| 主权项 |
1. An exhaust system for a turbocharged internal combustion engine comprising:
a first exhaust conduit extending between, and in fluid communication with, a first engine cylinder and a turbocharger inlet and configured to conduct exhaust gas from the first engine cylinder to the turbocharger inlet; a second exhaust conduit extending between, and in fluid communication with, a second engine cylinder and an inlet for an exhaust gas recirculation system and configured to conduct exhaust gas from the second engine cylinder to the exhaust gas recirculation system; an exhaust gas bypass extending between, and in fluid communication with, the first and second exhaust conduits and configured to divert exhaust gas flowing through the second exhaust conduit to the first exhaust conduit and the turbocharger inlet under conditions of varying exhaust gas recirculation demand of the internal combustion engine; a flow divider extending within the second exhaust conduit to define a first flow passage and a second flow passage, the first flow passage being in fluid communication with the inlet of the exhaust gas recirculation system and in fluid communication with the first exhaust conduit, and the second flow passage being in fluid communication with the first exhaust conduit; an exhaust gas particulate filter disposed for receiving exhaust gas flowing from the first engine cylinder; one or more sensors disposed and configured for indicating whether a backpressure in the exhaust system has exceeded a predetermined level; and an engine controller operatively connected to the one or more sensors and to a fuel delivery system for delivering fuel to the first engine cylinder and the second engine cylinder; wherein the engine controller is configured to determine, based at least in part on the backpressure in the exhaust system, whether regeneration of the exhaust gas particulate filter is required; wherein the engine controller is further configured to deliver fuel to the second engine cylinder at a rate and quantity associated with normal operation of the second engine cylinder without regard for whether regeneration of the exhaust gas particulate filter is required; and wherein the engine controller is further configured to deliver fuel to the first engine cylinder at a rate and quantity associated with not only operation of the second engine cylinder, but also regeneration of the exhaust gas particulate filter, whenever regeneration of the exhaust gas particulate filter is required. |
