To restrain deterioration of emission in a configuration having a cooling means capable of condensing the water-soluble HC in the exhaust gas.
An abnormality sensing process is executed in an engine system 10 having a first cooling device 500 and a second cooling device 600 downstream of a U/F catalyst 400. In this case, if detection conditions of the catalyst temperature Tctl not yet reaching the catalyst activating temperature Tctlth are satisfied while the intake-air volume amount integration value Gat reaching a predetermined value after start of the engine, whether or not the cooling device temperature Tclr as the temperature of a tank 510 of the first cooling device 500 is in a predetermined normal range. In the case the cooling device temperature Tclr is outside the normal range, that is, it is lower than the lower limit value Tclrl or higher than the upper limit value Tclrh, and the like, it is determined that the first cooling device 500 is in an abnormal state of not having a presumed cooling ability or not capable of performing the same so as to carry out lighting control of an indicator 800.
NAKAYAMA YUSUKE
ITO TAKESHI
Koji Yamamoto
Satoshi Nakamura
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