May 092013
 

As can be seen from figures 5 and 6, the CFC 208F control unit, before each gear change, activates the clutch (1) by a servo actuator and a solenoid valve (EV0) controlled by the control unit.

The control function of the gear shaft takes place in these steps:

  • Selection lever activation
  • Transmission of the selection lever position to the control unit
  • Activation of engagement lever
  • Transmission of the engagement lever position to the control unit

The components involved in the gear change are:

  • Selection actuator
  • Selection potentiometer
  • Wiring harness between selection potentiometer and sectioning connector
  • Selection solenoid valve EV3
  • Wiring harness between selection solenoid valve EV3 (gear selection range 1-2) and the sectioning connector
  • Selection solenoid valve EV4
  • Wiring harness between selection solenoid valve EV4 (gear selection range 5 – R) and the sectioning connector
  • Gear engagement actuator
  • Engagement potentiometer
  • Wiring harness between engagement potentiometer and sectioning connector
  • Engagement solenoid valve EV1 (to engage odd gears 1-3-5)
  • Wiring harness between engagement valve EV1 and the sectioning connector
  • Engagement solenoid valve EV2 (to engage even gears 2-4-R)
  • Wiring harness between engagement solenoid valve EV2 and sectioning connector.
Section of clutch control - gearbox actuators

Section of clutch control – gearbox actuators

Description

  1. Clutch control lever on gearbox
  2. Gear shaft (engagement and selection control)

Hydraulic System – Diagram

Hydraulic diagram

Hydraulic diagram

Description

  1. Engagement solenoid valve 1
  2. Engagement solenoid valve 2
  3. Selection solenoid valve 3
  4. Selection solenoid valve 4
  5. Clutch solenoid valve
  6. Electric pump
  7. Delivery filter
  8. (Don’t know what is this, please leave a comment if you know)
  9. Check valve
  10. Accumulator
  11. Oil tank
  12. Clutch actuator
  13. Engagement actuator
  14. Selection actuator
  15. Pressure sensor
 Posted by at 1:25 pm

  One Response to “Hydraulic System – Operation”

  1. Hello ,

    On the hydraulic drawing it shows the “Bypass Valve” (not numbered) this is normally a screw that bleeds system pressure back to the oil tank. As it is drawn it only bleeds down the pump pressure due to the “Check Valve”.

    The Accumulator and Pressure Sensor will remain under pressure !
    Is this correct as the same applies to the Ferrari F1 system but when the “Bypass Valve” is opened the Pump runs meaning it has bled down the complete pressure side including Accumulator and Pressure Sensor which would make some sense if working on the pressure side.

    Can anyone confirm its function and if the drawing is wrong ? Thanks in advance.