Abstract: A coolant circulation system for an internal combustion engine includes an exhaust gas recirculation system coolant circuit and a cabin heating circuit. The exhaust gas recirculation system coolant circuit includes a heat exchanger to extract heat from exhaust gases into the engine coolant. The cabin heating circuit includes a heat exchanger for sinking heat into a vehicle cabin. An exhaust gas recirculation flow control valve controls the flow of exhaust gas flowing through the exhaust gas recirculation line and through the line heat exchanger. The exhaust gas recirculation flow control valve is closed when the engine is not warm enough. A heater control valve controls the flow of coolant through the cabin heating circuit. Opening and closing of the heater control valve is made responsive to direct or indirect indication of engine temperature in order to maintain engine temperature by restricting flow to the cabin heating circuit.

Abstract: A method for an internal combustion engine includes the steps of collecting exhaust gas in a volume (502) and flowing exhaust gas out of the volume in a first and a second portions (504). The first portion forms a tailpipe gas stream (506), and the second portion forms an EGR gas stream (508). The tailpipe gas stream goes through a turbine (510), and is heated in a heat exchanger (512). The heat exchanger transfers thermal energy out of the EGR gas stream (516) to heat the tailpipe gas stream. The EGR gas stream is recirculated into an intake of the internal combustion engine (518).

Abstract: A method for an internal combustion engine includes the steps of collecting exhaust gas in a volume (902) and flowing exhaust gas out of the volume in a first and a second portions (904). The first portion forms a tailpipe gas stream (906), and the second portion forms an EGR gas stream (908). The tailpipe gas stream goes through a turbine (910). The EGR gas stream is catalyzed by an oxidizer coating in a heat exchanger, and thermal energy is transferred from the EGR gas stream to the tailpipe stream in the heat exchanger (916).

Abstract: A cylinder head (10) and a runnerless intake manifold (12) assembled together cooperatively define an air manifold (14) and a fuel manifold (16) for supplying air and fuel respectively to engine cylinders in an engine block to which cylinder head (10) is fastened.