Device for catching and removing particulates for a diesel engine

Claim 1

A device for removing particulates in an exhaust gas in a diesel engine, said device comprising; a filter adapted to be disposed in an exhaust line for receiving said exhaust gas from said diesel engine and trapping said particulates included in said exhaust gas; heating means arranged adjacent to said filter for generating heat in said filter; means for supplying air into aid filter for incinerating said particulates; and means for controlling an amount of air flow for obtaining a desired incineration performance of said particulates trapped in said filter; wherein said air flow amount controlling means includes means for detection of a number of repetitions of an incineration process, and means for varying said air flow amount in accordance with said number of the repetitions of said incineration process.

Claim 2

A device for removing particulates in an exhaust gas in a diesel engine, said device comprising; a filter adapted to be disposed in an exhaust line for receiving said exhaust gas from said diesel engine and trapping said particulates included in said exhaust gas; heating means arranged adjacent to said filter for generating heat in said filter; means for supplying air into aid filter for incinerating said particulates; and means for controlling an amount of air flow for obtaining a desired incineration performance of said particulates trapped in said filter; wherein said air flow amount controlling means includes means for detection of a number of repetitions of an incineration process, and means for varying said air flow amount in accordance with said number of the repetitions of said incineration process.

Claim 3

A device for purifying particulates in an exhaust gas in a diesel engine, said device comprising; a filter adapted to be disposed in an exhaust line for receiving said exhaust gas from said diesel engine and trapping said particulates included in said exhaust gas; means for detecting an effective area of said filter before trapping of said particulates by said filter commences; means for determining an amount of air introduced into said filter for an incineration process, said determining means comprising: i.) a map having data of a speed of air flow with respect to a value of said effective area; and ii.) map calculation means for obtaining said desired air amount, from said detected value of the effective area and said map; means for detecting when a sufficient amount of said particulates is trapped by said filter; heating means arranged adjacent to said filter for generating heat in said filter; and means for supplying said determined amount of air into said filter for said incineration process.

Claim 4

A device for purifying particulates in an exhaust gas in a diesel engine, said device comprising; a filter adapted to be disposed in an exhaust line for receiving said exhaust gas from said diesel engine and trapping said particulates included in said exhaust gas; means for detecting an effective area of said filter before trapping of said particulates by said filter commences; means for determining an amount of air introduced into said filter for an incineration process, said determining means comprising: i.) a map having data of a speed of air flow with respect to a value of said effective area; and ii.) map calculation means for obtaining said desired air amount, from said detected value of the effective area and said map; means for detecting when a sufficient amount of said particulates is trapped by said filter; heating means arranged adjacent to said filter for generating heat in said filter; and means for supplying said determined amount of air into said filter for said incineration process.

Claim 5

A device for purifying particulates in exhaust gas in a diesel engine, said device comprising: a filter arranged in an exhaust line for receiving the exhaust gas from the diesel engine, the filter being capable of trapping particulates included in the exhaust gas; heating means arranged adjacent to the filter for generating heat in the filter; a by-pass pipe connected to the exhaust line for by-passing the filter; valve means for switching between a first condition where the exhaust gas is passed through the filter without passing through the by-pass pipe and a second condition where the exhaust gas is passed through the by-pass pipe without passing through the filter, the valve means being usually in its first condition for trapping the particulates in the exhaust gas; means connected to the filter for introducing a forced flow of air for incineration of the particulates in the filter; means for detection of the clogged state of the filter by which a incineration process of the filter is required; means, responsive to the detection of the clogging state, for commencing the incineration process by operating the valve means to take its second condition for by-passing the filter and by operating the heater means, and said forced flow introducing means; means, upon the end of the incineration process, for determining a value of an effective flow area of the filter of the exhaust gas; and means for determining the amount of the air introduced into the filter for the incineration process in accordance with the detected value of the effective area before commencement of a new trapping in such a manner that a speed of the air passed through the filter to obtain a desired particulate trapping performance is obtained.

Claim 6

A device for purifying particulates in exhaust gas in a diesel engine, said device comprising: a filter arranged in an exhaust line for receiving the exhaust gas from the diesel engine, the filter being capable of trapping particulates included in the exhaust gas; heating means arranged adjacent to the filter for generating heat in the filter; a by-pass pipe connected to the exhaust line for by-passing the filter; valve means for switching between a first condition where the exhaust gas is passed through the filter without passing through the by-pass pipe and a second condition where the exhaust gas is passed through the by-pass pipe without passing through the filter, the valve means being usually in its first condition for trapping the particulates in the exhaust gas; means connected to the filter for introducing a forced flow of air for incineration of the particulates in the filter; means for detection of the clogged state of the filter by which a incineration process of the filter is required; means, responsive to the detection of the clogging state, for commencing the incineration process by operating the valve means to take its second condition for by-passing the filter and by operating the heater means, and said forced flow introducing means; means, upon the end of the incineration process, for determining a value of an effective flow area of the filter of the exhaust gas; and means for determining the amount of the air introduced into the filter for the incineration process in accordance with the detected value of the effective area before commencement of a new trapping in such a manner that a speed of the air passed through the filter to obtain a desired particulate trapping performance is obtained.