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

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

Application of a Variable Valve Event and Timing System to Automotive Engines

2000 ◽  
Author(s):  
Seinosuke Hara ◽  
Akira Hidaka ◽  
Naoki Tomisawa ◽  
Makoto Nakamura ◽  
Tamotsu Todo ◽  
...  
Keyword(s):  
Automotive Engines ◽  
Timing System ◽  
Variable Valve ◽  
Valve Event

Intake and Exhaust Systems Equipped with a Variable Valve Control Device for Enhancing of Engine Power

2001 ◽  
Author(s):  
Tetsuya Nakayasu ◽  
Hajime Yamada ◽  
Toshikazu Suda ◽  
Noritoshi Iwase ◽  
Kyo Takahashi
Keyword(s):  
Control Device ◽  
Variable Valve ◽  
Valve Control ◽  
Engine Power ◽  
Exhaust Systems

The variable valve timing mechanism for the Rover K16 engine Part 1: Selection of the mechanism and the basis of the design

2000 ◽  
Vol 214 (2) ◽  
pp. 197-205 ◽  
Author(s):  
P. H. Parker
Keyword(s):  
Feasibility Study ◽  
Development Work ◽  
Variable Valve Timing ◽  
Valve Timing ◽  
Timing Mechanism ◽  
Automotive Engines ◽  
Engine Part ◽  
Variable Valve ◽  
Selection Of

Variable valve timing has become an important feature of automotive engines as part of the search for a better compromise between performance, economy and emissions. This paper describes the Rover VVC system and has been written in two parts. The first part covers the initial feasibility study, the selection of the mechanism and the unique features evolved to suit the K16 engine. The second part covers the detailed mechanical layout, the development work undertaken and the performance obtained.

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.

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