power curve group specifically includes: determining all the minimum comprehensive fuel point parameter coordinates according to all the engine constant-power curves and the comprehensive fuel point parameters; determining the comprehensive engine operating curve according to all the minimum comprehensive fuel point parameter coordinates.

9. A vehicle (600), characterized in that, the vehicle (600) includes: a vehicle body (602); a generator (610) provided on the vehicle body (602) for supplying power to the vehicle body (602); an engine (604) provided on the vehicle body (602) and mechanically connected to the generator (610) for driving the generator (610) to generate electricity; a processor (606) and a memory (608), wherein a computer program is stored in the memory (608), and the processor (606) is configured to implement the steps of the method for controlling an engine of a hybrid vehicle according to any one of claims 1 to 8 when executing the computer program.

10. A readable storage medium having a computer program stored thereon, characterized in that, the computer program, when executed by a processor, is capable of implementing the steps of the method for controlling an engine of a hybrid vehicle according to any one of claims 1 to 8.

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