OIL PRESSURE CONTROL DEVICE AND MALFUNCTION-ASSESSING METHOD THEREFOR

摘要

A release-side pressure adjustment valve (SL(i)) corresponds to one of the clutches (C1-C3) or the brakes (B1 or B2) that is released when gear position is changed. A waiting period tref is measured from when the release pressure command value (Prl(i)*) for said release-side pressure adjustment valve (SL(i)) falls to or below the OFF pressure Poff of an oil pressure switch (SW(i)) corresponding to said release-side pressure adjustment valve (SL(i)). The invention determines (Steps S210-S250) that a malfunction has occurred in the release-side pressure adjustment valve (SL(i)) when the oil pressure switch (SW(i)) is ON after the waiting period tref has elapsed.