Analysis on the shift strategy of hydro-mechanical infinitely variable transmission based on the orthogonal test

Pan, Daoyuan; Zhu, Zhen; Xiang, Gao; Zhu, Yu; Cao, Leilei

doi:10.1177/1687814016644379

Cited by 7 publications

(8 citation statements)

References 15 publications

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“…Yuan et al 7 and Du et al 8 studied the characteristics of multi-stage transmissions, designing a dual-stage output coupled transmission and a dual-mode hydro-mechanical transmission. Zhu et al 32 and Pan et al 33 also carried out some research on shift strategies, and Zhu 34 looked at structure optimization.…”

Section: Development Of Hydro-mechanical Power Split Transmissionsmentioning

confidence: 99%

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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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Section: Development Of Hydro-mechanical Power Split Transmissionsmentioning

confidence: 99%

“…Pan et al 33 and Zhu et al 50 studied the effects of physical parameters (engine rotating speed, load torque, main circuit pressure, and speed valve flow rate) and shift time on shift quality. Shift time had previously always been ignored, because it played a limited role in a few clutch systems.…”

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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“…15,16 For example, Ahn et al 17 developed a speed control algorithm for the combined regulation of engine and transmission that reduces the fuel consumption of the entire vehicle by 7.5%. Pan et al 18 divided the shift process of HMCVT into four stages on the basis of physical parameters and shift time to study the shift strategy of HMCVT; this division effectively improves shift quality. 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.…”

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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“…In the control of HMT, Savaresi et al [20,21] designed a controller for a six-range power split continuous variable transmission. Zhu et al [22,23] studied the control strategy for a seven-range HMT based on the shifting time. Cheong et al [24,25] studied the control of hydromechanical hydraulic hybrid vehicles.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Power Transition in Full Power Shift of Hydromechanical Transmission

Bao

Zhong

Yang

2020

Mathematical Problems in Engineering

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This paper shall explore the dynamics of power transition in full power shift of hydromechanical transmission (HMT) and focus on the ideal target displacement ratio. An arithmetic two-range HMT is taken as the research object. A mathematical model of power transition in full power shift is established, including the hydraulic transmission unit model and the brake torque model during the double brakes overlapping. Aiming at the constant output power of HMT in the shift process, a prediction model of the displacement ratio target value is established, and the prediction method is proposed. By combining theoretical analysis and experimental research, it proves that the power transition model can describe the power transition process. And the prediction method of the displacement ratio target value proposed in this paper can complete the power transition when the double brakes overlap. In the power shift process, the output power can be transmitted normally in full power. The power transition model and the prediction method of the displacement ratio target value can provide theoretical and engineering references for the full power shift of HMT.

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Analysis on the shift strategy of hydro-mechanical infinitely variable transmission based on the orthogonal test

Cited by 7 publications

References 15 publications

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

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

Integrated control strategy of tractor hydromechanical continuously variable transmission

Modeling of Power Transition in Full Power Shift of Hydromechanical Transmission

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