Internal combustion engine with combined cam and electro-hydraul

Details Internal combustion engine with combined cam and electro-hydraul Internal combustion engine with combined cam and electro-hydraul

1998-11-20

2000-10-03

Lo, Weilun

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

123 9012, 123 9016, 123321, 123322, F02M 2506, F01L 1306

Patent

active

061258288

ABSTRACT:
An internal combustion engine has electrically controlled hydraulic linkages between engine cams and engine cylinder valves. If it is desired to skip a cam lobe or to modify the response of an engine cylinder valve to a cam lobe, hydraulic fluid is selectively released from the associated hydraulic linkage to permit lost motion between the cam and the engine cylinder valve. Electrically controlled hydraulic fluid valves are used to produce the selective release of hydraulic fluid from the hydraulic linkages. The mode of operation of the engine can be changed (e.g., from positive power mode to compression release engine braking mode or vice versa), or more subtle changes can be made to modify the timing and/or extent of engine cylinder valve openings to optimize engine performance for various engine or vehicle operating conditions (e.g., different engine or vehicle speeds). The valves can be controlled to produce an exhaust gas recirculation event during various operating modes of the engine.

REFERENCES:
patent: 4084568 (1978-04-01), Sato et al.
patent: 4930463 (1990-06-01), Hare, Sr.
patent: 5146890 (1992-09-01), Gobert et al.
patent: 5273013 (1993-12-01), Kubis et al.
patent: 5537976 (1996-07-01), Hu
patent: 5564385 (1996-10-01), Hakansson

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