# US 2021/0331111 A1 · Particulate filter and manufacturing method for same

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- Number: US 2021/0331111 A1
- Document ID: US20210331111A1
- Status: Published application
- Kind: A1
- Application number: 17/274,089
- Filed: 2019-09-05
- Published: 2021-10-28
- Earliest claimed: 2018-09-07
- Assignees: Isuzu Motors Limited
- Applicants: Isuzu Motors Limited
- Inventors: Yukihiro KAWASHIMA
- Web page: https://patentgrep.com/patent/US20210331111A1

## CPC

- B01D 46/247: {of the cells}
- F01N 3/021: by means of filters
- B01D 39/2068: {Other inorganic materials, e.g. ceramics}
- B01D 39/2075: {sintered or bonded by inorganic agents}
- B01D 46/0001: {Making filtering elements}
- B01D 46/2455: {of the whole honeycomb or segments}
- B01D 46/2478: {Structures comprising honeycomb segments}
- B01D 46/2484: {Cell density, area or aspect ratio}
- F01N 3/28: Construction of catalytic reactors
- F01N 3/2828: {Ceramic multi-channel monoliths, e.g. honeycombs}
- B01D 2279/30: for treatment of exhaust gases from IC Engines
- F01N 3/022: characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
- F01N 3/023: using means for regenerating the filters, e.g. by burning trapped particles
- F01N 2330/06: Ceramic, e.g. monoliths
- F01N 2330/30: Honeycomb supports characterised by their structural details
- F01N 2330/32: characterised by the shape, form or number of corrugations of plates, sheets or foils
- F01N 2330/60: Discontinuous, uneven properties of filter material, e.g. different material thickness along the longitudinal direction; Higher filter capacity upstream than downstream in same housing
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)

## Abstract

A particulate filter 23 is configured by being provided with, arranged side by side, a plurality of honeycomb-shaped segments 29, 30, 31 having a plurality of cells 32. The density of cells in the segments 30, 31 disposed in the outer circumference part is set to be lower than the density of cells in the segments 29 disposed in the center part. In addition, the segments 30, 31 disposed in the outer circumference part are configured so that the density of the cells 32 becomes lower as the area of the end face becomes smaller.

## Claims

### Claim 1

A particulate filter comprising a plurality of honeycomb-shaped segments configured to be provided in parallel, the segment including a plurality of cells,
wherein a density of cells of the segment disposed in an outer circumference part is set to be lower than a density of cells of the segment disposed in a center part, and
the segment disposed in the outer circumference part is configured to have the density of the cells thereof which is lower as an end surface of the segment disposed in the outer circumference part has smaller area.

### Claim 2 (depends on 1)

The particulate filter according to claim 1,
wherein the segment disposed in the outer circumference part is configured to have the density of the cells thereof which is lower as the segment disposed in the outer circumference part is disposed farther from a center of the particulate filter.

### Claim 3 (depends on 1)

The particulate filter according to claim 1,
wherein the segments are configured with silicon carbide.

### Claim 4

A manufacturing method for a particulate filter including a plurality of honeycomb-shaped segments configured to be provided in parallel, the segment including a plurality of cells, the method comprising the steps of:
measuring an amount of unburned residue of particulate matter in the segment disposed in an outer circumference part for each position thereof in advance; setting a density of cells of the segment disposed in the outer circumference part to be lower than a density of cells of the segment disposed in a center part;
setting the segment disposed in the outer circumference part to have the density of the cells thereof which is lower as an end surface of the segment disposed in the outer circumference part has smaller area; and
setting the density of the cells of the segment disposed in the outer circumference part to be lower as the amount of unburned residue of the particulate matter is greater.