AUTOMATIC TRANSMISSION SYSTEM

Shift Solenoid Valves SL1, SL2, SL3, SL4, SL5, SLU (Lock Up Control Solenoid Assembly) and SLT (Line Pressure Control Solenoid Assembly)

1. In order to provide a hydraulic pressure that is proportional to the current that flows to the solenoid coil, shift solenoid valves SL1, SL2, SL3, SL4, SL5, SLU (Lock Up Control Solenoid Assembly) and SLT (Line Pressure Control Solenoid Assembly) linearly control the line pressure and clutch and brake engagement pressure based on the signals from the TCM.

2. The shift solenoid valves SL1, SL2, SL3, SL4 and SL5 are large flow linear solenoid valves that can supply more pressure than conventional ones. These shift solenoid valves control engagement elements by directly regulating the line pressure without using the pressure regulation valve or the pressure reduction valve. Thus, the number of valves and the length of the valve body fluid passage have been reduced, the shifting response has been improved and the shift shock has been minimized.

   Figure 1. Shift Solenoid Valve SL1, SL3, SL4 and SL5

   

   *1	Spool Valve
   *2	Hydraulic Pressure
   *3	Current
   *4	Sleeve

   Figure 2. Shift Solenoid Valve SL2

   

   *1	Spool Valve
   *2	Hydraulic Pressure
   *3	Sleeve
   *4	Current

   Figure 3. Shift Solenoid Valve SLU (Lock Up Control Solenoid Assembly)

   

   *1	Spool Valve
   *2	Hydraulic Pressure
   *3	Sleeve
   *4	Current

   Figure 4. Shift Solenoid Valve SLT (Line Pressure Control Solenoid Assembly)

   

   *1	Spool Valve
   *2	Hydraulic Pressure
   *3	Sleeve
   *4	Current