18 LS430 − NEW FEATURES Clutch Pressure Control 1) Clutch to Clutch Pressure Control This control has been adopted for shifting from the 5th to 6th gear and from the 6th to 5th gear. Solenoid valves SL1 and SL2 are actuated in accordance with the signals from the ECM, and guides this output pressure directly to the control valves B 2 and C 3 in order to regulate the line pressure that acts on the B 2 brake and C 3 clutches. As a result, high response and excellent shift characteristics have been realized. 2 Sensor Signal ECM Input Speed Sensor Output Speed Sensor Throttle Position Sensor Mass Air Flow Meter ATF Temp. Sensors Engine Coolant Temp.
Sensor SL1 SL2 Clutch Control Valve Brake Control Valve C 3 B 2 C 3 B 2 OFF ON 5th 6th 6th 5th ON OFF Line Pressure 259LSK69 2) Clutch Pressure Optimal Control The ECM monitors the signals from various types of sensors, such as the input turbine speed sensor, allowing shift solenoid valves SLT and SL1 to minutely control the clutch pressure in accordance with engine output and driving conditions. As a result, smooth shift characteristics have been realized. Target rpm Change Ratio ECM Input Shaft rpm Transmission CPU Engine CPU Practical rpm Change Ratio Time Input Speed Sensor Output Speed Sensor ATF Temp.
Sensor Accumulator Control Valve Clutch/ Brake Pressure Solenoid Valve SLT, SL1 Output Shaft Torque Solenoid Drive Signal Time 259LSK17