| 摘要 |
The design and construction of current electronically-controlled hydraulically-actuated engine valve systems are currently still being tested for dependability. The electronics control various activities including actuation velocity and, therefore, can include complicated components. The present invention overcomes this and other problems by providing a valve actuation system (10) including an electronically-controlled hydraulically-actuated plunger (54) for actuating an engine valve (16). Hydraulic means (230, 240) are utilized for reducing the plunger velocity thereby controlling the valve lift and the valve seating as the valve (16) approaches the open and closed positions. The hydraulic means (230, 240) reduces the need for a complicated electronic control unit, therefore, improving the feasibility and dependability of the present invention. |
