Shift Phase - 2-1 Shift Phase 1
WARNING: This page is about a different variant/trim than selected.
| 1 - 1-2/4-5 SHIFT SOLENOID |
| 5 - 1-2/4-5 COMMAND VALVE |
| 2 - 1-2/4-5 OVERLAP VALVE |
| 6 - DRIVING CLUTCH K1 |
| 3 - 1-2/4-5 SHIFT PRESSURE SHIFT VALVE |
| 7 - HOLDING CLUTCH B1 |
| 4 - 1-2/4-5 HOLDING PRESSURE SHIFT VALVE |
| 8 - SHIFT PRESSURE REGULATING VALVE |
The 1-2/4-5 shift solenoid (1) is turned ON to apply shift pressure (p-S) to the end face of the 1-2/4-5 command valve (5). This allows the command valve to up-shift and the shift pressure coming from the 1-2/4-5 shift valve (3) is routed to the holding clutch B1 (7) via the command valve. See Fig 1.
Simultaneously, the pressure in the releasing clutch, K1 (6), is regulated at the 1-2/4-5 overlap valve (2). The pressure in the K1 clutch as it disengages is controlled during the shift phase depending on engine load, via the modulating pressure (p-MOD), and the shift pressure in clutch B1 (7). The increasing shift pressure in clutch B1, which also acts on the end face of the overlap valve, reduces the overlap pressure.