A diesel engine is provided with an EGR line G3 configured to recirculate a portion of exhaust gas, discharged from an engine body 11, to the engine body 11 as combustion gas, an EGR cooler 16 provided in the EGR line G3 and configured to cool exhaust gas by coolant, a coolant supply device configured to supply coolant to the EGR cooler 16, and a control device 30 configured to activate the coolant supply device when the engine body 11 is in operation and a temperature of the engine body 11 is lower or equal to a preset prescribed temperature.

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. An EGR cooler is provided at a side of the exhaust manifold, and a longitudinal direction of the EGR cooler is in an up-down direction of the engine in a used state.

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. An EGR cooler is provided at a side of the exhaust manifold, and a longitudinal direction of the EGR cooler is in an up-down direction of the engine in a used state.

A control device of an engine is provided. The engine is operated at a high compression ratio, a geometric compression ratio of the engine being 14:1 or higher. The control device includes a fuel injection controller for controlling a fuel injector of the engine to start a fuel injection in a latter half of a compression stroke within an engine operating range where an engine speed is below a predetermined value and an engine load is above a predetermined value, and an ignition controller for controlling an ignition plug of the engine to retard an ignition timing when a timing for the fuel injection controller to start the fuel injection is on a retarding side of a predetermined timing, the ignition timing being retarded based on a retarding amount of the fuel injection start timing from the predetermined timing.

A control device of an engine is provided. The engine is operated at a high compression ratio, a geometric compression ratio of the engine being 14:1 or higher. The control device includes a fuel injection controller for controlling a fuel injector of the engine to start a fuel injection in a latter half of a compression stroke within an engine operating range where an engine speed is below a predetermined value and an engine load is above a predetermined value, and an ignition controller for controlling an ignition plug of the engine to retard an ignition timing when a timing for the fuel injection controller to start the fuel injection is on a retarding side of a predetermined timing, the ignition timing being retarded based on a retarding amount of the fuel injection start timing from the predetermined timing.

The present invention relates to a method for controlling an internal combustion engine arrangement (100) connected to an exhaust gas aftertreatment system (200), wherein the method is arranged to control a gas heating device ( 122), as well as a gas feeding arrangement to direct a flow of intake air through the exhaust gas recirculation conduit (112) from the intake system to the exhaust system, the flow of intake air being directed through the gas heating device before the intake air enters the exhaust gas aftertreatment system, in response to determining a requested start of the internal combustion engine to heat the aftertreatment system before starting the engine.

The present invention relates to a method for controlling an internal combustion engine arrangement (100) connected to an exhaust gas aftertreatment system (200), wherein the method is arranged to control a gas heating device ( 122), as well as a gas feeding arrangement to direct a flow of intake air through the exhaust gas recirculation conduit (112) from the intake system to the exhaust system, the flow of intake air being directed through the gas heating device before the intake air enters the exhaust gas aftertreatment system, in response to determining a requested start of the internal combustion engine to heat the aftertreatment system before starting the engine.

The exhaust gas recirculation system includes a plurality of coolers arranged in a predefined configuration that are configured to receive a flow of exhaust gas and a flow of coolant therethrough. The exhaust gas recirculation system further includes plurality of valves associated with each of the plurality of coolers. The plurality of valves is configured to regulate at least one of the flows of exhaust gas and the coolant through the corresponding cooler. The exhaust gas recirculation system also includes a control unit configured to selectively switch opening and closing of the plurality of valves such that at least one of the flow of exhaust gas and the flow of coolant through at least one cooler of the plurality of coolers is regulated during an operation of the exhaust gas recirculation system, to actively regenerate the at least one cooler.

The exhaust gas recirculation system includes a plurality of coolers arranged in a predefined configuration that are configured to receive a flow of exhaust gas and a flow of coolant therethrough. The exhaust gas recirculation system further includes plurality of valves associated with each of the plurality of coolers. The plurality of valves is configured to regulate at least one of the flows of exhaust gas and the coolant through the corresponding cooler. The exhaust gas recirculation system also includes a control unit configured to selectively switch opening and closing of the plurality of valves such that at least one of the flow of exhaust gas and the flow of coolant through at least one cooler of the plurality of coolers is regulated during an operation of the exhaust gas recirculation system, to actively regenerate the at least one cooler.

Methods and systems are provided for exhaust gas heat recovery at a split 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. Warm 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.