Robust Flow Control of a Syringe Pump Based on Dual-Loop Disturbance Observers

Kim, Heeseong; Cheon, Dasol; Lim, Jiseok; Nam, Kwangwoo

doi:10.1109/access.2019.2942062

Cited by 11 publications

(3 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dual-loop control method is used to divide the entire control system into an inner loop and an outer loop [26]. The inner loop controller is primarily responsible for monitoring and regulating the actual output of the system to ensure the response speed and accuracy of the system, while the outer loop controller is responsible for controlling the stability of the system.…”

Section: Dual-loop Positive Flow Control Methodsmentioning

confidence: 99%

Dynamic Response Analysis of the Bi-Tandem Axial Piston Pump with Dual-Loop Positive Flow Control under Pressure Disturbance

et al. 2023

View full text Add to dashboard Cite

The bi-tandem axial piston pump is an indispensable powerhouse in high-pressure and high-power engineering hydraulic systems, with its output flow response characteristics under pressure disturbance exerting a significant influence on the working process of double pumps. Unfortunately, the stability of the original single-loop mechanical–hydraulic servo control system is sensitive to unpredictable interference. To alleviate this quandary, this paper proposes a dual-loop positive flow control method for the flow control of the bi-tandem axial piston pump, establishes a mathematical model of the bi-tandem axial piston pump with dual-loop positive flow control, and establishes a simulation model based on Simulink. The validity of the model is verified by experiments. The performance advantages of the dual-loop positive flow control method relative to the single-loop positive flow control method are analyzed. The results show a faster response speed and smaller steady-state error with the dual-loop method, which performs better than the original single-loop positive flow control. Furthermore, the study examines the influence of different forms, degrees, and directions of pressure disturbance on the dynamic response characteristics of the bi-tandem axial piston pump. Symmetric pressure disturbance results in an increase in the maximum relative error of the output flow proportional to its degree. Notably, the influence of asymmetric pressure disturbance on the output flow of the double pumps possesses characteristics of a superimposable nature, and the steady-state value of the output flow is highly dependent on superimposed pressure disturbance and less affected by the action time point of asymmetric pressure disturbance. Further, the unloading pressure disturbance exerts less influence on the system compared to the loading pressure disturbance. This paper provides valuable insights into improving the response speed and control accuracy of bi-tandem axial piston pumps equipped with positive flow control.

show abstract

Section: Dual-loop Positive Flow Control Methodsmentioning

confidence: 99%

Dynamic Response Analysis of the Bi-Tandem Axial Piston Pump with Dual-Loop Positive Flow Control under Pressure Disturbance

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Due to the transient response of the piston's rubber, the piston velocity is not strictly equal to the velocity of the fluid. As for the silicone oil syringe, the relationship between the velocity of the silicone oil piston u and the velocity of the silicone oil v f i can be considered a first-order system [28]:…”

Section: Modeling Of Liquid-driven Injection Systemmentioning

confidence: 99%

Liquid-Driven Microinjection System for Precise Fundus Injection

Xu,

Hu,

Liu

et al. 2024

Sensors

View full text Add to dashboard Cite

Microinjection is usually applied to the treatment of some retinal disorders, such as retinal vein cannulation and displaced submacular hemorrhage. Currently, the microinjection procedure is usually performed by using the viscous fluid control of a standard vitrectomy system, which applies a fixed air pressure through foot pedal activation. The injection process with the fixed pressure is uncontrollable and lacks feedback, the high flow rate of the injected drug may cause damage to the fundus tissue. In this paper, a liquid-driven microinjection system with a flow sensor is designed and developed specifically for fundus injection. In addition, a PID sliding mode control (SMC) method is proposed to achieve precise injection in the injection system. The experimental results of fundus simulation injection demonstrate that the microinjection system meets the requirements of fundus injection and reduces the impact of the injection process on the fundus tissue.

show abstract

“…Using a motor controller and a lead screw, the syringe pump can provide an on-demand flow rate without a flow sensor. But there are some technical issues associated with the use of syringe pumps, including the significant time delay, pulsating fluid flow, and mechanical stress that can cause chip leakage even equipment damage [23][24][25]. As an option, pressure-driven 2022 JINST 17 P10038 pumps allow for a fast response and pulseless flow, but it only provides flow pressure rather than the flow rate, thus it is often difficult to read the flow rate without a flow sensor [26].…”

Section: Introductionmentioning

confidence: 99%

Pressure-driven dynamical microfluidic pumping system for droplet production

Yu¹,

Wei²,

Li³

et al. 2022

J. Inst.

View full text Add to dashboard Cite

Compact and affordable microfluidic pumping is critical for point-of-care applications. Here we proposed a data driven dynamical system to build up a pressure-driven microfluidic pump with a small budget. Firstly, a precision flow sensor is required to obtain the dynamic flow rates as the responses to the driven pressures. Then the flow rate dataset under varying operation pressures is used for data training and model-based system identification. With a first-order or second-order transfer function model, the specifications of pressure-driven microfluidic pumping system are analyzed by the model-based system identification algorithm. Also, all the specifications including the gain, time constant, natural frequency, and damping ratio are updated online as new test data are introduced from more experimental trials. To perform a non-bulky design purpose, the data training system identification is taken on a commercial smartphone. Once the training performance is satisfied, the pressure-driven system could be operated without any flow sensors. The system is used for two-phase flow controls as a demonstration, showing a rapid response of pumping. Dynamic characteristics and the effects of flow resistance on the pumping performance are analyzed to verify its suitability for a wide range of microfluidic applications.

show abstract

Robust Flow Control of a Syringe Pump Based on Dual-Loop Disturbance Observers

Cited by 11 publications

References 32 publications

Dynamic Response Analysis of the Bi-Tandem Axial Piston Pump with Dual-Loop Positive Flow Control under Pressure Disturbance

Dynamic Response Analysis of the Bi-Tandem Axial Piston Pump with Dual-Loop Positive Flow Control under Pressure Disturbance

Liquid-Driven Microinjection System for Precise Fundus Injection

Pressure-driven dynamical microfluidic pumping system for droplet production

Contact Info

Product

Resources

About