HYDRAULIC CONTROL DEVICE AND ITS ABNORMALITY DETERMINATION METHOD

PROBLEM TO BE SOLVED: To determine the presence and absence of an abnormality of a pressure regulating valve concerned in a speed change during a change of a speed change gear.SOLUTION: When a hydraulic switch SW (i) is turned on at a time point when a standby time tref elapses after a release press...

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Bibliographische Detailangaben
Hauptverfasser:	TASHIRO MUNEHIRO, JINNO TOMOYA, ISHIKAWA KAZUNORI, YAMAGUCHI MASAJI, SHIMIZU TETSUYA
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING ENGINEERING ELEMENTS AND UNITS GEARING GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LIGHTING MECHANICAL ENGINEERING THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To determine the presence and absence of an abnormality of a pressure regulating valve concerned in a speed change during a change of a speed change gear.SOLUTION: When a hydraulic switch SW (i) is turned on at a time point when a standby time tref elapses after a release pressure command value Prl(i)* to the release-side pressure regulating valve SL(i) corresponding to one of clutches C1 to C3 which are released when the speed change gear is changed, and brakes B1 and B2 reaches a value not higher than the off-pressure Poff of the hydraulic switch SW(i) corresponding to the release-side pressure regulating valve SL(i), it is determined that the abnormality has occurred in the release-side pressure regulating valve SL(i) (steps S210 to S250).