A comprehensive evaluation method for transmission efficiency performance of hydraulic mechanical integrated transmission device

Abstract

The present invention discloses a method for comprehensively evaluating the transmission efficiency performance of a hydraulic machinery integrated transmission device, and relates to the technical field of hydraulic machinery performance / quality evaluation. Starting from system-level research, the method obtains the upper and lower intervals of the transmission efficiency performance evaluation based on the statistics of transmission efficiency values ​​under multiple samples and multiple working conditions. Considering the numerical size and directionality of the upper and lower interval vectors of the multi-working condition efficiency data, the position of the sample to be tested in the interval is measured using the morphological similarity distance, and a normalized transmission efficiency performance evaluation index is constructed through the distance ratio. The present invention realizes the comprehensive correlation evaluation of single sample multi-working condition data, and constructs a normalized transmission performance evaluation index, so that the problem that the transmission efficiency performance of the hydraulic machinery integrated transmission device cannot be quantitatively evaluated due to the different advantages and disadvantages of each working condition is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic machinery performance / quality evaluation, and in particular to a method for comprehensively evaluating the transmission efficiency performance of a hydraulic machinery integrated transmission device. Background Art

[0002] The hydraulic-mechanical integrated transmission device is a complex mechanical transmission device, which consists of a front transmission end, a planetary speed change mechanism, a hydraulic torque converter, and busbars on both sides. Power losses mainly include oil stirring losses of rotating parts, friction losses of gear transmissions, and power losses of the lubrication system. When testing the transmission efficiency of the device, multiple gears and typical test speeds under each gear are involved, and it is affected by uncertain factors such as temperature and the height of the liquid level inside the box. Therefore, it is impossible to use data under a single test condition (determined speed, gear, loading degree, etc.) to illustrate the overall transmission efficiency performance. It is difficult to obtain a concise and direct evaluation using test data from all conditions. In order to accurately evaluate the efficiency transmission performance of the hydraulic-mechanical integrated transmission device, it is necessary to study relevant methods.

[0003] The existing technical solutions have not found a comprehensive evaluation method for the transmission efficiency of complex mechanical transmission devices under multi-gear and multi-speed conditions. If a simple weighted sum calculation method is used for each working condition, it is impossible to reflect the state of the transmission efficiency of the sample under investigation deviating from the overall state of multiple samples, and it is difficult to achieve the purpose of promoting continuous quality improvement through evaluation. Summary of the invention

[0004] In view of this, the present invention provides a comprehensive evaluation method for the transmission efficiency performance of a hydraulic mechanical integrated transmission device, which can solve the problem that the transmission efficiency performance of the hydraulic mechanical integrated transmission device cannot be quantitatively evaluated due to the different good and bad states of various working conditions.

[0005] To achieve the above object, the technical solution of the present invention comprises the following steps:

[0006] Step (1) classifies the working modes of the hydraulic mechanical integrated transmission device, and clarifies the working condition parameters of the object to be evaluated: gear position, speed, loading degree and temperature parameters, and obtains the transmission efficiency sample values ​​under various working conditions through experiments.

[0007] Step (2) performs non-parametric statistics on the transmission efficiency sample values ​​under each working condition to obtain the mean μ and standard deviation σ of the transmission efficiency sample values, specifies the operating performance evaluation interval [μ-3σ, μ+3σ], and calculates the morphological similarity distance D between the upper and lower intervals.

[0008] Step (3) combines the transmission efficiency sample values ​​under each working condition into a sample vector, and calculates the morphological similarity distance d1 between the sample vector and the sample vector in the lower interval.

[0009] Step (4) obtains the transmission performance evaluation index by the ratio of d1 to D, that is, the transmission performance evaluation index is PQ=d1 / D, and the transmission efficiency performance of the hydraulic mechanical integrated transmission device is evaluated according to the transmission performance evaluation index PQ.

[0010] Furthermore, the working modes include straight driving, reverse driving and turning.

[0011] Furthermore, the operating performance evaluation interval [μ-3σ, μ+3σ] is specified, and the morphological similarity distance D between the upper and lower intervals is calculated, specifically: where μ-3σ is the upper interval, and μ+3σ is the lower interval.

[0012] Furthermore, take n operating points l in the upper interval i1 ~l in , forming the upper interval vector L i =(l i1 ,l i2 ,…,l in ), take n operating points l in the interval j1 ~l jn , forming the lower interval vector L j =(l j1 ,l j2 ,…,l jn ); then the morphological similarity distance of the upper and lower interval vectors is:

[0013] D=D Euclid ×(2-ASD / D Manhattan )

[0014] Where D Euclid is the vector L i and L j The Euler distance, D Manhattan is the vector L i and L j Manhattan distance, ASD represents the vector L i and L j The absolute value of the sum of the differences of the components in .

[0015] Furthermore, the transmission efficiency performance of the hydraulic mechanical integrated transmission device is evaluated according to the transmission performance evaluation index PQ, specifically:

[0016] For the hydraulic-mechanical integrated transmission device to be evaluated, its transmission efficiency value under each working condition is calculated, and the transmission performance evaluation index PQ is calculated. If the value of PQ exceeds 0.58, the transmission efficiency performance of the hydraulic-mechanical integrated transmission device is excellent. If the value of PQ is in the range of [0.53, 0.58], the transmission efficiency performance of the hydraulic-mechanical integrated transmission device is good. If the value of PQ is in the range of [0.45, 0.53], the transmission efficiency performance of the hydraulic-mechanical integrated transmission device is medium. If the value of PQ is lower than 0.45, the transmission efficiency performance of the hydraulic-mechanical integrated transmission device is poor.

[0017] Beneficial effects:

[0018] 1. The hydraulic-mechanical integrated transmission device belongs to a complex mechanical transmission device. Starting from the system-level research, this method obtains the upper and lower intervals of the transmission efficiency performance evaluation based on the transmission efficiency value statistics under multiple samples and multiple working conditions. Considering the numerical size and directionality of the upper and lower interval vectors of the multi-working condition efficiency data, the position of the sample to be tested in the interval is measured using the morphological similarity distance, and a normalized transmission efficiency performance evaluation index is constructed through the distance ratio. The present invention realizes the comprehensive correlation evaluation of single-sample multi-working condition data, constructs a normalized transmission performance evaluation index, and solves the problem that the hydraulic-mechanical integrated transmission device cannot quantitatively evaluate its transmission efficiency performance due to the different advantages and disadvantages of each working condition.

[0019] 2. The method provided by the present invention, which combines Euler distance with Manhattan distance, can take into account the metric distance of shape and size, so that the deviation between the overall transmission efficiency of a single hydraulic mechanical integrated transmission device sample and multiple samples can be quantitatively evaluated, while realizing transmission efficiency performance evaluation and quality status assessment, which is beneficial to the comprehensive management and control of product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a flow chart of comprehensive evaluation of transmission efficiency performance of a hydraulic mechanical integrated transmission device in an embodiment of the present invention;

[0021] Figure 2 The radar diagram of the transmission efficiency of the sample to be tested and 74 samples of the same batch under various working conditions and the measurement interval structure diagram of the hydraulic mechanical integrated transmission device in the embodiment of the present invention are shown in FIG.

[0022] Figure 3 Transmission performance evaluation index diagram of each sample under the total speed measurement number. DETAILED DESCRIPTION

[0023] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0024] The present invention discloses a method for comprehensively evaluating the transmission efficiency performance of a hydraulic mechanical integrated transmission device, and belongs to the technical field of performance / quality evaluation. Figure 1 As shown, the specific steps are as follows:

[0025] (1) Classify the working modes of the hydraulic mechanical integrated transmission device, and clarify the gear position, speed, loading degree and temperature parameters of the object to be evaluated, and obtain the transmission efficiency under various working conditions through experiments;

[0026] (2) Perform non-parametric statistics on the transmission efficiency sample values ​​under each working condition to obtain the mean μ and standard deviation σ of the samples under each test, specify the operating performance evaluation interval [μ-3σ,μ+3σ], and calculate the morphological similarity distance D between the upper and lower intervals.

[0027] The morphological similarity distance can consider the size and shape similarity between the metric vectors, such as Figure 2 The volatility of the upper and lower ranges. Define the vector L i =(l i1 ,l i2 ,…,l in ) and L j =(l j1 ,l j2 ,…,l jn ) is:

[0028] D=D Euclid ×(2-ASD / D Manhattan )

[0029] Where D Euclid is the vector L i and L j The Euler distance, D Manhattan is the vector L i and L j Manhattan distance, ASD represents the absolute value of the sum of the differences of each component in the vector. Thus, we get

[0030]

[0031] (3) Specify a vector composed of the sample to be tested and its transfer efficiency values ​​under multiple working conditions, and calculate the morphological similarity distance d1 between the sample vector and the sample vector in the lower interval;

[0032] (4) The transmission performance evaluation index is obtained by the ratio of d1 to D, that is, PQ = d1 / D.

[0033] Figure 2 Radar chart of transmission efficiency and measurement interval construction of the tested sample and 74 samples of the same batch of a certain type of hydraulic mechanical integrated transmission device under various working conditions.

[0034] The upper and lower limits of the transmission efficiency of the hydraulic mechanical integrated transmission device under various working conditions are defined as [μ-3σ, μ+3]σ, and the distance is equal to D. The distance between the sample to be evaluated and the lower limit is d1, so the operating performance evaluation index of the sample to be evaluated is defined as:

[0035] PQ=d1 / D

[0036] Taking a certain type of hydraulic mechanical integrated transmission device as an example, under the specified loading condition, there are six forward gears, namely F1-F6; two reverse gears, namely R1 and R2; one left and one right center steering gear, namely PT1 and PT2. Four test speed points are set in the F1-F6 and R1-R2 gears, namely 1600, 1800, 2000 and 2200rpm; two test speeds are set in the steering gear, namely 1500 and 2200rpm; there are 75 test samples at each gear and each speed, as shown in Table 1.

[0037] Table 1 Test design under specified loading conditions

[0038]

[0039] Set the test order of the sample conditions to be tested as follows:

[0040] (1)F1-1600→F2-1600→F3-1600→F4-1600→F5-1600→F6-1600→R1-1600→R2-1600→PT1-1500→PT2-1500→

[0041] (2)F1-1800→F2-1800→F3-1800→F4-1800→F5-1800→F6-1800→R1-1800→R2-1800→PT1-2200→PT2-2200→

[0042] (3)F1-2000→F2-2000→F3-2000→F4-2000→F5-2000→F6-2000→R1-2000→R2-2000→

[0043] (4)F1-2200→F2-2200→F3-2200→F4-2200→F5-2200→F6-2200→R1-2200→R2-2200→

[0044] First, the transmission performance index of the transmission efficiency mean under each working condition is calculated, and each performance index is arranged from small to large, and fitted using Weibull distribution. The quantiles 0.45, 0.53 and 0.58 corresponding to the probability values ​​0.1, 0.5 and 0.9 in the Weibull distribution are used as the thresholds for judging excellent, good, medium and poor performance, and then judging whether the transmission efficiency performance of the hydraulic mechanical comprehensive transmission device is qualified. The results are as follows Figure 3 shown.

[0045] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for comprehensively evaluating the transmission efficiency performance of a hydraulic mechanical integrated transmission device, characterized in that: The steps include: Step (1) classifying the working modes of the hydraulic mechanical integrated transmission device, and clarifying the working condition parameters of the object to be evaluated: gear position, speed, loading degree and temperature parameters, and obtaining the transmission efficiency sample values ​​under various working conditions through experiments; Step (2) performing non-parametric statistics on the transmission efficiency sample values ​​under each working condition to obtain the mean μ and standard deviation σ of the transmission efficiency sample values, specifying the operating performance evaluation interval [μ-3σ, μ+3σ], and calculating the morphological similarity distance D between the upper and lower intervals; Step (3) The transmission efficiency sample values ​​under each working condition are combined into a sample vector, and the morphological similarity distance d1 between the sample vector and the sample vector in the lower interval is calculated; Step (4) obtains the transmission performance evaluation index by the ratio of d1 to D, that is, the transmission performance evaluation index is PQ=d1 / D, and the transmission efficiency performance of the hydraulic mechanical integrated transmission device is evaluated according to the transmission performance evaluation index PQ.

2. A method for comprehensively evaluating the transmission efficiency performance of a hydraulic mechanical integrated transmission device according to claim 1, characterized in that: The working modes include straight driving, reverse driving and turning driving.

3. A method for comprehensively evaluating the transmission efficiency performance of a hydraulic mechanical integrated transmission device according to claim 1, characterized in that: The specified running performance evaluation interval is [μ-3σ, μ+3σ], and the morphological similarity distance D between the upper and lower intervals is calculated, specifically: Among them, μ-3σ is the upper interval, and μ+3σ is the lower interval.

4. A method for comprehensively evaluating the transmission efficiency performance of a hydraulic mechanical integrated transmission device as claimed in claim 3, characterized in that: Take n operating points l in the upper interval i1 ~l in , forming the upper interval vector L i =(l i1 ,l i2 ,…,l in ), take n operating points l in the interval j1 ~l jn , forming the lower interval vector L j =(l j1 ,l j2 ,…,l jn ); then the morphological similarity distance of the upper and lower interval vectors is: D=D Euclid ×(2-ASD / D Manhattan ) Where D Euclid is the vector L i and L j The Euler distance, D Manhattan is the vector L i and L j Manhattan distance, ASD represents the vector L i and L j The absolute value of the sum of the differences of the components in .

5. A method for comprehensively evaluating the transmission efficiency of a hydraulic mechanical integrated transmission device as claimed in claim 1, characterized in that: The transmission efficiency performance of the hydraulic mechanical integrated transmission device is evaluated according to the transmission performance evaluation index PQ, specifically: For the hydraulic-mechanical integrated transmission device to be evaluated, its transmission efficiency value under each working condition is calculated, and the transmission performance evaluation index PQ is calculated. If the value of PQ exceeds 0.58, the transmission efficiency performance of the hydraulic-mechanical integrated transmission device is excellent; if the value of PQ is in the range of (0.53, 0.58], the transmission efficiency performance of the hydraulic-mechanical integrated transmission device is good; if the value of PQ is in the range of [0.45, 0.53], the transmission efficiency performance of the hydraulic-mechanical integrated transmission device is medium; if the value of PQ is lower than 0.45, the transmission efficiency performance of the hydraulic-mechanical integrated transmission device is poor.

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