# US 10,309,284 B2 · Method of regenerating an exhaust gas purification filter, and vaporizer

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- Number: US 10,309,284 B2
- Document ID: US10309284B2
- Status: Granted
- Kind: B2
- Application number: 12/993,256
- Filed: 2009-04-30
- Published: 2011-05-26
- Granted: 2019-06-04
- Earliest claimed: 2008-05-21
- Assignees: Faurecia Emissions Control Technologies, Germany GmbH
- Applicants: Wilbur Crawley; Tobias Danner; Wolfgang Hahnl; Jurgen Klement; Marco Ranalli; Barbara Lacher
- Inventors: Wilbur Crawley; Tobias Danner; Wolfgang Hahnl; Jurgen Klement; Marco Ranalli; Barbara Lacher
- Web page: https://patentgrep.com/patent/US10309284B2

## CPC

- 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)
- B01D 53/944: {Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts (three-way-catalysts [TWC] B01D53/9445)}
- B01D 53/96: Regeneration, reactivation or recycling of reactants
- F01N 3/0253: {adding fuel to exhaust gases}
- F01N 3/36: Arrangements for supply of additional fuel
- B01D 2251/21: Organic compounds not provided for in groups B01D2251/206 or B01D2251/208
- B01D 2258/012: Diesel engines and lean burn gasoline engines
- B01D 2258/014: Stoichiometric gasoline engines
- F01N 2240/16: an electric heater, i.e. a resistance heater
- F01N 2610/03: the substance being hydrocarbons, e.g. engine fuel
- F01N 2610/10: the substance being heated, e.g. by heating tank or supply line of the added substance
- F01N 2610/107: using glow plug heating elements
- 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)
- 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)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A method of regenerating an exhaust gas purification filter, in particular for internal combustion engines, uses a vaporized liquid that is to be introduced into the exhaust gas flow. A surface temperature of a heating element in a vaporizer chamber is limited to a maximum of 700 to 750° C.

## Claims

### Claim 1

A method of regenerating an exhaust gas purification filter of an internal combustion engine using a vaporized liquid to be introduced into an exhaust gas flow, comprising by the steps of:
providing at least one heating element positioned in a vaporizer chamber, wherein the at least one heating element includes at least one heating coil;
feeding a liquid into the vaporizer chamber;
heating up and vaporizing the liquid with the at least one heating element;
controlling a surface temperature of the at least one heating element, in an operating condition, within a range of 700° C. to 750° C.;
supplying energy to the at least one heating element as a function of an amount of liquid present in the vaporizer chamber and/or of liquid mass flow delivered through the vaporizer chamber; and
heating up and vaporizing the liquid without igniting the liquid.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the liquid is fuel.

### Claim 3

The method according to 1, wherein the at least one heating element is a glow plug that is within the vaporizer chamber, and wherein the vaporizer chamber is downstream from the internal combustion engine and upstream of the exhaust gas purification filter.

### Claim 4 (depends on 1)

The method according to claim 1, including controlling an amount of energy supplied to the at least one heating element with pulse width modulation.

### Claim 5 (depends on 1)

The method according to claim 1, including switching the liquid mass flow introduced into the vaporizer chamber between preset fixed values.

### Claim 6 (depends on 1)

The method according to claim 1, including dividing the vaporizer chamber into a liquid section and a vapor section, and configuring the at least one heating element to have an outer surface that makes more energy available in the liquid section than in the vapor section.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the at least one heating element includes a control coil connected upstream of the heating coil.

### Claim 8 (depends on 7)

The method according to claim 7, wherein the control coil changes resistance at a specific temperature.

### Claim 9 (depends on 7)

The method according to claim 7, including connecting an electronic controller to the control coil with at least one electrical connection such that the electronic controller controls the control coil to vary resistance in relation to the temperature.

### Claim 10 (depends on 7)

The method according to claim 7, wherein the heating element further comprises a second heating coil downstream of the control coil, and wherein the control coil is configured to have different resistances as a function of temperature.

### Claim 11 (depends on 1)

The method according to claim 1, wherein the at least one electrical heating element includes a plurality of heating wires which are adapted to be driven differently for controlling the surface temperature.

### Claim 12

A method of regenerating an exhaust gas purification filter of an internal combustion engine using a vaporized liquid to be introduced into an exhaust gas flow, comprising by the steps of:
providing at least one electric heating element positioned in a vaporizer chamber, wherein the at least one electric heating element includes at least one heating coil;
feeding a liquid into the vaporizer chamber;
heating up and vaporizing the liquid with the at least one electric heating element;
controlling a surface temperature of the at least one electric heating element, in an operating condition, within a range of 700° C. to 750° C.,
controlling the at least one electric heating element based on an amount of liquid supplied to the vaporizer chamber by a pump; and
heating up and vaporizing the liquid without igniting the liquid.

### Claim 13

A vaporizer of a vehicle exhaust gas purification device comprising:
a vaporizer chamber that receives a liquid;
at least one electrical heating element positioned in the vaporizer chamber to heat the liquid;
a controller configured to control surface temperature of the at least one electrical heating element within a range of 700° C. to 750° C.;
the controller configured to supply energy to the at least one heating element as a function of an amount of liquid present in the vaporizer chamber and/or of liquid mass flow delivered through the vaporizer chamber; and
the controller configured to heat up and vaporize the liquid without igniting the liquid.

### Claim 14 (depends on 13)

The vaporizer according to claim 13, wherein the controller comprises an electronic controller which includes at least one electrical connection to the at least one electrical heating element.

### Claim 15 (depends on 13)

The vaporizer according to claim 13, wherein the at least one electrical heating element includes at least one heating coil and a control coil connected upstream of the heating coil.

### Claim 16 (depends on 15)

The vaporizer according to claim 15, wherein the control coil is configured to have different resistances as a function of temperature.

### Claim 17 (depends on 13)

The vaporizer according to claim 13, wherein the vaporizer chamber is subdivided into a liquid section and a vapor section, and wherein the at least one electrical heating element has an outer surface that makes more energy available in the liquid section than in the vapor section.

### Claim 18 (depends on 13)

The vaporizer according to claim 13, wherein the at least one electrical heating element includes a plurality of heating wires which are adapted to be driven differently for controlling the surface temperature.

### Claim 19 (depends on 13)

The vaporizer according to claim 13, wherein the at least one electrical heating element is a glow plug that is within the vaporizer chamber, and wherein the vaporizer chamber is downstream from an internal combustion engine and upstream of the vehicle exhaust gas purification device.