Waste heat recovery system for recapturing energy after engine aftertreatment systems

摘要

The disclosure provides a waste heat recovery (WHR) system including a Rankine cycle (RC) subsystem for converting heat of exhaust gas from an internal combustion engine, and an internal combustion engine including the same. The WHR system includes an exhaust gas heat exchanger that is fluidly coupled downstream of an exhaust aftertreatment system and is adapted to transfer heat from the exhaust gas to a working fluid of the RC subsystem. An energy conversion device is fluidly coupled to the exhaust gas heat exchanger and is adapted to receive the vaporized working fluid and convert the energy of the transferred heat. The WHR system includes a control module adapted to control at least one parameter of the RC subsystem based on a detected aftertreatment event of a predetermined thermal management strategy of the aftertreatment system.

主权项

1. A waste heat recovery system including a Rankine cycle (RC) subsystem for converting heat energy of exhaust gas from an internal combustion engine, comprising:
an exhaust gas heat exchanger fluidly coupled downstream of an exhaust aftertreatment system including a particulate filter, said exhaust gas heat exchanger adapted to transfer heat from the exhaust gas to a working fluid of the RC subsystem; an energy conversion device fluidly coupled to the exhaust gas heat exchanger and adapted to receive the working fluid having the transferred heat and convert the energy of the transferred heat; a condenser fluidly coupled to the energy conversion device and adapted to receive the working fluid from which the energy was converted; a pump having an inlet downstream of, and fluidly coupled to an outlet of the condenser and an outlet upstream of, and fluidly coupled to an inlet of the heat exchanger, said pump adapted to move fluid from the condenser to the heat exchanger; and a control module adapted to control at least one parameter of the RC subsystem based on a detected aftertreatment regeneration event of a predetermined thermal management strategy of the aftertreatment system, the detected aftertreatment regeneration event including at least one of a time expiration of counter configured to correspond with a periodic regeneration of the particulate filter, a predetermined change in a pressure measurement across the particulate filter, and a notification to perform a regeneration based on a soot load calculation.