Method for obtaining transmission gear shifting line based on in-vehicle vibration

Abstract

The invention discloses a method for obtaining a transmission gear shifting line based on in-vehicle vibration, and belongs to the technical field of automobiles, and the method comprises the following steps: step 1, obtaining gear shifting data of an existing product sample vehicle with vibration, and fitting based on the gear shifting data of the product sample vehicle to obtain a gear shifting line graph; 2, a product sample vehicle is fixed to the rotating hub drum face of the four-wheel-drive rotating hub semi-anechoic chamber, the drum face can simulate the smooth road test requirement, a rotating hub chassis dynamometer test bed is adjusted to a hub belt vehicle, and a fixed accelerator is adopted; step 3, arranging vibration test points; 4, setting a test working condition; 5, testing, recording vibration signals in the vehicle, carrying out subjective evaluation, and recording scores; and 6, formulating a vibration objective test target, and making different marks on the gear shifting line according to an objective test result and the subjective evaluation score to obtain the gear shifting line under different gears of the transmission. According to the method, on the basis of a transmission gear shifting line, in-vehicle vibration caused by improper transmission gear shifting line is recognized by combining subjective evaluation and objective test data; and in combination with the project balance economy, the gear shifting moment of the transmission and the vibration in the vehicle are relatively balanced.

Description

Technical Field

[0001] The invention belongs to the technical field of automobiles, and in particular relates to a method for obtaining a transmission shift line based on in-vehicle vibration. Background Art

[0002] At present, four-wheel drive passenger cars have become a high-end market segment where OEMs are competing fiercely. Vibration and in-car roar are prominent NVH problems of such models, and controlling vibration of four-wheel drive vehicles has become a key core technology for most OEMs. The main frequency of in-car vibration is in the range of 20Hz to 80Hz. The factors that cause in-car vibration of four-wheel drive or rear-wheel drive passenger cars are complex, and the main factors are:

[0003] The first-order vibration of the transmission system caused by excessive residual imbalance of the transmission system, the second-order vibration of the transmission system caused by the unequal speed cross-bit, the main-order vibration of the engine caused by the resonance between the engine and other structures due to the unreasonable design of the exhaust system, the vibration inside the car caused by the rotation of the tires, the vibration caused by the torsional resonance of the transmission system, the vibration inside the car caused by the road excitation, etc. The vibration inside the car causes the body of the driver and passengers in this environment to shake, which seriously affects the driving experience of the driver and passengers.

[0004] There have been many studies on the causes of vibration at home and abroad. For automotive product development engineers, the most basic way to solve the vibration is to identify the problem that causes the vibration. The following methods can be used:

[0005] Identify the cause of vibration by combining vehicle ODS testing with system modal analysis;

[0006] Identify and optimize vibrations by combining powertrain torsional vibration testing with multi-body dynamics to establish a powertrain torsional vibration model;

[0007] The cause of vibration was identified by testing the whole vehicle and analyzing the vibration mechanism. The vibration problem was solved by adding a dynamic vibration absorber to the transmission shaft.

[0008] By establishing a lumped parameter model and a transmission system finite element model, and matching the tuned shock absorber through calculation and analysis using existing commercial software, the vibration caused by the torsional vibration of the vehicle's transmission system was identified and resolved. Summary of the invention

[0009] In view of the problems existing in the prior art that, in the process of setting a transmission shift line, only drivability, smoothness and power are considered, and the impact of the shifting moment on the NVH performance of the whole vehicle is basically not considered; the present invention provides a method for obtaining a transmission shift line based on in-vehicle vibration, which relies on the transmission shift line and combines subjective evaluation and objective test data to identify in-vehicle vibration caused by an inappropriate transmission shift line; combined with the project balance economy, a relative balance is achieved between the transmission shifting moment and the in-vehicle vibration.

[0010] The present invention is achieved through the following technical solutions:

[0011] A method for obtaining a transmission shift line based on in-vehicle vibration specifically comprises the following steps:

[0012] Step 1: obtaining the gear shifting data of an existing product sample vehicle with vibration, and fitting a gear shifting line diagram based on the gear shifting data of the product sample vehicle;

[0013] Step 2: Fix the product sample car to the drum surface of the four-wheel drive hub semi-anechoic chamber. The drum surface can simulate the smooth road test requirements. Adjust the hub chassis dynamometer test bench to the hub belt car and use a fixed throttle.

[0014] Step 3: Arrange vibration test points;

[0015] Step 4: Set up the test conditions;

[0016] Step 5: Conduct the test, record the vibration signal inside the vehicle, make a subjective evaluation and record the score;

[0017] Step 6: Establish objective vibration test targets, make different marks on the shift line according to the objective test results and subjective evaluation scores, and obtain the shift lines under different gear positions of the transmission.

[0018] Furthermore, in step one, the gear shifting data of the product sample vehicle is obtained from existing data of a calibration department, and the horizontal axis of the gear line diagram is the vehicle speed, and the vertical axis is the throttle opening.

[0019] Furthermore, in step three, the vibration measuring points of rear-wheel drive or four-wheel drive vehicles are arranged on the rear axle side of the connection position between the rear axle housing and the drive shaft, the passive side of the intermediate support of the drive shaft, and the transmission side of the connection position between the drive shaft and the transmission; and the vibration measuring points of front-wheel drive vehicles are arranged on the driver's seat rail.

[0020] Furthermore, in step 4, the test conditions are as follows:

[0021] Chassis dynamometer control mode: the rotating hub drives the prototype vehicle;

[0022] Transmission gear: the transmission gear where the vibration in the car occurs;

[0023] Throttle opening: fixed throttle opening, throttle opening from 0% to 100%;

[0024] Engine speed: At each fixed throttle opening, the engine speed increases from the lowest stable engine speed in the current gear to 2500r / min or the engine speed corresponding to a vehicle speed of 120km / h within 60±5 seconds, whichever is smaller.

[0025] Furthermore, when the throttle opening is below 40%, each interval of 5% is a test condition, and when the throttle opening is above 40%, each interval of 10% is a test condition.

[0026] Furthermore, in step six, if there is a difference between the subjective evaluation result and the objective test result, multiple people conduct subjective evaluation multiple times to correct the subjective evaluation result.

[0027] In a second aspect, the present invention further provides a computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, a method for obtaining a transmission shift line based on in-vehicle vibration as described in any one of the embodiments of the present invention is implemented.

[0028] In a third aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for obtaining a transmission shift line based on in-vehicle vibration as described in any one of the embodiments of the present invention.

[0029] Compared with the prior art, the advantages of the present invention are as follows:

[0030] The method of the present invention for obtaining a transmission shift line based on in-vehicle vibration can rely on the subjective perception of the driver and passengers and combine with objective test data, and adopts a mode of rotating hub with the vehicle to fix the engine throttle opening. It can identify whether the vehicle has obvious vibration under different gears, different throttle openings and different vehicle speeds, and rely on the existing shift line to identify the vibration area, providing a reference for continuing to optimize calibration and solve the transmission vibration problem during product development. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0032] Figure 1 A schematic flow chart of a method for obtaining a transmission shift line based on in-vehicle vibration according to the present invention;

[0033] Figure 2This is a schematic diagram of a car shifting from 6th gear to 7th gear and from 6th gear to 5th gear;

[0034] Figure 3 This is a schematic diagram of the location of the vibration sensor;

[0035] Figure 4 This is a schematic diagram of the seat rail sensor;

[0036] Figure 5 This is a schematic diagram of fixed throttle opening in hub-driven mode;

[0037] Figure 6 Schematic diagram of the shift line after measuring the vibration hub of a certain car's transmission;

[0038] Figure 7 This is a schematic diagram of the in-vehicle vibration overll reference curve;

[0039] Among them, the horizontal axis is the engine speed, and the vertical axis is the vibration acceleration;

[0040] Figure 8 This is a schematic diagram of the structure of a computer device in Example 2 of the present invention. DETAILED DESCRIPTION

[0041] In order to clearly and completely describe the technical solution and its specific working process of the present invention, the specific implementation methods of the present invention are as follows in conjunction with the accompanying drawings of the specification:

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0045] Example 1

[0046] like Figure 1 FIG. 1 is a flow chart of a method for obtaining a transmission shift line based on in-vehicle vibration according to an embodiment of the present invention. The method specifically includes the following steps:

[0047] Step 1: obtaining the gear shifting data of an existing product sample vehicle with vibration, and fitting a gear shifting line diagram based on the gear shifting data of the product sample vehicle;

[0048] The gear shift data of the product prototype vehicle is obtained from the calibration department. The horizontal axis of the gear line diagram is the vehicle speed, and the vertical axis is the throttle opening. Figure 2 As shown;

[0049] Step 2: Fix the product sample car to the drum surface of the four-wheel drive hub semi-anechoic chamber. The drum surface can simulate the smooth road test requirements. Adjust the hub chassis dynamometer test bench to the hub belt car and use a fixed throttle.

[0050] Step 3: Arrange vibration test points;

[0051] The vibration measurement points for rear-wheel drive or four-wheel drive vehicles are arranged on the rear axle side of the connection between the rear axle housing and the transmission shaft, the passive side of the intermediate support of the transmission shaft, and the transmission side of the connection between the transmission shaft and the transmission. For front-wheel drive vehicles, the measurement points are arranged on the driver's seat rail, such as Figure 3 and Figure 4 As shown;

[0052] Step 4: Set up the test conditions;

[0053] The test conditions are as follows:

[0054] Chassis dynamometer control mode: the rotating hub drives the prototype vehicle;

[0055] Transmission gear: the transmission gear where the vibration in the car occurs;

[0056] Throttle opening: fixed throttle opening, throttle opening from 0% to 100%;

[0057] Engine speed: At each fixed throttle opening, the engine speed increases from the lowest stable engine speed in the current gear to 2500r / min or the engine speed corresponding to a vehicle speed of 120km / h within 60±5 seconds, whichever is smaller.

[0058] When the throttle opening is below 40%, each 5% interval is a test condition; when the throttle opening is above 40%, each 10% interval is a test condition;

[0059] The engine speed changes over time Figure 5 As shown, the throttle opening test range can be refined according to actual conditions. The vibration signal, the driver's seat rail vibration signal, and the engine speed signal are recorded under each throttle opening condition.

[0060] Step 5: Conduct the test and record the vibration signal inside the vehicle. The test conditions are shown in Table 1. Conduct subjective evaluation and record the score.

[0061] Table 1 Controlling fixed throttle opening

[0062]

[0063] Step 6: Establish objective vibration test targets, make different marks on the shift line according to the objective test results and subjective evaluation scores, and obtain the shift lines under different gear positions of the transmission.

[0064] If there is a difference between the subjective evaluation results and the objective test results, multiple people will conduct subjective evaluations multiple times to revise the subjective evaluation results. The subjective evaluation reference table is shown in Table 2.

[0065] Table 2 Subjective evaluation reference table

[0066] Points mark Objective test data ≤ 6 points × 6 points≤≤6.5 points △ ≥7 points ○

[0067] According to the recorded data, a reference shift line is formulated, such as Figure 6 As shown;

[0068] like Figure 7 As shown, the marked area below the 5-gear downshift line and below 6 points indicates that there is obvious vibration, which is unacceptable and the shift line needs to be adjusted to above 6 points.

[0069] Example 2

[0070] Figure 8 This is a schematic diagram of the structure of a computer device in Example 2 of the present invention. Figure 8 A block diagram of an exemplary computer device 12 suitable for use in implementing embodiments of the present invention is shown. Figure 8 The computer device 12 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0071] like Figure 8 As shown, the computer device 12 is in the form of a general-purpose computing device. The components of the computer device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, and a bus 18 that connects various system components (including the system memory 28 and the processing unit 16).

[0072] Bus 18 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor or a local bus using any of a variety of bus architectures. By way of example, these architectures include, but are not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MAC) bus, an Enhanced ISA bus, a Video Electronics Standards Association (VESA) local bus, and a Peripheral Component Interconnect (PCI) bus.

[0073] The computer device 12 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by the computer device 12, including volatile and non-volatile media, removable and non-removable media.

[0074] The system memory 28 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 30 and / or cache memory 32. The computer device 12 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, the storage system 34 may be used to read and write non-removable, non-volatile magnetic media ( Figure 8 not shown, usually called a "hard drive"). Although Figure 8 Not shown in the figure, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk"), and an optical disk drive for reading and writing to a removable non-volatile optical disk (e.g., a CD-ROM, a DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to the bus 18 via one or more data medium interfaces. The memory 28 may include at least one program product having a set (e.g., at least one) of program modules that are configured to perform the functions of the various embodiments of the present invention.

[0075] A program / utility 40 having a set (at least one) of program modules 42 may be stored, for example, in the memory 28. Such program modules 42 include, but are not limited to, an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment. The program modules 42 generally perform the functions and / or methods of the embodiments described herein.

[0076] The computer device 12 may also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), may also communicate with one or more devices that enable a user to interact with the computer device 12, and / or communicate with any device that enables the computer device 12 to communicate with one or more other computing devices (e.g., network card, modem, etc.). Such communication may be performed through an input / output (I / O) interface 22. In addition, the computer device 12 in this embodiment, the display 24 does not exist as an independent individual, but is embedded in the mirror surface, and when the display surface of the display 24 is not displayed, the display surface of the display 24 and the mirror surface are visually integrated. In addition, the computer device 12 may also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN) and / or public network, such as the Internet) through a network adapter 20. As shown in the figure, the network adapter 20 communicates with other modules of the computer device 12 through a bus 18. It should be understood that although not shown in the figures, other hardware and / or software modules may be used in conjunction with the computer device 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0077] The processing unit 16 executes various functional applications and data processing by running programs stored in the system memory 28, such as implementing a method for identifying the relationship between in-vehicle vibration and transmission shift lines based on a chassis dynamometer provided in an embodiment of the present invention.

[0078] Example 3

[0079] Embodiment 3 of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, a method for identifying the relationship between in-vehicle vibration and transmission shift line based on a chassis dynamometer as provided in all the embodiments of the present application is implemented.

[0080] Any combination of one or more computer-readable media may be used. A computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in conjunction with an instruction execution system, device, or device.

[0081] Computer-readable signal media may include a data signal propagated in baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take a variety of forms, including, but not limited to, electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0082] Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0083] Computer program code for performing the operations of the present invention may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may 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 may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0084] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for obtaining a transmission shift line based on in-vehicle vibration, characterized in that: The specific steps include: Step 1: obtaining the gear shifting data of an existing product sample vehicle with vibration, and fitting a gear shifting line diagram based on the gear shifting data of the product sample vehicle; Step 2: Fix the product sample car to the drum surface of the four-wheel drive hub semi-anechoic chamber. The drum surface can simulate the smooth road test requirements. Adjust the hub chassis dynamometer test bench to the hub belt car and use a fixed throttle. Step 3: Arrange vibration test points; Step 4: Set up the test conditions; Step 5: Conduct the test, record the vibration signal inside the vehicle, make a subjective evaluation and record the score; Step 6: Establish objective vibration test targets, make different marks on the shift line according to the objective test results and subjective evaluation scores, and obtain the shift lines under different gear positions of the transmission.

2. The method for obtaining a transmission shift line based on in-vehicle vibration according to claim 1, characterized in that: In step 1, the gear shifting data of the product sample vehicle is obtained from the calibration department, and the horizontal axis of the gear line diagram is the vehicle speed, and the vertical axis is the throttle opening.

3. The method for obtaining a transmission shift line based on in-vehicle vibration according to claim 1, characterized in that: In step three, the vibration measurement points for rear-wheel drive or four-wheel drive vehicles are arranged on the rear axle side of the connection between the rear axle housing and the drive shaft, the passive side of the intermediate support of the drive shaft, and the transmission side of the connection between the drive shaft and the transmission; for front-wheel drive vehicles, they are arranged on the driver's seat rail.

4. The method for obtaining a transmission shift line based on in-vehicle vibration according to claim 1, characterized in that: In step 4, the test conditions are as follows: Chassis dynamometer control mode: the rotating hub drives the prototype vehicle; Transmission gear: the transmission gear where the vibration in the car occurs; Throttle opening: fixed throttle opening, throttle opening from 0% to 100%; Engine speed: At each fixed throttle opening, the engine speed increases from the lowest stable engine speed in the current gear to 2500r / min or the engine speed corresponding to a vehicle speed of 120km / h within 60±5 seconds, whichever is smaller.

5. The method for obtaining a transmission shift line based on in-vehicle vibration according to claim 4, characterized in that: When the throttle opening is below 40%, each 5% interval is a test condition; when the throttle opening is above 40%, each 10% interval is a test condition.

6. The method for obtaining a transmission shift line based on in-vehicle vibration according to claim 1, characterized in that: In step six, if there is a difference between the subjective evaluation result and the objective test result, multiple people conduct subjective evaluation multiple times to correct the subjective evaluation result.

7. A computer device, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the program, a method for obtaining a transmission shift line based on in-vehicle vibration as described in any one of claims 1 to 6 is implemented.

8. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the program is executed by a processor, a method for obtaining a transmission shift line based on in-vehicle vibration as described in any one of claims 1 to 6 is implemented.

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