Stabilized adaptive hydraulic system pressure in an injection molding system
AssigneeHusky Injection Molding Systems Ltd.
InventorsWeichun Yu, Gregory Allan Schultz
Life of this patent
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Abstract
In one aspect, there is provided an injection molding system configured to operate in a plurality of cycles. The system comprises, amongst other things, a controller that is configured for performing a comparison of a variable pressure setpoint with a target pressure value. The controller is configured to, when the target pressure value is less than the variable pressure setpoint by at least a predetermined lower bound, (i) decrease the variable pressure setpoint to a reduced variable pressure setpoint and (ii) not further decrease the variable pressure setpoint from the reduced variable pressure setpoint until the pump assembly operates for a plurality of stabilizing cycles at the reduced variable pressure setpoint.
Claims17
A pressure control system for an injection molding system, the pressure control system comprising:
- a variable displacement pump;
- a pump control valve;
- a sensor configured to detect a hydraulic pressure within the pump control valve;
- a controller configured to operate and control the pump control valve in response to a signal from the sensor;
- a pump actuator configured to increase or reduce an output of the variable displacement pump;
- and
- a variable pressure setpoint determined by the controller, wherein the variable pressure setpoint corresponds to a magnitude of the hydraulic pressure within the pump control valve, and wherein the pump control valve is configured to change the variable pressure setpoint based on a flowrate of hydraulic fluid coming out of the pump control valve;
- and wherein the variable pressure setpoint governs system pressure.
Dependencies are inferred from the claim text.