CN1891991B - Exhaust-control device of engine - Google Patents
Exhaust-control device of engine Download PDFInfo
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- CN1891991B CN1891991B CN2005100819432A CN200510081943A CN1891991B CN 1891991 B CN1891991 B CN 1891991B CN 2005100819432 A CN2005100819432 A CN 2005100819432A CN 200510081943 A CN200510081943 A CN 200510081943A CN 1891991 B CN1891991 B CN 1891991B
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- 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
- Y02T10/40—Engine management systems
Abstract
The invention discloses an exhaust control device, where ternary catalyzer and thin NOx collector are installed in a single casing; exhaust cooler can be located in the upper part of the thin NOx collector to reduce the temperature of exhaust to pass through the thin NOx collector and is allowed to be close to the outlet of an engine.
Description
Technical field
The present invention relates to internal-combustion engine, relate in particular to the device of the discharging that can reduce lean-burn internal combustion engine.
Background technique
Knownly provide a kind of internal-combustion engine, it can move under more than a kind of combustion mode, such as lean mode, stoichiometric (stoichiometric) combustion mode and dense combustion pattern.
In order to reduce the discharging of this motor, under theoretical ratio combustion pattern or dense combustion pattern, use ternary catalyzing unit, but operate in lean mode following time at motor, this catalyst converter is invalid, therefore rare NOx trap (trap) also is used usually.
But be to use rare NOx trap that such problem is arranged: if bootup window effectively just must make it operate in the quite limited temperature range, if too high and the endurance is oversize through its temperature of exhaust, then its performance will descend fast.
Summary of the invention
The purpose of this invention is to provide a kind of emission control system, this emission control system can make rare NOx trap be positioned near the exhaust outlet of motor, and can be manufactured in more economical mode.
According to a first aspect of the invention, a kind of emission control system of internal-combustion engine is provided, wherein internal-combustion engine can operate under several combustion modes, and a kind of combustion mode in described several combustion modes is a lean mode, and described device comprises: housing, described housing has inlet, be used in use receiving exhaust from motor, and described housing has outlet, in use treated exhaust is flowed out from described outlet, wherein, ternary catalyzing unit and rare NOx trap are positioned at housing.
Ternary catalyzing unit can be positioned at the upstream of rare NOx trap.
Preferably, ternary catalyzing unit and rare NOx trap form single unit in housing.
The inlet of housing can be connected to exhaust header, and the exhaust header guiding is from the exhaust of motor.
Vent gas cooler can be installed in the housing and in the upstream of rare NOx trap.
Housing can provide first passage, is used in use directing exhaust gas through vent gas cooler, and second channel can be provided, and is used in use directing exhaust gas so that make exhaust walk around vent gas cooler.
At least one valve can be set, be used in use controlling blast air through vent gas cooler.
Described valve can be operated with the blast air of control through first passage.
Described valve can be operated with the blast air of control through second channel.
Described valve can be operated with the blast air of control through first and second passages.
Preferably, can be by being installed in each fly valve control the flowing on the common shaft through each passage.
The fly valve that is used for the blast air of the first passage of flowing through is controlled can be installed in main shaft, and meets at right angles with the fly valve that the blast air of the second channel of flowing through is controlled.
Alternatively, second channel can be arranged in first passage, makes second channel through vent gas cooler.
First and second passages can be provided with one heart.
Described valve or each valve can be controlled, to guarantee when motor moves with high capacity almost all exhausts vent gas cooler of all flowing through.
Described valve or each valve can be controlled, make at least to operate in lean mode following time at motor, and the temperature of the exhaust of rare NOx trap of flowing through is controlled.
Emission control system can also comprise: exhaust turbine supercharger, and described exhaust turbine supercharger has housing, is used to hold compressor and turbine; And valve control wastegate passage, being used for walking around selectively the turbine of turbosupercharger, its middle shell is provided for receiving the exhaust from turbosupercharger and wastegate passage.
Can form the wastegate passage by the independent pipeline with entry end and outlet end, wherein said entry end is operatively coupled on the upstream of turbine, and described outlet end is connected the downstream of turbine.
In use, exhaust gas by-pass valve can be used for permitting blast air through the wastegate passage when predetermined engine operational conditions exists.
Predetermined engine operational conditions can be: when the pressure that produces when compressor reaches predetermined limits, when motor operates in high capacity following time, perhaps when the temperature of rare NOx trap need remain in the predetermined limits.
Vent gas cooler can be installed in the wastegate passage.
Optionally, vent gas cooler can be installed in the downstream of the turbine of turbosupercharger.
At least one bypass valve can be set, be used in use the blast air through vent gas cooler being controlled.
Passage can be set, be used in use walking around selectively vent gas cooler.
Described bypass valve can be provided for the blast air through bypass passageways is controlled.
Described bypass valve can be provided for guaranteeing operating in high capacity following time at motor, and almost all vent gas cooler is all flow through in exhausts.
Described bypass valve can be controlled, makes at least when motor operates in lean mode, and the temperature of the exhaust of rare NOx trap of flowing through is controlled.
According to a second aspect of the invention, a kind of internal-combustion engine that can operate at least under the lean mode is provided, wherein, described motor has the emission control system according to first aspect of the present invention, and described emission control system is operably connected to described motor to receive the exhaust from motor.
Description of drawings
With reference now to accompanying drawing,, by example the present invention is described, wherein:
Fig. 1 is according to the motor of first embodiment of the invention and the schematic representation of emission control system;
Fig. 2 is according to the motor of second embodiment of the invention and the schematic representation of emission control system;
Fig. 3 is the sectional view of getting along Fig. 2 center line A-A, shows the bypass passageways of the part of emission control system shown in formation Fig. 2 and the layout of vent gas cooler;
Fig. 4 is the sectional view of getting along Fig. 2 center line A-A, shows the bypass passageways of the part of emission control system shown in formation Fig. 2 and the optional layout of vent gas cooler;
Fig. 5 is according to the emission control system of third embodiment of the invention and the schematic representation of motor; And
Fig. 6 is according to the emission control system of fourth embodiment of the invention and the schematic representation of motor.
Embodiment
With reference to figure 1, show motor 10, described motor 10 has the exhaust header 11 that is connected thereto, and is used for directing exhaust gas and makes exhaust leave motor 10.Motor 10 may operate in three independently under the combustion mode, promptly, lean mode, stoichiometric(al) combustion mode and dense combustion pattern, air/fuel ratio is higher than the air/fuel ratio of stoichiometric(al) in lean mode, air/fuel ratio is a stoichiometric(al) in desirable ratio combustion pattern, and air/fuel ratio is lower than the air/fuel ratio of stoichiometric(al) in dense combustion pattern.
Emission control system has housing 22, and an end that may be operably coupled to exhaust header 11 of housing 22 is formed with inlet, and described housing 22 also is formed with outlet, and exhaust flows to the vent systems (not shown) from described outlet in the use.
Housing 22 is used to be installed in ternary catalyzing unit 14 and rare NOx trap 15, and described ternary catalyzing unit 14 and rare NOx trap form single unit and be arranged in the housing 22, make ternary catalyzing unit 14 be arranged on the upstream of rare NOx trap 15.In an example shown, ternary catalyzing unit 14 and rare NOx trap 15 are held togather by the supporting structure (not shown), but be appreciated that, they can be kept simply going up in position by housing 22, and they do not need to be fixed together, but can the setting but turn up the soil in the interval located adjacent one another.
Housing 22 also supports vent gas cooler 13, and vent gas cooler 13 is connected to the main cooling circuit (not shown) of motor 10, and freezing mixture is drawn through vent gas cooler 13 and returning from main cooling circuit.
Housing 22 limits two blast air passages 16,17, and vent gas cooler 13 is installed in the first passage 16, and second channel 17 is walked around vent gas cooler 13, in use works as vent gas cooler 13 when not required, and exhaust can be diverted by second channel 17.
Valve 12 can be operated with to controlling through the blast air of first and second passages 16 and 17, in this case, valve 12 can be operated with the limit (limit) at stroke and locate to cut out the inlet of first passage 16, and closes the inlet of second channel at another opposite limit place of stroke.Yet, should be appreciated that valve 12 can be configured to only open or close the inlet of second channel 17, and does not close or open first passage 16.This is because unblocked even the inlet of first passage keeps when the inlet of second channel 17 is opened, whole exhausts inlet of second channel of also all will flowing through almost is because the resistance of the second channel 17 of flowing through is far smaller than the resistance of the vent gas cooler 13 of flowing through.
Can use any device easily that valve 12 is activated, but in this example, vacuumizing actuator (not shown) is connected to valve 12.The vacuumizing actuator is subjected to the control of electronic control unit (not shown), and described electronic control unit is programmed and makes valve 12 move between its two limit when the specific engines operating conditions exists.In this example, control valve 12 suitably between two operating limits of valve 12, making in use can be to adjusting through the mobile of first passage 16 continuously, remains in the predetermined limits with the temperature of the exhaust that will enter rare NOx trap 15.In order to realize this point, one or more temperature transducer (not shown) is used, be used for monitoring the temperature that enters ternary catalyzing unit 14 and leave the exhaust of rare NOx trap 15, can know the estimated value of the temperature in rare NOx trap 15 thus by inference by electronic control unit.
The operation of emission control system is as follows.From cold start-up, need heat ternary catalyzing unit 14 apace, therefore, valve 12 is oriented to allow blast air to cross second channel 17 during beginning.When the temperature of ternary catalyzing unit 14 reaches catalyzer and has begun to live the temperature of (light off), the first passage 16 that valve 12 moved so that exhaust begins to flow through and through supercooler 13.Allow heat from exhaust, to be recovered and to be used for heating to flow through the freezing mixture of the main cooling circuit of motor 10 like this.
When motor 10 in low ambient temperature during cold start-up, more than operation has several advantages.At first, reach for operator cabin heating (cabin heating) useful required time of temperature, can improve the performance of operator cabin heater (cabin heater) by reducing freezing mixture; Secondly, can reduce motor 10 and reach its time that normal running temperature spent, thereby reduce during the motor initial launch use and discharging fuel.
In the normal process, when motor operates in lean mode following time under light or partial load condition, the temperature of exhaust of rare NOx trap 15 of needing to flow through remains in the limit that is rather narrow, be 400 to 450 degrees centigrade scope in the present example, still the structure according to rare NOx trap 15 also can be other limits.Therefore, when operating under this condition, valve 12 is under the control of electronic control unit, and can be operated to continuously change the blast air through supercooler 13, to obtain required temperature.Can guarantee like this: when motor 10 operates in lean mode following time, rare NOx trap 15 moves with peak efficiency.
When motor 10 stands height or complete loading condition, valve 12 moves under the control of electronic control unit, to close second channel 17, so that cooling effect maximization with cooler 13, thereby make rare NOx trap 15 keep cold as far as possible, but under this high load condition, insufficient if the heat of vent gas cooler is removed ability, the temperature of exhaust might surpass preferred 450 degrees centigrade temperature upper limit so.
Yet even temperature upper limit is exceeded, the emission performance of emission control system can seriously not influenced yet.This be because, under this load, motor will operate in outside the lean-burn operator scheme, and in most of the cases be to operate under the dense combustion operating mode, wherein rare NOx trap 15 is invalid, and is that ternary catalyzing unit 14 is used to remove undesirable pollutant from exhaust.Because ternary catalyzing unit 14 can operate in the wider temperature range effectively, and especially can move at high temperature, therefore the efficient of emission control system can not be subjected to bigger influence.Yet, will be appreciated that and wish to use vent gas cooler, so that the delivery temperature in rare NOx trap is remained near the upper limit, because will reduce the easily degeneration of rare NOx trap of degeneration when high temperature like this with enough capacity.
Therefore, as can be seen, the invention provides ternary catalyzing unit and rare NOx trap, they are encapsulated in the public jar or in the housing, compare as separate part manufacturing like this with them, can be manufactured more economically.In addition, if combine with vent gas cooler and switchable bypass, then Zu He catalyst converter/rare NOx trap can be installed near the exhaust outlet of motor, thereby improved (light off) performance of living that rises of catalyzer, improved emission performance thus with described catalyst converter/motor that rare NOx trap links to each other.
With reference to figure 2 and 3, show second embodiment according to emission control system of the present invention, described emission control system is used to be connected to the device of exhaust header 11 to replace formerly describing of motor 10.
Emission control system has housing 122, and an end place that may be operably coupled to exhaust header 11 of housing 122 is formed with inlet, and described housing 122 also be formed with the outlet 18, exhaust flows to the vent systems (not shown) from described outlet in the use.
Fly valve 12 can be operated with to controlling through the blast air of second channel, and two fly valve 112a, 112b are used to the blast air through first passage is controlled in addition.All three fly valves 112,112a, 112b are installed on the common shaft 120, and are configured to: the fly valve 112 that is used for second channel is provided with two fly valve 112a, 112b being used for first passage with meeting at right angles.Fly valve 112a, 112b can be operated the inlet with the opening and closing first passage, and remaining fly valve 112 is used to open and close the inlet of second channel.
It should be understood that being set to of fly valve: when the inlet of first passage was opened fully, the inlet of second channel is closed fully, and was perhaps opposite.
It should be understood, however, that optionally can have only a fly valve to be set up the inlet that only is used for opening or closing second channel, and not close or open first passage.This is because unblocked even the inlet of first passage keeps when the inlet of second channel is opened, almost whole exhausts also will be flow through the inlet of second channel.Be appreciated that further the present invention is not limited to the use fly valve, any suitable valve can be used.
Can make main shaft 120 rotations by any device easily, but in this example, vacuumizing actuator (not shown) is connected to main shaft 120.The vacuumizing actuator is subjected to the control of electronic control unit (not shown), and described electronic control unit is programmed and makes valve 112,112a, 112b open and close when the specific engines operating conditions exists.In this example, valve 112,112a and 112b are suitably controlled between their two operating limits, making in use can be to adjusting through the mobile of first passage continuously, remains in the predetermined limits with the temperature of the exhaust that will enter rare NOx trap 15.
In order to realize this point, one or more temperature transducer (not shown) is used, be used for monitoring the temperature that enters ternary catalyzing unit 14 and leave the exhaust of rare NOx trap 15, can know the estimated value of the temperature in rare NOx trap 15 thus by inference by electronic control unit.
The operation of emission control system is as follows.From cold start-up, need heat ternary catalyzing unit 14 apace under cold environmental conditions, therefore, valve 112 is oriented to allow blast air to cross second channel when initial, and other two valve 112a, 112b are oriented to close the inlet of two first passages.When the temperature of ternary catalyzing unit 14 reaches catalyzer and has begun to live the temperature of (light off), movement of valve 112a, 112b are to allow exhaust begin to flow through first passage and through supercooler 113, and correspondingly valve 112 moves to the position that the blast air through second channel is limited.As previously mentioned, allow heat from exhaust, to be recovered and to be used for heating to flow through the freezing mixture of the main cooling circuit of motor 10 like this, and have foregoing advantage.
In the normal process, when motor operates in lean mode following time under light or partial load condition, will the flow through temperature of exhaust of rare NOx trap 15 of hope remains in the limit that is rather narrow, and is 400 to 450 degrees centigrade scope as previously mentioned.
When operating under this condition, valve 112,112a and 112b or be that main shaft 120 rotates under the control of electronic control unit more accurately are to continuously change the blast air through supercooler 113, to obtain required temperature.Can guarantee like this: when motor 10 operates in lean mode following time, rare NOx trap 15 moves with peak efficiency.
When motor 10 stood height or complete loading condition, valve 112 moved under the control of electronic control unit, to close second channel, so that the cooling effect of cooler 13 is maximized.To make rare NOx trap 15 keep as far as possible coldly like this, still under this high load condition, the temperature of exhaust might surpass preferred 450 degrees centigrade temperature upper limit.
Yet as previously mentioned, this efficient for emission control system does not have and seriously influences, because this is the performance of ternary catalyzing unit 14, this performance is very important, because under this load, motor will operate in needs rare NOx trap 15 with outside the lean-burn operator scheme that reduces discharging.
With reference to figure 4, show the optional layout of first and second passages 216 and 217, to replace layout shown in Figure 3.In this case, second channel 217 is arranged in first passage 216, and as illustrated, establishes with one heart with respect to first passage 216.
That is to say that second channel 217 is through vent gas cooler 213.The single valve 212 that is connected to main shaft 120 is used to control the inlet of second channel 217.Operation as previously mentioned, valve 212 is used in exhaust through supercooler 213 and by the process of cold heating exhaust is turned to, prevent to cross second channel when motor operates in high capacity blast air of following time, and, be held in as much as possible near the Optimal Temperature that is beneficial to rare NOx trap performance/efficiency with temperature with exhaust when motor operates in flowing of lean mode change of following time process first passage under light or intermediate load condition.This structure has such advantage: it is relatively compact, and therefore is easy to be encapsulated in the motor vehicle.
With reference to figure 5, show emission control system with ternary catalyzing unit 14 and rare NOx trap 15, described ternary catalyzing unit 14 and rare NOx trap 15 are housed in the public housing 322, and described housing 322 has the outlet 18 of leading to the vent systems (not shown).Ternary catalyzing unit 14 is positioned at the upstream of rare NOx trap 15, thus exhaust process ternary catalyzing unit 14 before entering rare NOx trap 15.Housing 322 may be operably coupled to exhaust source by exhaust turbine supercharger and valve control wastegate passage 324 from the internal-combustion engine (not shown) at entry end, and wherein exhaust turbine supercharger and valve control wastegate passage 324 form the miscellaneous part of emission control systems.Motor may operate under the lean mode at least, and in this example, can operate under lean-burn, stoichiometric(al) burning and the dense combustion pattern.
Turbosupercharger has: shell 323, described shell define and are used for from the exhaust entrance passage 332 of motor to turbine 351 supply exhausts; May be operably coupled to the exhaust outlet 333 of housing 322; Air inlet 330 is used for air is conducted to compressor 350; And air outlet slit, be used for pressurized air being conducted to motor by the interstage cooler (not shown).In fact, exhaust entrance passage 332 is connected directly to the exhaust header (not shown) of motor.
Vent gas cooler 313 is arranged in wastegate passage 324, and wastegate passage 324 is to be formed by the independent pipeline that the position from turbine 351 upstreams extends to the position in turbine 351 downstreams.Vent gas cooler is connected to the main cooling circuit (not shown) of motor, and freezing mixture is drawn from described main cooling circuit, through vent gas cooler 313 and returning.
Exhaust gas by-pass valve 312 can be operated with to controlling through the blast air of first and second passages 316 and 317, in this case, exhaust gas by-pass valve 312 is fly valves, can operate a limit place that is used at stroke and close the inlet of first passage 316, and open the inlet of first passage 316 at the opposite limit place of stroke.Yet, should be appreciated that, also can use other control valve units.
Can use any device easily that valve 312 is activated, but in this example, air-operated actuator (not shown) is connected to exhaust gas by-pass valve 312.The air-operated actuator is connected to the air outlet slit 331 of turbosupercharger, and like this, when the pressure in the air outlet slit 331 surpassed predetermined pressure, valve 312 was opened to reduce the blast air through turbine 351.Yet, be appreciated that, other devices also can be used for controlling the motion of exhaust gas by-pass valve, and described valve can be subjected to the control of electronic control unit (not shown), and described electronic control unit is programmed and makes valve 312 open and close when the specific engines operating conditions exists.
Vent gas cooler 313 is set to be used for operating in the temperature of high capacity reduction of following time through the exhaust of rare NOx trap 15 at motor.
Control by using 312 pairs of blast airs of exhaust gas by-pass valve through first passage, thereby provide very simply device, wherein under low engine load conditions, all exhausts will be flow through turbine, thereby walk around vent gas cooler 313, but when motor moves under high capacity, exhaust gas by-pass valve 312 will be opened, thereby allow exhaust or at least some blast airs to cross vent gas cooler 313.In fact, when exhaust gas by-pass valve is opened fully, and motor operates in high capacity following time, and about 35 to 40% of total blast air will be through vent gas cooler 313.
In the improvement structure of this layout, exhaust gas by-pass valve 312 also will or come controlled according to the needs that help motor by cold heating according to the needs that cool off the exhaust of passing through rare NOx trap 15 not only by the pressure control in the air outlet slit 332.By this structure, electronic controller is programmed, be used for preventing from the air outlet slit 332 to produce the needs of overvoltage and if possible the temperature of rare NOx trap being remained on the basis of the needs in the predetermined temperature range position of control exhaust gas by-pass valve 312 considering.That is to say that exhaust gas by-pass valve is by electronic control unit controls, to open and close when the preset engine operating conditions exists.
Rankine system can be used in the design, to guarantee that it can be opened when exhaust gas by-pass valve need be opened with the pressure in the limit air outlet 332.
An advantage of this independent control is that after cold start-up under low ambient temperature, exhaust can flow out to vent gas cooler 313 with the heating of acceleration to motor, and improves the performance of operator cabin heater in the engine gets hotter process.
Another advantage of this layout is, in the lean-burn operating process of motor, exhaust gas by-pass valve 312 can be opened and closed, remain in the following temperature range or near this temperature with temperature with rare NOx trap 15, under this temperature, no matter whether the pressure in the air outlet slit 332 is high enough to open valve 312, rare NOx trap 15 can both be realized maximum operating characteristics.This will improve the emission performance of emission control system in the process of burning under lean mode.
In both cases, all has such advantage: only need a control valve that overvoltage release and exhaust cooling control are provided.
With reference to figure 6, show emission control system with ternary catalyzing unit 14 and rare NOx trap 15, described ternary catalyzing unit 14 and rare NOx trap 15 are housed in the public housing 322, and described housing 322 has the outlet 18 of leading to the vent systems (not shown).Ternary catalyzing unit 14 is positioned at the upstream of rare NOx trap 15, thus exhaust process ternary catalyzing unit 14 before entering rare NOx trap 15.Housing 322 may be operably coupled to exhaust source by exhaust turbine supercharger and valve control wastegate passage 324 from the internal-combustion engine (not shown) at entry end, and wherein exhaust turbine supercharger and valve control wastegate passage 324 form the miscellaneous part of emission control systems.Motor may operate under the lean mode at least, and in this example, can operate under lean-burn, stoichiometric(al) burning and the dense combustion pattern.
Turbosupercharger has: shell 323, described shell define and are used for from the exhaust entrance passage 332 of motor to turbine 351 supply exhausts; May be operably coupled to the exhaust outlet of housing 322; Air inlet 330 is used for air is conducted to compressor 350; And air outlet slit, be used for pressurized air being conducted to motor by the interstage cooler (not shown).In fact, exhaust entrance passage 332 is connected directly to the exhaust header (not shown) of motor.
Vent gas cooler 413 is arranged in the downstream of turbine 351 and at the first passage that is connected to outlet passage from turbine 351, bypass valve 412 is used for the blast air through second channel 417 is controlled, described second channel is provided for making exhaust to flow to outlet 18 from turbine 351, and without vent gas cooler 413.
Vent gas cooler 413 is connected to the main cooling circuit (not shown) of motor, and freezing mixture is drawn from main cooling circuit, through vent gas cooler 413 and returning.
In this example, exhaust gas by-pass valve 312 and bypass valve 412 are all formed by fly valve, described fly valve can operate the inlet that is used for cutting out each passage 324,417, wherein they are installed in a limit place of stroke, and can operate and be used for opening at another opposite limit place of stroke the inlet of each passage 324,417.Yet, be appreciated that and can use other valve arrangements.
Can use any device easily that exhaust gas by-pass valve and bypass valve 312,412 are activated, but in this example, the vacuum actuator (not shown) of being controlled by the electronic control unit (not shown) is connected to each valve 312,412, and valve 312,412 is by electronic control unit controls, to open and close when the preset engine operating conditions exists.
Vent gas cooler 413 is set, is used for operating in high capacity following time and reduces temperature, and operate in lean mode following time when motor, the temperature in rare NOx trap 15 is remained between the predetermined limits through the exhaust of rare NOx trap 15 at motor.
Operate as followsly, after cold start-up, exhaust gas by-pass valve 312 and bypass valve 412 are all opened, thereby allow the exhaust of heat unhinderedly to flow to ternary catalyzing unit 14 and rare NOx trap 15.So just quickened the heating of parts, and guaranteed that ternary catalyzing unit 14 plays (light-off) alive as soon as possible after engine start, minimized with discharging with motor.After short initial time, enough heats will be passed to ternary catalyzing unit 14, work to guarantee it, and bypass valve 412 be closed simultaneously, so that turn to vent gas cooler 413 through the exhaust of passage 460.The heat that extracts from exhaust is used to reduce the heating time of motor, and the performance of improving the operator cabin heater.One of ordinary skill in the art will appreciate that, when motor not at its normal operating temperature or when keeping off its normal operating temperature, discharging and fuel economy all can be subjected to negative effect.
Utilize electronic control unit that two valves 312,412 are controlled, make and to have reached or during when motor near its normal operating temperature, the 3rd control mode is used, wherein exhaust gas by-pass valve 312 is controlled with the air pressure in the limit air outlet 331, and bypass valve 412 is used, so that motor operate in light or partial load under and in lean mode the time, the temperature through the exhaust of rare NOx trap 15 is controlled.
Yet, if being detected as, motor operates under the high capacity, bypass valve 412 normally cuts out so, and exhaust gas by-pass valve 312 normally opened, and guaranteeing the cooling maximization of exhaust, thereby the degeneration of rare NOx trap 15 is minimized.
By using two valves that wastegate passage and second channel are carried out individually, control independently, can realize than better control embodiment illustrated in fig. 5, but the cost and the system complexity of this structure are all higher.
Although in two embodiments shown in Fig. 5 and 6, the wastegate passage is illustrated as independent pipeline, be appreciated that it can form the part of turbosupercharger shell.
Therefore, generally speaking, the invention provides a kind of ternary catalyzing unit and rare NOx trap that is encapsulated in the single housing, described housing can be by utilizing upstream exhaust gas cooler, and closely be connected to exhaust outlet from motor.
One of ordinary skill in the art will appreciate that, although described the present invention in the mode of example with reference to a plurality of specific embodiments, yet the invention is not restricted to these embodiments, under the situation that does not depart from scope of the present invention, can carry out various changes and change the disclosed embodiments.
Claims (7)
1. emission control system that is used for internal-combustion engine, wherein internal-combustion engine can operate under several combustion modes, a kind of combustion mode in described several combustion mode is a lean mode, and described device comprises: housing, and described housing has inlet, be used in use receiving exhaust from motor, and described housing has outlet, and in use treated exhaust is flowed out from described outlet, wherein, ternary catalyzing unit and rare NOx trap are positioned at housing
Wherein, described emission control system also comprises: exhaust turbine supercharger, and described exhaust turbine supercharger has housing, is used to hold compressor and turbine; And valve control wastegate passage, being used for walking around selectively the turbine of turbosupercharger, its middle shell is provided for receiving the exhaust from turbosupercharger and wastegate passage,
Wherein, vent gas cooler is installed in the wastegate passage.
2. device according to claim 1, wherein, vent gas cooler is installed in the downstream of the turbine of turbosupercharger.
3. device according to claim 2 wherein, is provided with at least one bypass valve, is used in use the blast air through vent gas cooler being controlled.
4. according to claim 2 or 3 described devices, wherein, passage is set, in use to walk around vent gas cooler selectively.
5. according to the described device of the claim 4 that is subordinated to claim 3, wherein, bypass valve is provided for the blast air through bypass passageways is controlled.
6. according to claim 3 or 5 described devices, wherein, described bypass valve is provided for guaranteeing operating in high capacity following time at motor, and almost all vent gas cooler is all flow through in exhausts.
7. according to claim 3 or 5 described devices, wherein, described bypass valve is controlled, makes at least to operate in lean mode following time at motor, and the temperature of the exhaust of rare NOx trap of flowing through is controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100819432A CN1891991B (en) | 2005-07-08 | 2005-07-08 | Exhaust-control device of engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100819432A CN1891991B (en) | 2005-07-08 | 2005-07-08 | Exhaust-control device of engine |
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| CN1891991A CN1891991A (en) | 2007-01-10 |
| CN1891991B true CN1891991B (en) | 2010-08-11 |
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| CN2005100819432A Expired - Fee Related CN1891991B (en) | 2005-07-08 | 2005-07-08 | Exhaust-control device of engine |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT512232B1 (en) * | 2011-11-28 | 2014-01-15 | Steyr Motors Gmbh | POSITIONING DEVICE FOR A TURBOCHARGER UNIT |
| JP2015500935A (en) * | 2011-12-01 | 2015-01-08 | ユミコア・アクチエンゲゼルシャフト・ウント・コムパニー・コマンディットゲゼルシャフトＵｍｉｃｏｒｅ ＡＧ ＆ Ｃｏ．ＫＧ | Operation method of exhaust gas purification system |
| CN109611181A (en) * | 2019-02-01 | 2019-04-12 | 联合汽车电子有限公司 | It is a kind of can partition heating ternary catalyzing unit, partition heating system and method |
| CN114109569B (en) * | 2020-09-01 | 2023-01-31 | 长城汽车股份有限公司 | Exhaust purification apparatus and method for preventing non-restorability after sulfur poisoning of LNT region |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1152140A2 (en) * | 2000-05-02 | 2001-11-07 | Nissan Motor Co., Ltd. | Exhaust gas purifying system of internal combustion engine |
| US20030033801A1 (en) * | 2001-08-17 | 2003-02-20 | Benteler Automobil Technik Gmbh & Co. Kg | Exhaust system for a motor vehicle |
-
2005
- 2005-07-08 CN CN2005100819432A patent/CN1891991B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1152140A2 (en) * | 2000-05-02 | 2001-11-07 | Nissan Motor Co., Ltd. | Exhaust gas purifying system of internal combustion engine |
| US20030033801A1 (en) * | 2001-08-17 | 2003-02-20 | Benteler Automobil Technik Gmbh & Co. Kg | Exhaust system for a motor vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1891991A (en) | 2007-01-10 |
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