# US 8,539,755 B2 · Exhaust purification device of internal combustion engine

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- Number: US 8,539,755 B2
- Document ID: US8539755B2
- Status: Granted
- Kind: B2
- Application number: 13/054,684
- Filed: 2009-07-24
- Published: 2011-07-07
- Granted: 2013-09-24
- Earliest claimed: 2008-07-25
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Kotaro Hayashi; Tetsuya Yamashita
- Inventors: Kotaro Hayashi; Tetsuya Yamashita
- Web page: https://patentgrep.com/patent/US8539755B2

## CPC

- F01N 13/0093: {the purifying devices are of the same type}
- F02M 35/0216: {arranged in series, e.g. pre- and main filter in series}
- F02M 35/02441: {Materials or structure of filter elements, e.g. foams}
- F02M 35/082: {By-pass means}
- F02M 35/086: {Dust removal by flushing, blasting, pulsating or aspirating flow, washing or the like; Mechanical dust removal, e.g. by using scrapers}
- F02M 35/10255: {Arrangements of valves; Multi-way valves (F02M35/10032 takes precedence; valves in the plenum chamber F02M35/10065; check valves F02M35/10275)}
- F02M 37/36: with bypass means
- F02B 37/00: Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02M 26/06: Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
- F02M 26/10: having means to increase the pressure difference between the exhaust and intake system, e.g. venturis, variable geometry turbines, check valves using pressure pulsations or throttles in the air intake or exhaust system
- F02M 26/15: in relation to engine exhaust purifying apparatus
- F02M 26/23: Layout, e.g. schematics
- Y02T 10/12: Improving ICE efficiencies
- 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)
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Particles smaller than 50 nanometers emitted from an internal combustion engine, and serving as nuclei for forming PM (particulate matter), are removed to decrease the number of PM particles that are emitted to atmosphere. High efficiency filters are provided in passages that feed fluids into the combustion chamber, e.g., intake air, fuel and engine oil, in order to remove particles smaller than 50 nanometers serving as nuclei for forming PM.

## Claims

### Claim 1

A device for purifying exhaust gas of an internal combustion engine, comprising:
at least one high efficiency filter arranged in at least one passage for feeding at least one fluid into a combustion chamber to remove fine particles smaller than 50 nanometers that serve as nuclei for forming PM,
wherein said fine particles smaller than 50 nanometers are removed to decrease the number of PM particles emitted from the internal combustion engine;
at least one by-pass that by-passes said at least one high efficiency filter;
valve means for controlling a change-over of the flow of the fluid into said at least one high efficiency filter, the flow of the fluid into said at least one by-pass and the flow of the fluid backward through said at least one high efficiency filter; and
a control device including control logic for calculating the number of the emitted PM particles depending upon the operating conditions of the internal combustion engine to control the fluid; wherein when the calculated number of the PM particles exceeds a predetermined value, the fluid is controlled to pass through said high efficiency filter; when the calculated number of the PM particles is smaller than the predetermined value, the control device determines if PM is formed based upon the operating conditions; wherein when the PM is formed, the fluid is controlled to pass through said by-pass, and when the PM is not formed, the fluid is controlled to flow backward through said high efficiency filter to clean said high efficiency filter.

### Claim 2 (depends on 1)

The device for purifying exhaust gas of an internal combustion engine according to claim 1, wherein said operating conditions where it is calculated that the number of the PM particles exceeds the predetermined value are light-load operating conditions.

### Claim 3 (depends on 1)

The device for purifying exhaust gas of an internal combustion engine according to claim 1, wherein said at least one high efficiency filter is arranged downstream of an ordinary filter.

### Claim 4

A device for purifying exhaust gas of an internal combustion engine, comprising:
at least one high efficiency filter arranged in at least one passage for feeding at least one fluid into a combustion chamber to remove fine particles smaller than 50 nanometers that serve as nuclei for forming PM,
wherein said fine particles smaller than 50 nanometers are removed to decrease the number of PM particles emitted from the internal combustion engine;
at least one by-pass that by-passes said at least one high efficiency filter;
valve means for controlling a change-over of the flow of the fluid into said at least one high efficiency filter, the flow of the fluid into said at least one by-pass and the flow of the fluid backward through said at least one high efficiency filter; and
a control device including control logic for estimating the number of the emitted PM particles depending upon the operating conditions of the internal combustion engine to control the fluid; wherein when the estimated number of the PM particles exceeds a predetermined value, the fluid is controlled to pass through said high efficiency filter;
under the operating conditions where it is estimated that the number of the PM particles emitted from the internal combustion engine is smaller than the predetermined value, it is decided if the operating conditions are for forming the PM;
when the PM is formed, the fluid is controlled to pass through said by-pass; and
when the PM is not formed, the fluid is controlled to flow backward through said high efficiency filter to clean said high efficiency filter.

### Claim 5 (depends on 4)

The device for purifying exhaust gas of an internal combustion engine according to claim 4,
wherein said operating conditions where it is estimated that the number of the PM particles exceeds the predetermined value are light-load operating conditions.

### Claim 6 (depends on 4)

The device for purifying exhaust gas of an internal combustion engine according to claim 4, wherein said at least one high efficiency filter is arranged downstream of an ordinary filter.