Reduced emissions internal combustion engine systems

Abstract

Internal combustion diesel engine systems and methods of operation are disclosed that include a diesel engine, an exhaust gas recirculation system, a wastegated turbocharger, an exhaust throttle, and a vanadia selective catalytic reduction catalyst downstream of the exhaust throttle.

Description

Background technique [0001] Internal combustion engines, such as diesel engines, are connected to an exhaust system that typically includes an aftertreatment system to reduce the emission of pollutants, such as NOx, from the exhaust pipe. Such aftertreatment systems may use oxidation catalysts, particulate filters, and selective catalytic reduction (SCR) catalysts. Since SCR catalysts typically operate more efficiently at higher exhaust temperatures, certain exhaust heating strategies such as hydrocarbon injection, oxidation catalysts, and / or variable geometry turbine (VGT) inlet control are used to increase or maintain SCR catalyst temperature within its valid temperature range. However, these exhaust heating strategies and NOx emission control using such systems are achieved at high initial system costs, fuel losses, and / or high operating costs over the life of the system. [0002] SCR catalysts suffer from poor performance due to the accumulation of various contaminants s...

AI Technical Summary

Problems solved by technology

However, VGTs are expensive and control of opening can be complex depending on the engine operating conditions used to achieve the desired result

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