CN112302815B - Method for controlling exhaust temperature of electronic control diesel engine based on thermal proportion - Google Patents
Method for controlling exhaust temperature of electronic control diesel engine based on thermal proportion Download PDFInfo
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- CN112302815B CN112302815B CN202011194858.8A CN202011194858A CN112302815B CN 112302815 B CN112302815 B CN 112302815B CN 202011194858 A CN202011194858 A CN 202011194858A CN 112302815 B CN112302815 B CN 112302815B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a method for controlling the exhaust temperature of an electronic control diesel engine based on a thermal proportion. The method realizes the accurate control of the exhaust temperature under all working conditions by limiting the fuel injection quantity of the engine. The method mainly comprises the following steps: 1. reading the operation parameters of the engine controller in the current period; 2. filtering the exhaust temperature; 3. calculating an exhaust temperature dynamic operation upper limit threshold; 4. calculating a thermal proportional temperature; 5. calculating an exhaust temperature fuel injection quantity threshold; 6. calculating the limit value of the oil injection quantity of each stroke of the exhaust temperature; 7. calculating the limit value of the exhaust temperature oil quantity of the engine; 8. calculating the final output fuel injection quantity of the engine; 9. the exhaust temperature is controlled by the final engine fueling amount.
Description
Technical Field
The invention belongs to the field of power control of an electronic control diesel engine, and particularly relates to a method for controlling the exhaust temperature of the electronic control diesel engine based on a thermal proportion.
Background
As electronically controlled diesel engines have evolved, turbochargers and scr (selective Catalytic reduction) systems are commonly employed by electronically controlled diesel engines to improve engine dynamics, economy, and emissions. But the problem is that the engine damage caused by overhigh exhaust temperature is easy to cause, and particularly the damage to a supercharger and an exhaust manifold is easy to cause; meanwhile, the SCR system has strict requirements on the exhaust temperature, and the exhaust temperature needs to be limited within an acceptable and reasonable range so as to avoid the damage of an SCR catalyst and air pollution caused by direct discharge of untreated tail gas emissions.
At present, the maximum fuel injection quantity is adopted to limit the exhaust temperature, so that the protection of partial working condition points is realized, but because the engine works in a dynamic working process, the accurate control of the exhaust temperature of the engine is difficult to realize in the existing mode under the full working condition of the engine, and the engine is easy to damage.
Disclosure of Invention
The invention provides a method for controlling the exhaust temperature of an electric control diesel engine based on a thermal proportion, and aims to solve the problems that the exhaust temperature of the engine is not accurately controlled and the engine is easily damaged under the whole working condition in the existing mode of controlling the exhaust temperature by adopting the maximum fuel injection quantity.
The specific technical scheme of the invention is as follows:
the invention provides a method for controlling the exhaust temperature of an electronic control diesel engine based on thermal proportion, which comprises the following concrete implementation steps:
reading operation parameters of an engine controller in a current period;
the operation parameters of the engine controller in the current period comprise an air inlet temperature CT, an air inlet flow CF and an air outlet temperature EG k Intake pressure PRESS, engine speed N Eng Fuel injection advance angle FSS _ SOI and expected fuel injection quantity FL cmd ；
Step two, filtering treatment of exhaust temperature;
performing first-order inertial filtering on the read exhaust temperature to obtain an engine exhaust temperature filtering value;
step three, calculating the dynamic operation upper limit threshold value of the exhaust temperature
Calculating an exhaust temperature dynamic operation upper limit threshold EM according to the engine exhaust high temperature limit value, the current period engine exhaust temperature filter value obtained in the step two and the air inlet temperature TU ；
Step four, calculating a thermal proportion temperature EF;
the heat proportional temperature EF consists of four parts, and the calculation step formula is as follows:
EF＝C_offset+C_SOI*FSS_SOI+C_BOOST*PRESS+C_SPEED*N Eng wherein C _ offset is the thermal proportional temperatureThe compensation value has the value range as follows: (500-600) DEG C;
c _ SOI is an oil injection advance angle factor, and the value range is as follows: -200 to-100 ℃/deg.;
FSS _ SOI is the fuel injection advance angle of the current period;
c _ BOOST is the value range of the intake pressure factor: (10-20) DEG C/kPa;
PRESS is the intake pressure of the current cycle;
c _ SPEED is a product factor of the engine SPEED, and the value range is as follows: (2-3) DEG C/rpm;
N Eng the engine speed of the current cycle;
step five, calculating an exhaust temperature fuel injection quantity threshold value FL Lim The calculation formula is as follows:
wherein EF is the thermal proportional temperature; CF is the intake flow of the current period;
sixthly, calculating the limit value FL of the fuel injection quantity per stroke of the exhaust temperature stroke ；
The limit value of the oil injection quantity of each stroke of the exhaust temperature is calculated according to the threshold value of the oil injection quantity of the exhaust temperature, the rotating speed of an engine and the number of cylinders of an internal combustion engine, and the specific calculation formula is as follows:
wherein N is Eng Is the engine speed; cy (Cy) Eng The number of cylinders of the internal combustion engine;
step seven, calculating the limit value of the exhaust oil temperature of the engine;
carrying out amplitude limiting processing through the upper limit value of the exhaust temperature oil quantity of the engine, the lower limit value of the exhaust temperature oil quantity and the oil injection quantity limit value of each stroke of the exhaust temperature to obtain the exhaust temperature oil quantity limit value FL of the engine final ；
Step eight, calculating the final output fuel injection quantity of the engine;
will be whenThe expected fuel injection quantity in the previous period is limited by the limit value of the exhaust temperature fuel quantity of the engine to obtain the final output fuel injection quantity FL of the engine total ；
And step nine, controlling the exhaust temperature through the final fuel injection amount of the engine.
Further, the calculation formula of the engine exhaust temperature filter value in the second step is as follows:
EG＝(EG k -EG k-1 )·C f +EG k
wherein EG represents a current period exhaust temperature filtering value; EG k Representing the initial value of the exhaust temperature in the current period; EG k-1 Representing a filtered value of exhaust temperature of a previous period; c f And selecting the inertial coefficient according to the proportion relation between the current period and the previous period, wherein the value range is 0-1.
Further, the formula for calculating the dynamic operation upper limit threshold of the exhaust temperature in the third step is as follows: EM TU ＝((C_TH U -EG)·C_T G +C_TH U )-CT
Wherein, C _ TH U Representing the high-temperature limit value of the engine exhaust, and calibrating according to the model of the engine; c _ T G And the gain factor is an exhaust temperature gain factor and is calibrated according to the model of the engine.
Furthermore, the high temperature limit value C _ TH of the engine exhaust in the third step U The value range of (2) is (600-900) DEG C; exhaust temperature gain factor C _ T G The value range of (a) is 0 to 1.
Furthermore, the limit value FL of the exhaust temperature oil quantity of the engine in the seventh step final The calculation formula of (2) is as follows: FL final ＝MAX{MIN(FL stroke ，C_FL ULim )，C_FL LLim }；
Wherein FL final The limit value of the exhaust temperature oil quantity of the engine is set; c _ FL ULim The upper limit value of the temperature oil discharge amount is set; the value is calibrated according to the model of the engine, and the value range is (400-500) mg/stroke; c _ FL lLim The temperature-exhaust oil quantity lower limit value is realized according to the calibration of the engine model, and the value range is (200-300) mg/stroke;
further, the final calculation formula of the output fuel injection quantity of the engine in the step eight is as follows:
FL total ＝MIN(FL final ，FL cmd )
wherein FL cmd The desired engine fueling for the current cycle.
The invention has the beneficial effects that:
the method of the invention introduces the operation parameters of the engine such as air inlet temperature, air inlet flow, exhaust temperature, air inlet pressure, engine speed, fuel injection advance angle, expected fuel injection quantity and the like, and accurately calculates the fuel injection quantity output by the engine in each period by adopting a program algorithm input on an engine controller to realize the accurate control of the engine exhaust temperature.
Drawings
FIG. 1 is a block diagram of an implementation flow of the present invention;
FIG. 2 is an engine external map;
fig. 3 is a schematic diagram of the actual effect after the method is adopted.
Detailed Description
As shown in fig. 1, the invention provides a method for controlling the exhaust temperature of an electronically controlled diesel engine based on thermal ratio, which comprises the following specific steps:
step one, reading the running parameters of an engine controller in the current period;
the operation parameters of the engine controller in the current period comprise an air inlet temperature CT, an air inlet flow CF and an air outlet temperature EG k Intake pressure PRESS, engine speed N Eng Fuel injection advance angle FSS _ SOI and expected fuel injection quantity FL cmd ；
Step two, filtering treatment of exhaust temperature;
in order to improve the consistency of exhaust temperature signals and avoid noise interference, the read exhaust temperature is subjected to first-order inertial filtering to obtain an engine exhaust temperature filtering value, and the calculation formula is as follows:
EG＝(EG k -EG k-1 )·C f +EG k
wherein EG represents a current period exhaust temperature filtering value; EG k Representing the initial value of the exhaust temperature in the current period; EG k-1 Representing a filtered value of the exhaust temperature of the last period; c f Selecting the inertial coefficient according to the proportion relation between the current period and the previous period, wherein the value range is 0-1;
step three, calculating the dynamic operation upper limit threshold value of the exhaust temperature
Calculating the dynamic operation upper limit threshold of the exhaust temperature according to the high-temperature limit value of the exhaust of the engine, the filter value of the exhaust temperature of the engine in the current period obtained in the step two and the inlet air temperature, wherein the calculation formula is as follows:
EM TU ＝((C_TH U -EG)·C_T G +C_TH U )-CT
wherein, C _ TH U The exhaust high-temperature limit value of the engine is expressed, and is calibrated according to the model of the engine, and the value range is (600-900) DEG C; c _ T G The exhaust temperature gain factor is calibrated according to the model of the engine, and the value range is 0-1;
step four, calculating the thermal proportional temperature EF;
the heat proportional temperature EF consists of four parts, and the calculation step formula is as follows:
EF＝C_offset+C_SOI*FSS_SOI+C_BOOST*PRESS+C_SPEED*N Eng wherein, C _ offset is a thermal proportional temperature compensation value, and the value range is as follows: (500-600) DEG C;
c _ SOI is an oil injection advance angle factor, and the value range is as follows: -200 to-100 ℃/deg.;
FSS _ SOI is the fuel injection advance angle of the current period;
c _ BOOST is the value range of the intake pressure factor: (10-20) DEG C/kPa;
PRESS is the intake pressure of the current cycle;
c _ SPEED is a product factor of the engine SPEED, and the value range is as follows: (2-3) DEG C/rpm;
N Eng is as followsEngine speed of the previous cycle;
fifthly, calculating an exhaust temperature fuel injection quantity threshold FL Lim The calculation formula is as follows:
wherein EF is the thermal proportional temperature; CF is the intake flow of the current period;
sixthly, calculating the limit value FL of the fuel injection quantity per stroke of the exhaust temperature stroke ；
The limit value of the oil injection quantity of each stroke of the exhaust temperature is calculated according to the threshold value of the oil injection quantity of the exhaust temperature, the rotating speed of an engine and the number of cylinders of an internal combustion engine, and the specific calculation formula is as follows:
wherein N is Eng Is the engine speed; cy is a Cy-is Eng The number of cylinders of the internal combustion engine;
step seven, calculating the limit value of the exhaust temperature oil quantity of the engine;
carrying out amplitude limiting processing through the upper limit value of the exhaust temperature oil quantity of the engine, the lower limit value of the exhaust temperature oil quantity and the oil injection quantity limit value of each stroke of the exhaust temperature to obtain the exhaust temperature oil quantity limit value FL of the engine final The calculation formula is as follows:
FL final ＝MAX{MIN(FL stroke ，C_FL ULim )，C_FL LLim }
wherein FL final The limit value of the exhaust temperature oil quantity of the engine is set; c _ FL ULim The upper limit value of the temperature oil discharge amount is set; the value is calibrated according to the model of the engine, and the value range is (400-500) mg/stroke; c _ FL lLim The temperature-exhaust oil quantity lower limit value is realized according to the calibration of the engine model, and the value range is (200-300) mg/stroke;
step eight, calculating the final engine output fuel injection quantity FL total ；
And limiting the expected fuel injection quantity in the current period by the limit value of the exhaust temperature oil quantity of the engine to obtain the final output fuel injection quantity of the engine, wherein the calculation formula is as follows:
FL total ＝MIN(FL final ，FL cmd )
wherein FL cmd The expected engine fuel injection quantity of the current period;
and step nine, controlling the exhaust temperature through the final engine oil injection amount.
The following describes the practical application of the control method of the present invention in the project of a high-pressure common rail diesel engine with an electronic controller.
For a certain high-pressure common rail diesel engine, the cylinder number is 6 cylinders, the engine displacement is 6.7L, the maximum engine torque is 850N, the rated rotation speed is 2500r/min, and the external characteristics are shown in figure 2. The working steps are as follows:
1. installing the engine on an engine rack, and adjusting the throttle opening to enable the engine to operate under the external characteristic working condition;
2. the controller takes 10ms as a period to control the air inlet temperature CT, the air inlet flow CF and the exhaust temperature EG of the engine k Intake pressure PRESS, fuel injection advance angle FSS _ SOI, and engine speed N Eng Fuel injection advance angle FSS _ SOI and expected fuel injection quantity FL cmd
3. Adopting the formula in the step two to measure the current engine exhaust temperature EG k Filtering to obtain a filtering value of the exhaust temperature of the engine in the current period; when calculating, C f Set to 0.2;
4. calculating the dynamic operation upper limit threshold of the exhaust temperature by adopting a formula in the step three, wherein during calculation, C _ TH U At 750 ℃; c _ T G Is 0.9;
5. calculating the thermal proportional temperature by adopting a formula in the fourth step;
when calculating, C _ offset is 550 ℃;
c _ SOI is-150 ℃/°;
c _ BOOST is 15 ℃/kPa;
c _ SPEED is 2.5 ℃/rpm;
6. calculating the exhaust gas by adopting the formulas in the fifth step and the sixth stepThe temperature fuel injection quantity threshold value and the exhaust temperature fuel injection quantity limit value per stroke are calculated as follows: c _ FL ULim Is 400mg/stroke, C _ FL lLim 200 mg/stroke;
7. carrying out amplitude limiting processing through an upper limit value of the exhaust temperature oil quantity of the engine, a lower limit value of the exhaust temperature oil quantity and a limit value of the oil injection quantity per stroke of the exhaust temperature to obtain the limit value of the exhaust temperature oil quantity of the engine;
8. and limiting the current expected fuel injection quantity by the limit value of the exhaust temperature oil quantity of the engine to obtain the final output fuel injection quantity of the engine.
The air-fuel ratio is verified under the external characteristic working condition aiming at different engine speeds, and the verification result is shown in figure 3. When the rotating speed is in the range of 2500 r/min-2650 r/min, the final output fuel injection quantity of the engine is equal to the limit value of the exhaust temperature fuel quantity of the engine.
Claims (4)
1. A method of controlling an exhaust temperature of an electronically controlled diesel engine based on a thermal ratio, comprising the steps of:
reading operation parameters of an engine controller in a current period;
the operation parameters of the engine controller in the current period comprise an intake air temperature CT, an intake air flow CF and an exhaust air temperature EG k Intake pressure PRESS, engine speed N Eng Fuel injection advance angle FSS _ SOI and expected fuel injection quantity FL cmd ；
Step two, filtering the exhaust temperature;
performing first-order inertial filtering on the read exhaust temperature to obtain an engine exhaust temperature filtering value;
the calculation formula of the engine exhaust temperature filter value is as follows:
EG＝(EG k -EG k-1 )·C f +EG k
EG represents a current period exhaust temperature filter value; EG k Representing the initial value of the exhaust temperature in the current period; EG k-1 Representing a filtered value of the exhaust temperature of the last period; c f Selecting the inertial coefficient according to the proportion relation between the current period and the previous period, wherein the value range is 0-1;
step three, calculating the dynamic operation upper limit threshold value of the exhaust temperature
Calculating an exhaust temperature dynamic operation upper limit threshold EM according to the engine exhaust high temperature limit value, the current period engine exhaust temperature filter value obtained in the step two and the air inlet temperature TU ；
The calculation formula of the exhaust temperature dynamic operation upper limit threshold is as follows:
EM TU ＝((C_TH U -EG)·C_T G +C_TH U )-CT
wherein, C _ TH U Representing the high-temperature limit value of the engine exhaust, and calibrating according to the model of the engine; c _ T G The exhaust temperature gain factor is calibrated according to the model of the engine;
step four, calculating the thermal proportional temperature EF;
the heat proportional temperature EF consists of four parts, and the calculation step formula is as follows:
EF＝C_offset+C_SOI*FSS_SOI+C_BOOST*PRESS+C_SPEED*N Eng wherein, C _ offset is the thermal proportion temperature compensation value, and the value range is: (500-600) DEG C;
c _ SOI is an oil injection advance angle factor, and the value range is as follows: -200 to-100 ℃/deg.;
FSS _ SOI is the fuel injection advance angle of the current period;
c _ BOOST is the value range of the intake pressure factor: (10-20) DEG C/kPa;
PRESS is the intake pressure of the current cycle;
c _ SPEED is a product factor of the engine SPEED, and the value range is as follows: (2-3) DEG C/rpm;
N Eng the engine speed of the current cycle;
step five, calculating an exhaust temperature fuel injection quantity threshold value FL Lim The calculation formula is as follows:
wherein EF is the thermal proportional temperature; CF is the intake air flow of the current period;
sixthly, calculating the limit value FL of the fuel injection quantity per stroke of the exhaust temperature stroke ；
The limit value of the oil injection quantity of each stroke of the exhaust temperature is calculated according to the threshold value of the oil injection quantity of the exhaust temperature, the rotating speed of the engine and the number of cylinders of the internal combustion engine, and the specific calculation formula is as follows:
wherein N is Eng Is the engine speed; cy (Cy) Eng The number of cylinders of the internal combustion engine;
step seven, calculating the limit value of the exhaust oil temperature of the engine;
carrying out amplitude limiting processing through the upper limit value of the exhaust temperature oil quantity of the engine, the lower limit value of the exhaust temperature oil quantity and the oil injection quantity limit value of each stroke of the exhaust temperature to obtain the exhaust temperature oil quantity limit value FL of the engine final ；
Step eight, calculating the final output fuel injection quantity of the engine;
limiting the expected fuel injection quantity in the current period by the limit value of the exhaust temperature fuel quantity of the engine to obtain the final output fuel injection quantity FL of the engine total ；
And step nine, controlling the exhaust temperature through the final starting fuel injection amount.
2. The method of controlling an electronically controlled diesel engine exhaust temperature based on thermal proportioning of claim 1 wherein: the high-temperature limit value C _ TH of the exhaust gas of the engine in the third step U The value range of (2) is (600-900) DEG C; exhaust temperature gain factor C _ T G The value range of (1) is 0-1.
3. The method of controlling an electronically controlled diesel engine exhaust temperature based on thermal proportioning of claim 2 wherein: the seventh step is that the engine exhaust temperature oil quantity limit value FL final The calculation formula of (c) is:
FL final ＝MAX{MIN(FL stroke ，C_FL ULim )，C_FL LLim }；
wherein FL final The limit value of the exhaust temperature oil quantity of the engine is set; c _ FL ULim The upper limit value of the temperature oil discharge amount is set; the value is calibrated according to the model of the engine, and the value range is (400-500) mg/stroke; c _ FL lLim The temperature-exhaust oil quantity lower limit value is realized according to the calibration of the engine model, and the value range is (200-300) mg/stroke.
4. The method of controlling an electronically controlled diesel engine exhaust temperature based on thermal proportioning of claim 3, wherein: and in the step eight, the calculation formula of the final engine output fuel injection quantity is as follows:
FL total ＝MIN(FL final ，FL cmd )；
wherein FL cmd The expected engine fueling for the current cycle.
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