Method for measuring axial displacement of engine driving plate of power assembly of automatic transmission

Abstract

The invention discloses an automatic transmission power assembly engine driving plate axial displacement measuring method, and belongs to the technical field of transmissions. The method comprises: installing a sensor; debugging the sensor; other sensors on the vehicle are connected, and displacement data and important vehicle operation parameters are recorded; performing displacement testing according to a preset working condition; after the test is completed, performing manual filtering processing on the axial offset data of the driving board; performing time axis calibration on the filtered data and other data on the vehicle; and analyzing measurement data, and performing adaptive optimization for the working condition position with the maximum offset. According to the invention, the dynamic performance of the engine drive board under all working conditions can be accurately tested in a whole vehicle environment, the working state and fatigue strength of the drive board and the hydraulic torque converter are effectively evaluated, the iteration speed and test efficiency of parts are improved, the test cost is reduced, and the test efficiency is improved. And powerful data support is provided for optimizing the two designs, pre-judging the durability and ensuring the driving safety.

Description

Technical Field

[0001] The invention relates to a method for measuring the axial displacement of an engine drive plate of an automatic transmission power assembly, and belongs to the technical field of transmissions. Background Art

[0002] The torque converter is located between the engine and the transmission, responsible for transmitting torque during vehicle starting and gear shifting, and acts as a clutch under certain conditions. However, during vehicle operation, the torque converter will generate axial thrust while transmitting torque, which directly acts on the drive plate between the engine and the transmission, causing the drive plate to shift in the axial direction.

[0003] During normal vehicle driving, especially in cases of frequent gear shifting, acceleration or deceleration, the axial displacement of the drive plate will become very frequent and the displacement amplitude may be large. If this high-frequency, large-amplitude displacement persists, it may lead to fatigue accumulation of the drive plate material, which in turn may cause deformation or even fracture of the drive plate, ultimately affecting the normal operation of the vehicle. Therefore, studying the axial displacement of the drive plate under different working conditions is of great significance for preventing early failure of the drive plate and improving the reliability of the automotive powertrain system.

[0004] In the prior art, the research on the axial displacement of the drive plate is mainly focused on static or quasi-static conditions, that is, measurement and analysis under relatively stable working conditions. However, this method cannot fully reflect the actual displacement of the drive plate during the actual operation of the vehicle, especially in complex and changeable driving environments.

[0005] Traditional measurement methods are limited by technical conditions and are difficult to capture high-speed, high-frequency dynamic displacement changes. Especially in the state of the whole vehicle, how to accurately measure the axial displacement of the drive plate in actual use has become a technical problem. In addition, the existing test methods often need to be carried out after disassembling some powertrain components. Not only is the operation complicated and time-consuming, but it is also unable to fully simulate the dynamic working conditions of the vehicle in actual operation. Therefore, there is an urgent need for a method that can accurately measure the axial displacement of the drive plate under specific working conditions in the state of the whole vehicle. Summary of the invention

[0006] In order to solve the problems existing in the background technology, the present invention provides a method for measuring the axial displacement of an engine drive plate of an automatic transmission powertrain.

[0007] To achieve the above object, the present invention adopts the following technical solution: a method for measuring the axial displacement of an engine drive plate of an automatic transmission powertrain, the method comprising the following steps:

[0008] S1: Install the sensor;

[0009] S101: Design, manufacture and install the mounting bracket of the axial displacement sensor of the drive plate according to the mounting holes for the drive plate and the torque converter reserved in the engine and the mounting positions of the surrounding mounting bolts;

[0010] S102: Install the laser displacement sensors one by one on the mounting brackets, and test the working status of the sensors to ensure that the sensors work normally.

[0011] S2: debug sensor;

[0012] S3: Connect to other sensors on the vehicle to record displacement data and important vehicle operating parameters;

[0013] S4: Perform displacement test according to preset working conditions;

[0014] The preset working conditions include:

[0015] Working condition 1: Conduct full throttle acceleration test of 2H, 4H or 2H, 4L in the test field or on a straight road;

[0016] Working condition 2: Conduct 2H, 4H or 2H, 4L driving tests on a bumpy road section of the test site;

[0017] Working condition three: Carry out 2H, 4H or 2H, 4L hill-climbing driving test on the slope section of the test site.

[0018] S5: After the test is completed, the axial offset data of the driving plate is manually filtered;

[0019] S501: consider data points in the time domain curve that exceed 1.5 times the yield strength of the reference plane data of the driving plate as error points to be filtered;

[0020] S502: According to the current engine speed, the number of measurement points of a bolt at the speed is calculated, and the number of measurement points is compared with the total number of error points to be filtered. If the verification parameter is between 70% and 130%, the error point data to be filtered is considered correct and can be filtered normally.

[0021] S503: Eliminate the point before the first point and the point after the last point of the error point to be filtered on the time domain curve to reduce the interference of the bolt flange on the measurement point.

[0022] S6: calibrate the filtered data with other data on the vehicle in time axis;

[0023] S7: Analyze the measurement data and perform adaptive optimization for the working position with the largest offset.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention can accurately test the dynamic performance of the engine drive plate under all working conditions in a whole vehicle environment, effectively evaluate the working status and fatigue strength of the drive plate and the torque converter, improve the iteration speed and test efficiency of parts, and reduce the test cost, thus providing strong data support for optimizing the design of both, predicting durability and ensuring driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of installing the axial displacement sensor of the present invention. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] A method for measuring the axial displacement of an engine drive plate of an automatic transmission powertrain, the method comprising the following steps:

[0029] S1: Install the sensor;

[0030] S101: Design, manufacture and install the mounting bracket of the axial displacement sensor of the drive plate according to the mounting holes for the drive plate and the torque converter reserved in the engine and the mounting positions of the surrounding mounting bolts;

[0031] S102: Install the laser displacement sensors one by one on the mounting brackets, and test the working status of the sensors to ensure that the sensors work normally.

[0032] S2: debug sensor;

[0033] Fine-tune the laser sampling point of the laser displacement sensor to ensure that the laser scanning circle passes through the center of the bolt circle, so that the incident light beam and the reflected light beam of the laser displacement sensor pass through the joint mounting hole of the drive plate and the torque converter, and the incident laser is perpendicular to the plane of the drive plate;

[0034] S3: Connect to other sensors on the vehicle to record displacement data and important vehicle operating parameters, such as engine speed, vehicle speed, engine output torque, turbine speed, accelerator pedal opening, output shaft speed, etc., for subsequent analysis;

[0035] S4: Perform displacement test according to preset working conditions;

[0036] The preset working conditions include

[0037] Working condition 1: Perform full throttle acceleration test at 2H, 4H or 2H, 4L in the test field or on a straight road according to actual road driving habits;

[0038] Working condition 2: Carry out 2H, 4H or 2H, 4L driving test on the bumpy road section of the test site according to actual road driving habits;

[0039] Working condition three: Carry out 2H, 4H or 2H, 4L slope driving test on the slope section of the test site according to actual road driving habits.

[0040] 2H is two-wheel drive, 4H is high-speed four-wheel drive, and 4L is low-speed four-wheel drive.

[0041] S5: After the test is completed, the axial offset data of the driving plate is manually filtered;

[0042] Since the axial displacement sensor is installed on the reserved mounting hole for the drive plate and the torque converter, the circumference of the laser scanning of the axial displacement sensor will definitely scan the drive plate and the torque converter mounting bolts, and the change in the displacement data caused by the bolts should not be used as valid data for analyzing the offset of the drive plate. Therefore, it is manually filtered, and the filtering process described in S5 is as follows:

[0043] S501: consider data points in the time domain curve that exceed 1.5 times the yield strength of the reference plane data of the driving plate as error points to be filtered;

[0044] S502: Calculate the number of measurement points of a bolt at the current engine speed, sampling frequency, bolt diameter and other parameters, and check and verify with the total number of error points to be filtered. If the verification parameter is between 70% and 130%, it is considered that the data of the error points to be filtered is correct and can be filtered normally.

[0045] S503: Eliminate the point before the first point and the point after the last point of the error point to be filtered on the time domain curve to reduce the interference of the bolt flange on the measurement point.

[0046] S6: calibrate the filtered data with other relevant data on the vehicle in time axis;

[0047] S7: Analyze the measurement data and perform adaptive optimization for the operating position with the largest offset by tightening the torque converter, strengthening the drive plate, and optimizing the ECU / TCU data to improve the overall durability and reliability of the powertrain.

[0048] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0049] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for measuring the axial displacement of an engine drive plate of an automatic transmission powertrain, characterized in that: The method comprises the following steps: S1: Install the sensor; S2: debug sensor; S3: Connect to other sensors on the vehicle to record displacement data and important vehicle operating parameters; S4: Perform displacement test according to preset working conditions; S5: After the test is completed, the axial offset data of the driving plate is manually filtered; S6: calibrate the filtered data with other data on the vehicle in time axis; S7: Analyze the measurement data and perform adaptive optimization for the working position with the largest offset.

2. The method for measuring the axial displacement of an engine drive plate of an automatic transmission powertrain according to claim 1, characterized in that: The S1 comprises the following steps: S101: Design, manufacture and install the mounting bracket of the axial displacement sensor of the drive plate according to the mounting holes for the drive plate and the torque converter reserved in the engine and the mounting positions of the surrounding mounting bolts; S102: Install the laser displacement sensors one by one on the mounting brackets, and test the working status of the sensors to ensure that the sensors work normally.

3. The method for measuring the axial displacement of an engine drive plate of an automatic transmission powertrain according to claim 2, characterized in that: The preset working conditions described in S4 include: Working condition 1: Conduct full throttle acceleration test of 2H, 4H or 2H, 4L in the test field or on a straight road; Working condition 2: Conduct 2H, 4H or 2H, 4L driving tests on a bumpy road section of the test site; Working condition three: Carry out 2H, 4H or 2H, 4L hill-climbing driving test on the slope section of the test site.

4. A method for measuring the axial displacement of an engine drive plate of an automatic transmission powertrain according to claim 1 or 3, characterized in that: The filtering process described in S5 is as follows: S501: consider data points in the time domain curve that exceed 1.5 times the yield strength of the reference plane data of the driving plate as error points to be filtered; S502: According to the current engine speed, the number of measurement points of a bolt at the speed is calculated, and the number of measurement points is compared with the total number of error points to be filtered. If the verification parameter is between 70% and 130%, the error point data to be filtered is considered correct and can be filtered normally. S503: Eliminate the point before the first point and the point after the last point of the error point to be filtered on the time domain curve to reduce the interference of the bolt flange on the measurement point.

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