Engine control method, hybrid vehicle, and storage medium

Abstract

The application provides an engine control method, a hybrid vehicle and a storage medium. The method is applied to a hybrid vehicle, the hybrid vehicle comprising an engine and a power battery. The method comprises the following steps: obtaining a current temperature of the engine, a current operating parameter of the power battery and a battery parameter reference value; determining a battery parameter threshold of the power battery at the current temperature according to the current temperature and the battery parameter reference value; wherein the lower the current temperature is, the greater the corresponding battery parameter threshold is; judging whether the current operating parameter is less than or equal to the battery parameter threshold; and outputting a starting signal to start the engine if the current operating parameter is less than or equal to the battery parameter threshold. The engine control method provided by the application can start the engine when the driving capability of the power battery of the hybrid vehicle is high in a low-temperature environment, so that the engine can avoid outputting a large torque when starting, and thus the engine can be prevented from being damaged due to poor lubrication.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hybrid vehicles, in particular to an engine control method, a hybrid vehicle and a storage medium. BACKGROUND

[0002] The hybrid electric vehicle has a driving engine start-stop working condition, that is, when the engine output power is needed in the pure electric working condition, the engine is started to participate in driving. In a low temperature environment, when the SOC (State of Charge) of the power battery is low, the allowable discharge power is low, or the driving demand torque suddenly increases, the existing hybrid vehicle starts the engine and makes the engine output a relatively large torque. At this time, since the lubricating oil in the engine has poor flowability, the engine is easily damaged due to poor lubrication. SUMMARY

[0003] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides an engine control method, a hybrid vehicle and a storage medium.

[0004] To achieve the above purpose, the present application provides an engine control method, which is applied to a hybrid vehicle, the hybrid vehicle comprising an engine and a power battery, the engine control method comprising: acquiring a current temperature of the engine, a current operating parameter of the power battery and a battery parameter reference value; determining a battery parameter threshold value of the power battery at the current temperature according to the current temperature and the battery parameter reference value; wherein the lower the current temperature, the greater the corresponding battery parameter threshold value; judging whether the current operating parameter is less than or equal to the battery parameter threshold value; and if the current operating parameter is less than or equal to the battery parameter threshold value, outputting a start signal to start the engine.

[0005] The engine control method provided by the present application determines the battery parameter threshold value of the power battery at the current temperature according to the current temperature and the battery parameter reference value, sets a larger battery parameter threshold value at low temperature, and starts the engine when the current operating parameter of the power battery is less than or equal to the battery parameter threshold value at the current temperature. In this way, in a low temperature environment, the hybrid vehicle starts the engine when the driving capability of the power battery is high, which can avoid the engine outputting a large torque when starting, and provides sufficient warm-up time for the engine, thereby avoiding damage to the engine due to poor lubrication.

[0006] Optionally, the determining the battery parameter threshold value of the power battery at the current temperature according to the current temperature and the battery parameter reference value comprises: determining a temperature coefficient corresponding to the current temperature according to the current temperature; and multiplying the battery parameter reference value by the temperature coefficient to obtain the battery parameter threshold value.

[0007] Optionally, the determining the temperature coefficient corresponding to the current temperature according to the current temperature comprises: determining a torque limit value corresponding to the current temperature according to the current temperature; and determining the temperature coefficient corresponding to the torque limit value.

[0008] Optionally, the lower the current temperature, the smaller the torque limit value corresponding to the current temperature; and the smaller the torque limit value, the greater the temperature coefficient corresponding to the torque limit value.

[0009] Optionally, the determining the torque limit value corresponding to the current temperature according to the current temperature comprises: obtaining a preset torque limit value calibration table; wherein the preset torque limit value calibration table records a mapping relationship between a plurality of temperature data ranges and a plurality of torque limit values; and determining the torque limit value corresponding to the current temperature according to the preset torque limit value calibration table.

[0010] Optionally, the determining the temperature coefficient corresponding to the torque limit value according to the torque limit value comprises: obtaining a preset temperature coefficient calibration table; wherein the preset temperature coefficient calibration table records a mapping relationship between a plurality of torque limit data and a plurality of temperature coefficients; and determining the temperature coefficient corresponding to the torque limit value according to the preset temperature coefficient calibration table.

[0011] Optionally, the current operating parameter of the power battery comprises a current remaining power, the battery parameter reference value comprises a remaining power reference value, and the battery parameter threshold value comprises a remaining power threshold value.

[0012] Optionally, the current operating parameter of the power battery comprises a current allowable discharge power, the battery parameter reference value comprises an allowable discharge power reference value, and the battery parameter threshold value comprises an allowable discharge power threshold value.

[0013] The application further provides a hybrid vehicle, which comprises an engine, a power battery, a detection unit, a memory and a controller. The detection unit is electrically connected with the engine and the power battery respectively, and is configured to detect a current temperature of the engine and a current operating parameter of the power battery. The memory is configured to store executable instructions. The controller is electrically connected with the detection unit and the memory respectively, and is configured to acquire the current temperature of the engine and the current operating parameter of the power battery detected by the detection unit, and execute the executable instructions stored in the memory based on the current temperature and the current operating parameter, so as to realize the method described above.

[0014] The application further provides a computer readable storage medium, which stores executable instructions, and the executable instructions are executed by a processor to implement the method.

[0015] Additional aspects and advantages of the application will be made apparent by the following description. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic diagram of a hybrid vehicle provided by an embodiment of the application.

[0017] Figure 2 is Figure 1 is an energy transmission path diagram of the hybrid vehicle in the series working condition.

[0018] Figure 3 is Figure 1 is an energy transmission path diagram of the hybrid vehicle in the series working condition.

[0019] Figure 4 is Figure 1 is an energy transmission path diagram of the hybrid vehicle in the series working condition.

[0020] Figure 5 is Figure 1 is an energy transmission path diagram of the hybrid vehicle in the series working condition.

[0021] Figure 6 is a flowchart of an engine control method provided by an embodiment of the application.

[0022] Figure 7 is Figure 6 is a refinement flowchart of step 620 in the method.

[0023] Figure 8 is a flowchart of another engine control method provided by an embodiment of the application.

[0024] Figure 9 is a schematic diagram of a torque limiting value calibration table provided by an embodiment of the application.

[0025] Figure 10 is a schematic diagram of a temperature coefficient calibration table provided by an embodiment of the application.

[0026] Figure 11 is a structural schematic diagram of another hybrid vehicle provided by an embodiment of the application.

[0027] The reference signs are explained as follows:

[0028] Hybrid vehicle 10

[0029] Vehicle controller 100

[0030] Engine controller 200

[0031] Motor controller 300

[0032] Engine 210

[0033] First motor 310

[0034] Second motor 320

[0035] Power battery 400

[0036] Wheel 500

[0037] Detection unit 600

[0038] Memory 700

[0039] Controller 800

[0040] Steps 610-640, 621-622, 631-633, 6321-6326

[0041] The following detailed description will describe the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, 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 fall within the scope of protection of the present application.

[0043] In the description of the present application, it should be noted that the terms "first", "second", etc. are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0044] As Figure 1As shown, the hybrid vehicle 10 includes a vehicle controller 100, an engine controller 200, an engine 210, a motor controller 300, a first motor 310, a second motor 320, a power battery 400, and wheels 500. The engine 210 is connected to the wheels 500 via a first clutch (not shown), and the second motor 320 is connected to the wheels 500 via a second clutch (not shown). Both the engine 210 and the second motor 320 can provide kinetic energy to the wheels 500. The engine 210 is also connected to the first motor 310, and the power battery 400 is electrically connected to both the first motor 310 and the second motor 320. The engine 210 can also drive the first motor 310 to generate electricity, thereby charging the power battery 400. For example, the engine 210 can be a gasoline engine, a diesel engine, or an engine using other fuels such as methanol or ethanol. The first motor 310 can be an integrated starter generator (ISG) or a belt-driven starter generator (BSG), etc. The second motor 320 can be an AC motor, a switched reluctance motor, a DC permanent magnet motor, etc.

[0045] The vehicle controller 100 is electrically connected to the engine controller 200 and the motor controller 300, respectively. The motor controller 300 is also electrically connected to the first motor 310 and the second motor 320, respectively, and the engine controller 200 is also electrically connected to the engine 210. The vehicle controller 100 is used to output command signals to the engine controller 200 and the motor controller 300, thereby controlling the operating state of the first motor 310 and the second motor 320 through the motor controller 300, and controlling the operating state of the engine 210 through the engine controller 200, so that the hybrid vehicle 10 can operate in series operation, parallel operation, series-parallel operation, engine operation, pure electric operation, or braking operation.

[0046] like Figure 2 As shown, when the hybrid vehicle 10 is driving normally and smoothly and the power battery 400 has sufficient charge, that is, when the power demand of the hybrid vehicle 10 is less than or equal to the output power of the second motor 320, and the current remaining charge (also known as the state of charge, SOC) of the power battery 400 is greater than the remaining charge reference value (e.g., 40%), and the current allowable discharge power of the power battery 400 is greater than the allowable discharge power reference value, the vehicle controller 100 controls the hybrid vehicle 10 to operate in pure electric mode.

[0047] In pure electric mode, only the second motor 320 serves as the power source to drive the hybrid vehicle 10. At this time, since the power battery 400 has sufficient charge, and the kinetic energy output from the electrical energy supplied by the power battery 400 to the second motor 320 after energy conversion is sufficient to meet the driving needs of the hybrid vehicle 10, the engine 210 does not operate.

[0048] When the power demand of the hybrid vehicle 10 is greater than the output power of the second motor 320, or when the current remaining charge (i.e., SOC) of the power battery 400 is less than the remaining charge reference value (e.g., 40%), or when the current allowable discharge power of the power battery 400 is less than the allowable discharge power reference value, the vehicle controller 100 controls the hybrid vehicle 10 to start the engine 210, so that the hybrid vehicle 10 switches from pure electric mode to series mode, parallel mode, or series-parallel mode.

[0049] like Figure 3 As shown, in series operation, the engine 210 drives the first motor 310 to generate electricity, transferring the kinetic energy of the engine 210 to the first motor 310, causing the first motor 310 to operate in generator mode, converting the kinetic energy of the engine 210 into electrical energy to charge the power battery 400. At this time, the engine 210 does not output driving force to the wheels 500. Simultaneously, the power battery 400 supplies power to the second motor 320, causing the second motor 320 to operate in electric motor mode, converting the electrical energy output from the power battery 400 into kinetic energy and outputting it to the wheels 500, thereby driving the hybrid vehicle 10.

[0050] like Figure 4 As shown, in parallel operation, the engine 210 outputs kinetic energy to the wheels 500 to drive the hybrid vehicle 10. The power battery 400 supplies power to the second motor 320, which operates in electric motor mode to convert the electrical energy output from the power battery 400 into kinetic energy and output it to the wheels 500. At this time, the engine 210 and the second motor 320 together provide driving force to the wheels 500.

[0051] like Figure 5As shown, in the hybrid operation, the engine 210 outputs kinetic energy to the wheels 500 to drive the hybrid vehicle 10. The power battery 400 supplies power to the second motor 320, which operates in electric motor mode to convert the electrical energy output from the power battery 400 into kinetic energy and output it to the wheels 500. Furthermore, the engine 210 also drives the first motor 310 to generate electricity, transferring some of the kinetic energy of the engine 210 to the first motor 310, causing the first motor 310 to operate in generator mode to convert some of the kinetic energy of the engine 210 into electrical energy to charge the power battery 400. At this time, the engine 210 and the second motor 320 jointly provide driving force to the wheels 500, and the engine 210 also provides some kinetic energy to charge the power battery 400.

[0052] In low-temperature environments, when the power demand of the hybrid vehicle 10 is greater than the output power of the second motor 320, or when the current remaining charge (also known as the state of charge, SOC) of the power battery 400 is less than the remaining charge reference value (e.g., 40%), or when the current allowable discharge power of the power battery 400 is less than the allowable discharge power reference value, the existing hybrid vehicle will start the engine and allow the engine 210 to output a relatively large torque. At this time, due to the poor fluidity of the lubricating oil in the engine 210, the engine 210 is easily damaged due to poor lubrication.

[0053] Please see Figure 6 To address the problem that engine 210 is prone to damage due to poor lubrication when starting and outputting high torque in low-temperature environments, this application provides an engine control method, which includes the following steps:

[0054] Step 610: Obtain the current temperature of the engine 210, the current operating parameters of the power battery 400, and the battery parameter reference values. In this embodiment, the current operating parameters of the power battery 400 include the current remaining charge and the current allowable discharge power. Correspondingly, the battery parameter reference values ​​include the remaining charge reference value and the allowable discharge power reference value. Exemplarily, the current temperature of the engine 210 can be obtained by detecting the water temperature at the outlet of the engine 210 using a temperature sensor (not shown in the figure). Of course, in other embodiments, the current temperature of the engine 210 can also be detected by other methods. The remaining charge reference value and the allowable discharge power reference value can be obtained and stored through testing before the hybrid vehicle 10 leaves the factory.

[0055] At step 620, a battery parameter threshold of the power battery 400 at the current temperature is determined according to the current temperature and the battery parameter reference value. The lower the current temperature is, the greater the corresponding battery parameter threshold is.

[0056] At step 630, it is determined whether the current operating parameter of the power battery 400 is less than or equal to the battery parameter threshold. If the current operating parameter of the power battery 400 is less than or equal to the battery parameter threshold, step 640 is performed, otherwise, step 610 is returned to continue to acquire the current temperature of the engine 210, the current operating parameter of the power battery 400 and the battery parameter reference value. In the embodiment, when the current remaining power of the power battery 400 is less than or equal to the remaining power threshold at the current temperature, or the current allowable discharge power of the power battery 400 is less than or equal to the allowable discharge power threshold at the current temperature, it is determined whether the current operating parameter of the power battery 400 is less than or equal to the battery parameter threshold. In another embodiment, only the current remaining power of the power battery 400 and the remaining power threshold at the current temperature are compared, and when the current remaining power of the power battery 400 is less than or equal to the remaining power threshold at the current temperature, it is determined whether the current operating parameter of the power battery 400 is less than or equal to the battery parameter threshold. In yet another embodiment, only the current allowable discharge power of the power battery 400 and the allowable discharge power threshold at the current temperature are compared, and when the current allowable discharge power of the power battery 400 is less than or equal to the allowable discharge power threshold at the current temperature, it is determined whether the current operating parameter of the power battery 400 is less than or equal to the battery parameter threshold.

[0057] At step 640, a start signal is output to start the engine 210.

[0058] It can be understood that the lower the current temperature is, the greater the corresponding battery parameter threshold is. Therefore, in a low-temperature environment, the hybrid vehicle 10 starts the engine 210 when the driving capability of the power battery 400 is high, so that the engine 210 can avoid outputting a large torque at the start, and sufficient warm-up time is provided for the engine 210, thereby avoiding damage of the engine 210 due to poor lubrication.

[0059] Please refer to Figure 7 , Figure 7 is Figure 6 the detailed flowchart of step 620. According to the current temperature and the battery parameter reference value, the battery parameter threshold of the power battery 400 at the current temperature is determined, which specifically includes:

[0060] At step 621, a temperature coefficient corresponding to the current temperature of the power battery 400 is determined. The temperature coefficient is greater than zero, and the lower the current temperature, the greater the temperature coefficient. For example, the temperature coefficient at the current temperature can be determined by looking up a table. Specifically, a preset temperature value calibration table is obtained, and the temperature coefficient corresponding to the current temperature is determined according to the preset temperature value calibration table. The preset temperature value calibration table records the mapping relationship between a plurality of temperature data ranges and a plurality of temperature coefficients, and the preset temperature value calibration table can be obtained and saved by test before the hybrid vehicle 10 is shipped.

[0061] At step 622, the battery parameter threshold value is obtained by multiplying the battery parameter reference value and the temperature coefficient. In this embodiment, the remaining capacity threshold value at the current temperature is obtained by multiplying the remaining capacity reference value and the temperature coefficient, and the allowable discharge power threshold value at the current temperature is obtained by multiplying the current allowable discharge power and the temperature coefficient.

[0062] Referring to Figure 8 , Figure 8 is a flowchart of another engine control method provided by the embodiment. The method specifically includes the following steps:

[0063] At step 610, the current temperature of the engine 210, the current operating parameter of the power battery 400, and the battery parameter reference value are obtained. In this embodiment, the current operating parameter of the power battery 400 includes the current remaining capacity and the current allowable discharge power, and the battery parameter reference value includes the remaining capacity reference value and the allowable discharge power reference value.

[0064] At step 6211, a torque limiting value corresponding to the current temperature is determined. The lower the current temperature, the smaller the torque limiting value. For example, the torque limiting value corresponding to the current temperature can be determined by looking up a table. Specifically, a preset torque limiting value calibration table is obtained, and the torque limiting value corresponding to the current temperature is determined according to the preset torque limiting value calibration table. The preset torque limiting value calibration table records the mapping relationship between a plurality of temperature data ranges and a plurality of torque limiting values, and the preset torque limiting value calibration table can be obtained and saved by test before the hybrid vehicle 10 is shipped. For example, as shown in the torque limiting value calibration table, Figure 9 the temperature data ranges are T1-T2, T2-T3, …, Tn-1-Tn, and the corresponding torque limiting values are N1, N2, …, Nn-1, where T1<T2<T3<……<Tn-1<Tn, N1<N2<……<Nn-1. For example, T1-T2 is 0-10°C, and N1 is 100 Nm. If the current temperature is 8°C, the corresponding torque limiting value is 100 Nm.

[0065] Step 6212, determine the temperature coefficient corresponding to the limit torque value. Wherein, the smaller the limit torque value, the greater the corresponding temperature coefficient. Illustratively, the temperature coefficient corresponding to the limit torque value can be determined by table lookup, specifically, obtain a preset temperature coefficient calibration table, and determine the temperature coefficient corresponding to the limit torque value according to the temperature coefficient calibration table. The preset temperature coefficient calibration table records the mapping relationship between a plurality of limit torque data and a plurality of temperature coefficients, which can be obtained and saved by test before the hybrid vehicle 10 is shipped. For example, as shown in the temperature coefficient calibration table, the limit torque data includes N1, N2, …, Nn-1, and the corresponding temperature coefficients are k1, k2, …, kn-1, respectively, wherein N1 < N2 < … < Nn-1, k1 > k2 > … > kn-1, for example, N1 is 100 Nm, and k1 is 1.5. Figure 10

[0066] Step 622, multiply the battery parameter reference value by the temperature coefficient to obtain the battery parameter threshold value. In this embodiment, step 622 specifically includes: multiplying the remaining power reference value by the temperature coefficient to obtain the remaining power threshold value at the current temperature, and multiplying the current allowable discharge power by the temperature coefficient to obtain the allowable discharge power threshold value at the current temperature.

[0067] Step 630, determine whether the current operating parameter of the power battery 400 is less than or equal to the battery parameter threshold value. If the current operating parameter of the power battery 400 is less than or equal to the battery parameter threshold value, step 640 is executed, otherwise, return to step 610 to continue to obtain the current temperature of the engine 210, the current operating parameter of the power battery 400, and the battery parameter reference value. In this embodiment, when the current remaining power of the power battery 400 is less than or equal to the remaining power threshold value at the current temperature, or the current allowable discharge power of the power battery 400 is less than or equal to the allowable discharge power threshold value at the current temperature, it is determined whether the current operating parameter of the power battery 400 is less than or equal to the battery parameter threshold value.

[0068] Step 640, output a start signal to start the engine 210.

[0069] Step 650, control the engine 210 to operate at a torque lower than the limit torque value within a preset time after starting. Since the engine 210 is poorly lubricated in a low temperature environment, controlling the engine 210 to operate at a torque lower than the limit torque value within a preset time after starting can further protect the engine 210 from damage. Wherein, the preset time can be determined according to the time required for the engine 210 to warm up.

[0070] ​The engine control method provided in the application determines the battery parameter threshold of the power battery at the current temperature according to the current temperature and the battery parameter reference value, so that a larger battery parameter threshold is set at low temperature, and the engine 210 is started when the current operating parameter of the power battery 400 is less than or equal to the battery parameter threshold at the current temperature. In this way, in a low-temperature environment, the hybrid vehicle 10 starts the engine 210 when the driving capability of the power battery 400 is higher, which can avoid the engine 210 outputting a large torque at the start and provide sufficient warm-up time for the engine 210, thereby avoiding damage to the engine 210 due to poor lubrication.

[0071] Referring to Figure 11 Based on the same inventive concept, the application also provides a hybrid vehicle 10, which comprises an engine 210, a power battery 400, a detection unit 600, a memory 700, and a controller 800.

[0072] The detection unit is electrically connected to the engine 210 and the power battery 400, respectively, and the detection unit 600 is configured to detect the current temperature of the engine 210 and the current operating parameter of the power battery 400. The memory 700 is configured to store executable instructions. The controller 800 is electrically connected to the detection unit 600 and the memory 700, respectively, and the controller 800 is configured to acquire the current temperature of the engine 210 and the current operating parameter of the power battery 400 detected by the detection unit 600, and execute the executable instructions stored in the memory based on the current temperature and the current operating parameter, to realize the above-mentioned engine control method. Exemplarily, the detection unit 600 comprises a temperature sensor (not shown in the figure) and a battery management system (BMS), wherein the temperature sensor is configured to acquire the current temperature of the engine 210, and the battery management system is configured to acquire the current remaining capacity or the current allowable discharge power of the power battery 400. In some embodiments, the controller 800 can be a vehicle controller 100, that is, the engine control method provided in the application is executed by the vehicle controller 100, for example, Figure 6 all the steps in the embodiments shown in Figure 8 all the steps in the embodiments shown in are executed by the vehicle controller 100. In other embodiments, the controller 800 can comprise a vehicle controller 100 and an engine controller 200 that are electrically connected to each other, that is, the engine control method provided in the application is executed by the vehicle controller 100 and the engine controller 200 in cooperation, so as to Figure 8In an embodiment, the engine controller 200 is configured to acquire a current temperature of the engine 210, determine a corresponding torque limit value according to the current temperature, and output the torque limit value to the vehicle controller 100. The vehicle controller 100 is configured to acquire a current operating parameter of the power battery and a battery parameter reference value, determine a temperature coefficient according to the torque limit value, multiply the battery parameter reference value by the temperature coefficient to obtain a battery parameter threshold value, determine whether the current operating parameter of the power battery 400 is less than or equal to the battery parameter threshold value, and output a start signal to start the engine 210 when it is determined that the current operating parameter of the power battery 400 is less than or equal to the battery parameter threshold value, and control the engine 210 to operate at a torque lower than the torque limit value within a preset time after starting.

[0073] Based on the same inventive concept, the application further provides a computer readable storage medium storing executable instructions, which, when executed by a processor, implement the engine control method.

[0074] The computer storage medium of the embodiments of the application can adopt any combination of one or more computer readable media. The computer readable medium can be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium may, for example, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or apparatus, or any combination thereof. More specific examples (non-exhaustive list) of the computer readable storage medium include an electrical connection having one or more wires, a portable computer diskette, 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. In this document, the computer readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, device or apparatus.

[0075] The computer readable signal medium can include a data signal propagated in a baseband or as a part of a carrier wave, in which a computer readable program code is carried. Such a propagated data signal can take various forms, including but not limited to an electromagnetic signal, an optical signal or any suitable combination thereof. The computer readable signal medium can also be any computer readable medium that is not a computer readable storage medium and that can transmit, propagate or transport a program for use by or in connection with an instruction execution system, device or apparatus.

[0076] The computer readable media on which the program code can be carried by any suitable medium, including but not limited to wireless, wired, optical fiber cable, RF, and the like, or any suitable combination of the foregoing.

[0077] Computer program code for carrying out operations of the present application can be written in any suitable programming language including object oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer, or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider).

[0078] While embodiments of the application have been shown and described, it is to be understood that various modifications, substitutions, combinations, and variations can be made by those skilled in the art without departing from the spirit and scope of the application, which is defined by the following claims and their equivalents.

Claims

1. An engine control method applied to a hybrid vehicle including an engine and a power storage device, characterized by, The method comprises: obtaining a current temperature of the engine, a current operating parameter of the power battery, and a battery parameter reference value; determining a battery parameter threshold of the power battery at the current temperature according to the current temperature and the battery parameter reference value; wherein the lower the current temperature, the greater the corresponding battery parameter threshold; judging whether the current operating parameter is less than or equal to the battery parameter threshold; and if the current operating parameter is less than or equal to the battery parameter threshold, outputting a starting signal to start the engine; the determining of the battery parameter threshold of the power battery at the current temperature according to the current temperature and the battery parameter reference value comprises: determining a temperature coefficient corresponding to the current temperature according to the current temperature; and multiplying the battery parameter reference value by the temperature coefficient to obtain the battery parameter threshold; the determining of the temperature coefficient corresponding to the current temperature comprises: determining a torque limit value corresponding to the current temperature according to the current temperature; and determining the temperature coefficient corresponding to the torque limit value according to the torque limit value; the lower the current temperature, the smaller the corresponding torque limit value; and the smaller the torque limit value, the greater the corresponding temperature coefficient.

2. The engine control method according to claim 1, characterized by, the determining of the torque limit value corresponding to the current temperature comprises: obtaining a preset torque limit value calibration table; wherein the preset torque limit value calibration table records a mapping relationship between a plurality of temperature data ranges and a plurality of torque limit values; and determining the torque limit value corresponding to the current temperature according to the preset torque limit value calibration table.

3. The engine control method according to claim 1, characterized by, the determining of the temperature coefficient corresponding to the torque limit value comprises: obtaining a preset temperature coefficient calibration table; wherein the preset temperature coefficient calibration table records a mapping relationship between a plurality of torque limit data and a plurality of temperature coefficients; and determining the temperature coefficient corresponding to the torque limit value according to the preset temperature coefficient calibration table.

4. The engine control method according to claim 1, characterized by, The current operating parameter of the power battery comprises a current remaining power, the battery parameter reference value comprises a remaining power reference value, and the battery parameter threshold comprises a remaining power threshold.

5. The engine control method according to claim 1, characterized by, The current operating parameter of the power battery comprises a current allowable discharge power, the battery parameter reference value comprises an allowable discharge power reference value, and the battery parameter threshold comprises an allowable discharge power threshold.

6. A hybrid vehicle characterized by comprising: The method comprises: an engine and a power battery; a detection unit electrically connected to the engine and the power battery respectively, the detection unit being configured to detect a current temperature of the engine and a current operating parameter of the power battery; a memory configured to store executable instructions; and a controller electrically connected to the detection unit and the memory respectively, the controller being configured to obtain the current temperature of the engine and the current operating parameter of the power battery detected by the detection unit, and execute the executable instructions stored in the memory based on the current temperature and the current operating parameter, so as to implement the method of any one of claims 1 to 5.

7. A computer readable storage medium characterized by The memory stores executable instructions, and the executable instructions are executed by the processor to implement the method of any one of claims 1 to 5.

Images