# US 11,028,744 B2 · Exhaust gas purification apparatus for internal combustion engine

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- Number: US 11,028,744 B2
- Document ID: US11028744B2
- Status: Granted
- Kind: B2
- Application number: 16/590,639
- Filed: 2019-10-02
- Published: 2020-04-16
- Granted: 2021-06-08
- Earliest claimed: 2018-10-10
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Daisuke Hayashi; Kouseki Sugiyama
- Web page: https://patentgrep.com/patent/US11028744B2

## CPC

- F01N 3/0205: {using heat exchangers}
- B01D 51/10: Conditioning the gas to be cleaned
- B01D 53/22: by diffusion (manufacturing semi-permeable membranes B01D67/00; form, structure or properties of semi-permeable membranes B01D69/00; material for semi-permeable membranes B01D71/00)
- F01N 3/00: Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust (electric control F01N9/00; monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00)
- F01N 3/021: by means of filters
- F01N 3/043: {without contact between liquid and exhaust gases}
- F01N 3/055: {without contact between air and exhaust gases}
- F01N 3/08: for rendering innocuous (using electric or electrostatic separators F01N3/01; chemical aspects B01D53/92)
- F01N 3/0857: {Carbon oxides}
- F01N 5/02: the devices using heat
- F01N 13/0093: {the purifying devices are of the same type}
- F01P 3/12: Arrangements for cooling other engine or machine parts
- F01P 3/20: Cooling circuits not specific to a single part of engine or machine (F01P3/22 takes precedence)
- F02G 5/02: Profiting from waste heat of exhaust gases
- B01D 2257/504: Carbon dioxide
- B01D 2258/01: Engine exhaust gases
- F01N 2240/02: a heat exchanger
- F01N 2510/068: characterised by the distribution of the catalytic coatings
- F01N 2570/10: Carbon or carbon oxides
- F01N 2900/00: Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N 2900/1404: Exhaust gas temperature
- F01P 7/04: by varying pump speed, e.g. by changing pump-drive gear ratio
- F01P 2007/146: {using valves}
- F01P 2025/13: Ambient temperature
- F01P 2025/30: Engine incoming fluid temperature
- F01P 2025/36: Heat exchanger mixed fluid temperature
- F01P 2025/64: Number of revolutions
- F01P 2060/16: Outlet manifold
- Y02C 20/40: of CO2
- Y02T 10/12: Improving ICE efficiencies
- 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)
- F01P: COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES (arrangements in connection with cooling of propulsion units in vehicles B60K11/00; heat-transfer, heat-exchange or heat-storage materials C09K5/00; {cooling of gas-turbine engines F02C7/12}; heat exchange in general, radiators F28)
- F02G: HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS (steam engine plants, special vapour plants, plants operating on either hot gas or combustion-product gases together with other fluid F01K; gas-turbine plants F02C; jet-propulsion plants F02K); USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

The separation efficiency of carbon dioxide is improved by making the temperature of exhaust gas further low. An exhaust gas purification apparatus for an internal combustion engine includes a first heat exchanger arranged in an exhaust passage of an internal combustion engine and configured to carry out heat exchange between outside air and exhaust gas of the internal combustion engine, a second heat exchanger arranged in the exhaust passage and configured to carry out heat exchange between a circulating heating medium and the exhaust gas, and a carbon dioxide separator arranged in the exhaust passage at the downstream side of the first heat exchanger and the second heat exchanger and configured to separate carbon dioxide from the exhaust gas.

## Claims

### Claim 1

An exhaust gas purification apparatus for an internal combustion engine comprising:
a first heat exchanger arranged in an exhaust passage of the internal combustion engine, and configured to carry out heat exchange between outside air and exhaust gas of the internal combustion engine;
a second heat exchanger arranged in the exhaust passage, and configured to carry out heat exchange between a circulating heating medium and the exhaust gas;
a carbon dioxide separator arranged in the exhaust passage at the downstream side of the first heat exchanger and the second heat exchanger, and configured to separate carbon dioxide from the exhaust gas;
a circulator configured to circulate the heating medium in the second heat exchanger; and
a controller configured to control the circulator,
wherein the second heat exchanger is arranged in the exhaust passage at the downstream side of the first heat exchanger, and
the controller does not circulate the heating medium through the second heat exchanger, in cases where a first exhaust gas temperature, which is the temperature of the exhaust gas after the exhaust gas and the outside air carry out heat exchange in the first heat exchanger, is equal to or less than a first threshold value.

### Claim 2 (depends on 1)

The exhaust gas purification apparatus for an internal combustion engine as set forth in claim 1, wherein the heating medium is cooling water of the internal combustion engine.

### Claim 3 (depends on 1)

The exhaust gas purification apparatus for an internal combustion engine as set forth in claim 1, wherein in cases where the first exhaust gas temperature is higher than the first threshold value, the controller circulates the heating medium through the second heat exchanger in cases where a second amount of decrease, which is an amount of decrease in the temperature of the exhaust gas by the second heat exchanger at the time when the heating medium circulates through the second heat exchanger, is larger than a second threshold value, whereas the controller does not circulate the heating medium through the second heat exchanger in cases where the second amount of decrease is equal to or less than the second threshold value.

### Claim 4

An exhaust gas purification apparatus for an internal combustion engine comprising:
a first heat exchanger arranged in an exhaust passage of the internal combustion engine, and configured to carry out heat exchange between outside air and exhaust gas of the internal combustion engine;
a second heat exchanger arranged in the exhaust passage, and configured to carry out heat exchange between a circulating heating medium and the exhaust gas;
a carbon dioxide separator arranged in the exhaust passage at the downstream side of the first heat exchanger and the second heat exchanger, and configured to separate carbon dioxide from the exhaust gas;
a circulator configured to circulate the heating medium in the second heat exchanger; and
a controller configured to control the circulator,
wherein the second heat exchanger is arranged in the exhaust passage at the upstream side of the first heat exchanger, and
the controller does not circulate the heating medium through the second heat exchanger, in cases where a first exhaust gas temperature, which is the temperature of the exhaust gas after the exhaust gas and the outside air carry out heat exchange in the first heat exchanger and which is the temperature of the exhaust gas at the time when the heating medium is not circulated through the second heat exchanger, is equal to or less than a first threshold value.

### Claim 5 (depends on 4)

The exhaust gas purification apparatus for an internal combustion engine as set forth in claim 4, wherein the heating medium is cooling water of the internal combustion engine.

### Claim 6

An exhaust gas purification apparatus for an internal combustion engine comprising:
a first heat exchanger arranged in an exhaust passage of the internal combustion engine, and configured to carry out heat exchange between outside air and exhaust gas of the internal combustion engine;
a second heat exchanger arranged in the exhaust passage, and configured to carry out heat exchange between a circulating heating medium and the exhaust gas;
a carbon dioxide separator arranged in the exhaust passage at the downstream side of the first heat exchanger and the second heat exchanger, and configured to separate carbon dioxide from the exhaust gas;
a circulator configured to circulate the heating medium in the second heat exchanger; and
a controller configured to control the circulator,
wherein the controller does not circulate the heating medium through the second heat exchanger, in cases where a second amount of decrease, which is an amount of decrease in the temperature of the exhaust gas by the second heat exchanger at the time when the heating medium circulates through the second heat exchanger, is equal to or less than the second threshold value.

### Claim 7 (depends on 6)

The exhaust gas purification apparatus for an internal combustion engine as set forth in claim 6, wherein the second heat exchanger is arranged in the exhaust passage at the downstream side of the first heat exchanger, and
in cases where the second amount of decrease is larger than the second threshold value, the controller circulates the heating medium through the second heat exchanger in cases where the first exhaust gas temperature, which is the temperature of the exhaust gas after the exhaust gas and the outside air carry out heat exchange in the first heat exchanger, is higher than the first threshold value, whereas the controller does not circulate the heating medium through the second heat exchanger in cases where the first exhaust gas temperature is equal to or less than the first threshold value.

### Claim 8 (depends on 6)

The exhaust gas purification apparatus for an internal combustion engine as set forth in claim 6, wherein the second heat exchanger is arranged in the exhaust passage at the upstream side of the first heat exchanger, and
in cases where the second amount of decrease is larger than the second threshold value, the controller circulates the heating medium through the second heat exchanger in cases where the first exhaust gas temperature, which is the temperature of the exhaust gas after the exhaust gas and the outside air carry out heat exchange in the first heat exchanger and which is the temperature of the exhaust gas at the time when the heating medium does not circulate through the second heat exchanger, is higher than the first threshold value, whereas the controller does not circulate the heating medium through the second heat exchanger in cases where the first exhaust gas temperature is equal to or less than the first threshold value.

### Claim 9 (depends on 6)

The exhaust gas purification apparatus for an internal combustion engine as set forth in claim 6, wherein the heating medium is cooling water of the internal combustion engine.