Methods and systems are provided for exhaust gas heat recovery at an exhaust gas heat exchanger. Exhaust gas may flow in both directions through an exhaust bypass passage and the heat exchanger coupled to the bypass passage. Hot or cold EGR may be delivered from the exhaust passage to the engine intake manifold and heat from the exhaust gas may be recovered at the heat exchanger.

A coolant control valve that selectively supplies an EGR cooler with coolant may include a cylinder head having a first water jacket and a second water jacket, an EGR cooler that is disposed at one side of the cylinder head and is disposed on an EGR line that recirculates exhaust gas from an exhaust side to an intake side, a heater that is disposed at another side of the cylinder head and heats air through coolant that is supplied to the heater, and a coolant control valve that respectively controls coolant that is supplied from the first water jacket and the second water jacket, supplies the heater with the coolant, and selectively supplies the EGR cooler with the coolant depending on a temperature of the coolant.

A coolant control valve that selectively supplies an EGR cooler with coolant may include a cylinder head having a first water jacket and a second water jacket, an EGR cooler that is disposed at one side of the cylinder head and is disposed on an EGR line that recirculates exhaust gas from an exhaust side to an intake side, a heater that is disposed at another side of the cylinder head and heats air through coolant that is supplied to the heater, and a coolant control valve that respectively controls coolant that is supplied from the first water jacket and the second water jacket, supplies the heater with the coolant, and selectively supplies the EGR cooler with the coolant depending on a temperature of the coolant.

An improved apparatus for reducing friction in an EGR driver may include a space member mounted on a stem and having a side provided with a plurality of depressed portions to reduce a contact area with an inner side of a valve, such that the friction generated by a contact of the stem with a stem guide when the stem provided inside the valve vertically moves is reduced.

An arrangement for attaching a control valve to a flow channel housing of an internal combustion engine which includes an insertion housing part which projects into the flow channel housing. The arrangement includes an actuator housing, an actuator arranged in the actuator housing, a housing plate which rests on the flow channel housing, screws, and a collar flange which radially surrounds the housing plate. The insertion housing part extends on a first side of the housing plate and the actuator housing extends on a second opposite side of the housing plate. The collar flange comprises a screw hole pattern arranged thereon and through-holes arranged therein. The screw hole pattern corresponds to a connecting bore pattern of the flow channel housing. The control valve is attached to the flow channel housing via the screws being inserted through the through-holes of the collar flange.

An arrangement for attaching a control valve to a flow channel housing of an internal combustion engine which includes an insertion housing part which projects into the flow channel housing. The arrangement includes an actuator housing, an actuator arranged in the actuator housing, a housing plate which rests on the flow channel housing, screws, and a collar flange which radially surrounds the housing plate. The insertion housing part extends on a first side of the housing plate and the actuator housing extends on a second opposite side of the housing plate. The collar flange comprises a screw hole pattern arranged thereon and through-holes arranged therein. The screw hole pattern corresponds to a connecting bore pattern of the flow channel housing. The control valve is attached to the flow channel housing via the screws being inserted through the through-holes of the collar flange.