JPS60108519A - Device for regenerating particulate trapping filter in diesel-engine - Google Patents

Abstract

PURPOSE:To make it possible to aim at regenerating a particulate trapping filter even though the temperature of exhaust gas is low, by providing pipe lines for supplying a fuel additive into a fuel supply system, and as well by previously dispersing catalyst in particulates so that they are mixed together. CONSTITUTION:A particulate trapping filter 12 is disposed in an exhaust passage 11 in a Diesel-engine 1, and traps particulates from a fuel chamber 2 in the Diesel-engine. There are provided pipe lines 4, 8 connecting between a fuel additive supply device and the fuel supply system of the Diesel-engine 1 in order to mix a fuel additive into the particulates. Chloride of Pb, Cu, Ca, etc. is used as the fuel additive, which is trapped in the trapping filter 12 in such a condition that it is contained in the particulates.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a particulate collection filter regeneration device for a diesel engine.

Diesel engine exhaust gas contains particulate Y, which is a combustible, fine-grained carbonized compound, and is the main cause of black smoke in the exhaust gas. These particulates spontaneously ignite and burn when the exhaust gas temperature reaches 600°C or higher when the vehicle is running at high speed and under high load.
During steady driving or idling, where the temperature does not reach 0°C (which accounts for more than 90% of vehicle operation), it is directly released into the atmosphere.

However, since particulates are harmful to the human body, vehicles generally have a diesel particulate collection filter installed in their exhaust passages.

By the way, this filter tends to block the exhaust passage by collecting particulates, and in order to regenerate this filter, a device for re-burning the particulates is usually attached. For example, it is known that re-combustion can be carried out by using various burners, retarding the injection pump, and exhausting exhaust gas containing a large amount of carbon monoxide compounds that have been activated by an oxidation catalyst to make them highly combustible. ing.

However, such means have the following problems.

(1) Using a burner increases costs.

(2) In the case where the injection timing is significantly retarded and the exhaust temperature is increased, the catalytic effect on the surface of the particulate collection filter is reduced, and particulates do not burn unless the temperature is high.

The present invention aims to solve these problems, and by dispersing and mixing a catalyst in particulates in advance, particulate extraction can be achieved even at low exhaust temperatures.
An object of the present invention is to provide a particulate filter regeneration device for a diesel engine, which is capable of regenerating a filter.

For this reason, the diesel engine particulate v of the present invention
- The particulate collection filter regeneration device includes a particulate collection filter disposed in the exhaust passage of a diesel engine to collect particulates from the combustion chamber of the diesel engine, and adds a fuel additive to the particulates. A fuel additive supply device for supplying the fuel additive is provided in order to mix the fuel additive, and a pipe is provided for supplying the fuel additive from the fuel additive supply device to the fuel supply system of the diesel ennon. It is characterized by

Hereinafter, embodiments of the present invention will be explained with reference to the drawings.
Figures 1 to 5 show a particulate collection filter regeneration device for a diesel engine as a first embodiment of the present invention. Figure 1 is its overall configuration, and Figure 2 is its fuel piping (low pressure pipe). ), FIG. 3 is a schematic diagram showing the venturi type fuel additive supply device, and FIG. 4 is a sectional view showing the electromagnetic plunger pump type fuel additive supply device. , @5 is a cross-sectional view showing a natural fall type fuel additive supply device, and FIG. 6 is a sectional view showing a fuel pipe (high pressure pipe) of a particulate collection filter regeneration device for a diesel engine as a second embodiment of the present invention. ) is a configuration diagram showing a fuel additive supply device connected to the fuel additive supply device.

In the first embodiment of the present invention, as shown in FIG. Yes, this engine 1
A diesel particulate collection filter (hereinafter simply referred to as a filter) that is attached to the exhaust passage 11 of the engine 1 and collects particulates discharged from the combustion chamber of the engine 1.
12 is played.

An exhaust passage 11 is formed by connecting an exhaust manifold lla fixed to the engine 1, a filter 12, and a filter 77 via an exhaust pipe.

Note that the filter 12 is formed of, for example, a 7-ohm heat-resistant ceramic with a catalyst of the type 70-type.

Intake air from an air cleaner 10 enters the combustion chamber 2 of the engine 1 through an intake passage 9. It is supplied via the intake manifold 9a.

The high pressure fuel from the fuel injection pump 6 flows into the combustion chamber 2 or its auxiliary chamber through a high pressure pipe 8. It is supplied via an injection nozzle 7.

Fuel is supplied to the injection pump 6 from the fuel tank 3 via a feed line 4 and a fuel strainer 5, and the injection pump 6 and the fuel tank 3 are connected by a return line 4'1. I'm here.

These fuel tanks 3 and up to the combustion chamber 2 or the auxiliary chamber constitute a fuel supply system.

Further, the injection pump 6 is driven by the engine 1 via the engine 4.

Additionally, as shown in Figure 2, liquid fuel additives (Fue
lAdditive, hereinafter: Pb, Cu as "FAJ".

A fuel additive (FAE) supplying device 26 is provided to supply chlorides (or sulfates, oxides, nitrates, etc.) such as Ca, Ba, Mn, Co, and Fe. an electronic control unit (ECU) 3 as a fuel additive supply control means for controlling the supply timing and supply amount of the fuel additive;
(1 is provided.

The ECtJ3o is configured to detect the amount of fuel supplied by a flow sensor 56 interposed in a feed line 4 serving as a fuel pipe (low pressure pipe) between the fuel tank 3 and the fuel strainer 5.

The ECU 3O receives fuel flow rate information from the flow rate sensor M56 and outputs a control signal to operate the FA supply device 26.

Cart 1 containing fuel additive (FA) Supplying fuel additive from lunge (tank) 22 to feed line 4 F
The A supply device 26 may be one using an electromagnetic plunger pump 23 as a fixed displacement pump as shown in FIG. 4, or a natural fall type FA using an electromagnetic valve 24 as shown in FIG. A feeding device 26 is used.

The FA supply device 26 is connected to the downstream side of the flow rate sensor 56 in the feed line 4 via a pipe 66,
A return line 4' is connected to the downstream side of the connecting portion 67 between the pipe 66 and the feed line 4.

As the FA supply device 26, as shown in FIG. 3, one having a venturi 56' may be used.
8 and is supplied to the narrowest part 59 of the venturi via a pipe 66. At this time, ECU3O can be omitted.

Since the first embodiment of the present invention is configured as described above, in the ECt, I30, the FA is supplied to the fuel pipe (
can be fed to the feed line 4 as a low-pressure pipe).

As this FA-mixed fuel is burned in the combustion chamber 2, lumps of particulates gather in the exhaust passage 11 etc. and grow into a Pet aggregate (soot + unburned back hydrogen compounds, etc.) When doing so, F in this collection of Pct
A will be dispersed and mixed as appropriate.

The particulate aggregate containing FA is collected by the particulate collection filter 12, and when the inlet temperature of the filter 12 reaches 2 (1 to 300°C), the filter 12 is regenerated. is carried out.

At this time, the unburned remains of the FA remain in the particulate collection filter 12 and are not released into the atmosphere.

Furthermore, in the second embodiment of the present invention, as shown in FIG.
A pipe 66 is connected from the FA cartridge') 22 to the high pressure pipe 8 of the fuel supply system that connects the injection pump 6 and the injection nozzle 7.
FA is supplied through the pipe 66', and an on-off valve 60 and a check pal flow 1 are installed in the pipe 66', and the other configurations are almost the same as in the first embodiment. be.

In this second embodiment, PA is supplied into the fuel in response to pressure changes due to pulsations in the high-pressure pipe 8, and it is possible to obtain almost the same effect as the first embodiment. Ru.

Note that as the on-off valve 60, an electromagnetic plant pump 23 as shown in FIG. 4 may be used.

As described in detail below, the particulate collection filter regeneration device for a diesel engine of the present invention is arranged in the exhaust passage of a diesel engine to collect particulates from the combustion chamber of the diesel engine. In order to mix the fuel additive into the particulates, a fuel additive supply device is provided, which is equipped with a particulate collection filter, and which supplies the fuel additive to the particulates. With a simple configuration in which piping is provided to supply the diesel engine to the fuel supply system of the diesel engine, the following effects and advantages can be obtained.

(1) A fuel additive (FA) can be dispersed and mixed into the particulates collected by the particulate collection filter.

(2) Due to the above item 1, the function as a catalyst is maintained at an extremely high level, and the particulates collected in the particulate collection filter are combusted at a lower temperature (200 to 300 degrees Celsius) than conventional regenerators. This makes playback easier.

(3) It is possible to reliably prevent melting and damage of the particulate collection filter.

[Brief explanation of the drawing]

1 to 5 show a particulate 1 collection filter regeneration device for a diesel engine as a first embodiment of the present invention. FIG. 1 is an overall configuration diagram thereof, and FIG. FIG. 3 is a schematic diagram showing a venturi type fuel additive supply device, and FIG. 4 is an electromagnetic plunger pump type fuel additive supply device. 5 is a sectional view showing a natural fall type fuel additive supply device, and FIG. 6 is a sectional view showing a fuel additive supply device for a diesel engine particulate collection filter as a second embodiment of the present invention. FIG. 2 is a configuration diagram showing a fuel additive supply device connected to piping (high pressure pipe). 1. Engine, 2. Combustion chamber, 3. Fuel tank, 4
...Feed line as fuel pipe (low pressure pipe), 4'
...Return line, 5.Fuel strainer, 6.Injection pump, 7.Injection nozzle, 8.High pressure pipe as fuel piping (high pressure pipe), 9.Intake passage, 9a.Intake manifold, 10. ...Air cleaner, 11..Exhaust passage, 1ja..Exhaust manifold, 12..Particulate collection filter, 13..77, 14..Pulley mechanism, 22..Fuel additive (FA) cartridge (tank) ), 23...Solenoid plunger pump, 24...Solenoid valve,
26...Fuel additive (FA) supply device, 30...Electronic control unit (ECU) constituting fuel additive supply control means
), 39... Filler cap, 40... Filler cap, 56... Flow rate sensor, 56'... Venturi, 5
8. Orifice, 59. Narrowest part of venturi, 60.
・On/off valve, 61...Check valve, 66.
66'...Piping, 67...Connection. Agent Patent attorney Yoshihiko Iinuma Figure 1 Figure 2 Figure 2 1 6 Figure 4 Figure 5 Figure 6 Figure 6 Figure 2 ↓ Procedural amendment (method) % formula % 1 Indication of case 1982 Patent application No. 214691 2 Invention Relationship with 4 persons who have corrected the name - f easel engine particulate ml filter regeneration device Applicant 4 flight number 108 1 location 5-33-8 Shiba, Minato-ku, Tokyo Name (628) Mitsubishi Motors Corporation Co., Ltd. - Embedded number 3 160 1 5-3-6 Minamimotomachi, Shinjuku-ku, Tokyo Full text of the specification subject to amendment. 7. Contents of amendment The entire text of the specification will be amended as shown in the attached sheet in order to make the text larger. 8 List of attached documents Full text amendment specification 1 Written amendment 1 Indication of case 1982 Patent application No. 214691 2 Title of invention Particulate collection filter regeneration device for diesel engine 3 Person making the amendment Relationship with the case Application Postal code 108 Address 5-33-8 Shiba, Minato-ku, Tokyo Name (628) Mitsubishi Motors Corporation 4 Agent Postal code 160 Address 5-3'5 Minamimotomachi, Shinjuku-ku, Tokyo Date of amendment order (voluntary) Amendment) 6. Detailed description of the invention in the specification subject to amendment. 7. Contents of the amendment The full text amended specification submitted on March 7, 1982 (the full text of the specification is enlarged) will be amended as follows. (1) The value 1 stated in lines 2 to 3 of page 2 of the specification (when the vehicle is running at high speed and under high load) is corrected to "when the vehicle is running at high speed and under high load when the load is over". (2) "Because it is harmful" written in line 7 of page 2 of the specification is amended to "because it is likely to be harmful." (3) "It is installed." written in line 9 of page 2 of the specification is amended to "Research is being conducted to install it." (4) "Injection timing...no combustion" written in lines 2 to 5 on page 3 of the specification will be corrected as follows. "If the injection timing is significantly retarded and the exhaust temperature is raised by a catalyst, high particulate collection efficiency cannot be expected, and regeneration is difficult in the low speed and light load range where the exhaust temperature is low." (5 ) described on page 3, lines 7-8 of the specification [in advance...
・By mixing, delete ". (6) From the 16th line of page 4 of the specification to the first line of page 5, "installed in Figure 1" is replaced by "as shown in Figure 1, a diesel engine (hereinafter simply referred to as engine)". ) The exhaust passage 11 attached to 1 is corrected to -1. (7) ``Regenerates'' written on page 5, line 4 of the specification is provided with [. Correct to -1. (8) "Two-all 70 - . . . ◆ Ceramic foam" described on page 5, lines 8-9 of the specification is corrected to "wall reflow type monolith or ceramic foam with catalyst material".

Claims (1)

[Claims] A particulate collection filter is provided in the exhaust passage of the diesel engine to collect particulates from the combustion chamber of the diesel engine, and the fuel additive is added to the particulates in order to mix the particulates into the particulates. A fuel additive supply device for supplying a fuel additive is provided, and a pipe for supplying the fuel additive from the fuel additive supply device to a fuel supply system of the diesel engine is provided. Curate 11 fill reproduction device.