Patent ID: 7721541
Filing Date: 2010-05-25
Classification: F02B,F02D,F02M

Abstract:
1. A method for providing exhaust gas to a lean burn diesel-fueled primary internal combustion engine having an EGR loop, an air boost device that delivers boost air via a charged air intake line, and a power crankshaft, for use by the engine to reduce NOx emissions, comprising: using a secondary internal combustion device to produce exhaust gas; wherein the secondary internal combustion device is separate from and auxiliary to the diesel-fueled primary internal combustion engine; wherein the secondary internal combustion device is operated at near stoichiometric combustion conditions; delivering substantially all of the exhaust from the secondary internal combustion device to only the diesel-fueled primary internal combustion engine, such that the diesel-fueled primary internal combustion engine receives a mixture of boosted fresh air and the exhaust from the secondary internal combustion device; the delivering step being performed by delivering the exhaust to an entry point on the charged air intake line; driving a secondary crankshaft with the secondary internal combustion engine; transferring power from the secondary crankshaft to the power crankshaft; operating the secondary crankshaft at a higher speed than the power crankshaft; and determining the amount of exhaust delivered from the secondary internal combustion device to the diesel-fueled primary internal combustion engine at least in part by means of the gearing of the secondary crankshaft.