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Research on HMCVT Efficiency Model Based on the Improved SA Algorithm

机译：基于改进SA算法的HMCVT效率模型研究

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摘要

Research on the efficiency characteristic of the hydromechanical continuous variable transmission (HMCVT) in tractors is key to obtaining optimal transmission, developing control strategies, and assessing efficiency. To ease and improve the accuracy of obtaining the efficiency completely based on testmeasurements or theoretical calculation, this study proposes a method for building the HMCVT efficiency model. The method is based on an improved simulated annealing (SA) algorithm according to a small amount of test data. The study uses 8 groups of transmission efficiency values under different operating conditions obtained from bench tests. By theoretical analysis of the HMCVT, this study divides the total transmission efficiency into (i) the transmission efficiency from the output power of the power source to the confluence mechanism, (ii) the transmission efficiency of the confluence mechanism, and (iii) the transmission efficiency of the output part after confluence. The formulas for the three parts of transmission efficiencies are then derived. This study improves the SA algorithm and uses it to identify the three key parameters of hydraulic systems of the transmission efficiency calculation model. Research results indicate that the efficiency model built using the proposed method exhibits high accuracy with an error of about 1.90%. The improved SA algorithm can rapidly complete key parameter identification with an error of about 2.16%; when the displacement ratio is 0, the efficiency values at the same stage are approximately equal under different operating conditions. The HMCVT efficiency model can be built rapidly and effectively with only five groups of efficiency measurement tests.
机译：对拖拉机中的液压机械无级变速器（HMCVT）的效率特性进行研究是获得最佳变速器，制定控制策略和评估效率的关键。为了缓解和提高完全基于测试方法或理论计算获得效率的准确性，本研究提出了一种建立HMCVT效率模型的方法。该方法基于根据少量测试数据的改进的模拟退火（SA）算法。该研究使用了从基准测试中获得的在不同工作条件下的8组传输效率值。通过对HMCVT的理论分析，本研究将总传输效率分为（i）从电源输出功率到汇合机构的传输效率，（ii）汇合机构的传输效率，以及（iii）汇合后输出部分的传输效率。然后推导了传输效率的三个部分的公式。这项研究改进了SA算法，并用它来识别传动效率计算模型中液压系统的三个关键参数。研究结果表明，使用该方法建立的效率模型具有较高的精度，误差约为1.90％。改进的SA算法可以快速完成关键参数的识别，误差约为2.16％。当排量比为0时，在不同的工作条件下，同一阶段的效率值近似相等。仅需进行五组效率测量测试，即可快速有效地构建HMCVT效率模型。

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