Maybe this will help...
Basically, shifting is done using two solenoids (to open and close two valves). They are controlled by the "computer governor" (GC), which receives input from a signal generator (for output shaft RPM input), a multifunction switch (for operator selected gear input), a "governor cable" (for operator selected acceleration level input), a micro switch (for operator selected downshift request input).
Let's go for a ride...
When you are sitting in gear, both solenoids are ON (1st gear).
Floor it!...
As you continue to accelerate, the generator outputs more voltage. The GC sees the rise in voltage and turns off solenoid A (now 2nd gear). The load on the engine raises so the RPMs and the generator's output voltage drop back down. Continuing to accelerate, the GC sees another rise in RPMs and turns off solenoid B (now 3rd gear).
Cruising...
The generator's input is combined with the governor cable's input to determine the point to turn a solenoid on/off (engine load versus demand).
Passing...
Putting the pedal to the floor closes the kickdown microswitch (
request for it to override the GC). The GC will turn a solenoid ON (B then A), iff it is safe to do so.
If you haven't, check out:
https://dmctalk.org/showthread.php?3...ssion-Governor
R4141EC.jpg