# US 7,743,608 B2 · Exhaust gas purifying apparatus for internal combustion engine

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- Number: US 7,743,608 B2
- Document ID: US7743608B2
- Status: Granted
- Kind: B2
- Application number: 12/083,244
- Filed: 2006-03-09
- Published: 2009-10-08
- Granted: 2010-06-29
- Earliest claimed: 2005-03-09
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Inventors: Makoto Ogiso
- Web page: https://patentgrep.com/patent/US7743608B2

## CPC

- F02D 41/0082: {per groups or banks (F02D41/0087 takes precedence)}
- F01N 3/0253: {adding fuel to exhaust gases}
- F01N 3/0807: {by using absorbents or adsorbents}
- F01N 3/0821: {combined with particulate filter}
- F01N 3/0885: {Regeneration of deteriorated absorbents or adsorbents, e.g. desulfurization of NOx traps}
- F01N 9/00: Electrical control of exhaust gas treating apparatus (monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00; conjoint electrical control of two or more combustion engine functions F02D43/00)
- F01N 13/009: {having two or more separate purifying devices arranged in series}
- F01N 13/0097: {the purifying devices are arranged in a single housing}
- F01N 13/011: {having two or more purifying devices arranged in parallel}
- F02D 41/027: {to purge or regenerate the exhaust gas treating apparatus}
- F02D 41/029: {the exhaust gas treating apparatus being a particulate filter}
- F01N 13/107: {More than one exhaust manifold or exhaust collector}
- F01N 2610/03: the substance being hydrocarbons, e.g. engine fuel
- F02B 37/007: with exhaust-driven pumps arranged in parallel {, e.g. at least one pump supplying alternatively}
- F02B 75/22: with cylinders in V, fan, or star arrangement
- F02D 41/0065: {Specific aspects of external EGR control (constructional details of EGR system F02M26/00)}
- F02D 41/10: for acceleration
- F02D 41/40: with means for controlling injection timing or duration
- F02D 2200/0812: Particle filter loading
- Y02T 10/40: Engine management systems
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- 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)
- 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

An exhaust gas purifying apparatus for an internal combustion engine includes plural exhaust gas purifying units which are provided on exhaust gas passages connected to plural cylinder groups in the internal combustion engine and purify exhaust gas flowing in the exhaust gas passages, a regeneration determining unit which determines whether or not the plural exhaust gas purifying units should be regenerated, and a regeneration control unit which executes regeneration control for regenerating the exhaust gas purifying units when the regeneration determining unit determines that the exhaust gas purifying units should be regenerated. The regeneration control unit simultaneously executes the regeneration control for the plural exhaust gas purifying units when a change of a combustion mode of the internal combustion engine is involved before and after execution of the regeneration control. Meanwhile, the regeneration control unit independently executes the regeneration control for each of the plural exhaust gas purifying units when the change of the combustion mode is not involved before and after the execution of the regeneration control.

## Claims

### Claim 1

An exhaust gas purifying apparatus for an internal combustion engine comprising:
plural exhaust gas purifying units which are provided on exhaust gas passages connected to plural cylinder groups in the internal combustion engine and purify exhaust gas flowing in the exhaust gas passages;
a regeneration determining unit which determines whether or not the plural exhaust gas purifying units are to be regenerated; and
a regeneration control unit which executes regeneration control for regenerating the exhaust gas purifying units when the regeneration determining unit determines that the exhaust gas purifying units are to be regenerated,
wherein the regeneration control unit simultaneously executes the regeneration control for the plural exhaust gas purifying units in a case that a change of a combustion mode of the internal combustion engine is involved before and after execution of the regeneration control, and independently executes the regeneration control for each of the plural exhaust gas purifying units in a case that the change of the combustion mode is not involved before and after the execution of the regeneration control.

### Claim 2 (depends on 1)

The exhaust gas purifying apparatus for the internal combustion engine according to claim 1, wherein the case that the change of the combustion mode is involved is a case that at least one of an intake air amount introduced to the cylinder groups, an EGR amount fed back to an intake-air system, an fuel injection amount generating output power and a fuel injection timing is changed.

### Claim 3 (depends on 1)

The exhaust gas purifying apparatus for the internal combustion engine according to claim 1, wherein the regeneration control unit executes at least one of reduction of NOx stored by the exhaust gas purifying units, regeneration of PMs accumulating in the exhaust gas purifying units and sulfur poisoning recovery in the exhaust gas purifying units.

### Claim 4 (depends on 1)

The exhaust gas purifying apparatus for the internal combustion engine according to claim 1, wherein the regeneration control unit determines whether or not the regeneration of the PM ends for each of the plural exhaust gas purifying units, and executes the sulfur poisoning recovery when it is determined that the regeneration of the PM ends in all the exhaust gas purifying units.

### Claim 5 (depends on 3)

The exhaust gas purifying apparatus for the internal combustion engine according to claim 3, further comprising an estimation unit which estimates a PM amount accumulating in each of the plural exhaust gas purifying units,
wherein the regeneration control unit determines a control amount based on an estimated PM amount, so that time periods for executing the regeneration control for the plural exhaust gas purifying units become same.

### Claim 6 (depends on 5)

The exhaust gas purifying apparatus for the internal combustion engine according to claim 5, wherein the control amount is at least a reducing agent amount added to each of the plural exhaust gas purifying units or an exhaust gas amount supplied to each of the plural exhaust gas purifying units.