CN103696832A - Method and system for controlling regeneration temperature of diesel engine particulate matter collector - Google Patents
Method and system for controlling regeneration temperature of diesel engine particulate matter collector Download PDFInfo
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- CN103696832A CN103696832A CN201310719771.1A CN201310719771A CN103696832A CN 103696832 A CN103696832 A CN 103696832A CN 201310719771 A CN201310719771 A CN 201310719771A CN 103696832 A CN103696832 A CN 103696832A
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Abstract
The invention discloses a method and system for controlling a regeneration temperature of a diesel engine particulate matter collector. The method comprises a first step of presetting a particulate matter collector prior set temperature and steady state correction fuel injection quantities corresponding to different exhaust gas mass flow; a second step of determining current steady state fuel injection quantities according to the current exhaust gas mass flow, the particulate matter collector prior set temperature and the actual temperature in an oxidized catalytic converter; a third step of determining the current fuel injection quantity after steady state correction according to the current steady state fuel injection quantity and the steady state correction fuel injection quantity corresponding to the current exhaust gas mass flow, and outputting corresponding oil injection signals to an aftertreatment diesel injection system; and a fourth step of performing closed-loop control on the current fuel injection quantity after steady state correction according to a difference value between the particulate matter collector prior set temperature and the particulate matter collector prior actual temperature. According to the method, steady state correction is performed on the current steady state fuel injection quantity, the influence on heat transfer of an oxidized catalytic converter carrier caused by exhaust gas is eliminated, and the regeneration temperature of the diesel engine particulate matter collector can be controlled accurately.
Description
Technical field
The present invention relates to diesel exhaust aftertreatment technical field, particularly relate to a kind of controlling method and system of diesel particulate trap regeneration temperature.
Background technique
Please refer to Fig. 1, the structure schematic diagram that Fig. 1 is diesel engine post-processing system, the arrow in figure shows the flow direction of diesel exhaust gas.
The after-treatment system of diesel engine mainly comprises oxidizing catalytic converter (the Diesel Oxidation Catalysis arranging along exhaust gas flow direction, DOC), particulate matter trap (Diesel Particulate Filter, DPF), selective catalysis converter (Selective Catalytic Reduciton, SCR) and ammonia catcher (ASC).
Oxidizing catalytic converter is first passed through in the exhaust of diesel engine, under the effect of catalyzer, HC in exhaust, CO and SOF(Soluble Organic Fracitons, organic soluble material) at lower temperature, carry out oxidation reaction with the oxygen in exhaust, be converted into CO
2and H
2o, NO is converted to NO
2, exhaust afterwards enters particulate matter trap, and the particulate in exhaust is captured, and then, through selective catalysis converter, ammonia catcher, finally enters in atmosphere.
Lengthening along with the operating time, the particulate matter of piling up on particulate matter trap is more and more, not only affect the filtering effect of particulate matter trap, also can increase exhaust back pressure, affect ventilation and the burning of diesel engine, cause output power to reduce, oil consumption increases, so, how to eliminate in time the particulate matter on particulate matter trap, be particulate matter trap regeneration, most important.
Initiative regeneration is one of method making particulate matter trap regeneration, and the method utilizes outside energy to improve the temperature in particulate matter trap, makes particulate matter ignition.Particularly, when the front and back of particulate matter trap differential pressure pickup detects back pressure before and after particulate matter trap when excessive, think and reach the particulate matter cumulant that particulate matter trap can bear, now pass through outside energy, as sprayed the mixed combining combustion of diesel oil and waste gas before oxidizing catalytic converter, improve the temperature in particulate matter trap, make the particulate matter oxidizing fire that wherein deposits, thereby reach the object of regeneration.
But, in initiative regeneration process, if cannot the fuel injection quantity of reprocessing diesel injection system be control effectively, can cause two kinds of results:
Fuel injection quantity is very few, and in particulate matter trap, temperature does not reach the initiation temperature of particulate matter, or particulate matter burning is insufficient, causes the regeneration effect of particulate matter trap undesirable, and diesel engine performance is not effectively improved;
Fuel injection quantity is too much, cause in particulate matter trap temperature increase too high too fast, surpass the high-temperature resistant ability of catalyzer in oxidizing catalytic converter, particulate matter trap and selection type catalytic converter, cause catalyzer scorification, the disabler of after-treatment system, exhaust exceeds standard.
In prior art, during particulate matter trap initiative regeneration, the method for controlling fuel injection quantity is:
Closed loop PID control, for different operating mode different type of machines, carry out the general demarcation of detailed arteries and veins, form the general figure of arteries and veins, as basic fuel injection amount, the setting temperature of take before particulate matter trap is as controlling target, the difference that compares the front setting temperature of particulate matter trap and true temperature, the fuel injection quantity by PI algorithm control reprocessing diesel injection system, makes the true temperature before particulate matter trap be tending towards setting temperature;
Open loop is controlled, and for different operating mode different type of machines, carries out the general demarcation of detailed arteries and veins, forms the general figure of arteries and veins, and according to arteries and veins, general figure regulates fuel injection quantity, thereby controls the true temperature before particulate matter trap.
In practical work process, the heat exchange of waste gas and oxidizing catalytic converter, the variation of exhaust gas flow, these factors all can affect the true temperature before particulate matter trap, these above-mentioned two kinds of control modes are not all considered, thereby cannot accurately control fuel injection quantity, to avoid the generation that regeneration temperature is undesirable or regeneration temperature is out of control.
In view of this, how accurately controlling fuel injection quantity, thereby accurately control the temperature in particulate matter trap initiative regeneration process, prevent that regeneration temperature is undesirable or regeneration temperature is out of control, is the current technical issues that need to address of those skilled in the art.
Summary of the invention
The controlling method and the system that the object of this invention is to provide a kind of diesel particulate trap regeneration temperature, can accurately control fuel injection quantity, thereby accurately control the temperature in particulate matter trap initiative regeneration process, effectively avoid that regeneration temperature is undesirable or regeneration temperature is out of control.
For solving the problems of the technologies described above, the invention provides a kind of controlling method of particulate matter trap regeneration temperature of diesel engine, described diesel engine comprises along waste gas streams to oxidizing catalytic converter and the particulate matter trap arranged successively, is provided with reprocessing diesel injection system before described oxidizing catalytic converter; Described controlling method comprises the steps:
10) setting temperature and corresponding to the stable state correction fuel injection quantity of different exhaust air mass flow before default particulate matter trap;
20) according to true temperature in setting temperature and oxidizing catalytic converter before current exhaust air mass flow, particulate matter trap, determine when presteady state fuel injection quantity;
30) according to determining fuel injection quantity when presteady state correction after when presteady state fuel injection quantity and the stable state correction fuel injection quantity corresponding with current exhaust air mass flow, and the output fuel injection signal corresponding with working as presteady state correction axle fuel injection quantity described reprocessing diesel injection system extremely;
40), according to the difference of true temperature before setting temperature before particulate matter trap and particulate matter trap, fuel injection quantity after presteady state correction is carried out to closed loop control.
The controlling method of the particulate matter trap regeneration temperature of diesel engine provided by the present invention, to working as presteady state fuel injection quantity, carrying out on the basis of closed loop control, based on exhaust air mass flow, to working as presteady state fuel injection quantity, carried out stable state correction, thereby eliminated the impact of oxidizing catalytic converter carrier being conducted heat and being caused because of waste gas, improved the accuracy of reprocessing diesel injection system fuel injection quantity, thereby can accurately control the temperature in particulate matter trap initiative regeneration process, effectively avoid that regeneration temperature is undesirable or regeneration temperature is out of control.
Preferably, in step 10), also preset the transient state modifying factor corresponding to different exhaust air mass flow variance ratio; Step 30) after, also comprise step:
31) according to fuel injection quantity after presteady state correction, the stable state correction fuel injection quantity that current exhaust air mass flow is corresponding, and the transient state modifying factor corresponding with current exhaust air mass flow variance ratio determine fuel injection quantity after current transient state correction, and the output fuel injection signal corresponding with fuel injection quantity after current transient state correction is to described reprocessing diesel injection system;
Step 40), in, according to the difference of true temperature before setting temperature before particulate matter trap and particulate matter trap, fuel injection quantity after the current transient state correction based on fuel injection quantity correction after presteady state correction is carried out to closed loop control.
Preferably, step 31) in, after current transient state correction, fuel injection quantity is the long-pending stack of fuel injection quantity after presteady state correction and stable state correction fuel injection quantity and transient state modifying factor.
Preferably, step 20) in, when the formula of presteady state fuel injection quantity is:
Wherein, q---as presteady state fuel injection quantity, mg/s;
M---current exhaust air mass flow, kg/h;
T
des---setting temperature before particulate matter trap, K;
T
doc---true temperature in oxidizing catalytic converter, K;
Cal---fuel oil heat-dissipating value, MJ/kg;
C
p, eg---the thermal capacitance of waste gas, J/(kgK).
Preferably, step 30), in, after presteady state correction, fuel injection quantity is the stack when presteady state fuel injection quantity, the stable state correction fuel injection quantity corresponding with current exhaust air mass flow.
Preferably, the closed loop control step 40) adopts PID to control.
The present invention also provides a kind of control system of particulate matter trap regeneration temperature of diesel engine, described diesel engine comprises along waste gas streams to oxidizing catalytic converter and the particulate matter trap arranged successively, is provided with reprocessing diesel injection system before described oxidizing catalytic converter; Described control system comprises:
Detection device: obtain true temperature and the front true temperature of particulate matter trap in current exhaust air mass flow, oxidizing catalytic converter;
Storage: setting temperature and corresponding to the stable state correction fuel injection quantity of different exhaust air mass flow before default particulate matter trap;
Controller: determine when presteady state fuel injection quantity according to true temperature in setting temperature and oxidizing catalytic converter before current exhaust air mass flow, particulate matter trap; And according to determining fuel injection quantity when presteady state correction after when presteady state fuel injection quantity and the stable state correction fuel injection quantity corresponding with current exhaust air mass flow, and output and fuel injection quantity is corresponding after presteady state correction fuel injection signal described reprocessing diesel injection system extremely; According to the difference of true temperature before setting temperature before particulate matter trap and particulate matter trap, fuel injection quantity after presteady state correction is carried out to closed loop control.
This control system is consistent with above-mentioned controlling party ratio juris, can reach identical technique effect, repeats no more here.
Preferably, described storage is also preset the transient state modifying factor corresponding to different exhaust air mass flow variance ratio;
Described controller is determined after presteady state correction after fuel injection quantity, also according to fuel injection quantity after presteady state correction, the stable state correction fuel injection quantity that current exhaust air mass flow is corresponding, and transient state modifying factor corresponding to current exhaust air mass flow variance ratio determine fuel injection quantity after current transient state correction, and the output fuel injection signal corresponding with fuel injection quantity after current transient state correction is to described reprocessing diesel injection system; And according to the difference of true temperature before setting temperature before particulate matter trap and particulate matter trap, fuel injection quantity after the current transient state correction based on fuel injection quantity correction after presteady state correction is carried out to closed loop control.
The module of preferably, carrying out closed loop control in described controller is pid control module.
Preferably, before described particulate matter trap, setting temperature is value range.
Accompanying drawing explanation
Fig. 1 is the structure schematic diagram of diesel engine post-processing system;
Fig. 2 is particulate matter trap regeneration temperature controlling method the first embodiment's provided by the present invention flow chart;
Fig. 3 is particulate matter trap regeneration temperature controlling method the first embodiment's provided by the present invention control principle drawing;
Fig. 4 is particulate matter trap regeneration temperature controlling method the second embodiment's provided by the present invention flow chart;
Fig. 5 is particulate matter trap regeneration temperature controlling method the second embodiment's provided by the present invention control principle drawing;
Fig. 6 shows the rule schematic diagram between transient state modifying factor and exhaust air mass flow variance ratio.
In Fig. 1:
Oxidizing catalytic converter 101, particulate matter trap 102, selective catalysis converter 103, ammonia catcher 104.
Embodiment
Core of the present invention is to provide a kind of controlling method and system of diesel particulate trap regeneration temperature, can accurately control fuel injection quantity, thereby accurately control the temperature in particulate matter trap initiative regeneration process, effectively avoid that regeneration temperature is undesirable or regeneration temperature is out of control.
In order to make those skilled in the art person understand better the present invention program, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.For ease of understanding and describing succinctly, below in conjunction with controlling method and the system of diesel particulate trap regeneration temperature, to make an explanation, beneficial effect no longer repeats to discuss.
The after-treatment system of diesel engine comprises along waste gas streams to oxidizing catalytic converter and the particulate matter trap arranged successively; Before oxidizing catalytic converter, be provided with reprocessing diesel injection system, when particulate matter trap reaches the particulate matter cumulant can bear, by reprocessing diesel injection system injected fuel and the mixed combining combustion of waste gas, improve the temperature in particulate matter trap, make the particulate matter oxidizing fire of deposition in particulate matter trap, realize the initiative regeneration of particulate matter trap.
Please refer to Fig. 2-3, Fig. 2 is particulate matter trap regeneration temperature controlling method the first embodiment's provided by the present invention flow chart; Fig. 3 is particulate matter trap regeneration temperature controlling method the first embodiment's provided by the present invention control principle drawing.
In this embodiment, the controlling method of particulate matter trap regeneration temperature comprises the steps:
Setting temperature and corresponding to the stable state correction fuel injection quantity of different exhaust air mass flow before S11, default particulate matter trap;
The present embodiment provides a kind of control system of particulate matter trap regeneration temperature, this control system can arrange storage, setting temperature and predeterminable in this storage corresponding to the stable state correction fuel injection quantity of different exhaust air mass flow before particulate matter trap in this step, in order to calling.
S12, definite when presteady state fuel injection quantity according to true temperature in setting temperature and oxidizing catalytic converter before current exhaust air mass flow, particulate matter trap;
When the formula of presteady state fuel injection quantity as follows:
Wherein,
Q---when presteady state fuel injection quantity, unit: mg/s;
M---current exhaust air mass flow, unit: kg/h;
T
des---setting temperature before particulate matter trap, unit: K;
T
doc---true temperature in oxidizing catalytic converter, unit: K;
Cal---fuel oil heat-dissipating value, unit: MJ/kg;
C
p, eg---the thermal capacitance of waste gas, unit: J/(kgK).
Above-mentioned formula has been given as examples determines a kind of mode when presteady state fuel injection quantity, during practical operation, also can obtain by other means when presteady state fuel injection quantity.
Current exhaust air mass flow and the true temperature in oxidizing catalytic converter of diesel engine can directly read in the detection device of diesel engine system, or also special detection device can be set, as the flow transducer of measurement exhaust air mass flow, the temperature transducer of measurement temperature etc. obtains separately.
The control system of particulate matter trap regeneration temperature can arrange controller, described controller calls the front setting temperature of particulate matter trap default in storage, and obtain after the current exhaust air mass flow and the true temperature in oxidizing catalytic converter that detection device records, can calculate when presteady state fuel injection quantity according to above-mentioned formula.
It is pointed out that the thermal capacitance C of fuel oil heat-dissipating value Cal and waste gas
p, egas constant value, the interior controller that supplies of storage that can default in control system calls, and also can directly be arranged at the data processing module of controller.
S13, according to determining fuel injection quantity when presteady state correction after when presteady state fuel injection quantity and the stable state correction fuel injection quantity corresponding with current exhaust air mass flow, and export and fuel injection quantity is corresponding after presteady state correction fuel injection signal described reprocessing diesel injection system extremely;
Because waste gas streams is when the oxidizing catalytic converter, can conduct heat to its carrier, so that determines in step S12 can not guarantee that the true temperature before particulate matter trap reaches setting temperature when presteady state fuel injection quantity, therefore, need to revise the presteady state fuel injection quantity of working as of determining in step S12.
Controller can be transferred the stable state correction fuel injection quantity corresponding with current exhaust air mass flow in storage, in integrating step S12, determine when presteady state fuel injection quantity, obtain fuel injection quantity after presteady state correction.
In concrete scheme, after presteady state correction, fuel injection quantity is the stack when presteady state fuel injection quantity, the stable state correction fuel injection quantity corresponding with current exhaust air mass flow.
Controller is definite after fuel injection quantity, also to be exported with the fuel injection signal that fuel injection quantity is corresponding after presteady state correction to described reprocessing diesel injection system after presteady state correction.
Wherein, the stable state correction fuel injection quantity corresponding to different exhaust air mass flow can obtain according to Experimental Calibration; Particularly, for a certain exhaust air mass flow, can utilize above-mentioned formula or other modes to determine the fuel injection quantity corresponding to this exhaust air mass flow, under this fuel injection quantity, detect the true temperature before particulate matter trap, reach the front setting temperature of particulate matter trap, the fuel injection quantity also needing is stable state correction fuel injection quantity corresponding to this exhaust air mass flow.
S14, according to the difference of true temperature before setting temperature before particulate matter trap and particulate matter trap, fuel injection quantity after presteady state correction is carried out to closed loop control.
The setting temperature before particulate matter trap of take is to control target, the difference that compares the front setting temperature of particulate matter trap and the front true temperature of particulate matter trap, according to this difference, the fuel injection quantity after presteady state correction of determining in step S13 is carried out to closed loop control, so that true temperature is tending towards the front setting temperature of particulate matter trap before particulate matter trap.
In concrete scheme, by PID, control and realize above-mentioned closed loop control, in the controller of described control system, pid control module is set, simple and practical easy to adjust again.Can certainly realize above-mentioned closed loop control by other control modes.
Controlling method and the system of the particulate matter trap regeneration temperature of this diesel engine, to working as presteady state fuel injection quantity, carrying out on the basis of closed loop control, based on exhaust air mass flow, to working as presteady state fuel injection quantity, carried out stable state correction, thereby eliminated the impact of oxidizing catalytic converter carrier being conducted heat and being caused because of waste gas, improved the accuracy of reprocessing diesel injection system fuel injection quantity, thereby can accurately control the temperature in particulate matter trap initiative regeneration process, effectively avoid that regeneration temperature is undesirable or regeneration temperature is out of control.
For above-described embodiment, can make further improvement.Can understand with reference to figure 4-5, Fig. 4 is particulate matter trap regeneration temperature controlling method the second embodiment's provided by the present invention flow chart; Fig. 5 is particulate matter trap regeneration temperature controlling method the second embodiment's provided by the present invention control principle drawing.
The method step that this embodiment provides and the first embodiment are basic identical, just after step S13, have increased the transient state correction to fuel injection quantity.In this embodiment, the controlling method of particulate matter trap regeneration temperature comprises the steps:
Setting temperature before S21, default particulate matter trap, corresponding to the stable state correction fuel injection quantity of different exhaust air mass flow, and corresponding to the transient state modifying factor of different exhaust air mass flow variance ratio;
S22, definite when presteady state fuel injection quantity according to true temperature in setting temperature and oxidizing catalytic converter before current exhaust air mass flow, particulate matter trap;
S23, according to when presteady state fuel injection quantity and the stable state correction fuel injection quantity corresponding with current exhaust air mass flow definite after presteady state correction fuel injection quantity;
S24, basis fuel injection quantity after presteady state correction, the stable state correction fuel injection quantity that current exhaust air mass flow is corresponding, and the transient state modifying factor corresponding with current exhaust air mass flow variance ratio determine fuel injection quantity after current transient state correction, and the output fuel injection signal corresponding with fuel injection quantity after current transient state correction is to described reprocessing diesel injection system;
S25, according to the difference of true temperature before setting temperature before particulate matter trap and particulate matter trap, fuel injection quantity after the current transient state correction based on fuel injection quantity correction after presteady state correction is carried out to closed loop control.
In this embodiment, increase step S24, according to stable state exhaust air mass flow, to revising when presteady state fuel injection quantity, obtain after presteady state correction after fuel injection quantity, further according to exhaust air mass flow, change fuel injection quantity after presteady state correction is revised, obtain fuel injection quantity after current transient state correction.
The thermal capacitance of oxidizing catalytic converter is larger, temperature variation after oxidizing catalytic converter is slower, compared certain delay with fuel oil oxidation heat liberation, when exhaust air mass flow changes, only depend on closed loop control to regulate the fuel injection quantity under transient state, because the delay of temperature, cause the continuous integration of integrator, can cause that fuel oil sprays excessive or very few, so, not only can not reduce error, before also can making particulate matter trap, temperature control deviation scope increases, for reducing under transient state range of temperature before particulate matter trap, also need to aforementioned after presteady state correction fuel injection quantity carry out transient state correction.
Transient state modifying factor corresponding to different exhaust air mass flow variance ratio is also predeterminable in the storage of control system; Controller can be transferred the transient state modifying factor corresponding with current exhaust air mass flow variance ratio in storage, the fuel injection quantity after presteady state correction of determining in integrating step S23 and the stable state correction fuel injection quantity corresponding with current exhaust air mass flow, obtain fuel injection quantity after current transient state correction.
In concrete scheme, after current transient state correction, fuel injection quantity is the long-pending stack of fuel injection quantity after presteady state correction and stable state correction fuel injection quantity and transient state modifying factor; In this scheme, the long-pending transient state correction fuel injection quantity that can be considered of stable state correction fuel injection quantity and transient state modifying factor.On this basis, in step S25, the setting temperature before particulate matter trap of take, as controlling target, according to the difference of true temperature before setting temperature before particulate matter trap and particulate matter trap, carries out closed loop control to fuel injection quantity after this current transient state correction.
Wherein, corresponding to the transient state modifying factor of different exhaust air mass flow variance ratio, also can obtain according to Experimental Calibration.Varying in size of initial exhaust air mass flow, when exhaust air mass flow variance ratio is identical, different to the variable effect of true temperature before particulate matter trap, so when carrying out transient state correction, also should revise based on stable state correction fuel injection quantity.That is, if initial exhaust air mass flow is larger, when flow changes, its transient state correction oil mass is relatively large, if initial exhaust air mass flow is less, when flow changes, its transient state correction oil mass is relatively little.
Please refer to Fig. 6, Fig. 6 shows the rule schematic diagram between transient state modifying factor and exhaust air mass flow variance ratio.In Fig. 6, transverse coordinate axis represents exhaust air mass flow variance ratio dm/dt, and along slope coordinate axle represents transient state modifying factor a.
As can be seen from Figure 6,, when exhaust air mass flow variance ratio is zero, while not existing exhaust air mass flow to change, transient state modifying factor is zero, does not now need to carry out transient state correction; When exhaust air mass flow variance ratio increases, transient state modifying factor is and reduces trend.Particularly, when exhaust air mass flow variance ratio is negative value, exhaust air mass flow is while reducing trend, transient state modifying factor be on the occasion of, fuel injection quantity is increase trend, when exhaust air mass flow variance ratio is reduced to after certain value, transient state modifying factor tends towards stability; When exhaust air mass flow variance ratio be on the occasion of, when exhaust air mass flow is increase trend, transient state modifying factor is negative value, fuel injection quantity is and reduces trend, when exhaust air mass flow variance ratio is increased to after certain value, transient state modifying factor also tends towards stability.
The controlling method of particulate matter trap regeneration temperature provided by the invention and system, only need to demarcate for exhaust air mass flow and corresponding stable state correction fuel injection quantity and the transient state modifying factor of variance ratio thereof, control and compare with open loop of the prior art, do not need to carry out the general demarcation of detailed arteries and veins, reduced staking-out work amount; Owing to fuel injection quantity having been carried out to the correction of stable state and transient state, more simple open loop control and closed loop control have higher validity, thereby can accurately control the temperature in particulate matter trap initiative regeneration process, avoid that regeneration temperature is undesirable or regeneration temperature is out of control.
In the various embodiments described above, before particulate matter trap, setting temperature is preferably set to value range, difference due to the carbon carrying capacity of particulate matter trap, its regeneration temperature is not defined as a fixed value, but between a certain given zone, obviously, for reaching the object of particulate matter trap regeneration, the lower limit of this value range is not less than the particle burning that can make in particulate matter trap, to recover the temperature value of particulate matter trap trapping ability, for avoiding oxidizing catalytic converter, catalyzer scorification in particulate matter trap and selective catalysis converter, the CLV ceiling limit value of this value range is not more than the critical value of described catalyzer scorification.
It is pointed out that the fuel injection quantity relating to refers to the fuel injection quantity of diesel engine reprocessing ejecting system herein.
Above controlling method and the system of diesel particulate trap regeneration temperature provided by the present invention are all described in detail.Applied specific case herein principle of the present invention and mode of execution are set forth, above embodiment's explanation is just for helping to understand method of the present invention and core concept thereof.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (10)
1. a controlling method for the particulate matter trap regeneration temperature of diesel engine, described diesel engine comprises along waste gas streams to oxidizing catalytic converter and the particulate matter trap arranged successively, is provided with reprocessing diesel injection system before described oxidizing catalytic converter; It is characterized in that, described controlling method comprises the steps:
10) setting temperature and corresponding to the stable state correction fuel injection quantity of different exhaust air mass flow before default particulate matter trap;
20) according to true temperature in setting temperature and oxidizing catalytic converter before current exhaust air mass flow, particulate matter trap, determine when presteady state fuel injection quantity;
30) according to determining fuel injection quantity when presteady state correction after when presteady state fuel injection quantity and the stable state correction fuel injection quantity corresponding with current exhaust air mass flow, and export and fuel injection quantity is corresponding after presteady state correction fuel injection signal described reprocessing diesel injection system extremely;
40), according to the difference of true temperature before setting temperature before particulate matter trap and particulate matter trap, fuel injection quantity after presteady state correction is carried out to closed loop control.
2. controlling method as claimed in claim 1, is characterized in that, also presets the transient state modifying factor corresponding to different exhaust air mass flow variance ratio in step 10); Step 30) after, also comprise step:
31) according to fuel injection quantity after presteady state correction, the stable state correction fuel injection quantity that current exhaust air mass flow is corresponding, and the transient state modifying factor corresponding with current exhaust air mass flow variance ratio determine fuel injection quantity after current transient state correction, and the output fuel injection signal corresponding with fuel injection quantity after current transient state correction is to described reprocessing diesel injection system;
Step 40), in, according to the difference of true temperature before setting temperature before particulate matter trap and particulate matter trap, fuel injection quantity after the current transient state correction based on fuel injection quantity correction after presteady state correction is carried out to closed loop control.
3. controlling method as claimed in claim 2, is characterized in that step 31) in, after current transient state correction, fuel injection quantity is the long-pending stack of fuel injection quantity after presteady state correction and stable state correction fuel injection quantity and transient state modifying factor.
4. the controlling method as described in claims 1 to 3 any one, is characterized in that step 20) in, when the formula of presteady state fuel injection quantity is:
Wherein, q---as presteady state fuel injection quantity, mg/s;
M---current exhaust air mass flow, kg/h;
T
des---setting temperature before particulate matter trap, K;
T
doc---true temperature in oxidizing catalytic converter, K;
Cal---fuel oil heat-dissipating value, MJ/kg;
C
p, eg---the thermal capacitance of waste gas, J/(kgK).
5. the controlling method as described in claims 1 to 3 any one, is characterized in that step 30) in, after presteady state correction, fuel injection quantity is the stack when presteady state fuel injection quantity, the stable state correction fuel injection quantity corresponding with current exhaust air mass flow.
6. the controlling method as described in claims 1 to 3 any one, is characterized in that step 40) in closed loop control adopt PID to control.
7. a control system for the particulate matter trap regeneration temperature of diesel engine, described diesel engine comprises along waste gas streams to oxidizing catalytic converter and the particulate matter trap arranged successively, is provided with reprocessing diesel injection system before described oxidizing catalytic converter; It is characterized in that, described control system comprises:
Detection device: obtain true temperature and the front true temperature of particulate matter trap in current exhaust air mass flow, oxidizing catalytic converter;
Storage: setting temperature and corresponding to the stable state correction fuel injection quantity of different exhaust air mass flow before default particulate matter trap;
Controller: determine when presteady state fuel injection quantity according to true temperature in setting temperature and oxidizing catalytic converter before current exhaust air mass flow, particulate matter trap; And according to determining fuel injection quantity when presteady state correction after when presteady state fuel injection quantity and the stable state correction fuel injection quantity corresponding with current exhaust air mass flow, and output and fuel injection quantity is corresponding after presteady state correction fuel injection signal described reprocessing diesel injection system extremely; According to the difference of true temperature before setting temperature before particulate matter trap and particulate matter trap, fuel injection quantity after presteady state correction is carried out to closed loop control.
8. control system as claimed in claim 7, is characterized in that, described storage is the default transient state modifying factor corresponding to different exhaust air mass flow variance ratio also;
Described controller is determined after presteady state correction after fuel injection quantity, also according to fuel injection quantity after presteady state correction, the stable state correction fuel injection quantity that current exhaust air mass flow is corresponding, and transient state modifying factor corresponding to current exhaust air mass flow variance ratio determine fuel injection quantity after current transient state correction, and the output fuel injection signal corresponding with fuel injection quantity after current transient state correction is to described reprocessing diesel injection system; And according to the difference of true temperature before setting temperature before particulate matter trap and particulate matter trap, fuel injection quantity after the current transient state correction based on fuel injection quantity correction after presteady state correction is carried out to closed loop control.
9. control system as claimed in claim 7, is characterized in that, the module of carrying out closed loop control in described controller is pid control module.
10. the control system as described in claim 7 to 9 any one, is characterized in that, before described particulate matter trap, setting temperature is value range.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104929731A (en) * | 2015-05-05 | 2015-09-23 | 潍柴动力股份有限公司 | Regeneration control method and device of particulate matter trap |
| CN108487970A (en) * | 2018-02-05 | 2018-09-04 | 无锡沃尔福汽车技术有限公司 | For particle filtering capturing device regeneration stage temperature control equipment and computational methods |
| CN108798920A (en) * | 2018-06-29 | 2018-11-13 | 郑州精益达环保科技有限公司 | A kind of active oil jetting combustion regeneration DPF control strategies |
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