Exhaust emission control device of internal combustion engine
A technology of exhaust emission and control device, applied in electrical control, exhaust device, engine control and other directions, can solve the problems of overheating of DPF, low temperature of DPF, suspension of temperature rise control, etc.
Inactive Publication Date: 2008-12-03
MITSUBISHI MOTORS CORP
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Problems solved by technology
[0008] However, using the exhaust emission control method and device of Japanese Patent Application Publication No. 2003-155913, the temperature control after the DPF temperature exceeds the predetermined value is no longer implemented, so the following problems arise: when the DPF temperature rise is restored due to the temperature drop, even if the temperature is passed The heating device (DOC) such as adding fuel to it will increase the temperature of the DPF, but the temperature of the DPF will still be too low due to the delay in the reaction of the heating device
Therefore, the temperature does not increase effectively and it takes a lot of time until DPF regeneration actually occurs
Also, if the temperature of the DPF exceeds a predetermined temperature, or if the temperature rise gradient exceeds a predetermined gradient, the control of the temperature rise is suspended
However, the response (result) of the temperature rise control before the control is stopped will not be reflected in the next temperature rise control, so there is a problem that the DPF may overheat
Method used
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Embodiment
[0028] figure 1 is a schematic structural view showing a diesel engine exhaust emission control device according to an embodiment of the present invention. figure 2 It is the temperature control flow chart of DPF forced regeneration. image 3 is a graph showing an example of temperature control of the DPF.
[0029] Such as figure 1 As shown, a multi-cylinder diesel engine (hereinafter referred to as an engine) 1 has a cylinder head 2 and a cylinder block 3 . A piston 4 is fitted in the bore of each cylinder block 3 so that it can move in a reciprocating manner. The combustion chamber 5 is formed by the top surface of the piston, the wall surface of the cylinder bore, and the lower surface of the cylinder head.
[0030] An intake port 7 opened and closed by an intake valve 6 is formed in the cylinder head 2 , and an intake port 8 including an intake manifold is connected to the intake port 7 . An exhaust port 10 opened and closed by an exhaust valve 9 is formed in the cyl...
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An exhaust gas emission control device of an internal combustion engine comprises: DPF (17), provided in an exhaust passage (11) of a diesel engine (1), for trapping a particulate in an exhaust gas; ECU (30) for determining whether regeneration of DPF is necessary or not; temperature raising means (16, 30), such as post-injection, for raising the DPF temperature when the ECU determines that the regeneration is necessary; and a temperature sensor (22) for detecting the DPF temperature, and stops control for temperature raise by the temperature raising means, if the DPF temperature detected by the temperature sensor (22) becomes a predetermined temperature or higher when temperature raise control over DPF by the temperature raising means is exercised. If the DPF temperature is the predetermined temperature or higher and a DPF temperature gradient has a negative value, the temperature raising means restores temperature raise control over DPF.
Description
technical field [0001] The present invention relates to an exhaust gas emission control device of an internal combustion engine (hereinafter referred to as engine), and more specifically relates to an exhaust gas emission control device equipped with a diesel particulate filter (hereinafter referred to as DPF) on the exhaust system of a diesel engine. Background technique [0002] Exhaust gas discharged from a diesel engine contains pollutants such as hydrocarbons (HC), hydrocarbon oxides (CO), nitrogen oxides (NOx), and particulate matter (PM; hereinafter referred to as fine particles). In order to suppress air pollution by these substances, combustion technologies such as exhaust gas recirculation (hereinafter referred to as EGR) and common rail type high-pressure fuel injection, or post-treatment technologies using diesel oxidation catalysts (hereinafter referred to as DOC) or DPF have been developed . [0003] DPF is a filter installed in the middle of the engine exhaus...
Claims
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IPC IPC(8): F01N3/02
CPCF02D41/405F02D41/1446F01N11/002F02D2200/0804F01N3/0253F01N2013/026Y02T10/47F02D41/0245F02D41/029Y02T10/44F01N9/002F01N3/035F01N2250/06F01N2560/06F01N2430/06Y02T10/26F01N3/023F01N2550/04F01N13/0097Y02T10/12Y02T10/40
Inventor 仓田和朗饭塚章近藤浩司信原惠
Owner MITSUBISHI MOTORS CORP