Variable Speed Hydraulic Control System Based on Energy Regulation Strategy

Shen, Haikuo

doi:10.3901/jme.2009.05.209

Cited by 9 publications

(7 citation statements)

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“…When the PDV is closed, and Q l0 , Q r0 , K cl and K cr are zero in Equations (11) and (12), the LPVC mode and RPVC mode will switch to the VSPC mode, and its open-loop dynamic equation is [1,2,20]…”

Section: Valve-pump Parallel Control Motor Linkmentioning

confidence: 99%

“…Manasek [11] proposed a valve-pump series variable-speed hydraulic system to accelerate the response of the pump control, where a flow control valve is installed in series on the main circuit. An energy-regulating device is added to the above system, and forms a variable-speed hydraulic system based on energy regulation [12][13][14]. The energy-regulation device can absorb redundant energy during the system deceleration, as well as release energy during the system acceleration; so the dynamic response of this system can be increased.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic characteristic analysis of replenishing/leaking parallel valve control systems

Ding

Zhao

2017

Automatika

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To improve the dynamic response of traditional pump control systems, this paper proposes two new control schemes: replenishing parallel valve control (RPVC) and leaking parallel valve control (LPVC). A parallel valve control system using the two control schemes is designed, and its system parameters, control performances and efficiency are analysed and verified by simulation and experiments. Compared to the pump control system, the proposed system has larger damping ratios which vary widely with operating points, and has lower velocity stiffness due to the increase of total leakage coefficients. Both the LPVC and RPVC could contribute to the dynamic response improvement. RPVC is preferred over LPVC because of more stable damping ratios and higher speed stiffness, and these advantages could be further improved by increasing the supply pressure of the control valve, but the LPVC scheme costs lower due to the unnecessary oil supply for the control valve. During the control process, the valve works at a low flow rate, but the pump provides the majority of the system flow, so two parallel valve control systems still have relatively high energy efficiency with rapid response. Therefore, the RPVC and LPVC will enrich the control mode of hydraulic systems.

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Section: Valve-pump Parallel Control Motor Linkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic characteristic analysis of replenishing/leaking parallel valve control systems

Ding

Zhao

2017

Automatika

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show abstract

“…To accelerate the response of VSPC systems, Manasek [11] proposes a valve-pump series 2 of 14 control system, in which a flow control valve is connected in series to the outlet of the pump. Shen et al propose a variable speed hydraulic control system based on an energy regulation strategy [12,13], in which an energy regulation device releases energy to improve dynamic response serial valve-pump control systems are not suitable for high power systems, due to the control valve installed in the main circuit limiting maximum flow of the system. However, valve-pump parallel control systems can avoid this disadvantage, as the parallel control valve in the main circuit does not limit the system flow.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Valve-Pump Weight Ratios on the Dynamic Response of Leaking Valve-Pump Parallel Control Hydraulic Systems

et al. 2018

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A new leaking valve-pump parallel control (LVPC) oil hydraulic system is proposed to improve the performance of dynamic response of present variable speed pump control (VSPC) system, which is an oil hydraulic control system with saving energy. In the LVPC, a control valve is operating at leaking status, together with a variable speed pump, to regulate the system flow of hydraulic oil simultaneously. Therefore, the degree of valve control and pump control can be adjusted by regulating the valve-pump weight ratio. The LVPC system design, mathematical model development, system parameter and control performance analysis are carried out systematically followed by an experimental for validation process. Results have shown that after introducing the valve control, the total leakage coefficient increases significantly over a wide range with the operating point and this further increases damping ratios and reduces the velocity stiffness. As the valve-pump weight ratio determines the flow distribution between the valve and the pump and the weight factors of the valve and/or the pump controls determines the response speed of the LVPC system, thus if the weight factors are constrained properly, the LVPC system will eventually have a large synthetic open-loop gain and it will respond faster than the VSPC system. The LVPC will enrich the control schemes of oil hydraulic system and has potential value in application requiring of fast response.

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“…Manasek [13] proposed a valve-pump series control to fasten the pump control response. Shen et al and Jin et al [14,15] added energy-regulating device to above series control to improve the response at acceleration stage. Xu et al [16] proposed a pump/valve coordinate control of the independent metering system for mobile machinery, which is also valve-pump series control and could work at work in multimodes.…”

Section: Introductionmentioning

confidence: 99%

Valve‐Pump Parallel Variable Mode Control for Complex Speed Regulation Processes

et al. 2018

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To improve comprehensive performances of hydraulic systems with complex speed regulation processes, this paper proposes a new control scheme, valve-pump parallel variable mode control, which can change control modes according to control requirements and adjust the proportion of valve control and pump control in the speed regulation process. In this paper, we design a valve-pump parallel variable mode control system, explain its working principle, establish its mathematical model, analyse the influences of valve control on the system parameters, and at last, build an experimental system to carry out an experimental research. The experimental results show that during the speed regulation process, control modes could vary with control requirements, the switch between different control modes is smooth and meets expectations, and the proposed control approach can achieve excellent comprehensive performances for complex speed regulation, such as low-speed stability, fast response to load disturbance, and high efficiency. The valve-pump parallel variable mode control makes hydraulic control systems more flexible and suitable and enrich the current control schemes of hydraulic speed regulation systems.

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Variable Speed Hydraulic Control System Based on Energy Regulation Strategy

Cited by 9 publications

References 0 publications

Dynamic characteristic analysis of replenishing/leaking parallel valve control systems

Dynamic characteristic analysis of replenishing/leaking parallel valve control systems

The Influence of Valve-Pump Weight Ratios on the Dynamic Response of Leaking Valve-Pump Parallel Control Hydraulic Systems

Valve‐Pump Parallel Variable Mode Control for Complex Speed Regulation Processes

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