Exhaust Management Strategies For Opposed-Piston, Two-Stroke Engines

摘要

Exhaust temperature management strategies for an opposed-piston, two-stroke engine with EGR are based on control of a ratio of the mass of fresh air and external EGR delivered to a cylinder to the mass of the trapped charge (density of the delivered charge multiplied by the trapped volume at port closing).

主权项

1. A two-cycle internal combustion engine including at least one cylinder with exhaust and intake ports, a charge air channel to provide charge air to at least one intake port of the engine, and an exhaust channel to receive exhaust from at least one exhaust port of the engine, in which an exhaust gas recirculation (EGR) loop has a loop input coupled to the exhaust channel and a loop output coupled to the charge air channel, a supercharger is operable to pump charge air in the charge air channel, a backpressure device is operable to control backpressure in the exhaust channel, and a control mechanization is operable to control the supercharger, the EGR loop, and the backpressure device during cold start of the engine.