Nonlinear System Modeling, Optimal Cam Design, and Advanced System Control for an Electromechanical Engine Valve Drive

Abstract

Abstract-A cam-based, shear force actuated electromechanical valve drive system offering variable valve timing in internal combustion engines was previously proposed and demonstrated. To transform this concept into a competitive commercial product, several major challenges need to addressed, including the reduction of power consumption, transition time, and size. As shown in this paper, by using nonlinear system modeling, optimizing cam design, and exploring different control strategies, the power consumption has been reduced from 140 W to 49 W (65%), the transition time has been decreased from 3.3 ms to 2.7 ms (18%), and the actuator torque requirement has been cut from 1.33 N-m to 0.30 N-m (77%).Index Terms-Open-loop control, optimal cam design, nonlinear friction model, variable valve timing.

Automatic Test and Sorting System for the Slide Valve Body of Oil Control Valve Based on Cartesian Coordinate Robot

“…OCV is an important part of the traditional VVT (Variable Valve Timing) system and it is the oil control valve that controls the timing of the engine intake valve. Most automotive engines use the structure of extrapolated OCV to achieve the best performance [9][10][11]. OCV is essentially an electromagnetic sliding valve which controls the direction and flow of engine oil [12], including the magnet part and the slide valve body part.…”

Optimization of Radial Cams with Translating Roller Follower through Genetic Algorithms

“…Consider a planar cam mechanism [18,19] with a centered translating roller follower, where the mover is opportunely shaped and rotates around an axis, which is orthogonal to the movement plane and intercepts this plane in the point O. The coupling between mover and follower allows to transmit a motion to the follower; and this, due to its kinematical constraints, translates along an axis belonging to the movement plane and passing through O, as shown in Fig.…”