# US 10,480,369 B1 · Exhaust after-treatment system for diesel internal combustion engines

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- Number: US 10,480,369 B1
- Document ID: US10480369B1
- Status: Granted
- Kind: B1
- Application number: 16/142,634
- Filed: 2018-09-26
- Granted: 2019-11-19
- Earliest claimed: 2018-09-26
- Assignees: FEV North America, Inc.
- Applicants: FEV North America Inc.
- Inventors: Mufaddel Dahodwala; Tamas Szailer; Satyum Joshi; Erik Koehler; Michael Franke
- Web page: https://patentgrep.com/patent/US10480369B1

## CPC

- B01D 53/9477: {with catalysts positioned on separate bricks, e.g. exhaust systems}
- F01N 3/2013: {using electric or magnetic heating means}
- B01D 46/0027: {with additional separating or treating functions}
- B01D 53/9431: {Processes characterised by a specific device}
- B01D 53/944: {Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts (three-way-catalysts [TWC] B01D53/9445)}
- B01D 53/9481: {Catalyst preceded by an adsorption device without catalytic function for temporary storage of contaminants, e.g. during cold start}
- B01D 53/9495: {Controlling the catalytic process}
- F01N 3/035: with catalytic reactors
- F01N 3/0814: {combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts}
- F01N 3/0842: {Nitrogen oxides}
- F01N 3/103: {Oxidation catalysts for HC and CO only}
- F01N 3/106: {Auxiliary oxidation catalysts}
- F01N 3/2066: {Selective catalytic reduction [SCR]}
- F01N 3/208: {Control of selective catalytic reduction [SCR], e.g. by adjusting the dosing of reducing agent}
- F01N 3/28: Construction of catalytic reactors
- F01N 3/36: Arrangements for supply of additional fuel
- 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 11/00: Monitoring or diagnostic devices for exhaust-gas treatment apparatus
- F01N 13/009: {having two or more separate purifying devices arranged in series}
- B01D 53/9418: {for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas}
- B01D 53/9436: {Ammonia}
- B01D 2255/904: Multiple catalysts
- B01D 2255/91: NOx-storage component incorporated in the catalyst
- B01D 2258/012: Diesel engines and lean burn gasoline engines
- B01D 2279/30: for treatment of exhaust gases from IC Engines
- F01N 2570/14: Nitrogen oxides
- F01N 2610/02: the substance being ammonia or urea
- F01N 2610/03: the substance being hydrocarbons, e.g. engine fuel
- F01N 2900/1602: Temperature of exhaust gas apparatus
- Y02T 10/12: Improving ICE efficiencies
- Y02T 10/40: Engine management systems
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- 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

An exhaust after-treatment system is coupled to an exhaust pipe of a diesel internal combustion engine (ICE) for treating an exhaust gas. The exhaust after-treatment system includes a diesel oxidation catalyst (DOC) and a SCR coated diesel particulate filter (SDPF) serially disposed in a downstream path of the exhaust gas. An electrically heated catalyst (EHC) is coupled to the DOC and is configured to electrically heat the DOC for reducing the requisite time to reach a DOC light-off temperature. A controller is operably coupled with the DOC and the EHC and is configured to operate the EHC in response to a mid bed temperature of the DOC. More specifically, the controller is configured to supply power to the EHC when the DOC mid bed temperature is below a predetermined value and discontinue the power supply to the EHC when the DOC mid bed temperature is greater than the predetermined value.

## Claims

### Claim 1

An exhaust after-treatment system fluidically coupled to an exhaust pipe of a diesel internal combustion engine (ICE) for treating an exhaust gas, the exhaust after-treatment system comprising:
a diesel oxidation catalyst (DOC) disposed in a downstream path of the exhaust gas produced by the diesel internal combustion engine;
a selective catalytic reduction (SCR) disposed downstream of said diesel oxidation catalyst;
an electrically heated catalyst (EHC) coupled to said diesel oxidation catalyst and configured to electrically heat said diesel oxidation catalyst for reducing an amount of time to reach a DOC light-off temperature;
a controller operably coupled with said diesel oxidation catalyst and said electrically heated catalyst and configured to supply electrical power to said electrically heated catalyst in response to a mid bed temperature of said diesel oxidation catalyst being less than a predetermined DOC temperature value and discontinue the supply of electrical power to said electrically heated catalyst in response to detected the mid bed temperature of said diesel oxidation catalyst being greater than the predetermined DOC temperature value;
an SCR coated diesel particulate filter (SDPF) disposed downstream of said diesel oxidation catalyst and upstream of said selective catalytic reduction (SCR);
a fuel dosing system disposed upstream of said diesel oxidation catalyst and configured to dose the path of exhaust gas; and
said controller operably coupled to said fuel dosing system and said SDPF and configured to operate said fuel dosing system in response to detecting a mid bed temperature of said SDPF being lower than a predetermined SDPF temperature value and said discontinued supply of electrical power to said electrically heated catalyst.

### Claim 2 (depends on 1)

An exhaust after-treatment system as set forth in claim 1, wherein the predetermined DOC temperature value is 180 degrees Celsius.

### Claim 3 (depends on 2)

An exhaust after-treatment system as set forth in claim 2, further comprising an ammonia slip catalyst (ASC) disposed downstream of said selective catalytic reduction.

### Claim 4 (depends on 3)

An exhaust after-treatment system as set forth in claim 3, further comprising a reducing agent dosing system disposed upstream of said selective catalytic reduction and configured to receive and inject a reducing agent into the path of exhaust gas.

### Claim 5 (depends on 1)

An exhaust after-treatment system as set forth in claim 1, further comprising a passive NOx absorber (PNA) coupled to said diesel oxidation catalyst.

### Claim 6 (depends on 1)

An exhaust after-treatment system as set forth in claim 1, further comprising
an additional selective catalytic reduction disposed downstream of said diesel oxidation catalyst and upstream of said selective catalytic reduction;
a fuel dosing system disposed upstream of said diesel oxidation catalyst and configured to dose the path of exhaust gas; and
said controller operably coupled to said fuel dosing system and said additional selective catalytic reduction and configured to operate said fuel dosing system in response a mid bed temperature of said additional selective catalytic reduction.

### Claim 7 (depends on 6)

An exhaust after-treatment system as set forth in claim 6, further comprising
a diesel particulate filter (DPF) coupled to said diesel oxidation catalyst.