AUTOMATIC ELECTRONIC CONTROL TRANSMISSION

摘要

PURPOSE:To permit high accuracy speed change control as a whole by carrying out shift-up on the basis of characteristics of rotation-load of an engine and shift-down on the basis of characteristics of turbine rotation-engine load. CONSTITUTION:An input/output unit 201 of an electronic control circuit 200 processes respective signals of a load sensor 207 for generating load signals, a sensor 208 for sensing the rotational frequency of an engine to generate the rotational frequency signals of the engine, a sensor 209 for sensing the rotational frequency of a turbine to generate the rotational frequency signal of the turbine and a mode sensor 210 for detecting travelling mode signals to send these signals to RAM 202. CPU 203 computes whether or not speed change should be carried out with reference to shift-up speed change line determined on the basis of characteristics of the rotational frequency-load of an engine and shift-down speed change line determined on the basis of characteristics of the rotational frequency of a turbine-engine load. The result of computation of CPU 203 is given as signals for controlling excitation of a solenoid valve group 211 for operating a speed change controlling valve through the input/output unit 201.