Apparatus for retrieving exhaust heat of engine and method for controlling engine using the same

An apparatus for retrieving exhaust heat of an engine, comprising:

• the engine including a plurality of combustion chambers generating driving force by combustion of fuel;
• an intake line into which intake gas supplied to the plurality of combustion chambers is introduced;
• an exhaust line through which exhaust gas exhausted from the plurality of combustion chambers flows;
• a turbocharger including:
• a turbine provided on the exhaust line and rotated by the exhaust gas exhausted from the plurality of combustion chambers;
• and
• a compressor provided on the intake line, rotated together with the turbine, and compressing external air;
• an exhaust gas recirculation (EGR) apparatus including:
• an EGR line branched from the exhaust line downstream of the turbine and merged with the intake line;
• an EGR cooler disposed on the EGR line to cool the exhaust gas flowing through the EGR line;
• and
• an EGR valve to adjust an amount of re-circulated exhaust gas;
• an intercooler to cool the intake gas introduced through the intake line;
• a coolant circuit circulating a coolant through the engine, an intercooler, a radiator, and the EGR cooler;
• a sensor detecting a coolant temperature of the coolant circuit;
• an exhaust heating line branched from the exhaust line which passes through the EGR cooler and rejoins with the exhaust line;
• and
• an exhaust adjusting valve disposed on the exhaust heating line which adjusts an amount of exhaust gas in the exhaust heating line passing through the EGR cooler.