Shift Phase

Via the 1-2 and 4-5 shift solenoid (1), the shift valve pressure (p-SV) is directed onto the end face of the command valve (5). The command valve (5) is moved and the shift pressure (p-S) coming from the shift pressure shift valve (3) is directed via the command valve (5) onto driving clutch K1 (6). Simultaneously the multi-disc holding clutch B1 (7) is subjected to overlap pressure by the overlap valve (2).

Fig 1: 1-2 Shift - Shift Phase

Courtesy of DAIMLERCHRYSLER CORP.

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 - MULTI-DISC HOLDING CLUTCH B1
4 - 1-2/4-5 HOLDING PRESSURE SHIFT VALVE

The multi-disc holding clutch B1 (7) pressure acting on the end face of the shift pressure shift valve (3) is replaced by the working pressure (p-A). The rising shift pressure (p-S) at driving clutch K1 (6) acts on the annular face of the overlap regulating valve (2) and reduces the overlap pressure regulated by the overlap regulating valve (2). When a corresponding pressure level is reached at the holding pressure shift valve (4), this valve switches over.