Patent ID: 6705544
Filing Date: 2004-03-16
Classification: F02D,F02M,F16K

Abstract:
A valve for regulating fluids, having a piezoelectric unit (4) for actuating a valve member (3), which is axially displaceable in a bore (13) of a valve body (7) and is embodied with at least one control piston (9), adjacent to the piezoelectric unit (4), and at least one actuating piston (14), adjacent to a valve closing member (15), between which pistons a hydraulic chamber (16) acting as a hydraulic booster is disposed, and the valve closing member (15) cooperates with at least one valve seat (18, 19) for opening and closing the valve and divides a low-pressure region (20) from a high-pressure region (21), and the pressure level in the high-pressure region (21) is one parameter for setting a trigger voltage for the piezoelectric unit (4), characterized in that an electric control unit (12) specifies the trigger voltage for the piezoelectric unit (4) as a function of a leakage loss from the low-pressure region (20), in particular from the hydraulic chamber (16), and of the refilling of the low-pressure region.