CN117677763A - EGR system for preheating emission control devices - Google Patents
EGR system for preheating emission control devices Download PDFInfo
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- CN117677763A CN117677763A CN202180092765.0A CN202180092765A CN117677763A CN 117677763 A CN117677763 A CN 117677763A CN 202180092765 A CN202180092765 A CN 202180092765A CN 117677763 A CN117677763 A CN 117677763A
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- heating
- emission control
- control element
- air
- heating device
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- 238000010438 heat treatment Methods 0.000 claims abstract description 119
- 239000007789 gas Substances 0.000 claims description 50
- 238000002485 combustion reaction Methods 0.000 claims description 39
- 238000011144 upstream manufacturing Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 11
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 239000003054 catalyst Substances 0.000 description 14
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000010411 electrocatalyst Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
- F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/02—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a heat exchanger
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/16—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an electric heater, i.e. a resistance heater
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
An arrangement (10) for heating an exhaust control element (17) of an exhaust gas from a hot engine of a motor vehicle is disclosed, which arrangement comprises an exhaust line (20) passing through the exhaust control element, characterized in that the arrangement (10) comprises a closed loop (10 b) for heating air penetrating the exhaust control element (17).
Description
Technical Field
The present invention relates to an internal combustion engine equipped with an exhaust gas emission control system.
More particularly, the present invention relates to a heating device for heating an emission control system of an internal combustion engine associated with an electric motor.
Background
In order to reduce the emission of pollutants into the atmosphere, motor vehicles have hybrid engines. Thus, the vehicle comprises an internal combustion engine or a thermal engine associated with an electric motor with a battery.
As is well known, electric motors are typically used in the run phase after the vehicle is started. The thermal engine is then started according to the charge level in the battery of the electric motor.
The thermal engine is equipped with an emission control system. For all types of motor vehicles with internal combustion engines, the emission control system varies according to the type of engine, but in all cases the emission control system comprises at least one emission control element.
For gasoline or "controlled ignition" vehicles, emission control is typically performed by a catalyst known as a three-way catalyst. Such vehicles may also be provided with a particulate filter specifically designed for gasoline fuel, such catalysts being abbreviated as GPF (standing for gasoline particulate filter).
To be effective, these catalysts must be at least at a certain threshold temperature, which is referred to as the minimum operating temperature of the catalyst. This is because when one or more catalysts are not fully functional, a substantial portion of the emissions of a particular pollutant from the motor vehicle is released before the catalyst dedicated to emission control of the particular pollutant reaches the minimum operating temperature.
The temperature threshold actually varies depending on the type of catalyst. The temperature rise of the emission control system may be caused by exhaust gas or by external equipment (e.g., an additional electric heater). Thus, exhaust lines today use either electrically heated or non-electrically heated catalysts.
Currently, strategies are known for heating an emission control element containing a catalyst based on a fixed heating time. For example, according to the verification test, at the end of this heating time, the catalyst has reached its minimum operating temperature.
One disadvantage is the electrical consumption of the electrocatalyst heating system, which may affect battery charging and significantly reduce electrically driven range.
Publication FR 2981983-A1 proposes recirculation of combustion exhaust gases which are drawn off downstream of an emission control element in order to be brought back upstream of said emission control element, so as to promote an increase in the temperature of the gases upstream of the emission control element.
This proposal makes it possible to accelerate the rise in temperature of the combustion exhaust gases upstream of the emission control element, but with lower efficiency during the engine start phase, because the temperature of the gases is not sufficiently high and the emissions remain significantly high during the engine start phase.
The object of the present invention is to overcome these problems, and the subject of the present invention is a heating device for heating an emission control element prior to a hot engine start, which heating device is economical in terms of electrical energy consumption, and an associated operating method.
Disclosure of Invention
More particularly, the invention relates to a heating device for heating a combustion exhaust emission control element of a hot engine of a hybrid motor vehicle, said hot engine being associated with an electric motor and comprising an exhaust gas line passing through at least one emission control element and comprising a duct for conveying hot air, characterized in that the device comprises an air heating closed loop passing through the emission control element.
Advantageously, the device comprises an air heating and circulating closed loop through the emission control element, said loop having a small volume, the temperature of which can be rapidly increased.
According to a further feature of the present invention:
the closed loop comprises a heating element independent of the operation of the engine.
Advantageously, the heating element of the air heating closed loop is independent of the operation of the engine and can therefore be started when the engine is stopped.
The heating element is electrically driven, in particular an electrical heating grid.
Advantageously, the heating element is electrically driven and generates limited pressure losses. An electrical heating grid is a suitable way to heat the air to promote a temperature rise without significant pressure loss.
The air heating circuit comprises a conduit connected to the exhaust line downstream and upstream of the emission control element.
Advantageously, the heating loop has a relatively short length and comprises a conduit having an upstream end and a downstream end, both of which are connected to the exhaust line downstream and upstream of the emission control element, respectively.
The air heating loop comprises elements for forced air circulation with low flow rate.
Advantageously, the air heating loop comprises a forced air circulation element to assist in the circulation of air heated by the heating element. The forced circulation flow rate is low and allows homogenizing the heating of the air and the temperature rise of the air.
The heating loop comprises an air circulation control valve arranged upstream of the heating element in the direction of air circulation.
Advantageously, the heating loop comprises an air circulation control valve adapted to allow/block the circulation of air in said heating loop towards the emission control element. Thus, the circulation of hot air for promoting the temperature rise of the emission control element can be easily controlled, in particular by a temperature sensor upstream or downstream of the emission control element.
The heating loop forms part of a combustion exhaust gas recirculation loop.
Advantageously, the hot engine comprises a low-pressure combustion exhaust gas recirculation circuit, called EGR circuit, having a common part with the heating circuit, in particular upstream of an EGR valve capable of controlling the return of EGR combustion gases to the engine intake. The EGR valve and heating loop control valve allow air (particularly after the air has passed through the heating element) to be distributed to the emission control element or to the engine intake. The two valves act such that at most one of the two passages is provided at a time by the two valves.
The invention also relates to a low pressure combustion exhaust gas recirculation circuit comprising a heating loop for heating an emission control element.
The invention also relates to a method for managing heating of air in order to raise the temperature of an emission control element, the method comprising:
verifying a condition indicating that the emission control element needs to be heated,
a step of heating the air in the closed loop so as to cause an increase in temperature of the emission control element,
-a step of stopping heating the emission control element in case the start of the hot engine is authorized.
Advantageously, the heating device operates according to a method for managing said heating, comprising the following successive steps:
a first step of verifying conditions indicative of the need for heating, for example with an estimation of the temperature of the emission control element,
a second step of heating the emission control element by passing air through a closed heating loop. The heating step may be performed for a period of time before the condition indicating that heating is required is re-verified. This step involves opening the access control valve, operating the heating element, operating the forced air circulation element, and possibly closing the EGR valve.
-a step of stopping heating of the emission control element, the step comprising:
* The control valve is closed and the valve is opened,
* The operation of the heating element is stopped and,
* A signal is sent to authorize the start of the hot engine,
* Depending on the management of the intake of the hot engine, a signal is sent to authorize the possibility of opening the EGR valve.
According to further features of the method:
forced circulation of air can be managed by opening the EGR valve.
Advantageously, the forced circulation of air or combustion exhaust gases may be triggered during operation of the hot engine, in particular with the opening of the EGR valve, to promote recirculation of low pressure EGR gas towards the intake of the hot engine.
Drawings
Further features and advantages of the invention will become apparent from reading the following description of a specific embodiment of the invention, provided by way of non-limiting example and depicted in the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a heating device for heating an emission control element of a thermal engine.
FIG. 2 is a schematic diagram of a method for managing a heating device for heating an emission control element of a thermal engine.
Detailed Description
In the following description, the same reference numerals denote the same components or components having similar functions.
In the description and in the claims, the expressions "upstream" and "downstream" determined by the emission control device and the direction of flow of the exhaust gas in the exhaust line of the EGR ("exhaust gas recirculation") or recirculating combustion exhaust gas recirculation circuit will be used with reference to the arrows in fig. 1, without this implying any limitation.
The present invention relates to a motor vehicle having a hybrid engine comprising an electric motor and a thermal engine.
To enhance the performance of an internal combustion engine or a thermal engine, the thermal engine (not shown) includes an intake compressor stage 22, which may be associated with a turbine stage 23 capable of at least partially recovering kinetic energy of combustion exhaust gases exiting the engine combustion chamber. These two stages form a turbocharger 21 as shown in fig. 1.
To reduce the amount of pollutants produced, the hot engine includes a combustion exhaust gas recirculation loop 20r. According to the invention, the combustion exhaust gases in the embodiment shown are low-pressure combustion exhaust gases, that is to say they are taken from an exhaust line downstream of an emission control element, such as a "selective catalytic reduction" (SCR) catalyst 17 designed for removing nitrogen oxides, or a particulate filter for removing soot particles, or an oxidation catalyst, also known as DOC, for removing carbon monoxide (CO) and unburned hydrocarbons, which stands for "diesel oxidation catalyst". The combustion exhaust gases are then returned to the engine air intake for mixing with fresh air captured from the front end of the vehicle.
In a known manner, the emission control elements 17 need to be at a minimum temperature in order to be fully effective and to perform the function of these emission control elements to control emissions in the combustion exhaust gases. It is known to inject fuel to increase the temperature of the gas entering the emission control element in the event of a hot engine start.
In this case, the combustion exhaust gases are returned to the upstream 27 of the compression stage 22.
When the vehicle starts, an electric motor (not shown) is used to travel several kilometers or even tens of kilometers, depending on the power of a battery associated with the electric motor, in a known manner.
The aim of the invention is to use the electric motor to prepare the thermal engine for taking over when necessary, in particular to prepare the emission control element 17 for the optimum operating temperature conditions when the vehicle is driving.
According to one embodiment of the invention, the thermal engine comprises a heating device 10 for heating the emission control element, which heating device is capable of operating with the thermal engine stopped or without combustion occurring during the use phase of the electric motor.
The air heating means comprises a closed loop 10b comprising a gas or air circulation duct 11a,11b, the upstream end of which is connected to the downstream end 17b or outlet end of the emission control element 17 and the opposite downstream end of which is connected to the upstream end 17a or inlet end of the emission control element.
According to fig. 1, the upstream end of the circulation line is present in the exhaust line 20 of the exhaust line of the engine, for example upstream of the catalytic converter 30. The catalytic converter 30 forms an obstacle to the circulation of air, which may result in considerable pressure loss. The heated air is thus preferably circulated in the circulation duct 11 a.
Also, the downstream end of the circulation duct 11b is present in the exhaust duct 20 downstream of the turbine stage 23 of the turbocharger 21, which forms an obstacle to the circulation of the air thus directed towards the emission control element 17, which may lead to considerable pressure losses.
As a result, a short length of air circulation closed loop 10b is readily obtained, which loop passes through the emission control element 17 and connects the outlet 17b to the inlet 17a of said emission control element.
Preferably, the first temperature sensor 16' is placed at the inlet 17a of the emission control element and the second temperature sensor 16 "is placed downstream of said element or at the outlet 17 b. These two sensors are able to measure the temperature of the air or gas at the inlet and outlet of the emission control element in order to estimate the temperature of said element 17.
Note that the present invention is not limited to estimating the temperature of the emission control element using two temperature sensors 16', 16″ as described above. For example, a dedicated temperature sensor may also be placed inside the emission control element 17.
The heating device 10 according to one embodiment of the present invention comprises a short length closed loop 10b for circulating air between the outlet 17b and the inlet 17a of the emission control element 17, and a circulating air heating element 15.
Air is circulated in the loop by means of an element 12, which may be a fan, for forced circulation of air at a low flow rate. A low flow rate of about 6 liters per second helps to raise the temperature of the circulated air and homogenize the temperature of the heated air.
The heating device 10 comprises a heating element 15 independent of the operation of the thermal engine. The heating element 15 is preferably electrically driven, for example an electrical heating grid. An advantage of this type of heating element is that, on the one hand, it is easy to position the heating element in the circulation duct 11b and, on the other hand, it produces a small pressure loss in the air passing through it.
The air heating device 10 comprises a control valve 14 for controlling the circulation of air in the circulation pipes 11a,11 b. The valve 14 can close the pipes 11a,11b or can allow air to pass in the closed loop 10 b. The valve 14 is preferably arranged upstream of the heating element 15, in particular when the closed loop forms part of a low-pressure EGR combustion exhaust gas recirculation circuit 20r.
According to one embodiment, the low pressure EGR combustion exhaust gas recirculation loop 20r includes a heating device 10 for heating an emission control element having a closed loop 10 b.
In this case, the low-pressure EGR combustion exhaust gas recirculation circuit 20r is connected to the exhaust line 20 downstream of the emission control element 17. The exhaust line comprises a passage conduit 20p for passing through gas present in the conduit of the exhaust line 20 downstream of the emission control element. The passage conduit 20p then passes through an air/water type heat exchanger 25 in which the air or combustion exhaust gas exchanges a certain amount of heat with the cooling water. The passage conduit is controlled to open/close by a valve called EGR valve 24 and extends through conduit 20a for delivering recirculated gas to the intake of engine 27, in this case to gas compression stage 22.
Advantageously, a passage conduit 20p for the passage of gas from the point where it occurs in the conduit of the exhaust line 20 downstream of the emission control element 17 to the EGR valve 24 is shared with the air heating circulation conduit 11 a.
Preferably, the passage duct 20p includes an impurity filter 13 arranged close to a point where the passage duct appears in the exhaust duct 20.
Preferably, the passage duct 20p passes through an air/water heat exchanger 25 for cooling the EGR combustion exhaust gas. Thus, during the heating phase of the emission control element 17, the hot air may also release heat to the water in the exchanger of the engine cooling circuit and allow the temperature of said liquid to rise, thereby also causing the temperature of the engine element to rise, thereby providing a more favourable condition for starting the engine.
Thus, the downstream end 20Y of the gas passage conduit includes a Y-connector having two branches: a first branch 11b called a heating branch, which is connected to the exhaust line 20 of the upstream 17a of the emission control element, and whose opening/closing is controlled by the control valve 14; and a second branch 20a connected to the air intake line, and opening/closing of which is controlled by an EGR valve 24. Each of the two valves 14, 24 can be opened only when the other valve is in the closed position.
Thus, the control valve 14 and the EGR valve 24 are adapted to define the function of the passage ducts 11a, 20p alternating between the air heating duct 11a and the EGR combustion exhaust gas recirculation duct 20 p.
The operation of the heating device is described below in connection with integration in an EGR combustion exhaust gas recirculation loop.
The operation follows a method 100 comprising the following successive steps:
the first step, i.e. the check 110, indicates the conditions that require heating.
These conditions include:
* It is checked whether the hot engine is stopped 111,
* It is checked whether the electric motor is started and/or running 112,
* The temperature of the emission control element is estimated 113 to be below a minimum temperature threshold, which may be about 400 ℃.
These three conditions must be met to verify the start of the emission control element heating.
-a second heating step 120 comprising the actions of:
* The EGR valve 24 is closed/blocked 121,
* The air passage control valve 14 is opened 122,
* The air heating element 15 is ignited 123,
* The forced air circulation is started 124.
A step 130 of confirming the end of heating.
The heating step 120 ends, for example, in the following case:
* The emission control element reaches a minimum temperature threshold of 131, or
* The hot engine is started 132.
Any of these conditions may terminate the heating step 120.
A third step 140 of stopping heating, the third step comprising the actions of:
* The heating 141 of the heating element 15 is stopped,
* The heating branch 11b is closed or blocked 142 by the control valve 14,
* The grant 143 opens the EGR valve.
The opening/closing of the EGR valve may be defined in the method 110, particularly in the case of hot engine operation, for recirculation of EGR recirculated combustion exhaust gas or for managing an EGR combustion exhaust gas recirculation loop comprising the air heating device 10.
Operation of the forced air circulation element may also be governed by the method 110, particularly in the case of hot engine operation, for recirculation of EGR-recirculated combustion exhaust gas to improve EGR-combusted exhaust gas recirculation. In particular, the forced circulation element may improve recirculation of the recirculated gas towards the engine intake. The opening of the EGR valve preferably triggers the forced circulation of the gas by means of a forced circulation element.
The aim is achieved by:
the heating means for heating the emission control element allows the temperature of the emission control element to rise quite rapidly with limited electrical energy consumption and allows the thermal engine to start under better temperature conditions.
It goes without saying that the invention is not limited to the embodiments disclosed herein above by way of example only, but that the invention includes all variants of these embodiments.
According to another embodiment, the Y-connector at the downstream end of the gas passage conduit may be controlled by a multi-way valve.
The heating device for heating the emission control element may also be placed in a vehicle having only a hot engine or in a non-hybrid vehicle. In this case, the start-up of the hot engine includes a preliminary heating phase to bring the emission control element to an optimal operating temperature. The hot engine will then be able to be ignited. The heating time will depend on the available electrical power. Under extreme temperature conditions, the heating time may be about several tens of seconds at ambient temperature of-20 ℃.
Claims (10)
1. Heating device (10) for heating a combustion exhaust emission control element (17) of a thermal engine of a motor vehicle, comprising an exhaust gas line (20) passing through the emission control element, characterized in that the device (10) comprises a heating device which is arranged to heat a combustion exhaust emission control element (17) of a motor vehicle
Is provided with a closed loop (10 b) for heating the air.
2. A heating device (10) according to claim 1, characterized in that the closed loop (10 b) comprises a heating element (15) independent of the operation of the engine.
3. The heating device (10) as claimed in claim 2, characterized in that the heating element (15) is electrically driven, in particular an electrical heating grid.
4. A heating device (10) as claimed in any one of claims 1 to 3, characterized in that the air heating closed loop (10 b) comprises a conduit (11 a,11 b) connected to an exhaust line (20) downstream (17 b) and upstream (17 a) of the emission control element (17).
5. A heating device (10) according to any one of claims 1 to 4, characterized in that the air heating closed loop (10 b) comprises elements for forced air circulation (12) with low flow rate.
6. The heating device (10) according to any one of claims 1 to 5, wherein the closed heating loop (10 b) comprises an air circulation control valve (14) arranged upstream of the heating element (15) in the air circulation direction.
7. The heating device (10) according to any one of claims 1 to 6, wherein the closed heating loop (10 b) forms part of a combustion exhaust gas recirculation circuit (20 r).
8. A low pressure combustion exhaust gas recirculation circuit (20 r) comprising a heating device (10) as claimed in any one of claims 1 to 7 for heating an emission control element (17).
9. A method (100) for managing a heating device for heating an emission control element of a thermal engine according to any one of claims 1 to 7, the method comprising:
verifying a condition indicating that the emission control element needs to be heated,
a step of heating the air in the closed loop with forced air circulation resulting in an increase in the temperature of the emission control element,
-a step of stopping heating the emission control element in case the start of the hot engine is authorized.
10. A method (110) for managing a combustion exhaust gas recirculation circuit (20 r) of an exhaust line of a thermal engine according to claim 8, characterized in that the opening of the EGR valve is accompanied by a forced circulation of combustion exhaust gases of the combustion exhaust gas recirculation circuit.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2021/053509 WO2022171298A1 (en) | 2021-02-12 | 2021-02-12 | Egr system with preheating of an emission control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117677763A true CN117677763A (en) | 2024-03-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180092765.0A Pending CN117677763A (en) | 2021-02-12 | 2021-02-12 | EGR system for preheating emission control devices |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4291761A1 (en) |
| CN (1) | CN117677763A (en) |
| WO (1) | WO2022171298A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2880068A1 (en) * | 2004-12-28 | 2006-06-30 | Renault Sas | Diesel engine control method for e.g. car, involves reintroducing external and internal exhaust gas recirculation gas, coming from exhaust or inlet valve, in cylinder during different operation points of diesel engine |
| FR2981983B1 (en) | 2011-10-26 | 2013-12-27 | Peugeot Citroen Automobiles Sa | EXHAUST GAS DELETION DEVICE FOR AN INTERNAL COMBUSTION ENGINE. |
| DE102015015794A1 (en) * | 2015-12-02 | 2016-08-11 | Daimler Ag | A method for heating an exhaust aftertreatment device of a motor vehicle, in particular a hybrid vehicle |
| US10167795B2 (en) * | 2017-04-05 | 2019-01-01 | GM Global Technology Operations LLC | Exhaust gas treatment system warm-up methods |
| KR102451916B1 (en) * | 2018-05-16 | 2022-10-06 | 현대자동차 주식회사 | Hybrid vehicle and method of controlling the same |
-
2021
- 2021-02-12 EP EP21705179.6A patent/EP4291761A1/en active Pending
- 2021-02-12 CN CN202180092765.0A patent/CN117677763A/en active Pending
- 2021-02-12 WO PCT/EP2021/053509 patent/WO2022171298A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| EP4291761A1 (en) | 2023-12-20 |
| WO2022171298A1 (en) | 2022-08-18 |
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