EGR Control Device For Internal Combustion Engine
AssigneeMitsubishi Fuso Truck and Bus Corporation
InventorsSeijiro Kotooka, Susumu Kohketsu, Hitoshi Yokomura
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Abstract
An EGR control device includes an EGR control means (44) which, when a large-amount EGR is requested, continuously controls an EGR valve (26) toward a fully open condition, and then continuously controls an intake throttle valve (12) toward a fully closed condition, and in a dead region where a change in the opening of the intake throttle valve only causes a small change in EGR quantity, the control means restricts a feedback control of the EGR quantity using the intake throttle valve and performs a feedback control of the EGR quantity using the EGR valve to compensate for the restriction of the feedback control using the intake throttle valve.
Claims6
An EGR control device for an internal combustion engine, comprising
- an intake throttle valve provided in an intake passage of the internal combustion engine and an EGR valve provided in an EGR passage connecting the intake passage and an exhaust passage, and designed to feedback-control EGR quantity by continuously controlling the opening of the EGR valve and the opening of the intake throttle valve, wherein
- the EGR control device includes an EGR control means which, when a large-amount EGR is requested, continuously controls the EGR valve toward a fully open condition, and then continuously controls the intake throttle valve toward a fully closed condition, and
- in a dead region where a change in the opening of the intake throttle valve only causes a small change in EGR quantity, said control means restricts a feedback control of the EGR quantity using the intake throttle valve and performs a feedback control of the EGR quantity using the EGR valve to compensate for the restriction of the feedback control using the intake throttle valve.
Dependencies are inferred from the claim text.