# US 8,464,520 B2 · Control of diesel particulate filter regeneration duration

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- Number: US 8,464,520 B2
- Document ID: US8464520B2
- Status: Granted
- Kind: B2
- Application number: 12/579,627
- Filed: 2009-10-15
- Published: 2011-03-03
- Granted: 2013-06-18
- Earliest claimed: 2009-08-28
- Assignees: Ford Global Technologies, LLC
- Applicants: Kevin Chen; Christopher Oberski; Norman Hiam Opolsky; Peter Mitchell Lyon
- Inventors: Kevin Chen; Christopher Oberski; Norman Hiam Opolsky; Peter Mitchell Lyon
- Web page: https://patentgrep.com/patent/US8464520B2

## CPC

- F01N 3/021: by means of filters
- F01N 3/023: using means for regenerating the filters, e.g. by burning trapped particles
- F01N 9/002: {of filter regeneration}
- F01N 2900/1602: Temperature of exhaust gas apparatus
- F01N 2900/1606: Particle filter loading or soot amount
- F01N 2900/1631: Heat amount provided to exhaust apparatus
- 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)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Termination of regeneration of a particulate filter may be based on a variable percent threshold of stored particulate, where the percent threshold of stored particulate depends on a current soot burn rate. In one example approach, a method for controlling regeneration of a diesel particulate filter comprises: terminating regeneration based on a particulate burning rate; wherein the particulate burning rate is based on operating conditions of the diesel particulate filter; the operating conditions including an amount of stored particulate in the diesel particulate filter and a temperature of the diesel particulate filter.

## Claims

### Claim 1

A method for controlling regeneration of a diesel particulate filter in an engine exhaust, comprising:
during first conditions at a first particulate storage level, burning soot at a higher rate, and terminating the regeneration at a lower soot storage level; and
during second conditions at the first particulate storage level, burning soot at a lower rate, lower than the higher rate, and terminating the regeneration at a higher soot storage level.

### Claim 2 (depends on 1)

The method of claim 1, further comprising terminating regeneration based on a vehicle speed.

### Claim 3 (depends on 1)

The method of claim 1, wherein a particulate burning rate is determined based on operating conditions of the diesel particulate filter.

### Claim 4 (depends on 3)

The method of claim 3, wherein the operating conditions include an amount of stored particulate in the diesel particulate filter and a temperature of the diesel particulate filter.

### Claim 5

A system for a vehicle, comprising:
a particulate filter coupled in an exhaust of the vehicle, and
a non-transitory computer readable storage medium having instructions encoded thereon for controlling regeneration of the particulate filter, including:
instructions to initiate particulate filter regeneration in response to vehicle operating conditions and an amount of stored particulate, and
instructions to terminate the particulate filter regeneration in response to the amount of stored particulate falling below a threshold percentage of stored particulate, the threshold percentage of stored particulate based on a particulate burning rate.

### Claim 6 (depends on 5)

The system of claim 5, wherein the instructions include determining the particulate burning rate based on an amount of stored particulate and a catalyst temperature.

### Claim 7 (depends on 5)

The system of claim 5, wherein the threshold percentage of stored particulate is further based on a level of aging of the particulate filter.

### Claim 8 (depends on 5)

The system of claim 5, wherein the instructions include adjusting a post injection to terminate regeneration.

### Claim 9 (depends on 5)

The system of claim 5, wherein the termination of particulate filter regeneration is further based on a vehicle speed.