Variable valve timing technologies for internal combustion engines are used to improve power, torque, reduce emissions and increase fuel efficiency. Firstly, the paper presents a new electrohydraulic FVVA system which can control the seating velocity of engine valve flexibly. Secondly, based on the NSGA-II genetic algorithm, outlines multi-objective optimization strategy, the paper designs the parameters of FVVA system to make the system easier to implement. Thirdly, the paper builds the combined FVVA engine simulation model. The combined simulation and experimental are executed to validate the designed FVVA engine. Simulation results show brake power is improved between 1.31% and 4.48% and torque is improved by 1.32% to 4.47%. Brake thermal efficiency and volumetric efficiency also show improvement. Experimental results have good agreement with simulation results. The research results can provide a basis for engine modification design.

Volume Subject Area:
Engine Design and Mechanical Development
Topics:
Diesel engines, Simulation, Engines, Brakes, Simulation results, Torque, Valves, Design, Emissions, Fuel efficiency, Genetic algorithms, Internal combustion engines, Pareto optimization, Simulation models, Thermal efficiency
This content is only available via PDF.
Copyright © 2018 by ASME
You do not currently have access to this content.