NOVELTY - The system has a heat exchange part for receiving exhaust heat of an internal combustion engine (10) and heating working medium. An electric power generation part generates electric power based on motive power obtained by the working medium heated in the heat exchange part. Another heat exchange part cools the working medium that is swelled in the electric power generation part. A booster pump (41) sends the cooled working medium into the former heat exchange part. A temperature sensor (61) measures temperature of cooling water that flows in or flows out in the engine.    USE - System for producing electric power using exhaust heat of an internal combustion engine of a motor vehicle.    ADVANTAGE - The system allows heat of the engine to get across to the working medium directly so as to improve efficiency of heat exchange, thus heightening electric power generation output. The system allows a radiator to be independently provided on a path of the cooling water and to be cooled by air with an air cooling fan, so that engine cooling can be reliably maintained by using the radiator when cooling by the system is inadequate. The motive power is converted into electrical energy such that heat of the engine forcedly thermally radiated, can be converted into the electrical energy and utilized unconditionally, so that effective usage of an energy resource can be aimed, thus reducing environmental loads and suppressing increase in number of parts of the system.    DETAILED DESCRIPTION - The former heat exchange part is an evaporator (21). The latter heat exchange part is a condenser (22). The electric power generation part is a unit containing an expander (31) and a generator (32). The working medium is fluorocarbon gas.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a structure of an exhaust heat electric power generation system. '(Drawing includes non-English language text)'    Internal combustion engine (10)    Evaporator (21)    Condenser (22)    Expander (31)    Generator (32)    Booster pump (41)    Temperature sensor (61)