CONTROLLER FOR CONTINUOUSLY VARIABLE TRANSMISSION FOR VEHICLE

摘要

PURPOSE:To improve the drive feeling by controlling the speed change ratio of continuously variable transmission during speed change of sub-speed change section. CONSTITUTION:It is decide whether speed change signal is inputted from sub- speed change section (step 164) and proceeds to following steps only when it is inputted. Then it is decided whether speed change in sub-speed change section is down shift or up shift (step 166) while actual input side rotary speed Min is compared with target input side rotary speed Nino (steps 168, 170) thus to control first and second solenoid valves. In case of (a), for example, two solenoid valves are turned off to feed oil slightly to input side hydraulic cylinder at CVT section through an orifice thus to perform quite slow up shift of CVT section. This condition will continue upto the end of speed change of sub-speed change section (steps 180, 182).