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
An injection molding system configured to operate in a plurality of cycles includes, 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.
Claims23
A method for controlling an injection molding system to optimize an efficiency of the injection molding system, wherein the injection molding system includes a pump assembly, a system pressure and at least one component pressure, the method comprising:
- (a) controlling the pump assembly to allow for operation of the injection molding system at a predetermined first system pressure set by a controller for a predetermined number of baseline cycles;
- (b) measuring a baseline performance of the injection molding system with one or more sensors during the baseline cycles;
- (c) comparing an accumulator pressure with an accumulator pressure limit;
- (d) based on the baseline performance and the accumulator pressure, setting a second system pressure value as a target pressure value;
- (e) setting a variable pressure setpoint equal to a third system pressure value;
- (f) comparing the variable pressure setpoint to the target pressure value;
- and
- (g) controlling the pump assembly to change the variable pressure setpoint to a value approaching the target pressure value, wherein an amount of change is determined based on a difference between the variable pressure setpoint and the target pressure value.
Dependencies are inferred from the claim text.