Hydraulic system fluctuation testing device and method

Abstract

A hydraulic system fluctuation testing device and method belongs to the technical field of hydraulic system fluctuation testing. The device is as follows: the oil supply system outlet of the automatic transmission oil pump is connected to the valve body inlet through a flow meter, and each oil pressure channel of the valve body is connected to the inlet of each load clutch through an oil circuit. The oil supply systems of all load clutches and the automatic transmission oil pump are connected to the EATS test equipment signal through a digital acquisition module. The electronic control system of the EATS test equipment is electrically connected to the solenoid valve in the valve body, and the oil temperature control system is connected to the ETAS test equipment signal. The oil temperature control system and the control system of the automatic transmission oil pump are electrically connected to the ETAS test equipment through a hard line. The method is: first test the joint working performance of the automatic transmission oil pump and the valve body, and then test the working performance of the hydraulic system. The present invention achieves a detailed and accurate evaluation of the overall stability of the hydraulic system by testing the joint working performance of the automatic transmission oil pump, the valve body, and the load clutch.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydraulic system fluctuation testing, and in particular relates to a hydraulic system fluctuation testing device and method. Background Art

[0002] The automatic transmission's automatic shifting function is primarily achieved through the hydraulic system. The automatic transmission oil pump in this hydraulic system serves as the oil supply unit, and the valve body serves as the load unit. The load pressure of the automatic transmission oil pump is regulated and controlled by a solenoid valve. With the increase in automatic transmission gears, the pressure on the hydraulic system is increasing. Simply evaluating the performance of the automatic transmission oil pump and valve body is no longer sufficient to determine the stability of the hydraulic system. Summary of the Invention

[0003] The purpose of the present invention is to provide a hydraulic system fluctuation testing device and method in order to solve the above-mentioned problems existing in the prior art.

[0004] The present invention focuses on testing the entire hydraulic system and designs a testing device and method for comprehensively evaluating the fluctuation of the hydraulic system.

[0005] The present invention tests the joint working performance of the automatic transmission oil pump, valve body, and load clutch (ie, tests the fluctuation of the hydraulic system), thereby achieving a detailed and accurate evaluation of the overall stability of the hydraulic system.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A hydraulic system fluctuation test device, the hydraulic system including an automatic transmission oil pump, a valve body and multiple load clutches; the hydraulic system fluctuation test device including ETAS testing equipment and a data acquisition module;

[0008] The oil supply system outlet of the automatic transmission oil pump is connected to the valve body inlet through a flow meter, and the oil pressure channels of the valve body are connected to the inlets of each load clutch through an oil circuit. The oil supply systems of all load clutches and the automatic transmission oil pump are connected to the EATS test equipment signal through the data acquisition module. The electronic control system of the EATS test equipment is electrically connected to the solenoid valve in the valve body, and the oil temperature control system is connected to the ETAS test equipment signal. The oil temperature control system and the control system of the automatic transmission oil pump are electrically connected to the ETAS test equipment through hard lines.

[0009] A method for performing a hydraulic system fluctuation test using a hydraulic system fluctuation test device, the method comprising the following steps:

[0010] Step 1: Test the joint working performance of the automatic transmission oil pump and valve body, specifically:

[0011] The automatic transmission oil pump speed is controlled within the range of 600-5000 rpm, the oil temperature is controlled within the range of 40-120°C, and the main oil pressure of the valve body load is controlled within the range of 4-18 bar. The valve body outlet oil pressure signal at this time is collected through the data acquisition module. The oil pressure fluctuation amplitude is investigated by combining different working conditions of the automatic transmission oil pump and solenoid valve, and the vibration pattern of the automatic transmission oil pump and valve body is summarized.

[0012] Step 2: Test the joint working performance of the automatic transmission oil pump, valve body and load clutch, specifically:

[0013] Control the automatic transmission oil pump speed within the range of 600-5000rpm, control the automatic transmission oil pump oil temperature within the range of 40-120℃, control the valve body load main oil pressure within the range of 4-18bar, collect the oil pressure signal at the load clutch end through the digital acquisition module, investigate the oil pressure fluctuation amplitude through different working conditions of the automatic transmission oil pump and solenoid valve, summarize the hydraulic system jitter law, and compare it with the automatic transmission oil pump and valve body jitter law obtained in step 1, and analyze the impact of the single load clutch on the stability of the entire hydraulic system.

[0014] Compared to existing technologies, the present invention offers the following advantages: it can test the operating conditions of the automatic transmission oil pump, valve body load clutch, and all three components operating simultaneously, monitor and compare oil pressure, and assess the mutual influence between components in the hydraulic system. This greatly simulates actual operating conditions, ensuring smooth testing. Furthermore, the present invention offers advantages such as ease of operation and reliability, while also reducing testing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a hydraulic system fluctuation testing device of the present invention.

[0016] The names and numbers of the components involved in the above drawings are as follows:

[0017] Oil temperature control system 1, automatic transmission oil pump supply system 2, flow meter 3, ETAS test equipment 4, valve body 5, load clutch 6, data acquisition module 7. DETAILED DESCRIPTION

[0018] Specific implementation method 1: Figure 1 As shown, this embodiment discloses a hydraulic system fluctuation test device, wherein the hydraulic system includes an automatic transmission oil pump, a valve body 5 and multiple load clutches 6; the hydraulic system fluctuation test device includes an ETAS test device 4 and a data acquisition module 7;

[0019] The outlet of the oil supply system 2 of the automatic transmission oil pump is connected to the inlet of the valve body 5 through the flowmeter 3, and the oil pressure channels of the valve body 5 are connected to the inlets of each load clutch 6 through the oil circuit. All load clutches 6 and the oil supply system 2 of the automatic transmission oil pump are signal-connected to the EATS test equipment 4 through the digital acquisition module 7. The electronic control system of the EATS test equipment 4 is electrically connected to the solenoid valve in the valve body 5 (the current of the solenoid valve is controlled by the electronic control system of the EATS test equipment 4 to adjust the load pressure). The oil temperature control system 1 is signal-connected to the ETAS test equipment 4. The oil temperature control system 1 and the control system of the automatic transmission oil pump are electrically connected to the ETAS test equipment 4 through a hard wire (the oil temperature control system 1 and the control system of the automatic transmission oil pump are controlled by the upper computer software of the test bench (preferably the AUTOMAX test bench), and the pressure signal of the automatic transmission oil pump and the control information of the solenoid valve are collected through the digital acquisition module 7).

[0020] The data acquisition module 7 collects information on the load pressure of the load clutch 6 and the information on the automatic transmission oil pump 2 (hydraulic pressure, temperature, flow, torque), providing strong support for subsequent data analysis, comparison, investigation and collection of data by the ETAS test equipment 4, ensuring test control precision and accuracy. At the same time, the ETAS test equipment 4 controls the current of the solenoid valve through its electronic control system to adjust different pressure loads.

[0021] The data acquisition module 7 synchronously collects all test unit information (including automatic transmission oil pump speed, torque, flow, oil temperature, solenoid valve current, load clutch 6 pressure); and synchronously analyzes all test data through the ETAS test equipment 4.

[0022] Specific implementation method 2: Figure 1 As shown, this embodiment discloses a method for performing a hydraulic system fluctuation test using the testing device described in the first embodiment, the method comprising the following steps:

[0023] Step 1: Test the working performance of the automatic transmission oil pump and valve body 5 (the valve body 5 is not connected to the inlet of the load clutch 6), specifically:

[0024] The automatic transmission oil pump speed is controlled within the range of 600-5000 r / min, the automatic transmission oil pump oil temperature is controlled within the range of 40-120°C, and the load main oil pressure of the valve body 5 is controlled within the range of 4-18 bar. The valve body 5 outlet oil pressure signal at this time is collected through the data acquisition module 7. Through different operating conditions of the automatic transmission oil pump and the solenoid valve (under different automatic transmission oil pump speed conditions, different currents are controlled in the solenoid valve to collect speed, torque, pressure, and flow information at this time), the oil pressure fluctuation amplitude is investigated (the pressure jitter point is found), and the jitter pattern of the automatic transmission oil pump and the valve body 5 is summarized (ETAS test equipment 4 is equipped with INCA-MDA software. All data collected by the data acquisition module 7 are analyzed by the ETAS test equipment 4, and the data is processed by INCA-MDA software to summarize the pressure jitter pattern);

[0025] Step 2: Test the joint working performance of the automatic transmission oil pump, valve body 5 and load clutch 6 (the three constitute the hydraulic system) (the valve body 5 is connected to the inlet of the load clutch 6), specifically:

[0026] Control the automatic transmission oil pump speed within the range of 600-5000rpm, control the automatic transmission oil pump oil temperature within the range of 40-120℃, control the valve body 5 load main oil pressure within the range of 4-18bar, collect the oil pressure signal at the load clutch 6 end through the digital acquisition module 7, and through different working conditions of the automatic transmission oil pump and the solenoid valve (control different currents of the solenoid valve at different speeds of the automatic transmission oil pump, and collect the speed, torque, pressure, and flow information at this time), investigate the oil pressure fluctuation amplitude (find the point of pressure jitter), summarize the hydraulic system jitter law (ETAS test equipment 4 is equipped with INCA-MDA software, and all data collected by the digital acquisition module 7 are analyzed by ETAS test equipment 4, and the data are processed by INCA-MDA software to summarize the pressure jitter law), and compare with the automatic transmission oil pump and valve body 5 jitter law obtained in step 1 to analyze the impact of the single load clutch 6 on the stability of the entire hydraulic system.

[0027] The present invention utilizes the original traditional oil pump test bench (including: an oil temperature control system 1, an oil pump drive motor and a flow meter 3. The oil pump drive motor provides power for the automatic transmission oil pump and can support different speeds of the automatic transmission oil pump in actual working conditions). It also adds ETAS test equipment 4 (including INCA-MDA software + TCU + wiring harness) and a data acquisition module 7 (including INCA software). The data acquisition module 7 uniformly collects information and simulates different working conditions to verify the stability of the hydraulic system.

[0028] The valve body 5 is adjusted to different oil pressures and loads through the valve body control system, and the information collected by the data acquisition module 7 is sent to the ETAS test equipment 4.

[0029] Example 1:

[0030] This embodiment describes a method for testing hydraulic system fluctuations using a hydraulic system fluctuation testing device. The method is to test the oil pressure stability of an automatic transmission oil pump under the full range of performance, and its purpose is to detect the oil pressure stability.

[0031] Test method: Test according to the conditions in Table 1: record the automatic transmission oil pump speed, oil temperature, torque, and load clutch 6 pressure.

[0032] Table 1:

[0033]

[0034] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A method for implementing a hydraulic system fluctuation test device, wherein the hydraulic system comprises an automatic transmission oil pump, a valve body (5), and a plurality of load clutches (6); characterized in that: The hydraulic system fluctuation test device includes an ETAS test device (4) and a data acquisition module (7); The outlet of the oil supply system (2) of the automatic transmission oil pump is connected to the inlet of the valve body (5) through the flow meter (3), and each oil pressure channel of the valve body (5) is connected to the inlet of each load clutch (6) through the oil circuit. All load clutches (6) and the oil supply system (2) of the automatic transmission oil pump are connected to the EATS test equipment (4) through the data acquisition module (7). The electronic control system of the EATS test equipment (4) is electrically connected to the solenoid valve in the valve body (5). The oil temperature control system (1) is connected to the ETAS test equipment (4) through the signal. The oil temperature control system (1) and the control system of the automatic transmission oil pump are electrically connected to the ETAS test equipment (4) through hard wires. The method comprises the following steps: Step 1: Test the working performance of the automatic transmission oil pump and valve body (5), specifically: The speed of the automatic transmission oil pump is controlled within the range of 600-5000 r / min, the oil temperature of the automatic transmission oil pump is controlled within the range of 40-120°C, and the load main oil pressure of the valve body 5 is controlled within the range of 4-18 bar. The oil pressure signal of the valve body (5) outlet is collected by the data acquisition module (7). The oil pressure fluctuation amplitude is investigated by combining the automatic transmission oil pump and the solenoid valve under different working conditions, and the vibration law of the automatic transmission oil pump and the valve body (5) is summarized. Step 2: Test the working performance of the automatic transmission oil pump, valve body (5) and load clutch (6), specifically: The speed of the automatic transmission oil pump is controlled within the range of 600-5000rpm, the oil temperature of the automatic transmission oil pump is controlled within the range of 40-120℃, and the main oil pressure of the valve body (5) is controlled within the range of 4-18bar. The oil pressure signal at the load clutch (6) end is collected through the data acquisition module (7). The oil pressure fluctuation amplitude is investigated through different working conditions of the automatic transmission oil pump and the solenoid valve. The vibration law of the hydraulic system is summarized and compared with the vibration law of the automatic transmission oil pump and the valve body (5) obtained in step 1. The influence of the single load clutch (6) on the stability of the entire hydraulic system is analyzed.

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