CN104179585B - The control method and multicylinder engine device of multicylinder engine - Google Patents
The control method and multicylinder engine device of multicylinder engine Download PDFInfo
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- CN104179585B CN104179585B CN201310203287.3A CN201310203287A CN104179585B CN 104179585 B CN104179585 B CN 104179585B CN 201310203287 A CN201310203287 A CN 201310203287A CN 104179585 B CN104179585 B CN 104179585B
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Abstract
The present invention proposes a kind of control method of multicylinder engine, and methods described includes：The cylinder pressure signal of each cylinder and corresponding engine crankshaft corner signal are gathered in a working cycles；Signal and the corner signal is pressed to calculate fired state information of each cylinder in the working cycles according to the cylinder；And the fired state information based on each cylinder balances the fired state of each cylinder by adjusting corresponding control parameters of engine for the different combustion modes of engine in next working cycles.On the other hand, present invention also offers the multicylinder engine device for performing the above method.
Description
Technical field
The present invention relates to engine control technologies, and more particularly, to the control method for multicylinder engine with
And perform the multicylinder engine device of this method.
Background technology
Modern Vehicle Engine is more using such as four cylinders, six cylinders, the multicylinder engine of eight cylinder engine.The cylinder of engine
Number is more, and crank rotation is more uniform, and vibration is also just smaller, but manufacturing cost increase.The cylinder of multicylinder engine be arranged with it is in upright arrangement,
V-arrangement and the form such as horizontally-opposed, this depends on the factors such as installation, manufacturing cost and the type of cooling.
For the multicylinder engine using gasoline due to the state change of air-fuel mixture in cylinder, can be produced in different circulations
Different burn results, while difference cylinder can also show lack of uniformity under identical control parameter.This phenomenon
It is all relatively conventional in spark-ignition engine and compression ignition engine.The lack of uniformity of multicylinder engine can be to the control of engine
Bring challenges, can cause engine section circulate catch fire, efficiency of combustion reduce or pinking phenomenon, utilize traditional control
Means are often difficult to the lack of uniformity for detecting and eliminating each cylinder.
The content of the invention
It is at least one in order to what is solved the above problems, the present invention propose according to cylinder pressure sensor calculate combustion information come
The method for controlling each cylinder parameter of multicylinder engine, according to each cylinder combustion information and state, adjusts relevant parameter so that each cylinder in real time
It is operated in stable and efficient state.
In one aspect of the invention, there is provided a kind of control method of multicylinder engine, methods described include：At one
The cylinder pressure signal of each cylinder of collection and corresponding engine crankshaft corner signal in working cycles；According to the cylinder press signal and
The corner signal calculates fired state information of each cylinder in the working cycles；And followed in next work
The fired state information based on each cylinder is started accordingly for the different combustion modes of engine by adjustment in ring
Machine control parameter balances the fired state of each cylinder.
According to some embodiments of the present invention, the fired state information includes 50% heat liberation rate, heat release rate angle of each cylinder, and
And in the case where engine is in ignition mode, the 50% heat liberation rate, heat release rate angle based on each cylinder is by adjusting each cylinder
Ignition advance angle balances the fired state of each cylinder.
According to some embodiments of the present invention, adjustment ignition advance angle includes determining 50% heat liberation rate, heat release rate angle of each cylinder
In median；And it is more than the cylinder of the median for 50% heat liberation rate, heat release rate angle, increases its ignition advance angle；For 50%
Heat liberation rate, heat release rate angle is less than the cylinder of the median, reduces its ignition advance angle.
According to some embodiments of the present invention, the fired state information also includes the rate of pressure rise of each cylinder, and
And in the case where engine is in ignition mode, also based on the rate of pressure rise of each cylinder by adjusting each cylinder
Ignition advance angle balance the fired state of each cylinder.
According to some embodiments of the present invention, by the rate of pressure rise of each cylinder compared with predetermined threshold；And for
The rate of pressure rise is more than the cylinder of predetermined threshold, reduces its ignition advance angle.
According to some embodiments of the present invention, the fired state information includes the mean effective pressure of each cylinder, and
And in the case where engine is in homogeneity compression-ignition pattern or thin ignition mode, the mean effective pressure based on each cylinder
Power balances the fired state of each cylinder by adjusting the distributive value of each cylinder, wherein adjusting the oil spout of each cylinder respectively
Amount makes the mean effective pressure of each cylinder close to target mean effective pressure.
According to some embodiments of the present invention, the fired state information also includes 50% heat liberation rate, heat release rate angle of each cylinder,
And in the case where engine is in homogeneity compression-ignition pattern, also based on the 50% heat liberation rate, heat release rate angle by adjusting each cylinder
Intake air temperature or distributive value balance the fired state of each cylinder.
According to some embodiments of the present invention, the median in 50% heat liberation rate, heat release rate angle of each cylinder is determined；And for
50% heat liberation rate, heat release rate angle is more than the cylinder of the median, improves its intake air temperature or increases its distributive value；For 50% heat release
Rate angle is less than the cylinder of the median, reduces its intake air temperature or reduces its distributive value.
According to some embodiments of the present invention, the fired state information also includes the rate of pressure rise of each cylinder, and
And in the case where engine is in compression-ignition mode, also based on the rate of pressure rise of each cylinder by adjusting each cylinder
Intake air temperature or distributive value balance the fired state of each cylinder.
According to some embodiments of the present invention, adjusting intake air temperature or distributive value includes：By the pressure liter of each cylinder
High rate is compared with predetermined threshold；And it is more than the cylinder of predetermined threshold for the rate of pressure rise, reduces its intake air temperature or subtract
Its few distributive value.
According to some embodiments of the present invention, the fired state information also includes 50% heat liberation rate, heat release rate angle of each cylinder,
And in the case where engine is in thin ignition mode, the 50% heat liberation rate, heat release rate angle also based on each cylinder is by adjusting simultaneously
The ignition advance angle and distributive value of whole each cylinder balance the fired state of each cylinder.
It is big for the deviation of mean effective pressure and the target mean effective pressure according to some embodiments of the present invention
In the cylinder of predetermined threshold, the cylinder is set to enter corresponding fault diagnosis and dealing state.
In another aspect of this invention, additionally provide a kind of multicylinder engine device, described device include crankshaft sensor,
Corresponding with each cylinder cylinder pressure sensor and engine controller, wherein the engine controller includes：Data acquisition
Unit, the cylinder for gathering engine crankshaft corner signal and each cylinder in a working cycles press signal；State meter
Unit is calculated, for pressing signal and the corner signal to calculate combustion of each cylinder in the working cycles according to the cylinder
Burn status information；And state balance unit, for the fired state based on each cylinder in next working cycles
Information makes the fired state of each cylinder for the different combustion modes of engine by adjusting corresponding control parameters of engine
Balance.
Accurate measurement and control of the invention by increasing cylinder pressure sensor to realize to in-cylinder combustion process.Engine control
Device processed can gather the signal of cylinder pressure sensor, and it is analyzed and calculated, and be followed so as to obtain each cylinder work at present of engine
The fired state information of ring, and the control parameter of each cylinder of subsequent cycle is adjusted according to fired state, each cylinder work is eliminated with this
The lack of uniformity of work, improve the efficiency of combustion and run stability of engine.
Brief description of the drawings
The present invention foregoing and other target, feature and advantage according to it is following to embodiments of the invention in particular
Bright to will be apparent, these embodiments are illustrated in the accompanying drawings.
Fig. 1 shows the structure of multicylinder engine device according to an embodiment of the invention.
Fig. 2 is the flow chart of the control method of multicylinder engine according to an embodiment of the invention.
Embodiment
The present invention is further described below in conjunction with the drawings and specific embodiments.It should be noted that in accompanying drawing
Each structure simply schematically illustrates, and to make those of ordinary skill in the art that the principle of the present invention be best understood, it is not necessarily
It is drawn to scale.
Fig. 1 shows the structure of multicylinder engine device 100 according to an embodiment of the invention.As shown in figure 1, except one
As multicylinder engine necessary construction outside, multicylinder engine device 100 can generally include crankshaft sensor, with each gas
Cylinder pressure sensor corresponding to cylinder and engine controller.For example, for four cylinder engine, there can be four cylinder pressure sensor 1-
4, it is corresponding with each cylinder respectively.It should be understood by those skilled in the art that except the part shown in Fig. 1, the present invention is carried
The multicylinder engine device of confession at least possesses the basic structure of conventional multicylinder engine and can at least realized to conventional more
Basic function required by Cylinder engine, for simplicity, this is not repeated herein.
With continued reference to Fig. 1, engine controller in multicylinder engine device 100 according to an embodiment of the invention can be with
Including：The effect of data acquisition unit, state calculating unit and state adjustment unit, wherein unit will be tied hereinafter
Fig. 2 is closed to be described.
Fig. 2 is the flow chart of the control method of multicylinder engine according to an embodiment of the invention.In order to realize engine
Functioning equalization between multiple cylinders, engine controller can be by data acquisition unit at one in step slo first
The cylinder pressure signal of each cylinder is gathered from each cylinder pressure sensor and gather corresponding send out from crankshaft sensor in working cycles
Motivation corner signal.In practice, cylinder pressure signal can be stored as array according to engine crankshaft corner signal
So as to subsequent treatment.In each working cycles, for single cylinder, one or more groups of cylinder pressure signals can be gathered as needed
With corresponding corner signal.For multigroup signal in a working cycles, the statistical means such as averaging can be used to enter
Row processing.
Then in step S20, engine controller can press signal by state calculating unit according to the cylinder gathered
Fired state information of each cylinder in corresponding working cycles is calculated with corner signal.For example, each cylinder
Fired state information can include 50% heat liberation rate, heat release rate angle (CA50) of each cylinder, the rate of pressure rise of each cylinder, the most vat of each cylinder
Interior pressure, mean effective pressure of each cylinder etc..
Finally in step s 30, engine controller can by state balance unit in next working cycles base
The different combustion modes of engine are directed to by adjusting corresponding control parameters of engine in the fired state information of each cylinder
Balance the fired state of each cylinder.
For example, under the ignition mode of engine, mixture combustion is mainly controlled by time of ignition, can be according to each
50% heat liberation rate, heat release rate angle state of cylinder realizes the multi-cylinder balancing work of engine.Therefore, state calculating unit can calculate each cylinder
50% heat liberation rate, heat release rate angle (CA50), i.e., each cylinder crank angle corresponding when heat liberation rate, heat release rate reaches 50%.State adjustment is single
Member can balance the fired state of each cylinder based on this parameter by adjusting the ignition advance angle of each cylinder.
According to one embodiment of present invention, state adjustment unit can determine the 50% of each cylinder gathered first
The median of heat liberation rate, heat release rate angle.It is more than the cylinder of the median for 50% heat liberation rate, heat release rate angle, engine controller can increase this
The ignition advance angle of cylinder, thus reduce the circular wave of engine.It is less than median conversely, for 50% heat liberation rate, heat release rate angle
Cylinder, i.e., when 50% heat liberation rate, heat release rate angle is excessively postponed, engine controller can reduce the ignition advance angle of the cylinder, make
50% heat liberation rate, heat release rate angular advance is obtained, reduces engine consumption.When 50% heat liberation rate, heat release rate angle (CA50) is excessively postponed, engine control
Ignition advance angle will be further increased in device so that 50% heat liberation rate, heat release rate angular advance, reduces engine consumption, and reduces engine
Circular wave.
Under the ignition mode of engine, the rate of pressure rise is also the important references index of engine control, if pressure
Rate of rise is excessive, and engine has the risk of pinking and detonation.Therefore, state calculating unit can also calculate the pressure of each cylinder
Reference frame of the rate of rise as regulation multi-cylinder balance.In this case, state adjustment unit is also based on each cylinder
The rate of pressure rise balance the fired state of each cylinder by adjusting the ignition advance angle of each cylinder.For example, shape
State adjustment unit can be by the rate of pressure rise of each cylinder compared with predetermined threshold.It is more than predetermined threshold for the rate of pressure rise
Cylinder, engine controller can reduce its ignition advance angle, the rate of pressure rise of each cylinder thus is held at into one
In fixed limit value.
Under the average compression-ignition mode of engine, the burning of gaseous mixture is mainly by the temperature of combustion chamber during near
Degree is determined, and the load of engine and output torque are mainly determined by distributive value.In this mode, can be according to the 50% of each cylinder
At least one in heat liberation rate, heat release rate angle and mean effective pressure realizes the multi-cylinder balancing work of engine.Preferably, in average
Under compression-ignition mode, each cylinder can be balanced according to two parameters of 50% heat liberation rate, heat release rate angle and mean effective pressure simultaneously
Control.
On the one hand, state calculating unit can calculate 50% heat liberation rate, heat release rate angle of each cylinder, and state adjustment unit can
Put down the fired state of each cylinder by the intake air temperature or distributive value for adjusting each cylinder based on 50% heat liberation rate, heat release rate angle
Weighing apparatus.
According to one embodiment of present invention, state adjustment unit can be determined in 50% heat liberation rate, heat release rate angle of each cylinder
Median.For 50% heat liberation rate, heat release rate angle be more than the median cylinder, engine controller can improve its intake air temperature or
Person increases its distributive value, reduces fluctuation of each cylinder in circulation.It is less than conversely, for 50% heat liberation rate, heat release rate angle among this
The cylinder of value, that is, when CA50 is excessively postponed, engine controller can reduce its intake air temperature or reduce its distributive value,
Reduce fluctuation of each cylinder in circulation.
On the other hand, state calculating unit can calculate the mean effective pressure of each cylinder, and state adjustment unit
The fired state of each cylinder can be balanced based on the mean effective pressure by adjusting the distributive value of each cylinder.
According to one embodiment of present invention, in order to realize each cylinder Differential Output torque, engine controller can basis
Each cylinder mean effective pressure sets target value of engine of target, is put down by the way of distributive value is adjusted to each cylinder being calculated
Equal effective pressure is adjusted so that it is attached that mean effective pressure of each cylinder in each circulation is maintained at target mean effective pressure
Closely.If some cylinder there occurs it is continuous catch fire or actual average effective pressure value and desired value sustained deviation it is larger, make
The cylinder enters corresponding fault diagnosis and dealing state.
As it was previously stated, the rate of pressure rise is also the important references index of engine control, and if the rate of pressure rise is excessive, hair
Motivation has the risk of pinking and detonation.Therefore, under compression-ignition mode, state calculating unit can also preferably calculate each cylinder
The rate of pressure rise as regulation multi-cylinder balance reference frame.Correspondingly, state adjustment unit is also based on each cylinder
The rate of pressure rise balance the fired state of each cylinder by the intake air temperature or distributive value that adjust each cylinder.Citing
For, state adjustment unit can be by the rate of pressure rise of each cylinder compared with predetermined threshold.It is more than for the rate of pressure rise
The cylinder of predetermined threshold, engine controller can reduce its intake air temperature or reduce its distributive value, thus by each cylinder
The rate of pressure rise be held in certain limit value.
Under the thin ignition mode of engine, as homogeneity compression-ignition and the transient working condition of ignition mode, the combustion of engine
Burning state gradually changes because of the change of air themperature.In this mode, equally can be according to 50% heat liberation rate, heat release rate angle of each cylinder
Realize the multi-cylinder balancing work of engine with least one in mean effective pressure, correspondingly can adjust time of ignition and
Distributive value realizes the balance of each cylinder.
On the one hand, according to one embodiment of present invention, state calculating unit can calculate mean effective pressure, and shape
State adjustment unit can make the fired state of each cylinder based on the mean effective pressure by adjusting the distributive value of each cylinder
Balance.In practice, the target mean effective pressure of cylinder needs to be determined according to the demand torque of engine.If
The actual average effective pressure and desired value deviation of current cylinder within the specific limits, mainly can be made respectively by adjusting distributive value
The actual average effective pressure of cylinder is close to or up desired value.If deviation exceedes limit value or engine is in state of catching fire,
Relevant cylinder is then set to enter corresponding fault diagnosis and dealing state.
On the other hand, according to some embodiments of the present invention, state calculating unit can calculate 50% heat liberation rate, heat release rate angle, and
And state adjustment unit can the 50% heat liberation rate, heat release rate angle based on each cylinder by adjusting the ignition advance angle of each cylinder simultaneously
Time of ignition is adjusted with distributive value, so that the fired state balance of each cylinder.The regulation of time of ignition can make each cylinder
Flameholding is also kept under thin ignition mode.
Accurate measurement and control of the invention by increasing cylinder pressure sensor to realize to in-cylinder combustion process.Engine control
Device processed can gather the signal of cylinder pressure sensor, and it is analyzed and calculated, and be followed so as to obtain each cylinder work at present of engine
The fired state information of ring, and the control parameter of each cylinder of subsequent cycle is adjusted according to fired state, each cylinder work is eliminated with this
The lack of uniformity of work, improve the efficiency of combustion and run stability of engine.
Some specific embodiments are enumerated above to elaborate the present invention, this few example is only for the principle of the explanation present invention
And embodiments thereof is used, rather than limitation of the present invention, without departing from the spirit and scope of the present invention, this area
Those of ordinary skill can also make various modifications and improvement.Therefore all equivalent technical schemes all should belong to the present invention's
Category is simultaneously limited by every claim of the invention.
Claims (9)
1. a kind of control method of multicylinder engine, it is characterised in that methods described includes：
The cylinder pressure signal of each cylinder and corresponding engine crankshaft corner signal are gathered in a working cycles；
Signal and the corner signal is pressed to calculate fired state of each cylinder in the working cycles according to the cylinder
Information, the fired state information include 50% heat liberation rate, heat release rate angle of each cylinder；
Determine the median in 50% heat liberation rate, heat release rate angle of each cylinder；And
The fired state information based on each cylinder is directed to the different combustion modes of engine in next working cycles
Ignition advance angle, intake air temperature and/or distributive value by adjusting each cylinder balance the fired state of each cylinder；
Wherein, the combustion mode comprises at least：
Ignition mode；Average compression-ignition mode；And thin ignition mode,
Wherein, adjusting ignition advance angle, intake air temperature and/or the distributive value of each cylinder includes：
It is more than the cylinder of the median for 50% heat liberation rate, heat release rate angle, performs following control any of which item or multinomial：Increase
Its ignition advance angle, improve its intake air temperature and, increase its distributive value；
It is less than the cylinder of the median for 50% heat liberation rate, heat release rate angle, performs following control any of which item or multinomial：Reduce
Its ignition advance angle, reduce its intake air temperature and, reduce its distributive value.
2. the method as described in claim 1, it is characterised in that the fired state information also includes the pressure liter of each cylinder
High rate, and
In the case where engine is in ignition mode, also based on the rate of pressure rise of each cylinder by adjusting each gas
The ignition advance angle of cylinder balances the fired state of each cylinder.
3. method as claimed in claim 2, it is characterised in that adjustment ignition advance angle includes：
By the rate of pressure rise of each cylinder compared with predetermined threshold；And
It is more than the cylinder of predetermined threshold for the rate of pressure rise, reduces its ignition advance angle.
4. the method as described in claim 1, it is characterised in that the fired state information, which also includes being averaged for each cylinder, to be had
Pressure is imitated, and
In the case where engine is in homogeneity compression-ignition pattern or thin ignition mode, the average effective based on each cylinder
Pressure balances the fired state of each cylinder by adjusting the distributive value of each cylinder,
Wherein adjusting the distributive value of each cylinder respectively makes the mean effective pressure of each cylinder close to target mean effective pressure.
5. method as claimed in claim 4, it is characterised in that for mean effective pressure and the target mean effective pressure
Deviation be more than predetermined threshold cylinder, the cylinder is entered corresponding fault diagnosis and dealing state.
6. the method as described in claim 1, it is characterised in that the fired state information also includes the pressure liter of each cylinder
High rate, and
In the case where engine is in compression-ignition mode, also based on the rate of pressure rise of each cylinder by adjusting each gas
The intake air temperature or distributive value of cylinder balance the fired state of each cylinder.
7. method as claimed in claim 6, it is characterised in that based on the rate of pressure rise of each cylinder by adjusting
Stating the intake air temperature of each cylinder or distributive value includes the fired state balance of each cylinder：
By the rate of pressure rise of each cylinder compared with predetermined threshold；And
It is more than the cylinder of predetermined threshold for the rate of pressure rise, reduces its intake air temperature or reduce its distributive value.
8. the method as described in claim 1, it is characterised in that in the case where engine is in thin ignition mode, be based on
50% heat liberation rate, heat release rate angle of each cylinder is by the way that adjusting the ignition advance angle of each cylinder and distributive value makes each cylinder simultaneously
Fired state balances.
9. a kind of multicylinder engine device, it is characterised in that described device includes crankshaft sensor, cylinder corresponding with each cylinder
Pressure sensor and engine controller, wherein
The engine controller includes：
Data acquisition unit, for gathering the cylinder pressure signal of each cylinder simultaneously from the cylinder pressure sensor in a working cycles
And from the crankshaft sensor collection corresponding to engine crankshaft corner signal；
State calculating unit, for pressing signal and the corner signal to calculate each cylinder in the work according to the cylinder
Fired state information in circulating, wherein the fired state information includes 50% heat liberation rate, heat release rate angle of each cylinder, it is described
State calculating unit further determines that the median in 50% heat liberation rate, heat release rate angle of each cylinder；And
State balance unit, in next working cycles the fired state information based on each cylinder for starting
The different combustion modes of machine make each cylinder by adjusting ignition advance angle, intake air temperature and/or the distributive value of each cylinder
Fired state balances；
Wherein, the combustion mode comprises at least：
Ignition mode；Average compression-ignition mode；And thin ignition mode；
Wherein, adjusting ignition advance angle, intake air temperature and/or the distributive value of each cylinder includes：
It is more than the cylinder of the median for 50% heat liberation rate, heat release rate angle, performs following control any of which item or multinomial：Increase
Its ignition advance angle, improve its intake air temperature and, increase its distributive value；
It is less than the cylinder of the median for 50% heat liberation rate, heat release rate angle, performs following control any of which item or multinomial：Reduce
Its ignition advance angle, reduce its intake air temperature and, reduce its distributive value.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6662627B2 (en) * | 2014-12-16 | 2020-03-11 | ジーイー グローバル ソーシング エルエルシーＧＥ Ｇｌｏｂａｌ Ｓｏｕｒｃｉｎｇ ＬＬＣ | Engine cylinder misfire detection system |
| CN104632433B (en) * | 2014-12-26 | 2017-03-08 | 长城汽车股份有限公司 | The method that dual fuel engine balances by cylinder |
| CN106150719B (en) * | 2015-04-28 | 2019-05-31 | 长城汽车股份有限公司 | Control method, system and the vehicle of engine |
| CN105863841B (en) * | 2016-05-23 | 2018-05-08 | 上海海事大学 | A kind of method that corner coding is carried out to instantaneous pressure in engine cylinder |
| CN107917003B (en) * | 2016-10-11 | 2020-04-07 | 联合汽车电子有限公司 | Control method for engine running stability |
| CN108240268B (en) * | 2016-12-27 | 2020-07-14 | 上海汽车集团股份有限公司 | Electronic actuator in vehicle and control method thereof |
| CN110454307B (en) * | 2019-08-28 | 2021-04-23 | 浙江吉利汽车研究院有限公司 | Engine noise reduction method |
| US11572840B2 (en) * | 2019-12-03 | 2023-02-07 | General Electric Company | Multi-mode combustion control for a rotating detonation combustion system |
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