Exhaust Gas Purification System for Internal Combustion Engine
First Claim
1. An exhaust gas purifying system of an internal combustion engine, comprising:
- an exhaust gas purifying device provided in an exhaust passageway of said internal combustion engine, purifying an exhaust gas passing through said exhaust passageway and with its temperature increased to a predetermined temperature or higher with the result that purifying capability thereof is improved;
exhaust gas temperature increasing unit provided on an upstream side of said exhaust gas purifying device in said exhaust passageway; and
reducing agent adding unit provided on the upstream side of said exhaust gas temperature increasing unit in said exhaust passageway and adding a reducing agent to the exhaust gas passing through said exhaust passageway,wherein said exhaust gas temperature increasing unit includes;
an exhaust gas temperature increasing catalyst provided in a single exhaust pipe configuring said exhaust passageway so that an exhaust gas flow-through area trough which the exhaust gas should pass is left, supplied with the reducing agent added from said reducing agent adding unit and thereby emitting heat; and
an exhaust gas flow rate control device controlling, in the exhaust gas passing through said exhaust pipe, allocation of a quantity of the exhaust gas passing said exhaust gas flow-through area and a quantity of the exhaust gas passing through said exhaust gas temperature increasing catalyst.
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Accused Products
Abstract
An exhaust passageway of the internal combustion engine is formed of a single exhaust pipe 5. A portion 11b configuring a passageway through which the exhaust gas passes and a portion 11c provided with a catalyst 11e heating up the exhaust gas by emitting heat upon being supplied with a reducing agent, are provided in parallel so as to share a section of the single exhaust pipe with each other on an upstream side 11 of an exhaust gas purifying device 10 in the exhaust pipe 5. In the exhaust gas flowing through the exhaust pipe 5, allocation of a quantity of the exhaust gas passing through the catalyst 11e and a quantity of the exhaust gas passing through the passageway 11b, is set changeable.
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Citations
16 Claims
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1. An exhaust gas purifying system of an internal combustion engine, comprising:
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an exhaust gas purifying device provided in an exhaust passageway of said internal combustion engine, purifying an exhaust gas passing through said exhaust passageway and with its temperature increased to a predetermined temperature or higher with the result that purifying capability thereof is improved; exhaust gas temperature increasing unit provided on an upstream side of said exhaust gas purifying device in said exhaust passageway; and reducing agent adding unit provided on the upstream side of said exhaust gas temperature increasing unit in said exhaust passageway and adding a reducing agent to the exhaust gas passing through said exhaust passageway, wherein said exhaust gas temperature increasing unit includes; an exhaust gas temperature increasing catalyst provided in a single exhaust pipe configuring said exhaust passageway so that an exhaust gas flow-through area trough which the exhaust gas should pass is left, supplied with the reducing agent added from said reducing agent adding unit and thereby emitting heat; and an exhaust gas flow rate control device controlling, in the exhaust gas passing through said exhaust pipe, allocation of a quantity of the exhaust gas passing said exhaust gas flow-through area and a quantity of the exhaust gas passing through said exhaust gas temperature increasing catalyst. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification