Vehicle control methods and devices, vehicles, and readable storage media

Abstract

This invention provides a vehicle control method and device, a vehicle, and a readable storage medium. Belonging to the field of vehicle technology, the vehicle control method provided by this invention is used to control the variable valve timing (VVT) system on a vehicle. The method includes: acquiring the engine speed and engine coolant temperature when the vehicle is in P or N gear. If the engine speed is within a preset range, the engine speed is decreasing, and the engine coolant temperature is below a preset temperature, then the VVT ​​phase is controlled at its initial phase. This invention controls the VVT ​​phase at its initial phase under specific operating conditions, thus avoiding VVT phase adjustment and effectively preventing abnormal noise problems.

Description

Technical Field

[0001] This invention belongs to the field of vehicle technology, and more specifically, relates to a vehicle control method and device, a vehicle, and a readable storage medium. Background Technology

[0002] When a vehicle is idling and cold, shaking the accelerator pedal will cause the engine speed to rise continuously. Once the engine speed reaches a certain level, releasing the accelerator and causing the speed to drop will produce a "crackling" noise from the engine. Therefore, this invention aims to provide a solution to this noise problem. Summary of the Invention

[0003] The purpose of this invention is to provide a vehicle control method and device, a vehicle, and a readable storage medium to solve the problem of abnormal engine noise in the prior art.

[0004] A first aspect of the present invention provides a vehicle control method for controlling a variable valve timing (VVT) system on a vehicle, comprising:

[0005] When the vehicle is in P or N gear, obtain the engine speed and engine coolant temperature of the vehicle;

[0006] If the engine speed is within a preset speed range, the engine speed is decreasing, and the engine coolant temperature is lower than a preset temperature, then the phase of the VVT ​​will be controlled at its initial phase.

[0007] In one possible implementation, the method for determining whether the engine speed is decreasing is as follows:

[0008] The duration of the engine speed increase is detected;

[0009] If the duration of the engine speed increase is less than the first preset duration, then the engine speed is determined to be in a downward trend.

[0010] In one possible implementation, detecting the duration of the engine speed increase includes:

[0011] The duration of the engine speed increase is detected based on the change in engine speed;

[0012] Alternatively, the accelerator pedal opening and / or throttle opening of the vehicle can be obtained, and the duration of the engine speed increase can be detected based on the changes in the accelerator pedal opening and / or throttle opening.

[0013] In one possible implementation, the vehicle control method further includes:

[0014] If the engine speed is not within the preset speed range, or the engine speed is not decreasing, or the engine coolant temperature is greater than or equal to the preset temperature, then the VVT ​​is controlled based on the engine load and the engine speed.

[0015] In one possible implementation, controlling the VVT ​​based on the engine load and the engine speed includes:

[0016] If the load on the engine is less than the preset load, the phase of the VVT ​​is advanced.

[0017] If the engine load is greater than or equal to the preset load and the engine speed is less than the preset speed, then the VVT ​​phase is advanced.

[0018] Wherein, the first phase advance amplitude is less than the second phase advance amplitude, the first phase advance amplitude is the amplitude of VVT phase advance when the engine load is less than the preset load, and the second phase advance amplitude is the amplitude of VVT phase advance when the engine load is greater than or equal to the preset load.

[0019] If the engine load is greater than or equal to a preset load and the engine speed is greater than or equal to a preset speed, then the phase of the VVT ​​is delayed.

[0020] In one possible implementation, the method for determining the preset speed range is as follows:

[0021] Obtain the pre-measured speed range in which the vehicle produces abnormal noise;

[0022] The preset speed range is determined based on the speed range and the preset speed increment.

[0023] In one possible implementation, determining the preset speed range based on the speed range and the preset speed increment includes:

[0024] The preset speed increment is superimposed on the maximum value of the speed range to obtain the preset speed range.

[0025] A second aspect of the present invention provides a vehicle control device for controlling a variable valve timing (VVT) system on a vehicle, the vehicle control device comprising:

[0026] The data acquisition module is used to acquire the engine speed and engine coolant temperature of the vehicle when the vehicle is in P or N gear.

[0027] The vehicle control module is used to control the phase of the VVT ​​to its initial phase when the engine speed is within a preset speed range, the engine speed is decreasing, and the engine coolant temperature is lower than a preset temperature.

[0028] A third aspect of the present invention provides a vehicle, the vehicle including a control terminal, the control terminal including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the vehicle control method described above.

[0029] In a fourth aspect, the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the vehicle control method described above.

[0030] The beneficial effects of the vehicle control method and apparatus, vehicle, and readable storage medium provided in the embodiments of the present invention are as follows:

[0031] First, the present invention investigated the cause of the aforementioned abnormal noise and found that it was caused by the VVT ​​(Variable Valve Timing) system. Based on this, the inventors of this application analyzed and found that the abnormal noise from the VVT ​​was caused by the following: When the engine is cold, the oil viscosity is high during the VVT's return to its initial position (the VVT ​​phaser returns to its initial position as the engine speed drops to idle), making it difficult for oil to flow into the VVT ​​phaser. Furthermore, because the VVT ​​actually moves too quickly during the return (for example, the VVT ​​phase adjusts by 46° within 0.4 seconds), the oil supply is easily insufficient. At this time, the VVT ​​phaser will draw in air through the gaps. Then, under the positive and negative torque of the VVT ​​camshaft, the VVT ​​rotor moves and beats the oil, causing the abnormal noise.

[0032] Based on the above analysis results, this embodiment of the invention provides a solution to the aforementioned abnormal noise problem. Specifically, when the vehicle is in P or N gear, the engine speed and engine coolant temperature are used to determine whether the vehicle is in a condition where abnormal noise may occur. If it is determined that the vehicle is in a condition where abnormal noise may occur (i.e., the engine speed is within a preset speed range, the engine speed is decreasing, and the engine coolant temperature is lower than a preset temperature), then the VVT ​​phaser is fixed in its initial position, that is, the VVT ​​phase is controlled at its initial phase. At this time, no VVT phase adjustment is performed, and there will be no insufficient oil supply, VVT return too quickly, air entering the VVT ​​phaser and splashing the oil, etc., thus solving the aforementioned abnormal noise problem.

[0033] In summary, the inventors of this application have effectively analyzed the abnormal noise problem, identified its root cause, and, based on this, effectively solved the noise problem by improving the VVT ​​control strategy. Furthermore, since this embodiment of the invention controls the VVT ​​phase to its initial phase, it also achieves fuel efficiency. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic flowchart of a vehicle control method provided in an embodiment of the present invention;

[0036] Figure 2 This is a schematic flowchart of a vehicle control method provided in an embodiment of the present invention;

[0037] Figure 3 This is a structural block diagram of a vehicle control device provided in an embodiment of the present invention;

[0038] Figure 4 This is a schematic block diagram of a control terminal provided in an embodiment of the present invention. Detailed Implementation

[0039] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0040] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0041] To address the abnormal noise issue, this invention first investigated the cause of the noise and found that it originated from the VVT ​​(Variable Valve Timing) system. Based on this, the inventors of this application analyzed the cause of the VVT ​​noise and found that: when the engine is cold, the oil viscosity is high during the VVT's return to its initial position (the VVT ​​phaser returns to its initial position as the engine speed drops to idle), making it difficult for oil to flow into the VVT ​​phaser. Furthermore, because the VVT ​​actually moves too quickly during the return (for example, the VVT ​​phase adjusts by 46° within 0.4 seconds), the oil supply is easily insufficient. At this time, the VVT ​​phaser may draw in air through gaps. Then, under the positive and negative torque of the VVT ​​camshaft, the VVT ​​rotor moves and beats the oil, causing the abnormal noise.

[0042] Based on this, embodiments of the present invention provide a solution to avoid abnormal noise problems by improving the VVT ​​control strategy. In other words, the vehicle control method provided by embodiments of the present invention is used to control the variable valve timing system (VVT) in a vehicle. For further information, please refer to... Figure 1 , Figure 1 This is a flowchart illustrating a vehicle control method according to an embodiment of the present invention. The vehicle control method includes:

[0043] S101: When the vehicle is in P or N gear, obtain the vehicle's engine speed and engine coolant temperature.

[0044] In this embodiment, considering that the above-mentioned abnormal noise problem occurs when the vehicle is parked, the embodiment of the present invention will detect the vehicle's gear position. The engine speed and engine coolant temperature will only be obtained when the vehicle is in P gear (i.e., parking gear) or N gear (i.e., neutral gear) to determine the abnormal noise condition.

[0045] In this embodiment, the engine speed can be obtained from a speed sensor preset on the engine, or the accelerator pedal opening and / or throttle opening can be obtained from the vehicle's communication bus. The engine speed is calculated using the accelerator pedal opening and / or throttle opening. This embodiment of the invention does not limit the specific method used.

[0046] In this embodiment, the engine coolant temperature can be obtained directly from the corresponding temperature sensor.

[0047] S102: If the engine speed is within the preset speed range, the engine speed is decreasing, and the engine coolant temperature is lower than the preset temperature, then the phase of VVT will be controlled at its initial phase.

[0048] In this embodiment, a preset speed range can be determined in advance based on the measurement data during the vehicle test.

[0049] In this embodiment, if the engine speed is within a preset speed range and the engine speed is decreasing, the VVT ​​phase will return to its original position according to the existing VVT control strategy. If the engine coolant temperature is low (below the preset temperature), the engine oil will not easily flow into the VVT ​​phaser. Therefore, based on the analysis of the above-mentioned abnormal noise problem, it can be seen that when the engine speed is within the preset speed range, the engine speed is decreasing, and the engine coolant temperature is below the preset temperature, abnormal noise is very likely to occur. In this case, to avoid abnormal noise, this embodiment of the invention controls the VVT ​​phaser to fix the VVT ​​phaser in its initial position, that is, to control the VVT ​​phase at its initial phase. For example, if the initial phase of the VVT ​​(or the phase when the VVT ​​is not operating) is 5°, then the VVT ​​phase is fixed at 5°. Based on this, this embodiment of the invention can avoid situations such as insufficient engine oil supply, excessively fast VVT return, and air entering the VVT ​​phaser and splashing oil, thus solving the abnormal noise problem when the VVT ​​rotor is operating.

[0050] As can be seen from the above description, the embodiments of the present invention provide a solution to the above-mentioned abnormal noise problem. That is, when the vehicle is in P or N gear, the engine speed and engine coolant temperature are used to determine whether the vehicle is in a condition where abnormal noise may occur. If it is determined that the vehicle is in a condition where abnormal noise may occur (that is, when the engine speed is within a preset speed range, the engine speed is decreasing, and the engine coolant temperature is lower than a preset temperature), the VVT ​​phaser is fixed in its initial position, that is, the VVT ​​phase is controlled in its initial phase. At this time, no VVT phase adjustment is performed, and there will be no insufficient oil supply, VVT return too fast, air entering the VVT ​​phaser and splashing the oil, etc., thus solving the above-mentioned abnormal noise problem.

[0051] In summary, the inventors of this application have effectively analyzed the abnormal noise problem, identified its root cause, and, based on this, effectively solved the noise problem by improving the VVT ​​control strategy. Furthermore, since this embodiment of the invention controls the VVT ​​phase to its initial phase, it also achieves fuel efficiency.

[0052] In one possible implementation, the method for determining whether the engine speed is decreasing is as follows:

[0053] Detect the duration of the engine speed increase.

[0054] If the duration of the engine speed increase is less than the first preset duration, then the engine speed is determined to be in a downward trend.

[0055] In this embodiment, considering that the decrease in engine speed is an uncontrolled process, it would be inaccurate to judge whether the engine speed is in a downward trend based on the pattern of engine speed decrease. Therefore, this embodiment of the invention judges whether the engine speed is in a downward trend based on a controlled process. That is, this embodiment of the invention will detect the duration of the increase in engine speed. If the duration is very short (that is, the duration is less than the preset duration), then the engine speed is considered to be in a downward trend.

[0056] In this embodiment, the duration of the engine speed increase can also be understood as the duration of the engine speed increase, that is, the duration during which the engine speed continuously increases without decreasing. If the engine speed begins to decrease after continuously increasing for a period of time, then the aforementioned duration or maintenance duration stops timing.

[0057] In one possible implementation, detecting the duration of the engine speed increase includes:

[0058] The duration of the engine speed increase is detected based on changes in engine speed.

[0059] Alternatively, the accelerator pedal opening and / or throttle opening of the vehicle can be obtained, and the duration of the engine speed increase can be detected based on the changes in accelerator pedal opening and / or throttle opening.

[0060] In this embodiment, the duration of the engine speed increase can be calculated directly based on the change in engine speed obtained in step S101, or the duration of the engine speed increase can be detected based on the change in accelerator pedal opening and / or throttle opening.

[0061] In this embodiment, "detecting the duration of engine speed increase based on changes in accelerator pedal opening and / or throttle opening" can detect the trend of engine speed change more promptly and more accurately identify the vehicle user's "shaking accelerator pedal" action, thus more effectively avoiding abnormal noises.

[0062] In one possible implementation, the vehicle control method further includes:

[0063] If the engine speed is not within the preset speed range, or the engine speed is not decreasing, or the engine coolant temperature is greater than or equal to the preset temperature, then VVT is controlled based on the engine load and engine speed.

[0064] In this embodiment, if the vehicle is not in a condition where abnormal noise may occur (i.e., the engine speed is not within the preset speed range, or the engine speed is not decreasing, or the engine coolant temperature is greater than or equal to the preset temperature), the VVT ​​phase can be adjusted directly in combination with the engine load and speed.

[0065] Based on the above embodiments, the vehicle control method provided by the present invention can be referred to... Figure 2 ,like Figure 2 As shown in steps S201 to S208, if the vehicle is in a condition where abnormal noise may occur, the VVT ​​phaser is fixed in its initial position; if the vehicle is not in a condition where abnormal noise may occur, the VVT ​​phase is adjusted according to the engine speed and engine load.

[0066] In one possible implementation, VVT is controlled based on engine load and engine speed, including:

[0067] If the engine load is less than the preset load, the phase of the VVT ​​will be advanced.

[0068] If the engine load is greater than or equal to the preset load and the engine speed is less than the preset speed, the phase of the VVT ​​will be advanced.

[0069] The first phase advance amplitude is less than the second phase advance amplitude. The first phase advance amplitude is the amplitude of VVT phase advance when the engine load is less than the preset load, and the second phase advance amplitude is the amplitude of VVT phase advance when the engine load is greater than or equal to the preset load.

[0070] If the engine load is greater than or equal to the preset load and the engine speed is greater than or equal to the preset speed, the phase of the VVT ​​control is delayed.

[0071] In this embodiment, the engine operating conditions and VVT phase adjustment strategy are shown in Table 1 below:

[0072] Table 1. Correspondence between engine operating conditions and VVT phase adjustment strategies

[0073] Engine operating conditions VVT phase adjustment strategy Medium and low load Increase the overlap angle and slightly advance the phase. High load, medium and low speed Increase overlap angle and advance phase High load, high speed Phase delay

[0074] In Table 1, "low load" corresponds to the engine load being less than the preset load as described in the embodiments of the present invention, "high load" corresponds to the engine load being greater than or equal to the preset load as described in the embodiments of the present invention, "low speed" corresponds to the engine speed being less than the preset speed in the embodiments of the present invention, and "high speed" corresponds to the engine speed being greater than or equal to the preset speed in the embodiments of the present invention. The overlap angle in Table 1 refers to the overlap angle of the VVT ​​valves. Through the VVT ​​phase adjustment strategy described in the embodiments of the present invention, the engine valve timing phase can be changed, thereby improving engine power.

[0075] In one possible implementation, the preset speed range is determined as follows:

[0076] Obtain the pre-measured speed range in which the vehicle makes abnormal noises.

[0077] The preset speed range is determined based on the speed range and the preset speed increment.

[0078] In this embodiment, the speed range in which the vehicle makes abnormal noise basically corresponds to the vehicle's normal idling speed range. However, this embodiment of the invention takes into account that when the vehicle user throttles, the engine speed may exceed the normal idling speed range, that is, the engine speed may be higher than the idling speed. In this case, abnormal noise may also occur. Therefore, this embodiment of the invention considers superimposing speed increments on the speed range to determine the preset speed range, thereby effectively avoiding the occurrence of abnormal noise problems.

[0079] In one possible implementation, the preset speed range is determined based on the speed range and a preset speed increment, including:

[0080] The preset speed increment is added to the maximum value of the speed range to obtain the preset speed range.

[0081] In this embodiment, if the rotational speed range is (v1, v2) and the preset rotational speed increment is Δv, then the preset rotational speed range can be (v1, v2 + Δv).

[0082] In summary, the embodiments of the present invention maintain the VVT ​​phase at its initial phase under operating conditions where abnormal noise may occur, thus resolving the abnormal noise problem. Furthermore, since the embodiments of the present invention control the VVT ​​phase at its initial phase, they also achieve fuel efficiency.

[0083] Corresponding to the vehicle control method in the above embodiments, Figure 3 This is a structural block diagram of a vehicle control device according to an embodiment of the present invention. For ease of explanation, only the parts relevant to this embodiment are shown. The vehicle control device provided in this embodiment is used to control the variable valve timing system (VVT) on a vehicle. Please refer to [link / reference]. Figure 3 The vehicle control device 20 includes a data acquisition module 21 and a vehicle control module 22.

[0084] The data acquisition module 21 is used to acquire the engine speed and engine coolant temperature of the vehicle when the vehicle is in P or N gear.

[0085] The vehicle control module 22 is used to control the phase of VVT to its initial phase when the engine speed is within a preset speed range, the engine speed is decreasing, and the engine coolant temperature is lower than a preset temperature.

[0086] In one possible implementation, the vehicle control module 22 is further used to determine whether the engine speed is decreasing. The method for determining whether the engine speed is decreasing is as follows:

[0087] Detect the duration of the engine speed increase.

[0088] If the duration of the engine speed increase is less than the first preset duration, then the engine speed is determined to be in a downward trend.

[0089] In one possible implementation, the vehicle control module 22 is specifically used for:

[0090] The duration of the engine speed increase is detected based on changes in engine speed.

[0091] Alternatively, the accelerator pedal opening and / or throttle opening of the vehicle can be obtained, and the duration of the engine speed increase can be detected based on the changes in accelerator pedal opening and / or throttle opening.

[0092] In one possible implementation, the vehicle control module 22 is also used for:

[0093] When the engine speed is not within the preset speed range, or the engine speed is not decreasing, or the engine coolant temperature is greater than or equal to the preset temperature, VVT is controlled based on the engine load and engine speed.

[0094] In one possible implementation, the vehicle control module 22 is specifically used for:

[0095] If the engine load is less than the preset load, the phase of the VVT ​​will be advanced.

[0096] If the engine load is greater than or equal to the preset load and the engine speed is less than the preset speed, the phase of the VVT ​​will be advanced.

[0097] The first phase advance amplitude is less than the second phase advance amplitude. The first phase advance amplitude is the amplitude of VVT phase advance when the engine load is less than the preset load, and the second phase advance amplitude is the amplitude of VVT phase advance when the engine load is greater than or equal to the preset load.

[0098] If the engine load is greater than or equal to the preset load and the engine speed is greater than or equal to the preset speed, the phase of the VVT ​​control is delayed.

[0099] In one possible implementation, the vehicle control module 22 is further configured to determine a preset speed range, wherein the preset speed range is determined by:

[0100] Obtain the pre-measured speed range in which the vehicle makes abnormal noises.

[0101] The preset speed range is determined based on the speed range and the preset speed increment.

[0102] In one possible implementation, the vehicle control module 22 is specifically used for:

[0103] The preset speed increment is added to the maximum value of the speed range to obtain the preset speed range.

[0104] This invention also provides a vehicle, which includes a control terminal, see below. Figure 4 , Figure 4 This is a schematic block diagram of a control terminal provided in an embodiment of the present invention. Figure 4 The terminal 300 in this embodiment may include one or more processors 301, one or more input devices 302, one or more output devices 303, and one or more memories 304. The processors 301, input devices 302, output devices 303, and memories 304 communicate with each other via a communication bus 305. The memories 304 store computer programs, including program instructions. The processors 301 execute the program instructions stored in the memories 304. Specifically, the processors 301 are configured to invoke the program instructions to perform the functions of the modules / units in the above-described device embodiments, such as... Figure 3 The functions of modules 21 and 22 shown.

[0105] It should be understood that, in this embodiment of the invention, the processor 301 may be a Central Processing Unit (CPU), but it may also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0106] Input device 302 may include a touchpad, a fingerprint sensor (for collecting the user's fingerprint information and fingerprint orientation information), a microphone, etc., and output device 303 may include a display (LCD, etc.), a speaker, etc.

[0107] The memory 304 may include read-only memory and random access memory, and provides instructions and data to the processor 301. A portion of the memory 304 may also include non-volatile random access memory. For example, the memory 304 may also store device type information.

[0108] In specific implementations, the processor 301, input device 302, and output device 303 described in the embodiments of the present invention can execute the implementation methods described in the first and second embodiments of the vehicle control method provided in the embodiments of the present invention, or they can execute the implementation methods of the terminal described in the embodiments of the present invention, which will not be repeated here.

[0109] In another embodiment of the present invention, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program, which includes program instructions. When executed by a processor, the program instructions implement all or part of the processes in the methods described above. The computer program can also instruct related hardware to complete the process. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0110] The computer-readable storage medium can be an internal storage unit of the terminal in any of the foregoing embodiments, such as the terminal's hard disk or memory. The computer-readable storage medium can also be an external storage device of the terminal, such as a plug-in hard disk, smart media card (SMC), secure digital card (SD), flash card, etc., equipped on the terminal. Furthermore, the computer-readable storage medium can include both internal storage units and external storage devices of the terminal. The computer-readable storage medium is used to store computer programs and other programs and data required by the terminal. The computer-readable storage medium can also be used to temporarily store data that has been output or will be output.

[0111] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0112] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the terminals and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0113] In the several embodiments provided in this application, it should be understood that the disclosed terminals and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces or units, or it may be an electrical, mechanical, or other form of connection.

[0114] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the embodiments of the present invention, depending on actual needs.

[0115] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0116] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A vehicle control method, characterized in that, The vehicle control method is used to control the variable valve timing system (VVT) on a vehicle, and the vehicle control method includes: When the vehicle is in P or N gear, obtain the engine speed and engine coolant temperature of the vehicle; If the engine speed is within a preset speed range, the engine speed is decreasing, and the engine coolant temperature is lower than a preset temperature, then the phase of the VVT ​​will be controlled at its initial phase. It also includes: if the engine speed is not within the preset speed range, or the engine speed is not decreasing, or the engine coolant temperature is greater than or equal to the preset temperature, then the VVT ​​is controlled based on the engine load and the engine speed.

2. The vehicle control method as described in claim 1, characterized in that, The method for determining whether the engine speed is decreasing is as follows: The duration of the engine speed increase is detected; If the duration of the engine speed increase is less than the first preset duration, then the engine speed is determined to be in a downward trend.

3. The vehicle control method as described in claim 2, characterized in that, The detection of the duration of the engine speed increase includes: The duration of the engine speed increase is detected based on the change in engine speed; Alternatively, the accelerator pedal opening and / or throttle opening of the vehicle can be obtained, and the duration of the engine speed increase can be detected based on the changes in the accelerator pedal opening and / or throttle opening.

4. The vehicle control method as described in claim 1, characterized in that, The control of the VVT ​​based on the engine load and the engine speed includes: If the load on the engine is less than the preset load, the phase of the VVT ​​is advanced. If the engine load is greater than or equal to the preset load and the engine speed is less than the preset speed, then the VVT ​​phase is advanced. Wherein, the first phase advance amplitude is less than the second phase advance amplitude, the first phase advance amplitude is the amplitude of VVT phase advance when the engine load is less than the preset load, and the second phase advance amplitude is the amplitude of VVT phase advance when the engine load is greater than or equal to the preset load; If the engine load is greater than or equal to a preset load and the engine speed is greater than or equal to a preset speed, then the phase of the VVT ​​is delayed.

5. The vehicle control method as described in claim 1, characterized in that, The method for determining the preset speed range is as follows: Obtain the pre-measured speed range in which the vehicle produces abnormal noise; The preset speed range is determined based on the speed range and the preset speed increment.

6. The vehicle control method as described in claim 5, characterized in that, Determining the preset speed range based on the speed range and the preset speed increment includes: The preset speed increment is superimposed on the maximum value of the speed range to obtain the preset speed range.

7. A vehicle control device, characterized in that, The vehicle control device is used to control the variable valve timing system (VVT) on the vehicle, and the vehicle control device includes: The data acquisition module is used to acquire the engine speed and engine coolant temperature of the vehicle when the vehicle is in P or N gear. The vehicle control module is used to control the phase of the VVT ​​to its initial phase when the engine speed is within a preset speed range, the engine speed is decreasing, and the engine coolant temperature is less than a preset temperature. It is also used to control the VVT ​​based on the engine load and the engine speed when the engine speed is not within the preset speed range, or the engine speed is not decreasing, or the engine coolant temperature is greater than or equal to the preset temperature.

8. A vehicle, characterized in that, include: Control terminal; The control terminal includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the method as described in any one of claims 1 to 6.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1 to 6.

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