Device for obtaining electrical energy from the exhaust heat of an internal combustion engine of a motor vehicle, and method for obtaining electrical energy from the exhaust heat of an internal combustion engine of a motor vehicle

摘要

Apparatus for obtaining electrical energy from the exhaust gas heat of an internal combustion engine of a motor vehicle, having a heat exchanger which is to flow through the exhaust gas of the internal combustion engine on the primary side and which is to be flowed through by secondary heat exchanger fluid, which in the heat exchanger during operation of the internal combustion engine to a first, high temperature and / or to bring pressure level. The device has at least one inlet and one outlet Laval nozzle, the inlet of which is to be connected to a secondary outlet of the heat exchanger, the outlet of which is directed to paddlewheels of a constant pressure turbine and which is dimensioned to feed the constant pressure turbine with steam of a low , Second temperature and / or pressure level than the first, high temperature and / or pressure level and a high flow rate. The apparatus further includes an electrical generator having a rotor coupled to the constant pressure turbine to be rotated therefrom and a stator having at least one stator winding from which to derive electrical power. Furthermore, the device has a condensation condenser which is adapted to liquefy steam which has performed work on the constant pressure turbine. The liquid obtained from this vapor by condensation is to be fed into a secondary-side inlet of the first heat exchanger.