A method for quickly verifying the durability of a manual transmission gear position

Abstract

The application provides a method for quickly verifying durability of a manual gearbox gear position, and the method comprises the following steps: selecting three-gear gear tooth root damage, three-gear gear tooth surface damage, three-gear shift fork wear and three-gear shift finger wear as control parameters; determining the number of gear shifts and target gear shift points of the three-gear position of the manual gearbox; driving the vehicle to enter a runway, and performing first round operation and second round operation in a low-speed gear shift working condition; performing operation in a high-speed gear shift working condition; disassembling the manual gearbox, measuring the three-gear gear tooth root damage and the three-gear gear tooth surface damage, calculating the three-gear shift fork wear and the three-gear shift finger wear, and verifying the results. The application can quickly verify the durability of the manual gearbox gear position, and the cycle is shorter and the cost is lower.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicle transmission device, in particular to a method for quickly verifying durability of gear position of manual transmission. BACKGROUND

[0002] Manual transmission is an important component of automobile, and the component needs to be tested for durability in the development process of vehicle to ensure no major repair within 300,000 kilometers. Various fatigue failures will inevitably occur in the durability test of manual transmission, such as failure of third gear of transmission. At present, the new rectification sample can only be verified by a new round of durability test, resulting in waste of project development time and cost. At present, the commonly used method for fatigue durability verification of manual transmission in the prior art includes the following methods:

[0003] Supplier component level bench fatigue durability test, in which a specific torque and speed are input through a program to act on the manual transmission. This method does not consider many other external factors, such as environment, driving habits, road conditions, system matching, etc., and the fatigue durability verification of manual transmission matching design is seriously insufficient.

[0004] Vehicle level powertrain assembly durability test. Although this method avoids the shortcomings of component level bench fatigue durability test, the traditional vehicle powertrain durability test takes up to 4 months and costs more than 400,000 yuan, which seriously affects the production of the project.

[0005] Vehicle level transmission special shift durability test, which includes shift operation verification of gears 1 to 6, takes up to 3 months and costs 300,000 yuan. Compared with the vehicle level powertrain assembly durability test, the test cycle and cost will be relatively lower, but it cannot meet the production time demand of the project.

[0006] Therefore, it is urgent to optimize the durability verification method of gear position of manual transmission and improve the design robustness of related parts. SUMMARY

[0007] In view of the defects in the prior art, the purpose of the present application is to provide a method for quickly verifying durability of gear position of manual transmission, which is based on precise control of durability test operation of signals such as accelerator pedal, steering, clutch pedal, shift lever and brake pedal, and quickly verifies the durability of third gear of manual transmission by comparing the damage of third gear tooth root, the damage of third gear tooth surface, the wear amount of third gear shift fork and the wear amount of third gear shift finger.

[0008] To achieve the above-mentioned purpose of the application, the present application provides the technical solution as follows:

[0009] A method for quickly verifying durability of gear position of manual transmission, the method comprising:

[0010] A1: Selecting three-gear gear tooth root damage D 3GTR , three-gear gear tooth surface damage D 3GTF , three-gear shift fork wear W 3BC , and three-gear shift finger wear W 3HDZ as a control parameter;

[0011] A2: Determine the number of gear shifts and target shift points of the three-gear manual transmission;

[0012] A3: Drive the vehicle into the runway, perform the first round of low-speed shift operation, accelerate at a preset acceleration a, and when the engine speed reaches N2, shift up, and maintain for a preset number of seconds t after shifting to three gears. Shift to two gears and coast with the throttle off, reaching V 1-2 and maintaining for t seconds; accelerate at an acceleration a, and when the engine speed reaches N2, shift up, and maintain for t seconds after shifting to three gears. Shift to two gears and coast with the throttle off, reaching V 1-2 and maintaining for t seconds; repeat the above operation 10000 times and stop;

[0013] wherein N2 is the maximum allowable engine speed that the second gear can reach, V 1-2 is the vehicle speed when accelerating from first gear to 75% N max , and N max is the maximum allowable engine speed;

[0014] A4: Perform the second round of low-speed shift operation, accelerate at an acceleration a, and when the engine speed reaches N2, shift up, and maintain for t seconds after shifting to four gears. Shift to three gears and coast with the throttle off, reaching V 2-3 and shifting to two gears; continue to coast with the throttle off, reaching V 1-2 and maintaining for t seconds; repeat the above operation 10000 times and stop;

[0015] wherein V 2-3 is the vehicle speed when accelerating from second gear to 75% N max ;

[0016] A5: Drive the vehicle into the runway and perform the high-speed shift operation, including the following steps:

[0017] A51: Accelerate at an acceleration a, and when the engine speed reaches N2, shift up, and shift to three gears;

[0018] A52: Continue to accelerate at an acceleration a after shifting to three gears, and when the engine speed reaches N2, shift to four gears;

[0019] A53: Continue to accelerate at an acceleration a after shifting to four gears, and when the engine speed reaches N2, maintain for t seconds;

[0020] A54: Release the throttle and glide to V 3-4 When , the gear is switched to the third gear and maintained for t seconds;

[0021] Repeat steps A52 to A54 above 10,000 times and then stop;

[0022] Among them, V 3-4 Accelerate to third gear until the engine speed is 75%N max Speed ​​at 100 km / h;

[0023] A6: After the test, dismantle the manual transmission and measure the damage D on the tooth root of the third gear. 3GTR and third gear tooth surface damage D 3GTF , calculate the wear amount W of the third gear shift fork 3BC and the third gear shift finger wear amount W 3HDZ , and verify the results; if the verification results meet expectations, determine the test operation plan; if the verification results do not meet expectations, modify the acceleration preset value a and the second preset value t and repeat steps A2 to A6.

[0024] Preferably, the test is conducted by manually or autonomously driving the vehicle.

[0025] Preferably, when the vehicle is automatically driven, a test route and special control points are set in advance via GPS, and the automatic driving equipment is pre-installed and the software is set.

[0026] Preferably, the runway is circular or a straight or winding track that can be traveled in both directions.

[0027] Preferably, the verification result includes: obtaining the user's third gear gear tooth root damage d 3GTR and third gear tooth surface damage d 3GTF ; If 50%≤d 3GTR / D 3GTR ≤200%, and 50%≤d 3GTF / D 3GTF ≤200%, and W 3BC ≤0.5mm, and W 3HDZ ≤0.5mm, the verification result is as expected.

[0028] According to the method for quickly verifying the durability of manual transmission gears provided by the present invention, the third-gear tooth root damage, the third-gear tooth surface damage, the third-gear shift fork wear and the third-gear shift finger wear are used as control parameters. Combined with the actual usage of the user's vehicle, the number of shifts and the target shift point of the third gear of the manual transmission are determined. Taking into account the smoothness and feasibility of the working condition operation, low-speed shifting working condition operations and high-speed shifting working condition operations are respectively carried out. Finally, the experimental results are verified based on the obtained user usage data. The test cycle is short and the cost is low.

[0029] Compared with the prior art, the present application has the following beneficial effects:

[0030] 1. The three-gear gear tooth root damage, three-gear gear tooth surface damage, three-gear shift fork wear and three-gear shift finger wear are selected as control parameters, data is easy to obtain, and the test operation is simple.

[0031] 2. The three-gear shift times and shift points of the manual gearbox are determined according to user data, and a reasonable durability verification scheme for quickly verifying the three-gear of the manual gearbox is formulated accordingly, so that the test cycle is shorter and the cost is lower. BRIEF DESCRIPTION OF DRAWINGS

[0032] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments with reference to the attached drawings.

[0033] Figure 1 A flowchart of the method for quickly verifying the durability of the gear position of the manual gearbox in the embodiment;

[0034] Figure 2 An automatic control principle diagram when the vehicle in the embodiment adopts an automatic driving mode;

[0035] Figure 3 A low-speed shift operating schematic diagram when the vehicle in the embodiment is subjected to a durability test;

[0036] Figure 4 A high-speed shift operating schematic diagram when the vehicle in the embodiment is subjected to a durability test. DETAILED DESCRIPTION

[0037] To make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts fall within the scope of protection of the present application.

[0039] It should be noted that similar reference numerals and letters refer to similar items throughout the accompanying drawings, and once an item is defined in one drawing, it is not necessary to further define and explain it in subsequent drawings. In addition, all directional references (such as upper, lower, left, right, front, rear, bottom, etc.) are in relation to the particular drawing figure under discussion, and are made merely for purposes of explanation and illustration. Further, the terms "first", "second", and the like, are used herein only to describe one of the items, and do not imply or suggest relative importance of, or a number of, the indicated items.

[0040] Figure 1 A flowchart of a method for quickly verifying durability of a manual transmission gear position is shown. In this embodiment, the method is used to quickly verify durability of a third gear position of a manual transmission. The method includes:

[0041] A1: selecting a third gear tooth root damage D 3GTR , a third gear tooth surface damage D 3GTF , a third gear shift fork wear W 3BC , and a third gear shift finger wear W 3HDZ as control parameters. The manual transmission is an important component of an automobile and is the core of the vehicle drive system. During gear shifting, internal parts contact each other and cause wear. Therefore, the wear of the parts is an important parameter for establishing a durability test specification.

[0042] A2: determining the number of gear shifts and target gear shift points of the third gear position of the manual transmission. The use of the third gear of the manual transmission includes pulling out and entering. According to the wear data of the control parameters of the third gear in the vehicle level power system assembly durability test, and in combination with the actual use of the user, the number of third gear operations and target gear shift points covering 90% of Chinese users are obtained, as shown in Table 1:

[0043] Table 1: Number of third gear operations and target gear shift points

[0044] Serial number Three-shift gear category Times Shift point 1 2nd gear to 3rd gear 30000 times [N2] 2 3rd gear to 4th gear 20000 times [N2] 3 4th gear to 3rd gear 20000 times V 3-4 ]]> 4 3rd gear to 2nd gear 30000 times V 2-3 ]]>

[0045] wherein N2 is the maximum allowable engine speed that can be reached in the second gear, V 2-3 is the vehicle speed when accelerating to 75% N max of the engine speed in the second gear, N max is the maximum allowable engine speed, V 3-4 is the vehicle speed when accelerating to 75% N max of the engine speed in the third gear.

[0046] A3: Drive the vehicle onto the runway and perform the first round of low-speed shifting. The vehicle can be driven manually or automatically. When driving automatically, it is necessary to pre-set the test route and special control points through GPS, and pre-install the automatic driving equipment and set the software. The automatic control principle is as follows: Figure 2 The runway can be a circular runway, a straight road or a zigzag road that can travel in both directions. In this embodiment, the vehicle is automatically driven and a 5.42 km long circular runway is selected.

[0047] In this embodiment, the preset acceleration value is 1.5m / s 2 , the preset value of seconds is 2s. When performing the first round of low-speed shifting operation, if Figure 3 As shown in Part A, after the vehicle enters the circular runway, it first moves at a speed of 1.5m / s 2 Accelerate with the acceleration, shift up when the engine speed reaches N2, shift up to third gear one by one and hold for 2 seconds; then shift to second gear and release the accelerator to coast to V 1-2 Then maintain for 2 seconds; again, the vehicle moves at 1.5m / s 2 Accelerate with the acceleration, shift up when the engine speed reaches N2, shift up to the third gear and hold it for 2 seconds; finally, shift to the second gear and release the accelerator to coast. V1-2 Repeat the above operation 10,000 times and then stop.

[0048] Among them, V 1-2 Accelerate to first gear until the engine speed is 75%N max The vehicle speed at that time.

[0049] A4: Perform the second round of low-speed shifting operation, such as Figure 3 As shown in Part B, first, the vehicle moves at a speed of 1.5 m / s 2 Accelerate with the acceleration, shift up when the engine speed reaches N2, shift up to the fourth gear one by one and hold it for 2 seconds; then, shift to the third gear and release the accelerator to glide to V 2-3 Shift to the second gear; finally, continue to release the accelerator and glide to V 1-2 Repeat the above operation 10,000 times and then stop.

[0050] A5: The autonomous vehicle enters a 5.42km long circular runway and performs high-speed gear shifting operations, such as Figure 4 As shown, including:

[0051] A51: 1.5m / s 2 Accelerate at full speed, shift up when the engine speed reaches N2, and shift up step by step to third gear;

[0052] A52: Shift to third gear and continue at 1.5 m / s 2acceleration, the engine speed reaches N2, the gear is switched to fourth gear;

[0053] A53: After the gear is switched to fourth gear, the vehicle continues to accelerate at the acceleration of 1.5 m / s 2 , the engine speed reaches N2, and the gear is maintained for 2 seconds;

[0054] A54: The throttle is released to V 3-4 , the gear is switched to third gear, and the gear is maintained for 2 seconds;

[0055] After the above steps A52-A54 are repeated 10,000 times, the test is stopped.

[0056] A6: After the test is completed, the manual transmission is disassembled, the gear tooth root damage D 3GTR and the gear tooth surface damage D 3GTF of the third gear are measured, the wear W 3BC of the third gear shift fork and the wear W 3HDZ of the third gear shift finger are calculated, and the results are verified; if the verification results meet the expectations, the test operation scheme is determined; if the verification results do not meet the expectations, the acceleration preset value and the second preset value are modified, and the steps A2-A5 are repeated.

[0057] Specifically, in terms of the verification results, the gear tooth root damage d 3GTR and the gear tooth surface damage d 3GTF of the third gear of the user are obtained; if 50%≤d 3GTR / D 3GTR ≤200%, and 50%≤user D 3GTF / D 3GTF ≤200%, and W 3BC ≤0.5 mm, and W 3HDZ ≤0.5 mm, the verification results meet the expectations.

[0058] In this embodiment, two vehicles are also selected to perform a rapid verification durability test A of the third gear of the manual transmission and a vehicle-level power system assembly durability test B, after the test is completed, the manual transmission is disassembled and the related dimensions are measured, and the results are shown in Table 2 as follows:

[0059] Table 2 Comparison of control parameter results after test

[0060] Control parameter Actual Third gear tooth root damage D 3GTR ]]> d 3GTR / A-D 3GTR =0.98, A-D 3GTR / B-D 3GTR =0.99]]> Three-gear gear tooth surface damage D 3GTF ]]> d 3GTR / A-D 3GTR =0.97, A-D 3GTR / B-D 3GTR =1.01]]> Wear amount W of three-shaft shift fork 3BC ]]> A-W 3BC = 0.06 mm, B-W 3BC = 0.05 mm]]> Wear amount W of the third shift fork 3HDZ ]]> A-W 3HDZ = 0.07 mm, B-W 3HDZ = 0.06 mm]]>

[0061] At the same time, the test method for rapid verification of the durability of the third gear of the manual transmission, the test cycle and the cost of the vehicle-level power system assembly durability test and the vehicle-level transmission special shift durability test are compared as shown in Table 3:

[0062] Table 3 Comparison of test cycle and cost of the present application and prior art

[0063] Test method Period (days) Cost (ten thousand yuan) Durability test method of manual transmission three-gear 40 10 Vehicle level power system assembly durability test 120 40 Vehicle level transmission special shift durability test 90 30

[0064] It can be seen that, in the case of results in line with expectations, the method of rapid verification of the three-gear durability of the manual gearbox adopted in the embodiment has a more obvious period shortening and cost reduction.

[0065] The specific embodiments of the present application are described above, and through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the present application.

Claims

1. A method for quickly verifying the durability of a manual transmission gear, characterized in that: The method comprises: A1: Select the third gear tooth root damage D 3GTR 、Third gear tooth surface damage D 3GTF , wear of third gear shift fork W 3BC and the third gear shift finger wear amount W 3HDZ As a control parameter; A2: Determine the number of shifts and target shift points for the three gears of a manual transmission; A3: Drive the vehicle onto the runway and perform the first round of low-speed shifting. Accelerate according to the preset acceleration a. When the engine speed reaches N2, shift up gear by gear to third gear and maintain the preset seconds t. After shifting to second gear, release the accelerator and coast until V 1-2 Then maintain it for t seconds; accelerate at acceleration a, shift up when the engine speed reaches N2, shift up gear by gear to third gear and maintain it for t seconds; after shifting to second gear, release the accelerator and glide to reach V 1-2 Then maintain for t seconds; repeat the above operation 10,000 times and then stop; Among them, N2 is the maximum allowable engine speed that can be achieved in the second gear, V 1-2 Accelerate to first gear until the engine speed is 75%N max Vehicle speed at time, N max is the maximum permissible engine speed; A4: Perform the second round of low-speed shifting operation, accelerating at acceleration a. When the engine speed reaches N2, shift up gear by gear to fourth gear and maintain it for t seconds. After shifting to third gear, release the accelerator and coast to reach V 2-3 Shift to the second gear in the rear gear; continue to release the accelerator and glide until the V 1-2 Then maintain for t seconds; repeat the above operation 10,000 times and then stop; Among them, V 2-3 Accelerate to the second gear until the engine speed is 75%N max Speed ​​at 100 km / h; A5: Drive the vehicle onto the runway and perform high-speed shifting operations, including the following steps: A51: Accelerate at acceleration a, shift up when the engine speed reaches N2, and shift up gear by gear to third gear; A52: After shifting to third gear, continue accelerating at acceleration a. When the engine speed reaches N2, shift to fourth gear. A53: After shifting to fourth gear, continue accelerating at acceleration a, and maintain the engine speed at N2 for t seconds; A54: Release the throttle and glide to V 3-4 When , the gear is switched to the third gear and maintained for t seconds; Repeat steps A52 to A54 above 10,000 times and then stop; Among them, V 3-4 Accelerate to third gear until the engine speed is 75%N max Speed ​​at 100 km / h; A6: After the test is completed, disassemble the manual transmission and measure the root damage D of the third gear. 3GTR and third gear tooth surface damage D 3GTF , calculate the wear amount W of the third gear shift fork 3BC and the third gear shift finger wear amount W 3HDZ , and verify the results; if the verification results meet expectations, determine the test operation plan; if the verification results do not meet expectations, modify the acceleration preset value a and the second preset value t and repeat steps A2 to A6.

2. The method for quickly verifying the durability of a manual transmission gear according to claim 1, characterized in that: When conducting trials, either by manual or autonomous vehicles.

3. The method for quickly verifying the durability of a manual transmission gear according to claim 2, characterized in that: When driving an autonomous vehicle, a test route and special control points are set in advance via GPS, and the autonomous driving equipment is pre-installed and the software is set.

4. The method for quickly verifying the durability of a manual transmission gear position according to claim 1, characterized in that: The runway is circular or a straight or zigzag track capable of bidirectional travel.

5. The method for quickly verifying the durability of a manual transmission gear position according to claim 1, characterized in that: The verification result includes: obtaining the user's third gear gear root damage d 3GTR And the user's third gear gear tooth surface damage d 3GTF ; If 50%≤d 3GTR / D 3GTR ≤200%, and 50%≤d 3GTF / D 3GTF ≤200%, and W 3BC ≤0.5mm, and W 3HDZ ≤0.5mm, the verification result is as expected.

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