CN112302815A - 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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- CN112302815A CN112302815A CN202011194858.8A CN202011194858A CN112302815A CN 112302815 A CN112302815 A CN 112302815A CN 202011194858 A CN202011194858 A CN 202011194858A CN 112302815 A CN112302815 A CN 112302815A
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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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- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- 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 value; 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 the 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 intake air temperature CT, an intake air flow CF and an exhaust air temperature EGkIntake pressure PRESS, engine speed NEngFuel injection advance angle FSS _ SOI and expected fuel injection quantity FLcmd；
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 threshold, the current period engine exhaust temperature filter value and the intake temperature obtained in the step twoTU；
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*NEng
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;
NEngthe engine speed of the current cycle;
step five, calculating an exhaust temperature fuel injection quantity threshold value FLLimThe 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 temperaturestroke；
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 isEngIs the engine speed; cy is a Cy-EngThe 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 enginefinal；
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 enginetotal；
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＝(EGk-EGk-1)·Cf+EGk
EG represents a current period exhaust temperature filter value; EGkRepresenting the initial value of the exhaust temperature of the current period; EGk-1Representing a filtered value of the exhaust temperature of the last period; cfAnd 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 exhaust temperature dynamic operation upper limit threshold in the third step is as follows: EMTU＝((C_THU-EG)·C_TG+THT)-CT
Wherein, C _ THURepresenting the high-temperature limit value of the engine exhaust, and calibrating according to the model of the engine; c _ TGAnd the gain factor is an exhaust temperature gain factor and is calibrated according to the model of the engine.
Further, the engine exhaust high temperature limit value C _ T in the third stepHUThe value range of (2) is (600-900) DEG C; exhaust temperature gain factor C _ TGThe value range of (1) is 0-1.
Further, the limit value FL of the exhaust temperature oil quantity of the engine in the seventh stepfinalThe calculation formula of (2) is as follows: FLfinal＝MAX{MIN(FLstroke,C_FLULim),C_FLLLim}；
Wherein FLfinalThe limit value of the exhaust temperature oil quantity of the engine is set; c _ FLULimThe 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 _ FLlLimThe 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 calculation formula of the final engine output fuel injection quantity in the step eight is as follows:
FLtotal＝MIN(FLfinal,FLcmd)
wherein FLcmdThe 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 air inlet temperature, the air inlet flow, the exhaust temperature, the air inlet pressure, the engine speed, the fuel injection advance angle, the expected fuel injection quantity and the like of the engine, and accurately calculates the fuel injection quantity output by the engine in each period by adopting the program algorithm input on the engine controller to realize the accurate control of the exhaust temperature of the engine.
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:
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 EGkIntake pressure PRESS, engine speed NEngFuel injection advance angle FSS _ SOI and expected fuel injection quantity FLcmd；
Step two, filtering treatment of exhaust temperature;
in order to improve the consistency of exhaust temperature signals and avoid noise interference, first-order inertial filtering is carried out on the read exhaust temperature to obtain an engine exhaust temperature filtering value, and the calculation formula is as follows:
EG＝(EGk-EGk-1)·Cf+EGk
EG represents a current period exhaust temperature filter value; EGkRepresenting the initial value of the exhaust temperature of the current period; EGk-1Representing a filtered value of the exhaust temperature of the last period; cfSelecting 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 threshold 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:
EMTU＝((C_THU-EG)·C_TG+THT)-CT
wherein, C _ THUThe 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 _ TGThe 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*NEng
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;
NEngthe engine speed of the current cycle;
step five, calculating an exhaust temperature fuel injection quantity threshold value FLLimThe 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 temperaturestroke；
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 isEngIs the engine speed; cy is a Cy-EngThe number of cylinders of the internal combustion engine;
step seven, calculating the limit value of the exhaust temperature oil quantity of the engine;
through the upper limit value of the exhaust temperature oil mass and the lower limit value of the exhaust temperature oil mass of the engineLimiting the limit value and the limit value of the oil injection amount of each stroke of the exhaust temperature to obtain the limit value FL of the exhaust temperature oil amount of the enginefinalThe calculation formula is as follows:
FLfinal＝MAX{MIN(FLstroke,C_FLULim),C_FLLLim}
wherein FLfinalThe limit value of the exhaust temperature oil quantity of the engine is set; c _ FLULimThe 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 _ FLlLimThe 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 FLtotal；
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:
FLtotal＝MIN(FLfinal,FLcmd)
wherein FLcmdThe expected engine fuel injection quantity of the current period;
and step nine, controlling the exhaust temperature through the final fuel injection amount of the engine.
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 enginekIntake pressure PRESS, fuel injection advance angle FSS _ SOI, and engine speed NEngFuel injection advance angle FSS _ SOI and expected fuel injection quantity FLcmd
3. Adopting the formula in the step two to measure the current engine exhaust temperature EGkFiltering to obtain a filtering value of the exhaust temperature of the engine in the current period; when calculating, CfSet 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 _ THUAt 750 ℃; c _ TGIs 0.9;
5. calculating the thermal proportional temperature by adopting a formula in the step four;
when calculating, C _ offset is 550 ℃;
c _ SOI is-150 ℃/°;
c _ BOOST is 15 ℃/kPa;
c _ SPEED is 2.5 ℃/rpm;
6. calculating an exhaust temperature oil injection quantity threshold value and an exhaust temperature oil injection quantity limit value per stroke by adopting formulas in the fifth step and the sixth step, wherein during calculation: c _ FLULimIs 400mg/stroke, C _ FL lLim200 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 was verified for different engine speeds under the external characteristic conditions, with the verification results shown in fig. 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 (6)
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 EGkIntake pressure PRESSEngine speed NEngFuel injection advance angle FSS _ SOI and expected fuel injection quantity FLcmd；
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 threshold, the current period engine exhaust temperature filter value and the intake temperature obtained in the step twoTU；
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*NEng
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;
NEngthe engine speed of the current cycle;
step five, calculating an exhaust temperature fuel injection quantity threshold value FLLimThe 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 temperaturestroke；
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 isEngIs the engine speed; cy is a Cy-EngThe 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 enginefinal；
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 enginetotal；
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 calculation formula of the engine exhaust temperature filter value in the second step is as follows: EG ═ E (EG)k-EGk-1)·Cf+EGk
EG represents a current period exhaust temperature filter value; EGkRepresenting the initial value of the exhaust temperature of the current period; EGk-1Representing a filtered value of the exhaust temperature of the last period; cfAnd selecting the inertial coefficient according to the proportion relation between the current period and the previous period, wherein the value range is 0-1.
3. The method of controlling an electronically controlled diesel engine exhaust temperature based on thermal proportioning of claim 2, wherein: the dynamic operation of calculating the exhaust temperature in the third stepThe upper threshold is calculated by the formula: EMTU＝((C_THU-EG)·C_TG+THT)-CT
Wherein, C _ THURepresenting the high-temperature limit value of the engine exhaust, and calibrating according to the model of the engine; c _ TGAnd the gain factor is an exhaust temperature gain factor and is calibrated according to the model of the engine.
4. The method of controlling an electronically controlled diesel engine exhaust temperature based on thermal proportioning of claim 3, wherein: the high-temperature limit value C _ TH of the exhaust gas of the engine in the third stepUThe value range of (2) is (600-900) DEG C; exhaust temperature gain factor C _ TGThe value range of (1) is 0-1.
5. The method of controlling an electronically controlled diesel engine exhaust temperature based on thermal proportioning of claim 4 wherein: the seventh step is that the engine exhaust temperature oil quantity limit value FLfinalThe calculation formula of (2) is as follows: FLfinal＝MAX{MIN(FLstroke,C_FLULim),C_FLLLim}；
Wherein FLfinalThe limit value of the exhaust temperature oil quantity of the engine is set; c _ FLULimThe 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 _ FLlLimThe 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.
6. The method of controlling an electronically controlled diesel engine exhaust temperature based on thermal proportioning of claim 5, wherein: and in the step eight, the calculation formula of the final engine output fuel injection quantity is as follows: FLtotal＝MIN(FLfinal,FLcmd)；
Wherein FLcmdThe desired engine fueling for the current cycle.
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