Electrohydraulic control system for a rockdrill assembly
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United States of America Patent
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Jul 15, 1986
Grant Date -
N/A
app pub date -
Jan 7, 1983
filing date -
Jan 11, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electrohydraulic control system for an arm assembly of the type described in U.S. Pat. No. 4,364,540 utilizes an electric computer (microprocessor) which receives a nonlinear or harmonic signal from the rotary hydraulic motor of the arm of this assembly and converts the harmonic signal into a linear signal which is applied to a comparator as the value signal for comparison with a command signal from the computer. Similar comparators are provided for each of the hydraulic operators and the sensors thereof can provide direct actual value inputs to these comparators.
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