An Exhaust Gas Recirculation (EGR) cooler assembly and an EGR cooler conduit assembly are provided. Heat exchange tubes in EGR cooler assemblies may vibrate and contact the EGR cooler shell, thereby leading to the tube fretting and potentially failing. The current disclosure is directed to the use of damping rods to absorb vibratory impacts and reduce or eliminate tube fretting.

A combination structure of an Exhaust Gas Recirculation (EGR) cooler may include a housing open at both sides thereof, a plurality of headers inserted in both of the sides of the housing and having a circumference forming a layer with the housing, and a plurality of diffusers each including a coupling portion, which is inserted in the headers to form a layer with the housing and the headers, at a first side and having a hole for receiving and discharging exhaust gas at a second side, in which sides of the housing and the headers may be welded, and the housing, the circumference of the headers, and coupling portions of the diffusers may be welded.

The subject matter of this specification can be embodied in, among other things, a heat exchanger apparatus that includes a first fluid conduit defining a first fluid flow path for a first fluid and comprising a fluid diode that is at least partly fluidically diodic and formed of a thermally conductive material, the fluid diode having a first fluid inlet, a first fluid outlet, a first sub-conduit extending from the fluid inlet to the fluid outlet, and a second sub-conduit extending from the first sub-conduit proximal the fluid inlet to the first sub-conduit proximal the fluid outlet as a partial loop defining a cavity extending through the partial loop, and a second fluid conduit in thermal communication with the first fluid conduit and defining a second fluid flow path through the partial loop, fluidically isolated from the first fluid flow path, for a second fluid.

The subject matter of this specification can be embodied in, among other things, a heat exchanger apparatus that includes a first fluid conduit defining a first fluid flow path for a first fluid and comprising a fluid diode that is at least partly fluidically diodic and formed of a thermally conductive material, the fluid diode having a first fluid inlet, a first fluid outlet, a first sub-conduit extending from the fluid inlet to the fluid outlet, and a second sub-conduit extending from the first sub-conduit proximal the fluid inlet to the first sub-conduit proximal the fluid outlet as a partial loop defining a cavity extending through the partial loop, and a second fluid conduit in thermal communication with the first fluid conduit and defining a second fluid flow path through the partial loop, fluidically isolated from the first fluid flow path, for a second fluid.

An integrated exhaust gas recirculation (EGR) cooler may include a cooling core having exhaust gas flowing therein, and an integrated housing accommodating the cooling core therein and having a coolant flowing therein, in which the integrated housing includes a coolant introduction port having the coolant introduced from an engine thereinto, a first exhaust port exhausting the coolant to a radiator, and a control valve controlling a flow of the coolant through the first exhaust port, and the cooling core includes U-shaped tubes including a bend so that a surface area is increased.

An integrated exhaust gas recirculation (EGR) cooler may include a cooling core having exhaust gas flowing therein, and an integrated housing accommodating the cooling core therein and having a coolant flowing therein, in which the integrated housing includes a coolant introduction port having the coolant introduced from an engine thereinto, a first exhaust port exhausting the coolant to a radiator, and a control valve controlling a flow of the coolant through the first exhaust port, and the cooling core includes U-shaped tubes including a bend so that a surface area is increased.

An integrated cooling system includes a temperature adjustment chamber including an intercooler configured to exchange heat between a coolant and compressed air supplied to an engine, an exhaust gas recirculation (EGR) cooler configured to exchange heat between the coolant and an exhaust gas recirculating to the engine, and an oil cooler configured to exchange heat between the coolant and an engine oil. A coolant line is configured to supply coolant to the temperature adjustment chamber and transmit the coolant discharged from the temperature adjustment chamber to the engine.

An integrated cooling system includes a temperature adjustment chamber including an intercooler configured to exchange heat between a coolant and compressed air supplied to an engine, an exhaust gas recirculation (EGR) cooler configured to exchange heat between the coolant and an exhaust gas recirculating to the engine, and an oil cooler configured to exchange heat between the coolant and an engine oil. A coolant line is configured to supply coolant to the temperature adjustment chamber and transmit the coolant discharged from the temperature adjustment chamber to the engine.

A heat exchange device suitable for cooling recirculated exhaust gases in an EGR (Exhaust Gas Recirculation) system includes a configuration which allows integrating the heat exchanger in a cavity of the engine block of an internal combustion engine with the cavity being in fluid communication with the liquid coolant of the engine.

Methods and systems are provided for condensate management in an EGR cooler of an engine system. In one example, an exhaust gas recirculation (EGR) system with an EGR cooler is coupled to an exhaust system and to an intake system of an engine. The EGR cooler includes an inlet coupled to the exhaust system, a first outlet coupled to the exhaust system, and a second outlet coupled to the intake system, the second outlet positioned vertically higher than the first outlet.