An Investigation in Performance of a Variable-Speed-Displacement Pump-Controlled Motor System

The electro-hydraulic hybrid cutterhead driving system is a newly developed innovative cutterhead driving system of tunnel boring machine. Regulating the cutterhead rotational speed, balancing the driving load and the torque control of the hydraulic motors are three essential issues of the electro-hydraulic hybrid cutterhead driving system to be addressed. The conventional synchronization method focuses on pure rotational speed regulation only and therefore causes serious unbalanced driving torque phenomena in the cutterhead driving system. In this article, a cascade control scheme is proposed which is, namely, grouped into three control levels. In the high level, a nonlinear disturbance observer–based integral sliding mode control strategy integrated with anti-windup technique scheme is proposed to guarantee the tracking accuracy of the cutterhead rotational speed. Furthermore, the total driving torque of the electro-hydraulic hybrid cutterhead driving system is estimated by the disturbance observer. The middle level is the driving torque distributor which generates the torque reference for each driving unit. Owing to the nonlinear characteristics of the hydraulic system, an adaptive robust controller is introduced to guarantee the output torque of hydraulic motors and to track the torque reference signal. The torque tracking performance of electromotors is guaranteed by the converter. The co-simulations are carried out to verify the effectiveness and performance of the proposed cascade control scheme. The results show that the proposed control system can guarantee the cutterhead rotational speed tracking performance while overcome the biased load problems in pinion–ring gear transmission system of electro-hydraulic hybrid cutterhead driving system.

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“…The stability of the nonlinear observer is also analyzed. It follows from equations (8) and 12- 14that the observer error equation is given by…”

Section: Model Simplification and Issues To Be Addressedmentioning

confidence: 99%

“…These characteristics of hydraulic motor help a lot when TBM encounters extreme geology condition. [6][7][8] The drive units in EHCDS connect with each other rigidly through the pinion-ring gear transmission system (PRTS), 9 as shown in Figure 2.…”

Section: Introductionmentioning

confidence: 99%

A novel cutterhead cascade control strategy for hybrid-driving tunnel boring machines

Wang

Gong

Qin

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part I:

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“…A pump-controlled motor closed hydrostatic drive powertrain (HSDP) is a common technology used for rotary drives. Due to their advantages in terms of high power density, self-lubrication, simple overload protection, and wide speed regulation range, HSDPs have been widely applied to industrial and construction-related fields [1], such as in heavy manipulators [2], shield machines [3], wheel loaders [4], and heavy transportation vehicles [5]. However, they have also been criticized for their low efficiency and poor emission characteristics [6].…”

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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“…These systems operate based on direction pumps in the following configurations: variable displacement pumps cooperating with a motor supplied by the power network or a fixed displacement pump with a motor fed by FI. Performances for the same three systems in [23] have been discussed, more specifically including efficient displacement.…”

Section: Introductionmentioning

confidence: 99%

Electro-Hydraulic Drive of the Variable Ratio Lifting Device under Active Load

Kosucki

Stawiński

Morawiec

et al. 2021

SV-JME

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Hydraulic systems fed by fixed displacement pumps driven by frequency-controlled electric motors can replace conventional throttling systems due to their ability to control the speed of hydraulic cylinders regardless of the value and direction of the load. These systems can improve the energy efficiency of the drive or even provide the possibility of energy recuperation during lowering. This paper presents experimental studies of the new drive system with volumetric control of the speed of the lifted/lowered payload using the example of a scissor lift. The system uses a reversible gear pump driven by an asynchronous motor fed by a frequency inverter operating in field-oriented control mode. Comparative studies of the mapping of the assumed speed of the hydraulic cylinder and platform are presented, as well as studies of the influence of the load change on the speed and positioning of the mechanism driven by the open-loop controlled system.

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An Investigation in Performance of a Variable-Speed-Displacement Pump-Controlled Motor System

Cited by 13 publications

References 13 publications

A novel cutterhead cascade control strategy for hybrid-driving tunnel boring machines

A novel cutterhead cascade control strategy for hybrid-driving tunnel boring machines

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

Electro-Hydraulic Drive of the Variable Ratio Lifting Device under Active Load

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