CN203925695U - The control system of engine exhaust temperature - Google Patents
The control system of engine exhaust temperature Download PDFInfo
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- CN203925695U CN203925695U CN201420112219.6U CN201420112219U CN203925695U CN 203925695 U CN203925695 U CN 203925695U CN 201420112219 U CN201420112219 U CN 201420112219U CN 203925695 U CN203925695 U CN 203925695U
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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
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- Y02T10/40—Engine management systems
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Abstract
The utility model provides a kind of control system of engine exhaust temperature, wherein, described control system comprises ECU control unit, motor, intercooler, exhaust treatment system, parallel with described intercooler, for being connected the suction tude of described motor and the bypass line of described cylinder, on described bypass line or the Fen Kouchu of described intercooler and described bypass line be provided with bypass valve, described bypass valve is for the air flow in the suction tude of control engine; Described ECU control unit is used for obtaining described DPF upstream and downstream pressure reduction and described DOC upstream temperature, whether the amount that judges the particulate matter carrying in DPF grain catcher according to the described DPF upstream and downstream pressure reduction getting surpasses predetermined threshold value, if, according to the DOC upstream temperature obtaining, control the aperture of bypass valve, air flow in control engine suction tude, and then the delivery temperature of control engine.
Description
Technical field
The utility model relates to engine exhaust emission technical field, relates in particular to a kind of control system of engine exhaust temperature.
Background technique
In order to reduce the discharge of motor, protection of the environment, just the exhaust of being discharged by waste pipe need to can be discharged in environment through the vent gas treatment process of exhaust treatment system.
In the exhaust treatment system of motor machine, the height of the delivery temperature of motor is processed ground to the exhaust emissions of motor and thoroughly whether is played vital effect.This is because in the exhaust emissions processing procedure of motor, only, after delivery temperature reaches uniform temperature, exhaust treatment system could be processed exhaust.Temperature is too low, and vent gas treatment efficiency is lower or cannot carry out vent gas treatment.For example, in SCR(Selective Catalytic Reduction, selective catalytic reduction) in system, when the temperature of the exhaust of SCR upstream temperature is during lower than 200 ℃, NO and NH
3transformation efficiency lower.
In addition, in order to catch the particle emission in tail gas, DPF(Diesel Particulate Filter is also installed in exhaust treatment system) grain catcher, this DPF grain catcher is a kind of porcelain filter, and it catches before particulate emission material in tail gas can being entered to atmosphere.This DPF grain catcher is a kind of capable of regeneration catcher, after particle emission runs up to certain level, by its inner particulate matter of burning, realizes regeneration.The regeneration method of DPF grain catcher is divided into initiative regeneration and passive regeneration.The temperature that initiative regeneration need to enter the exhaust of DPF grain catcher reaches certain value just can carry out, and the delivery temperature and the efficiency of passive regeneration follows up in DPF grain catcher is relevant.
Therefore,, in order to improve vent gas treatment efficiency or to realize the regeneration of DPF grain catcher, need the delivery temperature of control engine.
Model utility content
In view of this, the control system that a kind of engine exhaust temperature is provided of the present utility model, to improve vent gas treatment efficiency or to realize the regeneration of DPF grain catcher.
In order to solve the problems of the technologies described above, the utility model has adopted following technological scheme:
A control system for engine exhaust temperature, comprises, ECU control unit, motor, intercooler, exhaust treatment system; Wherein, described motor comprises suction tude and outlet pipe, and described exhaust treatment system comprises DOC device and DPF grain catcher;
Described intercooler connects suction tude and the cylinder of described motor, and described waste pipe is connected with described exhaust treatment system;
Described control system also comprises, parallel with described intercooler, for being connected the suction tude of described motor and the bypass line of described cylinder, on described bypass line or the Fen Kouchu of described intercooler and described bypass line be provided with bypass valve, described bypass valve is for the air flow in the suction tude of control engine;
Described ECU control unit is used for obtaining described DPF upstream and downstream pressure reduction and described DOC upstream temperature, whether the amount that judges the particulate matter carrying in DPF grain catcher according to the described DPF upstream and downstream pressure reduction getting surpasses predetermined threshold value, if, according to the DOC upstream temperature obtaining, control the aperture of bypass valve, air flow in control engine suction tude, and then the delivery temperature of control engine.
Preferably, described exhaust treatment system also comprises SCR catalyst converter, and described SCR catalyst converter is positioned at the downstream of described DPF grain catcher.
Preferably, described ECU control unit, also for obtaining SCR upstream temperature, judges that whether described SCR upstream temperature is lower than preset temperature, if, according to described SCR upstream temperature, control the aperture of bypass valve, the air flow in control engine suction tude, and then the delivery temperature of control engine.
Preferably, described control system also comprises, is arranged at the fuel nozzle of described DOC device upstream.
Preferably, when described ECU control unit does not also surpass predetermined threshold value for the amount of the particulate matter that carries in described DPF grain catcher, control described bypass valve and close, make air in the engine air inlet tube intercooler of all flowing through enter cylinder and fuel oil mixed combustion.
Preferably, described ECU control unit also, for when described SCR upstream temperature is during higher than preset temperature, is controlled described bypass valve and is closed, and makes air in the engine air inlet tube intercooler of all flowing through enter cylinder and fuel oil mixed combustion.
The utlity model has following beneficial effect:
The control system of the engine exhaust that the utility model provides, comprise the bypass line parallel with intercooler, the suction tude of this bypass line connecting engine and cylinder, and be provided with a bypass valve on the bypass line of this increase or at the Fen Kouchu of bypass line and intercooler.When the aperture of bypass valve is zero, the air of the suction tude intercooler of all flowing through enters motor, when the aperture of bypass valve is 100%, the air of the suction tude bypass line of all flowing through enters motor, when the aperture of bypass valve is between 0～100%, the air portion of suction tude divides the intercooler of the flowing through bypass line of partly flowing through to enter motor.Therefore,, by controlling the flow direction of the air of the aperture of bypass valve in can control engine suction tude, thereby entering cylinder through intercooler and/or bypass line, the air stream in control engine suction tude burns.Because air after intercooler is cooled, heat loss, and through the not loss of heat of the air of bypass line, thereby by the air flow in control suction tude the delivery temperature of the motor after can control combustion.Temperature receives that the engine exhaust of control enters the regeneration that can improve the efficiency of vent gas treatment after exhaust treatment system or can be used in DPF grain catcher.
Accompanying drawing explanation
For the utility model embodiment's specific implementation is clearly described, the accompanying drawing of using is carried out to brief description below when describing embodiment.Apparently, these accompanying drawings are only a part of accompanying drawings of the utility model embodiment, and those of ordinary skills, not paying under the prerequisite of creative work, can also obtain other accompanying drawing.
Fig. 1 is the control system structural representation of the engine exhaust temperature that provides of the utility model embodiment one;
Fig. 2 is the structural representation of the initiative regeneration system of the DPF grain catcher that provides of the utility model embodiment;
Fig. 3 is the controlling method schematic flow sheet of the engine exhaust temperature that provides of the utility model embodiment two;
Fig. 4 is the controlling method schematic flow sheet of the engine exhaust temperature that provides of the utility model embodiment three.
Embodiment
In order to make the technical solution of the utility model more clear understandable, below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated.
Embodiment one
Fig. 1 is the control system structural representation of the engine exhaust temperature described in the utility model embodiment one, below in conjunction with Fig. 1, the control system of the engine exhaust temperature to described in the utility model embodiment one is described in detail.
As shown in Figure 1, the control system of this engine exhaust temperature comprises, ECU control unit 1, motor 2, intercooler 3 and exhaust treatment system 4, wherein, motor 2 comprises suction tude 21 and outlet pipe 22, the suction tude 21 of intercooler 3 connecting engines 2 and motor 2, the air in suction tude 21 is through entering the cylinder of motor 2 again after intercooler 3 cooling like this.In order to improve density of the induced air, the raising air inflow of air, this control system also comprises the turbosupercharger 5 being arranged between suction tude 21 and intercooler 3.Enter like this air of suction tude 21 through after turbosupercharger 5 superchargings, can improve air inflow and the density of the induced air of motor.
In order to increase the passage of the air that enters motor, control system described in the utility model embodiment also comprises the bypass line 6 parallel with intercooler 3, this bypass line 6 is connected between turbosupercharger 5 and motor 2, therefore, this bypass line 6 can be used as the path that air in suction tude 21 enters motor 2.Further, in order to control the flow direction of suction tude, at the Fen Kouchu of this bypass line 6 and intercooler 3, be provided with a bypass valve 7.By controlling the aperture of bypass valve 7, can control air in suction tude 21 intercooler 3 bypass line 6 of still flowing through of whether flowing through and still both flow through.Particularly, when the aperture of bypass valve 7 is zero, the air of suction tude 21 intercooler 3 of all flowing through enters motor 2, when the aperture of bypass valve 7 is 100%, the air of suction tude 21 bypass line 6 of all flowing through enters motor 2, when the aperture of bypass valve 7 is between 0～100%, the air portion of suction tude 21 divides intercooler 3 parts of the flowing through bypass line 6 of flowing through to enter motor 2.When the aperture of bypass valve 7 is not 0, air in suction tude 21 enters motor through turbosupercharger 5 bypass line 6 of partly or entirely flowing through, because the air of the bypass line 6 of flowing through is not through supercooling, its heat is loss not, higher compared to the temperature of air that enters motor through intercooler, the higher air of this temperature with in cylinder with fuel oil mixed combustion after the temperature of the gas that produces also higher.The delivery temperature that is motor is higher.Therefore, the setting by the bypass line 6 in the utility model control system can improve the delivery temperature of motor by controlling the aperture of bypass valve 7.
The delivery temperature that temperature is improved, after turbosupercharger 5 enters exhaust treatment system 4, is conducive to improve the treatment effect of exhaust treatment system.When utilizing tail gas to carry out the regeneration of DPF grain catcher, be also conducive to tail gas and reach the DPF grain catcher required temperature of regenerating.
In the utility model embodiment, exhaust treatment system 4 can comprise DOC device 41 and DPF grain catcher 42, in order to improve the treatment effect of tail gas, reduces the discharge amount of tail gas, and this exhaust treatment system 4 can also comprise SCR catalyst converter 43.When exhaust treatment system 4 comprises DOC device 41, DPF grain catcher 42 and SCR catalyst converter 43, its erection sequence is the upstream that DOC device 41 is positioned at DPF grain catcher 42, and DPF grain catcher is positioned at the upstream of SCR catalyst converter 43.The tail gas of being discharged by motor like this, is just discharged in atmosphere successively after DOC device 41, DPF grain catcher 42 and SCR catalyst converter are processed.
In the present embodiment, in order to detect the temperature of DOC device 41 upstreams, the temperature of the temperature of DPF grain catcher 42 upstreams, SCR catalyst converter 43 upstreams DOC upstream temperature sensor 8 is installed in the upstream of DOC device 41 respectively, DPF upstream catcher 9 is installed in the upstream of DPF grain catcher 42, in the upstream of SCR catalyst converter, SCR upstream temperature sensor 10 is installed.In order to detect the pressure reduction of DPF grain catcher upstream and downstream, DPF upstream and downstream differential pressure pickup 11 is also installed.
In order to detect the temperature in SCR catalyst converter downstream, this control system also comprises the SCR downstream temperature sensor 12 for detection of SCR catalyst converter 43 downstream temperature.
As an embodiment of the present utility model, control system described above can be for the regeneration of DPF grain catcher.Now, ECU control unit can be specially:
Temperature signal, the temperature signal of DPF upstream temperature sensor 9 collections, the temperature signal of SCR catalyst converter 43 upstream sensors 10 collections that ECU control unit 1 can gather for obtaining DOC upstream temperature sensor 8, this ECU unit 1 is also for obtaining the pressure difference signal of the differential pressure pickup 11 of DPF grain catcher 42 upstream and downstream.ECU unit 1 judges according to the pressure reduction of DPF grain catcher 42 upstream and downstream that get whether the amount of the particulate matter of carrying in DPF grain catcher surpasses predetermined threshold value, if so, ECU controls the aperture of bypass valve 7 according to the temperature signal of DOC device 41 upstreams that get.According to the aperture of this bypass valve 7, make the air stream in engine air inlet tube finally enter cylinder and fuel oil mixed combustion through intercooler 3 and/or bypass line 6, the temperature of the engine exhaust after burning can improve, thereby the temperature that exhaust is entered after described DPF grain catcher can reach the temperature that DPF grain catcher is regenerated.
Further, when ECU control unit can also not surpass predetermined threshold value for the amount of the particulate matter that carries in DPF grain catcher, control bypass valve 7 and close, make air in the engine air inlet tube described intercooler of all flowing through enter cylinder and fuel oil mixed combustion.
The regeneration of DPF grain catcher comprises initiative regeneration and two kinds of methods of passive regeneration, and initiative regeneration refers to and utilizes outside energy to improve the temperature in catcher, makes particulate ignition.When the temperature in DPF grain catcher reaches 300 ℃, the particulate matter of deposition will oxidizing fire, if temperature does not reach 300 ℃, too much sediments will blocking filter, this is just to utilize outside resources (for example change of electric heater, burner or engine operating condition) to improve the temperature in DPF, makes particulate matter oxidizing fire.The initiative regeneration system schematic of DPF grain catcher is as shown in 2.Wherein, T1 is DOC upstream temperature, and T2 is DPF grain catcher upstream temperature, and Δ P is the upstream and downstream pressure reduction of DPF grain catcher, and T3 is DPF grain catcher downstream temperature.
Passive regeneration refers to the kindling temperature of utilizing fuel oil additive or catalyzer to reduce particulate, make particulate can be at normal diesel exhaust gas temperature ignition.Additive (cerium, iron and strontium) will add in fuel oil in certain proportion, and additive too much impact is little, if but very few, will cause regeneration delays or regeneration temperature to raise.
As another embodiment of the present utility model, control system described above can also be for improving vent gas treatment efficiency.Now ECU control unit can be specially:
ECU control unit 1 is for obtaining the temperature signal of the SCR upstream of SCR catalyst converter upstream sensor 10 collections, judge that whether the temperature of this SCR upstream is lower than preset temperature, if so, ECU control unit 1 is according to the aperture of the SCR upstream temperature SC sigmal control bypass valve 7 getting.According to the aperture of this bypass valve 7, make the air stream in engine air inlet tube enter cylinder and fuel oil mixed combustion through intercooler and/or bypass line, thereby the temperature of the engine exhaust after burning is improved, thereby the delivery temperature that makes to enter in SCR catalyst converter can reach the temperature that SCR catalyst converter carries out reducibility catalytic reaction.
Further, ECU control unit also, for when SCR upstream temperature is during higher than preset temperature, is controlled bypass valve and is closed, and makes air in the engine air inlet tube described intercooler of all flowing through enter cylinder and fuel oil mixed combustion.
In the utility model embodiment, DOC(Diesel Oxidation Catalysis, catalytic oxidation) be on honeycomb ceramic carrier noble metal-coating catalyzer as Pt etc., its objective is in order to reduce the chemical reaction activation energy of hydrocarbon, hydrocarbon and oxysulfide in diesel engine vent gas, make the oxygen in these substances and tail gas at lower temperature, carry out oxidation reaction and finally be converted into CO2 and H2O.DOC device is that oxidizing catalytic converter does not need regenerative system and control gear, has feature simple in structure, good reliability, on Modern Small diesel engine, has obtained certain application.
Reaction principle in DOC device is as follows:
2NO+O
2→2NO
2；
2CO+O
2→CO
2；
2CH
2+O
2→CO
2+H
2O。
DPF grain catcher is a kind of porcelain filter being arranged in diesel engine emissions system, and it enters atmosphere before by its seizure by the particulate emission material in tail gas.Described particulate emission material major part is that the molecule of carbon and carbide forms.DPF grain catcher is the device that being used in engine aftertreatment system processed particle emission, after running up to certain level, particle emission needs to regenerate, by the particulate matter burning catching, to produce harmless CO2 emission in atmosphere.
The basic functional principle of DPF grain catcher is as follows:
When diesel exhaust gas flows through DOC device, under the temperature conditions of 200-600 ℃, oxycarbide and hydrocarbon are not all oxidized to CO
2and H
2o, NO is converted to NO simultaneously
2.Exhaust is from DOC device out enters DPF grain catcher, and particulate is wherein disregarded in the filter core of filter, remaining clean being discharged in atmosphere, and the arresting efficiency of DPF grain catcher can reach more than 90%.
NO2 has very strong oxidability to the particle being captured, and utilizes the NO2 producing in DOC remove the particulate in DPF grain catcher and generate CO as oxygenant
2, and NO
2be reduced into again NO, thereby reach the object of removing particulate.
Reaction principle in DPF is as follows:
2C+2NO
2+O
2→2CO
2+2NO。
The control system of the engine exhaust temperature that above-described embodiment one provides, utilize the bypass line 6 parallel with intercooler, and by controlling the aperture of bypass valve 7, thereby the air flow in control engine suction tude, thereby can carry out the air flow in control engine suction tude according to the height of DOC upstream temperature or SCR upstream temperature, thereby whether the air in control suction tude is cooled, and then the delivery temperature of the motor after control combustion.Therefore, the control system that the utility model embodiment provides, can realize the control to engine exhaust temperature, is conducive to the regeneration of DPF grain catcher or the transformation efficiency of SCR catalytic reaction.
The control system of the engine exhaust temperature providing in conjunction with the utility model embodiment one, the utility model also provides the controlling method embodiment of engine exhaust temperature.The controlling method of this engine exhaust temperature can be for the regeneration of DPF grain catcher.Specifically referring to embodiment two.
Embodiment two
Fig. 3 is the controlling method schematic flow sheet of the engine exhaust temperature shown in the utility model embodiment two.The controlling method of the engine exhaust temperature that as shown in Figure 3, the utility model embodiment provides comprises the following steps:
S31, DPF upstream and downstream differential pressure pickup detect the pressure reduction of DPF upstream and downstream:
DPF upstream and downstream differential pressure transducer detects the pressure reduction of DPF upstream and downstream.
S32, ECU control unit obtain the pressure reduction of the DPF upstream and downstream that DPF upstream and downstream differential pressure pickup detects:
The function of utilizing ECU control unit in control system and each sensor in control system (comprising DPF grain catcher upstream and downstream differential pressure pickup, DOC upstream temperature sensor, SCR upstream temperature sensor) to carry out signal transmission, the ECU control unit in control system obtains the pressure difference signal of the DPF upstream and downstream that DPF upstream and downstream differential pressure pickup detects.Like this, ECU control unit has just got the pressure reduction of DPF upstream and downstream.
S33, ECU control unit judge according to the pressure reduction of DPF grain catcher upstream and downstream whether the amount of the particulate matter carrying in DPF grain catcher surpasses predetermined threshold value:
It should be noted that, because the magnitude of pressure differential of DPF grain catcher upstream and downstream is relevant with the number of the particulate matter carrying in DPF grain catcher.When the pressure reduction of DPF grain catcher upstream and downstream is larger, illustrate that the particulate matter of carrying in DPF grain catcher is more, when the pressure reduction of DPF grain catcher upstream and downstream hour, illustrate that the particulate matter carrying in DPF grain catcher is less.
Therefore,, in order can to guarantee the particle filtering efficiency of DPF grain catcher and can to make DPF grain catcher regenerate in time, can preset a predetermined threshold value of the particulate matter amount of carrying in DPF grain catcher.When in DPF grain catcher, the amount of the particulate matter of carrying surpasses this predetermined threshold value, show that DPF grain catcher need to regenerate, when the amount of the particulate matter carrying in DPF grain catcher does not surpass predetermined threshold value, show that DPF grain catcher is without regenerating, can proceed the filtration of particulate matter and remove.
Therefore,, in this step, ECU control unit judges according to the pressure reduction of DPF grain catcher upstream and downstream whether the amount of the particulate matter carrying in DPF grain catcher surpasses predetermined threshold value, to determine whether to carry out the regeneration of DPF grain catcher.
If judgment result is that to be, in DPF grain catcher, the amount of the particulate matter of carrying surpasses predetermined threshold value, determines the regeneration of carrying out DPF grain catcher, execution step S34.
If the determination result is NO, the amount that in DPF grain catcher, the particle of carrying goes does not surpass predetermined threshold value, determines and does not carry out the regeneration of DPF grain catcher, execution step S36.
S34, ECU control unit are controlled the aperture of bypass valve according to the temperature of the DOC upstream getting;
As mentioned above, ECU control unit can carry out signal transmission with each sensor, and therefore, ECU control unit can get the temperature signal that DOC upstream temperature sensor gathers.
In the utility model embodiment, in exhaust treatment system, at least comprise DOC device and DPF grain catcher.And DOC device is positioned at the upstream of DPF grain catcher.Like this, the exhaust that motor is discharged is removed most of hydrocarbon, hydrocarbon and oxygen sulfur compound in exhaust after via DOC oxidation catalysis, and meanwhile, after DOC reaction, delivery temperature has also improved, and is conducive to the regeneration of DPF grain catcher.
In the utility model embodiment, in order to improve the delivery temperature of motor, by the air flow in control engine suction tude, realize.Particularly, by controlling the aperture of bypass valve, can realize the air flow in control engine suction tude.
Can reach suitable dpf regeneration temperature when making the delivery temperature of motor reach in DPF grain catcher, according to the temperature of the DOC upstream detecting, control the aperture of bypass valve, thus the flow direction of the air in control engine suction tude.Particularly, when the temperature of DOC upstream is higher, the aperture of controlling bypass valve is less, makes the air of major part enter cylinder by intercooler; When the temperature of DOC upstream is lower, the aperture of controlling bypass valve is larger, makes the air of smaller portions enter cylinder by intercooler.
S35, according to the aperture of described bypass valve, air stream in engine air inlet tube enters cylinder and fuel oil mixed combustion through intercooler and/or bypass line, thereby make the engine exhaust temperature after burning controlled, the temperature that the controlled engine exhaust of temperature enters into after DPF grain catcher can reach the temperature that DPF grain catcher is regenerated.
When the aperture of bypass valve is 0%, air in the engine air inlet tube intercooler of all flowing through carries out after cooling entering cylinder and fuel oil mixed combustion again, due to before entering cylinder, air is cooled, so the temperature of the motor exhaust producing after burning is also relatively low.
When the aperture of bypass valve is 100%, air in the engine air inlet tube bypass line of all flowing through just enters cylinder and fuel oil mixed combustion without cooling, due to before entering cylinder, air is not cooled, so the temperature of the motor exhaust producing after burning is relatively high.
When the aperture of bypass valve is between 1～100%, part air stream in engine air inlet tube is through intercooler, part air stream is through bypass line, and part air enters cylinder and fuel oil mixed combustion after being cooled, and the engine exhaust temperature obtaining is thus between the two above-mentioned.
Therefore, by the aperture of bypass valve, control the air flow in suction tude, get final product the temperature of control engine exhaust, thereby make the temperature of engine exhaust after entering into DPF grain catcher can reach the temperature that DPF grain catcher is regenerated.
It should be noted that, the regeneration of DPF grain catcher comprises initiative regeneration and passive regeneration.
When DPF grain catcher be regenerated as initiative regeneration time, generally to make DOC upstream temperature reach more than 250～280 ℃, the temperature that just can make exhaust enter into DPF grain catcher reaches more than 550 ℃, DPF grain catcher just can carry out initiative regeneration like this.When DPF grain catcher carries out initiative regeneration, generally at the diesel fuel nozzle of DOC device upstream, in the outlet pipe before DOC device, spray into diesel oil by ECU control unit opening installation, to improve delivery temperature.
When DPF grain catcher be regenerated as passive regeneration time, the temperature that exhaust enters after DPF grain catcher reaches between 300 to 400 ℃, could effectively carry out passive regeneration.Therefore,, when passive regeneration, also need to control DOC upstream temperature.
S36, ECU control unit control bypass valve and close, and make air in the engine air inlet tube intercooler of all flowing through enter cylinder and fuel oil mixed combustion.
If DPF grain catcher is when regenerating, ECU control unit is controlled bypass valve and is closed, and makes air in the engine air inlet tube intercooler of all flowing through enter cylinder and oil inflame.
The controlling method of the engine exhaust temperature that the above provides for the utility model embodiment two.But the operation of motor is a continuous operation process.Therefore, controlling method described above can be a plurality of cyclic processes.After carrying out a dpf regeneration process, can again obtain the pressure reduction of DPF grain catcher upstream and downstream, re-start once cyclic process described above, until engine stop work.
Controlling method described in above-described embodiment two is for the regeneration of DPF grain catcher.In addition the controlling method that, the utility model embodiment provides can also be for improving the vent gas treatment efficiency of exhaust treatment system.Particularly, referring to embodiment three.
Embodiment three
Fig. 4 is the controlling method schematic flow sheet of the engine exhaust temperature described in the utility model embodiment three.The controlling method of the engine exhaust temperature that as shown in Figure 4, the utility model embodiment provides comprises the following steps:
S41 detects the temperature of SCR upstream:
SCR upstream temperature sensor detects the temperature of SCR upstream.
S42, ECU control unit judge that the temperature of described SCR upstream is whether lower than preset temperature:
It should be noted that, when vehicle long-time running is between low temperature low load region, the delivery temperature of motor is lower, and SCR catalyst converter is in off position, and nitrogen oxygen discharge is now higher.In order to reduce the discharge of oxynitrides, make motor exhaust process through SCR.Thereby, when the delivery temperature of motor is during lower than a certain temperature, just need to improve its temperature, make it reach the temperature that SCR processes.In the present embodiment, can preset a temperature value, after lower than this preset temperature, take measures to improve delivery temperature.
Particularly, in this step, ECU control unit judges that whether the temperature of described SCR upstream is lower than preset temperature, to determine whether to take measures to improve the delivery temperature of motor.If so, determine the delivery temperature of taking measures to improve motor, execution step S43, if not, determines the delivery temperature of not taking measures to improve motor, execution step S45.
It should be noted that, when SCR processes, delivery temperature just can not be carried out work during lower than 200 ℃, so the preset temperature described in the utility model embodiment can be 200 ℃.
S43, ECU control unit are controlled the aperture of bypass valve according to the SCR upstream temperature getting:
In the utility model embodiment, in order to improve the delivery temperature of motor, by the air flow in control engine suction tude, realize.Particularly, by controlling the aperture of bypass valve, can realize the air flow in control engine suction tude.
Temperature when making the delivery temperature of motor reach SCR catalyst converter generation catalytic reaction, ECU control unit is according to the air flow in the temperature control engine suction tude of the SCR upstream getting.Particularly, the temperature of the SCR upstream getting is lower, and the aperture of bypass valve is larger.The aperture of bypass valve is larger, and cooled air is not many for the bypass line of flowing through, and the intake temperature that enters like this cylinder is higher, thereby the temperature of the exhaust producing after making to burn is also higher.
S44 is according to the aperture of described bypass valve, air stream in engine air inlet tube enters cylinder and fuel oil mixed combustion through intercooler and/or bypass line, thereby make the engine exhaust temperature after burning controlled, the temperature that the controlled engine exhaust of temperature enters into after SCR catalyst converter can reach the temperature that SCR catalyst converter carries out reducibility catalytic reaction.
Step S35 with embodiment two is identical, according to the aperture of bypass valve, air in engine air inlet tube flows to intercooler and/or bypass line enters cylinder and fuel oil mixed combustion, thereby make the engine exhaust temperature after burning controlled, the temperature that the controlled engine exhaust of temperature is entered into after SCR catalyst converter can reach the temperature that SCR catalyst converter carries out reducibility catalytic reaction.
S45, ECU control unit control bypass valve and close, and make air in the engine air inlet tube intercooler of all flowing through enter cylinder and then mixed combustion.
When determining that while not needing to improve engine exhaust temperature, ECU control unit is controlled bypass valve and closed, make air in the engine air inlet tube intercooler of all flowing through enter cylinder and then mixed combustion.
The controlling method of the engine exhaust temperature that the above provides for the utility model embodiment three, and this controlling method is for improving the vent gas treatment efficiency of engines tail gas processing system.More particularly, by improving the delivery temperature of motor, make its suitable temperature that reaches SCR catalyst converter catalytic reaction, thereby improve the transformation efficiency of SCR catalyst converter, reduced the exhaust emissions of motor, be conducive to protection of the environment.
The controlling method of the engine exhaust temperature that the utility model provides, be not limited to DPF initiative regeneration system and SCR catalysis system, the raising method of the engine exhaust temperature that in fact, the utility model provides goes for any situation that needs to control or improve engine exhaust temperature.
The above is only preferred embodiment of the present utility model, not the utility model is done to any pro forma restriction.Although the utility model discloses as above with preferred embodiment, yet not in order to limit the utility model.Any those of ordinary skill in the art, do not departing from technical solutions of the utility model scope situation, all can utilize method and the technology contents of above-mentioned announcement to make many possible changes and modification to technical solutions of the utility model, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not depart from technical solutions of the utility model,, all still belongs in the scope of technical solutions of the utility model protection any simple modification made for any of the above embodiments, equivalent variations and modification according to technical spirit of the present utility model.
Claims (6)
1. a control system for engine exhaust temperature, is characterized in that, comprises ECU control unit, motor, intercooler, exhaust treatment system; Wherein, described motor comprises suction tude and outlet pipe, and described exhaust treatment system comprises DOC device and DPF grain catcher;
Described intercooler connects suction tude and the cylinder of described motor, and described waste pipe is connected with described exhaust treatment system;
Described control system also comprises, parallel with described intercooler, for being connected the suction tude of described motor and the bypass line of described cylinder, on described bypass line or the Fen Kouchu of described intercooler and described bypass line be provided with bypass valve, described bypass valve is for the air flow in the suction tude of control engine;
Described ECU control unit is used for obtaining described DPF upstream and downstream pressure reduction and described DOC upstream temperature, whether the amount that judges the particulate matter carrying in DPF grain catcher according to the described DPF upstream and downstream pressure reduction getting surpasses predetermined threshold value, if, according to the DOC upstream temperature obtaining, control the aperture of bypass valve, air flow in control engine suction tude, and then the delivery temperature of control engine.
2. control system according to claim 1, is characterized in that, described exhaust treatment system also comprises SCR catalyst converter, and described SCR catalyst converter is positioned at the downstream of described DPF grain catcher.
3. control system according to claim 2, it is characterized in that, described ECU control unit is also for obtaining SCR upstream temperature, judge that whether described SCR upstream temperature is lower than preset temperature, if, according to described SCR upstream temperature, control the aperture of bypass valve, the air flow in control engine suction tude, and then the delivery temperature of control engine.
4. according to the control system described in claim 1-3 any one, it is characterized in that, described control system also comprises, is arranged at the fuel nozzle of described DOC device upstream.
5. according to the control system described in claim 1-3 any one, it is characterized in that, when described ECU control unit does not also surpass predetermined threshold value for the amount of the particulate matter that carries in described DPF grain catcher, control described bypass valve and close, make air in the engine air inlet tube intercooler of all flowing through enter cylinder and fuel oil mixed combustion.
6. control system according to claim 3, it is characterized in that, described ECU control unit also, for when described SCR upstream temperature is during higher than preset temperature, is controlled described bypass valve and is closed, and makes air in the engine air inlet tube intercooler of all flowing through enter cylinder and fuel oil mixed combustion.
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| CN201420112219.6U CN203925695U (en) | 2014-03-12 | 2014-03-12 | The control system of engine exhaust temperature |
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| CN201420112219.6U CN203925695U (en) | 2014-03-12 | 2014-03-12 | The control system of engine exhaust temperature |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103883380A (en) * | 2014-03-12 | 2014-06-25 | 潍柴动力股份有限公司 | Method and system for controlling exhaust gas temperature of engine |
| CN106290496A (en) * | 2016-07-25 | 2017-01-04 | 杨林 | Filter and equipment thereof for diesel exhaust |
| CN107842412A (en) * | 2017-09-27 | 2018-03-27 | 无锡威孚力达催化净化器有限责任公司 | The renovation process and system of a kind of diesel particulate trap |
| CN109667680A (en) * | 2018-12-28 | 2019-04-23 | 潍柴动力股份有限公司 | A kind of row warms management method and device, system |
| CN114658574A (en) * | 2021-05-06 | 2022-06-24 | 长城汽车股份有限公司 | Engine air inlet system, control method thereof and vehicle |
-
2014
- 2014-03-12 CN CN201420112219.6U patent/CN203925695U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103883380A (en) * | 2014-03-12 | 2014-06-25 | 潍柴动力股份有限公司 | Method and system for controlling exhaust gas temperature of engine |
| CN103883380B (en) * | 2014-03-12 | 2016-08-24 | 潍柴动力股份有限公司 | The control method of engine exhaust temperature and system |
| CN106290496A (en) * | 2016-07-25 | 2017-01-04 | 杨林 | Filter and equipment thereof for diesel exhaust |
| CN107842412A (en) * | 2017-09-27 | 2018-03-27 | 无锡威孚力达催化净化器有限责任公司 | The renovation process and system of a kind of diesel particulate trap |
| CN109667680A (en) * | 2018-12-28 | 2019-04-23 | 潍柴动力股份有限公司 | A kind of row warms management method and device, system |
| CN109667680B (en) * | 2018-12-28 | 2022-06-28 | 潍柴动力股份有限公司 | Heat removal and management method, device and system |
| CN114658574A (en) * | 2021-05-06 | 2022-06-24 | 长城汽车股份有限公司 | Engine air inlet system, control method thereof and vehicle |
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