Patent ID: 7895831

Claim:
An exhaust emission control system for an internal combustion engine, for reducing exhaust emissions by collecting particulates from exhaust gases discharged from the engine, which is installed on a means of transportation as a drive source, into an exhaust system, comprising: a filter provided in the exhaust system, for collecting the particulates from the exhaust gases; regeneration operation-executing means for carrying out post injection for additionally injecting fuel into a combustion chamber of the engine after a combustion stroke of the engine to thereby perform a regeneration operation for regenerating said filter; travel distance-detecting means for detecting a travel distance of the means of transportation; post injection allowable amount-calculating means for calculating a post injection allowable amount indicative of an allowable amount of fuel to be injected by the post injection such that the post injection allowable amount increases in accordance with an increase in the detected travel distance; post injection allowable amount-reducing means for subtracting an amount of fuel injected by the post injection from the post injection allowable amount during execution of the post injection; and post injection-inhibiting means for inhibiting the post injection when the post injection allowable amount is not larger than a predetermined first threshold value.