| 摘要 |
<p>An engine (20) with a valve actuator (70) to extend duration of a valve event and method of controlling an engine (20) with such an actuator (70) are disclosed. The actuator (70) may include an actuator cylinder (74) with an actuator piston (72). The actuator (70) contains an electrorheological fluid (88). A magnetic flux may be applied the electrorheological fluid (88) to prevent or slow movement of the actuator piston (72) and change valve movement with respect to its regular, cyclical operation provide for with a cam (60). A biasing means (84) is connected with the actuator piston (72) to allow positioning of the valve actuator (70) in an existing engine design.
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