Toyota Jidosha Kabushiki Kaisha

Ryohei Ohno

Toru Kidokoro

Makoto Ogiso

Kenji Furui

Takeru Shirasawa

Yuriko Hagimoto

Embodiments of the present disclosure may estimate the amount of ammonia adsorbed in an SCR catalyst as accurately as possible. The ammonia adsorption amount is calculated by integrating the quantity of ammonia supplied to the SCR filter, the quantity of ammonia consumed in reduction of NOx in the SCR catalyst, and the quantity of ammonia desorbed from the SCR catalyst. In the calculation, a differential pressure change rate defined as the increase in a converted differential pressure value per unit increase in the filter PM deposition amount is referred to. The ammonia desorption quantity is calculated in such a way that the calculated value of the ammonia desorption quantity is made smaller when the differential pressure change rate is smaller than a predetermined threshold than when the differential pressure change rate is equal to or higher than the predetermined threshold.

Ammonia adsorption amount estimation apparatus, ammonia adsorption amount estimation method, and exhaust gas purification system for internal combustion engine

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Susono, Japan

Ryohei Ohno