| 摘要 |
An apparatus for controlling gas exchange valves is described, having at least one valve positioner (16), associated with a gas exchange valve (10), and a pressure supply device (25) which supplies the valve positioner (16) with a fluid under high pressure. The valve positioner (16) encompasses a working cylinder (17) having a positioning piston (21), coupled to the gas exchange valve (10), which delimits an upper pressure space (22) for valve closure and a lower pressure space (23) for valve opening, and encompasses a control valve (19) controlling the hydraulic pressure in the pressure spaces (22, 23). In order to reduce the manufacturing costs and electrical energy demand of the apparatus, the upper pressure space (22) is connected directly, and the lower pressure space (23) via a restrictor throttle (18), to the pressure supply device (25); and the control valve (19) is connected to the lower pressure space (23) and to a relief line (27). Depending on the switch position, the control valve (19) additionally connects the lower pressure space (23) to the relief line (27) or blocks it off from the relief line.
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