Adaptive feedforward control of an electro-hydraulic variable valve actuator for internal combustion engines

2017 ◽  
Author(s):  
Huan Li ◽  
Guoming Zhu ◽  
Ying Huang
Keyword(s):  
Internal Combustion Engines ◽  
Feedforward Control ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Variable Valve ◽  
Adaptive Feedforward

Linear Parameter-Varying Model of an Electro-Hydraulic Variable Valve Actuator for Internal Combustion Engines

2017 ◽  
Vol 140 (1) ◽  
Author(s):  
Huan Li ◽  
Ying Huang ◽  
Guoming Zhu ◽  
Zheng Lou
Keyword(s):  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Time Varying ◽  
Linear Parameter ◽  
Linear Parameter Varying ◽  
Varying Parameters ◽  
Operational Conditions ◽  
Time Varying Parameters ◽  
Variable Valve

This paper presents a novel linear parameter-varying (LPV) model of an electro-hydraulic variable valve actuator (EHVVA) for internal combustion engines that is capable of continuously varying valve timing with dual-lift. The dual-lift is realized mechanically through a hydraulic lift control sleeve; valve opening (VO) terminal and closing seating velocities are regulated using a top or bottom snubber; and opening and closing timings, as well as lift profile area, are controlled by the valve actuation timing and hydraulic supply pressure. First, nonlinear mathematical system model is developed based on the Newton's law, orifice flow equation, and fluid constitutive law, where the fluid dynamics of the actuation solenoid valve, actuation piston, passages, and orifices, that influence the engine valve profile, are considered in detail. Second, to have an LPV control-oriented model, the order of nonlinear model is reduced and subsequently transformed into an LPV model with minimal deviation by carefully considering the system nonlinearities, time delay, and time-varying parameters. Calibration and validation experiments for both nonlinear and LPV models were performed on the test bench under different operational conditions. The key time-varying parameters, the time constant of the actuation piston top pressure and the discharge coefficient, are highly nonlinear as functions of temperature-sensitive fluid viscosity and are determined using the test data through the least-squares optimization. With the identified and calibrated model parameters, simulation results of both nonlinear and LPV models are in good agreement with the experimental ones under different operational conditions.

Effects of Supercharging, EGR and Variable Valve Timing on Power and Emissions of Hydrogen Internal Combustion Engines

2008 ◽  
Vol 1 (1) ◽  
pp. 647-656 ◽  
Author(s):  
Sebastian Verhelst ◽  
Jannick De Landtsheere ◽  
Frederik De Smet ◽  
Christophe Billiouw ◽  
Arne Trenson ◽  
...  
Keyword(s):  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Variable Valve Timing ◽  
Combustion Engines ◽  
Valve Timing ◽  
Variable Valve

scholarly journals Review of Advancement in Variable Valve Actuation of Internal Combustion Engines

2020 ◽  
Vol 10 (4) ◽  
pp. 1216 ◽  
Author(s):  
Zheng Lou ◽  
Guoming Zhu
Keyword(s):  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Combustion Efficiency ◽  
Combustion Engines ◽  
Mechatronic Systems ◽  
Variable Valve Actuation ◽  
Increasing Demand ◽  
Electro Magnetic ◽  
Variable Valve ◽  
Valve Actuation

The increasing concerns of air pollution and energy usage led to the electrification of the vehicle powertrain system in recent years. On the other hand, internal combustion engines were the dominant vehicle power source for more than a century, and they will continue to be used in most vehicles for decades to come; thus, it is necessary to employ advanced technologies to replace traditional mechanical systems with mechatronic systems to meet the ever-increasing demand of continuously improving engine efficiency with reduced emissions, where engine intake and the exhaust valve system represent key subsystems that affect the engine combustion efficiency and emissions. This paper reviews variable engine valve systems, including hydraulic and electrical variable valve timing systems, hydraulic multistep lift systems, continuously variable lift and timing valve systems, lost-motion systems, and electro-magnetic, electro-hydraulic, and electro-pneumatic variable valve actuation systems.

Analysis and Simulation of an Oil Lubrication Pump for Internal Combustion Engines

2015 ◽  
Vol 137 (5) ◽  
Author(s):  
Emma Frosina ◽  
Adolfo Senatore ◽  
Dario Buono ◽  
Luca Santato
Keyword(s):  
Simulation Model ◽  
Internal Combustion Engines ◽  
Experimental Tests ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Oil Lubrication ◽  
Variable Valve Actuation ◽  
Depth Analysis ◽  
Pump Shaft ◽  
Variable Valve

This paper presents a simulation model of an oil-lubrication gerotor pump for internal combustion engines. The model was constructed by using a monodimensional commercial code that accounted for all phenomena that occur during the revolution of the pump shaft. Several geometric considerations and theoretical observations are presented. An experiment was also performed to validate the simulation model. In these experimental tests, particular attention was paid to the behavior of the pressure oscillations during the pump shaft revolutions. The final aim of this activity is to obtain an instrument that allows the in-depth analysis of the functioning of the pump and lubrication circuit. Additionally, this instrument can be coupled with other models (e.g., variable valve actuation (VVA) and variable valve timing (VVT)) to account for different problems experienced by the hydraulic components of engines.

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