Development of Hydraulic- Controlled Variable Valve Lift System for Scooter Engine

2016 ◽  
Vol 9 (4) ◽  
pp. 2493-2497 ◽  
Author(s):  
Guo-Rong Wun ◽  
Cheng-Tse Chuang ◽  
Yong-Fu Syu ◽  
Chia-Sheng Wang ◽  
Yuh-Yih Wu
Keyword(s):  
Valve Lift ◽  
Variable Valve Lift ◽  
Variable Valve

INA EcoValve A Continuously Variable Valve Lift (CVVL) System

2004 ◽  
Author(s):  
Frank Himsel ◽  
Christof Faria ◽  
Peter Solfrank ◽  
Ulrich Grau ◽  
Uwe Geiger
Keyword(s):  
Valve Lift ◽  
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.

scholarly journals An Investigation into In-Cylinder Tumble Flow Characteristics with Variable Valve Lift in a Gasoline Engine

2014 ◽  
Vol 94 (2) ◽  
pp. 285-304 ◽  
Author(s):  
Tianyou Wang ◽  
Daming Liu ◽  
Bingqian Tan ◽  
Gangde Wang ◽  
Zhijun Peng
Keyword(s):  
Gasoline Engine ◽  
Flow Characteristics ◽  
Valve Lift ◽  
Variable Valve Lift ◽  
Variable Valve

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.

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