Isuzu Motors Limited

Isuzo Motors Limited

Akihiro Sawada

Masanobu Minezawa

Tomoyuki Kamijyou

Provided is an exhaust gas purification apparatus having a control device that monitors the transition of a detection value of each of an upstream NOx sensor and a downstream NOx sensor, and when the NOx purification rate of the SCR catalyst falls to a value of a first threshold or lower, generates an abnormality detection signal indicating that an over storage state has occurred in an SCR catalyst if the amount of change in the detection value of the upstream NOx sensor per unit time is at least a second threshold and the amount of change in the detection value of the downstream NOx sensor per unit time is at most a third threshold.

Exhaust gas purification device for internal combustion engine, and vehicle

An exhaust purification system can prevent a NHslip caused by an excessive injection of urea water, and includes: an SCR that purifies NOx contained in an exhaust gas using ammonia, as a reducing agent, produced from urea water; a urea water injection device that injects the urea water into an exhaust passage upstream from the SCR; an estimated-adsorption-amount calculation unit that calculates an estimated adsorption amount of the ammonia adsorbed in the SCR; an injection control unit that executes an injection control of the urea water injection device based on the estimated adsorption amount; and an estimated-adsorption-amount change unit that changes the estimated adsorption amount used for the injection control into a value increased or decreased by a predetermined amount when a predetermined condition is established that can cause a difference between an actual adsorption amount of the ammonia adsorbed in the SCR and the estimated adsorption amount.

Growing community of inventors

Fujisawa, Japan

Akihiro Sawada