# US 7,461,504 B2 · Method and system for controlling temperatures of exhaust gases emitted from internal combustion engine to facilitate regeneration of a particulate filter

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- Number: US 7,461,504 B2
- Document ID: US7461504B2
- Status: Granted
- Kind: B2
- Application number: 11/018,314
- Filed: 2004-12-21
- Published: 2006-06-22
- Granted: 2008-12-09
- Earliest claimed: 2004-12-21
- Assignees: Detroit Diesel Corporation
- Inventors: Oliver A. Warner; Admir Kreso; Michael A. Balnaves
- Web page: https://patentgrep.com/patent/US7461504B2

## CPC

- F02B 37/24: by using pumps or turbines with adjustable guide vanes
- F01N 3/023: using means for regenerating the filters, e.g. by burning trapped particles
- F01N 3/0231: {using special exhaust apparatus upstream of the filter for producing nitrogen dioxide, e.g. for continuous filter regeneration systems [CRT]}
- F01N 3/20: specially adapted for catalytic conversion (F01N3/22 takes precedence)
- F01N 11/002: {the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus}
- F02D 41/1446: {the characteristics being exhaust temperatures}
- F02B 29/0406: {Layout of the intake air cooling or coolant circuit}
- F02D 41/008: {Controlling each cylinder individually}
- F02D 41/0087: {Selective cylinder activation, i.e. partial cylinder operation (deceleration cut-off F02D41/123)}
- F02D 41/029: {the exhaust gas treating apparatus being a particulate filter}
- F02D 2041/001: {for engines with variable valve actuation}
- F02M 26/05: High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
- F02M 26/25: with coolers having bypasses
- Y02T 10/12: Improving ICE efficiencies
- Y02T 10/40: Engine management systems
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- 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)
- 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)
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Method, system, and controller for controlling exhaust gas temperatures by adjusting exhaust valve timing and/or fueling for one or more cylinders wherein normal operating cylinders receive additional fuel to compensate for the adjusted cylinders, thereby increasing exhaust gas temperatures. The method, system, and controller may be applicable in systems having an engine which emits exhaust gases having particulates which are captured by the particulate filter.

## Claims

### Claim 1

A method for controlling temperatures of exhaust gases emitted from an internal combustion engine to facilitate regeneration of particulates captured with a particulate filter, the method comprising:
controlling exhaust gas temperatures by controlling at least one cylinder of the internal combust engine according to the following four-stroke cycle:
opening and closing the intake valve to induct air during an intake stroke;
opening and closing the exhaust valve near the end of the compression stroke;
opening and closing the intake valve to induct additional air during an expansion stroke; and
delaying opening of the exhaust valve in an exhaust stroke.