GF27.60-P-3009AHV Engage Gear Range, Function

GF27.60-P-3009AHV Engage Gear Range, Function
- TRANSMISSION 722.930 in MODEL 204.0 /2 /3

Function requirements for Engage gear range, general

^ Circuit 87 (connected circuit 15) ON
^ Circuit 61 (engine running)

Engage gear range, general

Each gear change is triggered by the fully integrated transmission control system. In the process one component group is assigned to each shift operation.

One component group consists of the respective control solenoid valve, the regulating valve involved, the responsible shift valve and the required multidisk brake or required multidisk clutch.

The pressure in the multidisk brake or multidisk clutch to be engaged is increased constantly while at the same time the pressure in the multidisk brake or multidisk clutch to be disengaged is reduced. This involves a flowing transition. Despite this the affected components are directly actuated and therefore enable shifting down through several gears.

Function sequence for engage gear range

Shift operation N to D (1st gear)

In the "N" selector lever position of the electronic selector lever module control unit (N15/5) the multidisk brake B3 and multidisk clutch K3 are engaged. By shifting from selector lever position "N" into selector lever position "D" on the electronic selector lever module control unit the feed to the multidisk brake B2 is enabled by the selector valve. The fully integrated transmission control unit (Y3/8n4) actuates the multidisk brake control solenoid valve B2 (Y3/8y6) and the multidisk brake B2 is filled with oil.

From the rpm difference (actual slip) of engine speed to turbine speed the fully integrated transmission control unit detects whether the multidisk brake B2 is filled.

The multidisk brake control solenoid valve B2 actuates the regulating valve B2 and brake pressure regulation which converts the adjacent working pressure into shift pressure and passes it on to the multidisk brake B2

In the fully integrated transmission control unit, the required slip (specified slip) is stored for the respective gear. The control pressure on regulating valve B2 or BR is changed via multidisk brake control solenoid valve B2 depending on this. The shift pressure produced by the regulating valve B2/BR depends on the geometry of the regulating valve B2/BR. The pressure in multidisk brake B2 is changed until the specified slip stored in the fully integrated transmission control unit is reached.