Hydraulic pressure control apparatus
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United States of America Patent
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May 20, 2014
Grant Date -
Sep 15, 2011
app pub date -
Mar 10, 2011
filing date -
Mar 11, 2010
priority date (Note) -
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Abstract
A hydraulic pressure control apparatus has an electromagnetic valve having a valve body forced to one side by an elastic member and a coil driving the valve body to the other side; a hydraulic pressure control section for calculating a command current value to drive the electromagnetic valve and controlling a hydraulic pressure in a hydraulic circuit by opening/closing the electromagnetic valve; a current detection section detecting a value of the current passing through the coil; and a command current value correction section. The command current value correction section detects a change of an inductance of the coil when the valve body moves from the one side to the other side or from the other side to the one side through the current detection section, and corrects the command current value using the detected inductance change.
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