CN1973124A - Dispersion detecting device of amount of suction air - Google Patents
Dispersion detecting device of amount of suction air Download PDFInfo
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- CN1973124A CN1973124A CN 200580020420 CN200580020420A CN1973124A CN 1973124 A CN1973124 A CN 1973124A CN 200580020420 CN200580020420 CN 200580020420 CN 200580020420 A CN200580020420 A CN 200580020420A CN 1973124 A CN1973124 A CN 1973124A
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- 239000006185 dispersion Substances 0.000 title claims description 25
- 239000000446 fuel Substances 0.000 claims abstract description 297
- 238000002347 injection Methods 0.000 claims abstract description 140
- 239000007924 injection Substances 0.000 claims abstract description 140
- 238000002485 combustion reaction Methods 0.000 claims abstract description 68
- 230000008859 change Effects 0.000 claims description 117
- 230000007246 mechanism Effects 0.000 claims description 116
- 238000001514 detection method Methods 0.000 claims description 19
- 239000000284 extract Substances 0.000 claims description 9
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- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000012545 processing Methods 0.000 description 25
- 230000005540 biological transmission Effects 0.000 description 19
- 238000012544 monitoring process Methods 0.000 description 15
- 239000007789 gas Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 14
- 230000035945 sensitivity Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 238000001914 filtration Methods 0.000 description 6
- 238000010304 firing Methods 0.000 description 6
- 230000010355 oscillation Effects 0.000 description 6
- 230000037361 pathway Effects 0.000 description 6
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- 238000012423 maintenance Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 230000001052 transient effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 231100000331 toxic Toxicity 0.000 description 3
- 230000002588 toxic effect Effects 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- 206010021143 Hypoxia Diseases 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000007954 hypoxia Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000004941 influx Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
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- 238000005086 pumping Methods 0.000 description 1
- 230000003238 somatosensory effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Abstract
An intake air quantity variation detecting device capable of accurately detecting a variation in intake air quantity between cylinders in an internal combustion engine having the plurality of cylinders. A fuel injection quantity is changed from an injection quantity in a stoichiometric operation to an injection quantity increasing side or an injection quantity decreasing side. The width of a variation in torque or rotational speed at that time is obtained, and the width of the variation in the torque or the rotational speed is outputted as an index value indicating the degree of the variation in the intake air quantity between the cylinders.
Description
Technical field
The present invention relates in having the internal-combustion engine of a plurality of cylinders, detect the detection device of the deviation of the suction air quantity between cylinder, in detail, the present invention relates to be used in detection device in the internal-combustion engine of variable stigmatic opening transmission device, suitable with the working angle that can change intake valve or lift.
Background technique
In the past, the internal-combustion engine with variable stigmatic opening transmission device of the working angle that can control intake valve changeably or lift was known.In this internal-combustion engine,, suck air quantity by this working angle and lift control so closure can not used owing to control the working angle and the lift of intake valve changeably.In this case, owing in suction tude, do not produce negative pressure, so can reduce the pumping loss of internal-combustion engine.
But, owing in having the internal-combustion engine of variable stigmatic opening transmission device, suck air quantity by working angle and lift decision, so when having the deviation of working angle and lift between cylinder, this can become the reason that sucks air quantity generation deviation between cylinder.The influence that the deviation that sucks air quantity is caused for the deviation of working angle and lift, particularly, when sucking the few little working angle of air quantity, little lift, become significantly, when the deviation that sucks air quantity becomes excessive, the internal-combustion torque change can be caused, the deterioration of toxic emission can be caused.Therefore, in having the internal-combustion engine of variable stigmatic opening transmission device, require to detect the deviation of the suction air quantity between cylinder, and carry out the working angle of each cylinder and lift adjustment in case with Deviation Control to permissible range.
As the method for the deviation that detects the suction air quantity between cylinder, the combustion regime that detects each cylinder is for example arranged, the method that detects according to its deviation.Method about the deviation of the combustion regime that detects each cylinder has been disclosed in patent documentation 1 grade.And, also have following method, that is, detect the variable quantity of the intake pipe negative pressure of each cylinder, the air fuel ratio of each cylinder or the firing pressure of each cylinder, according to the deviation of the suction air quantity between their deviation detection cylinder.
Patent documentation 1: No. 2831483 communiques of Japan's special permission
Patent documentation 2: Japanese kokai publication hei 4-299084 communique
Patent documentation 3: TOHKEMY 2004-176689 communique
Patent documentation 4: Japanese kokai publication hei 5-156979 communique
Summary of the invention
But in the various detecting methods of enumerating in front, the instrumentation error during detection is big, so be difficult to correctly detect the deviation of the suction air quantity between cylinder.If can not correctly hold the deviation state of the suction air quantity between cylinder, just can not correctly adjust the working angle and the lift of intake valve to each cylinder.
The present invention proposes in order to address the above problem, and its purpose is to provide a kind of dispersion detecting device of amount of suction air that can correctly detect the deviation of the suction air quantity between cylinder.
To achieve these goals, the 1st invention is a kind of device that detects the deviation of the suction air quantity between cylinder in having the internal-combustion engine of a plurality of cylinders, it is characterized in that, be used for detecting the deviation of the suction air quantity between cylinder at internal-combustion engine with a plurality of cylinders, it is characterized in that, have: the emitted dose control mechanism makes the emitted dose of fuel injection amount when chemically correct fuel turns round change to increasing side or reducing the side either side; Calculation mechanism is obtained moment of torsion or change in rotational speed amplitude when by described emitted dose control mechanism fuel injection amount being changed; And output mechanism, moment of torsion or change in rotational speed amplitude that described calculation mechanism is obtained are exported as the desired value of the extent of deviation of the suction air quantity between the expression cylinder.
On the basis of the 1st invention, the 2nd invention is characterised in that, have: mechanism relatively compares emitted dose described amplitude of variation and the specified reference value when increasing side variation of fuel injection amount when chemically correct fuel turn round described emitted dose control mechanism; And decision mechanism, when described amplitude of variation surpassed described reference value, the deviation that is judged as the suction air quantity between cylinder surpassed permissible level.
On the basis of the 1st invention, the 3rd invention is characterised in that, have: mechanism relatively compares emitted dose described amplitude of variation and the specified reference value when reducing side variation of fuel injection amount when chemically correct fuel turn round described emitted dose control mechanism; And decision mechanism, when described amplitude of variation was lower than described reference value, the deviation that is judged as the suction air quantity between cylinder surpassed permissible level.
In the 1st to the 3rd invention on the basis of arbitrary invention, the 4th invention is characterised in that: described emitted dose control mechanism constitutes, make the emitted dose of fuel injection amount when chemically correct fuel turns round increase side or established amount reduces the side cyclically-varying to established amount, described calculation mechanism constitutes, from moment of torsion or rotation speed change, extract the variance components with the variation frequency same frequency of fuel injection amount out, the amplitude of the variance components extracted out is obtained as described amplitude of variation.
To achieve these goals, the 5th invention is a kind of device that detects the deviation of the suction air quantity between cylinder in having the internal-combustion engine of a plurality of cylinders, it is characterized in that, have: emitted dose control mechanism, the fuel injection amount that makes the specific cylinder in the described a plurality of cylinder emitted dose when chemically correct fuel turns round changes to increasing side or reducing the side either side; Calculation mechanism is obtained moment of torsion or change in rotational speed amplitude when by described emitted dose control mechanism the fuel injection amount of described specific cylinder being changed; And output mechanism, moment of torsion or change in rotational speed amplitude that described calculation mechanism is obtained are exported as the desired value of the degrees of offset of the suction air quantity of the described specific cylinder of expression.
On the basis of the 5th invention, the 6th invention is characterised in that, have: mechanism relatively, emitted dose described amplitude of variation and the specified reference value when increasing side variation of the fuel injection amount that described emitted dose control mechanism is made described specific cylinder when chemically correct fuel turn round compares; And decision mechanism, when described amplitude of variation surpassed described reference value, the suction air quantity that is judged as in the described specific cylinder surpassed permissible level to the skew of superfluous side.
On the basis of the 5th invention, the 7th invention is characterised in that, have: mechanism relatively, emitted dose described amplitude of variation and the specified reference value when reducing side variation of the fuel injection amount that described emitted dose control mechanism is made described specific cylinder when chemically correct fuel turn round compares; And decision mechanism, when described amplitude of variation was lower than described reference value, the suction air quantity that is judged as in the described specific cylinder surpassed permissible level to the skew of not enough side.
In the 5th to the 7th invention on the basis of arbitrary invention, the 8th invention is characterised in that: described emitted dose control mechanism constitutes, the emitted dose of the fuel injection amount that makes described specific cylinder when chemically correct fuel turns round increases side or established amount reduces the side cyclically-varying to established amount, described calculation mechanism constitutes, from moment of torsion or rotation speed change, extract the variance components with the variation frequency same frequency of the fuel injection amount of described specific cylinder out, the amplitude of the variance components extracted out is obtained as described amplitude of variation.
To achieve these goals, the 9th invention is a kind of device that detects the deviation of the suction air quantity between cylinder in having the internal-combustion engine of a plurality of cylinders, it is characterized in that, have: the emitted dose control mechanism makes the emitted dose of fuel injection amount when chemically correct fuel turns round change to increasing side or reducing the side either side; Calculation mechanism is obtained moment of torsion or change in rotational speed amplitude when by described emitted dose control mechanism fuel injection amount being changed to each cylinder; And output mechanism, the moment of torsion of each cylinder that described calculation mechanism is obtained or change in rotational speed amplitude are as the desired value output of the degrees of offset that sucks air quantity in each cylinder of expression.
On the basis of the 9th invention, the 10th invention is characterised in that, have: mechanism relatively, each cylinder relatively compares emitted dose described amplitude of variation and the specified reference value when increasing side variation of fuel injection amount when chemically correct fuel turn round described emitted dose control mechanism; And decision mechanism, when described amplitude of variation surpassed described reference value, the suction air quantity that is judged as in this cylinder surpassed permissible level to the skew of superfluous side.
On the basis of the 9th invention, the 11st invention is characterised in that, have: mechanism relatively, each cylinder relatively compares emitted dose described amplitude of variation and the specified reference value when reducing side variation of fuel injection amount when chemically correct fuel turn round described emitted dose control mechanism; And decision mechanism, when described amplitude of variation was lower than described reference value, the suction air quantity that is judged as in this cylinder surpassed permissible level to the skew of not enough side.
In the 9th to the 11st invention on the basis of arbitrary invention, the 12nd invention is characterised in that: described emitted dose control mechanism constitutes, make the emitted dose of fuel injection amount when chemically correct fuel turns round increase side or established amount reduces the side cyclically-varying to established amount, described calculation mechanism constitutes, from to extracting the variance components with the variation frequency same frequency of fuel injection amount the moment of torsion of each cylinder sampling or the change in rotational speed out, the amplitude of the variance components extracted out is obtained as the described amplitude of variation in each cylinder.
To achieve these goals, the 13rd invention is a kind of device that detects the deviation of the suction air quantity between cylinder in having the internal-combustion engine of a plurality of cylinders, it is characterized in that, have: the first emitted dose control mechanism, the fuel injection amount that makes the specific cylinder in the described a plurality of cylinder emitted dose when chemically correct fuel turns round changes to increasing side; First calculation mechanism is obtained moment of torsion or change in rotational speed amplitude when by the described first emitted dose control mechanism fuel injection amount of described specific cylinder being changed; The second emitted dose control mechanism surpasses under the situation of specified reference value at moment of torsion that described first calculation mechanism is obtained or change in rotational speed amplitude, and the emitted dose of the fuel injection amount that makes described specific cylinder when chemically correct fuel turn round is to reducing the side variation; Second calculation mechanism is obtained moment of torsion or change in rotational speed amplitude when by the described second emitted dose control mechanism fuel injection amount of described specific cylinder being changed; And output mechanism, moment of torsion that described first calculation mechanism is obtained or change in rotational speed amplitude, and the moment of torsion obtained of described second calculation mechanism or change in rotational speed amplitude as the desired value output of the degrees of offset of the suction air quantity of the described specific cylinder of expression.
On the basis of arbitrary invention, the 14th invention is characterised in that: described emitted dose control mechanism makes the fuel injection amount cyclically-varying with the frequency outside the appreciable frequency band of the person in the the 4th, the 8th, the 12nd invention.
On the basis of arbitrary invention, the 15th invention is characterised in that in the 1st to the 14th invention: have change-over mechanism, its deviation with the suction air quantity between cylinder is scaled the working angle of the intake valve between cylinder and/or the deviation of lift.
Have the situation of deviation for the suction air quantity between cylinder, when the emitted dose that makes fuel injection amount when chemically correct fuel turns round to increasing side or reduce the side either side when changing, corresponding with the extent of deviation that sucks air quantity, on moment of torsion or rotating speed, occur changing.According to the 1st invention, because moment of torsion when fuel injection amount changed or change in rotational speed amplitude are as the desired value output of the extent of deviation of the suction air quantity between the expression cylinder, so can correctly detect the deviation of the suction air quantity between cylinder.
Particularly, according to the 2nd invention, owing to make the emitted dose of fuel injection amount when chemically correct fuel turn round to increasing the side variation, so with suck air quantity suitably or not produce the change of moment of torsion in the cylinder that not enough lateral deviation is moved relative, sucking air quantity produces moment of torsion accordingly with the degree of skew in the cylinder that superfluous lateral deviation is moved change.Therefore, by moment of torsion or the change in rotational speed amplitude of the emitted dose of fuel injection amount when chemically correct fuel turns round when increasing side and change compared with specified reference value, whether the deviation of the suction air quantity between cylinder that can judge rightly is above permissible level.
And, according to the 3rd invention, owing to make the emitted dose of fuel injection amount when chemically correct fuel turn round to reducing the side variation, so with suck air quantity suitably or to produce certain moment of torsion change in the cylinder that superfluous lateral deviation is moved relative, sucking air quantity in the cylinder that not enough lateral deviation is moved, with the skew degree accordingly, the change of moment of torsion reduces.Therefore, by moment of torsion or the change in rotational speed amplitude of the emitted dose of fuel injection amount when chemically correct fuel turns round when reducing side and change compared with specified reference value, whether the deviation of the suction air quantity between cylinder that can judge rightly is above permissible level.
In addition, according to the 4th invention, because the emitted dose of fuel injection amount when chemically correct fuel turns round changed periodically, and from moment of torsion or change in rotational speed, extract variance components with this variation frequency same frequency out, so, can both correctly hold the extent of deviation that sucks air quantity no matter the operating condition of internal-combustion engine is normal state or transient state.
According to the 5th invention, moment of torsion when changing owing to the fuel injection amount with specific cylinder or change in rotational speed amplitude are as the desired value output of the degrees of offset of the suction air quantity of this specific cylinder of expression, so can correctly detect the skew of the suction air quantity in this specific cylinder.And, by all cylinders being detected the skew that sucks air quantity respectively, can correctly detect the deviation of the suction air quantity between cylinder.And, according to the present invention,,, suppress the change of moment of torsion or air fuel ratio so can reduce the variation of whole fuel injection amount because the fuel injection amount of the specific cylinder in a plurality of cylinders is changed.
Especially, according to the 6th invention, because the emitted dose of the fuel injection amount that makes specific cylinder when chemically correct fuel turn round is to increasing the side variation, so with the suction air quantity of this specific cylinder suitably or not produce the change of moment of torsion under the situation that not enough lateral deviation is moved relative, sucking air quantity produces moment of torsion accordingly with the degree of skew under the situation that superfluous lateral deviation is moved change.Therefore, by moment of torsion or the change in rotational speed amplitude of the emitted dose of the fuel injection amount in the specific cylinder when chemically correct fuel turns round when increasing side and change compared with specified reference value, the suction air quantity in this specific cylinder that can judge rightly out to the skew of superfluous side whether above permissible level.
And, according to the 7th invention, because the emitted dose of the fuel injection amount that makes specific cylinder when chemically correct fuel turn round is to reducing the side variation, so with the suction air quantity of this specific cylinder suitably or to produce certain moment of torsion change under the situation that superfluous lateral deviation is moved relative, sucking air quantity under the situation that not enough lateral deviation is moved, with the skew degree accordingly, the change of moment of torsion reduces.Therefore, by moment of torsion or the change in rotational speed amplitude of the emitted dose of the fuel injection amount in the specific cylinder when chemically correct fuel turns round when reducing side and change compared with specified reference value, the suction air quantity in this specific cylinder that can judge rightly out to the skew of not enough side whether above permissible level.
In addition, according to the 8th invention, because the emitted dose of the fuel injection amount that makes specific cylinder when chemically correct fuel turns round changes periodically, and from moment of torsion or change in rotational speed, extract variance components with this variation frequency same frequency out, so, can both correctly hold the skew of the suction air quantity in this specific cylinder no matter the operating condition of internal-combustion engine is normal state or transient state.
According to the 9th invention, because moment of torsion or change in rotational speed amplitude when each cylinder is obtained the fuel injection amount variation, and with its desired value output, so can correctly detect the skew of the suction air quantity in each cylinder as the degrees of offset of the suction air quantity in each cylinder of expression.And, by detecting the skew of the suction air quantity in each cylinder, can correctly detect the deviation of the suction air quantity between cylinder.And, according to the present invention, compare with the situation that relative each cylinder changes fuel injection amount, can detect the skew of the suction air quantity in each cylinder at short notice.
Particularly, according to the 10th invention, owing to make the emitted dose of fuel injection amount when chemically correct fuel turn round to increasing the side variation, so with suck air quantity suitably or not produce the change of moment of torsion in the cylinder that not enough lateral deviation is moved relative, sucking air quantity produces moment of torsion accordingly with the degree of skew in the cylinder that superfluous lateral deviation is moved change.Therefore, by each cylinder being obtained moment of torsion or the change in rotational speed amplitude of the emitted dose of fuel injection amount when chemically correct fuel turns round when increasing side and change, and itself and specified reference value compared, suck air quantity in each cylinder that can judge rightly out and whether surpass permissible level to the skew of superfluous side.
And, according to the 11st invention, owing to make the emitted dose of fuel injection amount when chemically correct fuel turn round to reducing the side variation, so with suck air quantity suitably or to produce certain moment of torsion change in the cylinder that superfluous lateral deviation is moved relative, sucking air quantity in the cylinder that not enough lateral deviation is moved, with the skew degree accordingly, the change of moment of torsion reduces.Therefore, by each cylinder being obtained moment of torsion or the change in rotational speed amplitude of the emitted dose of fuel injection amount when chemically correct fuel turns round when reducing side and change, and itself and specified reference value compared, suck air quantity in each cylinder that can judge rightly out and whether surpass permissible level to the skew of not enough side.
In addition, according to the 12nd invention, because the emitted dose of fuel injection amount when chemically correct fuel turns round changed periodically, and to extracting the variance components with this variation frequency same frequency the moment of torsion of each cylinder sampling or the change in rotational speed out, so, can both correctly hold the skew of the suction air quantity in each cylinder no matter the operating condition of internal-combustion engine is normal state or transient state.
According to the 13rd invention, owing to the emitted dose of fuel injection amount when chemically correct fuel turn round in the specific cylinder changed to increasing side, and at that time moment of torsion or change in rotational speed amplitude exported as the desired value of the degrees of offset of the suction air quantity in this specific cylinder of expression.And, surpass under the situation of reference value in above-mentioned amplitude of variation, the emitted dose of fuel injection amount when chemically correct fuel turns round in the specific cylinder changed to reducing side, and moment of torsion that will be at that time or change in rotational speed amplitude are as the desired value output of the degrees of offset of the suction air quantity in this specific cylinder of expression.Like this, the phenomenon of catching fire that the suction air quantity in this specific cylinder causes can be prevented under the situation that superfluous lateral deviation is moved, and the skew of the suction air quantity in this specific cylinder can be correctly detected.
And, according to the 14th invention, even in moment of torsion, produce change because fuel injection amount is changed periodically, but also because this frequency is positioned at outside the frequency band that people's somatosensory arrives, so can not bring uncomfortable feeling or sticky feeling to the occupant.
According to the 15th invention,, can easily revise the operation that the deviation of suction air quantity is used because the deviation of the suction air quantity between cylinder is scaled the working angle of the intake valve between cylinder and/or the deviation of lift.
Description of drawings
Fig. 1 is used to illustrate the structure that is suitable for as the internal-combustion engine of the dispersion detecting device of amount of suction air of the embodiment of the invention 1.
Fig. 2 represents the generation moment of torsion of internal-combustion engine and the relation of the interior air fuel ratio of cylinder.
Fig. 3 represent to make the emitted dose of fuel injection amount when chemically correct fuel turns round when increasing side and change periodically, suck air fuel ratio, moment of torsion, change in rotational speed in the cylinder of air quantity to the cylinder that superfluous lateral deviation is moved.
Fig. 4 represent to make the emitted dose of fuel injection amount when chemically correct fuel turns round when increasing side and change periodically, suck air fuel ratio, moment of torsion, change in rotational speed in the cylinder of air quantity to the cylinder that not enough lateral deviation is moved.
Fig. 5 is the flow chart of the working angle deviation trace routine of execution in embodiments of the invention 1.
Fig. 6 is used for illustrating the effect of the filtration treatment of carrying out in the program of Fig. 5.
Fig. 7 is the flow chart of the working angle deviation trace routine of execution in embodiments of the invention 2.
Fig. 8 is the flow chart of the working angle deviation trace routine of execution in embodiments of the invention 3.
Fig. 9 represent to make the emitted dose of fuel injection amount when chemically correct fuel turns round when reducing side and change periodically, suck air fuel ratio, moment of torsion, change in rotational speed in the cylinder of air quantity to the cylinder that not enough lateral deviation is moved.
Figure 10 represent to make the emitted dose of fuel injection amount when chemically correct fuel turns round when reducing side and change periodically, suck air fuel ratio, moment of torsion, change in rotational speed in the cylinder of air quantity to the cylinder that superfluous lateral deviation is moved.
Figure 11 is the flow chart of the working angle deviation trace routine of execution in embodiments of the invention 5.
Label declaration
2-internal-combustion engine
4-inlet air pathway
6-exhaust passageway
10-firing chamber
12-intake valve
14-exhaust valve
16-variable stigmatic opening transmission device
18-sparger
22-actuator
24-Control Shaft
28-bent axle
30—ECU
32-Air flow meter
4-crankshaft angle sensor
#1-the 1st cylinder
#2-the 2nd cylinder
#3-the 3rd cylinder
#4-the 4th cylinder
Embodiment
Mode of execution 1
Below, referring to figs. 1 through Fig. 6 embodiments of the present invention 1 are described.
Fig. 1 is used to illustrate the structure that is suitable for as the internal-combustion engine of the dispersion detecting device of amount of suction air of embodiment of the present invention.The internal-combustion engine 2 of present embodiment constitutes the in-line four cylinder internal-combustion engine with four cylinder #1～#4.
Internal-combustion engine 2 has inlet air pathway 4 that imports air and the exhaust passageway 6 of discharging combustion gas.Upstream extremity at inlet air pathway 4 is provided with air-strainer 20, is provided with in the very near downstream part of distance air-strainer 20 to measure the Air flow meter 32 that sucks air quantity (influx of the air of time per unit).The upstream-side-end of the end of downstream side of inlet air pathway 4 and exhaust passageway 6 is connected respectively to the firing chamber 10 of each cylinder #1～#4.At the downstream portion of inlet air pathway 4, sparger 18 is installed on each cylinder #1～#4.
In the firing chamber 10 and the joint of inlet air pathway 4 intake valve 12 of its connected state of control is set.In the firing chamber 10 and the joint of exhaust passageway 6 exhaust valve 14 of its connected state of control is set.Intake valve 12 and exhaust valve 14 all receive from the input of the driving force of not shown camshaft and carry out on-off action.Particularly, for each cylinder #1～#4, the variable stigmatic opening transmission device 16 that can carry out variable control to the working angle and the lift of intake valve 12 is set on intake valve 12.Each variable stigmatic opening transmission device 16 is connected by public Control Shaft 24, by by actuator (for example motor) 22 rotation drive controlling axles 24, can drive whole variable stigmatic opening transmission devices 16 integratedly.In this internal-combustion engine 2, the operation of unshowned accelerator pedal is operated actuator 22 in the corresponding diagram, drives variable stigmatic opening transmission device 16, controls the working angle and the lift of intake valve 12 changeably, can not use closure thus and controls the suction air quantity.
In addition, although unqualified to the structure of variable stigmatic opening transmission device 16,, for example can followingly constitute.Between camshaft and intake valve 12, be provided with the swing arm of synchronously swinging with the action of cam.Swing arm is installed on the internal-combustion engine 2 with having degrees of freedom, so that can follow the rotation of Control Shaft 24 that the basic relative angle of relative intake valve 12 is changed.In this structure, when Control Shaft 24 rotated, the benchmark relative angle of swing arm and intake valve 12 changed.And when this relative angle changed, the pushing force of cam began to be delivered to after the swing arm, promptly, make after swing arm begins swing in action of cam, to swing arm in fact begin to depress intake valve 12 during change.Therefore, according to said structure,, can change the working angle of intake valve 12 and the size of lift by controlling by the rotational position of 22 pairs of Control Shafts 24 of actuator.
And internal-combustion engine 2 has the ECU (electronic control unit) 30 as its control gear.Outlet side at ECU30 connects various machines such as above-mentioned sparger 18, variable stigmatic opening transmission device 16.Except that above-mentioned Air flow meter 32, also connect various sensors such as above-mentioned crankshaft angle sensor 34 at the input side of ECU30.Crankshaft angle sensor 34 is whenever the rotate to an angle sensor of output signal of bent axle 28.ECU30 drives each machine based on the output of each sensor, according to the rules control program, also plays a role as dispersion detecting device of amount of suction air of the present invention.
Then, use Fig. 2 to Fig. 4 that the basic skills that the deviation of suction air quantity detects is described.At first, Fig. 2 represents the generation moment of torsion of internal-combustion engine and the relation of the interior air fuel ratio (A/F) of cylinder.As shown in the drawing, compare with chemically correct fuel under the situation that is positioned at dense combustion side in air fuel ratio, almost there is not the variation of the moment of torsion of relative air fuel ratio.That is, the sensitivity of the relative air fuel ratio of moment of torsion is little.This is owing to the fuel that surpasses the chemically correct fuel part can not burn because of hypoxia, hardly can be to moment of torsion generation effect.On the other hand, compare with chemically correct fuel under the situation that is positioned at the lean-burn side in air fuel ratio, big variation takes place in the corresponding air fuel ratio of moment of torsion, and air fuel ratio is the closer to the lean-burn side, and moment of torsion is more little.That is, the sensitivity of the relative air fuel ratio of moment of torsion is big.This is because the fuel of supplying with all burns, and determines moment of torsion by the burnt fuel amount.In the present invention, utilize the poor sensitivity of the relative air fuel ratio of this moment of torsion, detect the deviation of the suction air quantity between cylinder.
Fig. 3 and Fig. 4 are illustrated under the idling mode, make air fuel ratio, moment of torsion, change in rotational speed in the cylinder of the emitted dose of fuel injection amount when chemically correct fuel turns round when increasing side and change periodically.When internal-combustion engine 2 turned round in theoretical air fuel ratio, the air fuel ratio of whole internal-combustion engine was a chemically correct fuel.But, between cylinder, the working angle of intake valve 12 and lift exist under the situation of deviation, exist to suck the cylinder and suction air quantity cylinder than standard volume deficiency of air quantity than standard volume surplus, in the former cylinder, air fuel ratio is compared with chemically correct fuel and is positioned at the lean-burn side; In the latter's cylinder, air fuel ratio is compared with chemically correct fuel and is positioned at dense combustion side.
Sucking air quantity in the cylinder (being called the lean-burn cylinder) that superfluous lateral deviation is moved, when fuel injection amount was changed, air fuel ratio, moment of torsion, rotating speed changed respectively as illustrated in fig. 3 in the cylinder.At first, air fuel ratio changes to lean-burn side and dense combustion side periodically through chemically correct fuel in the cylinder.When air fuel ratio in the cylinder was positioned at the lean-burn side, the sensitivity of the relative air fuel ratio of moment of torsion was big, and is relative therewith, and when air fuel ratio in the cylinder was positioned at dense combustion side, the sensitivity of the relative air fuel ratio of moment of torsion was little.Therefore, in the lean-burn cylinder, when air fuel ratio in the cylinder was positioned at dense combustion side, moment of torsion was roughly certain; When air fuel ratio in the cylinder was positioned at the lean-burn side, the degree of moment of torsion and lean-burn reduced accordingly.As a result, the moment of torsion of lean-burn cylinder changed with the cycle identical with the variation of air fuel ratio in the cylinder.And under idling mode, rotating speed and moment of torsion change accordingly, so rotating speed presents the variation same with moment of torsion.In the cylinder in chemically correct fuel when running air fuel ratio from chemically correct fuel to the lean-burn lateral deviation move many more, the vibration amplitude Δ T of the moment of torsion shown in Fig. 3, the vibration amplitude Δ Ne of rotating speed are big more.
Relative therewith, sucking air quantity in the cylinder (being called dense gas cylinder) that not enough lateral deviation is moved, when fuel injection amount was changed, air fuel ratio, moment of torsion, rotating speed changed respectively as illustrated in fig. 4 in the cylinder.At first, air fuel ratio is changing than ground regional cycle of chemically correct fuel by dense combustion side in the cylinder.But when air fuel ratio in the cylinder was positioned at dense combustion side, the sensitivity of the relative air fuel ratio of moment of torsion was little, so in dense gas cylinder, no matter the variation of air fuel ratio in the cylinder, moment of torsion is certain substantially.And the same with moment of torsion under idling mode, rotating speed is certain substantially.
In view of above reason, change periodically to increasing side by making the emitted dose of fuel injection amount when chemically correct fuel turns round, and monitoring moment of torsion or change in rotational speed at that time, can detect the existence that sucks the cylinder that air quantity moves to superfluous lateral deviation.That is, sucking air quantity under the situation that the cylinder that superfluous lateral deviation is moved exists, moment of torsion, rotating speed produce the variation in cycle.And, suck the cylinder that air quantity is moved to superfluous lateral deviation if exist, then also certainly exist on the contrary and suck the cylinder that air quantity is moved to not enough lateral deviation.Therefore, the cycle change list of moment of torsion or rotating speed is shown in and has the deviation that sucks air quantity between cylinder.
And the degree that the suction air quantity in the lean-burn cylinder is moved to superfluous lateral deviation is big more, and the Oscillation Amplitude of moment of torsion, rotating speed is big more.If the degree that the suction air quantity in the lean-burn cylinder is moved to superfluous lateral deviation is big, we can say also on the contrary that then the suction air quantity in the dense gas cylinder is big to the degrees of offset of not enough side.That is, we can say that the deviation of the suction air quantity between cylinder is big.Therefore,, measure its Oscillation Amplitude, can correctly hold the extent of deviation of the suction air quantity between cylinder by detecting moment of torsion or change in rotational speed.
Below, the processing that ECU30 is carried out describes.The program that the program representation of Fig. 5 is carried out by ECU30.In this program, detect the working angle of intake valve 12 and the deviation of lift based on above-mentioned basic skills, and judge necessity of the correction that has or not working angle and lift according to this result.
In the initial step 100 of program shown in Figure 5, judge control mode, whether selected the detecting pattern of the deviation of detection effect angle and lift (the following working angle that only is called) as internal-combustion engine 2.For example in the travelling of vehicle, the certain distance of every walking selects detecting pattern termly automatically.And, in the time of also can be or one of the diagnostic mode during maintenance and select as the running in of internal-combustion engine 2.
Under the situation of having selected detecting pattern, operate the variable stigmatic opening transmission device 16 of each cylinder by the command signal of issuing actuator 22 from ECU30, the intake valve 12 of each cylinder is set at its working angle the little working angle of regulation.By working angle being set for little working angle, can make the lift of intake valve 12 and working angle become little lift linkedly.Like this intake valve 12 is set for little working angle and is because, working angle is more little, the deviation of working angle is big more to the influence that the deviation that sucks air quantity causes.That is, detect the deviation of working angle easily.Intake valve 12 is being set under the state of little working angle, carried out the idle running (more than, step 102) of internal-combustion engine 2.
In following step 104, make from the fuel injection amount of sparger 18 emitted dose when chemically correct fuel turns round to change periodically to increasing side.The change operation of this fuel injection amount is not only to carry out in certain specific cylinder, but all cylinders are all similarly carried out.And, avoid the variation frequency that frequency field that the people is easy to feel is set fuel injection amount.This be because, for the situation of execution detecting pattern in the travelling of vehicle, follow the moment of torsion of change of fuel injection amount or the change of rotating speed can not pass to the occupant as uncomfortable feeling.
After fuel injection amount is changed periodically, monitoring rotating speed (step 106) at that time.The rotating speed of internal-combustion engine 2 (rotation number of time per unit) can be by obtaining from the crank shaft angle signal of handling crankshaft angle sensor 34.Rotating speed after the monitoring is cushioned and is deposited with in the storage.
If the monitoring time of rotating speed reaches the stipulated time, FFT etc. just carry out filtration treatment to the rotary speed data after the buffer stock, the variance components (step 108) of the variation frequency same frequency of extraction and fuel injection amount.By this filtration treatment, for example, as shown in Figure 6, even the variation at subsidiary engines such as air-conditioning load causes under the situation of rotation speed change, by extracting out and the variance components of the variable cycle Δ t same period of fuel injection amount, also can under the situation that is not subjected to this outside influence of upsetting, correctly extract the change of the rotating speed of the change of following fuel injection amount out.
In following step 110, at first, according to its amplitude of fluctuation measurement of the detected rotating speed of step 108.As previously mentioned, the departure of the suction air quantity between the amplitude that makes the rotating speed of the emitted dose of fuel injection amount when chemically correct fuel turns round when increasing side and change periodically and cylinder is relevant, and the departure that sucks air quantity is big more, and the amplitude of rotating speed is big more.And the deviation of working angle is big more, and the deviation of the suction air quantity between cylinder is big more.That is, the departure of the working angle between cylinder is big more, and the amplitude of rotating speed is also big more.In step 110,, calculate the departure of the working angle that produces between cylinder by rotating speed amplitude and the contrast of pre-prepd correspondence table that will measure.
In following step 112, judge whether the departure of the working angle of calculating surpasses the admissible value of regulation in step 110.The admissible value consideration sucks the deviation of air quantity moment of torsion changes or toxic emission causes influence and instrumentation error is set.Under the situation of departure less than admissible value of working angle, can be judged as the deviation of the suction air quantity that problem do not occur now becoming.For this situation,,, finish this program so do not handle especially owing to do not proofread and correct necessity of working angle of the intake valve 12 of each cylinder.
On the other hand, as the result of determination of step 112, the departure of working angle is under the above situation of admissible value, can be judged as the deviation of the suction air quantity that existence can not be ignored between cylinder.For this situation, because necessity of the working angle of proofreading and correct intake valve 12 is arranged, so the signal (step 114) of ECU30 output is used for notifying operation person or maintenance person " there is deviation in working angle ".This signal the working angle of intake valve 12 suitably proofreaied and correct and cylinder between the deviation of suction air quantity be eliminated before output.
According to above program, can correctly detect the deviation of the suction air quantity between cylinder, and the working angle by suitably proofreading and correct intake valve 12 according to this testing result (and lift), can promptly eliminate the deviation of the suction air quantity between cylinder.In addition, can be by the working angle of proofreading and correct intake valve 12 at the assembling condition of each cylinder adjustment variable stigmatic opening transmission device 16.But, if make the variable stigmatic opening transmission device 16 of each cylinder have the function that to adjust the working angle of intake valve 12 automatically, then also can adjust automatically according to the departure (or amplitude of fluctuation of rotating speed) of the working angle of calculating in the step 110.
In addition, in the above-described embodiment, realize " the emitted dose control mechanism " of the 1st invention by the processing of the above-mentioned steps 104 of being undertaken by ECU30, processing by above-mentioned steps 106,108,110 realizes the 1st " calculation mechanism " of inventing, and realizes " output mechanism " of the 1st invention by the processing of above-mentioned steps 112,114.
Mode of execution 2
Below, with reference to Fig. 7 embodiments of the present invention 2 are described.
As the dispersion detecting device of amount of suction air of embodiment of the present invention 2, can by in mode of execution 1, make the program of ECU30 execution graph 7 replace the program of Fig. 5 to realize.
In mode of execution 1, though detect the deviation of the suction air quantity that produces between cylinder, the suction air quantity that does not detect which cylinder is many, the suction air quantity of which cylinder is few.Aspect the working angle and lift of the intake valve 12 of individually adjusting each cylinder, wish to hold the side-play amount that sucks air quantity relative datum value to each cylinder.The skew of the suction air quantity of each cylinder can be according to above-mentioned basic skills, by each cylinder control fuel injection amount is detected.That is, when increasing side and change periodically, moment of torsion or rotating speed produce under the situation of variation in cycle in the emitted dose of the fuel injection amount that makes a certain cylinder when chemically correct fuel turns round, and the suction air quantity that can be judged as this cylinder is moved to superfluous lateral deviation.And the amplitude of rotating speed etc. changes is big more, can be judged as that to suck air quantity big more to the skew of superfluous side.Therefore, moment of torsion or change in rotational speed when fuel injection amount being changed by each cylinder is monitored, and measure its vibration amplitude, can hold and suck the degree that air quantity is moved to superfluous lateral deviation in each cylinder.
The program of carrying out by ECU30 in the program representation present embodiment of Fig. 7.In this program, according to above-mentioned basic skills each air cylinder detecting is gone out the working angle and the lift of intake valve 12, and have or not the judgement of necessity of corrective function angle and lift based on its result.
In the initial step 200 of program shown in Figure 7, judge whether present control mode has selected the detecting pattern of the deviation of detection effect angle and lift (the following working angle that only is called).Under the situation of having selected detecting pattern, the processing of execution in step 202.In step 202, operate the variable stigmatic opening transmission device 16 of each cylinder according to the command signal of issuing actuator 22 from ECU30, the intake valve 12 of each cylinder is set its working angle for the little working angle of regulation.And, intake valve 12 being set under the state of little working angle, carry out the idle running of internal-combustion engine 2.
In following step 204, the emitted dose of the fuel injection amount that only makes certain specific cylinder when chemically correct fuel turns round changes periodically to increasing side.And the emitted dose the during running of so-called chemically correct fuel is meant, with the air fuel ratio of whole internal-combustion engine, fuel injection amount when promptly the average air-fuel ratio of all cylinders mode that becomes chemically correct fuel is adjusted the fuel injection amount of each cylinder, this specific cylinder.The variation frequency of fuel injection amount is at this moment avoided the frequency field setting that the people is easy to feel.Emitted dose when the fuel injection amount of the cylinder outside the specific cylinder remains the chemically correct fuel running.When the initial execution of this step, specific cylinder is set at the 1st cylinder #1.
After the fuel injection amount of the 1st cylinder #1 is changed periodically, monitoring at that time rotating speed and with its buffer stock (step 206) in storage.If the monitoring time of rotating speed reaches the stipulated time, FFT etc. just carry out filtration treatment to the rotary speed data of buffer stock, the variance components (step 208) of the variation frequency same frequency of extraction and fuel injection amount.
In following step 210, at first, according to its amplitude of fluctuation measurement of the detected rotating speed of step 208.The amplitude of the rotating speed of the emitted dose of the fuel injection amount that makes certain specific cylinder when chemically correct fuel turns round when increasing side and change periodically and the suction air quantity relative datum value of this cylinder (can realization theory air fuel ratio burn suction air quantity) be relevant to the side-play amount of superfluous side, it is big more to the side-play amount of superfluous side to suck air quantity, and the amplitude of rotating speed is big more.And the working angle relative datum value in this cylinder is big more to the side-play amount of big working angle side, and the suction air quantity is big more to the skew of superfluous side.That is, the working angle in this cylinder is big more to the side-play amount of big working angle side, and the amplitude of rotating speed is big more.In step 210,, calculate the side-play amount of the working angle that in this cylinder, produces by rotating speed amplitude and the contrast of pre-prepd correspondence table that will measure.
In step 212, judged whether to all air cylinder detecting the skew of working angle.When the cylinder of residual not detection, advance to step 216, the variation of the specific cylinder of the change operation of execution fuel injection amount is carried out.Specifically, be under the situation of cylinder of cylinder #n at present specific cylinder, make specific cylinder become the cylinder of ensuing cylinder #n+1.After the processing of step 216, carry out the processing of step 204 to 212 once more.In step 204, the emitted dose of the fuel injection amount that only makes the specific cylinder that step 216 sets when chemically correct fuel turn round changes periodically to the increase side.Before setting up, the condition of the detection end of all cylinders, step 212 repeats above circulation.
Under the situation that the condition of step 212 is set up, carry out the judgement of step 214.In step 214,, calculate the departure of the working angle between cylinder according to the side-play amount of carrying out the working angle of each cylinder of calculating by above-mentioned circuit.And, judge whether the departure of the working angle of calculating surpasses the admissible value of regulation.Under the situation of departure less than admissible value of working angle, owing to there is no need to proofread and correct the working angle of the intake valve 12 of each cylinder, thus finish this program, and do not handle especially.
On the other hand, as the result of determination in step 214, the departure of working angle is under the above situation of admissible value, can be judged as the deviation of the suction air quantity that generation can not be ignored between cylinder.In this case, owing to necessity of the working angle of proofreading and correct intake valve 12 is arranged, so the signal (step 218) of ECU30 output is used for notifying operation person or maintenance person " there is deviation in working angle " for each cylinder.The information of side-play amount that comprises the working angle of each cylinder in this signal.From the signal of ECU30 the working angle of the intake valve 12 of each cylinder suitably proofreaied and correct and cylinder between the deviation of suction air quantity be eliminated before output.
According to above program, identical with mode of execution 1, can correctly detect the deviation of the suction air quantity between cylinder.And, can detect the side-play amount of the working angle of each cylinder, in detail, can detect towards the side-play amount that sucks the big working angle side that air quantity relative datum value moves to superfluous lateral deviation.Therefore, according to present embodiment, can when each cylinder being proofreaied and correct the working angle (and lift) of intake valve 12, easily grasp its correcting value, thereby can promptly eliminate the deviation of the suction air quantity between cylinder.In addition, according to present embodiment, in detecting pattern, the change of fuel injection amount operation is only carried out a cylinder in a plurality of cylinders, so the change of exhaust air-fuel ratio is little, thus little to the influence of toxic emission.
In addition, in the above-described embodiment, realize " the emitted dose control mechanism " of the 5th invention by the processing of the above-mentioned steps 204,212,216 of being undertaken by ECU30, processing by above-mentioned steps 206,208,210 realizes the 5th " calculation mechanism " of inventing, and realizes " output mechanism " of the 5th invention by the processing of above-mentioned steps 214,218.
Mode of execution 3
Below, with reference to Fig. 8 embodiments of the present invention 3 are described.
As the dispersion detecting device of amount of suction air of embodiment of the present invention 3, can by in mode of execution 1, make the program of ECU30 execution graph 8 replace the program of Fig. 5 to realize.
In mode of execution 2,, detect the skew of the suction air quantity of this cylinder by only making the fuel injection amount change of specific cylinder in a plurality of cylinders.But, in each cylinder, sequentially burn, moment of torsion or rotating speed be subjected to be in now the cylinder in the combustion stroke combustion regime influence and change.Therefore, even as enforcement mode 1, make under the situation that the fuel injection amount of all cylinders similarly changes, by moment of torsion or change in rotational speed in the combustion stroke of each cylinder being monitored each cylinder and measure its vibration amplitude, also can hold the degrees of offset that sucks air quantity to each cylinder.
The program of carrying out by ECU30 in the program representation present embodiment of Fig. 8.In this program, according to above-mentioned basic skills each air cylinder detecting is gone out the skew of the working angle and the lift of intake valve 12, and have or not the judgement of necessity of corrective function angle and lift based on its result.
In the initial step 300 of program shown in Figure 8, judge whether present control mode has selected the detecting pattern of the deviation of detection effect angle and lift (the following working angle that only is called).Under the situation of having selected detecting pattern, the processing of execution in step 302.In step 302, operate the variable stigmatic opening transmission device 16 of each cylinder according to the command signal of issuing actuator 22 from ECU30, the intake valve 12 of each cylinder is set its working angle for the little working angle of regulation.And, intake valve 12 being set under the state of little working angle, carry out the idle running of internal-combustion engine 2.
In following step 304, the emitted dose of the fuel injection amount that makes all cylinders when chemically correct fuel turns round changes periodically to increasing side.The variation frequency of fuel injection amount is at this moment avoided the frequency field setting that the people is easy to feel.
In following step 306, the rotating speed when monitoring changes fuel injection amount periodically to each cylinder and with its buffer stock in storage.During being set to during the monitoring that the difference of the influence that can the burning combustion stroke of each cylinder is medium, each cylinder imposes on rotating speed and other cylinder confirms.If the monitoring time of rotating speed reaches the stipulated time, FFT etc. just carry out filtration treatment to the rotary speed data of buffer stock, and each cylinder is extracted out and the variance components (step 308) of the variation frequency same frequency of fuel injection amount.
In following step 310, at first, according to its amplitude of fluctuation measurement of the detected rotating speed of step 308.Make the emitted dose of fuel injection amount when chemically correct fuel turns round when increasing side and change periodically, relevant to the suction air quantity relative datum value the amplitude of the rotating speed of each cylinder monitoring and each cylinder (can realization theory air fuel ratio burn suction air quantity) to the side-play amount of superfluous side, it is big more to the side-play amount of superfluous side to suck air quantity, and the amplitude of rotating speed is big more.And the working angle in this cylinder is big more to the side-play amount of big working angle side, and the skew that sucks air quantity is big more.That is, working angle is to the big cylinder of the side-play amount of big working angle side, and the amplitude of the rotating speed that each cylinder is monitored is big more.In step 310, by will rotating speed amplitude and the pre-prepd correspondence table that each cylinder monitors being contrasted, calculate the side-play amount of the working angle that in each cylinder, produces, calculate the departure of the working angle between cylinder according to the side-play amount of the working angle of each cylinder of calculating.
In following step 312, whether the departure of the working angle that determining step 310 is calculated surpasses the admissible value of regulation.Under the situation of departure less than admissible value of working angle, owing to there is no need to proofread and correct the working angle of the intake valve 12 of each cylinder, thus finish this program, and do not handle especially.
On the other hand, under the departure of the result of determination of step 312, working angle is situation more than the admissible value, can be judged as the deviation of the suction air quantity that existence can not be ignored between cylinder.For this situation, owing to necessity of the working angle of proofreading and correct intake valve 12 is arranged, so the signal (step 314) of ECU30 output is used for notifying operation person or maintenance person " there is deviation in working angle " for each cylinder.The information of side-play amount that comprises the working angle of each cylinder in this signal.From the signal of ECU30 the working angle of the intake valve 12 of each cylinder suitably proofreaied and correct and cylinder between the deviation of suction air quantity be eliminated before output.
According to above program, can correctly detect the deviation of the suction air quantity between cylinder.And, can go out the side-play amount of working angle to each air cylinder detecting to big working angle side, suck air quantity relative datum value and move to superfluous lateral deviation this moment.Therefore, identical according to present embodiment with mode of execution 2, can when each cylinder being proofreaied and correct the working angle (and lift) of intake valve 12, easily grasp its correcting value, thereby can promptly eliminate the deviation of the suction air quantity between cylinder.
In addition, in the above-described embodiment, realize " the emitted dose control mechanism " of the 9th invention by the processing of the above-mentioned steps 304 of being undertaken by ECU30, processing by above-mentioned steps 306,308,310 realizes the 9th " calculation mechanism " of inventing, and realizes " output mechanism " of the 9th invention by the processing of above-mentioned steps 312,314.
Mode of execution 4
Below, with reference to Fig. 9 and Figure 10 embodiments of the present invention 4 are described.
The following realization of dispersion detecting device of amount of suction air energy as embodiment of the present invention 4, promptly, in mode of execution 1, the basic skills that the deviation of the suction air quantity of replacement Fig. 3 and Fig. 4 explanation detects makes ECU30 detect the working angle and the lift of intake valve 12 according to the method for Fig. 9 and Figure 10 explanation.
Below, use Fig. 9 and Figure 10 that the basic skills that the deviation of the suction air quantity of using in the present embodiment detects is described.Fig. 9 and Figure 10 are illustrated under the idling mode, make the emitted dose of fuel injection amount when chemically correct fuel turns round when reducing side and change periodically, air fuel ratio, moment of torsion, change in rotational speed in the cylinder.
Sucking air quantity in the cylinder (being called dense gas cylinder) that not enough lateral deviation is moved, when fuel injection amount was changed, air fuel ratio, moment of torsion, rotating speed changed respectively as illustrated in fig. 9 in the cylinder.At first, air fuel ratio changes to dense combustion side and lean-burn side periodically through chemically correct fuel in the cylinder.As use Fig. 2 illustrates, when air fuel ratio in the cylinder was positioned at dense combustion side, the sensitivity of the relative air fuel ratio of moment of torsion is little, and was relative therewith, and when air fuel ratio in the cylinder was positioned at the lean-burn side, the sensitivity of the relative air fuel ratio of moment of torsion was big.Therefore, in dense gas cylinder, when air fuel ratio in the cylinder was positioned at dense combustion side, moment of torsion was roughly certain; When air fuel ratio in the cylinder was positioned at the lean-burn side, the degree of moment of torsion and lean-burn reduced accordingly.Rotating speed presents the variation same with moment of torsion.In the cylinder in chemically correct fuel when running air fuel ratio from chemically correct fuel to dense combustion lateral deviation move many more, the vibration amplitude Δ Ne of the vibration amplitude Δ T of the moment of torsion shown in Fig. 9 and rotating speed is more little.
Relative therewith, sucking air quantity in the cylinder (being called the lean-burn cylinder) that superfluous lateral deviation is moved, when fuel injection amount was changed, air fuel ratio, moment of torsion, rotating speed changed respectively as illustrated in fig. 10 in the cylinder.At first, air fuel ratio is changing than ground regional cycle of chemically correct fuel by the lean-burn side in the cylinder.Because when air fuel ratio in the cylinder is positioned at the lean-burn side, the sensitivity of the relative air fuel ratio of moment of torsion is big, thus moment of torsion, rotating speed with cylinder in the roughly the same wave period ground variation of waveform of air fuel ratio.The vibration amplitude Δ Ne of the vibration amplitude Δ T of moment of torsion at this moment and rotating speed roughly becomes maximum value, and how many air fuel ratios moves from chemically correct fuel to the lean-burn lateral deviation in the cylinder during regardless of the chemically correct fuel running, all has certain substantially size.
In view of above reason, change periodically to reducing side by making the emitted dose of fuel injection amount when chemically correct fuel turns round, and monitoring moment of torsion or change in rotational speed at that time, can detect the existence that sucks the cylinder that air quantity moves to not enough lateral deviation.That is, sucking air quantity under the situation that the cylinder that not enough lateral deviation is moved exists, in all cylinders, the vibration amplitude the when vibration amplitude of moment of torsion, rotating speed is suitable with the suction air quantity is compared and is reduced.And, suck the cylinder that air quantity is moved to not enough lateral deviation if exist, then certainly exist on the contrary and suck the cylinder that air quantity is moved to superfluous lateral deviation.Therefore, the deviation that reduces to be illustrated in existence suction air quantity between cylinder of the vibration amplitude of moment of torsion or rotating speed.
And the degree that the suction air quantity in the dense gas cylinder is moved to not enough lateral deviation is big more, and the Oscillation Amplitude of moment of torsion, rotating speed is more little.If the degree that the suction air quantity in the dense gas cylinder is moved to not enough lateral deviation is big, we can say on the contrary that then the suction air quantity in the lean-burn cylinder is also big to the degrees of offset of superfluous side.That is, we can say that the deviation of the suction air quantity between cylinder is big.Therefore,, measure its Oscillation Amplitude, can correctly hold the extent of deviation of the suction air quantity between cylinder by detecting moment of torsion or change in rotational speed.
Identical with mode of execution 1, the flowchart text by Fig. 5 detects the program that the deviation of the working angle of intake valve 12 and lift is used according to above-mentioned basic skills.In initial step 100, judge whether to have selected detecting pattern, in the step of following 102,, carry out the idle running of internal-combustion engine 2 in that the intake valve 12 of each cylinder is set under the state of little working angle.
In following step 104, the emitted dose of the fuel injection amount that makes sparger 18 when chemically correct fuel turns round changes periodically to reducing side.After fuel injection amount is changed periodically, monitoring at that time rotating speed and with its buffer stock (step 106) in storage, extract out the rotary speed data after buffering is deposited and the variance components (step 108) of the variation frequency same frequency of fuel injection amount.
In following step 110, according to its amplitude of fluctuation measurement of the detected rotating speed of step 108.The departure of the suction air quantity between cylinder is big more, makes the amplitude of the rotating speed of the emitted dose of fuel injection amount when chemically correct fuel turns round when reducing side and change periodically more little.And the deviation of working angle is big more, and the deviation of the suction air quantity between cylinder is big more.That is, the departure of the working angle between cylinder is big more, and the amplitude of rotating speed is more little.In step 110,, calculate the departure of the working angle that produces between cylinder by rotating speed amplitude and the contrast of pre-prepd correspondence table that will measure.
In following step 112, judge whether the departure of the working angle of calculating surpasses the admissible value of regulation in step 110.Under the departure of working angle was situation more than the admissible value, output was used for the signal (step 114) of notice " there is deviation in working angle ".According to this signal,, can promptly eliminate the deviation of the suction air quantity between cylinder thus to the working angle (and lift) that each cylinder is proofreaied and correct intake valve 12.
In addition, in the above-described embodiment, the method that the deviation of the suction air quantity of use Fig. 9 and Figure 10 explanation detects also can be applicable to according to the working angle of the intake valve 12 of mode of execution 2 and mode of execution 3 and the deviation of lift and detect.As following simple declaration, this situation can go out the side-play amount of working angle relative datum value to little working angle side to each air cylinder detecting.
At first, be applicable under the situation about detecting that the emitted dose of the fuel injection amount that makes specific cylinder when chemically correct fuel turn round changes periodically to reducing side, and the amplitude of detection rotating speed at that time according to the deviation of mode of execution 2.The amplitude of detected rotating speed is relevant to the side-play amount of not enough side with the suction air quantity relative datum value of this cylinder, and big more to the side-play amount of not enough side, the amplitude of rotating speed is more little.And the working angle relative datum value in this cylinder is big more to the side-play amount of little working angle side, and the suction air quantity is big more to the skew of not enough side.That is, working angle is big more to the side-play amount of little working angle side, and the amplitude of rotating speed is more little.Therefore, by rotating speed amplitude and the contrast of pre-prepd correspondence table that will measure, can calculate the working angle that in this cylinder, produces side-play amount to little working angle side.
Be applicable under the situation about detecting that the emitted dose of the fuel injection amount that makes all cylinders when chemically correct fuel turns round changes periodically to reducing side according to the deviation of mode of execution 3, and to the amplitude of each air cylinder detecting rotating speed at that time.To each air cylinder detecting to the amplitude of rotating speed relevant with the suction air quantity relative datum value in each cylinder to the side-play amount of not enough side, big more to the side-play amount of not enough side, the amplitude of rotating speed is more little.And the working angle relative datum value in this cylinder is big more to the side-play amount of little working angle side, and the suction air quantity is big more to the skew of not enough side.That is, working angle is big more to the side-play amount of little working angle side, and the amplitude of rotating speed is more little.Therefore, by rotating speed amplitude and the contrast of pre-prepd correspondence table that will measure each cylinder, can calculate the working angle that in each cylinder, produces side-play amount to little working angle side.
Mode of execution 5
Below, with reference to Figure 11 embodiments of the present invention 5 are described.
As the dispersion detecting device of amount of suction air of embodiment of the present invention 5, can by in mode of execution 1, the program that makes ECU30 carry out Figure 11 replaces the program of Fig. 5 to realize.
Deviation according to mode of execution 2 and mode of execution 3 detects, and can go out the side-play amount of working angle relative datum value to big working angle side to each air cylinder detecting.And, as implementing to illustrate in the mode 4, the method that the deviation of the suction air quantity by will using Fig. 9 and Figure 10 explanation detects is adapted to during deviation according to mode of execution 2 and mode of execution 3 detects, and can go out the side-play amount of working angle relative datum value to little working angle to each air cylinder detecting.Therefore, if make up this two kinds of methods, be the skew of big working angle side, or be under the situation of skew of little working angle side in the skew relative datum value of working angle, can be to its side-play amount of each air cylinder detecting.
For example, for situation about using according to the deviation detecting method of mode of execution 2, the emitted dose of the fuel injection amount that makes specific cylinder when chemically correct fuel turns round changes periodically to increasing side, and then, the emitted dose when chemically correct fuel turns round changes periodically to reducing side.Like this, the skew relative datum value of the working angle that produces in specific cylinder is the skew of big working angle side, or is under the situation of skew of little working angle side, can both correctly detect this side-play amount.As a result, when each cylinder being proofreaied and correct the working angle (and lift) of intake valve 12, can more correctly hold its correcting value.
And, for situation about using according to the deviation detecting method of mode of execution 3, the emitted dose of fuel injection amount when chemically correct fuel turns round changed periodically to increasing side, and to each air cylinder detecting rotating speed, then, the emitted dose of fuel injection amount when chemically correct fuel turns round changed periodically to reducing side, and to each cylinder monitoring rotating speed.Like this, the existence of dense gas cylinder and lean-burn cylinder can be detected, and, its side-play amount can be correctly detected no matter the skew of the working angle of each cylinder is big working angle side or little working angle side.
, for the emitted dose that makes fuel injection amount when chemically correct fuel turns round to reducing the situation that side changes, as shown in figure 10, in the original air quantity that sucks just in the lean-burn cylinder that superfluous lateral deviation is moved, the interior further lean-burnization of air fuel ratio of cylinder.Owing in air fuel ratio, there is the incendivity scope that fuel can normal combustion, so, in this lean-burn cylinder, may produce the situation of catching fire when air fuel ratio in the cylinder too during lean-burn.Therefore, though be necessary the mode that is no more than the lean-burn side boundary (lean-burn boundary) of incendivity scope with air fuel ratio in the cylinder in the lean-burn cylinder fuel injection amount is changed, but, when fuel injection amount when the amplitude of variation that reduces side reduces, probably can not correctly detect and suck the dense gas cylinder that air quantity is moved to not enough lateral deviation.
Catch fire phenomenon in the lean-burn cylinder and correctly to detect dense gas cylinder in order not cause, only the emitted dose of fuel injection amount when chemically correct fuel turn round got final product to reducing the side variation at the cylinder beyond the lean-burn cylinder.That is, before the detection of dense gas cylinder, detect the lean-burn cylinder, afterwards, carry out the detection of dense gas cylinder for the cylinder outside the lean-burn cylinder, to each cylinder.Like this, can correctly detect dense gas cylinder, and there is no need to reduce fuel injection amount to the amplitude of variation that reduces side.
The program of carrying out by ECU30 in the program representation present embodiment of Figure 11.In this program, as previously mentioned, at first each air cylinder detecting is sucked the skew of air quantity to superfluous side, then,, each air cylinder detecting is sucked the skew of air quantity to not enough side to sucking the cylinder of air quantity beyond the lean-burn cylinder that superfluous lateral deviation is moved.And, judge the necessity that has or not corrective function angle and lift according to its result.
In the initial step 400 of program shown in Figure 11, judge whether present control mode has selected the detecting pattern of the deviation of detection effect angle and lift (the following working angle that only claims).Under the situation of having selected detecting pattern, the processing of execution in step 402.In step 402, operate the variable stigmatic opening transmission device 16 of each cylinder by the command signal of issuing actuator 22 from ECU30, the intake valve 12 of each cylinder is set its working angle for the little working angle of regulation.And, intake valve 12 being set under the state of little working angle, carry out the idle running of internal-combustion engine 2.
In following step 404, make counter n initialization (n=1).This counter n represents to make the cylinder number of the specific cylinder that fuel injection amount changes periodically.In the present embodiment, identical with mode of execution 2, adopt following method, that is, and moment of torsion or change in rotational speed when detection changes fuel injection amount to each cylinder, and measure its Oscillation Amplitude, grasp the degrees of offset that sucks air quantity in each cylinder thus.
In step 406, the emitted dose of the fuel injection amount that makes specific cylinder (n cylinder) when chemically correct fuel turns round changes periodically to increasing side.And at that time moment of torsion or change in rotational speed of monitoring calculated the working angle that the produces side-play amount to big working angle side in this specific cylinder according to its Oscillation Amplitude.In addition, the detailed content of the processing of implementing in step 406 be the identical content of processing that illustrates in to 210 with step 204 in Fig. 7 program.
In step 408, judged whether to all air cylinder detecting the skew of working angle to big working angle side.When the cylinder of residual not detection, advance to step 410, make the specific cylinder of the change operation of carrying out fuel injection amount become the n+1 cylinder from the n cylinder.After the processing of step 408, carry out the processing of step 406 once more.In step 406, the emitted dose of the fuel injection amount that only makes the specific cylinder that step 410 sets when chemically correct fuel turn round changes periodically to the increase side.Before setting up, the condition of the detection end of all cylinders, step 408 repeats above circulation.
The condition of step 408 makes counter n initialization (n=1) (step 412) after setting up once more.In following step 414, judge whether present specific cylinder (the 1st cylinder) is to suck the lean-burn cylinder that air quantity is moved to superfluous lateral deviation, in other words, whether be the big cylinder of working angle that working angle is moved to big working angle lateral deviation.Whether the 1st cylinder is that the judgement of lean-burn cylinder is carried out according to the testing result of step 406.In judged result is that the 1st cylinder is under the situation of lean-burn cylinder, advances to step 420, makes specific cylinder become the 2nd cylinder from the 1st cylinder.Whether at specific cylinder after changing, carry out the judgement of step 414 once more, be the judgement of lean-burn cylinder to the specific cylinder of new settings.
Only the judged result in step 414 is that specific cylinder (n cylinder) is not under the situation of lean-burn cylinder, the processing of execution in step 416.In step 416, the emitted dose of the fuel injection amount that only makes specific cylinder when chemically correct fuel turns round changes periodically to reducing side.And at that time moment of torsion or change in rotational speed of monitoring with its vibration amplitude and the contrast of pre-prepd correspondence table, calculated the working angle that the produces side-play amount to little working angle side in this specific cylinder.
In step 416, judged whether to all air cylinder detecting beyond the lean-burn cylinder skew of working angle to little working angle side.When the residual cylinder that does not detect, advance to step 420, make the specific cylinder of the change operation of carrying out fuel injection amount become the cylinder of ensuing number.After the processing of step 420, judge in step 414 whether present specific cylinder is the lean-burn cylinder.In judged result is that specific cylinder is under the situation of lean-burn cylinder, returns step 420, makes specific cylinder become the cylinder of ensuing number once more.And, only be judged as under the situation of lean-burn cylinder the processing of execution in step 416 at the specific cylinder of setting again by step 420.The detection end of all cylinders beyond the lean-burn cylinder, the condition of step 418 repeat above circulation before setting up.
Under the situation that the condition of step 418 is set up, carry out the judgement of step 422.In step 422, to the side-play amount of big working angle side and the working angle each cylinder calculated by the circulation of carrying out above-mentioned steps 414,416,418,420 side-play amount, calculate the departure of the working angle between cylinder according to the working angle of each cylinder being calculated by the circulation of carrying out above-mentioned steps 406,408,410 to little working angle side.And, judge whether the departure of the working angle of calculating surpasses the admissible value of regulation.Under the situation of departure less than admissible value of working angle, owing to there is no need to proofread and correct the working angle of the intake valve 12 of each cylinder, thus finish this program, and do not handle especially.
On the other hand, be that the departure of working angle is under the situation more than the admissible value in the result of determination of step 422, can be judged as the deviation of the suction air quantity that existence can not be ignored between cylinder.For this situation, owing to necessity of the working angle of proofreading and correct intake valve 12 is arranged, so the signal (step 424) of ECU30 output is used for notifying operation person or maintenance person " there is deviation in working angle " for each cylinder.The information of side-play amount that comprises the working angle of each cylinder in this signal.From the signal of ECU30 the working angle of the intake valve 12 of each cylinder suitably proofreaied and correct and cylinder between the deviation of suction air quantity be eliminated before output.
According to above program, can correctly detect working angle in the lean-burn cylinder to the side-play amount of big working angle side, and, can not cause catching fire phenomenon and correctly detect working angle in the dense gas cylinder in this lean-burn cylinder to the side-play amount of little working angle side.Therefore, according to present embodiment, can when each cylinder being proofreaied and correct the working angle (and lift) of intake valve 12, more correctly grasp its correcting value, thereby can more promptly eliminate the deviation of the suction air quantity between cylinder.
In addition, in the above-described embodiment, the processing by the above-mentioned steps 406 of being undertaken by ECU30 realizes that " the 1st emitted dose control mechanism " of the 13rd invention reaches " the 1st calculation mechanism ".And the processing by the above-mentioned steps 414,416 carried out by ECU30 realizes that " the 2nd emitted dose control mechanism " of the 13rd invention reaches " the 2nd calculation mechanism ".And, realize by the processing of the above-mentioned steps 422,424 carried out by ECU30 by " output mechanism " of the 13rd invention.
Other mode of execution
Though above embodiments of the present invention are illustrated, the invention is not restricted to above-mentioned mode of execution, in the scope of non-migration aim of the present invention, can carry out various distortion.For example, can carry out following distortion.
In the respective embodiments described above, though in the idle running of internal-combustion engine 2, carry out detecting pattern, when turning round, sub load also can carry out detecting pattern.For this situation, the preferred change that replaces measuring the change of rotating speed and measure moment of torsion is according to the deviation of the working angle between its vibration amplitude detection cylinder.The generation moment of torsion of internal-combustion engine 2 is calculated etc. by the angular velocity of firing pressure, bent axle 28, can obtain by known method.In addition, the execution of detecting pattern is not limited to moment of torsion for roughly certain normal state, even also can carry out under the transient state of change in torque.If foregoingly carry out filtration treatment by FFT etc. like that, then can from the variation of moment of torsion, extract out and the variance components of the variation frequency same frequency of fuel injection amount.
And, in the respective embodiments described above, although the emitted dose of fuel injection amount when chemically correct fuel turns round changed periodically to increasing side or reducing side, also only a period of time ground to increasing side or reducing the side variation.In this case and since in internal-combustion torque, rotating speed, occur with cylinder between the corresponding variation of deviation of suction air quantity, so, can detect the deviation of the suction air quantity between cylinder by measuring its amplitude of variation.
And in the respective embodiments described above, although the present invention is applied in the internal-combustion engine that has variable stigmatic opening transmission device 16 on intake valve 12, the present invention also is applicable to the internal-combustion engine with variable stigmatic opening transmission device 16.In this internal-combustion engine, by being suitable for the present invention, can detect the deviation of the suction air quantity between the cylinder of assembly error of following intake valve 12 etc., and, can promptly eliminate the deviation of the suction air quantity between cylinder by in each cylinder, the assembling of intake valve 12 being proofreaied and correct according to testing result.And, for the internal-combustion engine that in each cylinder, is provided with air intake control valve,, can detect the deviation of the aperture of air intake control valve by detect the deviation that sucks air quantity by the present invention.
Claims (15)
1. dispersion detecting device of amount of suction air is used for detecting at the internal-combustion engine with a plurality of cylinders the deviation of the suction air quantity between cylinder, it is characterized in that having:
The emitted dose control mechanism makes the emitted dose of fuel injection amount when chemically correct fuel turns round change to increasing side or reducing the side either side;
Calculation mechanism is obtained moment of torsion or change in rotational speed amplitude when by described emitted dose control mechanism fuel injection amount being changed; And
Output mechanism is exported moment of torsion or change in rotational speed amplitude that described calculation mechanism is obtained as the desired value of the extent of deviation of the suction air quantity between the expression cylinder.
2. dispersion detecting device of amount of suction air as claimed in claim 1 is characterized in that having:
Mechanism relatively compares emitted dose described amplitude of variation and the specified reference value when increasing side variation of fuel injection amount when chemically correct fuel turn round described emitted dose control mechanism; And
Decision mechanism, when described amplitude of variation surpassed described reference value, the deviation that is judged as the suction air quantity between cylinder surpassed permissible level.
3. dispersion detecting device of amount of suction air as claimed in claim 1 is characterized in that having:
Mechanism relatively compares emitted dose described amplitude of variation and the specified reference value when reducing side variation of fuel injection amount when chemically correct fuel turn round described emitted dose control mechanism; And
Decision mechanism, when described amplitude of variation was lower than described reference value, the deviation that is judged as the suction air quantity between cylinder surpassed permissible level.
4. as each described dispersion detecting device of amount of suction air in the claim 1 to 3, it is characterized in that,
Described emitted dose control mechanism constitutes, and makes the emitted dose of fuel injection amount when chemically correct fuel turns round increase side or established amount reduces the side cyclically-varying to established amount,
Described calculation mechanism constitutes, and extracts the variance components with the variation frequency same frequency of fuel injection amount from moment of torsion or rotation speed change out, and the amplitude of the variance components extracted out is obtained as described amplitude of variation.
5. dispersion detecting device of amount of suction air is used for detecting at the internal-combustion engine with a plurality of cylinders the deviation of the suction air quantity between cylinder, it is characterized in that having:
Emitted dose control mechanism, the fuel injection amount that makes the specific cylinder in the described a plurality of cylinder emitted dose when chemically correct fuel turns round changes to increasing side or reducing the side either side;
Calculation mechanism is obtained moment of torsion or change in rotational speed amplitude when by described emitted dose control mechanism the fuel injection amount of described specific cylinder being changed; And
Output mechanism is exported moment of torsion or change in rotational speed amplitude that described calculation mechanism is obtained as the desired value of the degrees of offset of the suction air quantity of the described specific cylinder of expression.
6. dispersion detecting device of amount of suction air as claimed in claim 5 is characterized in that having:
Mechanism relatively, emitted dose described amplitude of variation and the specified reference value when increasing side variation of the fuel injection amount that described emitted dose control mechanism is made described specific cylinder when chemically correct fuel turn round compares; And
Decision mechanism, when described amplitude of variation surpassed described reference value, the suction air quantity that is judged as in the described specific cylinder surpassed permissible level to the skew of superfluous side.
7. dispersion detecting device of amount of suction air as claimed in claim 5 is characterized in that having:
Mechanism relatively, emitted dose described amplitude of variation and the specified reference value when reducing side variation of the fuel injection amount that described emitted dose control mechanism is made described specific cylinder when chemically correct fuel turn round compares; And
Decision mechanism, when described amplitude of variation was lower than described reference value, the suction air quantity that is judged as in the described specific cylinder surpassed permissible level to the skew of not enough side.
8. as each described dispersion detecting device of amount of suction air in the claim 5 to 7, it is characterized in that,
Described emitted dose control mechanism constitutes, and the emitted dose of the fuel injection amount that makes described specific cylinder when chemically correct fuel turns round increases side or established amount reduces the side cyclically-varying to established amount,
Described calculation mechanism constitutes, and extracts the variance components with the variation frequency same frequency of the fuel injection amount of described specific cylinder from moment of torsion or rotation speed change out, and the amplitude of the variance components extracted out is obtained as described amplitude of variation.
9. dispersion detecting device of amount of suction air is used for detecting at the internal-combustion engine with a plurality of cylinders the deviation of the suction air quantity between cylinder, it is characterized in that having:
The emitted dose control mechanism makes the emitted dose of fuel injection amount when chemically correct fuel turns round change to increasing side or reducing the side either side;
Calculation mechanism is obtained moment of torsion or change in rotational speed amplitude when by described emitted dose control mechanism fuel injection amount being changed to each cylinder; And
Output mechanism, the moment of torsion of each cylinder that described calculation mechanism is obtained or change in rotational speed amplitude are as the desired value output of the degrees of offset that sucks air quantity in each cylinder of expression.
10. dispersion detecting device of amount of suction air as claimed in claim 9 is characterized in that having:
Mechanism relatively, each cylinder relatively compares emitted dose described amplitude of variation and the specified reference value when increasing side variation of fuel injection amount when chemically correct fuel turn round described emitted dose control mechanism; And
Decision mechanism, when described amplitude of variation surpassed described reference value, the suction air quantity that is judged as in this cylinder surpassed permissible level to the skew of superfluous side.
11. dispersion detecting device of amount of suction air as claimed in claim 9 is characterized in that, has:
Mechanism relatively, each cylinder relatively compares emitted dose described amplitude of variation and the specified reference value when reducing side variation of fuel injection amount when chemically correct fuel turn round described emitted dose control mechanism; And
Decision mechanism, when described amplitude of variation was lower than described reference value, the suction air quantity that is judged as in this cylinder surpassed permissible level to the skew of not enough side.
12. as each described dispersion detecting device of amount of suction air in the claim 9 to 11, it is characterized in that,
Described emitted dose control mechanism constitutes, and makes the emitted dose of fuel injection amount when chemically correct fuel turns round increase side or established amount reduces the side cyclically-varying to established amount,
Described calculation mechanism constitutes, and to extracting the variance components with the variation frequency same frequency of fuel injection amount the moment of torsion of each cylinder sampling or the change in rotational speed out, the amplitude of the variance components extracted out is obtained as the described amplitude of variation in each cylinder.
13. a dispersion detecting device of amount of suction air is used for it is characterized in that having in the deviation with the suction air quantity between the internal-combustion engine detection cylinder of a plurality of cylinders:
The first emitted dose control mechanism, the fuel injection amount that makes the specific cylinder in the described a plurality of cylinder emitted dose when chemically correct fuel turns round changes to increasing side;
First calculation mechanism is obtained moment of torsion or change in rotational speed amplitude when by the described first emitted dose control mechanism fuel injection amount of described specific cylinder being changed;
The second emitted dose control mechanism surpasses under the situation of specified reference value at moment of torsion that described first calculation mechanism is obtained or change in rotational speed amplitude, and the emitted dose of the fuel injection amount that makes described specific cylinder when chemically correct fuel turn round is to reducing the side variation;
Second calculation mechanism is obtained moment of torsion or change in rotational speed amplitude when by the described second emitted dose control mechanism fuel injection amount of described specific cylinder being changed; And
Output mechanism, moment of torsion that described first calculation mechanism is obtained or change in rotational speed amplitude, and the moment of torsion obtained of described second calculation mechanism or change in rotational speed amplitude as the desired value output of the degrees of offset of the suction air quantity of the described specific cylinder of expression.
14. as each described dispersion detecting device of amount of suction air in the claim 4,8,12, it is characterized in that,
Described emitted dose control mechanism makes the fuel injection amount cyclically-varying with the frequency outside the appreciable frequency band of the person.
15. as each described dispersion detecting device of amount of suction air in the claim 1 to 14, it is characterized in that,
Have change-over mechanism, its deviation with the suction air quantity between cylinder is scaled the working angle of the intake valve between cylinder and/or the deviation of lift.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103547783A (en) * | 2011-05-16 | 2014-01-29 | 丰田自动车株式会社 | Air/fuel ratio imbalance detection device for internal combustion engine |
| CN108699982A (en) * | 2016-02-24 | 2018-10-23 | 欧陆汽车有限责任公司 | Method for determining the air quality in internal combustion engine |
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| JPH0932710A (en) * | 1995-07-21 | 1997-02-04 | Mitsubishi Motors Corp | Ignition timing control method and device thereof |
| US6532935B2 (en) * | 1999-11-10 | 2003-03-18 | Daimlerchrysler Ag | Method of operating an internal combustion engine |
| DE10006161A1 (en) * | 2000-02-11 | 2001-08-23 | Bosch Gmbh Robert | Determining individual cylinder control parameter differences for multi-cylinder internal combustion engine involves determining individual cylinder filling differences |
| JP4339572B2 (en) * | 2002-08-21 | 2009-10-07 | 株式会社デンソー | Control device for internal combustion engine |
| JP3951846B2 (en) * | 2002-07-25 | 2007-08-01 | 日産自動車株式会社 | Valve timing correction control device for internal combustion engine |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103547783A (en) * | 2011-05-16 | 2014-01-29 | 丰田自动车株式会社 | Air/fuel ratio imbalance detection device for internal combustion engine |
| CN103547783B (en) * | 2011-05-16 | 2016-04-27 | 丰田自动车株式会社 | The air/fuel ratio imbalance detection device of internal-combustion engine |
| CN108699982A (en) * | 2016-02-24 | 2018-10-23 | 欧陆汽车有限责任公司 | Method for determining the air quality in internal combustion engine |
| CN108699982B (en) * | 2016-02-24 | 2021-07-09 | 欧陆汽车有限责任公司 | Method for determining air quality in internal combustion engine |
| US11092104B2 (en) | 2016-02-24 | 2021-08-17 | Vitesco Technologies GmbH | Method for determining an air mass in an internal combustion engine |
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