# US 10,865,675 B2 · Particulate matter (PM) sensor for detecting quantity of PM in exhaust gas from e.g. diesel engine

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- Number: US 10,865,675 B2
- Document ID: US10865675B2
- Status: Granted
- Kind: B2
- Application number: 16/093,666
- Filed: 2017-04-11
- Published: 2019-05-02
- Granted: 2020-12-15
- Earliest claimed: 2016-04-14
- Assignees: Isuzu Motors Limited
- Applicants: Isuzu Motors Limited
- Inventors: Takayuki Furukawa; Kenji Fujii; Tadashi Uchiyama; Kazuo Ohsumi; Keisuke Nakamura
- Web page: https://patentgrep.com/patent/US10865675B2

## CPC

- F01N 3/022: characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
- F01N 3/00: Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust (electric control F01N9/00; monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00)
- F01N 3/0222: {the structure being monolithic, e.g. honeycombs}
- F01N 3/023: using means for regenerating the filters, e.g. by burning trapped particles
- F01N 9/002: {of filter regeneration}
- G01N 15/0606: {by collecting particles on a support}
- G01N 15/0656: {using electric, e.g. electrostatic methods or magnetic methods (by investigating individual particles G01N15/1031, G01N15/12)}
- G01N 27/22: by investigating capacitance
- F01N 2560/05: the means being a particulate sensor
- G01N 2015/0046: {in gas, e.g. smoke}
- Y02T 10/40: Engine management systems
- 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)
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

This particulate matter (PM) sensor is provided with a porous body that has a partition disposed in a passage for exhaust gas including particulate matter, at least a pair of electrodes that oppose each other in a prescribed direction so as to sandwich the porous body, and a deposition part that includes the surface of the partition on the upstream side of the passage, has the particulate matter deposited thereon, and has, formed therein, pores having an average pore diameter smaller than the average pore diameter of the portion of the partition other than the deposition part.

## Claims

### Claim 1

A particulate matter (PM) sensor, comprising:
a porous member including a partition wall disposed in a passage of an exhaust gas containing particulate matter;
at least a pair of electrodes opposed to each other in a predetermined direction across the porous member; and
an accumulation section provided in a surface on a upstream side of the passage of the partition wall, so that particulate matter accumulates on the surface, the accumulation section including pores with an average pore diameter smaller than an average pore diameter of a portion other than the accumulation section in the partition wall.

### Claim 2 (depends on 1)

The PM sensor of claim 1, wherein
a porosity of the accumulation section is higher in the partition wall than that of a portion other than the accumulation section.

### Claim 3 (depends on 1)

The PM sensor of claim 1, wherein:
the surface is parallel to the predetermined direction,
the partition wall partitions a space between the pair of electrodes into a first cavity and a second cavity aligned in a direction orthogonal to the predetermined direction,
an end of the first cavity located downstream forms an opening, and an end of the first cavity located upstream is closed, and
an end of the second cavity located downstream is closed, and an end of the second cavity located upstream forms an opening.