Method for regenerating exhaust gas purifying filter apparatus
First Claim
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1. A method for regenerating a filter of the type that traps particulate matter contained in exhaust gas of an internal combustion engine, the method comprising:
- increasing an amount of soot having a low degree of graphitization in the filter; and
increasing a temperature of the filter after the amount of the soot having the low degree of graphitization is increased,wherein the temperature of the filter is increased to a temperature at which the soot having the low degree of graphitization in the filter burns, andwherein the low degree of graphitization is defined as the degree of graphitization of soot generated when the engine operates at a high-rotation speed.
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Abstract
The present invention relates to a method for regenerating a filter that traps particulate matter contained in exhaust gas of an internal combustion engine. The regeneration method includes increasing an amount of soot having a low degree of graphitization in the filter. After the amount of soot having the low degree of graphitization is increased, a temperature of the filter is increased.
11 Citations
15 Claims
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1. A method for regenerating a filter of the type that traps particulate matter contained in exhaust gas of an internal combustion engine, the method comprising:
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increasing an amount of soot having a low degree of graphitization in the filter; and increasing a temperature of the filter after the amount of the soot having the low degree of graphitization is increased, wherein the temperature of the filter is increased to a temperature at which the soot having the low degree of graphitization in the filter burns, and wherein the low degree of graphitization is defined as the degree of graphitization of soot generated when the engine operates at a high-rotation speed. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for regenerating a filter of the type that traps particulate matter contained in exhaust gas of an internal combustion engine, the method comprising:
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operating the internal combustion engine under operating conditions that decrease an in-cylinder temperature or that shorten a time cylinder gas dwells in a cylinder; and increasing a temperature of the filter after the operating of the internal combustion engine is continued under the operating conditions for a predetermined time, wherein the temperature of the filter is increased to a temperature at which the soot having the low degree of graphitization in the filter burns.
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8. An apparatus for purifying exhaust gas from an internal combustion engine, comprising:
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a filter that traps particulate matter contained in exhaust gas of the internal combustion engine; and a controller connected to the internal combustion engine, wherein the controller operates the internal combustion engine so as to increase an amount of soot having a low degree of graphitization in the filter and, after the amount of the soot having the low degree of graphitization is increased, operates the internal combustion engine so as to increase a temperature of the filter, and wherein the controller operates the internal combustion engine so as to increase the temperature of the filter to a temperature at which the soot having the low degree of graphitization in the filter burns and wherein the low degree of graphitization is defined as the degree of graphitization of soot generated when the engine operates at a high-rotation speed. - View Dependent Claims (9, 10, 11, 12, 13)
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14. An apparatus for purifying exhaust gas from an internal combustion engine, comprising:
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a filter that traps particulate matter contained in exhaust gas of the internal combustion engine; and a controller connected to the internal combustion engine, wherein the controller operates the internal combustion engine under operating conditions that decrease an in-cylinder temperature or that shorten a time cylinder gas dwells in a cylinder and, after the operating of the internal combustion engine is continued under the operating conditions for a predetermined time, operates the internal combustion engine to increase a temperature of the filter, wherein the temperature of the filter is increased to a temperature at which the soot having the low degree of graphitization in the filter burns.
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15. Means for regenerating a filter of the type that traps particulate matter contained in exhaust gas of an internal combustion engine, comprising:
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means for increasing an amount of soot having a low degree of graphitization in the filter, and means for increasing a temperature of the filter up to a temperature at which the soot having the low degree of graphitization in the filter burns, after the amount of the soot having the low degree of graphitization in the filter is increased.
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Specification