Development of SATV [Super All Terrain Vehicle] and HMT [Hydro Mechanical Transmission] System

Nagao, Takahisa; Ichiryu, Ken; Masuzawa, Koichi

doi:10.4271/2002-01-1448

Cited by 4 publications

(5 citation statements)

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“…The HMT kinematic characteristic equation is the profile of the hydraulic power ratio P h with respect to the speed ratio v rat , describing the power management of the drivetrain given any v rat . This P h profile was shown previously when Nagao et al 20 designed an SS-HMT for a super all-terrain vehicle, 20 but many of the details such as the equation derivation were not revealed.…”

Section: Introductionmentioning

confidence: 53%

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Optimal design of a power-split hybrid hydraulic bus

Ramdan

Stelson

2016

Proceedings of the Institution of Mechanical Engineers, Part D:

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The hydraulic power-split architecture, or the hydromechanical transmission, can exist in over 1000 configurations. Since a specific hydromechanical transmission configuration has a unique kinematic characteristic, the optimal hydromechanical transmission configuration for one application is different from the optimal hydromechanical transmission configurations for other applications. This study finds the optimal hydromechanical transmission configuration for a hybrid hydraulic city bus. Since a hydromechanical transmission uses at least one planetary gear set, the process of finding a suitable hydromechanical transmission configuration for a hybrid hydraulic city bus is very time consuming, but this study simplifies the procedure by utilizing the critical speed ratio v crit , where v crit is the missing link between the planetary gear set configuration, its gear ratio and its kinematic characteristic. This simplification also allows complex dual-stage hydromechanical transmission architecture configurations to be considered as candidates for the optimal drivetrain of the hybrid hydraulic city bus. The hydromechanical transmission configuration candidates are simulated over three city bus driving cycles and, to ensure that they operate at the optimal conditions for each driving cycle, dynamic programming is used. This study also establishes two power recirculation modes, one of which is useful because of its high efficiency. A single-stage power-split architecture configuration candidate is found to be the optimal drivetrain for a hydromechanical transmission bus.

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Section: Introductionmentioning

confidence: 53%

“…This P h profile was shown previously when Nagao et al 20 designed an SS-HMT for a super all-terrain vehicle, 20 but many of the details such as the equation derivation were not revealed.…”

Section: Introductionmentioning

confidence: 59%

Optimal design of a power-split hybrid hydraulic bus

Ramdan

Stelson

2016

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…In the 21st century, the applications of HMT for military machinery, 59–68 agricultural machinery 11,12,69,70 and construction machinery 71–73 extended to transportation vehicles, sanitation vehicles, and renewable energy machinery. The development of these new applications can be seen in Figure 9.…”

Section: Key Technologies Status and Trendsmentioning

confidence: 99%

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

Cao

Cheng

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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The hydro-mechanical power split transmission is an important form of hydraulic hybrid transmission, combining the stepless speed characteristics of hydraulic transmission and the high efficiency of mechanical transmission. Recently, the hydro-mechanical power split transmission, with its relatively large potential for energy recovery and improving the environment, and its low cost, has attracted many scholars from all over the world. Because there are many types of hydro-mechanical power split transmission, the different forms are complex, and researchers across the world are relatively dispersed, it has experienced a long and arduous development process. Therefore, it is important to summarize the types, developments, and achievements of this transmission. From the recent literature at home and abroad, this paper summarizes developments, key techniques and trends, analyses problems and difficulties in design and application, discusses the methods for solving these problems, and provides references for the development and application of hydro-mechanical power split transmission.

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“…ZF Eccom mainly operates within a range of hydraulic power split ratios of less than 10%, and the average transmission efficiency exceeds 80% [19]. In addition, Caterpillar (USA), Komatsu (Japan), JCB (UK), and Deutz-Fahr (Italy), among others, use HMCVT extensively on bulldozers, loaders, excavators, and other related high-horsepower vehicles [20,21].…”

Section: Introductionmentioning

confidence: 99%

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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Development of SATV [Super All Terrain Vehicle] and HMT [Hydro Mechanical Transmission] System

Cited by 4 publications

References 0 publications

Optimal design of a power-split hybrid hydraulic bus

Optimal design of a power-split hybrid hydraulic bus

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

Configuration of the Power Reflux Hydro-Mechanical Transmission System

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