Engine system

An engine system comprising:

• an engine including a combustion chamber generating a driving torque by combustion of a fuel;
• a plurality of intake lines through which outside air flows to the combustion chamber;
• an exhaust manifold connected to the combustion chamber at an exhaust side;
• an exhaust line which is connected to the exhaust manifold and through which exhaust gas flows;
• an exhaust gas purification device disposed on the exhaust line;
• a plurality of electric superchargers disposed on the plurality of intake lines, respectively;
• and
• an EGR device including:
• a recirculation line branched from the exhaust line at a lower stream of the exhaust gas purification device and joined to one of the plurality of intake lines;
• and
• a recirculation valve disposed on the recirculation line,
• wherein the plurality of intake lines include:
• a first intake valve disposed on a first intake line through which outside air is supplied to the combustion chamber;
• a second intake valve disposed on a second intake line through which outside air is supplied to the combustion chamber;
• and
• a bypass valve disposed on a bypass line connecting the first intake line and the second intake line,
• wherein the plurality of electric superchargers include a first electric supercharger and a second electric supercharger,
• wherein the first intake valve is disposed on a lower stream of the first electric supercharger,
• wherein the second intake valve is disposed on an upper stream of the second electric supercharger, and
• wherein the recirculation line is branched from the exhaust manifold and joined to the second intake line between the second intake valve and the second electric supercharger.