Method and apparatus for the control of a die casting or similar machine
AssigneeTymac Controls Corporation
InventorJohn R. Mickowski
Life of this patent
Estimating the term…
Abstract
An improved control system for die casting or similar machines wherein a closed loop velocity feedback circuit is supplemented with an integration circuit and two filtering circuits to compensate for the frequency response of the pilot valve in the die casting machine. The integration circuit serves to more accurately cause the velocity of an element being controlled to match the desired/commanded velocity, and also caused the velocity to more rapidly match the desired/commanded velocity.
Claims20
A method of controlling a reciprocating apparatus, said method comprising the steps of:
- measuring a parameter of the reciprocating apparatus that is desired to be controlled,
- comparing said measured parameter to a desired value of said parameter to generate an error signal;
- integrating said error signal, and
- utilizing said integrated error signal to adjust said parameter.
Apparatus for controlling a velocity of a reciprocating piston comprising:
- means for comparing a desired velocity to the actual velocity to be controlled and for generating an error signal in response to said comparison;
- means for integrating the error signal;
- and
- means for employing the integrated error signal to control and adjust said actual velocity.
Apparatus for controlling a die casting machine comprising:
- a velocity transducer for measuring the velocity of a reciprocating piston in said die casting machine;
- a comparator for comparing said velocity to a specified velocity profile, and for generating a difference signal in response to said comparison;
- and
- means for integrating said difference signal, and for combining said integrated difference signal with a signal indicative of a position of a valve.
Apparatus for controlling a machine comprising:
- means for measuring velocity of a reciprocating piston;
- means for generating an error signal between said measured velocity and a predetermined velocity;
- and
- means for integrating said error signal, and for inputting said integrated error signal as a control signal to a pilot valve.
Dependencies are inferred from the claim text.