Hydro-mechanical power split transmissions: Progress evolution and future trends

Yu, Jin; Cao, Z. Alexander; Cheng, Min; Pan, R Martin Du

doi:10.1177/0954407017749734

Cited by 21 publications

(16 citation statements)

References 28 publications

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“…HMCVT exhibits large transmission power, high transmission efficiency and a wide range of continuously variable transmission. 1,2 This strategy has been widely used in military vehicles. 3,4…”

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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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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“…After the input speed enters the speed-increasing CCHMT through a clutch converter, it is divided into two parts, one part entering the mechanical system of the CCHMT and the other entering the volumetric speed control circuit of the hydraulic system. The output speed of the volumetric speed-control system re-enters the mechanical system through the planetary gear train [26]. The speed regulation ratio of the volumetric speedcontrol circuit of the hydraulic portion can be changed in real time, and the speed ratio of the speed-increasing CCHMT can be changed at any time by strategically changing the open degree.…”

Section: Introduction Of Speed-increasing Cchmtmentioning

confidence: 99%

Novel Design of Speed-increasing Compound Coupled Hydromechanical Transmission on Tidal Current Turbine for Power Generation

et al. 2020

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A key topic discussed in the energy industry has long been how to steadily convert tidal energy into mechanical energy and then electrical power. Gear transmissions are widely used in mechanical systems for electrical power production, converting low-speed input rotation into high-speed output rotation to drive a generator rotor. However, to achieve a large speed ratio and stepless speed change, gear transmissions must be accompanied by complex structures and high-precision manufacturing technology. The application of gear transmissions in tidal energy power generation must therefore come at a high cost. A large speed ratio and stepless speed-changing capability are precisely the two essential elements of the mechanical system for tidal energy power generation. In this paper, a new type of speed-increasing CCHMT has been proposed that is capable of achieving large transmission ratio speed change between the blade rotor input and the generator rotor output. It is also capable of changing the input speed steplessly into a stable output speed suitable for power generation and for high-quality electric power production. To verify the feasibility of using a speed-increasing CCHMT in tidal energy, a simulation model has been established for the wave power at the input end. With the assistance of a volumetric speed-control system and hydraulic accumulator, the speed-increasing CCHMT can stably transmit disordered input speed. Simulation results show that the output rotational speed gained a stable amplification ratio within 20 and 30. The mean square error of the rotational speed was controlled to within 29 and the output speed is limited within 85% to 115% of the average output speed, thus ensuring the quality of power generation.

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“…Hydromechanical power split drivetrain configurations have been widely investigated and implemented in automotive industry to reduce fuel consumption 34–36 . In general, properly designed hydromechanical transmissions proved themselves as reliable systems that perform robustly under sever industrial operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Extremum‐seeking control for energy‐harvesting enhancement of wind turbines with hydromechanical drivetrains

2020

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Efficiency and reliability enhancement of distributed wind energy systems have been the subject of extensive research effort for the purpose of energy cost reduction and power availability. This work investigates the integration of a hydromechanical power split transmission into the drivetrain of a stall-regulated wind turbine with a fixedspeed generator to enhance the overall system efficiency without compromising its reliability. The proposed drivetrain configuration introduces a variable transmission ratio capability, thus enabling the turbine rotor to cope with varying wind speeds independent of the fixed generator speed. An extremum-seeking control approach is adopted to maximize energy harvesting by controlling a variable geometric volume hydraulic pump without the need for wind speed measurement. Compared with a stall-regulated fixed-speed wind turbine, the performance of the proposed wind turbine configuration is evaluated in simulation environment under different wind speed conditions. The results demonstrate the ability of the proposed wind turbine configuration to significantly improve the system overall efficiency in partial and full-load regions of operation. Consequently, the proposed wind turbine configuration with extremum-seeking control can be considered as an efficient and reliable possible alternative for future distributed and isolated wind energy systems. K E Y W O R D S distributed wind turbines, extremum-seeking control, fatigue loading, hydromechanical drivetrain, power splitting, wind turbine efficiency 1 | INTRODUCTION Wind energy represents one of the major renewable energy resources available for sustainable power generation. The installed wind power capacity and the annual wind power generation have grown rapidly worldwide in the last few decades. 1 However, the future growth in wind energy projects is contingent upon the reduction of its cost. Ultimately, the enhancement of both efficiency and reliability of wind energy systems leads to significant reduction in wind power cost and maintains its availability. This objective motivates the implementation of novel wind energy system configurations and the adoption of advanced control algorithms. Based on their electrical configurations, wind energy systems can be classified as either fixed-speed or variable-speed. 2 Basically, stall-regulated fixed-speed wind energy systems are equipped with squirrel-cage induction generators and operate efficiently in the vicinity of a specific wind speed. As the wind speed varies away from that specified value, the efficiency of these systems drops significantly. Stall-regulated fixed-speed configuration represented a viable choice for small and medium-scale wind turbines (i.e., less than 1 MW) due to its low cost and relatively high reliability, 3 especially in distributed and isolated power systems. However, the relatively low efficiency of stall-regulated fixed-speed wind turbines hinders the growth of their installation.

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Hydro-mechanical power split transmissions: Progress evolution and future trends

Cited by 21 publications

References 28 publications

Integrated control strategy of tractor hydromechanical continuously variable transmission

Integrated control strategy of tractor hydromechanical continuously variable transmission

Novel Design of Speed-increasing Compound Coupled Hydromechanical Transmission on Tidal Current Turbine for Power Generation

Extremum‐seeking control for energy‐harvesting enhancement of wind turbines with hydromechanical drivetrains

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