Exhaust system for internal combustion engine and condensate disposal strategy for same

An internal combustion engine system comprising:

• an exhaust gas recirculation (EGR) conduit;
• an outgoing exhaust conduit;
• a heat exchanger having a first heat exchange surface exposed to a flow of exhaust through the EGR conduit, and a second heat exchange surface in heat transference communication with the first heat exchange surface;
• a condensate collector coupled to the EGR conduit to collect condensate from the exhaust;
• a sprayer structured to spray condensate from the condensate collector onto the second heat exchange surface;
• and
• a vapor conduit extending between the heat exchanger and the outgoing exhaust conduit to convey condensate vaporized on the second heat exchange surface to the outgoing exhaust conduit for discharging;
• and
• the heat exchanger includes an EGR cooler, and further comprising a coolant heat exchanger, a coolant pump, and a condensate pump structured to pump condensate from the condensate collector through the coolant heat exchanger to exchange heat with coolant pumped through the coolant heat exchanger.

An internal combustion engine system comprising:

• an exhaust gas recirculation (EGR) conduit;
• an outgoing exhaust conduit;
• a heat exchanger having a first heat exchange surface exposed to a flow of exhaust through the EGR conduit, and a second heat exchange surface in heat transference communication with the first heat exchange surface;
• a condensate collector coupled to the EGR conduit to collect condensate from the exhaust;
• a sprayer structured to spray condensate from the condensate collector onto the second heat exchange surface;
• a vapor conduit extending between the heat exchanger and the outgoing exhaust conduit to convey condensate vaporized on the second heat exchange surface to the outgoing exhaust conduit for discharging;
• and
• further comprising an EGR condenser, a first coolant loop through the heat exchanger, a second coolant loop through the EGR condenser that is fluidly in parallel with the first coolant loop, and a second coolant pump structured to pump coolant through the second coolant loop.

An exhaust system for an internal combustion engine comprising:

• an exhaust gas recirculation (EGR) conduit;
• an EGR cooler including an exhaust heat exchange surface exposed to a flow of exhaust through the EGR conduit, and a second heat exchange surface, a coolant inlet, and a coolant outlet;
• a coolant heat exchanger fluidly connected to the coolant outlet;
• a coolant pump fluidly connected to the coolant inlet;
• a condensate collector coupled to the EGR conduit to collect condensate from the exhaust;
• a sprayer structured to spray condensate from the condensate collector onto the second heat exchange surface to vaporize the condensate for discharging;
• and
• a condensate pump structured to pump condensate from the condensate collector to the sprayer;
• and
• further comprising an EGR condenser, and an exhaust temperature sensor structured to produce an exhaust temperature signal indicative of a temperature of recirculated exhaust cooled in the EGR cooler and the EGR condenser.