Internal-combustion-engine warm-up apparatus

An internal-combustion-engine warm-up apparatus comprising:

• a post-processing apparatus that has a catalyst, and removes nitrogen oxides in exhaust gas discharged from an engine in an exhaust path where the exhaust gas passes;
• a heater arranged upstream of the post-processing apparatus on the exhaust path;
• a circulation path where air having passed through the post-processing apparatus is fed back to an upstream side of the heater;
• a blower that feeds air heated by the heater to the post-processing apparatus;
• a coolant flow path where a coolant of the engine flows;
• a heat exchanger that warms the coolant in the coolant flow path by causing heat exchange between the heated air having passed through the post-processing apparatus and the coolant;
• and
• a control apparatus that controls operation of the heater and the blower, wherein
• in a state where the engine is stopped, the control apparatus causes the heater and the blower to operate, and causes the air heated by the heater to be supplied to the post-processing apparatus and the heat exchanger.