CN101316994A - Device for treating nitrogen oxides of motor vehicle exhaust gases - Google Patents

Device for treating nitrogen oxides of motor vehicle exhaust gases Download PDF

Info

Publication number
CN101316994A
CN101316994A CNA2006800442903A CN200680044290A CN101316994A CN 101316994 A CN101316994 A CN 101316994A CN A2006800442903 A CNA2006800442903 A CN A2006800442903A CN 200680044290 A CN200680044290 A CN 200680044290A CN 101316994 A CN101316994 A CN 101316994A
Authority
CN
China
Prior art keywords
amount
nox
motor
power system
upstream
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CNA2006800442903A
Other languages
Chinese (zh)
Inventor
C·塔查
J-C·贝齐亚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
Original Assignee
Renault SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of CN101316994A publication Critical patent/CN101316994A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • 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
    • F01N3/101—Three-way catalysts
    • 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
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
    • F02D41/1441—Plural sensors
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Materials Engineering (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

A propulsion system, in particular for a motor vehicle, comprises an internal combustion engine (1), a catalyst (5) for reducing nitrogen oxides Nox contained in the exhaust faces of the internal combustion engine (1), an additional fuel injector (4) arranged upstream of the catalyst (5) and means (6, 3) for determining the quantity of the nitrogen oxides Nox received from the internal combustion engine (1). The inventive propulsion system also comprises means (6, 10) for determining a fuel quantity required for attaining a proportion lower or substantially equal to a stoichiometric proportion with respect to the nitrogen oxide Nox quantity and means (6) for triggering the injection of said required quantity when the ratio therebetween and the nitrogen oxide Nox quantity is less than the triggering threshold.

Description

The device that is used for the nitrogen oxide of processor motor vehicle exhaust
Technical field
The present invention relates to power system, especially for the field of the power system (systeme demotorisation) of Motor Vehicle.In particular, the present invention relates to be used for the field of apparatus and method of the nitrogen oxide (NOx) of catalytic treatment I. C. engine exhaust.
Background technique
Known at present, nitrogen oxide can cause the infection and the allergy of respiratory tract, and can influence the formation of flue dust and acid rain.Most countries has been executed the standard of restriction from the discharged nitrous oxides of vehicle.For private vehicle, commerial vehicle and industrial engine, the threshold value that these standard General provisionss are different.In fact, every kind in these kinds has all been contained the motor in the very wide scope.For example, private vehicle comprises the vehicle that has petrolic vehicle and have diesel engine.Private vehicle comprises micropolis vehicle and four-wheel drive vehicle.With make mini engine reach identical pollutant emission threshold value to compare, make high power engine reach the processing of the nitrogen oxide NOx that identical pollutant emission threshold value need strengthen.In addition, compare, make micropolis provide the economic pressures of the device that cheap being used to handle nitrogen oxide bigger with vehicle with luxury vehicle.
Developed the effulent that some technology reduce nitrogen oxide NOx.Especially, utilize the passive method of the catalyst converter that passes for exhaust and utilize between the active method of complex process (as electrochemical catalysis effect or photocatalysis method) and have difference.Passive catalysis process is generally used for the petrol engine vehicle.Ternary catalyzing unit is used for handling simultaneously nitrogen oxide, hydrocarbon and the hydrocarbon of combustion not.The reduction composition is rich in exhaust from petrolic firing chamber usually, as hydrocarbon and carbon monoxide, so by using ternary catalyzing unit that the nitrogen oxide (NOx) of discharging is reduced into nitrogen.These ternary catalyzing units have cheap advantage.
The firing chamber of diesel engine is supplied to the mixture that comprises excess air.Therefore the exhaust from motor lacks reducing agent.Because reduce rapidly, so cannot use ternary catalyzing unit at the reduction efficiency that has these catalyst converters under the situation of oxygen.
In exhaust, lack under the situation of reducing agent, proposed the NOx catcher and handled nitrogen oxide.In patent application EP 0 573 672 A1 (Toyota) and EP 1 079 084 A2 (Toyota), such NOx catcher has been described especially.During the travelling usually of vehicle, the NOx catcher is passed in exhaust, generally comprise alkalescence at this catcher place catalyst converter or alkaline earth element and storage mixture (adsorptivity mixture).These catalyst converters impel nitrous oxide NO to be oxidized to nitrogen dioxide NO 2And impel nitrogen dioxide NO 2Be converted to nitrate, this azotate deposition is in aggregates.In the common operational phase of motor, NOx is absorbed by the NOx catcher.Periodically the NOx that is stored is discharged.During this release stage, the ratio of exhaust reducing agent is higher than the ratio of stoichiometric(al) (mixture is called dense).Controlling this NOx processing is complicated process, must detect the release stage in this process, and must increase the amount of the hydrocarbon that sprays.The storage mixture of NOx catcher is responsive especially to sulphur.With the NOx storing process concurrently, be necessary to develop the step of carrying out desulfurization at interval with (time) of rule.
Patent application WO 02/31325 (Corning Inc.) has described a kind of method of the nitrogen oxide that is used for reducing diesel engine exhaust.This method comprises burner oil in exhaust constantly, and makes the mixture of fuel and exhaust pass catalyst converter, thereby makes the NOx in the exhaust be reduced into nitrogen.This process has the shortcoming that causes the fuel consumption of adding.
Patent application US 2004/0083722 (Ford) has described a kind of improved by using catalyst converter to transform NOx (method), wherein be in emitted dose under the steady-state operation condition and revise fuel quantity, thereby motor is quickened and the decelerating phase is taken into account in the catalyst converter injected upstream with reference to motor.Described catalyst converter is ALNC or SCR type, initiatively sprays this catalyst converter reducing NOx emissions thing constantly by reducing agent (hydrocarbon or urea).Although improve to some extent, in described example, the ratio of spraying under equilibrium condition is: reducing agent is 10 times of NOx.Although improve to some extent, the fuel that this system consumption is quite a large amount of.
Summary of the invention
The invention provides a kind of power system (especially for Motor Vehicle) and a kind of method that is used to handle the power system exhaust, described system and method has improved described shortcoming, especially, described system and method provides cheap nitrogen oxide NOx to handle, and reduces extra fuel consumption.
According to one embodiment of the invention, power system (especially for Motor Vehicle) comprises explosive motor, the catalyst converter of the nitrogen oxide NOx that the engine exhaust that is used for reducing contains, be arranged on the additional fuel sparger of catalyst converter upstream, be used for determining the device of the nitrogen oxide NOx amount of discharging from motor, be used for determining that amount with respect to nitrogen oxide NOx reaches the device of fuel quantity that is lower than or equals the ratio needs of stoichiometric/chemical equivalent (stoechiom é trique) ratio substantially, and the device of injection that triggers the amount of described needs when being used for ratio when the amount of the amount of described needs and nitrogen oxide NOx less than activation threshold value.
Be appreciated that this catalyst converter that can utilize cheapness for the power system of the basic NOx reduction catalyst converter that crosses for the mixture of stoichiometric, the catalyst converter of for example known three-element catalytic type that is used for the petrol engine vehicle of comprising.In addition, as long as the ratio of the amount of amount to be sprayed and NOx is lower than activation threshold value, just can avoid the fuel consumption of adding.In other words, when the amount of the NOx in being present in exhaust does not reach the limit of permission (regulation), for example by the limit of standard permission, the injection that does not add.For the situation of micropolis, only just can exceed this limit, the stage that described operation phase such as motor are colder, acceleration is high or engine load is high usually in some operation phase of vehicle with vehicle.Because the fuel quantity that (use) is used to regulate injection has limited described fuel quantity to reach the device of stoichiometric ratio.In fact, NOx discharges the higher motor operation phase also corresponding to the stage of more being rich in unburned hydrocarbons and reducing agent under the vent ratio equilibrium condition.(at this moment) lower for reaching the diesel oil amount that stoichiometric need spray.
Advantageously be that the exhaust in additional sparger upstream lacks reducing agent.Motor can be the diesel-type motor, and the fuel that is sprayed by additional sparger can be diesel fuel.
According to another embodiment, be used for determining that the device of NOx amount comprises computer, this computer is suitable for receiving engine speed data and to the data of the indoor injection of engine combustion, and is suitable for the data of these data of comparison and storage.Advantageously, this device is included in the device that is used to measure the exhaust fuel air ratio of engine downstream, additional sparger upstream.
According to another embodiment, power system is included in particulate filter catalyst converter upstream or downstream or that combine with catalyst converter.Additional sparger can be placed in the upstream of particulate filter, thereby and can activated regenerate particulate filters.
Advantageously, power system comprises second instrument that is used to measure at the reductant concentration of additional sparger downstream, catalyst converter upstream.This second instrument can be included in the temperature transducer in particulate filter upstream or downstream, and/or at the pressure transducer in particulate filter upstream or downstream.
According to another embodiment of the present invention, power method (especially for Motor Vehicle), comprise a step, wherein handle exhaust from internal-combustion engine by in the gas exhaust piping of NOx reduction catalyst converter upstream, spraying hydrocarbon, and the amount of the NOx that exists in the exhaust of definite sparger upstream, when reaching the threshold value of NOx amount, trigger hydrocarbon injection, emitted dose is adjusted to makes the amount of reducing agent be lower than or equal the stoichiometric ratio substantially with respect to the amount of the NOx that exists in the exhaust.
Description of drawings
By reading the detailed description to a plurality of unrestriced exemplary embodiments shown in the drawings, other characteristic of the present invention and advantage will manifest, and wherein, unique accompanying drawing illustrates a plurality of schematic representation according to power system of the present invention.
Embodiment
As shown in FIG., the Motor Vehicle power system comprises a diesel-type internal-combustion engine 1 and a gas exhaust piping 2, and this gas exhaust piping 2 comprises 2a of first portion that is adjacent to internal-combustion engine 1 downstream and the second portion 2b that is right after in first portion 2a downstream.
As schematically showing by dotted line, shown in the figure aspect the second portion 2b of gas exhaust piping 2 mutually different four embodiments.
In first embodiment, the 2a of first portion of gas exhaust piping 2 comprises a lambda (λ) type fuel air ratio sensor 3, or to the lambda sensor from the ratio sensitivity of the oxygen in the exhaust of internal-combustion engine 1.In the 2a of first portion, embed one and add sparger 4 in the downstream of fuel air ratio sensor 3.The second portion 2b of first embodiment's gas exhaust piping 2 comprises a catalyst converter 5.Power system also comprises a computer 6.
Explanation first embodiment's operation now.Diesel engine is equipped with crankshaft rotational speed sensor 7 (not shown), is used for the sensor 8 of the injection conditions of detection of engine 1 main injection.For example, this sensor can be the sensor in accelerator position sensor or the main injection control loop.Alternatively, motor is equipped with the chamber temperature sensor.The data that spread out of from these sensors are passed to computer 6.Similarly, the data about employed fuel type can be transfused to and be delivered to computer 6.The working speed of different motors is stored in the computer 6 with respect to the complete arteries and veins spectrogram of the relation of employed fuel characteristic.This makes computer can determine engine speed, and the amount of the ratio of definite in real time nitrogen oxide of overflowing from the firing chamber of motor 1 and unburned hydrocarbons of overflowing from the firing chamber of motor 1 or reduction composition.Computer 6 can be determined the amount of the reduction composition that need be sprayed by additional sparger 4 then, makes that the amount of oxidizing component of the gaseous mixture revised thus is the stoichiometric ratio with the ratio of reducing between the amount of composition.
When computer 6 activates additional sparger 4, and when triggering the injection of amount of described needs, the mixture that passes catalyst converter 5 has the stoichiometric ratio of hope.The condition of the diesel injection of triggering in gas exhaust piping (fuel air ratio of gaseous mixture in NOx amount of being discharged by motor and the firing chamber) can be modified to adapt to the variation in for example effective rules.This condition is corresponding to the NOx ratio of reducing by the effect of catalyst converter 5 before discharging from gas exhaust piping 2.The stoichiometric ratio of wishing also can be corresponding to the maximum flow of the NOx that is not reduced by catalyst converter 5.When computer 6 did not activate additional sparger 4, all NOx that discharge from internal-combustion engine 1 passed catalyst converter 5, and the content of reducing agent is low in the mixture causes the reduction efficiency of catalyst converter 5 significantly to reduce.
In a modified example, the stoichiometric ratio of hope equals " 1 " makes all NOx that exist in the exhaust all can be handled by catalyst converter 5.In another modified example, this ratio is less than " 1 ", and this helps to save for satisfying the additional fuel that consumes when current standard is handled the NOx that exists in the exhaust a part of.
Computer also stores the sparger activation threshold value.Computer receives the real time data of engine speed, also calculates the amount of the NOx that exists in real time and reach the fuel quantity of the stoichiometric ratio needs of hope from the exhaust that motor is discharged.When the ratio of the fuel quantity of needs and nitrogen oxide was lower than activation threshold value, computer actuated was added sparger, when this ratio is higher than threshold value, did not order additional the injection.The ratio that is higher than activation threshold value is corresponding to the NOx amount of discharging from motor 1, the additional fuel that being used for more than this can need very manages at catalyst converter everywhere.
According to another embodiment of the present invention, the fuel air ratio that leaves the exhaust of motor is not to try to achieve by the data and the measurement of engine rotate speed value that compare MANUFACTURER, but directly measure by fuel air ratio sensor 3.Computer 6 calculates the fuel quantity of the stoichiometric ratio needs that reach hope, and the ratio of the NOx of amount that relatively needs and estimation amount, triggers additional injection if this ratio is lower than activation threshold value.Present embodiment is used for estimating better the amount to be sprayed of needs by in conjunction with real-time measuring data and calculated data.This also be used for relatively calculating prearranging quatity and the amount that records, thereby detecting sensor or computing system is any unusual.
The reducing agent that is sprayed by additional sparger 4 needn't be identical with the fuel that internal-combustion engine 1 uses.Yet, use the situation of equal fuel can avoid to adding the needs of fuel tank.Described internal-combustion engine is diesel engine preferably, and the fuel that is sprayed by additional sparger is diesel fuel.In diesel engine, usually air inlet system in the firing chamber and the injection apparatus in the firing chamber are arranged so that the firing chamber is full of oxygen.Therefore the exhaust from diesel engine generally is an oxidability.
The NOx effulent is limited by the concentration of reducing agent in the exhaust of the diesel engine of the incendiary type work that is called homogeneous charging burning is higher, and therefore additional fuel amount to be sprayed remains lower.
Power method of the present invention and system can be compatible with the internal-combustion engine that uses gasoline, and wherein exhaust lacks the reduction composition.For example, in the motor of stratified charge burning, although lower combustion temperature reduces the NOx amount that is produced by motor, method of the present invention still can be used in conjunction with the advantage of ternary catalyzing unit and the advantage of low fuel consumption very.
Sparger 4 is to be ad hoc and to append to the form of main ejector (not shown) of internal-combustion engine 1 additional with this sparger 4.This sparger 4 can be arranged to be close to the ingress of catalyst tank 5.Sparger 4 also can be formed by main ejector, and sparger 4 is to be that to be additional to the form of emission sequence of motor 1 common spraying cycle additional with the emission sequence that relates to by flip flop equipment of the present invention in this case.When this additional injection can occur in gas and begins to discharge from the firing chamber.
Describe now and use particulate filter to combine with the particularly advantageous of this power system.
According to second embodiment as shown in the figure, the second portion 2b of gas exhaust piping comprises along gas flow direction: the second fuel air ratio sensor 10, catalyst converter 5, upstream temperature and pressure transducer 11, particulate filter 12 and downstream temperature and pressure transducer 13.But particulate filter 12 is used for staying the carbon black of discharging from motor 1 and does not fire particle.Particulate filter 12 can be catalytic type or the on-catalytic type.At the common run duration of motor 1, the second fuel air ratio sensor 10 in additional sparger 4 downstreams is used to control the calculating of amount to be sprayed to reach the stoichiometric condition.Additional sparger 4, the 2nd lambda type sensor 10 and temperature transducer 11 and 13 also are used for regenerate particulate filters.The exhaust that exothermic reaction enters particulate filter with heating under the temperature that is being enough to make carbon black and the particle burning that leaches takes place in catalyst converter 5.For the catalytic type particulate filter, be lower than on-catalytic type particulate filter for reaching the delivery temperature that needs of regenerating.
Among the 3rd embodiment as shown in the figure, the second portion 2b of gas exhaust piping 2 comprises along gas flow direction: upstream temperature and/or pressure transducer 11, particulate filter 12, downstream temperature and/or pressure transducer 13, the second fuel air ratio sensor 10 and catalyst converter 5.
Among the 4th embodiment as shown in the figure, the second portion 2b of gas exhaust piping 2 comprises along gas flow direction: the second fuel air ratio sensor 10, upstream sensor 11, the catalyst converter 5 that combines with particulate filter 12 and downstream sensor 13.The 4th embodiment has the advantage that has reduced mounted component number on gas exhaust piping 2.Yet aspect the layout of different parts, the second and the 3rd embodiment provides greater flexibility.
Among described three embodiments each all comprises particulate filter 12, and this filter can comprise emery, steinheilite, or be used for any other pottery or the Structural Hardware of filtering particle.
The device that is used for determining the amount of nitrogen oxides of discharging from motor 1 can be a computer 6, and this computer is measurement of engine rotate speed value and the arteries and veins spectrogram that is stored in this scheduled operation in the computer relatively in real time.
The device that is used to determine to reach the fuel quantity of stoichiometric ratio needs also can be a computing device, and this computing device is real-time measurement values and predetermined arteries and veins spectrogram relatively, perhaps also can be the second fuel air ratio sensor 10.
The present invention is used for obtaining with the power system development cost that is lower than NOx capture type system the NOx treatment effeciency of hope with the cost of the additive decrementation of control.
The flexibility of this method is particularly conducive to the power system that is used for the building site, and wherein main standard is not extra consumption, and will preferentially handle nitrogen oxide fully.For making this power system be suitable for the building site, only need revise activation threshold value.

Claims (12)

1. power system, power system especially for Motor Vehicle, comprise explosive motor (1), the catalyst converter (5) of the nitrogen oxide NOx that the exhaust of described motor (1) of being used for reducing contains, the device (6 of the amount of the nitrogen oxide NOx that is arranged on the additional fuel sparger (4) of catalyst converter (5) upstream and is used for determining discharging from motor (1), 3), it is characterized in that, this power system comprises that the amount that is used for determining with respect to nitrogen oxide NOx reaches the device (6 of amount that is lower than or equals the needed fuel of ratio of stoichiometric ratio substantially, 10) and be used for when the ratio of the amount of the amount of described needs and nitrogen oxide NOx is lower than activation threshold value, triggering the device (6) of injection of the amount of described needs.
2. power system according to claim 1 is characterized in that, motor (1) is the diesel internal combustion motor, and the fuel that is sprayed by additional sparger (4) is diesel fuel.
3. power system according to claim 1 and 2, it is characterized in that, the device that is used for the amount of definite NOx comprises computer (6), this computer (6) is suitable for receiving the rotary speed data of motor (1) and the data of the injection in the firing chamber of motor (1), and the data that are suitable for more described data and storage.
4. each described power system in requiring according to aforesaid right is characterized in that, the device that is used for the amount of definite NOx is included in the instrument that is used to measure the exhaust fuel air ratio (3) of motor (1) downstream, additional sparger (4) upstream.
5. each described power system in requiring according to aforesaid right is characterized in that this system is included in the particulate filter (12) in catalyst converter (5) upstream or downstream.
6. according to each described power system in the claim 1 to 4, it is characterized in that this system comprises the particulate filter (12) that combines with catalyst converter (5).
7. according to claim 5 or 6 described power systems, it is characterized in that described additional sparger (4) is placed in the upstream of particulate filter (12), this additional sparger (4) thus activated regenerate particulate filters (12).
8. according to each described power system in the claim 5 to 7, it is characterized in that this system comprises second instrument (10) that is used for measuring at the reductant concentration of additional sparger (4) downstream, catalyst converter (5) upstream.
9. according to each described power system in the claim 5 to 8, it is characterized in that, this system is included in the temperature transducer of particulate filter (12) upstream (11) or downstream (13), and/or in particulate filter (12) upstream (11) or the pressure transducer of downstream (13).
10. according to a kind of application of each described power system in the aforementioned claim, wherein, the device (6,3) that is used for determining the amount of nitrogen is determined the ratio of the nitrogen oxide of overflowing from the firing chamber of motor (1).
11. the application of power system according to claim 10 is characterized in that, the exhaust in additional sparger (4) upstream lacks reducing agent.
12. power method, the spy is the power method that is used for Motor Vehicle, wherein, by handle exhaust to injection hydrocarbon in the gas exhaust piping (2a) of NOx reduction catalyst converter (5) upstream from explosive motor (1), it is characterized in that, this method comprises a step, in this step, determine the amount of the NOx that in the exhaust of sparger upstream, exists, trigger the injection of hydrocarbon when the threshold value of the amount that reaches NOx, the amount that emitted dose is regulated such that reducing agent is lower than with respect to the amount of the NOx that exists in the exhaust or equals the stoichiometric ratio substantially.
CNA2006800442903A 2005-10-27 2006-10-20 Device for treating nitrogen oxides of motor vehicle exhaust gases Pending CN101316994A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0510991A FR2892766A1 (en) 2005-10-27 2005-10-27 Propulsion system for motor vehicle e.g. commercial vehicle, has logic controller triggering injection of required quantity when ratio between required quantity and nitrogen oxide quantity is less than triggering threshold
FR0510991 2005-10-27

Publications (1)

Publication Number Publication Date
CN101316994A true CN101316994A (en) 2008-12-03

Family

ID=36658771

Family Applications (1)

Application Number Title Priority Date Filing Date
CNA2006800442903A Pending CN101316994A (en) 2005-10-27 2006-10-20 Device for treating nitrogen oxides of motor vehicle exhaust gases

Country Status (6)

Country Link
US (1) US20080282680A1 (en)
EP (1) EP1941136A2 (en)
JP (1) JP2009513868A (en)
CN (1) CN101316994A (en)
FR (1) FR2892766A1 (en)
WO (1) WO2007048961A2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102449279A (en) * 2009-05-27 2012-05-09 宝马股份公司 Sensor for detecting the amount of a reducing agent and the amount of a pollutant in an exhaust gas
CN102817682A (en) * 2012-08-03 2012-12-12 陈志华 Non-automotive heavy-duty diesel engine SCR (semiconductor control rectifier) device and method
CN105569779A (en) * 2014-11-05 2016-05-11 罗伯特·博世有限公司 Off-gas treatment system and method used for diesel engine

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009264176A (en) * 2008-04-23 2009-11-12 Yanmar Co Ltd Gas engine control device
US10180096B2 (en) * 2014-06-11 2019-01-15 Tenneco Automotive Operating Company Inc. Fluid delivery system with line pressure control valve
US10202883B2 (en) 2014-11-21 2019-02-12 Tenneco (Suzhou) Emission System Co., Ltd. Common rail assembly, urea injection system and application thereof
CN105673154B (en) 2014-11-21 2019-11-08 天纳克（苏州）排放系统有限公司 Common rail, the application of the common rail, urea injection system and its control method
KR101734710B1 (en) * 2015-12-07 2017-05-11 현대자동차주식회사 A method for preventing to regenerate dpf frequently using a method for analyzing driving pattern of vehicle
CN109944706B (en) * 2019-03-29 2022-06-24 潍柴动力股份有限公司 Method and device for regulating and controlling nitrogen oxide emission
NL2025940B1 (en) * 2020-06-29 2022-03-04 Daf Trucks Nv NOx and CO2 reduction with Hydrogen or Ammonia
CN114151217B (en) * 2021-11-29 2023-12-22 一汽解放汽车有限公司 Vehicle DPF protection method and protection system

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5412945A (en) 1991-12-27 1995-05-09 Kabushiki Kaisha Toyota Cho Kenkusho Exhaust purification device of an internal combustion engine
JPH07103021A (en) * 1993-10-05 1995-04-18 Fuji Heavy Ind Ltd Exhaust emission control device for vehicle
JP3852788B2 (en) * 1995-10-02 2006-12-06 株式会社小松製作所 Diesel engine NOx catalyst deterioration detection device and its deterioration detection method
JP3465490B2 (en) * 1996-09-09 2003-11-10 トヨタ自動車株式会社 Exhaust gas purification device for internal combustion engine
US6399034B1 (en) * 1997-05-14 2002-06-04 Hjs Fahrzeugtechnik Gmbh & Co. Process for reducing nitrogen oxides on SCR catalyst
DE19736384A1 (en) * 1997-08-21 1999-02-25 Man Nutzfahrzeuge Ag Method for metering a reducing agent into nitrogen oxide-containing exhaust gas from an internal combustion engine
JPH11324653A (en) * 1998-05-20 1999-11-26 Denso Corp Exhaust emission control device for internal combustion engine
JP3304929B2 (en) 1999-08-26 2002-07-22 トヨタ自動車株式会社 Internal combustion engine
DE10023439A1 (en) * 2000-05-12 2001-11-22 Dmc2 Degussa Metals Catalysts Process for removing nitrogen oxides and soot particles from the lean exhaust gas of an internal combustion engine and exhaust gas purification system therefor
JP3613676B2 (en) * 2000-07-24 2005-01-26 トヨタ自動車株式会社 Exhaust gas purification device for internal combustion engine
US6826906B2 (en) * 2000-08-15 2004-12-07 Engelhard Corporation Exhaust system for enhanced reduction of nitrogen oxides and particulates from diesel engines
US6919047B1 (en) 2000-10-10 2005-07-19 Corning Incorporated Reduction of nitrogen oxides in diesel exhaust gases and fuel injection system
US6415602B1 (en) * 2000-10-16 2002-07-09 Engelhard Corporation Control system for mobile NOx SCR applications
US7121085B2 (en) * 2001-09-04 2006-10-17 Ford Global Technologies, Llc Method and apparatus for controlling hydrocarbon injection into engine exhaust to reduce NOx
JP3861733B2 (en) * 2002-04-04 2006-12-20 トヨタ自動車株式会社 Exhaust gas purification device for internal combustion engine
DE10218232A1 (en) * 2002-04-24 2003-11-06 Opel Adam Ag Process for improving effectiveness of diesel fuel injected into exhaust gas pipe of an I.C. engine in front of an SCR catalyst comprises converting diesel fuel by partial cracking into an active form before conversion of nitrogen oxides
GB0211971D0 (en) * 2002-05-24 2002-07-03 Johnson Matthey Plc Spark ignition engine including three-way catalyst
US20040083722A1 (en) 2002-11-06 2004-05-06 Ford Global Technologies, Inc. Diesel aftertreatment systems
DE10300298A1 (en) * 2003-01-02 2004-07-15 Daimlerchrysler Ag Exhaust gas aftertreatment device and method
DE602004006415T2 (en) * 2003-06-18 2008-01-10 Johnson Matthey Public Ltd., Co. PROCESS FOR CONTROLLING THE REDUCTION ADDITIVE

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102449279A (en) * 2009-05-27 2012-05-09 宝马股份公司 Sensor for detecting the amount of a reducing agent and the amount of a pollutant in an exhaust gas
US8601795B2 (en) 2009-05-27 2013-12-10 Bayerische Motoren Werke Aktiengesellschaft Sensor for detecting the amount of a reducing agent and the amount of a pollutant in an exhaust gas
CN102449279B (en) * 2009-05-27 2015-01-28 宝马股份公司 Sensor for detecting the amount of a reducing agent and the amount of a pollutant in an exhaust gas
CN102817682A (en) * 2012-08-03 2012-12-12 陈志华 Non-automotive heavy-duty diesel engine SCR (semiconductor control rectifier) device and method
CN105569779A (en) * 2014-11-05 2016-05-11 罗伯特·博世有限公司 Off-gas treatment system and method used for diesel engine

Also Published As

Publication number Publication date
WO2007048961A3 (en) 2007-06-14
JP2009513868A (en) 2009-04-02
EP1941136A2 (en) 2008-07-09
US20080282680A1 (en) 2008-11-20
WO2007048961A2 (en) 2007-05-03
FR2892766A1 (en) 2007-05-04

Similar Documents

Publication Publication Date Title
CN101316994A (en) Device for treating nitrogen oxides of motor vehicle exhaust gases
CN102312712B (en) System and method for determining an age of and controlling a selective catalytic reduction catalyst
US6615580B1 (en) Integrated system for controlling diesel engine emissions
US8826644B2 (en) Engine and exhaust aftertreatment control
CN101578434B (en) Device for judging deterioration of catalyst
US20100107610A1 (en) Exhaust System for an Internal Combustion Engine
US20150143798A1 (en) System and method of purifying exhaust gas
WO2013172215A1 (en) Exhaust gas purification system and method for purifying exhaust gas
EP3111071A1 (en) Method and system for controlling nitrogen oxide emissions from a combustion engine
WO2013168677A1 (en) Exhaust gas purification system and exhaust gas purification method
JPH08509795A (en) Method and apparatus for controlled injection of regenerating agent into exhaust gas containing nitrogen oxides
CN107023355A (en) Waste gas cleaning system and its control method
CN102486110B (en) For predicting the regeneration method of DeNOx catalyst and using the exhaust system of the method
CN106523089A (en) METHOD FOR REGENERATING LEAN NOx TRAP OF EXHAUST PURIFICATION SYSTEM PROVIDED WITH LEAN NOx TRAP AND SELECTIVE CATALYTIC REDUCTION CATALYST AND EXHAUST PURIFICATION SYSTEM
KR101886088B1 (en) System and method of purifying exhaust gas
US9594067B2 (en) Systems and methods for determining the quantity of a combustion product in a vehicle exhaust
CN101008335A (en) Exhaust emission control device of internal combustion engine
US9644513B2 (en) Method of regenerating lean NOx trap of exhaust purification system provided with lean NOx trap and selective catalytic reduction catalyst and exhaust purification system
CN102889108A (en) Exhaust aftertreatment system for compression-ignition engines
CN103732873A (en) Exhaust purification device of internal combustion engine
JP2003148132A (en) Exhaust emission control device and method for internal combustion engine
CN108571364B (en) Determination of Selective catalytic reduction efficiency
US9523974B2 (en) Method of controlling operation of an exhaust fluid treatment apparatus
US8763373B2 (en) System for purifying exhaust gas and method for controlling the same
CN105765186A (en) Exhaust purification device for internal combustion engine

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication

Open date: 20081203