| 摘要 |
<p>A control arrangement (5) for a gas exchange valve (3) in a piston engine (1) adapted between the camshaft (4) of the engine and the valve mechanism, which control arrangement comprises a body part (51) and a chamber (52) arranged therein, into which chamber a connection for hydraulic medium opens and in which a piston device (53) is movably arranged to be in mechanical force transmission connection with the camshaft and the valve mechanism at least for opening the valve (3). The connection for hydraulic medium comprise separately a feed conduit (58.1) and a discharge conduit (58.2) for hydraulic medium both opening to a chamber space (59) in the chamber (52), The chamber space (59) increases as the piston device (53) moves in the opening direction of the valve. For providing a delay of the closing of the gas exchange valve (3) hydraulic medium is arranged to be fed into said space (59), when the valve is being opened, the releasing of pressure in said chamber space (59) determining closing of the gas exchange valve (3). The discharge conduit (58.2) is provided with electronically controlled valve means (61) for adjustably determining the exact time of the releasing of pressure in said chamber space (59).</p> |
