System for controlling an air handling system including an electric pump-assisted exhaust gas recirculation

摘要

A system controlling an air handling system for an internal combustion engine. An EGR valve in-line with an EGR passageway fluidly coupled between exhaust and intake manifolds of the engine is controllable between fully closed open positions to control a flow rate of exhaust gas through the EGR passageway. A control circuit determines a pump enable value as a function of at least one of a target engine speed and a total fueling target, determines a maximum achievable flow rate of recirculated exhaust gas through the EGR passageway with the EGR valve in the fully open position, and activates an electric gas pump to increase the flow rate of exhaust gas through the EGR passageway if the pump enable value exceeds a threshold pump enable value and a target flow rate of recirculated exhaust gas through the EGR passageway is less than the maximum achievable flow rate.

主权项

1. An air handling system for an internal combustion engine, comprising:
an exhaust gas recirculation (EGR) passageway fluidly coupled between an exhaust manifold of the engine via an exhaust gas passageway and an intake manifold of the engine via an intake air passageway, an EGR valve disposed in-line with the EGR passageway, the EGR valve controllable between fully closed and fully open positions to control a flow rate of exhaust gas through the EGR passageway from the exhaust manifold to the intake manifold, a dedicated electric gas pump for the exhaust gas, that increases, when activated, the flow rate of exhaust gas through the EGR passageway supplied to the intake air passageway, and a control circuit including a memory having instructions stored therein that are executable by the control circuit to:
determine a pump enable value in response to at least one of a target engine speed and a total fueling target and to determine a maximum achievable flow rate of recirculated exhaust gas through the EGR passageway with the EGR valve in the fully open position and with the electric gas pump present and deactivated,activate the electric gas pump to increase the flow rate of exhaust gas through the EGR passageway in response to the pump enable value exceeding a threshold pump enable value and a target flow rate of recirculated exhaust gas through the EGR passageway being less than the maximum achievable flow rate; anddeactivate the electric gas pump in response to the pump enable value being less than the threshold pump enable value.