When the 1-2 and 4-5 shift solenoid valve (1) is turned on, the shift valve pressure (p-SV) is directed onto the end
face of the command valve (5). The command valve is moved and the shift pressure (p-S) coming from the shift
pressure shift valve (3) is directed via the command valve (5) onto clutch K1 (6).
Simultaneously the clutch B1 (7) is subjected to overlap pressure by the overlap regulating valve (2). The pressure
in the clutch B1 (7) as it disengages is controlled during the shift phase depending on engine load by the modu-
lating pressure and the applying clutch pressure (the shift pressure in clutch K1). The controlled pressure in clutch
B1 (7) is inversely proportional to the capacity of the clutch being engaged. The rising shift pressure (p-S) at 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.
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AUTOMATIC TRANSMISSION - NAG1 - SERVICE INFORMATION
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