Exhaust purification device of internal combustion engine
An exhaust purification device and technology for exhaust purification, which are applied in the direction of exhaust device, electronic control of exhaust gas treatment device, internal combustion piston engine, etc., can solve problems such as the deterioration of precious metals, and achieve the effect of inhibiting deterioration
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no. 1 approach
[0037] "Description of the Internal Combustion Engine as a whole"
[0038] figure 1 It is a diagram schematically showing an internal combustion engine using the exhaust purification device of the first embodiment. Such as figure 1 As shown, the internal combustion engine 1 has an internal combustion engine main body 2, a cylinder block 3, a piston 4 reciprocating in the cylinder block 3, a cylinder head 5 fixed on the cylinder block 3, an intake valve 6, an intake port 7, and an exhaust valve 8 , Exhaust port 9. A combustion chamber 10 is formed between the piston 4 and the cylinder head 5 . The intake valve 6 opens and closes the intake port 7, and the exhaust valve 8 opens and closes the exhaust port 9. In addition, the internal combustion engine main body 2 is provided with a variable valve timing mechanism 28 that controls the valve timing of the intake valve 6 . In addition, the engine main body 2 may be provided with a variable valve timing mechanism for controllin...
no. 2 approach
[0102] Next, refer to Figure 10 An exhaust purification device according to a second embodiment will be described. The configuration and control of the exhaust purification device of the second embodiment are basically the same as the configuration and control of the exhaust purification device of the first embodiment. Hereinafter, the exhaust gas purification device of the second embodiment will be described focusing on portions different from those of the first embodiment.
[0103] When the deterioration of the exhaust purification catalyst 20 progresses as described above, the total surface area of the noble metal decreases due to sintering of the noble metal. As the total surface area of the noble metal becomes smaller in this way, the amount of unburned HC adsorbed on the surface of the noble metal also decreases accordingly. Therefore, when the deterioration of the exhaust purification catalyst 20 progresses, further deterioration of the exhaust purification catal...
no. 3 approach
[0112] Next, refer to Figure 11 and Figure 12 An exhaust purification device according to a third embodiment will be described. The configuration and control of the exhaust purification device of the third embodiment are basically the same as the configuration and control of the exhaust purification device of the first embodiment. Hereinafter, the exhaust purification device of the third embodiment will be described focusing on the parts different from those of the first embodiment.
[0113] As the amount of unburned HC adsorbed per unit surface area of the noble metal of the exhaust purification catalyst 20 increases, the catalytic effect of the noble metal decreases. In such a state, when a large amount of unburned HC flows into the exhaust purification catalyst 20 through fuel supply control, there is a possibility that part of the flowed unburned HC is not purified by the exhaust purification catalyst 20 and is directly purified from the exhaust gas. Catalyst 20 flo...
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