System Description

HYDRAULIC CONTROL SYSTEM


System Description

Hydraulic control mechanism consists of trochoid type oil pump directly driven by the engine, hydraulic control valve controlling line pressure and gear shifting, and input signals.

LINE PRESSURE AND SECONDARY PRESSURE CONTROL
When an input torque signal corresponding to engine driving force is transmitted from ECM to TCM, TCM controls line pressure solenoid valve and secondary pressure solenoid valve to adjust to a correct oil pressure.

Normal Control
Optimize the line pressure and secondary pressure, depending on driving conditions, on the basis of the throttle position, the engine speed, the primary pulley (input) revolution speed, the secondary pulley (output) revolution speed, the brake signal, the transmission range switch signal, the lock-up signal, the voltage, the target gear ratio, the fluid temperature, and the fluid pressure.

Feedback Control
For the normal fluid control and the select fluid control, secondary pressure is detected for feedback control by using a secondary pressure sensor to set a high-precision secondary pressure.