CN106285850A - A kind of engine exhaust processing system and method - Google Patents
A kind of engine exhaust processing system and method Download PDFInfo
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- CN106285850A CN106285850A CN201610780373.4A CN201610780373A CN106285850A CN 106285850 A CN106285850 A CN 106285850A CN 201610780373 A CN201610780373 A CN 201610780373A CN 106285850 A CN106285850 A CN 106285850A
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- heating
- engine
- heater
- exhaust
- treatment apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
- F01N3/027—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 electric or magnetic heating means
-
- 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
- F01N9/00—Electrical control of exhaust gas treating apparatus
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1404—Exhaust gas temperature
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1411—Exhaust gas flow rate, e.g. mass flow rate or volumetric flow rate
-
- 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
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)
- Exhaust Gas After Treatment (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
The invention provides a kind of engine exhaust processing system and method, this system includes: heater, controller and switching device；Heater is arranged on exhaust post-treatment apparatus of engine, and the power end of heater connects power supply by switching device；Controller is for controlling the on off state of switching device, and then controls the on off operating mode of heater place circuit；When controller detects heating instructions, exporting control signal, this control signal controls switching device Guan Bi, so that the tail gas that electromotor is discharged by heater heats, so that the exhaust temperature being input in exhaust post-treatment apparatus of engine meets demand.The tail gas that electromotor is directly got rid of by this system heats, and the state of machine former with electromotor does not associate, and does not affect the state of the former machine of electromotor, does not interferes with the transient process of electromotor.
Description
Technical field
The invention belongs to automatic control technology field, particularly relate to a kind of engine exhaust processing system and method.
Background technology
Along with automobile quantity steeply rises, vehicle exhaust becomes the main cause of municipal pollution；Vehicle exhaust mainly combustion
The product that material burning is insufficient.
Energy-saving and emission-reduction measure is more and more deep, and automobile exhaust emission standard is stricter, along with Europe six discharge standard
With the gradually enforcement of state six discharge standard, engine exhaust aftertreatment system becomes standard configuration.Exhaust after treatment system is used
Technology mainly includes DOC (Diesel Oxidation Catalyst, oxidation catalytic converter) technology, SCR (Selective
Catalytic Reduction, SCR) technology and DPF (Diesel Particulate Filter, diesel oil
Grain filter).
DOC is a kind of diesel engine truck exhaust post-processing technology, main by the oxidation reaction of catalyst remove in granule can
Volatile organic compounds, reduces the discharge of particulate matter (PM)；
DPF is arranged in diesel engine truck exhaust system, is reduced the device of particulate matter in aerofluxus (PM) by filtration；DPF is again
Time raw, it is also desirable to the temperature of DPF entrance reaches more than 600 DEG C could realize carbon granule and oxygen reaction, is burnt by carbon distribution, completes
The function of DPF cleaning.
SCR is a kind of after-treatment device reducing the NOx discharge in engine exhaust, and SCR catalyst is at 250 DEG C-350
DEG C the highest to the conversion efficiency of NOx in waste gas, if less than 250 DEG C, NH4+ ion cannot react efficiently with NOx, it may appear that
The problem that NH4+ reveals and NOx emission is high.
In engine exhaust aftertreatment system, in order to meet high SCR conversion efficiency, and, dpf regeneration demand, need
The temperature of engine exhaust to be improved, in prior art, improves row by modes such as intake-air throttle valve, exhaust shutter, rear sprays
Temperature.Intake-air throttle valve and exhaust shutter all can reduce the new charge amount of electromotor, will certainly cause engine air-fuel
Than reducing, burning deteriorates rate of fuel consumption and rises.Particularly when electromotor is in transient process, due to deficiency of air, dynamic property
Can become is worse.Exhaust shutter, except causing the reduction of charge flow rate, also results in the increase of pumping work, reduces supercharger
Efficiency, makes rate of fuel consumption deteriorate further, and transient process is more difficult to ensure.Rear spray mode adds fuel oil injecting times, to fuel injector
Life-span have a certain impact, meanwhile, its improve delivery temperature ability very limited, the most also bring the wind of oil dilution
Danger.
To sum up, the temperature raising ability of these modes is limited by some boundary conditions, can sacrifice electromotor dynamic property and
Economy, meanwhile, also can cause the reduction of emission level.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of engine exhaust processing system and method, to realize not
On the premise of sacrificing engine power performance and economy, improve the engine exhaust aftertreatment system requirement to delivery temperature.
First aspect, the present invention provides a kind of engine exhaust processing system, including: heater, controller, derailing switch
Part；
Described heater is arranged on exhaust post-treatment apparatus of engine, and the power end of described heater passes through institute
State switching device and connect power supply；
Described controller, is used for when detecting that exhaust post-treatment apparatus of engine is in the mode of operation needing heating,
Produce heating instructions, and according to the on off state of the described heating instructions output target control signal described switching device of control, make
The aerofluxus of described electromotor is heated by described heater.
Alternatively, on the gas exhaust piping before described heater is arranged on described exhaust post-treatment apparatus of engine；
Or,
Before described heater is arranged on the catalyst carrier in described engine exhaust treatment apparatus.
Alternatively, described controller, for controlling described derailing switch according to described heating instructions output target control signal
The on off state of part, makes described heater heat the aerofluxus of described electromotor, specifically for:
According to described heating instructions, the exhaust parameter of tail gas in Gather and input to described exhaust post-treatment apparatus of engine,
Described exhaust parameter includes delivery temperature and extraction flow；
Need according to described exhaust parameter and described exhaust post-treatment apparatus of engine corresponding to the mode of operation of heating
Target temperature, be calculated the heating power needed for described mode of operation；
The dutycycle of the control signal of output it is calculated according to described heating power；
And, exporting the target control signal of described dutycycle, described target control signal is used for making described heater
Will enter into the tail gas heating in described exhaust post-treatment apparatus of engine to described target temperature.
Alternatively, described controller is for according to described exhaust parameter and described exhaust post-treatment apparatus of engine needs
The target temperature corresponding to mode of operation of heating, is calculated the heating power needed for described mode of operation, specifically for:
When detecting that described exhaust post-treatment apparatus of engine is in SCR SCR heating mode, gather
The delivery temperature of the tail gas being input in described exhaust post-treatment apparatus of engine and extraction flow, according to described SCR heated mould
First object temperature needed for formula, described delivery temperature and described extraction flow, needed for being calculated described SCR heating mode
Heating power；
When detecting that described exhaust post-treatment apparatus of engine is in diesel particulate filter dpf regeneration pattern, gather
The delivery temperature of the tail gas being input in described exhaust post-treatment apparatus of engine and extraction flow, according to described dpf regeneration mould
The second target temperature needed for formula, described delivery temperature and described extraction flow, needed for being calculated described DPF heating mode
Heating power.
Alternatively, described controller, for being calculated the dutycycle of control signal according to described heating power, is specifically used
In:
Corresponding relation between inquiry heating power and dutycycle, obtains the control letter that calculated heating power is corresponding
Number dutycycle.
Alternatively, described switching device is relay；
The coil of described relay is connected in series with the first outfan of described controller, and the other end connects described controller
GND end；
The normally opened contact of described relay is connected on the circuit of described heater.
Alternatively, described controller is electronic control unit ECU.
Second aspect, the present invention provides a kind of engine exhaust processing method, is applied to engine exhaust processing system, institute
State the heater that engine exhaust processing system includes being arranged on exhaust post-treatment apparatus of engine, and described heater
Power end and switching device be connected between the positive pole of power supply and negative pole；Described method includes:
When detecting that described exhaust post-treatment apparatus of engine is in the mode of operation needing heating, produce heating and refer to
Order；
According to described heating instructions export target control signal, with control described switching device Guan Bi, make described in add hot charging
Put the tail gas to being input in described exhaust post-treatment apparatus of engine to heat.
Alternatively, described according to described heating instructions export target control signal, including:
According to described heating instructions, the exhaust parameter of tail gas in Gather and input to described exhaust post-treatment apparatus of engine,
Described exhaust parameter includes delivery temperature and extraction flow；
According to described delivery temperature, described extraction flow, and described exhaust post-treatment apparatus of engine needs heating
The target temperature that mode of operation is corresponding, is calculated the heating power needed for described mode of operation；
The dutycycle of the control signal of output it is calculated according to described heating power；
Exporting the target control signal of described dutycycle, described target control signal is used for making described heater to input
Tail gas heating in described exhaust post-treatment apparatus of engine is to described target temperature.
Alternatively, the dutycycle of the described control signal being calculated output according to described heating power, including:
Corresponding relation between inquiry heating power and dutycycle, obtains the control letter that calculated heating power is corresponding
Number dutycycle.
The engine exhaust processing system that the present invention provides includes: heater, controller and switching device；Heater
It is arranged on exhaust post-treatment apparatus of engine, and the power end of heater connects power supply by switching device；Controller is used
In the on off state of control switching device, and then control the on off operating mode of heater place circuit；Add when controller detects
During heat instruction, exporting control signal, this control signal controls switching device Guan Bi, so that the tail that electromotor is discharged by heater
Gas heats, so that the exhaust temperature being input in exhaust post-treatment apparatus of engine meets demand.This system is directly to sending out
The tail gas that motivation is got rid of heats, and the state of machine former with electromotor does not associate, and does not affect the state of the former machine of electromotor, will not
Affect the transient process of electromotor.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to
These accompanying drawings obtain other accompanying drawing.
Fig. 1 is the scheme of installation of a kind of heater of the embodiment of the present invention；
Fig. 2 is the scheme of installation of embodiment of the present invention another kind heater；
Fig. 3 is the control system schematic diagram of a kind of heater of the embodiment of the present invention；
Fig. 4 is the schematic flow sheet of the embodiment of the present invention a kind of engine exhaust processing method；
Fig. 5 is the schematic diagram that a kind of heating exhaust gas of the embodiment of the present invention interrupts.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under not making creative work premise, broadly falls into the scope of protection of the invention.
Refer to Fig. 1, it is shown that the scheme of installation of a kind of heater of the embodiment of the present invention, as it is shown in figure 1, add hot charging
Putting 110 and be arranged on exhaust post-treatment apparatus of engine 120 foremost, heater 110 is arranged on engine exhaust post processing
On gas exhaust piping 130 before device 120.Flange joint is passed through between heater 110 and gas exhaust piping 130.This kind is installed
Mode is flexible for installation, is not affected by exhaust post-treatment apparatus of engine 120.
Refer to Fig. 2, it is shown that the scheme of installation of embodiment of the present invention another kind heater, as in figure 2 it is shown, heating
Device 110 is integrated in the inside of exhaust post-treatment apparatus of engine 120, concrete, and heater 110 is arranged on engine exhaust
Before catalyst carrier in after-treatment device 120.This kind of mounting means, the cross-sectional area of heater strengthens, therefore, it can
Reduce the thickness of heater, thus reduce the resistance of heater；And, heater 110 closer to catalyst carrier,
Reduce tail gas thermal losses in transmitting procedure after heating, improve the efficiency of heating surface of heater.
Heater 110 shown in Fig. 1 and Fig. 2 mainly includes heating plate, binding post and package casing, wherein, binding post
For connecting power supply.
Refer to Fig. 3, it is shown that the control system schematic diagram of a kind of heater of the embodiment of the present invention, as it is shown on figure 3, should
Control system mainly includes controller 210, switching device 220 and power supply, and wherein, power supply uses the accumulator of automotive interior (to store
The voltage of battery is 24V).
One positive terminal of heater 110 is connected positive source, heater 110 after connecting with switching device 220
Negative terminal connect power cathode.
In the present embodiment, switching device 220 is electromagnetic relay, then the normally opened contact of electromagnetic relay K and heater
110 series connection；The coils connected in series of electromagnetic relay K is at the outfan (B1) of controller and GND end (B2)；Heater 110 is permissible
Including multiple unit heaters, multiple unit heaters are connected in series, and can individually control each heater, i.e. use classification control
Mode processed, controls the heating power of heater 110, to meet different temperatures requirement by many relay assemblies.
Controller 210 can use ECU (Electronic Control Unit, electronic control unit) to realize.ECU leads to
Cross the power supply state controlling to connect coil on the output, control the on off state of the normally opened contact of electromagnetic relay K, and then
Control the on off operating mode of the power supply circuits of heater；When power supply circuits are connected, heater is in heated condition, works as power supply
When circuit disconnects, heater stop heats.
The control process of ECU be described in detail below:
When the tail gas that electromotor is got rid of needs heating, the B1 pin output square-wave signal of ECU, the line of electromagnetic relay K
Circle energising, normally opened contact adhesive, heater 110 and power on, heater 110 begins to warm up.The side of B1 pin output
The dutycycle of ripple signal is controlled by ECU, according to the dutycycle of engine exhaust post processing demand modeling square-wave signal.
ECU detects when exhaust post-treatment apparatus of engine is in the mode of operation needing heating, such as, and SCR heated mould
Formula and dpf regeneration pattern, obtain the target temperature required for this mode of operation, meanwhile, gather the aerofluxus of electromotor output tail gas
Parameter, such as, delivery temperature and extraction flow.Then, analyzing these exhaust parameters, the operating power calculating for heater is done
Input；Such as, when dpf regeneration pattern, the temperature before needing DOC rises to more than at least 250 DEG C, to meet DOC oxidation
The required condition of reaction, meanwhile, extraction flow is also required to meet corresponding condition；If delivery temperature is relatively low, then the heating needed
Power is big；If delivery temperature is higher, then the heating power needed is relatively low.
ECU utilizes formula 1, according to target temperature, delivery temperature and extraction flow, calculates the heating needed for heater
Power:
Q=m*Cp* △ T (formula 1)
In formula 1, Q is the heat exchange amount needed for tail gas, and m is that exhaust gas mass flow obtains according to extraction flow calculating, and Cp is
The specific heat capacity of tail gas, △ T is the temperature difference before and after tail gas heating, and the Current Temperatures of tail gas can be obtained by sensor measurement；Mesh
Mark temperature can be obtained by test data.
ECU determines the dutycycle of control signal according to the heating power needed for heater, and dutycycle is the highest, accordingly,
The time scale that switching device is in closure state is the highest, and the time that heater switches on power is the longest, and heating power is also got over
High；On the contrary, dutycycle is the lowest, and the time scale that switching device is in closure state is the lowest, the time that heater switches on power
The shortest, heating power is the lowest.
In embodiments of the present invention, can be by between dutycycle and the heating power of test data calibration control signal
Corresponding relation, ECU inquires about this corresponding relation and obtains the dutycycle of control signal corresponding to required heating power.
Alternatively, the control system of the heater that the present embodiment provides, before starting heater, ECU needs inspection
Survey and whether meet entry condition.
In some embodiments of the invention, two pins (A1 and A2 in Fig. 3) of ECU arrange triggering switch S,
Whether the condition adjudgement that ECU triggers switch S by detection meets entry condition, when detecting that triggering switch S is off
Time, determine and meet entry condition；When detecting that triggering switch S is in closure state, determine and be unsatisfactory for entry condition.This function
Mainly for meeting some extreme conditions, such as, supply voltage is relatively low, it is impossible to when meeting normal power demands, can select
Do not enable heating exhaust gas function, and close this triggering switch S.
In other embodiments of the invention, trigger switch S to replace with CAN communication or other intelligent control method.
It should be noted that the heating control system shown in Fig. 3 is only principle schematic, will not generate electricity mechanical, electrical
Detailed annexation between source and electromagnetic relay, heater, but these annexations are to implement necessary to the present invention,
And be known in those skilled in the art.Meanwhile, corresponding short circuit and overload protection arrangement, such as, electric fuse etc. are needed.
The engine exhaust processing system that the present embodiment provides includes: heater, controller and switching device；Add hot charging
Put and be arranged on exhaust post-treatment apparatus of engine, and the power end of heater connects power supply by switching device；Controller
The first outfan electrically connect with switching device, for controlling the on off state of switching device, and then control heater place
The on off operating mode of circuit；When controller detects heating instructions, exporting control signal, this control signal controls switching device and closes
Close, so that the tail gas that electromotor is discharged by heater heats；Wherein, according to residing for exhaust post-treatment apparatus of engine
Target temperature needed for mode of operation, and, in Gather and input to exhaust post-treatment apparatus of engine the delivery temperature of tail gas and
Extraction flow, is calculated, according to delivery temperature, extraction flow and target temperature, the heating power that described mode of operation is corresponding；So
After, the dutycycle of control signal to be exported is calculated according to the heating power calculated, the dutycycle of control signal can control to add
Current value needed for heat, and then make heater by tail gas heating to target temperature.The tail that electromotor is directly got rid of by this system
Gas heats, and the state of machine former with electromotor does not associate, and does not affect the state of the former machine of electromotor, does not interferes with electromotor
Transient process.
Relative to above-mentioned engine exhaust processing system embodiment, present invention also offers engine exhaust processing method
Embodiment.
Refer to Fig. 4, it is shown that the schematic flow sheet of the embodiment of the present invention a kind of engine exhaust processing method, the method
Being applied in the controller of above-mentioned engine exhaust processing system, this engine exhaust processing system includes heater, opens
Closing device and controller, wherein, heater is arranged on exhaust post-treatment apparatus of engine, heater and switching device string
Connecting power supply after connection, controller controls the duty of heater by controlling switching device.As shown in Figure 4, this controlling party
Method includes:
S110, it is judged that whether the current state of electromotor meets heating function unlocking condition；If it is satisfied, then perform
S120；If be unsatisfactory for, then perform S150.
This step mainly realizes heating function and interrupts, it is judged that whether the running status of electromotor meets corresponding condition,
If it is the most satisfied, it is determined that to meet heating function unlocking condition；If there being any one to be unsatisfactory for, it is determined that meet middle broken strip
Part.
Refer to Fig. 5, the schematic diagram interrupted for a kind of heating exhaust gas of the embodiment of the present invention, add hot charging as it is shown in figure 5, trigger
The condition putting interruption heating function includes two big classes, and wherein, a class mainly includes the state of electromotor critical system, including: turn
Speed, distributive value, EGR (Exhaust Gas Recycling, gas recirculation system) state, choke valve state, VTG
Temperature before temperature, DPF before (Variable Turbine Geometry, variable-area turbocharger) state, intake air temperature, DOC
Temperature SCR functional status, DPF functional status before degree, SCR；Another kind of is the functional status of electromotor, specifically include that fault,
Mode of operation, enable on off state (that is, mentioned above manual trigger switch S)；Wherein, mode of operation include normal mode,
SCR heating mode and dpf regeneration pattern, wherein, heater works main in SCR heating mode and dpf regeneration pattern.
When any one condition in this two big class condition is unsatisfactory for respective threshold, heating exhaust gas function down trigger, i.e.
Stop the tail gas heating discharging for electromotor.
S120, gathers electromotor and discharges delivery temperature and the extraction flow of tail gas.
Delivery temperature can be detected by temperature sensor, and extraction flow can be detected by flow transducer, and temperature passes
The data that sensor and flow transducer detect pass to controller.
S130, obtains the target temperature corresponding to mode of operation of engine exhaust aftertreatment system, and utilize delivery temperature,
Extraction flow and target temperature are calculated required heating power.
The temperature that under different working modes, engine exhaust needs is different, and such as, the temperature that SCR catalyst needs is 250
DEG C～350 DEG C, i.e. the target temperature that SCR heating mode is corresponding is 250 DEG C～350 DEG C；Under dpf regeneration pattern, DPF entrance
Temperature needs to reach more than 600 DEG C could realize carbon granule and oxygen reaction, i.e. target temperature corresponding to dpf regeneration pattern is
600℃。
Delivery temperature and target temperature is utilized to be calculated temperature difference, according to extraction flow, temperature difference and the specific heat of gas
Hold, utilize formula 1 to be calculated the heat exchange amount required for the tail gas that electromotor is discharged, i.e. to be calculated the heating power of needs.
Can be calculated the heating power of initial demand according to formula 1, controller can control heater output phase
The tail gas that electromotor exports by thermocurrent that adds answered heats.
S140, obtains the dutycycle of control signal, exports the control signal of this dutycycle according to described heating power, with control
The tail gas heating that electromotor is discharged by refrigerating/heating apparatus is to target temperature.
According to test data, obtaining the corresponding relation between heating power and the dutycycle of control signal, then, inquiry should
Corresponding relation obtains the control signal dutycycle that required heating power is corresponding.Then, export the control signal of this dutycycle, and
The control signal of this dutycycle passing to switching device, thus controls the switching device of switching device, dutycycle is the highest, accordingly
, the time scale that switching device is in closure state is the highest, and the time that heater switches on power is the highest, and heating power is also
The highest.
S150, controls heater stop heating.
When the current state judging electromotor is unsatisfactory for heating function unlocking condition, interrupt the heater of heater
Make.
The engine exhaust processing method that the present embodiment provides, is applied in engine exhaust processing system, this system bag
Include heater, controller and switching device；Heater is arranged on exhaust post-treatment apparatus of engine, and heater
Power end connects power supply by switching device；Controller controls the power-on circuit of heater by controlling switching device；When sending out
When the tail gas that motivation is discharged needs heating, controlling switching device Guan Bi, the tail gas heating making heater export electromotor arrives
Target temperature；Controller is heated to target temperature to tail gas from Current Temperatures by controlling the Duty ratio control of output control signal
Degree.The tail gas that electromotor is directly got rid of by the method heats, and the state of machine former with electromotor does not associate, and does not affect and starts
The state of the former machine of machine, does not interferes with the transient process of electromotor.
For aforesaid each method embodiment, in order to be briefly described, therefore it is all expressed as a series of combination of actions, but
Being that those skilled in the art should know, the present invention is not limited by described sequence of movement, because according to the present invention, certain
A little steps can use other orders or carry out simultaneously.Secondly, those skilled in the art also should know, is retouched in description
The embodiment stated belongs to preferred embodiment, necessary to involved action and the module not necessarily present invention.
It should be noted that each embodiment in this specification all uses the mode gone forward one by one to describe, each embodiment weight
Point explanation is all the difference with other embodiments, and between each embodiment, identical similar part sees mutually.
For device class embodiment, due to itself and embodiment of the method basic simlarity, so describe is fairly simple, relevant part ginseng
See that the part of embodiment of the method illustrates.
Finally, in addition it is also necessary to explanation, in this article, the relational terms of such as first and second or the like be used merely to by
One entity or operation separate with another entity or operating space, and not necessarily require or imply these entities or operation
Between exist any this reality relation or order.And, term " includes ", " comprising " or its any other variant meaning
Containing comprising of nonexcludability, so that include that the process of a series of key element, method, article or equipment not only include that
A little key elements, but also include other key elements being not expressly set out, or also include for this process, method, article or
The key element that equipment is intrinsic.In the case of there is no more restriction, statement " including ... " key element limited, do not arrange
Except there is also other identical element in including the process of described key element, method, article or equipment.
Described above to the disclosed embodiments, makes those skilled in the art be capable of or uses the present invention.To this
The multiple amendment of a little embodiments will be apparent from for a person skilled in the art, and generic principles defined herein can
With without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will not be limited
It is formed on the embodiments shown herein, and is to fit to consistent with principles disclosed herein and features of novelty the widest
Scope.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For Yuan, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (10)
1. an engine exhaust processing system, it is characterised in that including: heater, controller, switching device；
Described heater is arranged on exhaust post-treatment apparatus of engine, and the power end of described heater pass through described in open
Close device and connect power supply；
Described controller, for when detecting that exhaust post-treatment apparatus of engine is in the mode of operation needing heating, producing
Heating instructions, and the on off state of described switching device is controlled according to described heating instructions output target control signal, make described
The aerofluxus of described electromotor is heated by heater.
System the most according to claim 1, it is characterised in that:
Described heater is arranged on the gas exhaust piping before described exhaust post-treatment apparatus of engine；
Or,
Before described heater is arranged on the catalyst carrier in described engine exhaust treatment apparatus.
System the most according to claim 1 and 2, it is characterised in that described controller, for defeated according to described heating instructions
Go out target control signal and control the on off state of described switching device, make described heater that the aerofluxus of described electromotor to be carried out
Heating, specifically for:
According to described heating instructions, in Gather and input to described exhaust post-treatment apparatus of engine, the exhaust parameter of tail gas, described
Exhaust parameter includes delivery temperature and extraction flow；
The mesh corresponding to the mode of operation of heating is needed according to described exhaust parameter and described exhaust post-treatment apparatus of engine
Mark temperature, is calculated the heating power needed for described mode of operation；
The dutycycle of the control signal of output it is calculated according to described heating power；
And, exporting the target control signal of described dutycycle, described target control signal is used for making described heater by defeated
Enter the tail gas heating in described exhaust post-treatment apparatus of engine to described target temperature.
System the most according to claim 3, it is characterised in that described controller is for according to described exhaust parameter and institute
State exhaust post-treatment apparatus of engine and need the target temperature corresponding to mode of operation of heating, be calculated described mode of operation
Required heating power, specifically for:
When detecting that described exhaust post-treatment apparatus of engine is in SCR SCR heating mode, Gather and input
The delivery temperature of the tail gas in described exhaust post-treatment apparatus of engine and extraction flow, according to described SCR heating mode institute
First object temperature, described delivery temperature and the described extraction flow needed, is calculated the heating needed for described SCR heating mode
Power；
When detecting that described exhaust post-treatment apparatus of engine is in diesel particulate filter dpf regeneration pattern, Gather and input
The delivery temperature of the tail gas in described exhaust post-treatment apparatus of engine and extraction flow, according to described dpf regeneration pattern institute
The second target temperature, described delivery temperature and the described extraction flow needed, is calculated the heating needed for described DPF heating mode
Power.
System the most according to claim 1, it is characterised in that described controller is for calculating according to described heating power
To the dutycycle of control signal, specifically for:
Corresponding relation between inquiry heating power and dutycycle, obtains control signal corresponding to calculated heating power
Dutycycle.
System the most according to claim 1, it is characterised in that described switching device is relay；
The coil of described relay is connected in series with the first outfan of described controller, and the other end connects described controller
GND end；
The normally opened contact of described relay is connected on the circuit of described heater.
System the most according to claim 1, it is characterised in that described controller is electronic control unit ECU.
8. an engine exhaust processing method, it is characterised in that be applied to engine exhaust processing system, described electromotor is arranged
Gas processing system includes the heater being arranged on exhaust post-treatment apparatus of engine, and the power end of described heater with
Switching device is connected between the positive pole of power supply and negative pole；Described method includes:
When detecting that described exhaust post-treatment apparatus of engine is in the mode of operation needing heating, produce heating instructions；
Export target control signal according to described heating instructions, to control described switching device Guan Bi, make described heater pair
The tail gas being input in described exhaust post-treatment apparatus of engine heats.
Method the most according to claim 8, it is characterised in that described according to described heating instructions output target control letter
Number, including:
According to described heating instructions, in Gather and input to described exhaust post-treatment apparatus of engine, the exhaust parameter of tail gas, described
Exhaust parameter includes delivery temperature and extraction flow；
According to described delivery temperature, described extraction flow, and described exhaust post-treatment apparatus of engine needs the work of heating
The target temperature that pattern is corresponding, is calculated the heating power needed for described mode of operation；
The dutycycle of the control signal of output it is calculated according to described heating power；
Exporting the target control signal of described dutycycle, described target control signal is used for making described heater will enter into institute
State the tail gas heating in exhaust post-treatment apparatus of engine to described target temperature.
Method the most according to claim 8, it is characterised in that described be calculated output according to described heating power
The dutycycle of control signal, including:
Corresponding relation between inquiry heating power and dutycycle, obtains control signal corresponding to calculated heating power
Dutycycle.
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| CN201610780373.4A CN106285850A (en) | 2016-08-31 | 2016-08-31 | A kind of engine exhaust processing system and method |
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| CN201610780373.4A CN106285850A (en) | 2016-08-31 | 2016-08-31 | A kind of engine exhaust processing system and method |
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| CN108152041A (en) * | 2017-12-26 | 2018-06-12 | 潍柴动力股份有限公司 | A kind of carbon distribution model experiment condition control method and device |
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