HYDRAULIC CONTROLLER FOR AUTOMATIC TRANSMISSION HAVING HYDRAULIC POWER TRANSMISSION WITH LOCKUP DEVICE

摘要

PURPOSE:To improve a feeling of driving comfortableness, by installing a temperature sensitive select valve which is selected by a feeler member being phase- changed in time low or high temperature, while selecting a lockup valve with signal hydraulic pressure out of the select valve. CONSTITUTION:A temperature sensitive select valve 100, which sets up a feeler member 108 being phase-changed according to oil temperature of a shape memory alloy-make spring or the like to one end of a spool 104 and a spring 106 to the other end and being selected according to temperature, is installed, while a lockup valve 17 is selected by signal hydraulic pressure out of this temperature select valve 100. With this constitution, in a state that temperature is low immediately after engine starting, it is possible that a lockup device is no longer operated so that a feeling of driving comfortableness is well improved and, what is more, an engine stall is preventable from occurring.