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US 4,253,480 AGranted
Pressure regulator for fluid pressures
AssigneeKnorr-Bremse GmbH
InventorsGerd Kessel, Heinrich Kummeke, Hans-Jurgen Kupfer, Joachim Rau
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AssigneeKnorr-Bremse GmbH
InventorsGerd Kessel, Heinrich Kummeke, Hans-Jurgen Kupfer, Joachim Rau
Estimating the term…
A pressure regulator has at least one solenoid valve operated by electrical signals connected to a container the actual pressure of which is indicated by a pressure electric transducer. A comparator generates a regulation signal which is the difference between the actual pressure and a command pressure signal. A regulator is connected to the comparator for generating a control signal to the solenoid valve in such a manner that the valve member of the solenoid valve is adjustable in a stable manner between intermediate positions within a range between the open and closed positions of the valve such that throttled pressure media continuously flows through the valve. The valve adjustment signal can be a continuously variable direct voltage which is proportional to the output signal of the regulator and may be a rectangular or saw-toothed voltage with a frequency exceeding the maximum actuating frequency of the solenoid valve. The regulator has an integral function and is preferably a proportional integral regulator. The container may be provided with both inlet and outlet valves for control of the pressure in the container and the regulator produces separate control signals for the inlet and outlet valves.
In a device for regulating the pressure of a fluid pressure medium, an electrically operated solenoid valve connected to a container and having a valve member in a passage therein movable between positions to open and close the valve passage, pressure-responsive means for generating a signal indicative of the actual pressure in a container, a comparator connected to said actual pressure signal generating means and generating a difference signal indicative of the difference between the actual pressure and a command pressure in the container, a regulator connected to said comparator to receive said difference signal and generating a regulator signal at an output thereof, means connected to said regulator output to receive said regulator signal for generating a control signal to adjust said valve member within a range intermediate the valve closed and open positions to provide a continuously variable passage through said valve during a predetermined period of time, said control signal comprises an impulse formed voltage having a frequency greater than the maximum actuating frequency of said solenoid valve.
Dependencies are inferred from the claim text.