CN106202703B - Internal combustion engine based on air-fuel ratio weighting suddenly accelerates (load) scheme optimization method - Google Patents
Internal combustion engine based on air-fuel ratio weighting suddenly accelerates (load) scheme optimization method Download PDFInfo
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Abstract
The purpose of the present invention is to provide the internal combustion engines weighted based on air-fuel ratio suddenly to accelerate (load) scheme optimization method, first by the initial anxious electronic control system accelerated outside the write-in of (load) scheme given by man, then the excess air ratio of initial acceleration scheme lower different moments is obtained by experiment or simulation calculation, and by obtained excess air ratio write-in outside electronic control system, all data can be passed to air-fuel ratio weighting algorithm module by last external electronic control system, and the rotating speed of target (load) after the air-fuel ratio weighted optimization of output is encapsulated into ECU control system.ECU control system can be according to acceleration (load) process of rotating speed of target (load) the control internal combustion engine obtained after weighted optimization.The present invention can be effectively improved internal combustion engine and world today's energy shortage, the realistic problems such as environment worsening are effectively relieved the time required to shortening anxious acceleration (load) in anxious power, the emission performance for accelerating (load) process.
Description
Technical field
The present invention relates to a kind of internal combustion engine control method, specifically internal combustion engine it is anxious accelerate, anxious load when
Optimization method.
Background technique
Internal combustion engine carries the mission for converting fossil energy to mechanical work, due to its higher thermal efficiency and powerful
Dynamic property makes it be widely used.Up to the present, moveable higher than internal combustion engine there are no system thermal efficiency is found
Power device, in the military vehicles such as automobile, agricultural machinery, engineering machinery, naval vessel, locomotive, tank armor vehicle, internal combustion engine is firmly kept
The status of best prime mover, has overwhelming superiority.Since the late 19th century, the appearance of gasoline engine and diesel engine until today,
Internal combustion engine changes the every aspect of human lives, becomes the powerful engine for pushing modern industrial civilization development.Due to its turn
Speed and load be not it is unalterable, in order to complete specific function, internal combustion engine has the feelings for accelerating suddenly or loading suddenly
Condition.When internal combustion engine is in anxious acceleration (load), if it is accelerated (load) according to given initial acceleration (load) scheme,
It may will appear that interim soot emissions are excessive, row's temperature is excessively high, effective fuel consumption is excessive, excess air ratio during the acceleration (load)
The problems such as too low, after-burning is seriously and mechanical load and thermic load are excessive, however for acceleration (load) process, air-fuel ratio determines most
Big fuel burning amount, therefore air-fuel ratio also becomes the key constraints of acceleration (load) response.Target is turned by air-fuel ratio
Fast (load) is weighted optimization, and internal combustion engine is made to be accelerated or be added according to the rotating speed of target (load) after air-fuel ratio weighted optimization
Load can effectively be alleviated due to the too large or too small caused above problem of air-fuel ratio.
Summary of the invention
The purpose of the present invention is to provide can be very good to improve, interim air-fuel ratio is too low, effective specific fuel consumption mistake
Height, soot emissions are excessive, arrange weighting based on air-fuel ratio for a series of problems, such as warm excessively high and mechanical load and thermic load being excessive
Internal combustion engine suddenly accelerate (load) scheme optimization method.
The object of the present invention is achieved like this:
The present invention is based on the internal combustion engines of air-fuel ratio weighting suddenly to accelerate (load) scheme optimization method, it is characterized in that:
Internal combustion engine is when suddenly accelerating:
(1) the initial acceleration scheme of internal combustion engine is given；
(2) the rotating speed of target rate of acceleration of initial different moments, calculation formula are calculated are as follows:
Target_speed_rate (i)=(target_speed (i)-target_speed (i-1))/(t (i)-t (i-
1)),
Wherein target_speed_rate (i) is the rotating speed of target rate of acceleration of initial different moments,
Target_speed (i), target_speed (i-1) are the initial target turn at the i-th moment and the (i-1)-th moment
Speed, t (i), t (i-1) were respectively the i-th and (i-1)-th moment；
(3) excess air ratio of initial acceleration scheme lower different moments is obtained by experiment or simulation calculation
(4) the weight q (i) of theoretical air-fuel ratio weighting: whenWhen, enable weight q (i)=α；WhenWhen, enable weightWhenWhen, enabling weight q (i) is 1, and wherein α is 2-3
Between algebraic variable；
(5) the rotating speed of target rate of acceleration of different moments, calculation formula after theoretical air-fuel ratio weights are as follows:
Target_speed_rate_1 (i)=(q (i)-β) * target_speed_rate (i), wherein
Target_speed_rate_1 (i) is the rotating speed of target rate of acceleration of different moments after air-fuel ratio weighting, and q (i) is not
Air-fuel ratio in the same time weights weight, and target_speed_rate (i) is the initial target revolving speed rate of acceleration of different moments, and β is
Weight adjusts item；
(6) rotating speed of target of different moments, calculation formula after theoretical air-fuel ratio weights are as follows:
Target_speed-1 (i)=target_speed_rate_1 (i) * (t (i)-t (i-1))+target_speed_
1 (i-1),
Wherein target_speed_1 (i) is the rotating speed of target of different moments after air-fuel ratio weighting, target_speed_
Rate_1 (i) is the rotating speed of target rate of acceleration of different moments after air-fuel ratio weighting, when target_speed_1 (i-1) is (i-1)-th
Rotating speed of target after carving air-fuel ratio weighting；
(7) amendment of the rotating speed of target after air-fuel ratio weighting, it is ensured that the final rotating speed of target in air-fuel ratio weighting front and back is identical.
Correction formula are as follows:
Target_speed_2 (i)=(target_speed_1 (i)-min (target_speed_1 (i)))/(max
(target_speed_1(i))-min(target_speed_1(i)))*(b-a)+a；,
Wherein target_speed_1 (i) is the rotating speed of target of the different moments obtained after air-fuel ratio weights, min
(targer_speed_1 (i)) is the minimum value of the rotating speed of target of the different moments obtained after air-fuel ratio weights, max (targer_
Speed_1 (i)) be the rotating speed of target of different moments obtained after air-fuel ratio weighting maximum value, b be initial target revolving speed most
Big value, a are the minimum value of initial target revolving speed；
(8) on the basis of the rotating speed of target obtained after the weighting of this air-fuel ratio, judged by experiment or simulation calculation
Whether internal combustion engine performance indexes parameter reaches preset requirement, if reaching preset requirement, optimization terminates；If not up to
Preset requirement is then turned using the excess air ratio and rotating speed of target that currently obtain as initial excess air ratio and initial target
Speed is transferred to step (4).
The present invention may also include:
1, internal combustion engine is in suddenly load:
(1) the initial loading scheme of internal combustion engine is given；
(2) the targeted loads increment rate of initial different moments, calculation formula are calculated are as follows: target_load_rate (i)=
(targey_load (i)-target_load (i-1))/(t (i)-t (i-1)), wherein target_load_rate (i) is initial
The targeted loads increment rate of different moments, target_load (i), target_load (i-1) are the i-th moment and the (i-1)-th moment
Initial target load, t (i), t (i-1) were respectively the i-th and (i-1)-th moment；
(3) excess air ratio of initial acceleration scheme lower different moments is obtained by experiment or simulation calculation
(4) the weight q (i) of theoretical air-fuel ratio weighting: whenWhen, enable weight q (i)=α；WhenWhen, enable weight When, enable weight q (i) be 1, wherein α be 2-3 it
Between algebraic variable；
(5) the targeted loads increment rate of different moments, calculation formula after theoretical air-fuel ratio weights are as follows:
Target_load_rate_1 (i)=(q (i)-β) * target_load_rate (i), wherein target_load_
Rate_1 (i) is the targeted loads increment rate of different moments after air-fuel ratio weighting, and q (i) is that the air-fuel ratio of different moments weights power
Weight, target_load_rate (i) are the initial load increment rate of different moments, and β is that weight adjusts item；
(6) targeted loads of different moments, calculation formula after theoretical air-fuel ratio weights are as follows:
Target_load_1 (i)=target_load_rate_1 (i) * (t (i)-t (i-1))+target_load_1
(i-1)
, wherein target_load_1 (i) is the targeted loads of different moments after air-fuel ratio weighting, target_load_
Rate_1 (i) is the targeted loads increment rate of different moments after air-fuel ratio weighting, and target_load_1 (i-1) was the (i-1)-th moment
Targeted loads after air-fuel ratio weighting；
(7) amendment of the targeted loads after air-fuel ratio weighting, it is ensured that the final targeted loads in air-fuel ratio weighting front and back are identical,
Correction formula are as follows:
Target_load-2 (i)=(target_load1 (i)-min (target_load_1 (i)))/(max
(target_load_1(i))-min(target_load-1(i)))*(b-a)+a；
Wherein target_load_rate_1 (i) is the targeted loads of the different moments obtained after air-fuel ratio weighted optimization,
Minimum value of the min (target_load_1 (i)) for the targeted loads of the different moments obtained after air-fuel ratio weighted optimization, max
It (targer_load_1) is the maximum value of the targeted loads of the different moments obtained after air-fuel ratio weighted optimization, b is initial target
The maximum value of load, a are the minimum value of initial target load；
(8) on the basis of the targeted loads obtained after the weighting of this air-fuel ratio, judged by experiment or simulation calculation
Whether internal combustion engine performance indexes parameter reaches preset requirement, if reaching preset requirement, optimization terminates；If not up to pre-
If requirement turn using the excess air ratio that currently obtains and rotating speed of target as initial excess air ratio and initial target revolving speed
Enter step (4).
Present invention has an advantage that
1, initial acceleration (load) is effectively improved in the process due to the too large or too small caused internal combustion engine work of air-fuel ratio
As when the interim soot emissions that occur are excessive, row's temperature is excessively high, effective fuel consumption is excessive, excess air ratio is too low, roughness noise, machine
The problems such as tool load and excessive thermic load.
2, it significantly improves internal combustion engine to accelerate dynamic property and accelerate ride comfort, also helps internal combustion engine at the same time and add
Energy-saving and emission-reduction during speed to the energy crisis for alleviating the world today and improve environment for the survival of mankind with very heavy
The realistic meaning wanted.
Detailed description of the invention
Fig. 1 is system block diagram of the invention；
Fig. 2 is flow diagram of the invention.
Specific embodiment
It illustrates with reference to the accompanying drawing and the present invention is described in more detail:
In conjunction with Fig. 1-2, this Optimum Design System scheme as shown in Figure 1, include a diesel engine, a set of turbocharger,
Air inlet system and exhaust system, signal acquisition unit, shaft end load, fuel oil supply system, interface unit and ECU control system.Wherein ECU
Rotating speed of target (load) and electron speed regulator module after encapsulating air-fuel ratio weighted optimization inside control system.Intake and exhaust system
System, fuel oil supply system, signal acquisition unit, shaft end load etc. are connected by interface unit with ECU control system respectively.Signal
Acquisition unit include intake flow sensor, exhaust gas temperature sensor, smokemetor, exhaust oxygen content detector, NOxContent inspection
Instrument is surveyed, for real-time monitoring Induction air flow, delivery temperature, exhaust smoke, exhaust NOxThe parameters such as content and air-fuel ratio
Value, it is ensured that diesel engine various performance parameters during anxious acceleration (load) are no more than limit value.It is excellent in order to obtain air-fuel ratio weighting
The rotating speed of target (load) obtained after change, first by the initial anxious electronic control accelerated outside the write-in of (load) scheme given by man
Then system obtains the excess air ratio of initial acceleration scheme lower different moments by experiment or simulation calculation, and will obtain
The external electronic control system of excess air ratio write-in, it is last outside electronic control system all data can be passed to
Air-fuel ratio weighting algorithm module, and the rotating speed of target (load) after the air-fuel ratio weighted optimization of output is encapsulated into ECU control system
System.Electron speed regulator after internal combustion engine ECU control system receives the anxious signal for accelerating (load), inside ECU control system
Module can target after actual speed (load) to internal combustion engine and the air-fuel ratio weighted optimization that is stored in inside ECU control system
Revolving speed (load) is compared, and the difference between the two is simply handled, and then transmits as electronic signals
Executing agency (fuel oil supply system) is given, the fuel supply volume by changing fuel oil supply system makes diesel engine according to weighted optimization
Rotating speed of target (load) afterwards carries out anxious acceleration (load), so as to improve diesel engine when carrying out anxious load (speed), due to air-fuel ratio
Interim soot emissions are excessive caused by too large or too small, fuel consumption rate is excessively high, arrange warm excessively high, roughness noise and machinery
The problems such as load and excessive thermic load.
Core of the invention and innovative point be using the rotating speed of target (load) after air-fuel ratio weighting algorithm solving optimization,
Be described in detail below internal combustion engine when suddenly accelerating or anxious load using after air-fuel ratio weighting algorithm solving optimization rotating speed of target or
Detailed implementation steps when targeted loads.
When suddenly accelerating, using the rotating speed of target after air-fuel ratio weighting algorithm solving optimization, specific step is as follows:
Step 1. people is the initial acceleration scheme of given internal combustion engine.
Step 2. calculates the rotating speed of target rate of acceleration of initial different moments.Calculation formula are as follows:
Target_speed_rate (i)=(target_speed (i)-target_speed (i-1))/(t (i)-t (i-
1)),
Wherein target_speed_rate (i) is the rotating speed of target rate of acceleration of initial different moments,
Target_speed (i), target_speed (i-1) are the initial target turn at the i-th moment and the (i-1)-th moment
Speed, t (i), t (i-1) were respectively the i-th and (i-1)-th moment.
Step 3. obtains the excess air ratio of initial acceleration scheme lower different moments by experiment or simulation calculation
The weight q (i) of step 4. theoretical air-fuel ratio weighting.WhenWhen, enable weight q (i)=α；WhenWhen, enable weightWhenWhen, enabling weight q (i) is 1, and wherein α is one
Algebraic variable (is generally defaulted as some constant between 2-3).
The rotating speed of target rate of acceleration of different moments after step 5. theoretical air-fuel ratio weighted optimization.Calculation formula are as follows:
Target_speed_rate_1 (i)=(q (i)-β) * target_speed_rate (i), wherein target_
Speed_rate_1 (i) is the rotating speed of target rate of acceleration of different moments after air-fuel ratio weighted optimization, and q (i) is the sky of different moments
Than weighting weight, target_speed_rate (i) is the initial target revolving speed rate of acceleration of different moments for combustion, and β is that weight adjusts item
(being generally defaulted as being greater than 0 some constant less than 1).
The rotating speed of target of different moments after step 6. theoretical air-fuel ratio weighted optimization.Calculation formula are as follows:
Target_speed_1 (i)=target_speed_rate_1 (i) * (t (i)-t (i-1))+target_speed-
1 (i-1),
Wherein target_speed_1 (i) is the rotating speed of target of different moments after air-fuel ratio weighted optimization, target_
Speed_rate_1 (i) is the rotating speed of target rate of acceleration of different moments after air-fuel ratio weighted optimization, target_speed_1 (i-
It 1) is the rotating speed of target after the (i-1)-th moment air-fuel ratio weighted optimization, it is assumed that the mesh after initial air-fuel ratio weighted optimization
Mark revolving speed is a.
The amendment of rotating speed of target after the weighting of step 7. air-fuel ratio, it is ensured that final target turns before and after air-fuel ratio weighted optimization
Speed is identical.Correction formula are as follows:
Target_speed_2 (i)=(target_speed-1 (i)-min (target_speed_1 (i)))/(max
(target_speed_1(i))-min(target_speed_1(i)))*(b-a)+a；
Wherein target_speed_1 (i) is the rotating speed of target of the different moments obtained after air-fuel ratio weighted optimization, min
The minimum value of (target_speed_1 (i)) for the rotating speed of target of the different moments obtained after air-fuel ratio weighted optimization, max
(target_speed_1 (i)) is the maximum value of the rotating speed of target of the different moments obtained after air-fuel ratio weighted optimization, and b is initial
The maximum value of rotating speed of target, a are the minimum value of initial target revolving speed.
On the basis of the rotating speed of target that step 8. obtains after first time air-fuel ratio weighted optimization, by testing or emulating
Calculating judges whether internal combustion engine performance indexes parameter reaches requirement (or convergence), if reaching requirement (or convergence), calculates knot
Beam；If not up to requiring (or convergence), using the excess air ratio that currently obtains and rotating speed of target as initial excess air ratio and
Initial target revolving speed, is transferred to step 4.
In suddenly load, using the targeted loads after air-fuel ratio weighting algorithm solving optimization, specific step is as follows:
Step 1. people is the initial loading scheme of given internal combustion engine.
Step 2. calculates the targeted loads increment rate of initial different moments.Calculation formula are as follows:
Target_load_rate (i)=(target_load (i)-target_load (i-1))/(t (i)-t (i-1))
Wherein target_load_rate (i) is the targeted loads increment rate of initial different moments,
Target_load (i), target_load (i-1) are the initial target load at the i-th moment and the (i-1)-th moment, t
(i), t (i-1) was respectively the i-th and (i-1)-th moment.
Step 3. obtains the excess air ratio of initial acceleration scheme lower different moments by experiment or simulation calculation
The weight q (i) of step 4. theoretical air-fuel ratio weighting.WhenWhen, enable weight q (i)=α；WhenWhen, enable weight When, enabling weight q (i) is 1, and wherein α is a generation
Number variable (is generally defaulted as some constant between 2-3).
The targeted loads increment rate of different moments after step 5. theoretical air-fuel ratio weighted optimization.Calculation formula are as follows:
Target_load_rate_1 (i)=(q (i)-β) * target_load_rate (i), wherein
Target_load_rate_1 (i) is the targeted loads increment rate of different moments after air-fuel ratio weighted optimization, q (i)
Weight is weighted for the air-fuel ratio of different moments, target_load_rate (i) is the initial load increment rate of different moments, and β is
Weight adjustment item (is generally defaulted as being greater than 0 some constant less than 1).
The targeted loads of different moments after step 6. theoretical air-fuel ratio weighted optimization.Calculation formula are as follows:
Target_load_1 (i)=target_load_rate_1 (i) * (t (i)-t (i-1))+target_load_1
(i-1)
, wherein target_load_1 (i) is the targeted loads of different moments after air-fuel ratio weighted optimization, target_
Load_rate_1 (i) is the targeted loads increment rate of different moments after air-fuel ratio weighted optimization, and target_load_1 (i-1) is
Targeted loads after (i-1)-th moment air-fuel ratio weighted optimization, it is assumed that the target after initial air-fuel ratio weighted optimization is negative
Carrying is a.
The amendment of targeted loads after step 7. air-fuel ratio weighted optimization, it is ensured that final mesh before and after air-fuel ratio weighted optimization
Mark load is identical.Correction formula are as follows:
Target_load_2 (i)=(target_load1 (i)-min (target_load_1 (i)))/(max
(target_load_1(i))-min(target_load_1(i)))*(b-a)+a；
Wherein target_load_rate_1 (i) is the targeted loads of the different moments obtained after air-fuel ratio weighted optimization,
Minimum value of the min (target_load_1 (i)) for the targeted loads of the different moments obtained after air-fuel ratio weighted optimization, max
It (targer_load_1) is the maximum value of the targeted loads of the different moments obtained after air-fuel ratio weighted optimization, b is initial target
The maximum value of load, a are the minimum value of initial target load.
On the basis of the targeted loads that step 8. obtains after first time air-fuel ratio weighted optimization, by testing or emulating
Calculating judges whether internal combustion engine performance indexes parameter reaches requirement (or convergence), if reaching requirement (or convergence), calculates knot
Beam；If not up to requiring (or convergence), using the excess air ratio that currently obtains and rotating speed of target as initial excess air ratio and
Initial target revolving speed, is transferred to step 4.
Proposed by the present invention be weighted by air-fuel ratio to rotating speed of target (load) realizes that internal combustion engine suddenly accelerates (load) mistake
The method of Cheng Xingneng optimization can effectively improve internal combustion engine and suddenly accelerate under the premise of not needing to add other accessories
During (load) due to air-fuel ratio it is interim it is too large or too small caused by its interim soot emissions are excessive, row's temperature is excessively high, have
Imitate a series of field of internal combustion engine questions of common concern such as oil consumption is excessive, mechanical load and thermic load are excessive.To raising internal combustion
Machine accelerates dynamic property and accelerates ride comfort, internal combustion engine is promoted suddenly to accelerate the energy-saving and emission-reduction during (load), alleviates the world today
Energy crisis and improve environment for the survival of mankind and be all of great practical significance.
The concrete principle of air-fuel ratio weighting algorithm is as follows:
For acceleration (load) process, air-fuel ratio determines maximum fuel quantity combusted, and becoming, which influences internal combustion engine, accelerates (load) response
A key factor.The too small air-fuel mixture that will lead to of excess air ratio is uneven, and high temperature region is increased, and soot emissions are tight
Weight, fuel consumption rate increase, thermal efficiency decline；Excess air ratio is excessive, or causes gaseous mixture excessive rarefied, high-temperature oxygen-enriched region
Increase, the burning velocity for early period of burning greatly declines, and after-burning is serious, and mechanical load and thermic load are excessive, is unfavorable for internal combustion engine
Operation.Air-fuel ratio weighted optimization is exactly to pass through air-fuel ratio to be weighted optimization to rotating speed of target (load), make internal combustion engine according to
When anxious acceleration (load) scheme after optimization accelerates (load), the excess air ratio of different moments is unlikely to too large or too small, thus
Improve the running a series of problem occurred of diesel engine.In air-fuel ratio weighting algorithm, according to initial acceleration (load) scheme
The excess air ratio of middle different moments sets different weight q (i), will lead to air-fuel ratio weighting since excess air ratio is excessive
Weight is excessive, and revolving speed rate of acceleration (rate of load growth) mutually strains excessive, and then causes distributive value excessive, burns in combustion process
Roughly, highest detonation pressure transfinite, mechanical and thermic load it is excessive, the performance indicator for not being able to satisfy internal combustion engine operation needs to repeat to weight excellent
Change；The too small weight that will lead to air-fuel ratio weighting of excess air ratio is too small, the mistake that revolving speed rate of acceleration (rate of load growth) mutually strains
It is small, and then cause the rate of iteration convergence lower (result accuracy is also poor), in order to meet the indices of internal combustion engine operation,
The number of iterations need to be increased.In order to reduce the number of iterations, the properties that internal combustion engine suddenly accelerates (load) scheme are effectively improved, it will wherein
α be set as a geometry variable, generally default 2≤α≤3.It is as short as possible the time required in order to guarantee anxious acceleration (load) process, excessive
Rotating speed of target (load) acceleration (load) rate of air coefficient always in suitable range and after optimization is always positive value.Weight
Adjustment item is generally defaulted as one and is greater than the 0 a certain constant less than 1.For the internal combustion engine equipped with booster, when internal combustion engine is pressed
When suddenly accelerating (load) according to initial speeding scheme, distributive value is instantly increased, however since the hysteresis phenomenon of compressor leads to air inlet
Amount cannot accomplish to be instantly increased that will lead to excess air ratio so too small；When internal combustion engine reaches higher revolving speed (load),
Exhaust energy increases, and the energy that turbine obtains is increase accordingly, and the acting ability of compressor also will increase, the air stream after compressor
Amount and pressure increase rapidly, and excess air ratio can become very big, and fluctuation is violent.Air-fuel ratio weighted optimization can be very good improve by
The problems such as stage soot emissions caused by excess air ratio fluctuation acutely are excessive, row's temperature is excessively high, effective fuel consumption is excessive.
The innovation of the invention consists in that it is (negative to encapsulate the rotating speed of target after air-fuel ratio weighted optimization inside ECU control system
It carries).In order to obtain the rotating speed of target obtained after air-fuel ratio weighted optimization (load), first by initial anxious acceleration given by man
Then electronic control system outside the write-in of (load) scheme is obtained different under initial acceleration scheme by experiment or simulation calculation
The excess air ratio at moment, and the electronic control system that the write-in of obtained excess air ratio is external, it is last outside electronics control
All data can be passed to air-fuel ratio weighting algorithm module by system processed, and by the target after the air-fuel ratio weighted optimization of output
Revolving speed (load) is encapsulated into ECU control system.ECU control system can be according to the rotating speed of target (load) obtained after weighted optimization
Control acceleration (load) process of internal combustion engine.The acquisition process of rotating speed of target (load) is the design of air-fuel ratio weighted optimization after optimization
The most key a part.The fuel delivery sprayed into cylinder that ECU control system passes through control IC engine fuel supply system
Amount accelerates internal combustion engine (load) according to the rotating speed of target (load) after optimization, can be effectively improved it in this way and add according to initial
The a series of interim soot emissions that fast (load) scheme is likely to occur when suddenly accelerating (load) are excessive, arrange warm excessively high, effective fuel consumption
Excessive, the problems such as excess air ratio is too low and mechanical load and thermic load are excessive.
Claims (2)
1. the internal combustion engine based on air-fuel ratio weighting suddenly accelerates and anxious loading scheme optimization method, it is characterized in that:
Internal combustion engine is when suddenly accelerating:
(1) the initial acceleration scheme of internal combustion engine is given；
(2) the rotating speed of target rate of acceleration of initial different moments, calculation formula are calculated are as follows:
Target_speed_rate (i)=(target_speed (i)-target_speed (i-1))/(t (i)-t (i-1)),
Wherein target_speed_rate (i) be initial different moments rotating speed of target rate of acceleration, target_speed (i),
Target_speed (i-1) be the i-th moment and the (i-1)-th moment initial rotating speed of target, t (i), t (i-1) be respectively i-th and
(i-1)-th moment；
(3) excess air ratio of initial acceleration scheme lower different moments is obtained by experiment or simulation calculation
(4) the weight q (i) of theoretical air-fuel ratio weighting: whenWhen, enable weight q (i)=α；When
When, enable weightWhenWhen, enabling weight q (i) is 1, wherein algebraic variable of the α between 2-3；
(5) the rotating speed of target rate of acceleration of different moments, calculation formula are as follows: target_speed_rate_ after theoretical air-fuel ratio weights
1 (i)=(q (i)-β) * target_speed_rate (i), wherein target_speed_rate_1 (i) is after air-fuel ratio weights
The rotating speed of target rate of acceleration of different moments, q (i) are that the air-fuel ratio of different moments weights weight, target_speed_rate (i)
For the rotating speed of target rate of acceleration of initial different moments, β is that weight adjusts item；
(6) rotating speed of target of different moments, calculation formula after theoretical air-fuel ratio weights are as follows:
Target_speed_1 (i)=target_speed_rate_1 (i) * (t (i)-t (i-1))+target_speed_1 (i-
1),
Wherein target_speed_1 (i) is the rotating speed of target of different moments after air-fuel ratio weighting, target_speed_rate_1
It (i) is the rotating speed of target rate of acceleration of different moments after air-fuel ratio weighting, target_speed_1 (i-1) is the (i-1)-th moment internal combustion
Rotating speed of target after the weighting of machine air-fuel ratio；
(7) amendment of the rotating speed of target after air-fuel ratio weighting, it is ensured that the final rotating speed of target in air-fuel ratio weighting front and back is identical, repairs
Positive formula are as follows:
Target_speed_2 (i)=(target_speed_1 (i)-min (target_speed_1 (i)))/(max
(target_speed_1 (i))-min (target_speed_1 (i))) * (b-a)+a,
Wherein target_speed_1 (i) is the rotating speed of target of the different moments obtained after air-fuel ratio weights, min (target_
Speed_1 (i)) be the rotating speed of target of different moments obtained after air-fuel ratio weighting minimum value, max (target_speed_1
It (i)) is the maximum value of the rotating speed of target of the different moments obtained after air-fuel ratio weighting, b is the maximum value of initial target revolving speed, a
For the minimum value of initial target revolving speed；
(8) on the basis of the rotating speed of target obtained after the weighting of this air-fuel ratio, internal combustion is judged by experiment or simulation calculation
Whether machine performance indexes parameter reaches preset requirement, if reaching preset requirement, optimization terminates；If not up to default
Requirement turn then using the excess air ratio that currently obtains and rotating speed of target as initial excess air ratio and initial target revolving speed
Enter step (4).
2. the internal combustion engine according to claim 1 based on air-fuel ratio weighting suddenly accelerates and anxious loading scheme optimization method,
It is characterized in:
Internal combustion engine is in suddenly load:
(1) the initial loading scheme of internal combustion engine is given；
(2) the targeted loads increment rate of initial different moments, calculation formula are calculated are as follows: target_load_rate (i)=
(target_load (i)-target_load (i-1))/(t (i)-t (i-1)), wherein target_load_rate (i) is initial
The targeted loads increment rate of different moments, target_load (i), target_load (i-1) are the i-th moment and the (i-1)-th moment
Initial target load, t (i), t (i-1) were respectively the i-th and (i-1)-th moment；
(3) excess air ratio of initial acceleration scheme lower different moments is obtained by experiment or simulation calculation
(4) the weight q (i) of theoretical air-fuel ratio weighting: whenWhen, enable weight q (i)=α；When
When, enable weight When, enabling weight q (i) is 1, wherein algebraic variable of the α between 2-3；
(5) the targeted loads increment rate of different moments, calculation formula are as follows: target_load_rate_1 after theoretical air-fuel ratio weights
(i)=(q (i)-β) * target_load_rate (i), wherein target_load_rate_1 (i) is difference after air-fuel ratio weighting
The targeted loads increment rate at moment, q (i) are that the air-fuel ratio of different moments weights weight, and target_load_rate (i) is initial
The targeted loads increment rate of different moments, β are that weight adjusts item；
(6) targeted loads of different moments, calculation formula after theoretical air-fuel ratio weights are as follows: target_load-1 (i)=
Target_load_rate-1 (i) * (t (i)-t (i-1))+target_load_1 (i-1), wherein target_load_1 (i) is
The targeted loads of different moments after air-fuel ratio weighting, target_load_rate_1 (i) are different moments after air-fuel ratio weighting
Targeted loads increment rate, target_load_1 (i-1) are the targeted loads after the weighting of the (i-1)-th moment air-fuel ratio；
(7) amendment of the targeted loads after air-fuel ratio weighting, it is ensured that the final targeted loads in air-fuel ratio weighting front and back are identical, amendment
Formula are as follows:
Target_load_2 (i)=(target_load_1 (i)-min (target_load_1 (i)))/(max (target_
Load_1 (i))-min (target_load_1 (i))) * (b-a)+a,
Wherein target_load_1 (i) is the targeted loads of the different moments obtained after air-fuel ratio weighted optimization, min
The minimum value of (target_load_1 (i)) for the targeted loads of the different moments obtained after air-fuel ratio weighted optimization, max
It (target_load_1) is the maximum value of the targeted loads of the different moments obtained after air-fuel ratio weighted optimization, b is initial target
The maximum value of load, a are the minimum value of initial target load；
(8) on the basis of the targeted loads obtained after the weighting of this air-fuel ratio, internal combustion is judged by experiment or simulation calculation
Whether machine performance indexes parameter reaches preset requirement, if reaching preset requirement, optimization terminates；If not up to preset
It is required that the excess air ratio and rotating speed of target currently to obtain are transferred to step as initial excess air ratio and initial target revolving speed
Suddenly (4).
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| CN102536485A (en) * | 2010-12-24 | 2012-07-04 | 川崎重工业株式会社 | Air-fuel ratio control system and air-fuel ratio control method of internal combustion engine |
| JP2013241905A (en) * | 2012-05-22 | 2013-12-05 | Suzuki Motor Corp | Air-fuel ratio control device for internal combustion engine |
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| CN102536485A (en) * | 2010-12-24 | 2012-07-04 | 川崎重工业株式会社 | Air-fuel ratio control system and air-fuel ratio control method of internal combustion engine |
| JP2013241905A (en) * | 2012-05-22 | 2013-12-05 | Suzuki Motor Corp | Air-fuel ratio control device for internal combustion engine |
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| 《电喷发动机过渡工况空燃比鲁棒控制研究》;石向南等;《湖南大学学报》;20100930;第37卷(第9期);全文 |
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