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US 7,478,614 B2Granted
Variably operated valve system for compression ignition engine
AssigneeHitachi, Ltd.
InventorsMakoto Nakamura, Seinosuke Hara, Seiji Suga, Masahiko Watanabe, Tomio Hokari
Life of this patent
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Abstract
In a variably operated valve system for a compression ignition engine, an adjustment mechanism 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 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.
Claims19
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.
1 more element
Dependencies are inferred from the claim text.