CN114810400B - Fuel injection quantity control method, device and system - Google Patents

Fuel injection quantity control method, device and system Download PDF

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Publication number
CN114810400B
CN114810400B CN202210507032.5A CN202210507032A CN114810400B CN 114810400 B CN114810400 B CN 114810400B CN 202210507032 A CN202210507032 A CN 202210507032A CN 114810400 B CN114810400 B CN 114810400B
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valve
exhaust
air
engine
determining
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CN114810400A (en
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窦站成
王新校
王晓云
李俊琦
陈彦波
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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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
    • 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
    • F02D41/0002—Controlling intake air
    • F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
    • 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
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1445—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being related to the exhaust flow
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supercharger (AREA)

Abstract

The invention discloses a method, a device and a system for controlling oil injection quantity. The fuel injection amount control method includes: determining an engine exhaust pulse pressure curve, acquiring physical parameters of a deflation valve, and calculating the opening of the deflation valve according to the engine exhaust pulse pressure curve and the physical parameters of the deflation valve; calculating the air bleeding amount according to the opening degree of the air bleeding valve, and judging whether the maximum oil injection amount needs to be limited or not by adopting the air bleeding amount; wherein determining an engine exhaust pulse pressure profile comprises: acquiring an air discharge pressure measurement value, an air discharge pulse crest coefficient and an air discharge pulse trough coefficient, and determining a crest parameter of a pressure curve crest and a trough parameter of a pressure curve trough according to the air discharge pressure measurement value, the air discharge pulse crest coefficient and the air discharge pulse trough coefficient; and acquiring exhaust valve parameters, and determining a first time length between two adjacent pressure curve peaks and a second time length between two adjacent pressure curve troughs according to the exhaust valve parameters.

Description

Fuel injection quantity control method, device and system
Technical Field
The embodiment of the invention relates to an engine control technology, in particular to a method, a device and a system for controlling fuel injection quantity.
Background
At present, the turbocharging technology is widely applied in the field of diesel engines, the turbocharging technology can improve the volumetric efficiency of the cylinder charge of the engine, improve the air-fuel ratio, greatly increase the power of the engine and simultaneously reduce the smoke intensity of exhaust gas, the temperature of the exhaust gas and the heat load of the engine.
In some operating scenarios, the turbocharger speed may increase due to changes in ambient pressure, and if the turbocharger speed exceeds the limit of the reliable speed, the turbocharger may be damaged by over-speed. After the rotation speed of the turbocharger exceeds a certain value, the turbocharger needs to be protected, and the general protection strategy is as follows: limiting the fuel injection quantity of the engine; the air release valve is opened to release air.
This method is not the first preferred method because it avoids the problem of engine power drop when the turbocharger is over-speed by limiting the amount of fuel injected into the engine. When avoiding turbo charger to surpass speed through the mode of opening the bleed valve, can guarantee to protect turbo charger under the condition that engine power does not descend, nevertheless after opening the bleed valve, under certain operating mode, the not enough condition of air release can appear, turbo charger still has the overspeed risk this moment, needs further restriction oil spout volume this moment to guarantee to realize turbo charger's protection.
In actual conditions, factors influencing the calculation accuracy of the air bleeding amount are complex, and in the prior art, the calculation accuracy of the air bleeding amount is low, so that the overspeed protection effect of the turbocharger is poor under certain conditions.
Disclosure of Invention
The invention provides a method, a device and a system for controlling an oil injection amount, which aim to accurately calculate an air discharge amount and further effectively ensure that an overspeed fault does not occur in a turbocharger.
In a first aspect, an embodiment of the present invention provides an oil injection amount control method, including:
determining an engine exhaust pulse pressure curve, acquiring physical parameters of a deflation valve, and calculating the opening of the deflation valve according to the engine exhaust pulse pressure curve and the physical parameters of the deflation valve;
calculating the air bleeding amount according to the opening degree of the air bleeding valve, and judging whether the maximum oil injection amount needs to be limited or not by adopting the air bleeding amount;
wherein determining the engine exhaust pulse pressure profile comprises:
acquiring an air discharge pressure measurement value, an air discharge pulse crest coefficient and an air discharge pulse trough coefficient, and determining a crest parameter of a pressure curve crest and a trough parameter of a pressure curve trough according to the air discharge pressure measurement value, the air discharge pulse crest coefficient and the air discharge pulse trough coefficient;
acquiring exhaust valve parameters, and determining a first time length between two adjacent pressure curve peaks and a second time length between two adjacent pressure curve troughs according to the exhaust valve parameters.
Optionally, the step of determining whether the maximum fuel injection amount needs to be limited by using the purge amount comprises:
acquiring altitude measurement data, determining a deflation proportion threshold corresponding to the altitude measurement data, and limiting the maximum fuel injection quantity if the deflation quantity is less than the deflation proportion threshold.
Optionally, acquiring an exhaust condition parameter;
calculating the opening of the air bleed valve according to the exhaust pulse pressure curve of the engine, the physical parameters of the air bleed valve and the exhaust working condition parameters;
the exhaust condition parameters include: post-press pressure, ambient pressure, post-treatment backpressure.
Optionally, determining the aftertreatment backpressure comprises:
obtaining the air input of an engine and the oil injection quantity of the engine, and determining the total flow of the exhaust gas according to the air input of the engine and the oil injection quantity of the engine;
determining the aftertreatment backpressure based on a pressure differential MAP using the total exhaust flow, ambient pressure.
Optionally, calculating the purge amount according to the purge valve opening degree includes:
determining a flow coefficient based on a flow coefficient MAP using the bleed valve opening;
and calculating the air bleeding amount by adopting the flow coefficient, the post-processing back pressure and the area of the air bleeding valve hole.
Optionally, the obtaining of the peak coefficient and the trough coefficient of the exhaust pulse includes:
obtaining the rotating speed of an engine and the fuel injection quantity of the engine, and determining the exhaust pulse crest coefficient based on a crest coefficient MAP graph by adopting the rotating speed of the engine and the fuel injection quantity of the engine;
and determining the trough coefficient of the exhaust pulse based on a trough coefficient MAP graph by adopting the engine speed and the engine fuel injection quantity.
Optionally, the exhaust valve parameters include: the opening duration of the exhaust valves and the number of the exhaust valves;
the first time length is determined according to the number of the exhaust valves, and the second time length is determined according to the opening duration of the exhaust valves.
Optionally, the physical parameters of the purge valve include:
the air release valve comprises air release valve spring rigidity, air release valve hole area, air release valve spring pre-tightening force, air release valve top diaphragm area, air release valve pressure end force arm, air release valve turbine end force arm and air release valve installation angle.
In a second aspect, an embodiment of the present invention further provides an oil injection amount control apparatus, including an oil injection amount control unit, where the oil injection amount control unit is configured to:
determining an engine exhaust pulse pressure curve, acquiring physical parameters of a deflation valve, and calculating the opening of the deflation valve according to the engine exhaust pulse pressure curve and the physical parameters of the deflation valve;
calculating the air bleeding amount according to the opening degree of the air bleeding valve, and judging whether the maximum oil injection amount needs to be limited or not by adopting the air bleeding amount;
wherein determining the engine exhaust pulse pressure profile comprises:
acquiring an air bleeding pressure measured value, an air bleeding pulse crest coefficient and an air bleeding pulse trough coefficient, and determining a crest parameter of a pressure curve crest and a trough parameter of a pressure curve trough according to the air bleeding pressure measured value, the air bleeding pulse crest coefficient and the air bleeding pulse trough coefficient;
acquiring exhaust valve parameters, and determining a first time length between two adjacent pressure curve peaks and a second time length between two adjacent pressure curve troughs according to the exhaust valve parameters.
In a third aspect, an embodiment of the present invention further provides an oil injection amount control system, which includes a controller, where the controller is configured with an executable program, and when the executable program runs, the oil injection amount control method described in the embodiment of the present invention is implemented.
Compared with the prior art, the invention has the beneficial effects that: the invention provides an oil injection quantity control method which comprises the steps of determining an engine exhaust pulse pressure curve, determining the opening of a bleeder valve based on the engine exhaust pulse pressure curve, further determining the air bleeding quantity, and judging whether the maximum oil injection quantity needs to be limited or not according to the air bleeding quantity. Based on the engine exhaust pulse pressure curve, when calculating through the bleeder valve aperture, calculate the bleeder valve aperture based on the pressure in the exhaust pipe that more accords with actual conditions (and be the pressure that the pulse waveform changes), compare in calculating the bleeder valve aperture based on the average pressure in the exhaust pipe, can improve the precision of the bleeder valve aperture that calculates, and then the accurate maximum fuel injection limit that carries on effectively avoids the bleed volume to be too little, if carry on the maximum fuel injection limit, the problem that the turbine rotational speed that causes is overspeed.
Drawings
FIG. 1 is a flowchart of an injection amount control method in an embodiment;
FIG. 2 is a schematic view of a configuration of a purge valve in the embodiment;
FIG. 3 is a flowchart of another fuel injection amount control method in the embodiment;
FIG. 4 is a schematic diagram of an engine system in an embodiment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of an injection quantity control method in an embodiment, and referring to fig. 1, the embodiment proposes an injection quantity control method including:
s101, determining an engine exhaust pulse pressure curve.
For example, in the present embodiment, the fuel injection amount control method is applied to fuel injection amount control of an engine system equipped with a turbocharger device.
For example, when the engine is in operation, in an exhaust pipeline between the engine and an after-treatment device (such as an oxidation-type catalytic converter, a particulate trap and the like) in a period from opening to closing of an exhaust valve of the engine, a pressure change curve in the exhaust pipeline is approximate to a single-pulse curve, and in the embodiment, the pressure change in the exhaust pipeline during the operation of the engine is represented by the engine exhaust pulse pressure curve.
Illustratively, in this embodiment, determining the engine exhaust pulse pressure profile includes:
acquiring an air discharge pressure measurement value, an air discharge pulse crest coefficient and an air discharge pulse trough coefficient, and determining a crest parameter of a pressure curve crest and a trough parameter of a pressure curve trough according to the air discharge pressure measurement value, the air discharge pulse crest coefficient and the air discharge pulse trough coefficient;
and acquiring exhaust valve parameters, and determining a first time length between two adjacent pressure curve peaks and a second time length between two adjacent pressure curve troughs according to the exhaust valve parameters.
Illustratively, in the present embodiment, the measurement of the bleed air pressure is provided by a bleed air pressure sensor disposed in the exhaust line between the engine and the aftertreatment device, the measurement of the bleed air pressure sensor being an average of the pressure in the exhaust line.
For example, in this embodiment, the peak coefficient and the trough coefficient of the exhaust pulse are preset values, the pressure average value is P, the peak coefficient of the exhaust pulse is denoted as C _ P, the trough coefficient of the exhaust pulse is denoted as C _ T, the peak parameter is denoted as P _ P, and the trough parameter is denoted as P _ T, and then the peak parameter is calculated according to the following formula:
P_P＝f(P,C_P)
the trough parameter is calculated according to:
P_T＝-f(P,C_T)
for example, in this embodiment, the specific expression of the function f is not particularly limited.
For example, in the present embodiment, the exhaust valve parameter includes at least the number of exhaust valves disposed on the engine, and in addition, the exhaust valve parameter may further include one or more of an exhaust valve opening duration, an exhaust valve closing duration, an exhaust valve early opening angle, and an exhaust valve early closing angle.
For example, in one possible embodiment, setting the exhaust valve parameter comprises: the opening duration of the exhaust valves and the number of the exhaust valves;
and determining a first time length between two adjacent pressure curve peaks according to the number of the exhaust valves, and determining a second time length between two adjacent pressure curve troughs according to the opening duration of the exhaust valves.
For example, in the above scheme, the number of cylinders of the engine is determined by the number of exhaust valves, the number of cylinders of the engine is recorded as Cyl _ num, and the first time period is recorded as t1, and then the first time period is calculated according to the following formula:
t1＝720/Cyl_num
for example, in the above scheme, when the exhaust valve opening duration is denoted as V _ t and the second time period is denoted as t2, the second time period is calculated according to the following formula:
t2＝V_t
for example, in the above scheme, the specific value of the opening duration of the exhaust valve is related to the design parameters of the cam arranged on the crankshaft of the engine and the related control strategy, and the opening duration of the exhaust valve is usually a fixed value for one engine.
For example, in the present embodiment, after determining the peak parameter and the first time period, a first engine exhaust pulse pressure curve between two adjacent peaks may be fitted based on a trigonometric function;
after the wave trough parameters and the second time length are determined, fitting a second engine exhaust pulse pressure curve between two adjacent wave troughs on the basis of a trigonometric function;
and forming a complete engine exhaust pulse pressure curve through the first engine exhaust pulse pressure curve and the second engine exhaust pulse pressure curve.
And S102, calculating the opening of the air release valve according to the exhaust pulse pressure curve of the engine and the physical parameters of the air release valve.
In an exemplary embodiment, the physical parameters of the purge valve at least include a force arm at a pressure end of the purge valve, a force arm at a turbine end of the purge valve, a spring stiffness of the purge valve, and a pre-tightening force of a spring of the purge valve.
Fig. 2 is a schematic structural diagram of a bleed valve in an embodiment, referring to fig. 2, the bleed valve is disposed on the turbine shell, the bleed valve includes a bleed valve actuating assembly, and under a bleed condition, the bleed valve assembly is actuated, the bypass hole is opened, and high-temperature exhaust gas passes through the bypass hole and then directly enters the turbine outlet through the bypass channel, so as to reduce the work amount of the high-temperature exhaust gas on the turbine, and further reduce the boost pressure of the turbocharger.
Referring to fig. 2, the bleed valve actuation assembly includes a bleed valve pressure end proximate the exhaust line, a bleed valve turbine end proximate the turbine shell.
Illustratively, the air release valve executing assembly at the air release valve pressure end comprises a spring and a first connecting rod, and when the air release valve pressure end is stressed, the spring can drive the connecting rod to move towards the turbine shell along the air release valve mounting direction;
the air release valve execution component at the turbine end of the air release valve comprises a second connecting rod, and when the second connecting rod is stressed, the second connecting rod can rotate around a connecting point with the first connecting rod;
in the air release valve, the position of the first connecting rod and the position of the second connecting rod jointly determine the opening degree (namely the opening degree of the bypass hole) of the air release valve.
Illustratively, in this embodiment, the force applied to the set bleed valve pressure port is related to the pressure in the exhaust line and the force applied to the turbine port of the bleed valve is related to the set bleed valve control command.
For example, based on an engine exhaust pulse pressure curve, the pressure in the exhaust pipeline at the current calculation moment can be determined, so that a first stress value of the pressure end of the air release valve is determined, and a second stress value of the turbine end of the air release valve can be determined based on an air release valve control instruction;
the moment of the pressure end of the air release valve can be determined by adopting the first stress value and the moment arm of the pressure end of the air release valve, and the moment of the turbine end of the air release valve can be determined by adopting the second stress value and the moment arm of the turbine end of the air release valve;
the deformation of the spring can be determined based on the moment of the pressure end of the air release valve, the moment of the turbine end of the air release valve, the rigidity of the spring of the air release valve and the pretightening force of the spring of the air release valve, so that the first connecting rod can be determined, and the opening degree of the air release valve can be determined by combining the position of the second connecting rod.
For example, in one possible embodiment, the bleed valve opening may also be calculated based on the engine exhaust pulse pressure curve, the bleed valve physical parameters, and the exhaust condition parameters.
For example, in the above scheme, to improve the accuracy of the calculated opening of the purge valve, the physical parameters of the purge valve may include a spring stiffness of the purge valve, an area of a vent hole of the purge valve, a pre-tightening force of the spring of the purge valve, an area of a diaphragm at the top of the purge valve, a force arm at a pressure end of the purge valve, a force arm at a turbine end of the purge valve, and an installation angle of the purge valve.
For example, ambient pressure may be used as a factor that affects the pressure inside the exhaust line, and in the above scheme, the exhaust condition parameter includes at least ambient pressure.
For example, a third force value at the pressure end of the bleed valve may be determined based on the engine exhaust pulse pressure curve, ambient pressure, and a diaphragm area at the top of the bleed valve;
determining a fourth force value of the turbine end of the bleed valve based on the engine exhaust pulse pressure curve, the ambient pressure and the area of the bleed valve orifice (i.e. the area of the bypass orifice), and determining a fifth force value of the turbine end of the bleed valve based on the bleed valve control command;
the force arm of the pressure end of the air release valve can be determined based on the installation angle of the air release valve, and the moment of the pressure end of the air release valve can be determined by adopting a third force bearing value and the force arm of the pressure end of the air release valve;
the moment arm at the turbine end of the deflation valve can be determined based on the installation angle of the deflation valve, the moment at the turbine end of the first deflation valve can be determined by adopting a fifth stress value and the moment arm at the turbine end of the deflation valve, and the moment at the turbine end of the second deflation valve can be determined by adopting a fourth stress value and the moment arm at the turbine end of the deflation valve;
the deformation of the spring can be determined based on the moment of the pressure end of the deflation valve, the moment of the turbine end of the first deflation valve, the moment of the turbine end of the second deflation valve, the rigidity of the spring of the deflation valve and the pretightening force of the spring of the deflation valve, and then the opening of the deflation valve is determined.
For example, in this embodiment, functions used for calculating the third stress value and the fourth stress value are not specifically limited, and the form of the functions may be designed according to actual situations.
S103, calculating the air release amount according to the opening of the air release valve.
For example, when the opening degree of the purge valve is determined, the purge flow corresponding to the opening degree of the purge valve may be determined, and the purge flow in a calculation cycle may be determined by integrating the purge flow.
For example, in this embodiment, the unit and the value of the calculation period may be set according to actual requirements, and specific contents are not specifically limited.
And S104, adopting the air bleeding amount to judge whether the maximum oil injection amount needs to be limited.
For example, in the present embodiment, the purge amount calculated in step S103 is used as a basis for determining whether the maximum fuel injection amount needs to be limited.
For example, when the air release amount is smaller than the set air release ratio threshold value, the maximum fuel injection amount is limited (i.e. the fuel injection amount cannot exceed the set maximum value), otherwise, the fuel injection amount is not limited.
For example, when limiting the maximum fuel injection quantity, the specific value of the maximum value of the fuel injection quantity may be determined according to a calibration test.
The embodiment provides an oil injection amount control method, which includes determining an engine exhaust pulse pressure curve, determining an opening degree of a bleed valve based on the engine exhaust pulse pressure curve, further determining a bleed amount, and judging whether the maximum oil injection amount needs to be limited or not according to the bleed amount. Based on the engine exhaust pulse pressure curve, when calculating through the bleeder valve aperture, calculate the bleeder valve aperture based on the pressure in the exhaust pipe that more accords with actual conditions (and be the pressure that the pulse waveform changes), compare in calculating the bleeder valve aperture based on the average pressure in the exhaust pipe, can improve the precision of the bleeder valve aperture that calculates, and then the accurate maximum fuel injection limit that carries on effectively avoids the bleed volume to be too little, if carry on the maximum fuel injection limit, the problem that the turbine rotational speed that causes is overspeed.
Fig. 3 is a flow chart of another fuel injection amount control method in an example, and referring to fig. 3, as an embodiment, the control method may further include:
s201, determining an engine exhaust pulse pressure curve.
For example, in this aspect, in the content described in step S101, the exhaust pulse crest coefficient and the exhaust pulse trough coefficient may be acquired as follows.
And obtaining the rotating speed of the engine and the fuel injection quantity of the engine, and determining the crest factor of the exhaust pulse based on the crest factor MAP graph by adopting the rotating speed of the engine and the fuel injection quantity of the engine.
And obtaining the rotating speed of the engine and the fuel injection quantity of the engine, and determining the trough coefficient of the exhaust pulse based on the trough coefficient MAP graph by adopting the rotating speed of the engine and the fuel injection quantity of the engine.
In the present embodiment, the crest factor MAP and the trough factor MAP are determined by a calibration test.
Illustratively, in the present scheme, the peak parameter is calculated according to the following formula:
C_P＝(P_P-P)/P
the trough parameter is calculated according to:
C_T＝(P-P_T)/P
s202, calculating the opening of the air release valve according to the exhaust pulse pressure curve of the engine, the physical parameters of the air release valve and the exhaust working condition parameters.
Exemplarily, in the scheme, the physical parameters of the air release valve comprise the spring stiffness of the air release valve, the area of an air release valve hole, the pretightening force of the air release valve spring, the area of a diaphragm at the top of the air release valve, the force arm of a pressure end of the air release valve, the force arm of a turbine end of the air release valve and the installation angle of the air release valve;
the exhaust condition parameters include post-pressure, ambient pressure, and post-treatment backpressure.
Fig. 4 is a schematic diagram of an engine system in an embodiment, and referring to fig. 4, the engine system is provided with a compressor, an intercooler, a turbine, and an aftertreatment device.
The first end of the compressor is connected with the air inlet manifold through the intercooler, the second end of the compressor is connected with the turbine, and the first end of the compressor is further provided with a post-pressure sensor which is used for adopting post-pressure.
In the scheme, the pressure of the first end of the compressor is indicated by the pressure gauge after the pressure is applied, and the pressure of the air inlet end of the aftertreatment device is indicated by aftertreatment backpressure.
Illustratively, in this embodiment, the aftertreatment backpressure is determined by:
obtaining the air input of an engine and the oil injection quantity of the engine, and determining the total flow of the exhaust gas based on an exhaust gas flow MAP chart by adopting the air input of the engine and the oil injection quantity of the engine;
the total flow of exhaust gas, ambient pressure, and based on a pressure differential MAP are used to determine the aftertreatment backpressure.
In the present embodiment, the exhaust gas flow MAP and the differential pressure MAP are determined by calibration tests.
In this scheme, regard as the factor that influences the bleed valve aperture with pressure after pressing pressure and aftertreatment backpressure simultaneously, confirm that the bleed valve aperture specifically includes:
illustratively, a sixth force value at the pressure end of the bleed valve may be determined based on the engine exhaust pulse pressure curve, ambient pressure, post-pressure, post-process backpressure, and a diaphragm area at the top of the bleed valve;
determining a seventh stress value of the turbine end of the deflation valve based on the exhaust pulse pressure curve of the engine, the ambient pressure, the post-pressure and the area of the deflation valve hole, and determining an eighth stress value of the turbine end of the deflation valve based on the control instruction of the deflation valve;
the force arm at the pressure end of the air release valve can be determined based on the installation angle of the air release valve, and the moment at the pressure end of the air release valve can be determined by adopting a sixth force bearing value and the force arm at the pressure end of the air release valve;
the moment arm at the turbine end of the deflation valve can be determined based on the installation angle of the deflation valve, the moment at the turbine end of the first deflation valve can be determined by adopting an eighth stress value and the moment arm at the turbine end of the deflation valve, and the moment at the turbine end of the second deflation valve can be determined by adopting a seventh stress value and the moment arm at the turbine end of the deflation valve;
the deformation of the spring can be determined based on the moment of the pressure end of the deflation valve, the moment of the turbine end of the first deflation valve, the moment of the turbine end of the second deflation valve, the rigidity of the spring of the deflation valve and the pretightening force of the spring of the deflation valve, and then the opening of the deflation valve is determined.
For example, in this embodiment, the functions used for calculating the sixth and seventh stress values are not specifically limited, and the form of the functions may be designed according to actual situations.
And S203, calculating the air release amount according to the opening degree of the air release valve.
For example, in the present embodiment, the following formula is used to calculate the purge amount:
m＝∫ 0 720 c·ρ·S·Vdβ
in the above equation, c represents a flow coefficient, ρ represents an exhaust gas density, S represents a purge valve orifice area, V represents an exhaust gas flow rate, and β represents a crank angle.
In the scheme, the opening degree of the air release valve is adopted, and the flow coefficient is determined based on a flow coefficient MAP (MAP).
In the present embodiment, the exhaust gas density and the exhaust gas flow rate are set to preset values, and the preset values are set to be constant when the crankshaft rotates.
Illustratively, based on the exhaust pulse pressure curve of the engine, the opening degree of the air release valve corresponding to different crank rotation angles is different when the crank rotates, and correspondingly, the flow coefficient is also different.
For example, in one possible embodiment, the amount of outgassing may be calculated using the following equation:
m＝Coor∫ 0 720 c·ρ·S·Vdβ
in the above equation, coor represents an exhaust expansion coefficient, and the exhaust expansion coefficient can be determined according to the aftertreatment backpressure, wherein the relationship between the aftertreatment backpressure and the exhaust expansion coefficient can be determined through a calibration test.
And S204, acquiring altitude measurement data, and determining a deflation proportion threshold value corresponding to the altitude measurement data.
In the scheme, the deflation proportion threshold values corresponding to different altitude measurement data are different, and the deflation proportion threshold values are used as reference values for judging whether the maximum fuel injection amount needs to be limited or not.
S205, determining whether the maximum oil injection quantity needs to be limited by adopting the air release quantity and the air release proportion threshold value.
For example, in the scheme, when the air release amount is smaller than the set air release ratio threshold, the maximum oil injection amount is limited, otherwise, the oil injection amount is not limited.
On the basis of the beneficial effects of the scheme shown in fig. 1, in the scheme, the air bleeding proportion threshold value is determined according to the altitude measurement data, and is used as a basic value for judging whether the maximum oil injection quantity needs to be limited, so that the oil injection quantity control method can effectively ensure that the turbine does not overspeed at different altitudes.
Example two
This embodiment provides a fuel injection quantity controlling means, including fuel injection quantity the control unit, fuel injection quantity the control unit is used for:
determining an engine exhaust pulse pressure curve, acquiring physical parameters of a deflation valve, and calculating the opening of the deflation valve according to the engine exhaust pulse pressure curve and the physical parameters of the deflation valve;
and calculating the air bleeding amount according to the opening degree of the air bleeding valve, and judging whether the maximum oil injection amount needs to be limited or not by adopting the air bleeding amount.
In this embodiment, the implementation of the fuel injection amount control device is the same as the corresponding content recorded in the scheme shown in fig. 1, and the beneficial effects thereof are also the same, and the detailed content thereof is not repeated.
For example, in an implementation, the fuel injection amount control unit may also be configured to implement the scheme shown in fig. 2, and the specific implementation process is the same as the corresponding content described in the first embodiment.
EXAMPLE III
The embodiment provides an oil injection amount control system, which comprises a controller, wherein the controller is configured with an executable program, and when the executable program runs, any one of the oil injection amount control methods described in the embodiment is realized.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements and substitutions will now be apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (7)

1. A fuel injection amount control method characterized by comprising:
determining an engine exhaust pulse pressure curve, acquiring physical parameters of a deflation valve, and calculating the opening of the deflation valve according to the engine exhaust pulse pressure curve and the physical parameters of the deflation valve;
calculating the air bleeding amount according to the opening degree of the air bleeding valve, and judging whether the maximum oil injection amount needs to be limited or not by adopting the air bleeding amount;
wherein determining the engine exhaust pulse pressure profile comprises:
acquiring an air bleeding pressure measured value, an air bleeding pulse crest coefficient and an air bleeding pulse trough coefficient, and determining a crest parameter of a pressure curve crest and a trough parameter of a pressure curve trough according to the air bleeding pressure measured value, the air bleeding pulse crest coefficient and the air bleeding pulse trough coefficient;
acquiring exhaust valve parameters, and determining a first time length between two adjacent pressure curve peaks and a second time length between two adjacent pressure curve troughs according to the exhaust valve parameters;
adopt the air release volume judges whether need to restrict maximum fuel injection quantity includes:
acquiring altitude measurement data, determining a deflation proportion threshold value corresponding to the altitude measurement data, and limiting the maximum fuel injection quantity if the deflation quantity is smaller than the deflation proportion threshold value;
the physical parameters of the deflation valve comprise:
the air release valve spring stiffness, the air release valve hole area, the air release valve spring pre-tightening force, the air release valve top diaphragm area, the air release valve pressure end force arm, the air release valve turbine end force arm and the air release valve installation angle;
the exhaust valve parameters include: the opening duration of the exhaust valves and the number of the exhaust valves;
the first time length is determined according to the number of the exhaust valves, and the second time length is determined according to the opening duration of the exhaust valves.
2. The fuel injection control method of claim 1, further comprising obtaining an exhaust condition parameter;
calculating the opening of the air release valve according to the engine exhaust pulse pressure curve, the physical parameters of the air release valve and the exhaust working condition parameters;
the exhaust condition parameters comprise: post-press pressure, ambient pressure, post-treatment backpressure.
3. The fuel injection control method of claim 2, wherein determining the aftertreatment backpressure comprises:
obtaining the air input of an engine and the oil injection quantity of the engine, and determining the total flow of the exhaust gas according to the air input of the engine and the oil injection quantity of the engine;
determining the aftertreatment backpressure based on a pressure differential MAP using the total exhaust flow, ambient pressure.
4. A fuel injection amount control method according to claim 3, wherein calculating a purge amount based on the purge valve opening degree comprises:
determining a flow coefficient based on a flow coefficient MAP graph by adopting the opening degree of the air bleed valve;
and calculating the air bleeding amount by adopting the flow coefficient, the post-processing back pressure and the area of the air bleeding valve hole.
5. The fuel injection amount control method of claim 1, wherein obtaining the exhaust pulse crest factor and the exhaust pulse trough factor comprises:
obtaining the rotating speed of an engine and the fuel injection quantity of the engine, and determining the crest factor of the exhaust pulse based on a crest factor MAP graph by adopting the rotating speed of the engine and the fuel injection quantity of the engine;
and determining the trough coefficient of the exhaust pulse based on a trough coefficient MAP graph by adopting the engine speed and the engine fuel injection quantity.
6. The utility model provides an injection quantity controlling means which characterized in that, includes injection quantity control unit, injection quantity control unit is used for:
determining an engine exhaust pulse pressure curve, acquiring physical parameters of a deflation valve, and calculating the opening of the deflation valve according to the engine exhaust pulse pressure curve and the physical parameters of the deflation valve;
calculating the air bleeding amount according to the opening degree of the air bleeding valve, and judging whether the maximum oil injection amount needs to be limited or not by adopting the air bleeding amount;
wherein determining the engine exhaust pulse pressure profile comprises:
acquiring an air discharge pressure measurement value, an air discharge pulse crest coefficient and an air discharge pulse trough coefficient, and determining a crest parameter of a pressure curve crest and a trough parameter of a pressure curve trough according to the air discharge pressure measurement value, the air discharge pulse crest coefficient and the air discharge pulse trough coefficient;
acquiring exhaust valve parameters, and determining a first time length between two adjacent pressure curve peaks and a second time length between two adjacent pressure curve troughs according to the exhaust valve parameters;
adopt the air release volume judges whether need to restrict maximum fuel injection quantity includes:
acquiring altitude measurement data, determining a deflation proportion threshold corresponding to the altitude measurement data, and limiting the maximum fuel injection quantity if the deflation quantity is less than the deflation proportion threshold;
the physical parameters of the deflation valve comprise:
the air release valve spring stiffness, the air release valve hole area, the air release valve spring pre-tightening force, the air release valve top diaphragm area, the air release valve pressure end force arm, the air release valve turbine end force arm and the air release valve installation angle;
the exhaust valve parameters include: the opening duration of the exhaust valves and the number of the exhaust valves;
the first time length is determined according to the number of the exhaust valves, and the second time length is determined according to the opening duration of the exhaust valves.
7. An injection quantity control system, comprising a controller configured with an executable program that when executed implements the injection quantity control method of any of claims 1 to 5.
CN202210507032.5A 2022-05-10 2022-05-10 Fuel injection quantity control method, device and system Active CN114810400B (en)

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