Ammonia generation apparatus and ammonia generation control apparatus

An ammonia generation control apparatus comprising:

• a main body which is disposed in an exhaust passage of an internal combustion engine and has first and second flow passages that are separated from each other;
• a urea water supply section which is disposed on an exhaust gas introduction side of the main body and supplies urea water to the first and second flow passages;
• a heating unit disposed in the first flow passage;
• a changeover section which is disposed before the flow passages in a flow direction of the exhaust gas and can selectively switch the flow direction of the exhaust gas between the first flow passage and the second flow passage;
• and
• a control section which controls the changeover section so as to switch the flow direction of the exhaust gas to the second flow passage when the internal combustion engine is in a first operation state,
• wherein a heat insulating material is charged in a space inside the main body and between the first flow passage and the second flow passage,
• wherein the first operation state is an operation state in which the heating unit is operated, wherein
• the control section further controls the supply of urea water by the urea water supply section and the operation of the heating unit;
• and
• in the first operation state, after switching the flow direction of the exhaust gas to the second flow passage and operating the heating unit, the control section switches the flow direction of the exhaust gas to the first flow passage and causes the urea water supply section to supply urea water to the first flow passage.