Browse Prior Art Database

CLOSED LOOP SOLENOID CONTROLLER

IP.com Disclosure Number: IPCOM000026620D
Original Publication Date: 1992-Dec-31
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 104K

Publishing Venue

Xerox Disclosure Journal

Abstract

A monitoring circuit to provide feedback on solenoid response time is disclosed. The addition of closed loop feedback to a solenoid control system, adds predictability to the system's response time. This predictability can be used to enhance the performance of time-critical applications. Compensation for response time increase due to solenoid heating or mechanism wear can be achieved by either advancing the timing of the actuation signal or by increasing the actuation voltage. Knowledge of when solenoid pull-in occurs is also used to enable an informed voltage reduction for a hold-in cycle, which in turn reduces overall energy consumption and destructive heat generation. Solenoid heating adversely affects response time as well as component life. Disclosed circuit 3, which is shown in Figure 1, monitors the current through solenoid 12 in order to provide a closed loop feedback control to its power supply in order to reduce the voltage for a hold-in cycle, thereby ensuring a reduction in energy (heat) to the solenoid and avert effects to its response time. An additional use for this capability is for diagnostic purposes. An "intelligent" control system can analyze response time trends and detect changes in the behavior of the solenoid or the attached load which might indicate a need for adjustment or repair.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

CLOSED LOOP SOLENOID CONTROLLER
Rober P. Siege1
Jacob N. Kluger

Proposed Classification

U.S. C1.361/139 Int. C1. HOlh 47/00

/ 10 Solenoid Power . -

Supply

Converter D/A d8 t6

 Digital Computer /

Controller

u.4 T /

I I

A/D Converter 4

R1

t

- -- 12

A

i'

FIG. I

XEROX DISCLOSURE JOURNAL Vol. 17 No 6 Xovember/Decernber 1992 477

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Page 2 of 2

CLOSED LOOP SOLENOID CONTROLLER (Cont'd)

A monitoring circuit to provide feedback on solenoid response time is disclosed. The addition of closed loop feedback to a solenoid control system, adds predictability to the system's response time. This predictability can be used to enhance the performance of time-critical applications. Compensation for response time increase due to solenoid heating or mechanism wear can be achieved by either advancing the timing of the actuation signal or by increasing the actuation voltage. Knowledge of when solenoid pull-in occurs is also used to enable an informed voltage reduction for a hold-in cycle, which in turn reduces overall energy consumption and destructive heat generation. Solenoid heating adversely affects response time as well as component life. Disclosed circuit 3, which is shown in Figure 1, monitors the current through solenoid 12 in order to provide a closed loop feedback control to its power supply in order to reduce the voltage for a hold-in cycle, thereby ensuring a reduction in energy (heat) to the solenoid and avert effects t...