Parameter Identification for Electrohydraulic Valvetrain Systems

Gray, James; Krstić, Miroslav; Chaturvedi, N.A.

doi:10.1115/1.4004780

Cited by 5 publications

(3 citation statements)

References 16 publications

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“…where k m and m are the force constant and mass of the electromagnetic actuator; c is the damping coefficient; S and v represent the displacement and velocity; I is the current in the coil; R and L are the coil resistance and coil inductance. Equation (9) shows that when the system inputs voltage v, coils generate current I. Then, coils with current suffer the electromagnetic force F mag in the air gap magnetic field.…”

Section: Mathematical Model Of the Systemmentioning

confidence: 99%

An Electric Load Simulator for Engine Camless Valvetrains

et al. 2019

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Camless valvetrains have become a promising direction to improve the performance of internal combustion engines. In this paper, an electric load simulator is proposed to simulate and implement gas force on the exhaust valve for camless valvetrains under semi-physical conditions. According to test data, the 1D gas-dynamic model was established to get boundary conditions and initial values for 3D finite element simulation. The 3D finite element simulation model was solved to obtain the gas force characteristics of the exhaust valve for camless valvetrains. The electromagnetic actuator was designed according to the system scheme and performance requirements of the electric load simulator. The PID (Proportion Integration Differentiation) algorithm was designed to control the output force of the electric load simulator and reproduce the gas force characteristics of the exhaust valve. It was found that the output force of the electric load simulator could follow the variation of the target gas force and meet the performance requirements of the electric load simulator based on simulation results and experimental results.

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Section: Mathematical Model Of the Systemmentioning

confidence: 99%

An Electric Load Simulator for Engine Camless Valvetrains

et al. 2019

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“…A physical model of an electro-hydraulic system is well documented in [13]. However, accurate knowledge of all physical parameters is hard, in particular, the orifice area which relies on the spool valve position, though some parameters can be measured or estimated [17]. Therefore, the standard method using steady state frequency response tests is preferably used for identification in a linear setting [11], [18].…”

Section: Plant Modelmentioning

confidence: 99%

Robust position tracking control of a camless engine valve actuator with time-varying reference frequency

Yoon

Yang

Sun

2014

53rd IEEE Conference on Decision and Control

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This paper presents robust position tracking control of an electro-hydraulic camless engine valve actuator with the reference of time-varying frequency. The valve actuator includes nonlinearities associated with the hydraulic flow and the nonlinear friction. To retain such nonlinearities, the stabilized valve actuator is modeled as a block-structured system using the Volterra series representation. For tracking control design, the extended generating dynamics, which is justified by frequency domain analysis of a feedback system, is applied to the robust time-varying tracking control which is based on the internal model principle. The given tracking control method is illustrated by both simulation and experiments. With the extended generating dynamics, tracking the reference of timevarying frequency shows significant improvement.

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“…The camless valve trains are considered to improve the performance of internal combustion engines in recent research [1,2]. The camless variable valve train (VVT) systems eliminate the camshafts and the valves can be driven by electromagnetic actuations [3,4], electrohydraulic actuations [5,6], or electro-pneumatic actuations [7]. The electromagnetic VVT (EMVT) is identified as the most flexible VVT employing sensitive electromagnetic linear actuator (EMLA) to draw the valve to open and close.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Analysis of an Electromagnetic Fully Variable Valve Train with a Magnetorheological Buffer

et al. 2019

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Electromagnetic fully variable valve train (EMVT) technology promises to improve the fuel economy and optimize the engine performance. A novel EMVT equipped with a magnetorheological buffer (EMVT with MR buffer) is proposed to suppress the valve seating impact in this paper. The magnetorheological buffer can adjust the damping characteristics of the whole system in the seating process. Valve precise motion control and better seating performance can be achieved through the coordinated control of electromagnetic linear actuator (EMLA) and MR buffer. For better analysis of system performance, establishing an accurate system dynamic model is the basis of the coordinated control system. A high-order nonlinear precise model integrating dynamics, electromagnetism, and fluid mechanic was established. Then, the Jacobi linearization model is carried out at the equilibrium seating point to build a control-oriented linearized model. The correctness and accuracy of the linearized model is verified. Experiments and simulations show that the valve precise motion can be well controlled to achieve fully variable actuation. And the valve soft landing can be completed under collaborative control.

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Parameter Identification for Electrohydraulic Valvetrain Systems

Cited by 5 publications

References 16 publications

An Electric Load Simulator for Engine Camless Valvetrains

An Electric Load Simulator for Engine Camless Valvetrains

Robust position tracking control of a camless engine valve actuator with time-varying reference frequency

Modeling and Analysis of an Electromagnetic Fully Variable Valve Train with a Magnetorheological Buffer

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