초록 ▼

An exhaust gas purification device of a compression-ignition combustion engine comprises exhaust branch passages each being connected to a corresponding cylinder of the engine at one end thereof and connected to a common exhaust passage at the other end thereof, and a filter arranged in at least one

An exhaust gas purification device of a compression-ignition combustion engine comprises exhaust branch passages each being connected to a corresponding cylinder of the engine at one end thereof and connected to a common exhaust passage at the other end thereof, and a filter arranged in at least one of the exhaust branch passages to trap particulates in the exhaust gas discharged from the engine. Pressure in the exhaust branch passage upstream of the filter is controlled to continuously make the pressure equal to or greater than a pressure in the exhaust branch passage downstream of the filter.

대표청구항 ▼

[ We claim:] [1.] An exhaust gas purification device of a compression-ignition combustion engine, said device comprising:exhaust branch passages each being connected to a corresponding cylinder of the engine at one end thereof and connected to a common exhaust passage at the other end thereof;a filt

[ We claim:] [1.] An exhaust gas purification device of a compression-ignition combustion engine, said device comprising:exhaust branch passages each being connected to a corresponding cylinder of the engine at one end thereof and connected to a common exhaust passage at the other end thereof;a filter arranged in at least one of the exhaust branch passages to trap particulates in the exhaust gas discharged from the engine;pressure control means for controlling a pressure in the exhaust branch passage upstream of the filter to continuously make the pressure equal to or greater than a pressure in the exhaust branch passage downstream of the filter; andpressure increasing means for increasing a pressure of the exhaust branch passage downstream of the filter to a pressure level that is sufficiently high for the exhaust gas to flow back from the exhaust branch passage downstream of the filter to the exhaust branch passage upstream of the filter. [14.] An exhaust gas purification device of a compression-ignition combustion engine, the device comprising:exhaust branch passages each being connected to a corresponding cylinder of the engine at one end thereof and connected to a common exhaust passage at the other end thereof;a filter disposed in at least one of the exhaust branch passages to trap particulate in the exhaust gas discharged from the engine;a pressure controller that controls a pressure in the exhaust branch passages upstream of the filter to continuously make the pressure equal to or greater than a pressure in the exhaust branch passages downstream of the filter; anda pressure increaser that increases a pressure of the exhaust branch passage downstream of the filter to a pressure level that is sufficiently high for the exhaust gas to flow back from the exhaust branch passage downstream of the filter to the exhaust branch passage upstream of the filter. An exhaust gas purification device according to claim 14, wherein the pressure controller comprises a communication passage which communicates the exhaust branch passages upstream of the filter with each other, and the pressure increaser comprises a valve disposed in the communication passage. An exhaust gas purification device according to claim 15, wherein the valve is closed when the pressure in the exhaust branch passage downstream of the filter is to be greater than the pressure in the exhaust branch passage upstream of the filter. An exhaust gas purification device according to claim 14, wherein the pressure increaser comprises a communication passage which communicates the exhaust branch passage downstream of the filter with another exhaust branch passage, and a valve arranged in the communication passage. An exhaust gas purification device according to claim 17, wherein the valve is opened when the pressure in the exhaust branch passage downstream of the filter is to be greater than the pressure in the exhaust branch passage upstream of the filter.