A Torque Conversion Solution to the Powertrain of Mobile Machine and Its Control Strategy

Wang, Feng; Hong, Junyi; Ding, Ruqi; Xu, Bing; Fiebig, Wiesław

doi:10.1109/tvt.2022.3187593

Cited by 5 publications

(2 citation statements)

References 41 publications

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“…The wheel loader is considered one of the most widely used construction machinery, extensively used in the fields of engineering construction and material transportation [1]. To meet the working requirements of high torque and heavy loads, hydraulic machinery is commonly used as the driving method, such as the traditional automatic transmission drive mode with the hydraulic torque converter as the key component, which is widely used in existing loader drives [2].…”

Section: Introductionmentioning

confidence: 99%

Design and Control Performance Optimization of Variable Structure Hydrostatic Drive Systems for Wheel Loaders

Wang,

Wang

et al. 2024

Machines

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The traditional loader drive system is based on the hydraulic torque converter as the key component, and its gear is shifted through the coordination of the clutch and gearbox, which greatly increases power loss and operator fatigue. To address the above problem, a variable-structure hydrostatic drive system is proposed. This system adopts a closed-loop design and adjusts the displacement of the pump and dual motors to follow the throttle opening of the vehicle, achieving automatic gear shifting and smooth speed regulation. It can also automatically change the system structure according to the vehicle’s speed, meeting the vehicle’s demand for rapid switching output of high torque and high speed. At the same time, in the displacement matching control process, an adaptive sliding mode control scheme based on radial basis function neural network compensation is proposed. This scheme designs an adaptive hyperparameter update strategy according to the characteristics of the system to effectively compensate for changes in uncertain factors. Experimental results show that, compared to traditional drive systems, this system has the characteristics of simple operation, smooth speed regulation, and high fuel economy.

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Section: Introductionmentioning

confidence: 99%

Design and Control Performance Optimization of Variable Structure Hydrostatic Drive Systems for Wheel Loaders

Wang,

Wang

et al. 2024

Machines

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“…Wang et al designed a power split hydraulic torque converter to replace the traditional torque converter on a wheel loader and decoupled the engine and vehicle speeds by controlling the output pressure of the hydraulic torque. Furthermore, with the extra control freedom, energy management strategies were introduced to allow the engine to work in its high-efficiency area [15]. Hippalgaonkar et al connected a hydraulic pump in parallel with an engine, and an accumulator was added to absorb the extra engine power and assist the engine drive, thus improving the fuel economy of the engine [8].…”

Section: Introductionmentioning

confidence: 99%

An Energy-Efficient Adaptive Speed-Regulating Method for Pump-Controlled Motor Hydrostatic Drive Powertrains

Wang,

Zhang,

et al. 2023

Processes

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In this paper, a closed hydrostatic drive powertrain (HSDP) composed of an engine, a variable pump, a variable motor, and an energy-efficient adaptive speed-regulating controller (ADC) based on power following is proposed and investigated. The controller can more than guarantee accurate regulation of motor speed through online efficiency estimation based on established loss models of the pump and the motor. It also facilitates the optimal efficiency control of the engine and hydrostatic system through two redundant control freedoms of the HSDP system, making an energy-saving adjustment of the motor speed. At the same time, the controller can prevent engine overload stall and high system pressure by limiting the displacement of the pumps and motors in real time based on the system loads to improve the automatic adaptability of the system to varying loads. Field testing experiments performed by means of a heavy transportation vehicle under different conditions were conducted to verify the efficacy of the proposed controller. The results showed that the average errors of motor speed were 3.3% under empty load conditions and 9.6% under heavy load conditions. In terms of energy saving, comparison tests involving a rule-based controller (RBC) and the ADC were carried out, and the results showed that the energy-saving ratio of the ADC was at least 11.5% and up to 25.8% under empty load conditions and at least 2.8% and up to 9% under heavy load conditions. The ADC controller showed good performance in terms of speed control, load adaptability, and energy saving and a superior advantage due to its simple structure and ease of implementation. Therefore, the proposed controller is an excellent choice for the real-time control of machinery with an HSDP system, especially heavy-duty machinery.

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A compact hydro-mechanical transmission solution to wheel loader propulsion system and its control strategy

Wang,

Lin,

Zhang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part D:

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Given the need for high efficiency to wheel loader powertrain, hydro-mechanical transmission is a promising solution to wheel loader propulsion system since it enables efficient engine operations owing to its continuously variable transmission function. The current hydro-mechanical transmission consists of planetary gear set and two hydrostatic units, making it bulky and complex in controls. This study proposes a simple and compact hydro-mechanical transmission solution to wheel loader powertrain. It improves vehicle acceleration performance by providing hydraulic torque assistance at low vehicle speed. The steady-state characteristics of the proposed hydro-mechanical transmission are analyzed, and the mathematical models of proposed wheel loader powertrain are constructed. An optimization strategy is developed as a reference for the design of an engine-speed based control strategy. The simulation results of the key components of proposed powertrain are analyzed. Furthermore, the engine-speed based control strategy is evaluated by the optimization strategy in different forms of the loading cycles. The results demonstrate the effectiveness of proposed wheel loader powertrain and its control strategy.

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A Torque Conversion Solution to the Powertrain of Mobile Machine and Its Control Strategy

Cited by 5 publications

References 41 publications

Design and Control Performance Optimization of Variable Structure Hydrostatic Drive Systems for Wheel Loaders

Design and Control Performance Optimization of Variable Structure Hydrostatic Drive Systems for Wheel Loaders

An Energy-Efficient Adaptive Speed-Regulating Method for Pump-Controlled Motor Hydrostatic Drive Powertrains

A compact hydro-mechanical transmission solution to wheel loader propulsion system and its control strategy

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