Robust controller design for the excavator swing system under the active regulating common pressure rail

Shen, Wei; Su, Xiaoyu; Pang, Yu; Zhao, Ruihan

doi:10.1177/0142331217707369

Cited by 12 publications

(9 citation statements)

References 26 publications

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“…This is because the control angle d not only determines the pressure difference between the adjacent ports but also changes the geometric flow rate q g at the transition regions. According to equation (1), the increase of the geometric flow rate q g will cause the pressure to increase in the piston chamber. When the pressure difference between the two adjacent ports on the valve plate does not match the pressure change in the piston chamber, the pressure spike will occur.…”

Section: Resultsmentioning

confidence: 99%

“…The maximum and minimum values reach 9.5 and 0.1 MPa, respectively, at n = 1500 r/min, while the pressure variations are smooth at both 1000 and 500 r/min. According to equation (1), the geometric flow rate q g is proportional to the rotating speed, when the rotating speed exceeds the capability of the damping grooves, the pressure undershoots and overshoots become serious accordingly. Therefore, the maximum rotating speed should be limited to avoid serious pressure spikes, especially at small control angles as discussed before.…”

Section: Effect Of the Valve Plate Control Anglementioning

confidence: 99%

“…The swashplate angle g is fixed during the working process. According to equation (1), it is also an important parameter affecting the pressure characteristics. Figure 14 shows the effects of the swashplate angle on the cylinder pressure of one side of DRHT when d = 17°a nd n = 1500 r/min.…”

Section: Effect Of the Swashplate Anglementioning

confidence: 99%

“…The common pressure rail (CPR) system in combination with the hydraulic transformer (HT) is a new type of hydraulic energy–saving system, which decouples the supply side from the actuators, allowing optimal engine operation independent of the current power demand, and it has a wide application prospect in engineering machinery, automobile and test equipment. 1–4…”

Section: Introductionmentioning

confidence: 99%

“…The common pressure rail (CPR) system in combination with the hydraulic transformer (HT) is a new type of hydraulic energy-saving system, which decouples the supply side from the actuators, allowing optimal engine operation independent of the current power demand, and it has a wide application prospect in engineering machinery, automobile and test equipment. [1][2][3][4] The HT is the core component when it works with the CPR system. It absorbs the necessary hydraulic power and delivers this power at the required pressure and flow, similar to an electric transformer that transforms voltage and current.…”

Section: Introductionmentioning

confidence: 99%

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Pressure characteristics of a novel double rotor hydraulic transformer

Jiang

Liu

2019

Proceedings of the Institution of Mechanical Engineers, Part I:

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The hydraulic transformer is the core component when it works with the common pressure rail system, which integrates the functions of the pump and the motor, and thus possesses sensitive pressure characteristics. The rotating speed has significant influence on the pressure characteristics of a hydraulic transformer while it has not been considered previously. In this study, aimed at improving the working performance, a novel double rotor hydraulic transformer is proposed and a comprehensive mathematical model considering the dynamic characteristics of the cylinder block is established. At the same time, a prototype is made and the experiment is conducted. The test results show that the robust rotor structure enables a larger pressure range, and the numerical results exhibit a good match with the test results. The parameter sensitivity study shows that the delivery pressure is mainly subject to the valve plate control angle δ and, under the effects of the resistance torques, pressure loss will occur especially under a large control angle and a high rotating speed. The magnitude of the instantaneous angular velocity fluctuation increases sharply when the speed is lower than 400 r/min, which is the main reason for the serious pressure pulsation at a low speed. As a result of the improved low-speed stability and output flow uniformity, the pressure pulsation rate of the double rotor hydraulic transformer is greatly reduced. However, the pulsation rate is still high at an extremely low speed. In addition, when the rotating speed exceeds the capability of the damping grooves, the pressure undershoot becomes serious at the A-T transition region around the control angle of −30°. Consequently, from the perspective of pressure characteristics, the limitation on the rotating speed under small control angles is suggested for the design of the double rotor hydraulic transformer controller.

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Section: Resultsmentioning

confidence: 99%

Section: Effect Of the Valve Plate Control Anglementioning

confidence: 99%

Section: Effect Of the Swashplate Anglementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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