CN208252214U - A kind of EGR double closed-loop control system - Google Patents
A kind of EGR double closed-loop control system Download PDFInfo
- Publication number
- CN208252214U CN208252214U CN201820554173.1U CN201820554173U CN208252214U CN 208252214 U CN208252214 U CN 208252214U CN 201820554173 U CN201820554173 U CN 201820554173U CN 208252214 U CN208252214 U CN 208252214U
- Authority
- CN
- China
- Prior art keywords
- egr
- engine
- intercooler
- turbine
- manifold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The utility model relates to a kind of EGR double closed-loop control systems, including engine, voltage-stablizer, cooler for recycled exhaust gas, turbine, compressor, EGR valve, exhaust manifold, intercooler, engine, inlet manifold and ECU；Speed probe is provided on camshaft, crankshaft is equipped with torque sensor, oxygen sensor is set in exhaust manifold, pressure sensor is set in inlet manifold, discharge manifold is connected with turbine air inlet, turbine gas outlet is connected with EGR valve, and cooler for recycled exhaust gas is connected with the EGR valve, and cooler is connected with inlet manifold；Compressor is connected with intercooler, and voltage-stablizer is provided on the pipeline between compressor and intercooler, and intercooler is connected with inlet manifold, and inlet manifold is connected with the cylinder of engine, and the shaft of turbine is fixedly connected with the shaft of compressor.Smoke intensity caused by effectively inhibiting because of EGR overshoot deteriorates, and thoroughly solves EGR overshoot in engine typical case transient state loading procedure.
Description
Technical field
The utility model relates to engine exhaust control technology fields, and in particular to a kind of EGR double closed-loop control system and
Its control method.
Background technique
With the increase of China's car ownership, environmental problem caused by vehicle exhaust noxious emission is also got worse.
It is influenced by large diesel engine state V emission regulation and the following more harsh emission regulation, diesel engine future solves emission problem
Key will no longer be limited only to in-cylinder combustion and optimize integration the technology path of preprocessor device.To reduce expensive preprocessor
Portion, further decrease exhaust emissions amount, introduce EGR technology and certainly will become and reaches following 6 discharge standard of the state requirement
Primary selection.Since 4 emission regulation of diesel engine state is implemented, require to large diesel engine transient-cycle in point state test Particulate Emission
It limits, since diesel engine for automobile transient condition characteristic deviates its steady state condition, exhaust emissions nuisance and noise emission are equal
Higher than steady state condition discharge, obviously deteriorating also occurs in fuel economy, and especially shows in supercharged diesel engine load on process
It is more obvious, the reduction that egr system will then aggravate air inflow is introduced, but resulting EGR overshoot problem will further result in
The deterioration of diesel emission and fuel economy.
Summary of the invention
One purpose of the utility model is to provide a kind of EGR double closed-loop control system, controls precision by improving EGR valve
And responsiveness, and apply to diesel engine typical case's transient state loading procedure, the smoke intensity severe exacerbation caused by inhibiting because of EGR overshoot.
The purpose of this utility model is achieved through the following technical solutions:
A kind of EGR double closed-loop control system, including engine 12, voltage-stablizer 7, cooler for recycled exhaust gas 9, turbine 5, compressor
6, EGR valve 10, exhaust manifold 11, intercooler 8, engine 12, inlet manifold 13 and ECU 14；The camshaft of the engine
On be provided with speed probe 1, the crankshaft of engine is equipped with torque sensor 2, and oxygen sensor is arranged in exhaust manifold 11
3, pressure sensor 4, the speed probe 1, torque sensor 2, lambda sensor 3 and pressure sensing are set in inlet manifold 13
Device 4 and ECU14 control connect, and the discharge manifold 11 is connected with 5 air inlet of turbine, 5 gas outlet of turbine and EGR valve
10 are connected, and cooler for recycled exhaust gas 9 is connected with the EGR valve 10, and EGR cooler 9 is connected with inlet manifold 13；The pressure
Mechanism of qi 6 is connected with intercooler 8, and voltage-stablizer 7, intercooler 8 and air inlet are provided on the pipeline between compressor 6 and intercooler 8
Manifold 13 is connected, and inlet manifold 13 is connected with the cylinder of engine 12, and the shaft of turbine 5 and the shaft of compressor 6 are solid
Fixed connection.
Another purpose of the utility model is to provide a kind of EGR double-closed-loop control method, and its step are as follows:
1) the primary motivation progress exemplary diesel engine load test that no egr system is introduced, acquirement density of oxygen contained in discharged gas, NOx,
Admission pressure, the test data of particle emission, and all data are used for ECU inquiry；
2) signal that its operating condition changes is transmitted to ECU14 according to speed probe 1 and torque sensor 2, ECU14 is according to biography
The signal passed judges the operating status of engine 12, and target exhaust oxygen concentration is arranged, and target inlet air pressure is arranged, described
Target exhaust oxygen concentration is engine typical case's transient state loading procedure density of oxygen contained in discharged gas under the former introducing without egr system, target inlet air
Pressure is engine typical case's transient state loading procedure admission pressure under the former introducing without egr system；
3) ECU obtains current density of oxygen contained in discharged gas, current admission pressure, and judges current density of oxygen contained in discharged gas deviation ratio；
4) original machine is increased into A% and as the new target that follows without the density of oxygen contained in discharged gas of EGR transient process, if current exhaust
Oxygen concentration numerical value and target follow the difference of oxygen concentration numerical value to be less than A%, and target exhaust oxygen concentration is constant；
If 5) deviation ratio of density of oxygen contained in discharged gas is lower than X%, the concussion effect of density of oxygen contained in discharged gas is ignored, and passes through PID
EGR valve aperture is adjusted in moment, and current density of oxygen contained in discharged gas is promoted infinitely to approach with target；
6) if the deviation ratio of density of oxygen contained in discharged gas is higher than X%, density of oxygen contained in discharged gas concussion is serious, is carried out using density of oxygen contained in discharged gas
PID adjusting can not reach purpose, stop using the feedback control of density of oxygen contained in discharged gas；
If 7) deviation ratio of density of oxygen contained in discharged gas is higher than X%, feedback control is carried out using admission pressure deviation at this time, is taken
The PID moment corrects EGR valve valve opening mode, and current admission pressure is promoted infinitely to approach with target inlet air pressure；Control method
It is identical with by feedback parameter of density of oxygen contained in discharged gas；
8) ECU obtains current density of oxygen contained in discharged gas, current air inlet pressure force value again, and judges that current density of oxygen contained in discharged gas is inclined
Rate；
If 9) deviation ratio of density of oxygen contained in discharged gas is lower than X%, using the feedback control of density of oxygen contained in discharged gas, it is anti-to deactivate admission pressure
Feedback control；
10) return step 4).
The A is 5, and the X is 5.
The beneficial effects of the utility model are as follows:
The utility model takes high tension loop mounting means, since admission pressure is not much different before and after intercooler, and in order to
Shorten boost pressure signal response time, removal circulation air inlet bring signal fluctuation, in supercharged diesel engine blower outlet position
It sets and adds pressure stabilizing case apparatus, the admission pressure after pressure stabilizing is presented in engine typical case's loading procedure stablizes monotone decreasing variation,
It thus takes moment PID to correct EGR valve valve opening mode, promotes the air inlet of current admission pressure Yu original machine transition loading procedure
Pressure is infinitely approached, and the oscillation characteristics of moment monitoring density of oxygen contained in discharged gas, when in negligible oscillating condition, still with exhaust
Oxygen concentration feedback system, the final purpose realizing EGR valve high-precision, high response closed loop and accurately controlling, effectively inhibits because of EGR overshoot
Caused smoke intensity deterioration problem thoroughly solves the problems, such as EGR overshoot in engine typical case's transient state loading procedure.
Detailed description of the invention
Fig. 1 is that the utility model two-stage supercharging diesel engine realizes the accurate control structure simplified schematic diagram of EGR；
Fig. 2 is the flow chart that the utility model two-stage supercharging diesel engine realizes that EGR is accurately controlled.
Specific embodiment
The utility model is described in more detail with reference to the accompanying drawings and examples.
As shown in Fig. 2, the utility model provides a kind of EGR double closed-loop control system, including engine 12, voltage-stablizer 7,
EGR cooler 9, turbine 5, compressor 6, EGR valve 10, exhaust manifold 11, intercooler 8, engine 12,13 and of inlet manifold
ECU 14；Speed probe 1 is provided on the camshaft of the engine, the crankshaft of engine is equipped with torque sensor 2,
Oxygen sensor 3 is set in exhaust manifold 11, sets pressure sensor 4, the speed probe 1, torque in inlet manifold 13
Sensor 2, lambda sensor 3 and pressure sensor 4 and ECU14 control connect, the discharge manifold 11 and 5 air inlet of turbine
Mouth is connected, and 5 gas outlet of turbine is connected with EGR valve 10, and cooler for recycled exhaust gas 9 is connected with the EGR valve 10, and EGR is cooling
Device 9 is connected with inlet manifold 13；The compressor 6 is connected with intercooler 8, the pipeline between compressor 6 and intercooler 8
On be provided with voltage-stablizer 7, intercooler 8 is connected with inlet manifold 13, and inlet manifold 13 is connected with the cylinder of engine 12, whirlpool
The shaft of turbine 5 is fixedly connected with the shaft of compressor 6, after exhaust gas enters turbine 5, is pushed turbine blade rotation, is calmed the anger
The blade of machine 6 and turbine blade are coaxial, therefore under the drive of turbine, and compressor blade rotation is drawn air into.
The utility model based on original without egr system introduce lower engine typical case's transient state loading procedure density of oxygen contained in discharged gas for
With target, compared with introducing the transient process density of oxygen contained in discharged gas after egr system and synchronizing, moment PID corrects EGR valve valve
Aperture promotes the two density of oxygen contained in discharged gas infinitely to approach, it is intended to the smoke intensity deterioration problem caused by effectively inhibiting because of EGR overshoot.Due to
Density of oxygen contained in discharged gas, there are objective delay feature, is sentenced from density of oxygen contained in discharged gas parameter in addition compared to engine in-cylinder combustion characteristic parameter
Determine and feed back to after EGR valve executes PID control, burns to engine fuel to sentence again into the reading of exhaust pipe final vacuum oxygen concentration
It is fixed, a small number of combustion cycle process need to be undergone, density of oxygen contained in discharged gas follows consistent degree limited, thus once there is its numerical value and deviate
(density of oxygen contained in discharged gas numerical value is read and target follows the difference of oxygen concentration numerical value) spy when more than 1% for original machine without EGR transient process
Density of oxygen contained in discharged gas increases respective value and follows target as new, promotes engine smoke emission and original machine special without EGR transient state
Property infinitely approach, thoroughly solve the problems, such as EGR overshoot in engine typical case's transient state loading procedure.Further, since oxygen concentration sensor
It recycles the high response characteristic of grade and is easy to cause signal fluctuation, and aggravation EGR valve valve control unstability is so that there are engine combustions
It burns and deteriorates possibility, define the judgment basis (deviation ratio: the density of oxygen contained in discharged gas that current time reads that density of oxygen contained in discharged gas obviously vibrates
And the difference of the moving average of its preceding 4-8 phase reading value, then be that oscillation is ignored lower than 5% numerical value the ratio between with the moving average
Disregard).When be determined to have density of oxygen contained in discharged gas oscillation it is serious when, due to booster postpone response characteristic, previous cycle air inlet item
Part is not influenced still by density of oxygen contained in discharged gas oscillation, and the admission pressure after pressure stabilizing presents in engine typical case's loading procedure and stablizes list
Tune successively decreases variation, thus moment PID is taken to correct EGR valve valve opening mode, and current admission pressure is promoted to add with original machine transition
The admission pressure of load process infinitely approaches, and the oscillation characteristics of moment monitoring density of oxygen contained in discharged gas, once in negligible oscillation item
When part, still with density of oxygen contained in discharged gas feedback system, the final purpose realizing EGR valve high-precision, high response closed loop and accurately controlling.
Embodiment 1
1) the primary motivation introduced to no egr system carries out exemplary diesel engine load test, obtain density of oxygen contained in discharged gas, Nox,
The test data of admission pressure, particle emission, and all data are used for ECU inquiry.
2) signal that its operating condition changes is transmitted to Engine ECU according to speed probe and torque sensor, ECU is according to biography
The signal passed judges the operating status of engine, and target exhaust oxygen concentration is arranged, and target inlet air pressure is arranged.(target row
Gas oxygen concentration is engine typical case's transient state loading procedure density of oxygen contained in discharged gas under the former introducing without egr system, and target inlet air pressure is
Original is without engine typical case's transient state loading procedure admission pressure under egr system introducing)
3) ECU obtains current density of oxygen contained in discharged gas, current admission pressure, and judges current density of oxygen contained in discharged gas deviation ratio.
4) if current exhaust oxygen concentration numerical value and target follow the difference of oxygen concentration numerical value to be greater than 1%, by original machine without EGR transition
The density of oxygen contained in discharged gas of process increases by 1% and follows target as new.If current exhaust oxygen concentration numerical value follows oxygen dense with target
For the difference of degree value less than 1%, target exhaust oxygen concentration is constant.
5) if the deviation ratio of density of oxygen contained in discharged gas is lower than 5%, the concussion effect of density of oxygen contained in discharged gas is ignored, and PID is passed through
EGR valve aperture is adjusted in moment, and current density of oxygen contained in discharged gas is promoted infinitely to approach with target.
6) if the deviation ratio of density of oxygen contained in discharged gas is higher than 5%, density of oxygen contained in discharged gas concussion is serious, is carried out using density of oxygen contained in discharged gas
PID adjusting can not reach purpose, stop using the feedback control of density of oxygen contained in discharged gas.
If 7) deviation ratio of density of oxygen contained in discharged gas is higher than 5%, feedback control is carried out using admission pressure deviation at this time, is taken
The PID moment corrects EGR valve valve opening mode, and current admission pressure is promoted infinitely to approach with target inlet air pressure.Control method
It is identical with by feedback parameter of density of oxygen contained in discharged gas.
8) ECU obtains current density of oxygen contained in discharged gas, current air inlet pressure force value again, and judges that current density of oxygen contained in discharged gas is inclined
Rate.
If 9) deviation ratio of density of oxygen contained in discharged gas is lower than 5%, using the feedback control of density of oxygen contained in discharged gas, it is anti-to deactivate admission pressure
Feedback control.
10) return step 4).
In summary: the utility model solves the problems, such as transient condition EGR overshoot, based on the pressurization for being configured with egr system
Diesel engine makes particle emission can satisfy national standard, devises EGR double closed-loop control system under transient condition, is suitable for diesel oil
Machine transient state EGR control.
Claims (1)
1. a kind of EGR double closed-loop control system, it is characterised in that: including engine (12), voltage-stablizer (7), cooler for recycled exhaust gas (9),
Turbine (5), compressor (6), EGR valve (10), exhaust manifold (11), intercooler (8), engine (12), inlet manifold (13)
With ECU (14)；It is provided in the engine upper camshaft speed probe (1), the crankshaft of engine is passed equipped with torque
Sensor (2), exhaust manifold (11) is interior to be arranged oxygen sensor (3), sets pressure sensor (4) in inlet manifold (13), described
Speed probe (1), torque sensor (2), lambda sensor (3) and pressure sensor (4) and ECU (14) control connect, described
Exhaust manifold (11) be connected with turbine (5) air inlet, turbine (5) gas outlet is connected with EGR valve (10), and EGR is cold
But device (9) is connected with the EGR valve (10), and cooler for recycled exhaust gas (9) is connected with inlet manifold (13)；The compressor (6)
Be connected with intercooler (8), be provided on the pipeline between compressor (6) and intercooler (8) voltage-stablizer (7), intercooler (8) with
Inlet manifold (13) is connected, and inlet manifold (13) is connected with the cylinder of engine (12), the shaft of turbine (5) with calm the anger
The shaft of machine (6) is fixedly connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820554173.1U CN208252214U (en) | 2018-04-18 | 2018-04-18 | A kind of EGR double closed-loop control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820554173.1U CN208252214U (en) | 2018-04-18 | 2018-04-18 | A kind of EGR double closed-loop control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208252214U true CN208252214U (en) | 2018-12-18 |
Family
ID=64637748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820554173.1U Expired - Fee Related CN208252214U (en) | 2018-04-18 | 2018-04-18 | A kind of EGR double closed-loop control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208252214U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108506105A (en) * | 2018-04-18 | 2018-09-07 | 吉林大学 | A kind of EGR double closed-loop control systems and its control method |
-
2018
- 2018-04-18 CN CN201820554173.1U patent/CN208252214U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108506105A (en) * | 2018-04-18 | 2018-09-07 | 吉林大学 | A kind of EGR double closed-loop control systems and its control method |
| CN108506105B (en) * | 2018-04-18 | 2023-06-30 | 吉林大学 | EGR double closed-loop control system and control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6973785B2 (en) | Apparatus and method for controlling EGR in an engine | |
| US6868329B2 (en) | Control method of EGR system of engine | |
| US7150264B2 (en) | Control device for internal combustion engine | |
| CN101289965B (en) | Waste gas recirculation estimation system | |
| US8640457B2 (en) | System and method for operating a turbocharged engine | |
| US8820297B2 (en) | Control device for internal combustion engine | |
| CN101818693B (en) | Throttle control systems and methods for internal combustion engines to reduce throttle oscillations | |
| US9267430B2 (en) | Engine controlling emissions during transient operations | |
| JP2008175139A (en) | Exhaust gas recirculation system of internal combustion engine | |
| US7447587B2 (en) | Cylinder to cylinder variation control | |
| US8170776B2 (en) | Method and device for controlling an internal combustion engine | |
| US20180283295A1 (en) | Engine out nox controller | |
| US7769526B2 (en) | Diesel transient combustion control based on intake carbon dioxide concentration | |
| CN208252214U (en) | A kind of EGR double closed-loop control system | |
| US20100229536A1 (en) | Exhaust gas purification system for internal combustion engine | |
| US9926839B2 (en) | Internal combustion engine and method for controlling internal combustion engine | |
| JP4561816B2 (en) | Abnormality determination device and abnormality determination method for internal combustion engine | |
| JP2002155783A (en) | Fuel injection control device of diesel engine | |
| JP2008223710A (en) | Exhaust recirculation device of internal combustion engine | |
| Chen et al. | Research on Effect of Wastegate Diameter on Turbocharged Gasoline Engine Perfor Mance | |
| CN108506105A (en) | A kind of EGR double closed-loop control systems and its control method | |
| CN110873000A (en) | Control device and control method for internal combustion engine | |
| US20210003083A1 (en) | Dynamic control of an air handling system for vehicle acceleration performance | |
| JP6520369B2 (en) | Method and apparatus for controlling EGR gas amount of a vehicle equipped with VGT turbo | |
| JPH07293349A (en) | Exhaust reflux control device for internal combustion engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181218 Termination date: 20210418 |