Internal combustion engines with combined cam and electro-hydrau

Details Internal combustion engines with combined cam and electro-hydrau Internal combustion engines with combined cam and electro-hydrau

1997-10-22

1998-11-24

Lo, Weilun

Internal-combustion engines

Engine speed regulator

Responsive to deceleration mode

123321, 123 9012, 123 9016, F01L 1306

Patent

active

058394532

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).

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