DEVICE FOR RECOVERING ELECTRIC ENERGY FROM THE EXHAUST HEAT OF AN INTERNAL COMBUSTION ENGINE IN A MOTOR VEHICLE AND METHOD FOR RECOVERING ELECTRIC ENERGY FROM THE EXHAUST HEAT OF AN INTERNAL COMBUSTION ENGINE IN A MOTOR VEHICLE

摘要

Device for recovering electrical energy from the exhaust heat of a combustion engine of a motor vehicle, with a heat exchanger, through which the exhaust gas of the combustion engine is to flow on the input side, and through which heat exchanger fluid, which in operation of the combustion engine is to be brought in the heat exchanger to a first, high temperature and/or pressure level, is to flow on the output side. The device has at least one Laval nozzle, which has an inlet and an outlet, the inlet of which is to be connected to an output-side outlet of the heat exchanger, the outlet of which is directed onto turbine blade wheels of a constant-pressure turbine, and which is dimensioned so that it loads the constant-pressure turbine with steam which has a lower second temperature and/or pressure level than the first, high temperature and/or pressure level and has a high flow velocity. The device also has an electrical generator, which has a rotor which is coupled to the constant-pressure turbine and is to be put into rotation by it, and a stator with at least one stator winding, at which electrical power is to be taken. The device also has a condensation cooler, which is set up to liquefy steam which has done work on the constant-pressure turbine. Liquid which is obtained from this steam by condensation must be fed into an output-side inlet of the first heat exchanger.