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A Design Compensation for Stable Flow/Pressure Control of Variable Displacement Type Piston Pump  

Jung, Dong-Soo (Hydraulic & Pneumatic Research Team, KIMM)
Kim, Hyoung-Eui (Hydraulic & Pneumatic Research Team, KIMM)
Kang, E-Sok (Department of Mechanical Design Engineering, Chungnam National University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.15, no.2, 2007 , pp. 165-174 More about this Journal
Abstract
Variable displacement type piston pump uses various controllers for controlling more than one state quantity like pressure, flow, power, and so on. These controllers need the mathematical model closely expressing dynamic behavior of pump for analyzing the stability of control systems which usually use various kinds of state variables. This paper derives the nonlinear mathematical model for variable displacement type piston pump. This model consists of two 1st oder differential equations by the continuity equations and one 2nd oder differential equation by the motion equation. To simplify the model we obtain the linear state variable model by differentiating the three nonlinear equations. And we verify this linearized model by comparison of simulation with experimentation and analyze the stability for the flow/pressure control. Finally this paper suggests the design compensation to ensure the stability of the systems.
Keywords
Design compensation; Stability; Pressure control; Flow control; Variable displacement; Piston pump;
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