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High efficiency stoichiometric internal combustion engine system

United States Patent

June 2, 2009
View the Complete Patent at the US Patent & Trademark Office
A power system including a stoichiometric compression ignition engine in which a roots blower is positioned in the air intake for the engine to control air flow. Air flow is decreased during part power conditions to maintain the air-fuel ratio in the combustion chamber of the engine at stoichiometric, thus enabling the use of inexpensive three-way catalyst to reduce oxides of nitrogen. The roots blower is connected to a motor generator so that when air flow is reduced, electrical energy is stored which is made available either to the roots blower to temporarily increase air flow or to the system electrical load and thus recapture energy that would otherwise be lost in reducing air flow.
Winsor; Richard Edward (Waterloo, IA), Chase; Scott Allen (Cedar Falls, IA)
Deere & Comapny (Moline, IL)
11/ 748,861
May 15, 2007
GOVERNMENT RIGHTS IN PATENT This invention was made with Government support under contract DE-FC26-05NT42416 awarded by the Department of Energy. The United States Government has certain rights in this invention.