Exhaust gas purifying device of internal combustion engine

An exhaust gas purification device and internal combustion engine technology, applied in exhaust devices, internal combustion piston engines, noise reduction devices, etc., can solve the problems of inability to send out air from the reductant injection device, increase of particles and unburned fuel, and difficulty in reaction, etc., to achieve suppression Generation of particulates and discharge of unburned fuel, good spray state, and effects of eliminating waste
CN1938499AInactive Publication Date: 2007-03-28KOMATSU LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
KOMATSU LTD
Publication Date
2007-03-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

An exhaust emission control device of an internal combustion engine capable of satisfactorily atomizing a reducing agent and surely securing combustion air. Since the controller of the exhaust emission control device controls the nozzle opening of a variable discharge turbo for spraying urea water, even when the engine is in a low load area of T1 to T2 and a supercharging pressure does not rise normally, the supercharging pressure P suitable for spraying the urea water can be provided by controlling the nozzle opening of the variable discharge turbo so as to be closed more than a normal one (chain double-dashed line), and the urea water can be securely atomized by a part of the supercharging air. Also, since the amount of combustion air supplied to the engine is increased by raising the supercharging pressure to P, satisfactory combustion can be realized and the generation of particulates and the discharge of unburned fuel can be suppressed.
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Description

[0001] technology area

[0002] The present invention relates to an exhaust gas purifying device for an internal combustion engine, and in particular, to an exhaust gas purifying device that is installed in an exhaust gas passage of an internal combustion engine with a variable exhaust turbocharger and purifies exhaust gas by supplying a reducing agent. Background technique

[0003] Currently, it is known that in order to collect particulates (particulate matter) in exhaust gas discharged from internal combustion engines such as diesel engines and reduce NO X amount, and an exhaust gas purification device is installed in the exhaust gas passage of the internal combustion engine.

[0004] As an exhaust gas purification device that collects particulates, a device equipped with a diesel particulate filter (DPF: Diesel Particulate Filter) is being developed as a means of reducing NO X (nitrogen oxides) exhaust gas purification device, equipped with NO X Reduction catalyst and NO...

Claims

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