Vehicle exhaust gas reduction system and method thereof
AssigneesHyundai Motor Company, Kia Corporation
InventorSungmu Choi
Life of this patent
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Abstract
A vehicle exhaust gas reduction system positioned in an exhaust system of an engine includes: an electrically heated catalyst (EHC) of heating exhaust gas of the engine by electrically generating heat; a sub-gasoline particulate filter (Sub GPF) heated by operation of the EHC to combust a particulate number (PN) included in the exhaust gas; a main gasoline particulate filter (Main GPF) of purifying the exhaust gas discharged from the engine; and a controller configured for performing PN reduction control by operating the EHC to be On in a low-temperature condition, and increasing a temperature of the Sub GPF to a reference temperature at which soot combustion is possible, combusting the PN passing through the Sub GPF and soot collected in the Sub GPF.
Claims18
A vehicle exhaust gas reduction system positioned in an exhaust system of an engine the vehicle exhaust gas reduction system comprising:
- an electrically heated catalyst (EHC) of heating exhaust gas of the engine by electrically generating heat;
- a sub-gasoline particulate filter (Sub GPF) heated by operation of the EHC to combust a particulate number (PN) included in the exhaust gas;
- a main gasoline particulate filter (Main GPF) of purifying the exhaust gas discharged from the engine;
- and
- a controller configured for performing PN reduction control by operating the EHC to be On in a low-temperature condition, and increasing a temperature of the Sub GPF to a reference temperature at which soot combustion is possible, combusting the PN passing through the Sub GPF and soot collected in the Sub GPF.
A controlling method of a vehicle exhaust gas reduction system including a sub-gasoline particulate filter (Sub GPF) provided behind an electrically heated catalyst (EHC) and a main gasoline particulate filter (Main GPF) provided behind the Sub GPF, the method comprising:
- starting, by a controller, an operation of the EHC to be On to heat up exhaust gas of an engine when a low-temperature condition is satisfied;
- measuring, by the controller, a temperature of the Sub GPF provided behind the EHC through a temperature sensor;
- performing, by the controller, particulate number (PN) reduction control to heat up the temperature of the Sub GPF to satisfy a reference temperature at which soot combustion is possible by adjusting a power supply amount of the EHC based on the temperature of the Sub GPF;
- and
- checking, by the controller, an engine operation time from start time of the PN reduction control, and ending, by the controller, the operation of the EHC by turning off power of the EHC when the engine operation time elapses a reference time.
A method of controlling a vehicle exhaust gas reduction system including a sub-gasoline particulate filter (Sub GPF) provided behind an electrically heated catalyst (EHC) and a main gasoline particulate filter (Main GPF) provided behind the Sub GPF, the method comprising:
- starting, by a controller, an operation of the EHC to be On to heat up exhaust gas of an engine when a low-temperature condition is satisfied;
- checking, by the controller, a resistance of the EHC which is correlated with a temperature of the Sub GPF through a resistance sensor;
- performing, by the controller, particulate number (PN) reduction control to heat up the temperature of the Sub GPF to satisfy a reference temperature at which soot combustion is possible by adjusting a power supply amount of the EHC based on the resistance of the EHC;
- and
- checking, by the controller, an engine operation time from start time of the PN reduction control, and ending the operation of the EHC by turning off power of the EHC when the engine operation time elapses a reference time.
Dependencies are inferred from the claim text.