Method and system for preventing wear of engine bearing bush of series-parallel hybrid vehicle

Abstract

The application discloses a kind of series-parallel hybrid vehicle engine bush wear-preventing control method and system, method includes the following steps: obtaining the maximum vibration frequency corresponding to each vibration amplitude of hybrid vehicle engine cylinder body;Obtain the vibration frequency corresponding to the unacceptable wear thickness value of the oil film between crankshaft and bush when engine assembly is in different acceleration conditions;Periodically obtain the vibration amplitude of engine cylinder body under normal driving conditions of hybrid vehicle;Obtain the damage value of engine bush;According to the damage value of the obtained engine bush, control is executed different wear control strategy.The series-parallel hybrid vehicle engine bush wear-preventing control method provided in the application effectively avoids the occurrence of the problem of bush wear caused by excessive consumption of the oil film between the crankshaft and the bush.

Description

Technical Field

[0001] This invention relates to the field of hybrid vehicle technology, specifically to a method and system for preventing wear on bearings of a series-parallel hybrid vehicle engine. Background Technology

[0002] During the operation of range-extended or plug-in hybrid electric vehicles, due to their large battery capacity, there are two operating conditions: (1) The user's commute to and from work is relatively short, and the electric vehicle is driven in pure electric mode. After get off work, it is charged and then used repeatedly. The engine is often not in operation. (2) In some urban road conditions, the user starts driving in pure electric mode. When the battery SOC is too low, the engine starts to charge the battery. If there is a traffic jam, the battery power is not consumed. The engine charges the battery to a certain level and then stops. After the car has traveled a certain distance, the battery SOC is too low and the engine starts to charge it. During this process, the engine often starts and stops, and the car travels a certain distance during the start-stop process.

[0003] In both of the above operating conditions, the engine may fail while the vehicle is in motion. The engine receives excitation from the electric motor and the impact between the tires and the ground. There is a gap between the crankshaft and the bearings. Under external excitation, there is relative movement between the crankshaft and the bearings. Previously, when the engine was running, there was oil supplied by the oil pump between the crankshaft and the bearings, resulting in fluid lubrication. Now, without oil, the crankshaft and bearings transition from fluid lubrication to boundary lubrication and then to dry friction under vibration, leading to fretting wear. If the crankshaft and bearings are in a state of dry friction, the engine cylinder pressure is high at the moment of engine start-up, and the load between the crankshaft and the bearings is extremely large, which can easily lead to bearing failure and subsequent engine failure. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the above-mentioned background technology and provide a method and system for preventing wear of bearings in series-parallel hybrid vehicle engines.

[0005] In a first aspect, this application provides a method for preventing wear on bearings of a series-parallel hybrid vehicle engine, comprising the following steps:

[0006] Obtain the maximum vibration frequency corresponding to each vibration amplitude of the cylinder block of a hybrid vehicle engine;

[0007] Referring to the maximum vibration frequency corresponding to each vibration amplitude, the engine assembly is subjected to vibration durability test to obtain the number of cylinder block vibrations near the engine bearing housing when the oil film between the crankshaft and bearing reaches an unacceptable wear thickness value under different acceleration conditions.

[0008] Using engine shutdown and electric motor operation as trigger conditions, the vibration amplitude of the engine cylinder block under normal driving conditions of hybrid vehicles is periodically acquired;

[0009] Based on vibration durability tests conducted on the engine block under different acceleration conditions, the number of vibrations corresponding to the oil film between the crankshaft and bearing reaching an unacceptable wear thickness value, and the periodically acquired vibration amplitude of the engine block under normal driving conditions of the hybrid vehicle, the damage value of the engine bearing is obtained.

[0010] Based on the obtained engine bearing damage values, different wear control strategies are implemented.

[0011] According to the first aspect, in a first possible implementation of the first aspect, the step of obtaining the maximum vibration frequency corresponding to each vibration amplitude of the hybrid vehicle engine cylinder block specifically includes the following steps:

[0012] The hybrid vehicle was driven in pure electric mode on various road surfaces in the road test track according to the powertrain vehicle durability standard, and the time curve of cylinder block vibration acceleration near the engine bearing housing was obtained.

[0013] The vibration amplitude of the cylinder block vibration acceleration time curve near the engine bearing housing is calculated to obtain the vibration amplitude and vibration frequency distribution map of the cylinder block near the engine bearing housing.

[0014] Based on the obtained vibration amplitude and frequency distribution diagram of the cylinder block near the engine bearing housing, the maximum vibration frequency corresponding to each vibration amplitude of the cylinder block near the engine bearing housing is obtained.

[0015] According to the first aspect, in the second possible implementation of the first aspect, the step of conducting a vibration durability test on the engine assembly by referring to the maximum vibration frequency corresponding to each vibration amplitude, and obtaining the number of cylinder block vibrations near the engine bearing housing when the oil film between the crankshaft and the bearing reaches an unacceptable wear thickness value under different acceleration conditions, specifically includes the following steps:

[0016] Obtain engine bearing wear test data, which includes the thickness value of the oil film between the engine crankshaft and the bearing where unacceptable wear occurs;

[0017] Based on the maximum vibration frequency corresponding to each vibration amplitude of the hybrid vehicle engine cylinder block and the thickness value of the oil film between the engine crankshaft and bearings at which unacceptable wear occurs, the number of engine cylinder block vibrations corresponding to the thickness value of the oil film between the crankshaft and bearings reaching unacceptable wear is obtained during vibration durability testing of the engine assembly under different acceleration conditions.

[0018] According to the first aspect, in the third possible implementation of the first aspect, the step of obtaining the damage value of the engine bearing based on the vibration durability test of the engine block under different acceleration conditions, the vibration number corresponding to the oil film between the crankshaft and the bearing reaching an unacceptable wear thickness value, and the periodically acquired vibration amplitude of the engine block under normal driving conditions of the hybrid vehicle, specifically includes the following steps:

[0019] Vibration durability tests were conducted on the engine block under different acceleration conditions. The number of vibrations corresponding to the point where the oil film between the crankshaft and bearings reached an unacceptable wear thickness was recorded. The vibration amplitude of the engine block under normal driving conditions of the hybrid vehicle was also periodically acquired. The bearing damage value of the engine block under normal driving conditions of the hybrid vehicle was calculated in each time block according to the following formula:

[0020] S i =N 0.1i / N 0.1 +N 0.2i / N 0.2 +……+N ni / N n ;

[0021] Where, N 0.1i S represents the number of engine cylinder vibrations at 0.1g acceleration within the i-th time data block. i is the engine oil film damage value corresponding to the i-th time data block, and n is the upper limit of the acceleration of the engine assembly under normal driving conditions;

[0022] Based on the obtained bearing damage values ​​of the engine cylinder block in each time block under normal driving conditions of the hybrid vehicle, the total damage S of the engine oil film under normal driving conditions of the hybrid vehicle is obtained:

[0023] S = S1 + S2 + ... + S i .

[0024] According to the first aspect, in a fourth possible implementation of the first aspect, the step of controlling the execution of different wear control strategies based on the acquired engine oil film damage value specifically includes the following steps:

[0025] When the engine is running and the electric motor is stopped, if the engine bearing damage value reaches 1, the control will compensate for the oil supply between the crankshaft and the bearing.

[0026] According to the fourth possible implementation of the first aspect, in the fifth possible implementation of the first aspect, the step of controlling the oil supply compensation between the crankshaft and the bearing specifically includes the following steps:

[0027] By controlling the generator to reverse the crankshaft, the oil pump is driven to compensate for the oil supply between the crankshaft and the bearing.

[0028] According to the fourth possible implementation of the first aspect, in the sixth possible implementation of the first aspect, after the step of controlling the execution of different wear control strategies based on the acquired engine bearing damage value, the following steps are further included:

[0029] When the engine is running and the electric motor is stopped, if the engine cylinder block crankshaft damage value is less than 1, the engine bearing damage value is set to 0.

[0030] Secondly, this application provides a series-parallel hybrid vehicle engine bearing anti-wear control system, characterized in that it includes:

[0031] The vibration test data acquisition module is used to acquire the maximum vibration frequency corresponding to each vibration amplitude of the hybrid vehicle engine cylinder block;

[0032] The vibration durability test data acquisition module is communicatively connected to the vibration test data acquisition module. It is used to refer to the maximum vibration frequency corresponding to each vibration amplitude to conduct a vibration durability test on the engine assembly and obtain the number of cylinder block vibrations near the engine bearing housing when the oil film between the crankshaft and the bearing reaches an unacceptable wear thickness value under different acceleration conditions.

[0033] The engine cylinder block vibration data acquisition module is used to periodically acquire the vibration amplitude of the engine cylinder block under normal driving conditions of hybrid vehicles, triggered by engine shutdown and electric motor operation.

[0034] The loss value acquisition module is communicatively connected to the vibration durability test data acquisition module and the engine cylinder vibration data acquisition module. It is used to acquire the damage value of the engine bearing based on the vibration durability test of the engine cylinder under different acceleration conditions, the number of vibrations corresponding to the oil film between the crankshaft and the bearing reaching an unacceptable wear thickness value, and the periodically acquired vibration amplitude of the engine cylinder under normal driving conditions of the hybrid vehicle.

[0035] The wear compensation module is communicatively connected to the damage value acquisition module and is used to control the execution of different wear control strategies based on the acquired engine bearing damage values.

[0036] According to the second aspect, in a first possible implementation of the second aspect, the vibration test data acquisition module includes:

[0037] The time curve acquisition submodule is used to control the hybrid vehicle to drive in pure electric mode on various road surfaces in the road test track according to the powertrain vehicle durability standard, and acquire the time curve of cylinder block vibration acceleration near the engine bearing housing.

[0038] The distribution map acquisition submodule is communicatively connected to the time curve acquisition submodule. It is used to calculate the vibration amplitude of the time curve of the cylinder vibration acceleration near the engine bearing housing and to obtain the vibration amplitude and vibration frequency distribution map of the cylinder near the engine bearing housing.

[0039] The maximum vibration frequency acquisition submodule is communicatively connected to the distribution map acquisition submodule and is used to acquire the maximum vibration frequency corresponding to each vibration amplitude of the cylinder near the engine bearing housing based on the acquired vibration amplitude and vibration frequency distribution map of the cylinder near the engine bearing housing.

[0040] According to the second aspect, in a second possible implementation of the second aspect, the vibration durability test data acquisition module specifically includes the following steps:

[0041] The thickness value acquisition submodule is used to acquire engine bearing wear test data, which includes the thickness value of the oil film between the engine crankshaft and the bearing where unacceptable wear occurs;

[0042] The vibration durability test data acquisition submodule is communicatively connected to the thickness value acquisition submodule. It is used to acquire the number of engine cylinder vibrations corresponding to the thickness value of the oil film between the crankshaft and bearings reaching unacceptable wear when the engine assembly is subjected to vibration durability test under different acceleration conditions, based on the maximum vibration frequency corresponding to each vibration amplitude of the hybrid vehicle engine cylinder block and the thickness value of the oil film between the crankshaft and bearings where unacceptable wear occurs.

[0043] Compared with the prior art, the advantages of the present invention are as follows:

[0044] The series-parallel hybrid vehicle engine bearing wear prevention control method provided in this application obtains the cylinder block vibration number near the engine bearing housing under different acceleration conditions by obtaining the thickness value of the oil film between the crankshaft and bearing where irreversible wear occurs through engine durability vibration test. Based on the engine durability vibration test data and the vibration data of the hybrid vehicle during normal driving, the damage value of the engine bearing is obtained. According to the obtained damage value, different wear prevention control strategies are implemented to effectively avoid the bearing wear problem caused by excessive consumption of oil film between the crankshaft and bearing. Attached Figure Description

[0045] Figure 1 This is a flowchart of the method for controlling wear prevention of bearings in a series-parallel hybrid vehicle engine provided in an embodiment of the present invention;

[0046] Figure 2 This is a time curve of cylinder block vibration acceleration near the engine bearing housing obtained from a road test of a hybrid vehicle in pure electric mode, provided by an embodiment of the present invention.

[0047] Figure 3 The vibration amplitude and vibration frequency distribution diagrams provided in the embodiments of this application;

[0048] Figure 4 The curves of different accelerations and engine block vibration cycles provided for the vibration durability test of the engine assembly in this application embodiment;

[0049] Figure 5 This is a functional block diagram of the series-parallel hybrid vehicle engine bearing anti-model control system provided in an embodiment of this application. Detailed Implementation

[0050] Referring now to specific embodiments of the invention, examples of which are illustrated in the accompanying drawings. Although the invention will be described in conjunction with specific embodiments, it will be understood that it is not intended to limit the invention to the described embodiments. Rather, it is intended to cover variations, modifications, and equivalents included within the spirit and scope of the invention as defined by the appended claims. It should be noted that the method steps described herein can be implemented by any functional block or functional arrangement, and any functional block or functional arrangement can be implemented as a physical entity or a logical entity, or a combination of both.

[0051] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] Note: The examples described below are merely specific examples and are not intended to limit the embodiments of the present invention to the specific steps, values, conditions, data, order, etc. Those skilled in the art can utilize the concept of the present invention to construct more embodiments not mentioned herein by reading this specification.

[0053] Range-extended or plug-in hybrid electric vehicles (HEVs) typically operate in a situation where the engine is not running while the vehicle is in motion due to the large battery capacity. In this situation, there is a lack of oil supply compensation between the crankshaft and bearings, which can easily lead to excessive oil film consumption and bearing wear. This affects the service life of the bearings and increases the vehicle's maintenance costs.

[0054] In view of this, this application provides a method for preventing wear of engine bearings in series-parallel hybrid vehicles, in order to solve the technical problem that when the engine is not working, the lack of oil delivery compensation between the crankshaft and bearings leads to bearing wear.

[0055] Firstly, please refer to Figure 1 This application provides a method for preventing wear on bearings of a series-parallel hybrid vehicle engine, comprising the following steps:

[0056] Step S1: Obtain the maximum vibration frequency corresponding to each vibration amplitude of the hybrid vehicle engine cylinder block;

[0057] Step S2: Using the maximum vibration frequency corresponding to each vibration amplitude of the engine cylinder block obtained in Step S1 as a reference, conduct a vibration durability test on the engine assembly to obtain the number of cylinder block vibrations near the engine bearing housing when the oil film between the crankshaft and the bearing reaches an unacceptable wear thickness value under different acceleration conditions.

[0058] Step S3: During a single driving cycle between engine shutdown, electric motor operation and another vehicle driving condition, periodically acquire the engine cylinder vibration amplitude under normal driving conditions of the hybrid vehicle, wherein the other vehicle driving condition is engine operation and electric motor shutdown or engine operation and electric motor operation.

[0059] Step S4: Based on the vibration durability test conducted on the engine cylinder block under different acceleration conditions, the vibration number corresponding to the oil film between the crankshaft and bearing reaching the thickness value of unacceptable wear, and the periodically acquired vibration amplitude of the engine cylinder block under normal driving conditions of the hybrid vehicle, the damage value of the engine bearing is obtained.

[0060] Step S5: Based on the obtained engine bearing damage values, control and execute different wear control strategies.

[0061] The series-parallel hybrid vehicle engine bearing wear prevention control method provided in this application obtains the cylinder block vibration number near the engine bearing housing under different acceleration conditions by obtaining the thickness value of the oil film between the crankshaft and bearing where irreversible wear occurs through engine durability vibration test. Based on the engine durability vibration test data and the vibration data of the hybrid vehicle during normal driving, the damage value of the engine bearing is obtained. According to the obtained damage value, different wear prevention control strategies are implemented to effectively avoid the bearing wear problem caused by excessive consumption of oil film between the crankshaft and bearing.

[0062] In one embodiment, the step of obtaining the maximum vibration frequency corresponding to each vibration amplitude of the hybrid vehicle engine cylinder block specifically includes the following steps:

[0063] The hybrid vehicle was controlled to drive in pure electric mode on various road surfaces in a road test track according to the powertrain vehicle durability standard, and the time curves of cylinder block vibration acceleration near the engine bearing housing were obtained. Figure 2 As shown, the horizontal axis represents time, and the vertical axis represents the vibration amplitude;

[0064] The vibration amplitude of the cylinder block vibration acceleration time curve near the engine bearing housing is calculated to obtain the vibration amplitude and frequency distribution map of the cylinder block near the engine bearing housing, as shown below. Figure 3 As shown;

[0065] Based on the obtained vibration amplitude and frequency distribution diagram of the cylinder block near the engine bearing housing, the maximum vibration frequency corresponding to each vibration amplitude of the cylinder block near the engine bearing housing is obtained.

[0066] In one embodiment, the step of conducting a vibration durability test on the engine assembly based on the maximum vibration frequency corresponding to each vibration amplitude, and obtaining the number of cylinder block vibrations near the engine bearing housing when the oil film between the crankshaft and bearing reaches an unacceptable wear thickness value under different acceleration conditions, specifically includes the following steps:

[0067] Obtain engine bearing wear test data, which includes the thickness value of the oil film between the engine crankshaft and the bearing where unacceptable wear occurs. This test data comes from user data surveys and statistics.

[0068] Using the maximum vibration frequency corresponding to each vibration amplitude of the hybrid vehicle engine block as a reference, the engine assembly undergoes vibration durability testing on a vibration table. The thickness of the oil film between the engine crankshaft and bearings at which unacceptable wear occurs is obtained, along with the number of vibrations corresponding to the oil film thickness reaching this thickness under different acceleration conditions. By using the maximum vibration frequency corresponding to each vibration amplitude of the hybrid vehicle engine block as a reference, the vibration durability testing of the hybrid vehicle can be conducted within the maximum vibration frequency range of the engine block. Under this premise, the engine assembly is controlled to vibrate under different acceleration conditions, and the number of vibrations corresponding to the oil film thickness between the crankshaft and bearings reaching the unacceptable wear thickness is obtained. This number is then used as the maximum wear vibration count.

[0069] In one embodiment, the step of obtaining the damage value of the engine bearing based on the vibration durability test conducted on the engine block under different acceleration conditions, the vibration number corresponding to the oil film between the crankshaft and bearing reaching an unacceptable wear thickness value, and the periodically acquired vibration amplitude of the engine block under normal driving conditions of the hybrid vehicle, specifically includes the following steps:

[0070] Vibration durability tests were conducted on the engine block under different acceleration conditions. The number of vibrations corresponding to the point where the oil film between the crankshaft and bearings reached an unacceptable wear thickness was recorded, along with the periodic acquisition of the engine block vibration amplitude under normal driving conditions of the hybrid vehicle. Figure 4 As shown, the crankshaft damage value of the engine block in each time block under normal driving conditions of a hybrid vehicle is calculated according to the following formula:

[0071] S i =N 0.1i / N 0.1+N 0.2i / N 0.2 +……+N ni / N n ;

[0072] Specifically, during normal operation of the hybrid vehicle engine, when the engine is off and the electric motor is running, the vibration amplitude of the engine cylinder block is periodically acquired at data block length intervals. gi represents the vibration amplitude of the engine cylinder block in the i-th data block. Rainflow counting is performed on the vibration amplitude acquired in the i-th data block to obtain the distribution of vibration values ​​within the range of 0-ng at 0.1g intervals. Therefore, N 0.1i S represents the engine cylinder vibration amplitude at 0.1g acceleration corresponding to the i-th time data block under normal driving conditions of a hybrid vehicle. i is the engine oil film damage value corresponding to the i-th time data block, and n is the upper limit of the acceleration of the engine assembly under normal driving conditions;

[0073] Based on the crankshaft damage values ​​of the engine block in each time block under normal driving conditions of the hybrid vehicle, the total damage S of the engine bearings under normal driving conditions of the hybrid vehicle is obtained:

[0074] S = S1 + S2 + ... + S i ;

[0075] S i This represents the engine oil film damage value corresponding to the i-th time data block.

[0076] In one embodiment, the step of controlling the execution of different wear control strategies based on the acquired engine bearing damage values ​​specifically includes the following steps:

[0077] When the engine is running and the electric motor is stopped, if the engine cylinder block crankshaft damage value reaches 1, the control will compensate for the oil supply between the crankshaft and the bearing.

[0078] In one embodiment, the step of controlling the oil supply compensation between the crankshaft and the bearing specifically includes the following steps:

[0079] By controlling the generator to reverse-drive the crankshaft, the oil pump is driven to compensate for the oil supply between the crankshaft and the bearing, ensuring sufficient lubrication between the crankshaft and the bearing, and avoiding bearing wear caused by excessive oil film consumption.

[0080] In one embodiment, after the step of controlling the execution of different wear control strategies based on the acquired engine bearing damage value, the method further includes the following steps:

[0081] When the engine is running and the electric motor is stopped, if the engine cylinder block crankshaft damage value is less than 1, and the engine is driven for other reasons, the engine bearing damage value needs to be set to 0. The engine bearing damage value will be recalculated when the triggering condition is met again, i.e. when the engine stops and the electric motor runs during normal driving of the hybrid vehicle.

[0082] Secondly, based on the same inventive concept, please refer to... Figure 5 This application provides a series-parallel hybrid vehicle engine bearing anti-wear control system, characterized by comprising a vibration test data acquisition module 100, a vibration durability test data acquisition module 200, an engine cylinder block vibration data acquisition module 300, a loss value acquisition module 400, and a wear compensation module 500. The vibration test data acquisition module 100 is used to acquire the maximum vibration frequency corresponding to each vibration amplitude of the hybrid vehicle engine cylinder block. The vibration durability test data acquisition module 200 is communicatively connected to the vibration test data acquisition module 100 and is used to conduct vibration durability tests on the engine assembly with reference to the maximum vibration frequency corresponding to each vibration amplitude. The test obtains the cylinder block near the engine bearing housing when the oil film between the crankshaft and bearing reaches an unacceptable wear thickness value under different acceleration conditions. The vibration count; the engine block vibration data acquisition module 300 is used to periodically acquire the engine block vibration amplitude under normal driving conditions of the hybrid vehicle, triggered by engine shutdown and electric motor operation; the loss value acquisition module 400 is communicatively connected to the vibration durability test data acquisition module and the engine block vibration data acquisition module, and is used to acquire the engine bearing damage value based on the vibration durability test performed on the engine block under different acceleration conditions, the vibration count corresponding to the oil film between the crankshaft and bearing reaching an unacceptable wear thickness value, and the periodically acquired engine block vibration amplitude under normal driving conditions of the hybrid vehicle; the wear compensation module 500 is communicatively connected to the damage value acquisition module, and is used to control the execution of different wear control strategies based on the acquired engine bearing damage value.

[0083] In one embodiment, the vibration test data acquisition module includes a time curve acquisition submodule, a distribution map acquisition submodule, and a maximum vibration frequency acquisition submodule. The time curve acquisition submodule is used to control the hybrid vehicle to drive on various road surfaces in a road test track in pure electric mode according to the powertrain vehicle durability standard, and acquire the time curve of the cylinder block vibration acceleration near the engine bearing housing. The distribution map acquisition submodule is communicatively connected to the time curve acquisition submodule and is used to calculate the vibration amplitude of the acquired time curve of the cylinder block vibration acceleration near the engine bearing housing, and acquire the vibration amplitude and vibration frequency distribution map of the cylinder block near the engine bearing housing. The maximum vibration frequency acquisition submodule is communicatively connected to the distribution map acquisition submodule and is used to acquire the maximum vibration frequency corresponding to each vibration amplitude of the cylinder block near the engine bearing housing based on the acquired vibration amplitude and vibration frequency distribution map of the cylinder block near the engine bearing housing.

[0084] In one embodiment, the vibration durability test data acquisition module specifically includes the following steps: a thickness value acquisition submodule and a vibration durability test data acquisition submodule. The thickness value acquisition submodule is used to acquire engine bearing wear test data, which includes the thickness value of the oil film between the engine crankshaft and the bearing where unacceptable wear occurs. The vibration durability test data acquisition submodule is communicatively connected to the thickness value acquisition submodule and is used to acquire, based on the maximum vibration frequency corresponding to each vibration amplitude of the hybrid vehicle engine cylinder block and the thickness value of the oil film between the engine crankshaft and the bearing where unacceptable wear occurs, the number of engine cylinder block vibrations corresponding to the thickness value of the oil film between the crankshaft and the bearing reaching unacceptable wear during vibration durability testing of the engine assembly under different acceleration conditions.

[0085] Based on the same inventive concept, embodiments of this application also provide a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements all or part of the method steps of the above method.

[0086] The present invention can implement all or part of the processes in the above methods, or it can be accomplished by a computer program instructing related hardware. 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 file, or some intermediate form. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, 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.

[0087] Based on the same inventive concept, embodiments of this application also provide an electronic device, including a memory and a processor. The memory stores a computer program that runs on the processor. When the processor executes the computer program, it implements all or part of the method steps described above.

[0088] The processor can be a Central Processing Unit (CPU), or 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. A general-purpose processor can be a microprocessor or any conventional processor. The processor is the control center of the computer device, connecting all parts of the computer device through various interfaces and lines.

[0089] Memory can be used to store computer programs and / or modules. The processor performs various functions of the computer device by running or executing the computer programs and / or modules stored in the memory, and by accessing data stored in the memory. Memory can primarily include a program storage area and a data storage area. The program storage area can store the operating system and at least one application program required for a function (e.g., sound playback, image playback, etc.); the data storage area can store data created based on the use of the mobile phone (e.g., audio data, video data, etc.). Furthermore, memory can include high-speed random access memory, and can also include non-volatile memory, such as hard disks, RAM, plug-in hard disks, SmartMedia Cards (SMC), Secure Digital (SD) cards, Flash Cards, at least one disk storage device, flash memory device, or other volatile solid-state storage devices.

[0090] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, servers, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0091] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), servers, and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0092] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0093] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0094] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for controlling the wear of a bearing bush of a series-parallel hybrid vehicle engine, characterized by, The method comprises the following steps: Obtaining the maximum vibration frequency corresponding to each vibration amplitude of the engine block of the hybrid vehicle; Referring to the maximum vibration frequency corresponding to each vibration amplitude, performing a vibration durability test on the engine assembly to obtain the engine block vibration frequency corresponding to the thickness value of the unacceptable wear of the oil film between the crankshaft and the bearing bush when the engine assembly is in different acceleration conditions; Periodically obtaining the engine block vibration amplitude of the hybrid vehicle in the normal driving condition as the trigger condition of engine shutdown and motor operation; According to the vibration durability test of the engine block in different acceleration conditions, the vibration frequency corresponding to the thickness value of the unacceptable wear of the oil film between the crankshaft and the bearing bush, and the periodically obtained engine block vibration amplitude of the hybrid vehicle in the normal driving condition, the damage value of the engine bearing bush is obtained; According to the obtained damage value of the engine bearing bush, different wear control strategies are controlled to be executed; The step of controlling to execute different wear control strategies according to the obtained damage value of the engine bearing bush specifically comprises the following steps: When the engine is running and the motor is stopped, the damage value of the engine bearing bush reaches 1, and the oil supply compensation between the crankshaft and the bearing bush is controlled.

2. The anti-wear control method of a series-parallel hybrid vehicle engine bearing as claimed in claim 1, characterized by, The step of obtaining the maximum vibration frequency corresponding to each vibration amplitude of the engine block of the hybrid vehicle specifically comprises the following steps: Controlling the hybrid vehicle to drive in various road surfaces in the road test field according to the powertrain vehicle durability standard in the form of pure electric driving to obtain the time curve of the engine block vibration acceleration; The rainflow counting method is used to calculate the vibration amplitude of the obtained time curve of the engine block vibration acceleration to obtain the engine block vibration amplitude and vibration frequency distribution diagram; According to the obtained engine block vibration amplitude and vibration frequency distribution diagram, the vibration frequency corresponding to each vibration amplitude of the engine block is obtained.

3. The anti-wear control method of a series-parallel hybrid vehicle engine bearing according to claim 1, characterized by, The step of referring to the maximum vibration frequency corresponding to each vibration amplitude, performing a vibration durability test on the engine assembly to obtain the engine block vibration frequency corresponding to the thickness value of the unacceptable wear of the oil film between the crankshaft and the bearing bush when the engine assembly is in different acceleration conditions specifically comprises the following steps: Obtaining the engine bearing bush wear test data, the engine bearing bush wear test data including the thickness value of the unacceptable wear of the oil film between the engine crankshaft and the bearing bush; According to the obtained maximum vibration frequency corresponding to each vibration amplitude of the engine block of the hybrid vehicle and the thickness value of the unacceptable wear of the oil film between the engine crankshaft and the bearing bush, the engine block vibration frequency corresponding to the thickness value of the unacceptable wear of the oil film between the crankshaft and the bearing bush when the engine assembly is in different acceleration conditions is obtained.

4. The anti-wear control method of a series-parallel hybrid vehicle engine bearing according to claim 1, characterized by, The step of obtaining the damage value of the engine bearing bush according to the vibration durability test of the engine block in different acceleration conditions, the vibration frequency corresponding to the thickness value of the unacceptable wear of the oil film between the crankshaft and the bearing bush, and the periodically obtained engine block vibration amplitude of the hybrid vehicle in the normal driving condition specifically comprises the following steps: The engine cylinder is subjected to vibration durability test under different acceleration conditions, and the corresponding vibration frequency when the oil film between the crankshaft and the bearing bush reaches an unacceptable thickness value of wear and tear and the periodically obtained vibration amplitude of the engine cylinder under normal driving conditions of the hybrid vehicle are used to calculate the crankshaft damage value of the engine cylinder in each time block under normal driving conditions of the hybrid vehicle: S i =N 0.1i / N 0.1 +N 0.2i / N 0.2 +……+N ni / N n ; wherein N 0.1i is the engine block vibration amplitude under 0.1g acceleration corresponding to the i-th time data block, S i is the engine oil film damage value corresponding to the i-th time data block, and n is the upper limit value of the acceleration of the engine assembly under normal driving conditions. According to the obtained crankshaft damage value of the engine cylinder in each time block under the driving condition that the motor works and the engine stops, the total damage S of the engine bearing bush under normal driving conditions of the hybrid vehicle is obtained: S = S1 + S2 +... S i .

5. The anti-wear control method of a series-parallel hybrid vehicle engine bearing according to claim 1, characterized by, The step of controlling the oil supply compensation between the crankshaft and the bearing bush specifically includes the following steps: By controlling the generator to drag the crankshaft, the oil pump is used to supply oil to compensate between the crankshaft and the bearing bush.

6. The anti-wear control method of a series-parallel hybrid vehicle engine bearing as claimed in claim 1, wherein, After the step of controlling the execution of different wear control strategies according to the obtained engine bearing bush damage value, the following steps are further included: When the engine is running and the motor is stopped, and the engine cylinder crankshaft damage value is less than 1, the engine bearing bush damage value is set to 0.

7. A kind of series-parallel hybrid vehicle engine bearing bush wear-preventing control system, it is characterized in that, It includes: A vibration test data acquisition module is used to obtain the maximum vibration frequency corresponding to each vibration amplitude of the engine cylinder of the hybrid vehicle; The vibration durability test data acquisition module is in communication connection with the vibration test data acquisition module, and is used to refer to the maximum vibration frequency corresponding to each vibration amplitude, to carry out vibration durability test on the engine assembly, to obtain the corresponding engine cylinder vibration frequency when the oil film between the crankshaft and the bearing bush reaches an unacceptable thickness value of wear and tear under different acceleration conditions of the engine assembly; An engine cylinder vibration data acquisition module is used to periodically obtain the vibration amplitude of the engine cylinder under normal driving conditions of the hybrid vehicle with the engine stopped and the motor running as a trigger condition; A damage value acquisition module is in communication connection with the vibration durability test data acquisition module and the engine cylinder vibration data acquisition module, and is used to obtain the damage value of the engine bearing bush according to the vibration frequency when the oil film between the crankshaft and the bearing bush reaches an unacceptable thickness value of wear and tear under different acceleration conditions of the engine cylinder subjected to vibration durability test, and the periodically obtained vibration amplitude of the engine cylinder under normal driving conditions of the hybrid vehicle; A wear compensation module is in communication connection with the damage value acquisition module, and is used to control the execution of different wear control strategies according to the obtained damage value of the engine bearing bush.

8. The anti-wear control system for the series-parallel hybrid vehicle engine bearing according to claim 7, characterized in that, The vibration test data acquisition module includes: A time curve acquisition submodule is used to control the hybrid vehicle to drive on various roads in the road test field according to the powertrain vehicle durability standard in the form of pure electric driving, and to obtain the time curve of the engine cylinder vibration acceleration; A distribution diagram acquisition submodule is in communication connection with the time curve acquisition submodule, and is used to calculate the vibration amplitude of the obtained time curve of the engine cylinder vibration acceleration, to obtain the vibration amplitude and frequency distribution diagram of the engine cylinder; A maximum vibration frequency acquisition submodule is in communication connection with the distribution diagram acquisition submodule, and is used to obtain the maximum vibration frequency corresponding to each vibration amplitude of the engine cylinder according to the obtained vibration amplitude and frequency distribution diagram of the engine cylinder.

9. The anti-wear control system for the series-parallel hybrid vehicle engine bearing according to claim 7, characterized in that, The vibration endurance test data acquisition module specifically includes the following steps: The thickness value acquisition submodule is used for acquiring engine bearing bush wear test data, and the engine bearing bush wear test data of the engine includes a thickness value at which an unacceptable wear of an oil film between an engine crankshaft and a bearing bush occurs; The vibration endurance test data acquisition submodule is in communication connection with the thickness value acquisition submodule and is used for acquiring, according to the maximum vibration frequency corresponding to each vibration amplitude of the engine cylinder block and the thickness value at which the unacceptable wear of the oil film between the engine crankshaft and the bearing bush occurs, the vibration frequency of the engine cylinder block corresponding to the thickness value at which the unacceptable wear of the oil film between the crankshaft and the bearing bush occurs when the engine assembly is subjected to vibration endurance test under different acceleration conditions.

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