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Internal combustion engine system having a power turbine with a broad efficiency range

United States Patent

April 13, 2010
View the Complete Patent at the US Patent & Trademark Office
An engine system incorporating an air breathing, reciprocating internal combustion engine having an inlet for air and an exhaust for products of combustion. A centripetal turbine receives products of the combustion and has a housing in which a turbine wheel is rotatable. The housing has first and second passages leading from the inlet to discrete, approximately, portions of the circumference of the turbine wheel. The passages have fixed vanes adjacent the periphery of the turbine wheel and the angle of the vanes in one of the passages is different than those in the other so as to accommodate different power levels providing optimum approach angles between the gases passing the vanes and the blades of the turbine wheel. Flow through the passages is controlled by a flapper valve to direct it to one or the other or both passages depending upon the load factor for the engine.
Whiting; Todd Mathew (Waterloo, IA), Vuk; Carl Thomas (Denver, IA)
Deere & Company (Moline, IL)
11/ 838,645
August 14, 2007
GOVERNMENT RIGHTS IN PATENT This invention was made with government support under contract no. DE-FC26-05NT42422 awarded by the Department of Energy. The United States government has certain rights in this invention.