Ali Sadighi

US Patent:

20130298874, Nov 14, 2013

Filed:

Apr 2, 2013

Appl. No.:

13/855363

Inventors:

Ke Li - Minneapolis MN, US
Ali Sadighi - Redondo Beach CA, US

International Classification:

F02B 71/00

US Classification:

123 46 A

Abstract:

Motion control of a hydraulic free-piston engine is achieved in order to enable advanced combustions such as low temperature combustion. To accomplish this, an active controller acts as a virtual crankshaft, which causes a piston to follow a reference trajectory using energy from a storage element. Given the periodic nature of free-piston engine motion, an advanced controller of the present invention is preferably of robust repetitive type that is capable of tracking periodic reference signals.