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Exercise Devices

Reset-windup-limiting

Volume calculator for incentive spirometer

OF THE PREFERRED EMBODIMENT FIGS. 1 through 5 show how the device of the present invention is ...

Collapsible respiratory exerciser

The collapsible respiratory exerciser of the present invention is designed to meet the ...

Portable exercise device

OF THE PREFERRED EMBODIMENT FIG. 1 illustrates a portable, resistive-type exercise device of the ...

Exercising apparatus

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Exercise tower and bench

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Basketball return

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Arrangement for converting reciprocating motion into even rotational motion

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Video tape editor with fade control functions

Accordingly, it is a general object of the present invention to provide an improved video tape ...

Video editing by locating segment boundaries and reordering segment sequences

OF THE PREFERRED EMBODIMENT Referring to FIG. 1, a typical system providing the environment for ...

Reset windup limiting

Details

Inventors: Hawkins, Royal R.;
Assignee: Honeywell Inc. (Minneapolis, MN)
Primary Examiner: Smith, Jr.; David
Assistant Examiner:
Attorney, Agent or Firm: Joike; Trevor B.

A proportional control system for controlling a condition at a setpoint is disclosed wherein the system has reset for substantially reducing system droop and incorporates reset windup limiting, the system having a setpoint apparatus for establishing the setpoint for the system, a feedback circuit for supplying a feedback signal in accordance with the condition, a reset circuit connected to both the setpoint apparatus and the feedback circuit for substantially reducing system droop, the reset circuit for supplying a reset output signal, and the reset circuit having a reset windup limiting circuit for limiting reset windup of the reset circuit.

DETAILED DESCRIPTION In the example shown in the drawing, the condition being controlled by control system 10 is motor speed.
Control system 10 comprises a setpoint apparatus in the form of potentiometer 11 having a resistance element 12 connected between a source of positive potential and ground and a wiper arm 13 connected to one input of the reset and control circuit the other input of which receives the feedback signal over feedback line 56.
Specifically, wiper arm 13 is connected through resistor 61 to the negative input of amplifier 14 the output from which is connected back to its negative input through feedback resistor 15.
The output of amplifier 14 is also connected through reset gain potentiometer 16, connected in rheostat fashion, to the negative input of amplifier 17.
The positive input terminal of amplifier 17 is connected to a voltage divider comprising resistors 18 and 19 connected between a positive voltage source and return.
The output of amplifier 17 is connected through resistor 22 to junction 23.
Junction 23 is connected through series connected feedback resistor 24 and capacitor 25 to the negative input of amplifier 17.
The series circuit of resistor 24 and capacitor 25 provides the integration function for integrating amplifier 17.
Junction 23 is also connected through potentiometer 29 which has a resistive element 30 one side of which is connected to junction 23 and the other side of which is connected to return.
Potentiometer 29 also has a wiper arm 31 connected to the positive input terminal of amplifier 32 the output from which is connected to its negative input through resistor 33.
Potentiometer 29 is used to calibrate the system and resistor 24 is used to establish the proportional gain of the proportional control system 10.
Valve 34, which may take the form of a V7058 servovalve manufactured by Honeywell Inc.
, is used to connect the abovedescribed reset and control circuit to the load in the form of motor 41.
Valve 34 operates in response to the output from amplifier 32 for controlling the flow of fluid from an inlet supply line 35 to outlet lines 36 and 37 and return line 38

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