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Exhaust gas purifying device

A technology of exhaust purification device and exhaust passage, applied in exhaust device, exhaust treatment, muffler device, etc., can solve problems such as damage to engine lubrication, and achieve the effect of high-efficiency regeneration

Inactive Publication Date: 2007-09-12
HINO MOTORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the engine oil forming a lubricating film on the inner wall surface of the cylinder is diluted by the above-mentioned injected fuel, so there is a problem that the lubrication of the engine is impaired, and a sufficient amount of fuel cannot be supplied to the filter by the post-injection.

Method used

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Experimental program
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Effect test

no. 1 approach

[0034]1 and 2, the intake port 12a of the diesel engine 11 is connected to an intake pipe 13b via an intake manifold 13a, and the exhaust port 12b is connected to an exhaust pipe 14b via an exhaust manifold 14a. A NOx storage reduction catalyst 16 is provided in the middle of the exhaust pipe 14b. The NOx storage reduction catalyst 16 is a platinum-barium-oxidation catalyst that stores NOx in the exhaust gas flowing into the exhaust pipe 14b and releases the stored NOx when the concentration of oxyhydroxide (HC) in the exhaust gas increases to perform regeneration treatment. aluminum catalyst. Although not shown in the figure, the catalyst 16 actually has a monolithic carrier made of cordierite and a coating layer. The monolithic carrier has grid-shaped or honeycomb-shaped passages formed in the direction of exhaust gas flow, and the coating layer forms The NOx storage agent and noble metals (active metals) are carried on the integral carrier. In addition, examples of active...

no. 2 approach

[0044] Fig. 4 shows a second embodiment of the present invention.

[0045] In this embodiment, the post-injection is performed such that the injection amount gradually decreases from the first to the third post-injection. In other words, the injection amount of the first post-injection among the three post-injections is set to be the largest, the injection amount of the second after-injection is set to be smaller than that of the first time, and the injection amount of the third after-injection is set to be smaller than that of the first time. set smaller. In addition, the total injection amount of the post-injection is the same as the total injection amount of the post-injection in the first embodiment. Except for the above configuration, it is the same as the first embodiment.

[0046] In the exhaust purification system constructed in this way, even if the first post-injection amount is large, since the temperature in the cylinder is extremely high, the injected fuel evapo...

no. 3 approach

[0048] Fig. 5 shows a third embodiment of the present invention.

[0049] In this embodiment, the post-injection is performed in five steps, and the first post-injection is performed at a crank angle of approximately 90 degrees. Moreover, the 2nd to 5th post-injections are performed at equal intervals in the expansion stroke. In this embodiment, these post-injections occur every 15 degrees or so of crank angle. In addition, the total injection amount from the first to the fifth time of the post-injection is the same as the total injection amount from the first to the third time of the after-injection in the first embodiment. Except for the above configuration, it is the same as the first embodiment.

[0050] In the exhaust purification system configured in this way, since the injection amount of each post-injection is smaller than that of the first embodiment, the after-injection can be prevented more reliably than in the first embodiment. The injected fuel adheres to the i...

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PUM

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Abstract

A NOx occluding reduction catalyst that occludes NOx is efficiently regenerated by carrying our post-injection of a necessary and sufficient quantity of fuel without diluting engine oil on the inner wall surface of a cylinder. A NOx absorbing agent and an active metal are carried on the NOx occluding reduction catalyst (16) provided in an exhaust gas passage (14) of an engine (11), and the fuel is supplied to the NOx occluding reduction catalyst (16) by adding the fuel to the exhaust gas in the exhaust gas passage (14) with a fuel adding means (17). The fuel adding means (17) is an accumulator fuel injector that carries out post-injection, following main injection into a cylinder (22) of the engine (11), at timing such that the fuel does not ignite in the cylinder (22). The post-injection with the accumulator fuel injector (17)is carried out in divided 3 to 20 times at the later period of the expansion stroke of the engine (11) .An exhaust emission control device capable of efficiently regenerate an NOx storage / reduction type catalyst storing NOx by post-injecting sufficient amount of a fuel without diluting an engine oil on the inner wall surface of a cylinder. An NOx absorber and an activated metal are carried on the NOx storage / reduction type catalyst (16) installed in the exhaust passage (14) of an engine (11), and a fuel adding means (17) adds the fuel into an exhaust gas inside the exhaust passage (14) to supply the fuel to the NOx storage / reduction type catalyst (16). The fuel adding means (17) is an accumulator fuel injection device post-injecting the fuel after a main injection to the cylinder (22) of the engine (11) at such a timing that the fuel is not ignited in the cylinder (22). The post-injection by the accumulator fuel injection device (17) is performed in three to twenty times in the latter period of the expansion stroke of the engine (11).

Description

technical field [0001] The present invention relates to an apparatus for purifying exhaust gas by sequestering NOx contained in engine exhaust gas with a NOx occlusion reduction catalyst, and regenerating the catalyst. Background technique [0002] In the prior art, there is disclosed an engine exhaust purification device in which a filter for capturing particles is provided in the exhaust passage, and when the filter is regenerated, the filter is regenerated (for example, refer to Patent Document 1). . In order to achieve a constant target regeneration speed in filter regeneration, this engine exhaust purification system is provided with a regeneration mechanism that performs post-injection twice per engine cycle and exhaust oxygen concentration control. Post-injection is performed by a common rail fuel injection device. In addition, the regeneration processing cycle performed by the regeneration processing mechanism of the filter includes the early stage, the middle stag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N3/36B01D53/94F02D41/38F01N3/24F02M45/02
CPCF01N2610/03B01D2255/2042F02D41/0275F02D41/1446B01D2255/1021B01D53/9422B01D2255/915B01D2251/202B01D2251/208B01D2255/1025F01N2430/085Y02T10/44B01D2255/91F02D41/405F02D41/402B01D2255/1023B01D2251/204F02D2250/11Y02T10/40
Inventor 横田治之
Owner HINO MOTORS LTD