A method, recording medium and system for quantifying in a laboratory the effect of clutch rust on shift force

Abstract

The present application belongs to the technical field of transmission control of automobile gearbox, and discloses a method for quantifying the influence of clutch corrosion on gear shifting force in a laboratory. The method simulates the continuous deterioration of the transmission system with the change of environment in the whole life cycle, and quantifies the influence of the deterioration degree on the gear shifting force, so that the cause of the change of the gear shifting force can be accurately revealed, and improvement can be targetedly proposed, which has guiding significance for the gear shifting force performance and reliability of the automobile. The present application also provides a non-transitory readable recording medium storing the program of the method and a system comprising the medium, and the program can be called by a processing circuit to execute the above method.

Description

Technical Field

[0001] This invention belongs to the field of automotive transmission control technology, and specifically discloses a method for quantifying the effect of clutch corrosion on shifting force in the laboratory, a recording medium and system storing the program of this method. Background Technology

[0002] To ensure driving safety, improve the driver's operating experience, and enhance driving pleasure, the power design of manual transmission cars often requires calculating shifting force and simulating and verifying it in the laboratory so that it can be optimized in the later design. Major manufacturers have analyzed the factors affecting the dynamic shifting performance of cars, including synchronizer capacity, transmission drag torque, transmission speed ratio, clutch driven plate and transmission constant mesh rotational inertia, which are basically consistent with the state of the whole new car.

[0003] However, these methods have two problems: 1) After the vehicle has been used, the shifting force will change (generally increasing gradually), and the above test plan cannot verify this.

[0004] During the use of a vehicle, the shifting force is not constant. As the vehicle ages, mileage increases, and the number of times it is operated increases, the reliability of the shifting-related components will deteriorate, leading to a gradual increase in shifting force until shifting becomes difficult.

[0005] 2) None of these schemes considered the impact of clutch disengagement performance, temperature, and reliability (deterioration of clutch splines due to corrosion, dust, wear, etc. during vehicle use) on the factors affecting shift performance verification.

[0006] During gear shifting, the clutch needs to be completely disengaged. However, complete disengagement is relative. In reality, there is always a certain frictional torque between the clutch driven plate and the flywheel and pressure plate. This frictional torque keeps the clutch driven plate rotating with the flywheel, contrary to the shifting requirement (the flywheel must disengage from the clutch driven plate). This torque needs to be overcome by the transmission synchronizer during shifting, resulting in a larger synchronization force. As the vehicle is used, the reliability of components changes (deteriorates). Among these changes, wear, corrosion, and dust accumulation on the spline working surface of the clutch cause the clutch driven plate to slide less smoothly on the transmission shaft. At this point, the torque required for the driven plate to disengage from the flywheel increases, resulting in increasingly greater shifting force until it becomes impossible to engage a gear. How to simulate the continuous deterioration of the transmission system throughout its entire lifespan due to environmental changes and quantify the impact of this deterioration on shifting force is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] This invention addresses the shortcomings of existing technologies by proposing a laboratory method for quantifying the impact of clutch corrosion on shifting force, comprising the following steps: A simulated power input and output load are set up in the laboratory, and a gearbox with a clutch is connected between them. The clutch is equipped with an operating pedal to control the engagement and disengagement, the gearbox is equipped with a shifting mechanism, a speed and torque measuring device is set on the output shaft of the motor, and a torque measuring device is set on the output shaft of the gearbox. Start the motor and apply different environmental influences to the clutch spline and gearbox input shaft spline to make them reach different corrosion levels. Perform shifting tests under different corrosion levels and measure the speed and torque of the motor output shaft and the torque of the gearbox output shaft. Substitute the measured values ​​obtained through the above steps into the shift force calculation formula to calculate the shift force of different gears under different corrosion levels of the clutch. Compare these values ​​with the corresponding values ​​of a non-corroded clutch to quantify the impact of clutch corrosion on shift force. The formula for calculating the shifting force is: in, I0 is the inertia of the entire vehicle transferred to the gearbox output shaft, in kg.m 2 Synchronizer active component speed, rad / s Synchronizer driven speed, rad / s t s Synchronization time, sec M Synchronizer Capacity, D Synchronizer diameter, m Synchronous ring cone angle, ° Synchronous ring friction coefficient N. Gearbox input shaft speed, rpm i t The gear ratio of the transmission after shifting, i t0 The gear ratio before shifting; T f Transmission input shaft drag torque, Nm T fc Clutch drag torque, Nm F represents the force exerted on the synchronizer sleeve, N represents the force exerted on the synchronizer sleeve. N is the input shaft speed, in rpm. P is the operating force at the handle end, N is the operating force at the handle end. i s Transmission ratio from the gear sleeve to the handle end Transmission efficiency from the gear sleeve to the handle end.

[0008] Preferably, the simulated power input terminal is a motor with a flywheel, wherein the flywheel is connected to the clutch, and the simulated output terminal load is a tail-end flywheel with the same moment of inertia as the rated load, wherein the tail-end flywheel is connected to the output shaft of the gearbox to obtain power.

[0009] Another aspect of the present invention is to provide a non-transient readable recording medium for storing one or more programs containing multiple instructions, which, when executed, cause the processing circuit to perform the above-described method for quantifying the effect of clutch corrosion on shifting force in a laboratory setting.

[0010] Another aspect of the present invention provides a system for quantifying the effect of clutch corrosion on shifting force in a laboratory setting, comprising a processing circuit and a memory electrically coupled thereto, the memory being configured to store at least one program containing multiple instructions, the processing circuit executing the program to perform the aforementioned method for quantifying the effect of clutch corrosion on shifting force in a laboratory setting. Compared with the prior art, the present invention has the following beneficial effects: This method can simulate the continuous deterioration of a transmission system throughout its entire life cycle due to environmental changes, and quantify the impact of this deterioration on shifting force. Therefore, it can accurately reveal the reasons for changes in shifting force and propose targeted improvements, which has guiding significance for the performance and reliability of automotive shifting force. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the measuring device used in the embodiments of the present invention; Figure 2 A schematic diagram of power transmission in a manual transmission vehicle. In the diagram, 1-drive motor; 2-speed / torque measuring instrument; 3-first inertia flywheel; 4-clutch driven plate; 5-clutch pressure plate assembly; 6-gearbox assembly; 7-first support bearing; 8-torque measuring instrument; 9-second support bearing; 10-second inertia flywheel; 11-third support bearing; 12-shift cable; 13-gear selection cable; 14-gear selection lever; 15-gear selection handle; 16-clutch slave cylinder assembly; 17-clutch oil hose; 18-clutch control master cylinder; 19-clutch control electric valve. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without innovative effort are within the scope of protection of the present invention.

[0013] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: refer to Figure 2 The transmission sequence shown is as follows: Figure 1 The test equipment is connected in the following manner: a speed / torque measuring instrument 2 is installed on the output shaft of the drive motor 1, which is connected to the first inertia flywheel 3 to replace the internal combustion engine output power; then it is connected to the gearbox assembly 6 through the clutch driven plate 4 and the clutch pressure plate assembly 5; the output shaft of the gearbox is supported by the first support bearing 7; the shaft end is connected to the torque measuring instrument 8 through the flange; the torque measuring instrument 8 is connected to the rotating shaft of the second inertia flywheel 10 through the flange; the two ends of the rotating shaft of the second inertia flywheel 10 are supported by the second support bearing 9 and the third support bearing 11, respectively; the gear shift lever 14 is connected to the synchronous gear ring of the corresponding gear through the gear shift cable 13 and the gear shift cable 12, respectively; the gear shift handle 15 is located at the free end of the gear shift lever 14 and is used to operate the gear shift; the clutch control electric valve 19 forces hydraulic oil through the clutch oil supply hose 17 into the clutch slave pump assembly 16 by changing the volume of the clutch control master cylinder 18, which pushes the clutch pressure plate assembly 5 to perform the corresponding clutch action.

[0014] At the start of the test, drive motor 1 was started, and different environmental influences were applied to the clutch spline and other components to bring them to different corrosion levels. Shifting tests were conducted under different corrosion levels, and the speed and torque of the output shaft of drive motor 1 and the torque of the output shaft of gearbox assembly 6 were measured. Substitute the above measured values ​​into the shift force calculation formula to calculate the shift force of different gears under different corrosion levels of the clutch. Compare these values ​​with the corresponding values ​​of a non-corroded clutch to quantify the impact of clutch corrosion on shift force.

[0015] The formula for calculating shift force is: in, I0 is the inertia of the entire vehicle transferred to the gearbox output shaft, in kg.m 2 Synchronizer active component speed, rad / s Synchronizer driven speed, rad / s t s Synchronization time, sec M Synchronizer Capacity, D Synchronizer diameter, m Synchronous ring cone angle, ° Synchronous ring friction coefficient N. Gearbox input shaft speed, rpm i t The gear ratio of the transmission after shifting, i t0 The gear ratio before shifting; T f Transmission input shaft drag torque, Nm T fc Clutch drag torque, Nm F represents the force exerted on the synchronizer sleeve, N represents the force exerted on the synchronizer sleeve. N is the input shaft speed, in rpm. P is the operating force at the handle end, N is the operating force at the handle end. i s Transmission ratio from the gear sleeve to the handle end Transmission efficiency from the gear sleeve to the handle end.

[0016] When the car is new, the clutch, transmission, and system components are in normal condition, and the clutch drag torque does not exceed 0.8 Nm / 1.4 mm. Taking 1st to 2nd gear as an example, the comparison data is as follows: The operating conditions are changed, and the transmission oil temperature and clutch operating environment temperature are controlled to simulate the deterioration state of the clutch after long-term use.

[0017] Transmission assembly 6. Oil temperature control: An oil temperature sensor is connected to the drain plug. During the test, the transmission oil temperature is controlled at 80℃±5℃ through external air cooling.

[0018] Operating environment control of clutch pressure plate 4 and clutch driven plate 5: Salt spray environment: Use a standard 1% sodium chloride L solution at a temperature of 23℃±2℃, spray from the top of the clutch pressure plate 5, spray pressure 100kpa±30kpa, and the spray is evenly distributed on the first flywheel 3, clutch pressure plate assembly 5, clutch driven plate 4 and gearbox assembly 6 by gravity. Control the spray to ensure that the relative humidity is maintained at 90%±3%. Cool the outside of the housing by blowing air, and control the flywheel temperature to not exceed 150℃.

[0019] Due to the effects of salt spray, the splines on the flywheel 3, the clutch driven plate 5, and the input shaft of the gearbox 5 all corroded, causing the clutch driven plate 5 to slide unevenly on the gearbox 6 shaft, resulting in a gradual increase in shifting force. The test data obtained after the environmental change caused clutch corrosion are shown in the table below: Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, 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 computers or available storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0020] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), 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 illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0021] 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.

[0022] 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.

[0023] Compiling the above methods and steps into a program and storing it on a hard disk or other non-transitory storage medium constitutes the technical solution of "a non-transitory readable recording medium" of the present invention; while electrically connecting the storage medium to a computer processor and completing the quantitative evaluation of the impact of clutch deterioration on shifting force through data processing constitutes the technical solution of "a laboratory system for quantifying the impact of clutch corrosion on shifting force" of the present invention.

[0024] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for quantifying the effect of corrosion on shifting force of clutch splines and gearbox input shaft splines in a laboratory setting, characterized in that... Includes the following steps: A simulated power input and output load are set up in the laboratory, and a gearbox with a clutch is connected between them. The clutch is equipped with an operating pedal to control the engagement and disengagement, the gearbox is equipped with a shifting mechanism, a speed and torque measuring device is set on the output shaft of the motor, and a torque measuring device is set on the output shaft of the gearbox. Start the motor and apply different environmental influences to the clutch spline and gearbox input shaft spline to make them reach different corrosion levels. Perform shifting tests under different corrosion levels and measure the speed and torque of the motor output shaft and the torque of the gearbox output shaft. Substitute the measured values ​​obtained through the above steps into the shift force calculation formula to calculate the shift force of different gears under different corrosion levels of the clutch. Compare these values ​​with the corresponding values ​​of a non-corroded clutch to quantify the impact of clutch corrosion on shift force. The formula for calculating the shifting force is: in, I0 is the inertia of the entire vehicle transferred to the gearbox output shaft, in kg.m 2 Synchronizer active component speed, rad / s Synchronizer driven speed, rad / s t s Synchronization time, sec M Synchronizer Capacity, D Synchronizer diameter, m Synchronous ring cone angle, ° Synchronous ring friction coefficient N. Gearbox input shaft speed, rpm i t The gear ratio of the transmission after shifting, i t0 The gear ratio before shifting; T f Transmission input shaft drag torque, Nm T fc Clutch drag torque, Nm F represents the force exerted on the synchronizer sleeve, N represents the force exerted on the synchronizer sleeve. N is the input shaft speed, in rpm. P is the operating force at the handle end, N is the operating force at the handle end. i s Transmission ratio from the gear sleeve to the handle end Transmission efficiency from the gear sleeve to the handle end.

2. The method for quantifying the effect of clutch corrosion on shifting force in a laboratory setting according to claim 1, characterized in that, The simulated power input is a motor with a flywheel, which is connected to the clutch. The simulated output load is a tail flywheel with the same moment of inertia as the rated load. The tail flywheel is connected to the output shaft of the gearbox to obtain power.

3. A non-transitory readable recording medium for storing one or more programs containing multiple instructions, characterized in that, When the instruction is executed, the processing circuit will perform the method for quantifying the effect of clutch corrosion on shifting force according to any one of claims 1-2.

4. A system for quantifying the effect of clutch corrosion on shifting force in a laboratory setting, comprising a processing circuit and a memory electrically coupled thereto, characterized in that, The memory is configured to store at least one program, the program containing multiple instructions, and the processing circuit runs the program to perform a method for quantifying the effect of clutch corrosion on shifting force in a laboratory setting, as described in any one of claims 1-2.

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