Design and control of a hydro-mechanical transmission for all-terrain vehicle

Wu, Wei; Luo, Junlin; Wei, Chunhui; Liu, Hui; Yuan, Shuai

doi:10.1016/j.mechmachtheory.2020.104052

Cited by 21 publications

(11 citation statements)

References 31 publications

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“…P ls1 = P tm − P tm η g + P tm η g b − P tm η P-M bη g P lc1 = P tm b − P tm η P-M bη g (15) where P tm is the total power input to the mechanical transmission path (kW) and b is the power reflux ratio, defined as the ratio of the reflux power to the total power input to the DGT, where b ∈ [0, 1]. The difference P d1 in power loss between the two basic configurations is…”

Section: Efficiency Comparison Between C-phts and S-phtsmentioning

confidence: 99%

“…The proposed HMCVT presents a mean efficiency of about 83% in a wide speed range [14]. Considering all-terrain vehicles as the research object, Wu et al designed an HMCVT equipped with a single planetary gear, and they used an active disturbance rejection control algorithm with feedforward compensation to regulate the speed ratio, which can control the overshoot of the actual speed ratio at around 3.75% [15].…”

Section: Introductionmentioning

confidence: 99%

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Configuration of the Power Reflux Hydro-Mechanical Transmission System

Wang,

Sun,

Wang

et al. 2024

Actuators

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The hydro-mechanical transmission system (HMTS) operates either in power split transmission mode (PSTM) or power reflux transmission mode (PRTM). Although PRTM is often ignored as a transition mode, this study reveals that the HMTS operating in the PRTM can accumulate the power input from the power source in the form of reflux power (in some references, scholars also refer to the reflux power as circulating power), thereby enabling the HMTS to exhibit a similar transmission performance as hydrodynamic transmission systems. Accordingly, this study applies the PRTM to the starting of construction vehicles and refers to the HMTS operating only in the PRTM as the power reflux hydro-mechanical transmission system (PHTS). By analyzing the internal relationship between the configuration and the power flow, transmission characteristics, energy storage mechanism, and energy loss mechanism of the PHTS, the optimal PHTS configuration suitable for construction vehicles was explored. The results indicate that reasonable configurations can enable the PHTS to significantly improve the efficiency of the construction vehicle transmission system, reducing energy consumption while ensuring power performance. Expanding the displacement ratio control range of the hydraulic speed regulation mechanism and combining the PRTM with the PSTM in an orderly manner can widen the high-efficiency range of the vehicle transmission system without increasing the number of vehicle gears.

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Section: Efficiency Comparison Between C-phts and S-phtsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Configuration of the Power Reflux Hydro-Mechanical Transmission System

Wang,

Sun,

Wang

et al. 2024

Actuators

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“…For this reason, the choice of layout among the many possible ones as well as the sizing and management of the transmission are of crucial importance. These three aspects have been addressed in research since the 1960s: simple configurations, known as Input Coupled (IC) and Output Coupled (OC) [4][5][6][7][8][9], and complex configurations characterized by multiple planetary or by additional gears [10][11][12][13][14][15]. In [16], thanks to an analytical formulation of the transmission layout, the optimization process searches for the best layout among the many possible ones and simultaneously the optimal sizes of the components.…”

Section: Introductionmentioning

confidence: 99%

Hydromechanical Transmission IC2OC: Component Sizing and Optimization

Andretta,

Rossetti,

Macor

2024

Fluids

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The IC2OC transmission is a continuous transmission whose layout can change from simple IC to simple OC configuration and vice versa. It was proposed to cover a wider range of vehicle speeds without adding gears. Its sizing can lead to higher efficiencies than those of the IC and OC layouts. Therefore, this work deals with the sizing methodologies of this transmission. Two methodologies are proposed and discussed: the first uses the functional and constitutive equations of the transmission; the second is based on a mathematical programming problem. Both methodologies start from the choice of the full mechanical point speeds. The comparison between the two methods is carried out on the transmission of a commercially available 230 kW reach stacker. The comparison shows that the functional method, leaner and faster, can provide results very close to those obtained with the heavy and time-consuming optimization, provided that the values of the two full mechanical point speeds are the optimal ones for the two basic transmissions taken individually.

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“…4 For example, hydraulic pump is usually applied in the continuously variable transmission system of off-road vehicles. 5 The speed of hydraulic pump used in aerospace can attain 20,000 r/min. 6 The energy losses of hydraulic pump mainly include volumetric efficiency losses, mechanical efficiency losses, and churning losses.…”

Section: Introductionmentioning

confidence: 99%

Analysis of churning losses distribution of hydraulic pump in engineering vehicles using MPS method

Wei

Gui³

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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The power losses of the hydraulic pump in engineering vehicle include mechanical losses, churning losses, and volume losses. The proportion of churning losses to power losses increases markedly, with the continuous improvement of the rotating speed of the hydraulic pump. The churning losses of the hydraulic pump are calculated by moving particle semi-implicit (MPS) method. It indicates that the inclination angle, speed, and oil content will significantly influence the churning losses. The churning torque and power losses of each rotating part increase with the pump speed. The churning losses of the cylinder block are the largest, followed by the retainer and slippers. The churning losses of pistons and shaft are small. With the decrease of oil volume, the churning losses decrease. With the decrease of the inclined angle of the swashplate, the total churning losses decreases. When the oil content is 70% of the full oil, the churning losses of the hydraulic pump is reduced by 57.4%. It provides guidance for the design of the hydraulic pump of high-power density for engineering vehicles and a new numerical calculation method for churning losses of the hydraulic pump.

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Design and control of a hydro-mechanical transmission for all-terrain vehicle

Cited by 21 publications

References 31 publications

Configuration of the Power Reflux Hydro-Mechanical Transmission System

Configuration of the Power Reflux Hydro-Mechanical Transmission System

Hydromechanical Transmission IC2OC: Component Sizing and Optimization

Analysis of churning losses distribution of hydraulic pump in engineering vehicles using MPS method

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