Patent ID: 7574982

Claim:
A 4 Stroke cycle change engine where a usual 4 Stroke cycle is extended to 8 strokes, when less than half load is needed, by adding ‘air only’ induction, ‘air only’ compression, ‘air only’ expansion and ‘air only’ exhaust strokes between usual combustion 4 stroke cycles provided by alternate opening fuel/air and ‘air only’ inlet valves operated by Electro-Magnetic, Electro-Hydraulic or other electrically controlled means and where the electronic control of the inlet valves also opens all inlet valves on all induction strokes to deliver maximum power in 4 stroke mode, the control also provides different inlet valve timings for adjacent fuel/air inlet strokes and the intervening ‘air only’ inlet strokes for steady loads less than full load in both 4 stroke and 8 stroke modes.