Patent ID: 8677751

Claim:
A method of improving performance of an engine system, wherein said engine system comprises: an engine, a super-turbocharger that is both mechanically driven by said engine and driven by exhaust gases from said engine comprising: a catalytic converter connected to an exhaust conduit proximate to an exhaust outlet of said engine such that pollutants in hot exhaust gases from said engine are reduced and said catalytic converter produces converted exhaust gases, a compressor of said super-turbocharger connected to a source of air so that said compressor provides a supply of compressed air to a compressed air conduit that is coupled to an intake of said engine, a throttle in said compressed air conduit to increase pressure levels of said compressed air to a level that is greater than exhaust gas pressure levels, and a compressed cooling air conduit connected to said compressed air conduit so that said compressed air cooling conduit supplies a portion of said supply of compressed air, upstream from said throttle, to said converted exhaust gases so that said portion of said supply of compressed air is mixed with said converted exhaust gases to produce a gaseous mixture; the method comprising: supplying said gaseous mixture to a turbine that is mechanically coupled to said compressor so that turbine rotational mechanical energy is generated by said turbine from said gaseous mixture; generating a control signal from a controller that regulates said portion of said compressed air that is mixed with said converted exhaust gases to maintain said gaseous mixture below a maximum temperature; operating said engine with a fuel mixture to at least create a stoichiometric mixture; wherein a transmission is connected to said compressor and provides propulsion train rotational mechanical energy from a propulsion train of said engine to said compressor to reduce turbo-lag when said flow of said gaseous mixture through said turbine is not sufficient to drive said compressor to a desired boost level, and extracts excess turbine rotational mechanical energy from said turbine that is applied to said propulsion train.