https://www.verticalmag.com/features/20112-flying-the-v-22-html/

The transition process is a game of finesse, gradually raising the nose attitude
while simultaneously rolling the nacelles to the downstops.
中略
Once the nacelles hit zero, the next step is to autobeep the rotor r.p.m. to
the cruise speed of 84 percent by briefly flipping the nacelle thumbwheel forward
and letting it spring back into position.

The sound and vibration levels drop significantly at this point
and the Osprey is flying with about a five- to seven-degree nose high platform
while accelerating through 200 KCAS all in about 15 to 20 seconds.

During transition, the flight controls switch from a helicopter to an airplane
based upon a speed schedule contained in the flight control computers.
Swashplate movements are reduced and the flaperons rise up
to become very large ailerons.
(One thing to note is that the TCL doesnt change its function;
it still controls the thrust vector by collectively changing the proprotor pitch.)