Apparatus and method for controlling low-pressure EGR system
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorBon-Chang Koo
Life of this patent
Estimating the term…
Abstract
An apparatus for controlling a low-pressure EGR system may include a driving information detector configured to detect a vehicle driving state, an EGR amount detector configured to detect an amount of external EGR controlled by a low-pressure EGR valve, and a controller configured to control the low-pressure EGR valve and intake and exhaust valves of an engine, based on the result detected by the driving information detector and the EGR amount detector, wherein the controller controls timings of the intake and exhaust valves to decrease an amount of internal EGR introduced into a cylinder through an exhaust port for a predetermined time when the amount of external EGR is decreased.
Claims10
An apparatus for controlling a low-pressure exhaust gas recirculation (EGR) system, comprising:
- a driving information detector configured to detect a vehicle driving state;
- an EGR amount detector configured to detect an amount of external EGR, which is recirculated from a rear end of a catalytic converter for purifying an exhaust gas into an engine through an external circulation path and controlled by a low-pressure EGR valve;
- and
- a controller configured to control the low-pressure EGR valve and intake and exhaust valves of the engine, based on a result detected by the driving information detector and the EGR amount detector,
- wherein the controller controls timings of the intake and exhaust valves such that a valve overlap is reduced in order to decrease an amount of internal EGR introduced into a cylinder through the exhaust valve from an exhaust port by the valve overlap for a predetermined time when the amount of external EGR is decreased,
- the predetermined time is varied according to an engine speed detected by the driving information detector, and
- the predetermined time is a time required for the amount of external EGR introduced into the cylinder through the external circulation path to be reduced to a predetermined value.
Dependencies are inferred from the claim text.