| 摘要 |
When it is estimated that an amount of oxygen stored in the catalyst is a maximum amount, an electronic control unit executes forced rich control and estimates a maximum oxygen release amount during a period between the start of this control and a rich reversal of an output of the oxygen sensor, based on this period of time. When it is estimated that the amount of oxygen stored in the catalyst is a minimum amount, the electronic control unit executes forced lean control and estimates a maximum oxygen storage amount during a period between the start of this control and a lean reversal of the output of the oxygen sensor, based on this period of time. If the absolute value of a difference between the maximum oxygen release amount and the maximum oxygen storage amount is equal to or greater than a predetermined value, an exhaust gas control apparatus and a method for determining an abnormality thereof determine that there is a response delay.
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