NOVELTY - The internal combustion engine (310) has a waste heat recovery circuit (318) that includes waste heat recovery passages in cylinder head and engine block. A pump (54) and an exhaust heat exchanger (62) are respectively positioned along waste heat recovery circuit upstream and downstream to deliver working fluid through waste heat recovery circuit and to selectively receive exhaust gas flowing through an exhaust system (14) to an atmospheric vent (104). An energy conversion portion (26) is positioned along waste heat recovery circuit downstream from the waste heat recovery passages.    USE - Internal combustion engine of vehicle.    ADVANTAGE - Since the fluid passages are formed near high temperature areas of the engine, the working fluid is subjected to sufficient heat energy to vaporize the working fluid, the engine block and/or cylinder head is cooled, the fuel efficiency is improved. Since heat is transferred from the combustion process that occurs within engine along interface between cylinder head and engine block into the passages of waste heat recovery (WHR) circuit, less heat is transferred to the coolant flowing in coolant passages or chambers, the heat load on the coolant system of engine from the combustion process is reduced, and the parasitic load from the coolant system on engine and the efficiency of engine are improved. Since the heat exchange portion provides cooling to certain systems of engine and serves to heat the working fluid to permit the working fluid to drive energy conversion portion, the useful work or energy can be extracted from waste heat created by engine. Since the exhaust gas recirculation (EGR) boiler is placed ahead of the engine heat exchanger or cooler, the EGR gases can be cooled while raising the temperature of the working fluid. Since the on-off valves is the modulated valves capable of opening and closing, the amount of working fluid flowing through the valves can be adjusted rapidly. Since the engine heat exchanger is positioned internally within an engine main portion and/or a cylinder head of engine, the direct transfer of heat from within the engine main portion and/or cylinder head to the working fluid is permitted. Since the control system increases or decreases the flow of working fluid through the flow path portion, the cooling of EGR gas can be increased or decreased to optimize engine emissions. Since the downstream exhaust heat exchanger and EGR superheater provide sufficient heat transfer to the working fluid to finish the phase change from a liquid to a gas, the sufficient energy is provided for energy conversion device to operate efficiently.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a waste heat recovery system for an internal combustion engine.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the internal combustion engine.    Exhaust system (14)    Energy conversion portion (26)    Pump (54)    Exhaust heat exchanger (62)    Atmospheric vent (104)    Internal combustion engine (310)    Waste heat recovery circuit (318)