Research on Efficient-Type Shifting Strategy of Construction Machinery with Hydro-Mechanical Transmission System

Tao, Yu; Yan, Qing; Wei, Wei

doi:10.4028/www.scientific.net/amm.66-68.1055

Cited by 3 publications

(4 citation statements)

References 4 publications

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“…As for the new structure of hydro-mechanical transmission, the hydro-mechanical power split transmission which can combine the hydrodynamic drive and mechanical drive together was carried out to improve the efficiency of hydro-mechanical transmission, and further research works on improving the efficiency of hydro-mechanical transmission have been based on this specific structure, such as the match between the engine and the transmission 15 and the design of the shifting schedule. 16,17 Although the efficiency of hydro-mechanical power split transmission has been improved compared with TC, the starting torque ratio would decline dramatically.…”

Section: Introductionmentioning

confidence: 99%

Optimal parameters design method for power reflux hydro-mechanical transmission system

Zhang

Sun

Qin

2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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To ensure the starting torque ratio while improving the efficiency of the automatic transmission system, a power reflux hydro-mechanical transmission system which consists of a torque converter, a planetary gear, and two gearboxes is proposed. First, the properties of the speed ratio, torque ratio, efficiency, and capacity in the power reflux hydro-mechanical transmission system are modeled. Then, the non-dominated sorting genetic algorithm II is used to optimize the structural parameter of the planetary gear and the speed ratio of the gearbox T1, with the speed ratio width in the high-efficiency area, efficiency, and power performance acting as target functions. Moreover, the method of selecting the specific torque converter for the power reflux hydro-mechanical transmission system is proposed. Results show that the starting torque ratio of the power reflux hydro-mechanical transmission system increases to 4.87 and the equivalent efficiency in high-efficiency area of the power reflux hydro-mechanical transmission system reaches to 90.87%. Therefore, the power reflux hydro-mechanical transmission system can reach higher efficiency while ensuring the starting torque ratio compared with hydro-mechanical power split transmission, which can significantly reduce fuel consumption once applied to the construction vehicle.

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Section: Introductionmentioning

confidence: 99%

Optimal parameters design method for power reflux hydro-mechanical transmission system

Zhang

Sun

Qin

2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…22,23 The authors divided the shift process of HMCVT into four stages and this division effectively improves shift quality. 24–26 An improved simulated annealing algorithm was put forward, which serves as a great foundation for laying down control strategies, assessing efficiency and acquiring optimal transmission. 27,28 Zhang et al 29 formulated a dynamic three-parameter range shifting law including the throttle degree, vehicle speed and driving resistance.…”

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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“…Cheng et al 19 proposed a control system, used different control strategies for various objects for simulation and experimentation, and proposed an effective multi-level speed regulation strategy. Yu et al 20 developed a shift control strategy to improve the transmission efficiency of HMCVT. Xiao et al 11 established the economic speed regulation control law on the basis of the engine operation curve and transmission system efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…Constant tractor working speed is the premise for ensuring working quality. The research on speed control for HMCVT in literature 16–24 used economy, power or shift quality as the speed control goal and did not establish the corresponding speed control strategy in accordance with the change in working resistance during the operation of the tractor to ensure constant speed to the maximum extent.…”

Section: Introductionmentioning

confidence: 99%

Integrated control strategy of tractor hydromechanical continuously variable transmission

Xia

Zong

Tang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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Given the transmission efficiency fluctuation and response lag problem of hydromechanical continuous variable transmission combined with the complex and variable working environment of a tractor, an integrated control strategy of engine throttle compensation–hydromechanical continuous variable transmission speed regulation is adopted for dual-flow transmission control. On the basis of the estimation of working resistance, a fuzzy algorithm is used to design the throttle compensation law. Considering the maximum driving power of a tractor as the target of variable speed control, an hydromechanical continuous variable transmission efficiency model is established, and the control law of an hydromechanical continuous variable transmission displacement ratio with the maximum driving power of the tractor under any working condition is determined. On the basis of the wavelet neural network proportional–integral–derivative algorithm, the control law of the hydromechanical continuous variable transmission speed regulation is designed, and the parameters of proportional–integral–derivative control are corrected in real time during the control process. Based on MATLAB/Simulink modelling and simulation and the real vehicle verification test, results showed that the influence of hydromechanical continuous variable transmission efficiency fluctuation on the driving power of the entire vehicle, the response lag of the pump-controlled motor system, and the effect of the leakage on the variable speed control and the fluctuation of the working resistance are solved by studying the hydromechanical continuous variable transmission variable speed transmission control strategy. This strategy improves the stability of the tractor speed and ensured the quality of the work, thereby improving the ability of the tractor to adapt to complex working environments.

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Research on Efficient-Type Shifting Strategy of Construction Machinery with Hydro-Mechanical Transmission System

Cited by 3 publications

References 4 publications

Optimal parameters design method for power reflux hydro-mechanical transmission system

Optimal parameters design method for power reflux hydro-mechanical transmission system

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

Integrated control strategy of tractor hydromechanical continuously variable transmission

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