Kinematic Analysis of Continuous Variable Valve Lift Mechanism for SI Engine

2017 ◽  
Author(s):  
Dileep Malkhede ◽  
Sudesh Jadhav ◽  
Amit Dhotre
Keyword(s):  
Kinematic Analysis ◽  
Continuous Variable ◽  
Valve Lift ◽  
Si Engine ◽  
Lift Mechanism ◽  
Variable Valve Lift ◽  
Variable Valve

Variable Valve Actuation for Advanced Powertrains

2008 ◽  
Author(s):  
Burak Gecim ◽  
Madhusudan Raghavan
Keyword(s):  
Valve Lift ◽  
Test Results ◽  
Variable Valve Actuation ◽  
Lift Mechanism ◽  
Comprehensive Survey ◽  
Variable Valve Lift ◽  
Direct Acting ◽  
Variable Valve ◽  
Considerable Detail ◽  
Valve Actuation

We review variable valve actuation (VVA) concepts and also present the results of our work in the creative synthesis of these devices. We begin with a comprehensive survey of existing VVA devices. We then describe our work on four VVA concepts which we have explored in considerable detail. These include hydraulic lost-motion variable-lift systems, in both the direct acting and the roller-finger-follower configurations, several valve deactivation mechanisms with unique features, a variable valve-lift mechanism, and a variable-lift and duration concept. These devices differ in their complexity and versatility but offer a spectrum of design solutions applicable to a range of products. The strengths and weaknesses of these different approaches are discussed and analyzed, and some test results are presented.

Optimal Design of Worm Gear System Usage in CVVL for Automobiles

2013 ◽  
Author(s):  
Nogill Park ◽  
Jonghyeon Sohn ◽  
Gyeangmyeang Baek ◽  
Chunghan Oh
Keyword(s):  
Error Function ◽  
Transmission Error ◽  
Continuous Variable ◽  
Worm Gear ◽  
Gear System ◽  
Valve Lift ◽  
Variable Valve Lift ◽  
Variable Valve ◽  
Motor Drive System ◽  
Worm Drive

Gearing with a ZK worm and an involute helical gear is used in the motor drive system of automotive continuous variable valve lift (CVVL) because of production cost. Since the geared system does not satisfy the meshing condition, transmission error (TE) and teeth interference (TI) are inevitable. This paper introduces a method for reducing TE and eliminating TI. Transmission error function is derived mathematically and used in checking TI. The first prototype for an automobile shows a lot of NVH problem, which is simply combined by coinciding with the helix/lead angles of two gears at the pitch point. By an optimal process with alternating the pressure and helix angles of worm gear system, an prototype of CVVL worm drive of which NVH problem is acceptably solved is designed.

Analytical synthesis and computer-aided kinematic analysis of a continuously variable valve lift mechanism

2016 ◽  
Vol 231 (2) ◽  
pp. 309-325 ◽  
Author(s):  
Adrian C Clenci ◽  
Vasile Hara ◽  
Nicolae-Doru Stănescu ◽  
Adrian Bîzîiac ◽  
Rodica Niculescu
Keyword(s):  
Kinematic Analysis ◽  
Transfer Functions ◽  
Valve Lift ◽  
Spark Ignition Engines ◽  
Intake Valve ◽  
Computer Aided ◽  
Lift Mechanism ◽  
Cam Profile ◽  
Variable Valve Lift ◽  
Analytical Synthesis

This paper presents an original continuously variable intake valve lift mechanism designed for the automotive spark ignition engines. The paper first presents the analytical kinematic synthesis of the variable intake valve lift mechanism, which consists in finding out the required intake cam profile starting from an imposed intake valve lift law. Then, by using the obtained cam profile, a computer-aided kinematic analysis of the variable intake valve lift mechanism is performed using commercial CAD software. The accuracy of the motion conversion performed with CAD software is validated by checking the degree of correlation between the resulted intake valve lift law and the imposed law used when performing the analytical synthesis. The goals of the kinematic analysis are first to find the partial laws of the intake valve lift, corresponding to the engine part loads and second, to find the transfer functions of the elements used to command the mechanism, i.e. the dependency between these elements and the intake valve lift law. The designed variable intake valve lift mechanism is successfully operated on an engine prototype and proved its energetic improvement potential.

Development of Continuously Variable Valve Lift Mechanism for Improved Fuel Economy

2012 ◽  
Author(s):  
Hermes Fernandez ◽  
Youssef Kazour ◽  
Michael Knauf ◽  
James Sinnamon ◽  
Edward Suh ◽  
...  
Keyword(s):  
Fuel Economy ◽  
Valve Lift ◽  
Lift Mechanism ◽  
Variable Valve Lift ◽  
Variable Valve

Development of a Motorcycle Engine with a Three-dimensional Cam for Continuous Variable Valve Lift and Timing Mechanism

2008 ◽  
Vol 1 (1) ◽  
pp. 1357-1365 ◽  
Author(s):  
Isato Taki ◽  
Muneaki Nakamura ◽  
Kenjiro Nakama ◽  
Kazutoshi Takahashi ◽  
Kosaku Yamauchi
Keyword(s):  
Three Dimensional ◽  
Continuous Variable ◽  
Valve Lift ◽  
Timing Mechanism ◽  
Variable Valve Lift ◽  
Variable Valve ◽  
Motorcycle Engine

Variable Valve Actuation Mechanism Using Magnetorheological Fluid

2005 ◽  
Author(s):  
H. Hirani ◽  
S. Dani
Keyword(s):  
Valve Lift ◽  
Frictional Torque ◽  
Valve Mechanism ◽  
Actuation Mechanism ◽  
Variable Valve Actuation ◽  
Lift Mechanism ◽  
Variable Valve Lift ◽  
Direct Acting ◽  
Variable Valve ◽  
And Control

A magnetorheological (MR) fluid based variable valve lift mechanism is presented. A test setup is designed to measure the frictional-torque and valve-displacement of a direct acting valve mechanism under various speed conditions. Results of valve lifts at different speeds and control currents are presented.

Development of a Custom Integrated Circuit for Continuously Variable Valve Lift Mechanism System Control

2008 ◽  
Author(s):  
Kazuya Kinoshita ◽  
Kazuhiko Ueda ◽  
Fumihiko Ito ◽  
Yasushi Shinojima ◽  
Takashi Yanagizawa ◽  
...  
Keyword(s):  
Integrated Circuit ◽  
Valve Lift ◽  
System Control ◽  
Lift Mechanism ◽  
Variable Valve Lift ◽  
Variable Valve
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