Jun 062013
 

The solenoid valves manage the oil flow to the actuator chambers.
All the valves are the three-way type, they are normally discharged when not controlled.

Proportional pressure solenoid valves (EV1 and EV2)

These control the oil pressure at the two chambers of the gear engagement-disengagement double-action actuator that has three set mechanical positions according to the control combination (even number gear, idling, odd number gear). The maximum flow rate is 7 l/min with pressure differential of 10 bar. The control current ranges from 0 to 2.5 A directly controlled by control unit CFC 208F. Electrical resistance of the winding is 2.5 Ohm +/- 6% at 20°C.

Position of solenoid valves and current pressure diagram

Position of solenoid valves and current pressure diagram

ON/OFF solenoid valves ( EV3 and EV4)

These feed the oil flow to the two chambers of the double action gear selection actuator that has only two set mechanical positions (1-2 and 5-R). The maximum flow rate is 1.4l/min with pressure differential of 10 bar. They are controlled with a voltage of 12V directly from control unit CFC 208F and absorb approx. 2A.
Electrical resistance of the winding is 5.1 Ohm +/-6% at 20°C.

On-Off solenoid valve position

On-Off solenoid valve position

Solenoid valves and actuators

The solenoid valves manage the oil flow to the actuator chambers.
All the valves are three-way; they are normally discharged if not controlled.

Proportional flow-rate solenoid valve (EV0)

It controls the oil inlet and outlet flow of the clutch stroke actuator chamber (single action).
The maximum flow rate is 10l/min with pressure differential of 10 bar. The control current ranges from 0 to 2A directly controlled by control unit CFC 208F. Electrical resistance of the winding is 2.5 Ohm +/- 6% at 20°C.

Solenoid valve position and flow rate/current diagram

Solenoid valve position and flow rate/current diagram

 Posted by at 4:15 pm