LINE PRESSURE CONTROLLER FOR V-BELT TYPE CONTINUOUSLY VARIABLE TRANSMISSION

摘要

PROBLEM TO BE SOLVED: To provide a line pressure control device capably of performing a line pressure control in which a V-belt shows no slip even in the case that an engine load is rapidly increased. SOLUTION: A time periodΔt1 ranging from a time t1 in which a throttle opening TVO is rapidly increased during a normal running operation to a time t2 in which a transmission ratio calculation value (i) is started to change as indicated by a booted line (b) is measured and it is discriminated that the V-belt is slipped in reference to a time measured time periodΔt1 is short than a corresponding time periodΔt0 in which no slip occurs in the V-belt. A line pressure PL is increased more than a normal value P0 byΔPL1 from this discriminating time t2 , thereby a movable flange of each of pulleys presses the V-belt more strongly, resulting in that that the V-belt is prevented from being slipped.