Patent ID: 7904196
Filing Date: 2011-03-08
Classification: B29C

Abstract:
1. An apparatus for controlling pressure in an electric injection molding machine, comprising: an observer arithmetic unit operative to derive an estimated melt pressure value δ^, based on an observer, from an angular velocity ω of a motor operative to propel forward a screw in an injection molding machine and a torque command value T a torque arithmetic unit operative to calculate said torque command value T said observer arithmetic unit comprises: a first and second adders operative to subtract the angular velocity ω from an estimated angular velocity value ω^ a first and a second adjusters operative to adjust an output value (ω^ a third adder operative to add the torque command value T a fourth adder operative to add an output value (T a third adjuster operative to adjust an output value (T a fifth adder operative to add outputs from the first and third adjusters; a first integrator operative to integrate an output from the fifth adder to obtain an estimated angular velocity value ω^; and a second integrator operative to integrate an output from the second adjuster to obtain the estimated melt pressure value δ^.