US Patent: 4,790,233
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| Method and Apparatus for Controlling Hydraulic Systems
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Patentees:
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| Bengt S. Backe (exact or similar names) - Dundee, IL |
| La Moyne W. Durham (exact or similar names) - Bartlet, IL |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jul. 18, 1987 |
| Granted: |
Dec. 13, 1988 |
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Joel Havens
South Bend Lathe History
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Description: |
| Thomas J. Dodd - patent attorney
This is a divisional of application Ser. No. 647,158 filed Sept. 4, 1984 now U.S. Pat. No. 4,706,456 issued 11/17/87.
Abstract
A control system is provided for a hydraulic actuating system having a multi-phase stepping motor with a driver therefor which supplies and controls DC current through each of the motor windings such that no current is induced into the control winding from adjacent windings. The stepping motor precisely controls the rotation of an eccentric cam engaging an actuating plunger which actuates a control valve of the hydraulic actuating system. The driver receives control signals from a computer programmed to calculate, from user input command signals indicative of the desired system condition, and generate those control signals which most quickly achieve a rough approximation of the desired system condition. After this rough approximation is attained, the computer generates new control signals for the driver as a function of feedback signals and/or system component characteristics so as to precisely achieve the desired system condition.
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