发明名称 |
Electrohydraulic valve servomechanism with adaptive resistance estimator |
摘要 |
A servomechanism includes a controller which dynamically estimates the resistance of the solenoid coil in an electrohydraulic valve as part of determining a level of electric voltage to apply to open the valve. The servomechanism receives a current setpoint designating a desired electric current level and senses the actual level of current flowing through the coil. A proportional term is derived from the current setpoint and the actual level of current. Creation of a derivative term is based on the difference between the current setpoint and the actual level of current. A feedforward term is produced by estimating the resistance of the electrohydraulic valve and limiting the feedforward term to a predefined range of acceptable values. The proportional term, derivative term, and the feedforward term are summed to define a desired voltage level, and a PWM signal for driving the electrohydraulic valve is generated based on the desired voltage level.
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申请公布号 |
US2005211936(A1) |
申请公布日期 |
2005.09.29 |
申请号 |
US20050083585 |
申请日期 |
2005.03.18 |
申请人 |
HUSCO INTERNATIONAL, INC. |
发明人 |
TABOR KEITH A.;PFAFF JOSEPH L. |
分类号 |
F15B11/04;E02F9/22;F15B11/00;F15B19/00;F15B21/08;F16K31/02;F16K37/00;G05D7/06;(IPC1-7):F16K31/02 |
主分类号 |
F15B11/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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