Valve opening and closing control apparatus

Details Valve opening and closing control apparatus Valve opening and closing control apparatus

2011-05-31

2011-05-31

Fristoe, Jr., John K (Department: 3753)

Valves and valve actuation

Electrically actuated valve

Remote or follow-up control system for electrical actuator

C251S305000

Reexamination Certificate

active

07950623

ABSTRACT:
When a control unit variably controls an electric power supplied to an electric motor to repeat a valve opening and closing movement of a valve between a first intermediate position and a second intermediate position through a neutral position, the control unit initially sets the neutral position as a control target value until a valve position, which is sensed with a valve opening degree sensor, is located immediately before the neutral position. The control unit thereafter changes the control target value to the first intermediate position or the second intermediate position when the control unit determines that the valve position, which is sensed with the valve opening degree sensor, reaches the neutral position.

REFERENCES:
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patent: 6622984 (2003-09-01), Rauch et al.
patent: 7168682 (2007-01-01), Nanba et al.
patent: 7234444 (2007-06-01), Nanba et al.
patent: 2003-314377 (2003-11-01), None

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