Enhanced long route EGR cooler arrangement with bypass

An internal combustion engine, comprising:

• an engine structure including a plurality of cylinders;
• an air intake system in communication with the plurality of cylinders;
• an exhaust system in communication with the plurality of cylinders;
• an EGR passage in communication with the exhaust system and the air intake system, said EGR passage including an EGR cooler with an EGR inlet end with a passage having a vertically descending portion extending downward in an assembled condition in an exhaust system to an intermediate section downstream from the vertically descending portion;
• the passage including a vertically ascending portion downstream from the intermediate section and extending upward from the intermediate section toward an EGR outlet end;
• and
• a first cooler matrix disposed in the vertically descending or vertically ascending portions,
• wherein the intermediate section is in direct contact with an aftertreatment system of the exhaust system.

An internal combustion engine, comprising:

• an engine structure including a plurality of cylinders;
• an air intake system in communication with the plurality of cylinders;
• an exhaust system in communication with the plurality of cylinders;
• an EGR passage in communication with the exhaust system and the air intake system, said EGR passage including an EGR cooler with an EGR inlet end with a passage having a vertically descending portion extending downward in an assembled condition in an exhaust system to an intermediate section downstream from the vertically descending portion;
• the passage including a vertically ascending portion downstream from the intermediate section and extending upward from the intermediate section toward an EGR outlet end;
• and
• a first cooler matrix disposed in the vertically descending or vertically ascending portions,
• further comprising a bypass pipe connected to the EGR passage to bypass the EGR cooler.