阅读说明：本技术 液控系统液压油泄漏测试方法及系统 (Hydraulic oil leakage testing method and system for hydraulic control system ) 是由 殷艳飞 黄新志 杨毅骁 邓云飞 梁东伟 戴良顺 于 2020-06-01 设计创作，主要内容包括：本申请涉及一种液控系统液压油泄漏测试方法及系统,液控系统液压油泄漏测试方法包括：预设温度下,在液控系统压力达到第一压力时开始保压预设时长,并记录预设时长内的温度变化数据、压力变化数据及液压油体积变化数据；根据预设时长内的温度变化数据、压力变化数据、液压油体积变化数据与预设公式计算液控系统从第一压力下降至第二压力时液压油的泄漏量,预设公式根据多个合格液控系统在预设温度下从第一压力下降至第二压力时统计的泄漏量-时长曲线拟合得到。本申请适用于带有蓄能器的高压液控系统或变速器,可以提高对液控系统的泄漏量测试的准确度,缩短测试时间,提高了研发和生产过程中测试的效率。(The application relates to a hydraulic control system hydraulic oil leakage test method and a hydraulic control system hydraulic oil leakage test system, wherein the hydraulic control system hydraulic oil leakage test method comprises the following steps: at a preset temperature, when the pressure of the hydraulic control system reaches a first pressure, pressure maintaining is carried out for a preset time, and temperature change data, pressure change data and hydraulic oil volume change data in the preset time are recorded; and calculating the leakage amount of the hydraulic oil when the hydraulic control systems are reduced from the first pressure to the second pressure according to the temperature change data, the pressure change data and the hydraulic oil volume change data in the preset time and a preset formula, wherein the preset formula is obtained by fitting a leakage amount-time curve counted when the plurality of qualified hydraulic control systems are reduced from the first pressure to the second pressure at the preset temperature. The high-pressure hydraulic control system or the transmission with the energy accumulator is suitable for the high-pressure hydraulic control system or the transmission with the energy accumulator, the accuracy of leakage quantity testing of the hydraulic control system can be improved, the testing time is shortened, and the testing efficiency in the research and development and production processes is improved.)

1. A hydraulic oil leakage test method for a hydraulic system is characterized by comprising the following steps:

at a preset temperature, when the pressure of the hydraulic control system reaches a first pressure, pressure maintaining is carried out for a preset time, and temperature change data, pressure change data and hydraulic oil volume change data in the preset time are recorded;

and calculating the leakage amount of the hydraulic oil when the hydraulic control system is reduced from the first pressure to the second pressure according to the temperature change data, the pressure change data, the hydraulic oil volume change data and a preset formula in the preset time, wherein the preset formula is obtained by fitting a leakage amount-time curve which is counted when a plurality of qualified hydraulic control systems are reduced from the first pressure to the second pressure at the preset temperature.

2. The method for testing the leakage of hydraulic oil in the hydraulic control system according to claim 1, wherein the preset formula is a preset fitting relation between the leakage amount when the first pressure is decreased to the second pressure and the average leakage amount, the average temperature and the temperature fluctuation value in the preset time period, and the calculating the leakage amount of hydraulic oil when the hydraulic control system is decreased from the first pressure to the second pressure according to the temperature change data, the pressure change data and the hydraulic oil volume change data in the preset time period and the preset formula comprises:

calculating the average leakage amount of the hydraulic oil in the preset time according to the pressure change data and the hydraulic oil volume change data, and calculating the average temperature and the temperature fluctuation value in the preset time according to the temperature change data;

and calculating the leakage amount of the hydraulic control system when the first pressure is reduced to the second pressure according to the preset formula.

3. The hydraulic oil leakage test method for the hydraulic control system according to claim 2, wherein the preset temperature is 30 ℃, the first pressure is 60bar, the second pressure is 40bar, and the preset time is 30 s.

4. The hydraulic oil leakage testing method for the hydraulic control system according to claim 3, wherein the preset formula is as follows:

or, Q ═ 0.0081T²-0.6443T-0.0011Q₀ ²-0.0841Q₀-0.842ΔT+17.341

Wherein Q is the leakage, unit: ml/min; t, is the average temperature, in units: DEG C; Δ T, which is the temperature fluctuation value, in units: DEG C; q₀The average leakage is given in units: ml/min.

5. The method of claim 1, wherein the predetermined formula is a predetermined fitting relationship between a leakage amount when the first pressure is decreased to the second pressure and an average leakage amount, a difference between an average temperature and the predetermined temperature, and a temperature fluctuation value in the predetermined time period, and the calculating the leakage amount of the hydraulic oil when the hydraulic control system is decreased from the first pressure to the second pressure according to the temperature change data, the pressure change data, the hydraulic oil volume change data, and the predetermined formula includes:

calculating the average leakage amount of the hydraulic oil in the preset time according to the pressure change data and the hydraulic oil volume change data, and calculating the difference between the average temperature and the preset temperature in the preset time and the temperature fluctuation value according to the temperature change data;

and calculating the leakage amount of the hydraulic control system when the first pressure is reduced to the second pressure according to the preset formula.

6. The hydraulic oil leakage test method for the hydraulic control system according to claim 5, wherein the preset temperature is 30 ℃, the first pressure is 60bar, the second pressure is 40bar, and the preset time is 30 s.

7. The hydraulic oil leakage testing method for the hydraulic control system according to claim 6, wherein the preset formula is as follows:

or, Q ═ 0.0081T'²-0.1583T'-0.0011Q₀ ²-0.0841Q₀-0.842ΔT+5.302

Wherein Q is the leakage, unit: ml/min; t' is the difference between the average temperature and the preset temperature, in units: DEG C; Δ T, which is the temperature fluctuation value, in units: DEG C; q₀The average leakage is given in units: ml/min.

8. The method for testing the hydraulic oil leakage of the hydraulic control system according to claim 2 or 5, wherein the calculating the average leakage amount of the hydraulic oil in the preset time period according to the pressure change data and the hydraulic oil volume change data comprises:

recording a first hydraulic oil volume corresponding to a maximum pressure value in the pressure change data in the hydraulic oil volume change data and a second hydraulic oil volume corresponding to a minimum pressure value in the pressure change data;

calculating the average leakage amount of the hydraulic oil in the preset time according to the following formula:

Q₀＝(V₁-V₂)/T

wherein, T is the preset duration, unit: min; v₁The volume of the first hydraulic oil is as follows: ml; v₂The volume of the second hydraulic oil is in unit: ml; q₀The average leakage is given in units: ml/min.

9. The hydraulic oil leakage test method for the hydraulic control system according to claim 1, further comprising:

under a preset temperature, obtaining a plurality of groups of leakage quantity-time length curves of a plurality of qualified hydraulic control systems from the first pressure to the second pressure, and recording the average leakage quantity, the average temperature and the temperature fluctuation value corresponding to the leakage quantity-time length curves in a preset time length;

acquiring the hydraulic oil leakage amount corresponding to the leakage amount-time length curve with the temperature fluctuation value smaller than the preset temperature fluctuation value;

and performing curve fitting on the average leakage amount, the average temperature, the temperature fluctuation value and the hydraulic oil leakage amount obtained according to the plurality of leakage amount-time length curves to obtain the preset formula.

10. A hydraulic system hydraulic oil leakage test system, comprising a memory and a processor, wherein the memory is used for storing at least one program instruction, and the processor is used for implementing the hydraulic system hydraulic oil leakage test method according to any one of claims 1 to 9 by loading and executing the at least one program instruction.

Technical Field

The invention relates to the field of hydraulic test, in particular to a hydraulic oil leakage test method and system for a hydraulic control system.

Background

In the new generation of transmission products, the hydraulic control system often uses a high-pressure hydraulic control system with an accumulator, and the accumulator of the hydraulic control system is used for storing hydraulic oil with certain pressure to provide the required pressure and flow for the system. Before the high-pressure hydraulic control system is offline, the sealing performance of the high-pressure hydraulic control system needs to be tested, and the leakage amount of hydraulic oil is guaranteed to be smaller than or equal to a standard value, wherein the pressure and the temperature of the system are main factors influencing the leakage amount of the high-pressure hydraulic control system.

In the process of testing the off-line performance of the high-pressure hydraulic control system module, the set temperature is 25-35 ℃ usually, and the temperature control of the rack usually has fluctuation of about +/-5 ℃, so that the leakage test result of the high-pressure hydraulic control system is greatly changed, and the large difference of the leakage test result is not favorable for being used as a judgment standard for judging whether the performance is qualified or not. In addition, in the process of testing the bench performance of the transmission, the temperature rise by self operation may cause large errors, the temperature control is relatively inaccurate, the difference between the actual temperature and the target temperature is large, and the result of testing the leakage performance of the transmission is also inaccurate. As shown in figure 1, leakage test is carried out on the same high-pressure hydraulic control system module, leakage measurement data of nearly 200 times are counted, partial leakage data with constant temperature of 30 ℃ and small temperature fluctuation are extracted and compared with leakage data with actual temperature fluctuation, when temperature fluctuation exists, the leakage data and the leakage data with the actual temperature of 30 ℃ have large deviation, the fluctuation range is 2.1-3.2ml/min, the leakage data of the actual system at the temperature of 30 ℃ are basically 2.5-2.8ml/min, and the deviation easily causes misjudgment of results.

In addition, in the leakage quantity performance test process of the off-line of the high-pressure hydraulic control system module, because the oil temperature is lower, the oil viscosity is larger, the system leakage quantity is smaller, the high-pressure oil stored in the energy accumulator is slowly consumed in the process that the pressure of the hydraulic control system is reduced to 40bar from 60bar, and then the test is carried out in a longer time, which is very unfavorable for the efficiency of the performance test.

Disclosure of Invention

In view of the above technical problems, the application provides a hydraulic oil leakage testing method and system for a hydraulic control system, which can improve the accuracy of the leakage testing of the hydraulic control system, shorten the testing time, and improve the testing efficiency in the research and development and production processes.

In order to solve the technical problem, the application provides a hydraulic oil leakage test method for a hydraulic control system, which comprises the following steps:

at a preset temperature, when the pressure of the hydraulic control system reaches a first pressure, pressure maintaining is carried out for a preset time, and temperature change data, pressure change data and hydraulic oil volume change data in the preset time are recorded;

and calculating the leakage amount of the hydraulic oil when the hydraulic control system is reduced from the first pressure to the second pressure according to the temperature change data, the pressure change data, the hydraulic oil volume change data and a preset formula in the preset time, wherein the preset formula is obtained by fitting a leakage amount-time curve which is counted when a plurality of qualified hydraulic control systems are reduced from the first pressure to the second pressure at the preset temperature.

Wherein, predetermine the formula and be followed leak the volume when first pressure drops to second pressure with predetermine the predetermined fit relational expression between the average leakage volume in the predetermined length of time, average temperature, the temperature fluctuation value, according to temperature change data, pressure change data, the hydraulic oil volume change data in the predetermined length of time and predetermined formula calculate the leakage volume of hydraulic control system hydraulic oil when first pressure drops to second pressure includes:

calculating the average leakage amount of the hydraulic oil in the preset time according to the pressure change data and the hydraulic oil volume change data, and calculating the average temperature and the temperature fluctuation value in the preset time according to the temperature change data;

and calculating the leakage amount of the hydraulic control system when the first pressure is reduced to the second pressure according to the preset formula.

Wherein the preset temperature is 30 ℃, the first pressure is 60bar, the second pressure is 40bar, and the preset time is 30 s.

Wherein the preset formula is as follows:

or, Q ═ 0.0081T²-0.6443T-0.0011Q₀ ²-0.0841Q₀-0.842ΔT+17.341

Wherein Q is the leakage, unit: ml/min; t, is the average temperature, in units: DEG C; Δ T, which is the temperature fluctuation value, in units: DEG C; q₀The average leakage is given in units: ml/min.

Wherein, predetermine the formula and be followed leak the volume when first pressure drops to second pressure with predetermine the predetermined fit relational expression between the average leakage volume in the predetermined duration, average temperature and predetermine the difference of temperature, the temperature fluctuation value, according to temperature change data, pressure change data, the hydraulic oil volume change data in the predetermined duration and predetermine the formula and calculate the leakage volume of hydraulic oil when hydraulic control system drops to second pressure from first pressure includes:

calculating the average leakage amount of the hydraulic oil in the preset time according to the pressure change data and the hydraulic oil volume change data, and calculating the difference between the average temperature and the preset temperature in the preset time and the temperature fluctuation value according to the temperature change data;

and calculating the leakage amount of the hydraulic control system when the first pressure is reduced to the second pressure according to the preset formula.

Wherein the preset temperature is 30 ℃, the first pressure is 60bar, the second pressure is 40bar, and the preset time is 30 s.

Wherein the preset formula is as follows:

or, Q ═ 0.0081T'²-0.1583T'-0.0011Q₀ ²-0.0841Q₀-0.842ΔT+5.302

Wherein Q is the leakage, unit: ml/min; t' is the difference between the average temperature and the preset temperature, in units: DEG C; Δ T, which is the temperature fluctuation value, in units: DEG C; q₀The average leakage is given in units: ml/min.

Wherein, according to the pressure change data, the hydraulic oil volume change data calculate the average leakage amount of the hydraulic oil in the preset duration, including:

recording a first hydraulic oil volume corresponding to a maximum pressure value in the pressure change data in the hydraulic oil volume change data and a second hydraulic oil volume corresponding to a minimum pressure value in the pressure change data;

calculating the average leakage amount of the hydraulic oil in the preset time according to the following formula:

Q₀＝(V₁-V₂)/T

wherein, T is the preset duration, unit: min; v₁The volume of the first hydraulic oil is as follows: ml; v₂The volume of the second hydraulic oil is in unit: ml; q₀The average leakage is given in units: ml/min.

Wherein, the method further comprises:

under a preset temperature, obtaining a plurality of groups of leakage quantity-time length curves of a plurality of qualified hydraulic control systems from the first pressure to the second pressure, and recording the average leakage quantity, the average temperature and the temperature fluctuation value corresponding to the leakage quantity-time length curves in a preset time length;

acquiring the hydraulic oil leakage amount corresponding to the leakage amount-time length curve with the temperature fluctuation value smaller than the preset temperature fluctuation value;

and performing curve fitting on the average leakage amount, the average temperature, the temperature fluctuation value and the hydraulic oil leakage amount obtained according to the plurality of leakage amount-time length curves to obtain the preset formula.

The invention also provides a hydraulic system hydraulic oil leakage testing system which comprises a memory and a processor, wherein the memory is used for storing at least one program instruction, and the processor is used for realizing the hydraulic system hydraulic oil leakage testing method by loading and executing the at least one program instruction.

The invention provides a hydraulic oil leakage test method and a hydraulic oil leakage test system for a hydraulic control system, wherein the hydraulic oil leakage test method for the hydraulic control system comprises the following steps: at a preset temperature, when the pressure of the hydraulic control system reaches a first pressure, pressure maintaining is carried out for a preset time, and temperature change data, pressure change data and hydraulic oil volume change data in the preset time are recorded; and calculating the leakage amount of the hydraulic oil when the hydraulic control systems are reduced from the first pressure to the second pressure according to the temperature change data, the pressure change data, the hydraulic oil volume change data and a preset formula in the preset time, wherein the preset formula is obtained by fitting the leakage amount-time length curve counted when the plurality of qualified hydraulic control systems are reduced from the first pressure to the second pressure in the preset temperature. The high-pressure hydraulic control system or the transmission with the energy accumulator is suitable for the high-pressure hydraulic control system or the transmission with the energy accumulator, the accuracy of leakage quantity testing of the hydraulic control system can be improved, the testing time is shortened, and the testing efficiency in the research and development and production processes is improved.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

FIG. 1 is a graph comparing the leakage of hydraulic oil when a hydraulic control system is at a constant temperature of 30 ℃ and temperature fluctuation exists in the prior art;

FIG. 2 is a schematic flow chart illustrating a hydraulic oil leakage testing method for a hydraulically controlled system according to a first embodiment;

FIG. 3 is a flowchart illustrating a method for testing hydraulic oil leakage of a hydraulically controlled system according to a first embodiment;

FIG. 4 is a graph comparing data showing the average leak and the leak corrected using equation (1) according to the first embodiment;

FIG. 5 is a graph comparing data showing the average leak amount and the leak amount corrected using equation (2) according to the first embodiment;

FIG. 6 is a graph of leakage versus time length for a plurality of sets shown in accordance with a second embodiment;

fig. 7 is a schematic structural diagram of a hydraulic oil leakage test system of a hydraulically controlled system according to a third embodiment.

Detailed Description

The following description of the embodiments of the present application is provided for illustrative purposes, and other advantages and capabilities of the present application will become apparent to those skilled in the art from the present disclosure.

In the following description, reference is made to the accompanying drawings that describe several embodiments of the application. It is to be understood that other embodiments may be utilized and that mechanical, structural, electrical, and operational changes may be made without departing from the spirit and scope of the present application. The following detailed description is not to be taken in a limiting sense, and the scope of embodiments of the present application is defined only by the claims of the issued patent. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Although the terms first, second, etc. may be used herein to describe various elements in some instances, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.

Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, steps, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, steps, operations, elements, components, species, and/or groups thereof. The terms "or" and/or "as used herein are to be construed as inclusive or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a; b; c; a and B; a and C; b and C; A. b and C ". An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.

First embodiment

Fig. 2 is a schematic flow chart of a hydraulic oil leakage test method for a hydraulic control system according to a first embodiment. Fig. 3 is a flowchart illustrating a hydraulic oil leakage test method for a pilot-controlled system according to a first embodiment. Referring to fig. 2 and fig. 3, the method for testing hydraulic oil leakage of a hydraulic control system of the present embodiment includes:

step 201, at a preset temperature, when the pressure of the hydraulic control system reaches a first pressure, pressure maintaining is started for a preset time period, and temperature change data, pressure change data and hydraulic oil volume change data within the preset time period are recorded.

The hydraulic control system of the embodiment can be called a high-pressure hydraulic control system with an accumulator or a transmission. By setting the preset temperature to be 30 ℃, the actual temperature fluctuates within the range of 25-35 ℃, the lower temperature is beneficial to the operation of personnel or the operation of flowing into the next post, the time of the heating and cooling process is saved compared with the high-temperature test, and the offline efficiency can be improved. The temperature setting can be performed on a bench or a hydraulic bench, which usually has a tank for supplying the oil required for the test, and which usually has the function of cooling and heating the hydraulic oil for controlling the temperature of the hydraulic oil. In the performance test process of the high-pressure hydraulic control system module, the temperature is usually required to be set, after the temperature is set, the temperature sensor can monitor the temperature of the oil tank, and the performance test can be started after the temperature is reached. And then, an electronic oil pump is adopted to pressurize the hydraulic control system to a first pressure of 60bar, a system pressure valve is opened, the hydraulic control system is in a pressure maintaining state to carry out leakage rate test, and temperature change data, pressure change data and hydraulic oil volume change data within a preset time of 30s are collected and recorded. And releasing the hydraulic oil until the pressure is reduced to 0bar after the system maintains the pressure for 30s, and completing the leakage rate test of the hydraulic control system.

Step 202, calculating the leakage amount of the hydraulic oil when the hydraulic control system is reduced from the first pressure to the second pressure according to the temperature change data, the pressure change data, the hydraulic oil volume change data and a preset formula in the preset time, wherein the preset formula is obtained by fitting a leakage amount-time curve which is counted when the plurality of qualified hydraulic control systems are reduced from the first pressure to the second pressure at the preset temperature.

And analyzing the stored temperature and pressure data, judging the pressure range of the system, inquiring the volume of the hydraulic oil stored in the energy accumulator according to the maximum value and the minimum value of the pressure, and calculating the volume of the hydraulic oil released by the energy accumulator within 30s, wherein the maximum pressure is 60bar, namely the pressure maintaining process starting time. Then, the temperature data in 30s of the system leakage quantity test process is analyzed, the average value T of the 30s temperature data is calculated, and the range delta T of the 30s temperature fluctuation is counted.

Then, the average leakage amount of the hydraulic oil in the preset time is calculated according to the pressure change data and the hydraulic oil volume change data, and the method comprises the following steps:

recording a first hydraulic oil volume corresponding to a maximum pressure value in the pressure change data in the hydraulic oil volume change data and a second hydraulic oil volume corresponding to a minimum pressure value in the pressure change data;

calculating the average leakage amount of the hydraulic oil in the preset time according to the following formula:

Q₀＝(V₁-V₂)/T

wherein, T is a preset duration, and the unit is: min; v₁The volume of the first hydraulic oil is as follows: ml; v₂Second hydraulic oil volume, unit: ml; q₀The average leakage, unit: ml/min.

In addition, Q is₀＝(V₁-V₂) The formula V of the volume of the leaked oil liquid is calculated by the method of the invention₁-V₂And formula Q for calculating the leakage of the system₀The preset time length T is 30s, and the calculation time unit is converted into min, namely T is 30 (s)/60.

In this embodiment, the preset formula is a preset fitting relational expression between the leakage amount when the first pressure is decreased to the second pressure and the average leakage amount, the average temperature, and the temperature fluctuation value in the preset time period, and the leakage amount of the hydraulic oil when the hydraulic control system is decreased to the second pressure from the first pressure is calculated according to the temperature change data, the pressure change data, the hydraulic oil volume change data, and the preset formula in the preset time period, including:

calculating the average leakage amount of the hydraulic oil in the preset time according to the pressure change data and the hydraulic oil volume change data, and calculating the average temperature and the temperature fluctuation value in the preset time according to the temperature change data;

and calculating the leakage amount of the hydraulic control system when the first pressure is reduced to the second pressure according to a preset formula.

The preset formula may be formula (1) or formula (2):

Q＝0.0081T²-0.6443T-0.0011Q₀ ²-0.0841Q₀-0.842ΔT+17.341 (2)

wherein, Q is the leakage, unit: ml/min; t, average temperature, unit: DEG C; Δ T, is the temperature fluctuation value in units: DEG C; q₀The average leakage, unit: ml/min.

Fig. 4 is a graph comparing data of the average leak amount and the leak amount corrected using the formula (1) shown in the first embodiment. Fig. 5 is a graph comparing data of the average leak amount and the leak amount corrected using the formula (2) shown in the first embodiment. Referring to fig. 4 and 5, the method of the present embodiment is used to estimate and correct the leakage amount of the hydraulic control system, so as to obtain the leakage amount data of the whole process of reducing the final system pressure from 60bar to 40bar, and compare the leakage amount data with the leakage amount data actually having temperature fluctuation. When the temperature fluctuation exists in the test, the fluctuation of the leakage quantity data is also larger, the fluctuation range is 2.1-3.2ml/min, the leakage quantity range is larger, the judgment of the test result is not facilitated, and after the leakage quantity data tested for 30s is adopted for prediction and temperature correction, the obtained leakage quantity result deviation is smaller, the fluctuation range of the leakage quantity is 2.5-2.8ml/min, the fluctuation range is very close to the data tested when the temperature is constant at 30 ℃ and the fluctuation is smaller (2.5-2.8ml/min), the actual leakage quantity is closer, and the result is more accurate and reliable.

In one embodiment, the preset temperature is 30 ℃, the preset formula is a preset fitting relation between a leakage amount when the first pressure is reduced from 60bar to 40bar and an average leakage amount, a difference between the average temperature and the preset temperature and a temperature fluctuation value within a preset time period of 30s, and the leakage amount of the hydraulic oil when the hydraulic control system is reduced from the first pressure to the second pressure is calculated according to temperature change data, pressure change data, hydraulic oil volume change data and the preset formula within the preset time period, and the method includes:

calculating the average leakage amount of the hydraulic oil in the preset time according to the pressure change data and the hydraulic oil volume change data, and calculating the difference between the average temperature and the preset temperature in the preset time and the temperature fluctuation value according to the temperature change data;

and calculating the leakage amount of the hydraulic control system when the first pressure is reduced to the second pressure according to a preset formula.

The preset formula may be formula (3) or formula (4):

Q＝0.0081T'²-0.1583T'-0.0011Q₀ ²-0.0841Q₀-0.842ΔT+5.302 (4)

wherein, Q is the leakage, unit: ml/min; t' is the difference between the average temperature and the predetermined temperature, in units: DEG C; Δ T, is the temperature fluctuation value in units: DEG C; q₀The average leakage, unit: ml/min.

Second embodiment

The test method provided by the present embodiment is used to fit a preset formula used to calculate the actual leak amount in the first embodiment. The method for testing the hydraulic oil leakage amount of the hydraulic control system further comprises the following steps:

under the preset temperature, obtaining a plurality of groups of leakage quantity-time length curves of a plurality of qualified hydraulic control systems from the first pressure to the second pressure, and recording the average leakage quantity, the average temperature and the temperature fluctuation value corresponding to the leakage quantity-time length curves in the preset time length;

acquiring the hydraulic oil leakage amount corresponding to a leakage amount-time length curve with the temperature fluctuation value smaller than the preset temperature fluctuation value;

and performing curve fitting on the average leakage amount, the average temperature, the temperature fluctuation value and the hydraulic oil leakage amount obtained according to the plurality of leakage amount-time length curves to obtain a preset formula.

Wherein the temperature is set to be constant at 30 ℃, and a complete leakage-duration curve in the testing process is obtained by performing a plurality of complete leakage tests on a plurality of qualified high-pressure hydraulic control system modules, as shown in fig. 6, one leakage-duration curve is provided for each test. Average leakage Q over the first 30s of the statistical test₀And extracting the average temperature T and the temperature fluctuation value delta T in the corresponding data.

In the tests, a data curve with the temperature constant at 30 ℃ and the temperature fluctuation range less than 0.1 ℃ is selected as a standard, and the hydraulic oil leakage quantity Q of the complete leakage quantity test is extracted.

The leakage quantity Q and the average leakage quantity Q of the hydraulic oil₀Carrying out curve fitting on the average temperature T and the temperature fluctuation value delta T through MATLAB to finally obtain the leakage quantity Q of the hydraulic oil and the average leakage quantity Q₀The preset fitting relational expression of the average temperature T and the temperature fluctuation value delta T, namely a preset formula, ensures the data reliability of the leakage amount corrected through temperature change.

Or the leakage quantity Q of the hydraulic oil and the average leakage quantity Q₀Carrying out curve fitting on the difference T' between the average temperature T and the preset temperature (30 ℃) and the temperature fluctuation value delta T through MATLAB to finally obtain the leakage quantity Q and the average leakage quantity Q of the hydraulic oil₀The difference T' between the average temperature T and the preset temperature, and the temperature fluctuation value delta T, namely a preset formula.

Third embodiment

Fig. 7 is a schematic structural diagram of a hydraulic oil leakage test system of a hydraulically controlled system according to a third embodiment. As shown in fig. 7, the hydraulic oil leakage testing system of the hydraulic control system of the present embodiment includes a memory 310 and a processor 320, the memory 310 is used for storing at least one program instruction, and the processor 320 is used for implementing the hydraulic oil leakage testing method of the hydraulic control system according to the first and second embodiments by loading and executing the at least one program instruction.

The hydraulic oil leakage test system of the hydraulic control system of this embodiment includes, but is not limited to, a TCU, and the specific working process of the processor 320 is described in the first embodiment and the second embodiment, and is not described herein again.

The above embodiments are merely illustrative of the principles and utilities of the present application and are not intended to limit the application. Any person skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present application. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed in the present application shall be covered by the claims of the present application.