ELECTRICAL AUTOMATIC SHIFT CONTROL SYSTEM WITH HILLY COUNTRY DETECTING UNIT

摘要

The present invention relates to an electrical automatic shift control system with a hilly country detecting unit which is adapted for use with an automatic transmission for automobiles comprising a fluid type torque converter transmission with a speed change gear, friction engaging means for accomplishing shifting gear engagements of the speed change gear, and a hydraulic actuation circuit for controlling the friction engaging means. The automatic shift control system comprises a climbing road condition logic circuit, a downhill road condition logic circuit and a memory circuit, whereby it functions such that the control unit of the torque converter for effecting normal automatic gear changes in a hilly country is properly restrained from changing to top gear thereby automatically and easily preventing the transmission from changing to top gear on inclines and declines and on curved roads, while this hilly country driving condition is released upon changing into level road running.