JPH06212949A - Diesel particulate filter and power supply apparatus - Google Patents

Abstract

PURPOSE:To provide a compact high efficiency power source device to save electric power for a filter for catching and burning up diesel particulates. CONSTITUTION:Filter plates 11 and heat generating bodies 12 consisting of a perforated body of ceramics overlap alternately with each other to provide a laminated body forming a filter block 10, while the laminated body is constituted to connected in series the heat generating bodies 12 so that the filter plates have high temperature sequentially toward an outlet in the burning-up process. Also, a rotary magnet type generator 2 is used for a power source to be driven by an engine and supply the generated output to the heat generating body 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diesel particulate filter and a power supply device for removing particulate matter contained in exhaust gas of a diesel engine.

[0002]

2. Description of the Related Art A diesel engine injects fuel, and air is taken into the jet to perform combustion, so that a uniform mixture is not produced and carbon monoxide and hydrocarbons are less emitted, but NOx And a large amount of particulate emissions,
These reductions are the challenges for diesel engines.

This particulate is a compound of carbon and hydrocarbon contained in the exhaust gas, and its size is dispersed from several μm to several tens of μm. A filter is attached and the collected sediment is incinerated.

[0004]

As described above, incineration of the deposits collected by the filter requires high temperature and exhaust gas temperature is insufficient, so electric power is used as heating energy, but large electric power is required. Therefore, the capacity of an ordinary on-vehicle DC or AC generator is insufficient, and if the capacity is increased, the mounting becomes difficult. Therefore, in a normal particulate filter, since a particulate heat generating portion is provided to incinerate the particulate, combustion is unbalanced and the filter body is often damaged by the thermal stress.

Therefore, the present invention has been made in view of the above problems, and an object thereof is to save power while incinerating particulates requiring a large amount of power, in consideration of the configuration of the filter and the energizing method, It is an object of the present invention to provide a diesel particulate filter and a power supply device that attempt to solve conventional problems by using an efficient power generation system.

[0006]

In order to achieve the above object, according to the present invention, in a diesel particulate filter and a power supply device for collecting particulates in exhaust gas of a diesel engine and incinerating them by electric heat,
For a filter block in which a filter plate made of porous ceramics and a heating element by energization are alternately stacked to form a multilayer body and these heating elements are connected in series, an engine-driven rotating magnet type generator or turbocharger is used. There is provided a diesel particulate filter and a power supply device for supplying a power generation output of any one of the rotating magnet type rotating electric machine arranged in.

[0007]

[Function] Since the filter plate and the power generator are multilayered and the power generators are connected in series and the temperature of the filter plate is gradually increased toward the outlet during the incineration process, the incineration process with small electric power can be performed. Moreover, since a rotating magnet type power generation mechanism is used as a power source, various losses are reduced, and a small size and high efficiency can be obtained.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a diesel particulate filter and a power supply device according to the present invention. In the figure, 1 is a particulate filter (filter), and the filter block 10 is made by impregnating a slurry of ceramics into, for example, a urethane home plate,
Filter plate 11 formed into a slightly rough porous body by sintering
Heating element 12 having a predetermined electric resistance
And the heating elements 12 are electrically connected in series as shown. The shape of the heating element 12 is, for example, as shown in (A) of the figure, having a plurality of elongated strip-shaped gaps 121 parallel to the passage direction of the current, and the gas flow passes through these gaps 121. Formed in
When the power is supplied from a power source, which will be described later, the temperature of the filter plate 11 is sequentially increased in the passing direction of the gas flow.

The periphery of the filter block 10 is covered with a heat insulating material 13 made of ceramic fiber, and is housed in a filter cover 14 having a narrowed upstream / downstream direction.
It is attached to the exhaust passage by a flange 15 provided upstream. It should be noted that reference numerals 16 and 17 denote heating element mounting portions serving as terminals, which are held by insulating bushes 18 having heat resistance.

Reference numeral 2 is a generator capable of efficiently obtaining a large output, and its rotor 21 is a permanent magnet having a strong magnetic force.
The pulley 22 driven by the engine is speeded up by the planetary gear mechanism 23, and the outer wall of the rotor 21 has no irregularities and no brush is required, so that large power is generated with low loss. ing.

Reference numeral 3 denotes a power control device having an electronic circuit, which is a temperature sensor 31 provided in the latter half of the filter 1.
Based on the temperature signal from the
The heating element 12 is energized to maintain the temperature of the subsequent stage of the filter block 10 at, for example, about 600 ° C., and the collected particulates are sufficiently incinerated.

Next, the operation of this embodiment having the above-described structure will be described. Exhaust gas is upstream of the filter block 10 in which a plurality of filter plates 11 heated by the electric power of the generator 2 serving as a power source are arranged. When guided from the direction, the gas body collides with the porous ceramic material and twists and advances in the downstream direction, but the granular material is gradually collected due to the roughening of the filter and almost reaches the downstream. It is collected and only the gas component is discharged from the downstream outlet.

Then, the exhaust gas temperature at the inlet is set to, for example, 30
When the temperature is set to about 0 ° C., the filter plate 11 heated by the heating element 12 gradually rises as the gas passes, and the filter plate temperature gradually increases toward the particulate ignition temperature of 600 ° C. Therefore, in the latter stage of the filter block 10, combustion is started and incinerated.

Therefore, by controlling the electric power supplied from the generator 2 in accordance with the temperature signal from the temperature sensor 31, the incineration of the particulates trapped in the filter block 10 is sufficient regardless of the exhaust temperature. You can do it.

FIG. 2 is a block diagram showing a power supply device according to another embodiment of the present invention. Reference numeral 4 shown in the drawing is a turbocharger, which is a turbine 41 driven by the exhaust gas energy of the engine and a torque of the turbine. And a compressor 42 that rotates according to the present invention, and the compressed air of the compressor is pressure-fed to the engine as supercharged air to improve the engine torque. Reference numeral 5 denotes a rotating electric machine attached to the rotating shaft of the turbine 41, and its rotor 51 is made of a strong permanent magnet, and a magnetic flux is linked to the stator 52 when driven by the turbine torque to generate a power generation output similar to that of the electronic device described above. Power is transmitted to the heating element 12 via the control device 3 to heat the filter block 10 to a predetermined temperature.

Therefore, when the engine is operating at high speed and the exhaust energy is large, the particulates can be sufficiently burned by switching the output of the generator 2 in the above-described embodiment and using the output of the rotary electric machine 5. Become.

Although the present invention has been described with reference to the above embodiments, various modifications and applications are possible within the scope of the gist of the present invention, and these modifications and applications are not excluded from the scope of the present invention. Absent.

[0019]

According to the present invention as in the above embodiments,
Coarse porous ceramics are used for the filter plate, and they are stacked alternately with the heating plates to form a multilayer body, and the heating elements are connected in series so that the temperature of the downstream filter plates becomes higher during the incineration process. Since it is configured as described above, a power-saving filter system can be obtained, and since a rotating magnet type power generation mechanism is used as a power source, there is an effect that a small and highly efficient power supply device can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a power supply device according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Particulate filter 2 ... Generator 3 ... Electronic control unit 4 ... Turbocharger 5 ... Rotating electric machine 10 ... Filter block 11 ... Filter plate 12 ... Heating element 21 ... Rotor 23 ... Planetary gear mechanism

Claims (2)

[Claims] 1. A diesel particulate filter that collects particulates in exhaust gas of a diesel engine and incinerates them by electric heat, and a power supply device, wherein filter plates made of porous ceramics and heating elements that are energized are alternately stacked. Supplying the power generation output of either an engine-driven rotating magnet type generator or a rotating magnet type rotating electric machine arranged in a turbocharger to a filter block that is formed in a multilayer body and these heating elements are connected in series. Diesel particulate filter and power supply device. 2. The diesel particulate filter according to claim 1, wherein the filter block has a structure in which the temperature of the filter plate gradually increases toward the downstream side by passing exhaust gas and energizing the heating element during incineration. And power supply.