Methods and systems are provided for exhaust gas heat recovery and exhaust gas recirculation (EGR) cooling using a single split heat exchanger. Exhaust heat from each of a first portion of exhaust routed to the intake manifold as EGR and a second portion of exhaust diverted via a bypass passage for exhaust heat recovery may be transferred to a coolant flowing through the heat exchanger. The direction of coolant flow via the heat exchanger may be adjusted based on the coolant temperature.

Methods and systems are provided for exhaust gas heat recovery and exhaust gas recirculation (EGR) cooling using a single split heat exchanger. Exhaust heat from each of a first portion of exhaust routed to the intake manifold as EGR and a second portion of exhaust diverted via a bypass passage for exhaust heat recovery may be transferred to a coolant flowing through the heat exchanger. The direction of coolant flow via the heat exchanger may be adjusted based on the coolant temperature.

The device includes an upstream pipe, extending along a first direction, and in which at least one purification member is housed, a first downstream pipe, extending along a second direction, and in which at least one heat exchanger is housed, and a second downstream pipe configured to be connected to an exhaust gas outlet tube. The device also includes an intermediate chamber comprising an exhaust gas inlet communicating with the upstream pipe, downstream from the at least one purification member, a first exhaust gas outlet communicating with the first downstream pipe, and a second exhaust gas outlet communicating with the second downstream pipe. The first direction and the second direction form an angle between them comprised between 0 and 90.

An engine includes an exhaust manifold, an intake manifold, and an EGR device configured to supply EGR gas from the exhaust manifold to the intake manifold. A longitudinal direction of the EGR cooler is in an up-down direction of the engine in a used state. The exhaust manifold has an EGR pipe that is connected to an EGR cooler, and a part of the EGR pipe extends in left-and-right directions. The part of the EGR pipe is provided at a side where a flywheel housing is provided. An upper end of the EGR cooler has a supply port into which the EGR gas is supplied from the exhaust manifold. The part of the EGR pipe and the flywheel housing are located in an up-down directions.

A method for operating an internal combustion engine is provided. The method includes closing an EGR valve positioned in an exhaust gas recirculation (EGR) conduit downstream of an EGR cooler, the EGR conduit coupled to an intake system and an exhaust system and determining a profile of exhaust pressure waves in the exhaust system. The method also includes adjusting a volume of variable volume vessel based on the profile of the exhaust pressure waves, the variable volume vessel positioned downstream of the EGR cooler and upstream of the EGR valve.

A method for operating an internal combustion engine is provided. The method includes closing an EGR valve positioned in an exhaust gas recirculation (EGR) conduit downstream of an EGR cooler, the EGR conduit coupled to an intake system and an exhaust system and determining a profile of exhaust pressure waves in the exhaust system. The method also includes adjusting a volume of variable volume vessel based on the profile of the exhaust pressure waves, the variable volume vessel positioned downstream of the EGR cooler and upstream of the EGR valve.

A method of controlling a turbine of an exhaust heat recovery system in which heat of exhaust gas evaporates a working fluid through a heat exchanger provided in an exhaust pipe and the working fluid is supplied to the turbine may include measuring an internal temperature of the heat exchanger, and rotating the turbine in a reverse direction when the measured internal temperature is a predetermined temperature or less.

A method of controlling a turbine of an exhaust heat recovery system in which heat of exhaust gas evaporates a working fluid through a heat exchanger provided in an exhaust pipe and the working fluid is supplied to the turbine may include measuring an internal temperature of the heat exchanger, and rotating the turbine in a reverse direction when the measured internal temperature is a predetermined temperature or less.

A system and method to perform bypass actuation detection includes alternating control of a bypass valve within an exhaust gas recirculation (EGR) system of a vehicle to direct flow of gas through a cooler module or a bypass module within the EGR system. The method also includes determining a position of an EGR valve that directs the gas into the EGR system, and verifying operation of the bypass valve based on the position of the EGR valve.

A system and method to perform bypass actuation detection includes alternating control of a bypass valve within an exhaust gas recirculation (EGR) system of a vehicle to direct flow of gas through a cooler module or a bypass module within the EGR system. The method also includes determining a position of an EGR valve that directs the gas into the EGR system, and verifying operation of the bypass valve based on the position of the EGR valve.