# US 9,003,777 B2 · Methods and systems for an exhaust gas treatment system

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- Number: US 9,003,777 B2
- Document ID: US9003777B2
- Status: Granted
- Kind: B2
- Application number: 13/759,919
- Filed: 2013-02-05
- Published: 2014-08-07
- Granted: 2015-04-14
- Earliest claimed: 2013-02-05
- Assignees: Ford Global Technologies, LLC
- Applicants: Ford Global Technologies, LLC
- Inventors: Shikui Kevin Chen; Kirk Andrew Parrish; Joseph Goode; Jeffrey Malcolm Travis; Norman Hiam Opolsky
- Web page: https://patentgrep.com/patent/US9003777B2

## CPC

- F01N 9/002: {of filter regeneration}
- F02D 41/3005: {Details not otherwise provided for}
- F01N 3/106: {Auxiliary oxidation catalysts}
- F01N 3/2066: {Selective catalytic reduction [SCR]}
- F01N 2430/08: by modifying ignition or injection timing
- F01N 2550/04: Filtering activity of particulate filters
- F01N 2560/025: for measuring or detecting O2, e.g. lambda sensors
- F01N 2560/05: the means being a particulate sensor
- F01N 2560/08: the means being a pressure sensor
- F01N 2570/12: Hydrocarbons
- F01N 2900/0416: using the state of a sensor, e.g. of an exhaust gas sensor
- F01N 2900/1606: Particle filter loading or soot amount
- F02B 37/00: Engines characterised by provision of pumps driven at least for part of the time by exhaust
- 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)
- 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)
- 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

Various systems and methods are described for an engine system with an exhaust gas treatment system including a particulate filter. In one example method, accumulated hydrocarbons are removed from the exhaust gas treatment system by increasing an exhaust gas temperature to a first temperature responsive to a particulate filter regeneration request during extended cold idle operation. After a predetermined duration, the exhaust gas temperature is increased to a second, higher temperature to regenerate the particulate filter.

## Claims

### Claim 1

A method, comprising:
in response to extended cold idle operation, and in response to a particulate filter regeneration request, first removing hydrocarbons stored in a particulate filter, and then performing particulate filter regeneration, wherein increasing a temperature of exhaust gas includes increasing engine speed, retarding fuel injection timing, and increasing a number of fuel injection events.

### Claim 2 (depends on 1)

The method of claim 1, wherein removing the hydrocarbons includes increasing a temperature of exhaust gas to a first temperature, but below a second temperature, for a predetermined duration.

### Claim 3 (depends on 2)

The method of claim 2, wherein the first temperature is between 250 and 350° C.

### Claim 4 (depends on 2)

The method of claim 2, wherein the predetermined duration is based on a duration of the idle operation and an exhaust gas temperature during the idle operation.

### Claim 5 (depends on 1)

The method of claim 1, further comprising, in response to a manual particulate filter regeneration request not received during extended cold idle operation, performing the particulate filter regeneration without removing the hydrocarbons stored in the particulate filter.

### Claim 6 (depends on 1)

The method of claim 1, further comprising estimating an amount of the hydrocarbons stored in the particulate filter based on a duration of the idle operation and an exhaust gas temperature during the idle operation.

### Claim 7 (depends on 1)

The method of claim 1, wherein extended cold idle operation includes operating an engine at a speed below a threshold speed with an exhaust gas temperature less than a threshold temperature for a duration greater than a threshold duration.

### Claim 8

A method, comprising:
responsive to a manual request for particulate filter regeneration, when an amount of hydrocarbons stored in a particulate filter positioned in an exhaust system of an engine exceeds a threshold amount and the engine is under extended cold idle conditions, increasing an exhaust gas temperature to a first temperature, but below a second temperature; and
after a predetermined duration at the first temperature, increasing the exhaust gas temperature to the second temperature to initiate regeneration of the particulate filter.

### Claim 9 (depends on 8)

The method of claim 8, wherein the threshold amount of hydrocarbons is based on a duration of the idle conditions and an exhaust gas temperature during the extended cold idle conditions.

### Claim 10 (depends on 8)

The method of claim 8, wherein the predetermined duration is based on the amount of hydrocarbons stored in the particulate filter.

### Claim 11 (depends on 8)

The method of claim 8, further comprising, responsive to a manual request for particulate filter regeneration when the engine is not under extended cold idle conditions, increasing the exhaust gas temperature to the second temperature to initiate regeneration of the particulate filter without keeping the exhaust gas temperature at the first temperature for the predetermined duration.

### Claim 12 (depends on 8)

The method of claim 8, wherein increasing the exhaust gas temperature to the first temperature includes increasing engine speed.

### Claim 13 (depends on 8)

The method of claim 8, wherein increasing the exhaust gas temperature to the second temperature includes increasing engine speed and retarding fuel injection timing.

### Claim 14 (depends on 8)

The method of claim 8, wherein the threshold amount of hydrocarbons corresponds to a loading of the particulate filter.

### Claim 15 (depends on 8)

The method of claim 8, wherein the first temperature is between 250 and 350° C., and the second temperature is 600° C.

### Claim 16

A system, comprising:
an engine with an exhaust passage;
an exhaust treatment system disposed in the exhaust passage including at least a particulate filter; and
a controller including non-transitory instructions to increase a temperature of exhaust gas from the engine to a first temperature when an amount of hydrocarbons exceeds a threshold amount and the engine is under extended cold idle conditions; to increase the temperature of the exhaust gas to a second, higher temperature after a predetermined first duration; and to increase the temperature of the exhaust gas to the second temperature responsive to a regeneration request when the engine is not under extended cold idle conditions.

### Claim 17 (depends on 16)

The system of claim 16, wherein the threshold amount of hydrocarbons corresponds to a loading of the particulate filter.

### Claim 18 (depends on 16)

The system of claim 16, further comprising instructions to retard fuel injection timing to increase the temperature of the exhaust gas to the first temperature.

### Claim 19 (depends on 16)

The system of claim 16, further comprising instructions to increase engine speed and retard fuel injection timing to increase the temperature of the exhaust gas to the second temperature.