Patent ID: 11891934
Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
Field: Environmental technology (Chemistry)
Classification: CPC F  Y | IPC F

Claim 2:
3. A control method for an internal combustion engine, wherein
an exhaust purification device is disposed in an exhaust passage of the internal combustion engine, and
the control method comprises:
executing a regeneration process of burning and removing particulate matter accumulated in the exhaust purification device;
calculating a first change amount that is a change amount per unit time of an upstream-side temperature, the upstream-side temperature being a temperature of exhaust gas on an upstream side of the exhaust purification device;
calculating a second change amount that is a change amount per unit time of a downstream-side temperature, the downstream-side temperature being a temperature of exhaust gas on a downstream side of the exhaust purification device;
executing a determination process of determining that a deviation between the first change amount and the second change amount is less than or equal to a threshold;
determining that the exhaust purification device is in a detached state when it is determined that the deviation is less than or equal to the threshold; and
after executing the regeneration process, not executing the determination process during a period from the end of the regeneration process to when a post-regeneration execution condition is met.