CN207420734U - In-cylinder combustion state estimation system of multi-cylinder engine - Google Patents
In-cylinder combustion state estimation system of multi-cylinder engine Download PDFInfo
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 18
- 238000002474 experimental method Methods 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 abstract description 3
- 238000012937 correction Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 2
- 230000004069 differentiation Effects 0.000 abstract 1
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- 238000010304 firing Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
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Abstract
The in-cylinder combustion state estimation system of the multi-cylinder engine comprises a cylinder pressure sensor, a crankshaft rotating speed sensor and an engine controller, wherein the cylinder pressure sensor is positioned in any cylinder, namely a characteristic cylinder, of the engine, the crankshaft rotating speed sensor is positioned on a crankshaft of the engine, the engine controller comprises a storage module, a data acquisition module, an IMEP (inertial measurement ep) calculation module and a PID (proportion integration differentiation) correction module, the input end of the data acquisition module is in signal connection with the cylinder pressure sensor and the crankshaft rotating speed sensor, and the output ends of the storage module and the data acquisition module are in signal connection with the input end of the PID correction. The design has simple algorithm, is not limited by the number of the cylinders of the engine and has low requirement on the precision of the crank angle.
Description
Technical field
The utility model belongs to automotive engine control technical field, and in particular to a kind of multicylinder engine in-cylinder combustion shape
State estimating system, suitable for the required precision for expanding use scope, simplifying algorithm, reducing crank angle.
Background technology
The in-cylinder pressure of diesel engine directly reflects the working performance of diesel engine, quality, injection timing including intake process
The quality of whether suitable, cylinder the air-tightness of whether accurate, valve clearance, integrated degree of fuel combustion etc..Therefore, measure pressure
Force signal can be detected the working condition of diesel engine.For multicylinder engine, it usually needs one is used per cylinder
Cylinder pressure sensor can so cause cost increase.
Chinese patent：Application publication number is CN104179573A, and data of publication of application is the patent of invention on December 3rd, 2014
It discloses a kind of internal combustion engine and divides cylinder combustion state method of estimation, a cylinder pressure sensor is set in any point of cylinder of internal combustion engine,
One crankshaft rotational speed sensor is set on the bent axle of internal combustion engine, and first solving each point of cylinder according to crankshaft system of IC engine rigid model refers to
Show torque and, then to command torque and decomposed with obtain when ahead firing cylinder gas load command torque, for set
Have cylinder pressure sensor divides cylinder, and gas load command torque during its ignition is directly measured by cylinder pressure sensor, and will measurement
It makes the difference to obtain being provided with dividing for cylinder pressure sensor when the gas load command torque of ahead firing cylinder obtained by value and previous step
Cylinder be under fire when gas load command torque error, with the error correction be not provided with cylinder pressure sensor cylinder be under fire when
Gas load command torque estimate.Although the system can feed back the burning shape of multi-cylinder only with a cylinder pressure sensor
State parameter, but still there are following defects：
1st, when calculating current cylinder working stroke torque, it is desirable that other cylinders are exactly in compression, exhaust, suction stroke, institute
Four cylinder engine is only applicable in this approach；
2nd, entire calculating process is not only high to the required precision of crank angle, but also its algorithm used is complicated, calculation amount
Greatly, real-time operation is more demanding to the operational capability of controller.
The content of the invention
Four cylinder engine is only applicable to the purpose of the utility model is to overcome existing in the prior art, to crank angle precision
It is required that the problem of high, algorithm is complicated, provide a kind of from engine cylinder number limits, low to crank angle required precision, algorithm is simple
Single multicylinder engine in-cylinder combustion condition estimating system.
In order to achieve the above object, the technical solution of the utility model is as follows：
A kind of multicylinder engine in-cylinder combustion condition estimating system, including being located in any cylinder of engine i.e. feature cylinder
Cylinder pressure sensor, the crankshaft rotational speed sensor on engine crankshaft, engine controller；
The engine controller includes memory module, data acquisition module, IMEP computing modules, PID correcting modules, institute
The input terminal for stating data acquisition module is connected with cylinder pressure sensor, crankshaft rotational speed sensor signal, and the memory module, data are adopted
Collect input end signal of the output terminal of module with IMEP computing modules to be connected, output terminal and the PID of IMEP computing modules are corrected
The input end signal connection of module；
The mean indicated pressure (MIP that the memory module is used to store each cylinder that the experiment of off-line state lower stage measures refers to
The equivalent relation of IMEP and rotating speed index Δ N is marked, the IMEP computing modules are used to according to the cylinder of acquisition signal be pressed to calculate feature
The IMEP of cylinder, the Δ N that non-feature cylinder is calculated according to the speed of crankshaft signal of acquisition, and pass through the equivalent relation in memory module and obtain
Go out the IMEP of non-feature cylinder, the PID correcting modules are used for using the IMEP of feature cylinder as desired value, using pid algorithm to non-spy
The IMEP of sign cylinder is modified, and the IMEP for making each cylinder is consistent.
The rotating speed index Δ N refers to rise in fixed crankshaft corner, stop bit puts the certain angle scope being calculated respectively
The difference of interior mean speed.
The certain angle scope is 6 °~90 °.
Compared with prior art, the beneficial effects of the utility model are：
1st, engine controller includes storage in a kind of multicylinder engine in-cylinder combustion condition estimating system of the utility model
Module, data acquisition module, IMEP computing modules, PID correcting modules, the input terminal and cylinder pressure sensor of data acquisition module,
Crankshaft rotational speed sensor signal connects, the input terminal of memory module, the output terminal of data acquisition module with IMEP computing modules
Signal connects, and the output terminal of IMEP computing modules is connected with the input end signal of PID correcting modules, which is built offline using first
The equivalent relation of each cylinder I MEP and Δ N is found, then measures the IMEP of feature cylinder under presence using a cylinder pressure sensor,
The Δ N of non-feature cylinder is measured using crankshaft rotational speed sensor, and the IMEP of non-feature cylinder is obtained according to equivalent relation, then with feature
The IMEP of cylinder is desired value, and the IMEP of non-feature cylinder is modified with reference to pid algorithm, so using a cylinder pressure sensing
Device is the IMEP values that can obtain all cylinders, and not only calculation amount is small, is suitble to application on site, and from the limit of engine cylinder number
System, can apply in four cylinders, six cylinder engine.Therefore, the utility model not only calculates simply, but also from engine cylinder number
Limitation.
2nd, rotating speed index Δ N refers in fixation in a kind of multicylinder engine in-cylinder combustion condition estimating system of the utility model
Crank angle, stop bit put the difference of the mean speed in the range of the certain angle being calculated respectively, using the index as weighing apparatus
The standard of current cylinder acting is measured, it is not only scientific and reasonable, and also the calculating of the index is relatively low to the required precision of crank angle.Cause
This, the utility model is low to crank angle required precision.
Description of the drawings
Fig. 1 is the structure diagram of Tthe utility model system.
Fig. 2 is the schematic diagram of rotating speed index in the utility model.
Fig. 3 is the structure chart of pid algorithm in the utility model.
In figure：Cylinder pressure sensor 1, crankshaft rotational speed sensor 2, engine controller 3, memory module 31, data acquisition module
Block 32, IMEP computing modules 33, PID correcting modules 34.
Specific embodiment
The utility model is described in further detail With reference to embodiment.
Referring to Fig. 1, a kind of multicylinder engine in-cylinder combustion condition estimating system is i.e. special including being located at any cylinder of engine
Levy the cylinder pressure sensor 1 in cylinder, the crankshaft rotational speed sensor 2 on engine crankshaft, engine controller 3；
The engine controller 3 includes memory module 31, data acquisition module 32, IMEP computing modules 33, PID and corrects
Module 34, the input terminal of the data acquisition module 32 is connected with cylinder pressure sensor 1,2 signal of crankshaft rotational speed sensor, described to deposit
It stores up the input end signal of module 31, the output terminal of data acquisition module 32 with IMEP computing modules 33 to be connected, IMEP calculates mould
The output terminal of block 33 is connected with the input end signal of PID correcting modules 34；
The memory module 31 is used to store the mean indicated pressure (MIP for each cylinder that the experiment of off-line state lower stage measures
The equivalent relation of index IMEP and rotating speed index Δ N, the IMEP computing modules 33 are used to according to the cylinder of acquisition signal be pressed to calculate
The IMEP of feature cylinder, the Δ N that non-feature cylinder is calculated according to the speed of crankshaft signal of acquisition, and pass through equivalent in memory module 31
Relation draws the IMEP of non-feature cylinder, and the PID correcting modules 34 are used for using the IMEP of feature cylinder as desired value, are calculated using PID
Method is modified the IMEP of non-feature cylinder, and the IMEP for making each cylinder is consistent.
The rotating speed index Δ N refers to rise in fixed crankshaft corner, stop bit puts the certain angle scope being calculated respectively
The difference of interior mean speed.
The certain angle scope is 6 °~90 °.
The principle of the utility model is described as follows：
Rotating speed index Δ N：The utility model is based on crankshaft rotational speed sensor 2, is calculated in fixed crankshaft corner start-stop position
The mean speed of certain angle scope, each cylinder corresponds to two such mean speeds, with difference, that is, rotating speed of two rotating speeds
Index is as the index for weighing current cylinder acting.
Embodiment 1：
Referring to Fig. 1, a kind of estimating system of multicylinder engine in-cylinder combustion state, including being located at any cylinder of engine i.e.
Cylinder pressure sensor 1 in feature cylinder, the crankshaft rotational speed sensor 2 on engine crankshaft, engine controller 3, the hair
Motivation controller 3 includes memory module 31, data acquisition module 32, IMEP computing modules 33, PID correcting modules 34, the number
It is connected according to the input terminal of acquisition module 32 with cylinder pressure sensor 1,2 signal of crankshaft rotational speed sensor, the memory module 31, data
Input end signal of the output terminal of acquisition module 32 with IMEP computing modules 33 is connected, the output terminal of IMEP computing modules 33 with
The input end signal connection of PID correcting modules 34, and the memory module 31 measures for storing the experiment of off-line state lower stage
Each cylinder mean indicated pressure (MIP index IMEP and rotating speed index Δ N equivalent relation, the IMEP computing modules 33 use
According to the cylinder of acquisition signal being pressed to calculate the IMEP of feature cylinder, the Δ N of non-feature cylinder is calculated according to the speed of crankshaft signal of acquisition,
And the equivalent relation passed through in memory module 31 draws the IMEP of non-feature cylinder, the PID correcting modules 34 are used for feature cylinder
IMEP for desired value, the IMEP of non-feature cylinder is modified using pid algorithm, the IMEP for making each cylinder is consistent, wherein,
The rotating speed index Δ N refers to the difference that the mean speed in 30 ° be calculated respectively is put in fixed crankshaft corner, stop bit
Value.
The application method of above system uses following steps successively：
First, under off-line state, first a cylinder pressure sensor is set in each cylinder of engine, and in the bent axle of engine
Upper to set a crankshaft rotational speed sensor, then each cylinder is calculated according to the cylinder pressure signal received in engine controller 3
Mean indicated pressure (MIP index IMEP, calculate according to the speed of crankshaft signal of reception the rotating speed index Δ N of each cylinder, and use
MAP establishes the equivalent relation of IMEP and Δ N, wherein, the rotating speed index Δ N refers to rise in fixed crankshaft corner, stop bit is put point
The difference for the mean speed in 30 ° not being calculated (referring to Fig. 2)：
IIMEPj=f (Δ Nj) (j=L2,3,4,5,6)
ΔNj=NjH-NjL(j=1,2,3,4,5,6)
In formula ,+180 DEG C of A of acting top dead centre are 180 ° of crank angles after acting top dead centre, and acting -180 DEG C of A of top dead centre are
Do work top dead centre before 180 ° of crank angles, P be cylinder in-cylinder pressure, v be cylinder volume, VsFor the swept volume of cylinder,
IMEPjFor the mean indicated pressure (MIP index of j-th of cylinder, Δ NjFor the rotating speed index of j-th of cylinder, NjHFor j-th of cylinder institute
The mean speed of corresponding high regime, NjLFor the mean speed of the low speed segment corresponding to j-th of cylinder；
2nd, first select any cylinder of engine that cylinder pressure sensor 1 is set inside it as feature cylinder, and in engine
Bent axle on set crankshaft rotational speed sensor 2, then under presence, engine controller 3 according to the cylinder of reception press signal meter
It calculates the IMEP of feature cylinder, the Δ N of non-feature cylinder, and the non-spy obtained according to step 1 is calculated according to the speed of crankshaft signal of reception
The equivalent relation of sign cylinder IMEP and Δ N draws the IMEP of non-feature cylinder；
3rd, referring to Fig. 3, using the IMEP of feature cylinder as desired value, the IMEP of non-feature cylinder is repaiied using pid algorithm
Just, the IMEP for making each cylinder is consistent.
Claims (3)
1. a kind of multicylinder engine in-cylinder combustion condition estimating system, including being located at the cylinder in any cylinder of engine i.e. feature cylinder
Pressure sensor (1), the crankshaft rotational speed sensor (2) on engine crankshaft, engine controller (3), it is characterised in that：
The engine controller (3) includes memory module (31), data acquisition module (32), IMEP computing modules (33), PID
Correcting module (34), input terminal and cylinder pressure sensor (1), the crankshaft rotational speed sensor (2) of the data acquisition module (32) are believed
Number connection, the input terminal of the memory module (31), the output terminal of data acquisition module (32) with IMEP computing modules (33)
Signal connects, and the output terminal of IMEP computing modules (33) is connected with the input end signal of PID correcting modules (34)；
The mean indicated pressure (MIP that the memory module (31) is used to store each cylinder that the experiment of off-line state lower stage measures refers to
The equivalent relation of IMEP and rotating speed index Δ N is marked, the IMEP computing modules (33) are used to according to the cylinder of acquisition signal be pressed to calculate
The IMEP of feature cylinder, the Δ N that non-feature cylinder is calculated according to the speed of crankshaft signal of acquisition, and pass through in memory module (31) etc.
Effect relation draws the IMEP of non-feature cylinder, and the PID correcting modules (34) are used for using the IMEP of feature cylinder as desired value, are used
Pid algorithm is modified the IMEP of non-feature cylinder, and the IMEP for making each cylinder is consistent.
2. a kind of multicylinder engine in-cylinder combustion condition estimating system according to claim 1, it is characterised in that：Described turn
Fast index Δ N refers to put the mean speed in the range of the certain angle being calculated respectively in fixed crankshaft corner, stop bit
Difference.
3. a kind of multicylinder engine in-cylinder combustion condition estimating system according to claim 2, it is characterised in that：Described one
Angular range is determined for 6 °~90 °.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107701320A (en) * | 2017-09-30 | 2018-02-16 | 东风商用车有限公司 | Method and system for estimating combustion state in cylinder of multi-cylinder engine |
| CN113202644A (en) * | 2021-06-04 | 2021-08-03 | 潍柴动力股份有限公司 | Control system for improving working stability of natural gas engine |
-
2017
- 2017-09-30 CN CN201721280144.2U patent/CN207420734U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107701320A (en) * | 2017-09-30 | 2018-02-16 | 东风商用车有限公司 | Method and system for estimating combustion state in cylinder of multi-cylinder engine |
| CN113202644A (en) * | 2021-06-04 | 2021-08-03 | 潍柴动力股份有限公司 | Control system for improving working stability of natural gas engine |
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