Patent ID: 9562461
Date: 2017-02-07
CPC Classifications: F01N,Y02T

Claim:
1. An exhaust gas control system of an internal combustion engine, comprising: a urea water tank to store urea water; a heater to heat frozen urea water within the urea water tank; a purifying device configured to purify exhaust gas by addition of the urea water pumped from the urea water tank to the exhaust gas of the internal combustion engine; a notification device; and a controller configured to (i) determine whether frozen urea water is left within the urea water tank or not; (ii) determine, whether or not, liquid urea water capable of being pumped out is not left within the urea water tank; (iii) estimate an amount of urea water that can be supplied into the urea water tank in response to a state where the frozen urea water is left within the urea water tank; and (iv) control the notification device so as to give a notification for prompting a supply of the amount of urea water that can be supplied into the urea water tank in response to a state where liquid urea water capable of being pumped out is not left within the urea water tank.