US 7,478,614 B2
Variably operated valve system for compression ignition engine
Makoto Nakamura, Kanagawa (Japan); Seinosuke Hara, Kanagawa (Japan); Seiji Suga, Kanagawa (Japan); Masahiko Watanabe, Kanagawa (Japan); and Tomio Hokari, Kanagawa (Japan)
Assigned to Hitachi, Ltd., Tokyo (Japan)
Filed on Mar. 06, 2006, as Appl. No. 11/367,587.
Claims priority of application No. 2005-127788 (JP), filed on Apr. 26, 2005.
Prior Publication US 2006/0236960 A1, Oct. 26, 2006
Int. Cl. F01L 1/34 (2006.01)
U.S. Cl. 123—90.15  [123/90.17; 123/90.31] 19 Claims
OG exemplary drawing
 
1. A variably operated valve system for a compression ignition engine, comprising:
an adjustment mechanism that is controlled by means of a control section to detach an intake valve closure timing from a bottom dead center in accordance with an engine driving condition; and
an engine start securing section that guarantees an engine start even at least one of cases during a failure in the control section, during a stop of the engine, and during a start of the engine, wherein the engine start securing section comprises a mechanical bias section, installed in the adjustment mechanism, that biases the adjustment mechanism to be directed for the intake valve closure timing to approach to a position, prior to an initial explosion, near the bottom dead center which is a most advanced angle position during at least one of the following cases: during the failure in the control section, during the stop of the engine, and during the start of the engine.