To provide an oil deterioration determination device for an internal combustion engine having a blowby gas reduction device, for determining a deterioration state of engine oil based on generation of gas in a crankcase.
In oil deterioration determination device, an ECU executes a program including: a step S100 detecting throttle opening; a step S110 detecting an engine speed; a step S130 selecting a map 2 if an oil deterioration suppression control is under execution (YES in step S120); a step S140 selecting a map 1 if the oil deterioration suppression control is not under execution (NO in step S120); a step S150 calculating nitrogen oxide concentration; a step S160 calculating carbon dioxide concentration; and a step S190 executing an oil deterioration alarm processing if a state where the nitrogen oxide concentration or carbon dioxide concentration is higher than an alarm threshold value has been continued for a predetermined time (YES in a step S170 and YES in a step S180).
Toshio Morita
Tadashi Muto
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