Camless Variable Valve Actuator with Two Discrete Lifts Jiangsu Gongda Power Technologies Limited

Format:

Conference/Event

Author/Creator:

Lou, Lou, author.

Contributor:

Qian, Jianhua

Sun, Ming

Wen, Shao

Xu, Huaiping

Zhu, Guoming

Conference Name:

SAE 2015 World Congress & Exhibition (2015-04-21 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2015

Summary:

AbstractCamless Variable Valve Actuation (VVA) technologies have been known for improving fuel economy, reducing emissions, and enhancing engine performance. VVA can be divided into electro-magnetic, electro-hydraulic, and electro-pneumatic actuation. This paper presents an electro-hydraulic VVA design (called GD-VVA-2) that offers continuously variable timing and two discrete lifts (low lift S1 and high lift S2). The lift control is achieved through a lift control sleeve, which is hydraulically switched between two mechanically defined positions to provide accurate lifts. The low lift S1 has a wide design range, anywhere between zero and the high lift S2, id est, 0 < S1 < S2. If S1 0.5*S2, engine valves may operate at the low lift during most of a typical drive cycle. Operation at the low lift reduces energy consumption significantly. The GD-VVA-2 design offers compact package size and reasonable energy consumption. One of the prototype samples has passed 400 hours of 6000-rpm durability test on a test bench

Notes:

Vendor supplied data

Publisher Number:

2015-01-0324

Access Restriction:

Restricted for use by site license