An electric turbo-compound (ETC) system is defined where a turbine coupled to a generator (turbogenerator) is located in the exhaust gas flow of a reciprocating engine to harvest waste heat energy and convert it into electrical power.
An example of an ETC system is where a turbogenerator is located downstream of a turbocharger turbine of an internal combustion engine (ICE).
[1] ETC systems are commercially available for stationary power gensets and at an advanced stage of development for automotive applications to improve the fuel efficiency of gas and diesel engines by recovering waste energy from the exhaust gases.
[2] The ETC system is typically located downstream of the turbocharger of an ICE.
For automotive application the ETC would become the primary generator used to power the vehicle’s auxiliary systems.