Drive unit with a fuel engine and a non-regulated self-actuating piston engine

摘要

A reciprocating piston expansion engine has a piston (5) that is arranged in each cylinder (1). An inlet valve (2) of the cylinder is opened so as to provide fluid in vaporous form/gaseous form to cylinder from a supply unit (9). A bypass valve (3) is arranged in parallel to the inlet valves so as to provide fluid to the interior space (6) of the cylinder when the inlet valve is in closed state. A crankshaft (8) is coupled to the piston of the expansion engine. A freewheel is coupled to the crankshaft for transmitting torque to a drive shaft of a combustion engine. An independent claim is also included for method for operating drive unit.