# US 2016/0258331 A1 · Method of evaluating a soot quantity accumulated in a selective catalytic reduction washcoated particulate filter (sdpf)

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- Number: US 2016/0258331 A1
- Document ID: US20160258331A1
- Status: Published application
- Kind: A1
- Application number: 15/059,654
- Filed: 2016-03-03
- Published: 2016-09-08
- Earliest claimed: 2015-03-04
- Assignees: GM Global Technology Operations LLC
- Applicants: GM Global Technology Operations LLC
- Inventors: Isadora RICCI; Alessandra ACETO; Stefano PELLEGRINO; Giuseppe Mazzara BOLOGNA
- Web page: https://patentgrep.com/patent/US20160258331A1

## CPC

- F01N 3/208: {Control of selective catalytic reduction [SCR], e.g. by adjusting the dosing of reducing agent}
- F01N 3/021: by means of filters
- F01N 3/035: with catalytic reactors
- F01N 9/002: {of filter regeneration}
- F01N 2560/026: for measuring or detecting NOx
- F01N 2610/02: the substance being ammonia or urea
- F01N 2900/1402: Exhaust gas composition
- F01N 2900/1411: Exhaust gas flow rate, e.g. mass flow rate or volumetric flow rate
- F01N 2900/1602: Temperature of exhaust gas apparatus
- F01N 2900/1606: Particle filter loading or soot amount
- F01N 2900/1614: NOx amount trapped in catalyst
- F01N 2900/1812: Flow rate
- Y02T 10/12: Improving ICE efficiencies
- 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

A method is disclosed for evaluating a soot quantity accumulated in a Selective Catalytic Reduction wash-coated particulate filter of an internal combustion engine. The internal combustion engine is equipped with an exhaust gas aftertreatment system including an urea injector. Using a map correlating a urea quantity value, a NOx quantity value, a temperature value and a mass flow value to a correction value of a soot quantity is used to correct an estimated value of the soot quantity in order to obtain an evaluated value of the soot quantity.

## Claims

### Claim at position 1

1-12. (canceled)

### Claim 13

A method of evaluating a soot quantity accumulated in a Selective Catalytic Reduction wash-coated particulate filter of an internal combustion engine having an exhaust gas aftertreatment system including a urea injector, the method comprising:
determining an urea quantity value to be injected by the urea injector;
determining a NOx quantity value at an inlet of the selective catalytic reduction wash-coated particulate filter;
determining a temperature value at the inlet of the selective catalytic reduction wash-coated particulate filter;
determining a mass flow value of an exhaust gas in the aftertreatment system;
computing a correction value of a soot quantity using a map correlating the urea quantity value, the NOx quantity value, the temperature value and the mass flow value; and
correcting an estimated value of the soot quantity using the correction value in order to obtain an evaluated value of the soot quantity.

### Claim 14 (depends on 13)

The method according to claim 13, wherein subdividing the map in a first sub-map correlating the urea quantity value and the NOx quantity value to an intermediate value and a second sub-map correlating the intermediate value, the temperature value and the mass flow value to the correction value.

### Claim 15 (depends on 13)

The method according to claim 13, further comprising determining the estimated value on the basis of a pressure difference between the inlet and an outlet of the selective catalytic reduction wash-coated particulate filter.

### Claim 16 (depends on 13)

The method according to claim 13, further comprising determining the urea quantity value in an electronic control unit.

### Claim 17 (depends on 13)

The method according to claim 13, further comprising determining the NOx quantity value at the inlet of the selective catalytic reduction wash-coated particulate filter using a NOx quantity sensor located upstream of the selective catalytic reduction wash-coated particulate filter.

### Claim 18 (depends on 13)

The method according to claim 13, further comprising determining the temperature value at the inlet of the selective catalytic reduction wash-coated particulate filter using a temperature sensor located upstream of the selective catalytic reduction wash-coated particulate filter.

### Claim 19 (depends on 13)

The method according to claim 13, further comprising determining the mass flow value (EMF) using a mass flow sensor located in the exhaust gas aftertreatment system.

### Claim 20 (depends on 13)

A computer program comprising a computer-code stored in a non-transitory computer-readable media for performing the method according to claim 13.

### Claim 21 (depends on 20)

A control apparatus for an internal combustion engine, comprising an electronic control unit, a non-transitory computer-readable data carrier associated to the electronic control unit and a computer program according to claim 20 stored in the data carrier.

### Claim 22

An apparatus for evaluating a soot quantity accumulated in a selective catalytic reduction wash-coated particulate filter of an internal combustion engine having an exhaust gas aftertreatment system including a urea injector, wherein the apparatus comprises a electronic control unit for controlling the urea injector and configured to:
determine a urea quantity value to be injected by the urea injector;
determine a NOx quantity value at an inlet of the selective catalytic reduction wash-coated particulate filter;
determine a temperature value at the inlet of the selective catalytic reduction wash-coated particulate filter;
determine a mass flow value of an exhaust gas; and
determine a correction value of the soot quantity using a map correlating the urea quantity value, the NOx quantity value, the temperature value and the exhaust mass flow value,
correcting an estimated value of the soot quantity using the correction value in order to obtain an evaluated value of the soot quantity.

### Claim 23 (depends on 22)

An internal combustion engine comprising an exhaust gas aftertreatment system including a urea injector, and the electronic control unit according to claim 22 for controlling the urea injector.