EXHAUST GAS RECIRCULATION WITH CONDENSATION CONTROL

摘要

An EGR system (126) includes an engine (120), an EGR valve (134); a two-pass full flow EGR cooler (142) having a cross-sectional area to increase flow rates and reduce fouling; and a bypass valve (151) positioned downstream of the EGR valve (134) and upstream of the EGR cooler (142) to reduce/eliminate the EGR condensation. A trap (152) is positioned downstream of the EGR cooler (142) t o collect any condensate; an associated electric heater (158) having appropriate piping to bypass the turbocharger and deliver the mixture to the tailpipe. A charge-air-cooler bypass valve is provided alone or with the EGR cooler bypass and/or trap(s).