PA-24 Comanche
Flight Crew Private; Flight Crew Instrument
Flight Crew Last 90 Days 3; Flight Crew Total 1344; Flight Crew Type 1017
Deviation - Altitude Excursion From Assigned Altitude; Deviation - Track / Heading All Types; Inflight Event / Encounter Loss Of Aircraft Control; Inflight Event / Encounter Weather / Turbulence
Flight Crew Returned To Clearance; Flight Crew Regained Aircraft Control
Weather
I was receiving VFR vectors from Cleveland Approach in the CLE Class B airspace to transition from the south side of the Class B to BKL (Burke Lakefront Airport) in the northern portion of the Class B.  Weather was VFR with continuous moderate to occasionally severe chop.  Traffic was not a factor.  No traffic was called to me and only one target (at 10 miles) showed on the ADSB while in the Class B.  I was cleared at 3;500' with heading changes as necessary.  The aircraft was on autopilot.  At approximately IXORE intersection; I hit some extreme turbulence. The aircraft rolled more that 90 degrees right; altitude increased violently; then decreased violently leaving a net gain of 600' and a heading deviation of 40 degrees right.  This all happened simultaneously.  The autopilot disconnected; whether from exceeding its limitations or my hand hitting the disconnect switch; I don't know.  My first reaction was to roll level and then start a turn back to the proper heading and a descent down to the correct altitude.  The Controller asked if I needed any assistance. I declined as I was very busy.  Back on heading and altitude; I explained to the Controller what had happened.So far as I know; there was no loss of separation.  However; for a few seconds I had absolutely no control over the aircraft.  The experience was what I have always thought a wake turbulence encounter would be like; although I doubt that this was the case here because of the lack of other traffic.The one change I will make in my procedures because of this is to keep my seat belt even tighter.
PA-24 pilot reported loss of control for several seconds in severe turbulence that resulted in track and altitude excursions before control was regained.