An improved design of power-cycling hydrodynamic mechanical transmission

Liu, Xiaojun; Sun, Dongye

doi:10.1007/s12206-020-0708-0

Cited by 4 publications

(4 citation statements)

References 24 publications

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“…With the continuous popularization of commercial vehicles in the market and the deepening of consumers' awareness of driving comfort, people pay increasing attention to the overall shift quality of vehicles. Especially in terms of environmental protection and energy savings, the shifting efficiency has become an important aspect that major vehicle transmission manufacturers strive to improve, and then the corresponding assessment of vehicle shift performance is also more detailed and in-depth 24 , 25 . GSA testing technology could quantify the subjective feelings of drivers into objective data, which could guide the formulation of improvement measures.…”

Section: Methodsmentioning

confidence: 99%

Sustainable improvement and evaluation of the shifting smoothness of vehicle transmission

Hu²,

Chen

et al. 2021

Sci Rep

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Energy savings and environmental protection are the only way for the sustainable development of the automotive industry. The poor shifting performance of automobile transmission may reduce the driver's driving pleasure and make the driver feel tired. In addition, improper shifting would also increase fuel consumption. Therefore, in view of the importance of improving the shift performance of vehicle transmission, GSA testing technology was employed for the existing shift quality problems of commercial vehicles to continuously realize high shifting efficiency and low fuel consumption. Through the establishment of subjective and objective evaluation criteria of the experimentally determined shift performance of commercial vehicles, a reliable theoretical basis is provided for product optimization design and shift performance evaluation. As a result, the shift control strategy and optimization matching measures are formulated to ensure that the power, smoothness and transmission of the whole vehicle system meet the technical requirements and finally achieve a rapid and stable gearshift. Thus, this work unveils the high potential of improving the shift performance and quality of the whole vehicle and is expected to have an impact on reducing fuel consumption and emissions in the relevant automotive industry, contributing to the establishment of a more sustainable society.

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Section: Methodsmentioning

confidence: 99%

Sustainable improvement and evaluation of the shifting smoothness of vehicle transmission

Hu²,

Chen

et al. 2021

Sci Rep

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“…Incorporating Equation (22) into Equation ( 21) yields the expression for the torque ratio of S-TQ-J N , as follows:…”

Section: Low-speed Torque Increase Characteristics Of the Phtsmentioning

confidence: 99%

“…However, a thorough review of the literature reveals that, whether in theoretical research or production applications, almost all HMCVTs not only start with hydrostatic transmission, but also include two transmission modes: power split transmission mode and power reflux transmission mode. In the power reflux transmission mode, part of the power input from the power source is output externally, while the rest is stored within the system in the form of reflux power [22]. Affected by the reflux power, the efficiency of the power reflux transmission mode is lower than that of the power split transmission mode, and it has higher strength requirements for transmission components [23].…”

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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“…The evaluation results are related to the driving habits and preferences of the evaluators, which cannot objectively reflect the problems existing in the shifting process of vehicles, so it is difficult to help the designers to find the optimal design solutions. 15 …”

Section: Vehicle Shifting System Testingmentioning

confidence: 99%

Testing and analysis of automotive gearshift performance based on gear shift analysis

Shen¹,

Zhang²,

Chen

et al. 2020

Engineering Reports

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With the increasing demand for vehicle handling comfort in the market, the development of gear shifting performance test systems for automobile transmission has become one of the keys to improving the competitiveness of automobile products. In order to continuously improve the shifting quality of the automobile gearshift control, this research focuses on the study of shifting quality, uses GSA (gear shift analysis) test technology to test and verify the shifting performance of a domestic automobile gearbox, establishes the subjective and objective evaluation criteria for the shifting performance of automobile gearbox, provides a reliable theoretical basis for product optimization design and shifting performance evaluation, and formulates shifting control pertinently. Strategies and optimization measures to ensure that the power, ride, and transmission of the whole vehicle system meet the technical requirements and can shift quickly and smoothly. Not only does this allows to reduce the driver's fatigue strength, but also increases the comfort of the whole shifting process, so as to provide direction to improve the quality of the vehicle's shifting performance and effectively reduce the impact on the driver's health.

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An improved design of power-cycling hydrodynamic mechanical transmission

Cited by 4 publications

References 24 publications

Sustainable improvement and evaluation of the shifting smoothness of vehicle transmission

Sustainable improvement and evaluation of the shifting smoothness of vehicle transmission

Configuration of the Power Reflux Hydro-Mechanical Transmission System

Testing and analysis of automotive gearshift performance based on gear shift analysis

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