CN102128094B - The method and apparatus of setting air-fuel ratio in exhaust of internal combustion engine - Google Patents
The method and apparatus of setting air-fuel ratio in exhaust of internal combustion engine Download PDFInfo
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- CN102128094B CN102128094B CN201110021921.2A CN201110021921A CN102128094B CN 102128094 B CN102128094 B CN 102128094B CN 201110021921 A CN201110021921 A CN 201110021921A CN 102128094 B CN102128094 B CN 102128094B
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/141—Introducing closed-loop corrections characterised by the control or regulation method using a feed-forward control element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1413—Controller structures or design
- F02D2041/142—Controller structures or design using different types of control law in combination, e.g. adaptive combined with PID and sliding mode
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention discloses a kind of for air-fuel ratio in exhaust of internal combustion engine being set as predetermined λ set-point value λ
desmethod and apparatus, the upper and lower limit in λ interval of being wherein correlated with based on preset engine operating parameters determination fuel path, and determine that wider general restriction λ is interval.First make λ set-point value be limited to general limit section, and make it to be limited to fuel path subsequently and to be correlated with λ interval.The change of computing fuel metering is subsequently to make λ reach fuel path limit setting point value.In addition, the change of air and amount is calculated to make λ reach general limit setting point value.Described variable is set subsequently in the scope of feedforward term, and by any difference between PID regulator correction set-point value and actual value.The method disclosed in the present and device can coordinate the change of fuel and air metering best.
Description
[technical field]
The present invention relates to the method for the air fuel ratio in the exhaust of setting explosive motor, also relating to the device for performing the method.
[background technique]
The present invention can be combined with spark ignition Otto engine or diesel engine.In addition, multiple exhaust gas treatment device (such as three-way catalytic converter, NOx trap or diesel particulate filter) can be connected to engine downstream.Hereinafter can mention λ value, it represents the relative air fuel ratio of the deviation characterizing to burn with chemical dose (λ=1) generally.
Control to be usually very general measure to air fuel ratio in internal combustion engine exhaust gas, it is first for limiting emission (such as limiting the formation of soot in running at full capacity) and secondly for maintaining the performance of exhaust-gas treatment system, and such as, enrichment needed for regenerating in the three-way catalytic converter of spark ignition Otto engine or with NOx trap operates and combines.In addition, λ control also for by avoiding exothermic reaction to avoid the burning of unnecessary in such as diesel particulate filter soot to protect pump-down process assembly.
For these various control targets, often through the predetermined λ set-point value of advanced-design engine management system, subsequently by changing fuel and/or this λ value of air metering setting, and by it is regulated compared with the measured value (usually passing through lambda seeker) of λ value in exhaust.
The existing delay (such as due to exhaust pathway and sensor inertial) on path and adjustment situation difficult in the frequent transient engine operating mode occurred is regulated owing to considering, simple feedback regulation has been proved to be too slow and inaccuracy, therefore in order to the usual known use of this object is with the regulator of pilot control or feedforward term, change wherein first by regulating the fuel needed for the reverse model calculus of approximation in path required for λ set-point value and air to measure, and such as only revise the residue difference relative to actual value by PID regulator subsequently.
Required air fuel ratio is set by change fuel metering and air metering.Wherein, the change that the change of fuel metering is measured than air is faster on the impact of air fuel ratio in exhaust, the consequence that the normally preferred so that delay in make-up air path of the change of result fuel metering causes, particularly in transient engine operating mode.In addition, be generally used for the adjustment of fuel metering the deviation compensating fuel quantity in ejecting system, it may due to product tolerance or the reference value deviation to some extent of wearing and tearing and calibrating.
On the other hand, to the adjustment of λ, also there are some shortcomings by the change of fuel metering: obviously can not weaken burning quality; In addition, if explosive motor is just in transmission of drive force, then driver should be avoided to aware torque shock.In addition, delivery temperature should be limited, particularly for turbosupercharger.Finally, excessive oil dilution and too much fuel consumption should be avoided.
Although there are the problems referred to above, perform λ setting, especially for the quick change under transient engine operating mode mainly through fuel metering metering in the prior art.If properly, when deviation is relatively large, also adjustable air metering subsequently; But this will complete within the long period." review " to regulate to the what is called of air metering and can not change the fuel metering that above-mentioned and initial generation can occur in instantaneous conditions and changes this fact of the problem that is associated.
Therefore, target of the present invention is to provide a kind of setting or regulates the method and apparatus of air-fuel ratio in exhaust of internal combustion engine, and the method and device operate with the change coordinated fuel and air best and measure, and avoid the problems referred to above like this within the scope of maximum possible.Therefore, seek in control fuel metering (change for relatively little) and control to obtain best transformation continuously between air metering (changing for relatively large air fuel ratio).
[summary of the invention]
According to present invention achieves this object.
Advantageous conception of the present invention is described in the embodiment of the present invention.
In the method according to the invention, provide the following step, wherein if possible also can change the order of step:
From predetermined λ set-point value λ
desstart, first with lower limit λ
narrowminwith upper limit λ
narrowmaxdetermine what is called " fuel path be correlated with λ interval (fuel-path-relatedlambdainterval) ".Described interval characterizes the λ setting range that can obtain and maybe should obtain to avoid the problems referred to above by means of only change fuel metering.
Preferably according to the function of present engine operating mode (particularly according to the function of present engine rotating speed and load (or moment of torsion)) and preferably also determine the restriction in described λ interval based on prestore table memory or predefined function relation according to the function of engine temperature.Preferably also consider the operation mode (such as the regeneration operating etc. of lean-burn operation, stratified charge running (if any), NOx trap) of explosive motor, it is by the convergent-divergent relative to the basic value stored in the table, and deviant or the different forms by a series of function according to operation mode realize.Preferably λ interval does not rely on (or at least directly not relying on) in current λ value or predetermined λ set-point value.
In a preferred embodiment of the invention, also determine that another λ is interval based on preset engine operating parameters, this λ is interval hereinafter referred to as " general restriction λ interval (generallylimitedlambdainterval) ", and it is chosen as wider than fuel path restriction λ interval, and fuel path restriction λ interval is in this wider interval.Preferably predetermined λ set-point value is restricted to the value in described interval, that is, if set-point value is greater than interval limit value λ
broadmaxor be less than λ
broadmin, then set the interval limit value that described set-point value equals corresponding, described limit value is used as the set-point value of other step subsequently.By this restriction, be limited in significant scope by between absolute available λ setting district, and no matter it is changed by fuel supply or air supply changes and sets.
The determination (namely based on multiple engine parameter) be preferably similar to fuel path limit section determine described in wider general limit section.
The size in described two above-mentioned intervals take into account the standard described in background technique part.Such as, in each example, fuel path limit section is all selected very narrow making avoids the torque shock can discovered by driver.
In the method according to the invention, next step, be limited in the direction increased the upper limit λ that fuel path limits λ interval by making predetermined λ set-point value
narrowmax, and/or make predetermined λ set-point value reduce direction be limited to fuel path restriction λ interval lower limit λ
narrowmin, according to predetermined λ set-point value λ
desdetermine fuel path restriction λ set-point value λ
deslimK.Especially, if λ set-point value is greater than or equal to the λ value λ measured
mess, then preferably in the direction increased, λ set-point value is limited to upper limit λ
narrowmax.If λ set-point value is lower than the λ value λ measured
mess, then preferably in the direction reduced, λ set-point value is limited to lower limit λ
narrowmin.
To make, actual λ value is approximate reaches fuel path restriction λ set-point value λ subsequently
deslimKmode determine that required fuel quantity changes Δ m
k.
If original set point values λ
desbe in fuel path restriction λ interval, then λ
des(or λ
des lim) and λ
deslimKequal and only carry out λ setting based on fuel metering, and air quantity remains unchanged.
On the contrary, if λ set-point value λ
des(or λ
deslim, consider general limit section) and fuel path restriction λ set-point value λ
deslimKnot corresponding (i.e. λ
deslimKbe restricted), then as another step, to consider that the fuel quantity determined in previous steps changes Δ m
kactual λ value is made to reach λ set-point value λ
desor λ
deslimmode determine that required air quantity changes Δ m
l.
Finally, the above-mentioned changes values Δ m determined is considered
kwith Δ m
lif (properly) come setting air and fuel value so that (at least approximate) reaches λ set-point value λ
desor λ
deslim.
Preferably, can be used in especially in the situation with the adjustment of pilot control or feedforward term according to method of the present invention.For this reason, by said method, in each example, calculate the required change of fuel based on the reverse model of air/fuel system and air changes (if properly), and be set in the scope of pilot control or feedforward term.Current λ value λ is revised by regulating element (such as by PID regulator)
messwith λ set-point value λ
desbetween difference, wherein said PID regulator is main fuel metering metering preferably.
The invention also discloses a kind of device related to for performing the method.
The hardware aspect of this device designs in a manner well known in the art, and has other for controlling the driver (such as electric drive jet pump) of fuel metering and the driver (such as electronic throttle) for controlling air metering.Current λ value is measured by lambda seeker corresponding in exhaust.
Preferably perform in the control unit of engine of Microprocessor S3C44B0X according to method of the present invention, it receives required λ set-point value according to the input variable from high-order controller.Form enforcement said method like this preferably by program-code and by prestoring accordingly.
According to another aspect of the present invention, a kind of method controlling air-fuel ratio in exhaust of internal combustion engine is provided.The method comprise regulate transfer in the air of motor and fuel each with by air-fuel ration control for predetermined required air fuel ratio, wherein certain limit is limited in the adjustment of fuel, if to the unrealized predetermined required air fuel ratio of the adjustment of fuel, then regulated air based on actual mixing ratio and the predetermined required deviation of air fuel ratio and the fuel adjusting of limited extent.
In one embodiment, based on fuel path, air-fuel ratio set point value is limited to the adjustment of fuel, and regulate the fuel quantity transferring to motor to realize fuel path restriction air-fuel ratio set point value.
In another embodiment, based on fuel path, air-fuel ratio set point value is limited to the adjustment of fuel, and regulate the fuel quantity transferring to motor to realize fuel path restriction air-fuel ratio set point value; And to the adjustment of air based on described fuel adjusting and described predetermined required air fuel ratio.
[embodiment]
To again explain according to one embodiment of present invention in more detail below:
1) first by λ
desbe predefined for set-point value and measure current λ value λ
mess.
2) based on table memory (tablememory), define two λ scopes according to Engine torque and the function of rotating speed and the function of operation mode especially, be in particular wider general limited field and (be limited to λ up and down
broadminand λ
broadmax) and the fuel path limited field of relative narrower (limit value is λ
narrowminand λ
narrowmax).Fuel path limited field is (only) should change the λ scope of set-point value by fuel path.
3) according to λ
des, first determine according to following equations the first set-point value λ being limited to general limited field
deslim
λ
deslim＝max(min(λ
des，λ
broadmax)，λ
broadmin)(1)
Described restriction is guaranteed in air/fuel metering, limited change only to occur between feedforward validation period after a while.
4) in addition, restricted more set-point value λ is determined
deslimK, which characterizes can by the maximum change of fuel path, specific as follows:
If 3) in the value λ that determines
deslimgreater than or equal to the λ value λ measured
mess, then by λ
deslim kbe set as and λ
deslimequal, but be limited to the upper limit λ compared with close limit in the direction increased
narrowmax, namely
λ
deslimK＝min(λ
deslim，λ
narrowmax)(2)
If or in step 3) in the value λ that determines
deslimbe less than the λ value λ of measurement
mess, then by λ
des limKbe set as and λ
deslimequal, but be limited to the lower limit λ compared with close limit in the direction reduced
narrowmin, namely
λ
deslimK＝max(λ
deslim，λ
narrowmin)(3).
5) calculate according to following equations the fuel limit setting point value λ λ value of measurement being set as determining above subsequently
deslimKrequired fuel compensation,
Wherein
Δ m
kfor fuel mass flow rates changes; m
lfor MAF; λ
precalfor pre-calibration λ value.
Uncompensated feedforward change according to air and fuel path calculates pre-calibration λ value λ
precal.
6) subsequently, according to following equations calculate MAF other needed for revise Δ m
l,
Δm
L＝(λ
deslimK-λ
Precal)·m
KPrecal·14.7+λ
deslim·Δm
K·14.7(5)
Wherein m
kPrecalfor λ
precalbased on fuel mass flow rates.
7) last, the air of pilot control in an appropriate manner and fuel value will be revised by feedforward further based on measured value λ
mess(such as by PID regulating element) is regulated to be set-point value λ
des.
In one example, with in the explosive motor of NOx trap, the regeneration of described NOx trap needs the λ value of such as 0.97 (enrichment).In this case, fuel path limit section can be between 1.08 and 1.10.If current λ value is 1.09, then perform the change from 1.09 to 1.08 by fuel path, and perform the change from 1.08 to 0.97 by air path.
Claims (8)
1. one kind for by the air-fuel ratio set in internal combustion engine exhaust gas being predetermined λ set-point value λ
desmethod, it is characterized in that:
A) be correlated with based on predetermined engine running parameter determination fuel path the lower limit λ in λ interval
narrowminwith upper limit λ
narrowmax;
B) by making described predetermined λ set-point value be limited in the direction increased the upper limit λ that fuel path limits λ interval
narrowmaxand/or make described predetermined λ set-point value be limited to the lower limit λ in described fuel path restriction λ interval in the direction reduced
narrowmin, according to described predetermined λ set-point value λ
desdetermine fuel path restriction λ set-point value λ
deslimK;
C) to make actual λ value reach described fuel path restriction λ set-point value λ
deslimKthe change Δ m of mode determination fuel quantity
k;
If d) described λ set-point value λ
deswith described fuel path restriction λ set-point value λ
deslimKnot corresponding, then to consider step c) in the change of described fuel quantity determined and make described actual λ value reach described λ set-point value λ
desthe change Δ m of mode determination air quantity
l; And
E) described changes values Δ m is considered
kand/or Δ m
l, set described air and fuel value to make it reach described λ set-point value λ
des.
2., according to the method described in claim 1, it is characterized in that:
Based on preset engine operating parameters, determine the lower limit λ generally limiting λ interval
broadminwith upper limit λ
broadmax, described general restriction λ is interval wider than described fuel path restriction λ interval and be contained in wherein in described fuel path restriction λ interval, and wherein for step a) to e), use limited λ set-point value λ
deslimreplace described predetermined λ set-point value λ
des, described limited λ set-point value λ
deslimbe limited to the λ value in described general restriction λ interval.
3., according to the method described in claim 2, it is characterized in that:
Interval and/or the described general restriction λ interval of described fuel path restriction λ is determined based on prestore form and/or presaved function relation according to the function of at least one parameter in the group of engine speed, engine loading or Engine torque, engine operation modes and/or engine temperature.
4. method according to claim 2, it is characterized in that, determine the interval and/or described general restriction λ interval of described fuel path restriction λ according to the function of at least one parameter in the group of engine speed, engine loading or Engine torque, engine operation modes and/or engine temperature based on prestore form and/or presaved function relation, wherein said engine operation modes is the regeneration mode of combustion mode or exhaust gas treatment device.
5. method according to claim 3, is characterized in that, described engine operation modes comprises the regeneration mode of combustion mode, exhaust gas treatment device.
6. method according to any one of claim 1 to 5, is characterized in that:
Measure current λ value λ
mess, and based on described current λ value λ
messbe described λ set-point value λ with pilot control or feedforward term by described air-fuel ratio regulation
des, wherein based on the reverse model calculation procedure c of described air/fuel system) and d) in required fuel and air change and be set in the scope of described pilot control or feedforward term, and wherein by current λ value λ described in regulating element correction
messwith described λ set-point value λ
desbetween difference.
7. method according to claim 6, is characterized in that: in step b) in,
If described λ set-point value is greater than or equal to the λ value λ of described measurement
mess, then make described λ set-point value be limited to described fuel path in the direction increased and to be correlated with the upper limit λ in λ interval
narrowmax, and
If described λ set-point value is less than the λ value λ of described measurement
mess, then make described λ set-point value be limited to described fuel path in the direction reduced and to be correlated with the lower limit λ in λ interval
narrowmin.
8., for setting and/or regulate a device for the air fuel ratio in internal combustion engine exhaust gas, it is characterized in that:
Described apparatus design is used for the method for enforcement of rights requirement according to any one of 1-7.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE201010000928 DE102010000928B3 (en) | 2010-01-15 | 2010-01-15 | Method for approximately adjusting air/fuel ratio in exhaust gas of e.g. diesel engine, involves determining fuel path reference lambda value, and adjusting air/fuel ratio under consideration of values for reaching lambda-set value |
| DE102010000928.8 | 2010-01-15 |
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| Publication Number | Publication Date |
|---|---|
| CN102128094A CN102128094A (en) | 2011-07-20 |
| CN102128094B true CN102128094B (en) | 2015-12-16 |
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| CN201110021921.2A Active CN102128094B (en) | 2010-01-15 | 2011-01-14 | The method and apparatus of setting air-fuel ratio in exhaust of internal combustion engine |
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| DE (1) | DE102010000928B3 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8862370B2 (en) * | 2012-08-02 | 2014-10-14 | Ford Global Technologies, Llc | NOx control during engine idle-stop operations |
| DE102013218903A1 (en) * | 2013-09-20 | 2015-03-26 | Robert Bosch Gmbh | Method and device for lambda and ignition angle control |
| CN105020042A (en) * | 2014-04-29 | 2015-11-04 | 长城汽车股份有限公司 | Method for controlling dual-fuel engine based on air-fuel ratio, system and vehicle |
| CN104847509B (en) * | 2015-06-11 | 2018-03-20 | 安徽江淮汽车集团股份有限公司 | The delivery temperature control method and exhaust temperature control device of TGDI engines |
| DE202015004385U1 (en) * | 2015-06-20 | 2016-11-02 | GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) | Computer program for operating a drive system |
| DE102019101680A1 (en) | 2019-01-24 | 2020-07-30 | Bayerische Motoren Werke Aktiengesellschaft | Method for correcting deviations in an air mass or exhaust gas recirculation rate and injection quantity in an internal combustion engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH09242587A (en) * | 1996-03-08 | 1997-09-16 | Suzuki Motor Corp | Air-fuel ratio control device for internal combustion engine |
| JPH11182296A (en) * | 1997-12-18 | 1999-07-06 | Toyota Motor Corp | Air-fuel ratio control device for internal combustion engine |
| JP2004036396A (en) * | 2002-06-28 | 2004-02-05 | Hitachi Unisia Automotive Ltd | Air fuel ratio control device of internal combustion engine |
| EP2163751A1 (en) * | 2003-04-22 | 2010-03-17 | Toyota Jidosha Kabusiki Kaisha | Air/fuel ratio control device for internal combustion engine |
| DE102006053104B4 (en) * | 2006-11-10 | 2019-10-31 | Robert Bosch Gmbh | Method for adapting a map |
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| Publication number | Publication date |
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| CN102128094A (en) | 2011-07-20 |
| DE102010000928B3 (en) | 2011-06-16 |
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