Variable displacement transmission pump and controller with adaptive control
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United States of America Patent
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Jan 23, 2018
Grant Date -
Aug 13, 2015
app pub date -
Feb 3, 2015
filing date -
Feb 11, 2014
priority date (Note) -
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Abstract
A variable displacement transmission pump having a controller for adjusting the displaced volume, which controller actuates corresponding adjuster actuators of the adjustable pump via a control valve, so that the pump can be adjusted from minimum to maximum displaced volume in order to achieve a constant pump outlet pressure for supplying a hydraulically operated transmission, wherein for different operating points of both the adjustable pump and the transmission, the input variables of the controller are adjusted in such a way that, independently of the individual operating points, the overall damping of the control system comprising pump and transmission—that is, using corresponding influence variables from these systems—can be maintained substantially constant under variable operating conditions by means of adjustable controller amplification.
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