A Study of a Continuous Variable Valve Event and Lift (VEL) System

2001 ◽  
Author(s):  
Shinichi Takemura ◽  
Shunichi Aoyama ◽  
Takanobu Sugiyama ◽  
Tsuneyasu Nohara ◽  
Katsuya Moteki ◽  
...  
Keyword(s):  
Continuous Variable ◽  
Variable Valve ◽  
Valve Event

A Continuous Variable Valve Event and Lift Control Device (VEL) for Automotive Engines

2001 ◽  
Author(s):  
Makoto Nakamura ◽  
Seinosuke Hara ◽  
Yoshihiko Yamada ◽  
Keisuke Takeda ◽  
Naoki Okamoto ◽  
...  
Keyword(s):  
Continuous Variable ◽  
Control Device ◽  
Automotive Engines ◽  
Lift Control ◽  
Variable Valve ◽  
Valve Event

Development of Continuous Variable Valve Event and Lift Control System for SI Engine (VEL)

2008 ◽  
Vol 1 (1) ◽  
pp. 949-959 ◽  
Author(s):  
Yoshihiko Yamada ◽  
Kenichi Machida ◽  
Tetsuo Yamazaki
Keyword(s):  
Control System ◽  
Continuous Variable ◽  
Si Engine ◽  
Lift Control ◽  
Variable Valve ◽  
Valve Event

scholarly journals FEASIBILITY OF BACKFIRE CONTROL AND PERFORMANCE USING CHANGES OF VALVE OVERLAP PERIOD FOR A HYDROGEN-FUELED ENGINE WITH EXTERNAL MIXTURE

2009 ◽  
Vol 12 (14) ◽  
pp. 77-85
Author(s):  
Cong Thanh Huynh ◽  
Kang Joon-Kyoung ◽  
Noh Ki-Cholo ◽  
Lee Jong-Tai ◽  
Mai Xuan Pham
Keyword(s):  
High Efficiency ◽  
Engine Performance ◽  
Continuous Variable ◽  
Variable Valve Timing ◽  
Valve Timing ◽  
Performance Loss ◽  
Wide Range ◽  
And Performance ◽  
Variable Valve ◽  
Valve Overlap

The development of a hydrogen-fueled engine using an external mixture (e.g., using port injection) with high efficiency and high power is dependent on the control of backfire. This work has developed a method to control backfire by reducing the valve overlap period. For this goal, a single-cylinder hydrogen-fueled research engine with a mechanical continuous variable valve timing (MCVVT) system was developed. This facility provides a wide range of valve overlap periods that can be continuously and independently varied during firing operation. In experiments, the behavior of backfire occurrence and engine performance are determined as functions of the valve overlap period for fuel-air equivalence ratios between 0.25 and 1.2. The results showed that the research engine with the MCVVT system has similar performance to a conventional engine, and is especially effective in controlling the valve overlap period. The obtained results demonstrate that decreasing the valve overlap period may be one of the methods for controlling backfire in a H engine. Also, a method for compensating performance loss due to shortened valve overlap period is recommended.

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.

Lubrication Technology and Analysis for Variable Valve Event and Lift (VVEL) System

2009 ◽  
Author(s):  
Yuzou Akasaka ◽  
Shinichi Kiga ◽  
Makoto Kobayashi ◽  
Daisuke Watanabe
Keyword(s):  
Variable Valve ◽  
Valve Event

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

Development of Innovative Variable Valve Event and Lift (VVEL) System

2007 ◽  
Author(s):  
Shinichi Kiga ◽  
Yosuke Mae ◽  
Yuzo Akasaka ◽  
Kazuto Tomogane
Keyword(s):  
Variable Valve ◽  
Valve Event
Sign in / Sign up

Export Citation Format

Share Document