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M.a. Franchek – 1st expert on this subject based on the ideXlab platform
Engine idle speed control using actuator saturationIEEE Transactions on Control Systems Technology, 2000Co-Authors: P. Herman, M.a. FranchekAbstract:
Presented in this paper is the design and experimental validation of a saturating engine idle speed controller for a Ford V-8 fuel injected engine. The nonmeasurable external torque disturbance perturbing engine speed is delivered from the power steering pump. The performance specification is an allowable engine speed tolerance of 140 r/min about a desired set speed of 600 r/min. The controlled input is a voltage to the bypass Air Valve (BPAV) which regulates the Air ingested into the engine. The BPAV voltage available for engine speed regulation is bounded by 0.8 V. A frequency domain controller design methodology is used to design the controller The performance objective is satisfied using saturation control during large engine speed transients. During steady-state operation, the controlled input is not saturated.
Frequency based nonlinear controller design of regulating systems subjected to time domain constraintsProceedings of the 1999 American Control Conference (Cat. No. 99CH36251), 1999Co-Authors: J.w. Glass, M.a. FranchekAbstract:
Presented is a nonlinear controller design methodology for a class of regulating systems subjected to quantitative time domain constraints. The output and actuator saturation performance specifications are given as allowable time domain tolerances. The controller design is executed in the frequency domain and is applicable when the frequency response of a linear design cannot satisfy the gain and phase characteristics required by quantitative time domain specifications. A describing function (DF) approach, automated by the Volterra series, facilitates the nonlinear controller design. The resulting gain and phase distortions associated with the DF of the dynamic nonlinear element are used to achieve the desirable open loop gain and phase characteristics identified by the time domain constraints. The design methodology is illustrated on the idle speed control of a Ford 4.6L V-8 fuel injected engine. The engine input is the by-pass Air Valve and the regulated output is engine speed. The power steering pump generates the nonmeasureable external torque load.
NARMAX modeling and robust controller design of internal combustion enginesProceedings of the 1998 American Control Conference. ACC (IEEE Cat. No.98CH36207), 1998Co-Authors: J.w. Glass, M.a. FranchekAbstract:
Presented in this paper is robust controller design procedure utilizing a discrete nonlinear model. This model is converted to a describing function representation for the purpose of robust feedback controller design. The ideology for the describing function recovery is developed in the form of an algorithm which can be extended to other NARMAX model structures not considered here. For the engine idle speed control of this study, a SISO NARMAX model of the engine is given between the by-pass idle Air Valve (BPAV) and engine speed. From this model, a describing function representation is obtained for controller design subject to the time domain tolerance |/spl Delta/ rpm|/spl les/100 rpm on idle speed perturbations despite nonmeasurable 20 Nm external torque disturbance. The controller is validated through numerical simulations as well as experimental verification.
I. Garrido – 2nd expert on this subject based on the ideXlab platform
Control strategies for OWC wave power plantsProceedings of the 2010 American Control Conference, 2010Co-Authors: M. Amundarain, M. Alberdi, A.j. Garrido, I. GarridoAbstract:
The present work deals with the improvement of OWC-Wells turbine-generator systems by adequately choosing the applied control scheme. For this purpose, two different control strategies are presented and compared. In the first one, the control system does appropriately adapt the slip of the induction generator according to the pressure drop entry. The second control strategy consists of a traditional control of the OWC Air Valve. It is demonstrated that the proposed rotational speed control design adequately matches the desired relationship between the slip of the induction generator and the pressure drop input, whilst the Valve control using a traditional PID controller successfully governs the flow that modulates the pressure drop across the turbine.
Jian Zhang – 3rd expert on this subject based on the ideXlab platform
Study on the mathematical model of vacuum breaker Valve for large Air mass conditionsWater (Switzerland), 2019Co-Authors: Xiao Ying Zhang, Cheng Yu Fan, Xiao Dong Yu, Jian Zhang, Jia Wen Lv, Ting Yu XuAbstract:
The mathematical model of vacuum breaker Valve is significant to the protection scheme. The more accurate the vacuum breaker Valve model, the more reliable the calculation results. In this study, the application conditions of the Air Valve model are analyzed according to the assumptions used in the derivation, and the contradictions between these assumptions are proposed. Then, according to the different working characteristics between the vacuum breaker Valve on the siphon outlet pipe and the Air Valve, the vacuum breaker Valve model is deduced based on the modified assumptions. In the derivation process, the thermodynamic change of the gas in the vacuum breaker Valve is assumed to follow the isentropic process rather than an isothermal process, and the water level in the vacuum breaker Valve is considered to be changeable. An engineering case is introduced, and the results calculated according to the vacuum breaker Valve model are compared with those resulting from the Air Valve model. The results indicate that the vacuum breaker Valve model is suitable for large Air mass conditions and can provide a theoretical basis for the numerical simulation and settings of vacuum breaker Valves.
Study on Mathematic Model of Air Valve Based on Real Gas CharacteristicsVolume 4: Design Analysis Control and Diagnosis of Fluid Power Systems, 2007Co-Authors: Jianyong Hu, Jian Zhang, Yuan ZhengAbstract:
Air Valve is an important measure of water hammer protection in long water supply system. Accurate simulation of the Air-inlet and Air outlet process of Air Valve is directly relative to the safety of water supply engineering. Operational principle of Air Valve is analyzed and new mathematic model of Air Valve is built based on Van der Waals equation. Protective function of Air Valve in transient process caused by Valve closing is analyzed with the characteristics method. The result shows the new mathematic model of Air Valve presents a series of new characteristics in the process of Air-inlet and Air-outlet comparing with the old mathematic model based on ideal-gas state equation.Copyright © 2007 by ASME
Research on the Mathematic Model of Air ValveVolume 2: Fora Parts A and B, 2007Co-Authors: Jian Zhang, Jianyong Hu, Weihua LuAbstract:
Air Valve is an important measure of water hammer protection in long water distribution system. Volume of Air inflow and outflow, the maximum volume of Air inflow, and Air mass flow rate are not only relate to prefer choose of Air Valve type, but effect on the safety of water distribution engineering. So it is important to make a theoretical calculation of Air Valve precisely. Traditional mathematic model of Valve assumes that Air inflows and outflows the pipeline by isentropic process, then isothermal variation will occur. Though this model is simple in theory and its programming is easy, its two thermodynamic processes are not incongruous obviously which results in its physical achievement unexplainable theoretically. Because the isentropic process is reversible adiabatic and no heat exchange occurs, but achievement of isotherm process need heat exchange sufficiently. This paper raises a new mathematic model of Air Valve based on those models reported so far. The new model gives up the hypothesis of isotherm, and proves rationality of this model by mathematical induction. Calculation results of two mathematic models are compared by numerical analysis. This provides scientific basis for precise simulation of Air behavior through Air Valve and prefer choose of Air Valve type in long distribution system.Copyright © 2007 by ASME