Hydraulic controller for automatic transmission having hydraulic power transmission with lockup device

Abstract

Abstract 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 of low or high temperature, while feeding a lockup valve with lockup signal hydraulic pressure through this select valve. CONSTITUTION:A temperature sensitive select valve 100, which sets up a shape memory alloy-make spring 108 at the one end side of a spool 104 and a spring 106 at the other end side and being selected according to temperature, is installed, while lockup signal hydraulic pressure is fed to a lockup valve 17 through this temperature sensitive 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 improved and, what is more, an engine stall is preventable from occurring.

Inventors

• 👤 Kazuhiko Sugano
• 👤 一彦 菅野

Bibliographic Details