u2218 x u2218 x x x u2218 x xn u2218 x x x x x u2218 x xo d x u2218 u2218 u2218 x x u2218 u2218 u2218 3rd u2218 u2218 u2218 x x x u2218 u2218 u2218 2nd u2218 u2218 x x u2218 x u2218 u2218 u2218 1st u2218 u2218 x x x u2218 u2218 x x______________________________________ in an automatic transmission having the foregoing gear train and hydraulic control circuit the pilot pressure of the c2 duty control valve 11 becomes zero by turning off the duty solenoid valve s2 for c2 in a case where there is a power on downshift kick down from the 3rd range to the 2nd range i e a case where the c2 hydraulic pressure is released and the b1 hydraulic pressure is introduced by way of example as a result the c2 duty control valve 11 is closed and the hydraulic pressure delivered to the clutch c2 becomes zero thereby releasing the clutch c2 at this time the path which transmits the input torque to the output shaft is interrupted and the gear train enters the neutral state consequently unless the hydraulic pressure of brake b1 starts rising at a point where turbine rotation and engine rotation are in synchronism namely at point x in fig3 the engine will rev up and the driver will experience an unpleasant sensation for example if the rise in the b1 hydraulic pressure is delayed by time u03b4t in fig3 engine rev up u03b1 equivalent to an engine speed u03b4n e occurs in fig3 n e represents engine rotational speed and n t denotes turbine rotational speed the latter is expressed by the.