A new non-geometric transmission parameter optimization design method for HMCVT based on improved GA and maximum transmission efficiency

Cheng, Zhun; Lu, Zhixiong; Jin, Qian

doi:10.1016/j.compag.2019.105034

Cited by 28 publications

(25 citation statements)

References 11 publications

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“…For a power variable transmission unit, the adjustable speed transmission characteristic is important to the core performance [30][31][32]. To compare and verify the consistency between the theoretical and actual adjustable speed transmission characteristics of the researched and designed HST system, the paper uses the HST variable speed control test bench of the tractor to measure the actual adjustable speed transmission characteristics.…”

Section: Comparative Verification Of the Tractor Hst Adjustable Speed Transmission Characteristicsmentioning

confidence: 99%

Research on Load Disturbance Based Variable Speed PID Control and a Novel Denoising Method Based Effect Evaluation of HST for Agricultural Machinery

Cheng

2021

Agriculture

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This paper aims to realize and improve the constant speed control performance of tractors with HST (Hydrostatic Transmission) variable speed units. To achieve this, based on the HST test bench of the tractor, we perform a verification test of the adjustable speed characteristics, a denoising filter test of the response signal, a test on the influence of the load disturbance on the adjustable speed characteristics and a PID-based constant speed performance detection test. The results of the verification test of the adjustable speed characteristics show that the theoretical value and actual value of the adjustable speed transmission characteristics of the HST used are essentially consistent with each other. The results of the test of the load disturbance’s influence on the adjustable speed characteristics show that the increase in load torque inhibits the HST output response. Therefore, the paper proposes and designs a PID-based closed-loop constant speed control system. The paper uses a step response test and a load disturbance test to research the control result of the constant speed system. Collecting and analyzing all test results, we find that the constant speed control based on PID has a very good result. The average error between the average HST output speed and the target speed set was 0.37%, and the average standard deviation of output speed was 1.18 rpm. In addition, the paper proposes a denoising method combing the empirical mode decomposition method and the Gaussian distribution determination. The method shows that the first two orders of the components of the HST response signal should be removed as noise. The paper uses the denoised signal and the partial least squares method to analyze the influencing factors of the constant speed control result. The analysis results show that the rate of change of load torque has the biggest influence on the stability of HST output speed, followed by the target value.

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Section: Comparative Verification Of the Tractor Hst Adjustable Speed Transmission Characteristicsmentioning

confidence: 99%

Research on Load Disturbance Based Variable Speed PID Control and a Novel Denoising Method Based Effect Evaluation of HST for Agricultural Machinery

Cheng

2021

Agriculture

Self Cite

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“…Xiao et al [19,20] studied the dynamic characteristics of the hydraulic circuit in HMCVT, and a fast system identification method was proposed. Cheng et al [21][22][23][24][25][26] improved the genetic algorithm to implement the HMCVT parameter optimization, and the new proposed model can improve the HMCVT transmission efficiently and flexibly.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristic Analysis and Clutch Engagement Test of HMCVT in the High‐Power Tractor

Chen

Qian

et al. 2021

Complexity

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Hydromechanical continuously variable transmission (HMCVT) is capable of bearing large torque and has wide transmission range, which is suitable for high-power tractors. Dynamic characteristics could influence the tractor life, especially in a high-power tractor. Wet clutch is the crucial component in the HMCVT, which could smooth and soft power transmission. Therefore, it is important to study the dynamic characteristics and implement the wet clutch test of HMCVT. In this paper, AMESim is used to establish virtual models of gearbox, pump-controlled hydraulic motor system, and shifting hydraulic system. Then, a simulation study of tractor operation under working condition is carried out. The internal and external meshing forces of the planetary row are analyzed. Finally, the wet clutch engagement process of HMCVT in the high-power tractor is tested to verify the oil pressure. The simulation results show that the values of internal and external meshing force become larger as the throttle opening increases. At the moment of shifting change, the meshing forces of the planetary gear have great impact. The clutch test shows that the trend of the oil filling curve obtained from the bench test is similar to that obtained from the theoretical curve, which verifies the simulation results.

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“…30,31 Rossetti et al 32 utilized a bus equipped with HMCVT as the research object and introduced a variable speed control strategy that can reduce the energy consumption and emission level of traditional transmission system. Cheng et al 33 proposed an HMCVT transmission parameter optimization method based on factors such as operation requirements of the tractor, maximization of working efficiency, which can significantly improve working efficiency.…”

Section: Introductionmentioning

confidence: 99%

Speed regulation control of tractors’ new dual-flow transmission system based on slip rate resistance classification

Xia

Yan

Tang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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Fluctuations in operation resistance during the operating process lead to reduced efficiency in tractor production. To address this problem, the project team independently developed and designed a new type of hydraulic mechanical continuously variable transmission (HMCVT). Based on introducing the mechanical structure and transmission principle of the HMCVT system, the priority of slip rate control and vehicle speed control is determined by classifying the slip rate. In the process of vehicle speed control, the driving mode of HMCVT system suitable for the current resistance state is determined by classifying the operation resistance. The speed change rule under HMT and HST modes is formulated with the goal of the highest production efficiency, and the displacement ratio adjustment surfaces under HMT and HST modes are determined. A sliding mode control algorithm based on feedforward compensation is proposed to address the problem that the oil pressure fluctuation has influences on the adjustment accuracy of hydraulic pump displacement. The simulation results of Simulink show that this algorithm can not only accurately follow the expected signal changes, but has better tracking stability than traditional PID control algorithm. The HMCVT system and speed control strategy models were built, and simulation results show that the speed control strategy can restrict the slip rate of driving wheels within the allowable range when load or road conditions change. When the tractor speed is lower than the lower limit of the high-efficiency speed range, the speed change law formulated in this paper can improve the tractor speed faster than the traditional rule, and effectively ensure the production efficiency. The research results are of great significance for improving tractor’s adaptability to complex and changeable working environment and promoting agricultural production efficiency.

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A new non-geometric transmission parameter optimization design method for HMCVT based on improved GA and maximum transmission efficiency

Cited by 28 publications

References 11 publications

Research on Load Disturbance Based Variable Speed PID Control and a Novel Denoising Method Based Effect Evaluation of HST for Agricultural Machinery

Research on Load Disturbance Based Variable Speed PID Control and a Novel Denoising Method Based Effect Evaluation of HST for Agricultural Machinery

Dynamic Characteristic Analysis and Clutch Engagement Test of HMCVT in the High‐Power Tractor

Speed regulation control of tractors’ new dual-flow transmission system based on slip rate resistance classification

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