CN113006961A - Fuel control method and system for gasoline engine during VVT (variable valve timing) change - Google Patents

Fuel control method and system for gasoline engine during VVT (variable valve timing) change Download PDF

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CN113006961A
CN113006961A CN202110209375.9A CN202110209375A CN113006961A CN 113006961 A CN113006961 A CN 113006961A CN 202110209375 A CN202110209375 A CN 202110209375A CN 113006961 A CN113006961 A CN 113006961A
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vvt
exhaust
real
angle
fuel
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CN113006961B (en
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胡必柱
张同庆
彭浩
张顺
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Dongfeng Motor Corp
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Dongfeng Motor Corp
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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
    • F02D41/3005—Details not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/04—Engine intake system parameters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/101—Engine speed

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

The invention discloses a fuel control method and a fuel control system for a gasoline engine when VVT changes, wherein the method comprises the following steps: acquiring real-time water temperature of an engine, a real-time opening angle of an intake VVT (variable valve timing) and a real-time closing angle of an exhaust VVT; processing an intake VVT real-time opening angle and an exhaust VVT real-time closing angle according to the real-time water temperature of the engine; and controlling the output fuel injection quantity according to the sum of the fuel compensation value of the opening angle of the intake VVT, the fuel compensation value of the closing angle of the exhaust VVT and a preset basic fuel compensation value. The method for controlling the fuel when the VVT of the gasoline engine changes processes the real-time opening angle of the intake VVT and the real-time closing angle of the exhaust VVT to obtain the fuel compensation value of the opening angle of the intake VVT and the fuel compensation value of the closing angle of the exhaust VVT, and controls the final fuel injection amount according to the fuel compensation value, so that the fuel injection amount when the VVT changes is effectively compensated, the fuel-air mixing in a cylinder is optimized, and the gaseous emission and the generation of particulate matters are controlled.

Description

Fuel control method and system for gasoline engine during VVT (variable valve timing) change
Technical Field
The invention relates to the field of gasoline engine fuel compensation control, in particular to a method and a system for controlling fuel during the VVT change of a gasoline engine.
Background
The national six emission regulations greatly reduce gaseous emissions and particulate matter emissions compared with the previous regulations, and in the national six I type WLTC circulating emission test process, VVT (comprising an inlet VVT and an exhaust VVT) is usually opened in a combustion starting stage, the VVT angle (an inlet VVT opening angle and an exhaust VVT closing angle) is greatly changed, and the VVT angle is also greatly changed along with the change of the engine speed and the engine load after the VVT is opened. Since the intake and exhaust VVT angles directly affect the air-fuel mixture efficiency, if the VVT angle changes sharply, the air-fuel ratio will fluctuate dramatically, especially at low temperature, which directly affects the WLTC cycle gaseous emission and particulate matter emission.
In the prior art, the compensation of the fuel injection amount when the VVT angle is changed is not considered.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provides a method and a system for controlling fuel when the VVT of a gasoline engine changes.
In a first aspect, the invention provides a method for controlling fuel during VVT variation of a gasoline engine, which comprises the following steps:
acquiring real-time water temperature of an engine, a real-time opening angle of an intake VVT (variable valve timing) and a real-time closing angle of an exhaust VVT;
processing the intake VVT real-time opening angle and the exhaust VVT real-time closing angle according to the real-time water temperature of the engine to obtain an intake VVT opening angle fuel compensation value and an exhaust VVT closing angle fuel compensation value;
and controlling the output fuel injection quantity according to the sum of the fuel compensation value of the opening angle of the intake VVT, the fuel compensation value of the closing angle of the exhaust VVT and a preset basic fuel compensation value.
According to the first aspect, in a first possible implementation manner of the first aspect, the step of processing the intake VVT real-time opening angle and the exhaust VVT real-time closing angle according to the real-time water temperature of the engine to obtain the intake VVT opening angle fuel compensation value and the exhaust VVT closing angle fuel compensation value specifically includes the following steps:
acquiring a T filter coefficient according to the real-time water temperature of the engine and a corresponding mapping table of the water temperature of the engine and the T filter coefficient;
according to the acquired T filter coefficient, opening the intake VVT in real timeVVTAir inlet openingAnd an exhaust VVT closing angle VVTExhaust shut-offFiltering to obtain filtered inlet VVT filtering opening angle VVTFilter inlet openingAnd a filtered exhaust VVT filter closing angle VVTFiltered exhaust shutdown；
Obtaining a difference value of an intake VVT real-time opening angle and a VVT filtering opening angle to obtain an intake VVT opening angle difference value;
obtaining a difference value of the real-time closing angle of the exhaust VVT and the closing angle of the VVT filtering to obtain a difference value of the closing angle of the exhaust VVT;
and carrying out parameter correction on the difference value of the opening angle of the intake VVT and the difference value of the closing angle of the exhaust VVT to obtain a fuel compensation value of the opening angle of the intake VVT and a fuel compensation value of the closing angle of the exhaust VVT.
According to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the step of performing parameter correction on the intake VVT opening angle difference and the exhaust VVT closing angle difference to obtain the intake VVT opening angle fuel compensation value and the exhaust VVT closing angle fuel compensation value further includes the following steps:
acquiring a water temperature correction coefficient corresponding to the real-time water temperature of the engine according to the real-time water temperature of the engine and a corresponding second mapping table of the real-time water temperature of the engine and the water temperature correction coefficient;
and respectively carrying out parameter correction on the intake VVT opening angle difference and the exhaust VVT closing angle difference according to the obtained water temperature correction coefficient to obtain an intake VVT opening angle fuel compensation value and an exhaust VVT closing angle fuel compensation value.
According to a second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the step of "performing parameter correction on the intake VVT opening angle difference and the exhaust VVT closing angle difference respectively according to the obtained water temperature correction coefficient to obtain the intake VVT opening angle fuel compensation value and the exhaust VVT closing angle fuel compensation value" specifically includes the following steps:
according to the obtained water temperature correction coefficient, performing first parameter correction on the intake VVT opening angle difference and the exhaust VVT closing angle difference respectively to obtain a first intake VVT opening angle fuel correction value and a first exhaust VVT closing angle fuel correction value;
acquiring real-time rotating speed and real-time load of an engine, acquiring a third mapping table corresponding to the rotating speed, the load of the engine and the rotating speed load correction coefficient, and acquiring the rotating speed load correction coefficient corresponding to the real-time rotating speed and the real-time load of the engine;
and respectively carrying out second parameter correction on the difference value of the opening angle of the intake VVT and the difference value of the closing angle of the exhaust VVT according to the speed load correction coefficient to obtain a second correction value of the fuel at the opening angle of the intake VVT and a second correction value of the fuel at the closing angle of the exhaust VVT, setting the second correction value of the fuel at the opening angle of the intake VVT as a fuel compensation value at the opening angle of the intake VVT, and setting the second correction value of the fuel at the closing angle of the exhaust VVT as a fuel compensation value at the closing angle of the exhaust VVT.
According to the first possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the step of performing parameter correction on the intake VVT opening angle difference and the exhaust VVT closing angle difference to obtain the intake VVT opening angle fuel compensation value and the exhaust VVT closing angle fuel compensation value specifically includes the following steps:
acquiring real-time rotating speed and real-time load of an engine, acquiring a third mapping table corresponding to the rotating speed, the load of the engine and the rotating speed load correction coefficient, and acquiring the rotating speed load correction coefficient corresponding to the real-time rotating speed and the real-time load of the engine;
and respectively carrying out primary parameter correction on the difference value of the opening angle of the intake VVT and the difference value of the closing angle of the exhaust VVT according to the speed load correction coefficient to obtain a primary correction value of the fuel of the opening angle of the intake VVT and a primary correction value of the fuel of the closing angle of the exhaust VVT, setting the primary correction value of the fuel of the opening angle of the intake VVT as a fuel compensation value of the opening angle of the intake VVT, and setting the primary correction value of the fuel of the closing angle of the exhaust VVT as a fuel compensation value of the closing angle of the.
According to a first possible implementation manner of the first aspect, in a fifth implementation manner of the first aspectIn a possible implementation manner, the step of opening the intake VVT in real time according to the acquired T filter coefficientAir inlet openingAnd an exhaust VVT closing angle VVTExhaust shut-offFiltering to obtain filtered inlet VVT filtering opening angle VVTFilter inlet openingAnd a filtered exhaust VVT filter closing angle VVTFiltered exhaust shutdownThe method specifically comprises the following steps:
according to the obtained T filter coefficient, filtering the intake VVT real-time opening angle according to the formula (1) to obtain a filtered intake VVT filtering opening angle:
VVTfilter inlet opening＝VVTAir inlet opening+(VVTTarget angle value－VVTAir inlet opening) dt/T formula (1);
where dt is the calculated frequency, VVTTarget angle valueSetting a preset VVT angle target value;
according to the obtained T filter coefficient, carrying out filtering processing on the real-time opening angle of the exhaust VVT according to the formula (2) to obtain a filtered filter opening angle of the intake VVT:
VVTfiltered exhaust shutdown＝VVTExhaust shut-off+(VVTTarget angle value－VVTExhaust shut-off) dt/T formula (2);
where dt is the calculated frequency, VVTTarget angle valueIs a preset VVT angle target value.
In a second aspect, the present invention provides a fuel control system for a gasoline engine with variable VVT, comprising:
the first acquisition module is used for acquiring the real-time water temperature of an engine, the real-time opening angle of an intake VVT and the real-time closing angle of an exhaust VVT;
the parameter conversion and correction module is in communication connection with the first acquisition module and is used for processing the intake VVT real-time opening angle and the exhaust VVT real-time closing angle according to the real-time water temperature of the engine to obtain an intake VVT opening angle fuel compensation value and an exhaust VVT closing angle fuel compensation value;
and the control module is in communication connection with the parameter conversion and correction module and is used for controlling the output fuel injection amount according to the sum of the fuel compensation value of the opening angle of the intake VVT, the fuel compensation value of the closing angle of the exhaust VVT and a preset basic fuel compensation value.
According to the second aspect, in a first possible implementation manner of the second aspect, the parameter conversion and correction module includes:
the filter parameter acquisition unit is used for acquiring a T filter coefficient according to the real-time water temperature of the engine and a corresponding mapping table of the water temperature of the engine and the T filter coefficient;
the filtering unit is in communication connection with the filtering parameter acquisition unit and the first acquisition module and is used for carrying out filtering processing on the real-time opening angle of the intake VVT and the closing angle of the exhaust VVT according to the acquired T filtering coefficient to obtain a filtered intake VVT filtering opening angle and a filtered exhaust VVT filtering closing angle;
the parameter conversion unit is in communication connection with the filtering unit and is used for obtaining a difference value between an intake VVT real-time opening angle and a VVT filtering opening angle to obtain an intake VVT opening angle difference value and a difference value between an exhaust VVT real-time closing angle and a VVT filtering closing angle to obtain an exhaust VVT closing angle difference value;
and the parameter correction unit is in communication connection with the parameter conversion unit and is used for performing parameter correction on the intake VVT opening angle difference and the exhaust VVT closing angle difference to obtain an intake VVT opening angle fuel compensation value and an exhaust VVT closing angle fuel compensation value.
In a first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the parameter modification unit includes:
the first obtaining subunit is used for obtaining a water temperature correction coefficient corresponding to the real-time water temperature of the engine according to the real-time water temperature of the engine and a corresponding second mapping table of the real-time water temperature of the engine and the water temperature correction coefficient;
and the first correction subunit is in communication connection with the first acquisition subunit and is used for respectively performing parameter correction on the intake VVT opening angle difference and the exhaust VVT closing angle difference according to the obtained water temperature correction coefficient to obtain an intake VVT opening angle fuel compensation value and an exhaust VVT closing angle fuel compensation value.
According to a first possible implementation form of the second aspect, in a second possible implementation form of the second aspect,
the parameter correction unit further includes:
the second obtaining subunit is used for obtaining the real-time rotating speed and the real-time load of the engine, obtaining a third mapping table corresponding to the rotating speed, the engine load and the rotating speed load correction coefficient, and obtaining the rotating speed load correction coefficient corresponding to the real-time rotating speed and the real-time load of the engine;
and the second correction subunit is in communication connection with the second acquisition subunit and is used for respectively performing second parameter correction on the intake VVT opening angle difference and the exhaust VVT closing angle difference according to the rotating speed load correction coefficient to obtain an intake VVT opening angle fuel second correction value and an exhaust VVT closing angle fuel second correction value, setting the intake VVT opening angle fuel second correction value as an intake VVT opening angle fuel compensation value, and setting the exhaust VVT closing angle fuel second correction value as an exhaust VVT closing angle fuel compensation value.
Compared with the prior art, the invention has the following advantages:
the invention provides a fuel oil compensation method for a fuel oil engine when a Variable Valve Timing (VVT) angle changes, which is used for processing an intake VVT real-time opening angle and an exhaust VVT real-time closing angle according to the real-time water temperature of an engine to obtain an intake VVT opening angle fuel oil compensation value and an exhaust VVT closing angle fuel oil compensation value and controlling the final fuel oil injection amount to be the sum of the intake VVT opening angle fuel oil compensation value, the exhaust VVT closing angle fuel oil compensation value and a preset basic fuel oil compensation value.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is another method flow diagram of an embodiment of the present invention;
FIG. 3 is a functional block diagram of an embodiment of the present invention;
FIG. 4 is a block diagram of another functional block of an embodiment of the present invention;
fig. 5 is another functional block diagram of an embodiment of the present invention.
In the figure, 100, a first obtaining module; 200. a parameter conversion and correction module; 210. a filtering parameter acquisition unit; 220. a filtering unit; 230. a parameter conversion unit; 240. a parameter correction unit; 2411. a first acquisition subunit; 2412. a first correction subunit; 2421. a second acquisition subunit; 2422. a second correction subunit; 300. and a control module.
Detailed Description
Reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings. While the invention will be described in conjunction with the specific embodiments, it will be understood that they are not intended to limit the invention to the embodiments described. On the contrary, it is intended to cover alternatives, modifications, and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims. It should be noted that the method steps described herein may be implemented by any functional block or functional arrangement, and that any functional block or functional arrangement may be implemented as a physical entity or a logical entity, or a combination of both.
In order that those skilled in the art will better understand the present invention, the following detailed description of the invention is provided in conjunction with the accompanying drawings and the detailed description of the invention.
Note that: the example to be described next is only a specific example, and does not limit the embodiments of the present invention necessarily to the following specific steps, values, conditions, data, orders, and the like. Those skilled in the art can, upon reading this specification, utilize the concepts of the present invention to construct more embodiments than those specifically described herein.
Referring to fig. 1, an embodiment of the present invention provides a method for controlling fuel during VVT change of a gasoline engine, including the following steps:
s100, acquiring real-time water temperature of an engine, real-time opening angle of an intake VVT and real-time closing angle of an exhaust VVT;
s200, processing an intake VVT real-time opening angle and an exhaust VVT real-time closing angle according to the real-time water temperature of the engine to obtain an intake VVT opening angle fuel compensation value and an exhaust VVT closing angle fuel compensation value;
and S300, controlling and outputting the fuel injection quantity according to the sum of the fuel compensation value of the opening angle of the intake VVT, the fuel compensation value of the closing angle of the exhaust VVT and a preset basic fuel compensation value.
The invention provides a fuel oil compensation method for a fuel oil engine when a Variable Valve Timing (VVT) angle changes, which is used for processing an intake VVT real-time opening angle and an exhaust VVT real-time closing angle according to the real-time water temperature of an engine to obtain an intake VVT opening angle fuel oil compensation value and an exhaust VVT closing angle fuel oil compensation value and controlling the final fuel oil injection amount to be the sum of the intake VVT opening angle fuel oil compensation value, the exhaust VVT closing angle fuel oil compensation value and a preset basic fuel oil compensation value.
In an embodiment, referring to fig. 2, the step of processing the real-time opening angle of the intake VVT and the real-time closing angle of the exhaust VVT according to the real-time water temperature of the engine to obtain the fuel compensation value of the opening angle of the intake VVT and the fuel compensation value of the closing angle of the exhaust VVT includes the following steps:
s210, acquiring a T filter coefficient according to the real-time water temperature of the engine and a corresponding first mapping table of the water temperature of the engine and the T filter coefficient, as shown in a table 1;
TABLE 1 mapping table corresponding to engine water temperature and T filter coefficient
Engine water temperature (DEG C) -30 -20 -10 0 10 20 30 40 50 60 70 80 90
Coefficient of T-filter 1.4 1.3 1.2 1.1 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2
S220, opening the intake VVT at the angle VVT in real time according to the acquired T filter coefficientAir inlet openingAnd an exhaust VVT closing angle VVTExhaust shut-offFiltering to obtain filtered inlet VVT filtering opening angle VVTFilter inlet openingAnd a filtered exhaust VVT filter closing angle VVTFiltered exhaust shutdown；
S230, opening angle VVT in real time for intake VVTAir inlet openingAnd VVT filter opening angle VVTFilter inlet openingObtaining a difference value to obtain an intake VVT opening angle difference value VVTDifference of intake opening：
VVTDifference of intake opening＝VVTAir inlet opening-VVTOpening the filtering air inlet;
closing angle VVT in real time for exhaust VVTExhaust shut-offAnd VVT filter closing angle VVTFiltered exhaust shutdownObtaining a difference value to obtain an exhaust VVT closing angle difference value VVTExhaust closure difference：
VVTExhaust closure difference＝VVTExhaust shut-off-VVTThe filtering exhaust is closed;
s240, carrying out parameter correction on the difference value of the opening angle of the intake VVT and the difference value of the closing angle of the exhaust VVT to obtain a fuel compensation value of the opening angle of the intake VVT and a fuel compensation value of the closing angle of the exhaust VVT.
In one embodiment, the step of performing parameter correction on the difference between the opening angle of the intake VVT and the closing angle of the exhaust VVT to obtain the fuel compensation value for the opening angle of the intake VVT and the fuel compensation value for the closing angle of the exhaust VVT further includes the following steps:
according to the real-time water temperature of the engine and a second mapping table corresponding to the real-time water temperature of the engine and the water temperature correction coefficient, referring to table 2, the water temperature correction coefficient corresponding to the real-time water temperature of the engine is obtained;
TABLE 2 mapping table of engine water temperature and water temperature correction coefficient
Engine water temperature (DEG C) -30 -20 -10 0 10 20 30 40 50 60 70 80 90
Water temperature correction factor 3 2.5 2.3 2 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1
As shown in table two, the water temperature correction coefficient value decreases as the water temperature increases, and the engine temperature greatly affects the fluctuation of the air-fuel ratio when VVT changes.
According to the obtained water temperature correction coefficient, opening the intake VVT by the angle difference VVTDifference of intake openingAnd an exhaust VVT closing angle difference VVTExhaust closure differenceRespectively correcting parameters to obtain an intake VVT opening angle fuel compensation value VVTCompensation value of air admissionAnd exhaust VVT closing angle fuel oil compensation value VVTExhaust compensation value：
VVTCompensation value of air admissionVVT (water temperature correction coefficient)Difference of intake opening，
VVTExhaust compensation valueVVT (water temperature correction coefficient)Exhaust closure difference，
Fuel injection quantity VVTCompensation value of air admission+VVTExhaust compensation value+VVTBase value；
Wherein, VVTBase valueThe method is a basic fuel compensation value provided for presetting a basic fuel compensation value and for the prior art without considering the influence of VVT variation factors on WLTC circulation gaseous emission and particulate matter emission.
In one embodiment, the step of opening the intake VVT by the angle difference VVT according to the obtained water temperature correction coefficientDifference of intake openingAnd an exhaust VVT closing angle difference VVTExhaust closure differenceRespectively correcting parameters to obtain an intake VVT opening angle fuel compensation value VVTCompensation value of air admissionAnd exhaust VVT closing angle fuel oil compensation value VVTExhaust compensation valueThe method specifically comprises the following steps:
according to the obtained water temperature correction coefficient, opening the intake VVT by the angle difference VVTDifference of intake openingAnd an exhaust VVT closing angle difference VVTExhaust closure differenceRespectively carrying out first parameter correction to obtain a first correction value VVT of the opening angle of the intake VVTFirst correction value of intake airAnd a first correction value VVT of the closing angle of the exhaust VVTFirst correction value of exhaust：
VVTFirst correction value of intake airVVT (water temperature correction coefficient)Difference of intake opening，
VVTFirst correction value of exhaustVVT (water temperature correction coefficient)Exhaust closure difference；
Acquiring real-time rotating speed and real-time load of an engine, acquiring a third mapping table corresponding to the rotating speed, the load of the engine and the rotating speed load correction coefficient, and acquiring the rotating speed load correction coefficient corresponding to the real-time rotating speed and the real-time load of the engine as shown in a table 3; TABLE 3 mapping table corresponding to engine speed, engine load and speed load correction coefficient
Figure BDA0002950848200000111
When the VVT changes, an engine speed load correction coefficient is provided, the coefficient is determined according to a table look-up 3, the coefficient can be used for quickly adjusting a VVT target value on a calibration rotating hub by fixing the engine speed and the load and then modifying corresponding ECU data, so that the VVT value is quickly changed along with the VVT target value, and the optimal value of the engine speed load correction coefficient under the conditions of the speed and the load is determined according to the air-fuel ratio performance of the engine. In general, the higher the rotation speed, the larger the rotation speed load correction coefficient; the larger the load, the larger the rotational speed load correction factor.
According to the speed load correction coefficient, respectively carrying out second parameter correction on the intake VVT opening angle difference and the exhaust VVT closing angle difference to obtain intakeSetting a second fuel correction value VT of the intake VVT opening angle and a second fuel correction value VT of the exhaust VVT closing angleSecond correction value of intake airFuel oil compensation value VVT for intake VVT opening angleCompensation value of air admissionAnd setting a secondary fuel correction value VT of the exhaust VVT closing angleSecond correction value of exhaust gasFuel oil compensation value VVT for exhaust VVT closing angleExhaust compensation value：
VVTCompensation value of air admission＝VTSecond correction value of intake airVVT (rotational speed load correction factor)First correction value of intake air，
VVTExhaust compensation value＝VTSecond correction value of exhaust gasVVT (rotational speed load correction factor)Second correction value of exhaust gas，
Fuel injection quantity VVTCompensation value of air admission+VVTExhaust compensation value+VVTBase value，
Wherein, VVTBase valueThe base fuel compensation value is preset.
According to the real-time water temperature of the engine, the VVT is adjustedDifference of intake openingAnd VVTExhaust closure differencePerforming first parameter correction, and performing first correction on VVT according to engine speed and engine loadDifference of intake openingAnd VVTExhaust closure differenceAnd performing second parameter correction, namely setting the secondary correction value of the intake VVT opening angle fuel related to the real-time water temperature of the engine, the rotating speed of the engine and the load after two parameter corrections as an intake VVT opening angle fuel compensation value, and setting the secondary correction value of the exhaust VVT closing angle fuel as an exhaust VVT closing angle fuel compensation value.
In one embodiment, the step of performing parameter correction on the difference between the opening angle of the intake VVT and the closing angle of the exhaust VVT to obtain the fuel compensation value for the opening angle of the intake VVT and the fuel compensation value for the closing angle of the exhaust VVT includes the following steps:
acquiring real-time rotating speed and real-time load of an engine, acquiring a third mapping table corresponding to the rotating speed, the load of the engine and the rotating speed load correction coefficient, and acquiring the rotating speed load correction coefficient corresponding to the real-time rotating speed and the real-time load of the engine;
according to the speed load correction coefficient, the intake VVT opening angle difference and the exhaust VVT closing angle difference are subjected to primary parameter correction respectively to obtain a primary intake VVT opening angle fuel correction value VVTFirst correction value of intake airAnd one-time fuel correction value VVT of exhaust VVT closing angleFirst correction value of exhaustSetting a primary correction value VVT of the opening angle of the intake VVTFirst correction value of intake airFuel oil compensation value VVT for intake VVT opening angleCompensation value of air admissionAnd setting a primary fuel correction value VVT of the exhaust VVT closing angleFirst correction value of exhaustFuel compensation value VT for exhaust VVT closing angleExhaust compensation value：
VVTCompensation value of air admission＝VVTFirst correction value of intake airVVT (rotational speed load correction factor)Difference of intake opening，
VTExhaust compensation value＝VVTFirst correction value of exhaustVVT (rotational speed load correction factor)Exhaust closure difference，
Fuel injection quantity VVTCompensation value of air admission+VVTExhaust compensation value+VVTBase value，
Wherein, VVTBase valueThe base fuel compensation value is preset.
VVTDifference of intake openingAnd VVTExhaust closure differenceThe final fuel injection quantity is related to the engine speed and the engine load, and the fuel injection quantity when the VVT changes is effectively compensated.
In one embodiment, the step of opening the intake VVT in real time according to the acquired T filter coefficientAir inlet openingAnd an exhaust VVT closing angle VVTExhaust shut-offFiltering to obtain filtered inlet VVT filtering opening angle VVTFilter inlet openingAnd a filtered exhaust VVT filter closing angle VVTFiltered exhaust shutdownThe method specifically comprises the following steps:
according to the obtained T filter coefficient, filtering the intake VVT real-time opening angle according to the formula (1) to obtain a filtered intake VVT filtering opening angle:
VVTfilter inlet opening＝VVTAir inlet opening+(VVTTarget angle value－VVTAir inlet opening) dt/T formula (1);
where dt is the calculated frequency, VVTTarget angle valueSetting a preset VVT angle target value;
according to the obtained T filter coefficient, carrying out filtering processing on the real-time opening angle of the exhaust VVT according to the formula (2) to obtain a filtered filter opening angle of the intake VVT:
VVTfiltered exhaust shutdown＝VVTExhaust shut-off+(VVTTarget angle value－VVTExhaust shut-off) dt/T formula (2);
where dt is the calculated frequency, VVTTarget angle valueIs a preset VVT angle target value.
Based on the same inventive concept, referring to fig. 3, the present invention provides a fuel control system for a gasoline engine when VVT changes, comprising:
the first obtaining module 100 is used for obtaining real-time water temperature of an engine, a real-time opening angle of an intake VVT and a real-time closing angle of an exhaust VVT;
the parameter conversion and correction module 200 is in communication connection with the first acquisition module and is used for processing the intake VVT real-time opening angle and the exhaust VVT real-time closing angle according to the real-time water temperature of the engine to obtain an intake VVT opening angle fuel compensation value and an exhaust VVT closing angle fuel compensation value;
and the control module 300 is in communication connection with the parameter conversion and correction module and is used for controlling the output fuel injection amount according to the sum of the fuel compensation value of the opening angle of the intake VVT, the fuel compensation value of the closing angle of the exhaust VVT and a preset basic fuel compensation value.
In an embodiment, referring to fig. 4, the parameter conversion and correction module includes:
a filter parameter obtaining unit 210, configured to obtain a T filter coefficient according to a real-time engine water temperature and a mapping table of the engine water temperature and the T filter coefficient, as shown in table 1;
the filtering unit 220 is in communication connection with the filtering parameter obtaining unit and the first obtaining module, and is configured to perform filtering processing on the intake VVT real-time opening angle and the exhaust VVT closing angle according to the obtained T filter coefficient to obtain a filtered intake VVT filtering opening angle and a filtered exhaust VVT filtering closing angle;
a parameter conversion unit 230, communicatively connected to the filtering unit, for converting the intake VVT
Obtaining a difference value between a real-time opening angle and a VVT filtering opening angle to obtain an intake VVT opening angle difference value, and obtaining a difference value between an exhaust VVT real-time closing angle and a VVT filtering closing angle to obtain an exhaust VVT closing angle difference value;
and the parameter correcting unit 240 is in communication connection with the parameter converting unit and is used for performing parameter correction on the intake VVT opening angle difference and the exhaust VVT closing angle difference to obtain an intake VVT opening angle fuel compensation value and an exhaust VVT closing angle fuel compensation value.
In an embodiment, referring to fig. 5, the parameter modification unit includes:
a first obtaining subunit 2411, configured to obtain, according to the real-time engine water temperature and a second mapping table corresponding to the real-time engine water temperature and the water temperature correction coefficient, as shown in table 2, a water temperature correction coefficient corresponding to the real-time engine water temperature;
and a first correcting subunit 2412, which is in communication connection with the first obtaining subunit, and configured to perform parameter correction on the intake VVT opening angle difference and the exhaust VVT closing angle difference respectively according to the obtained water temperature correction coefficient, so as to obtain an intake VVT opening angle fuel compensation value and an exhaust VVT closing angle fuel compensation value.
In an embodiment, referring to fig. 5, the parameter modification unit further includes:
a second obtaining subunit 2421, configured to obtain a real-time engine speed and a real-time engine load, and obtain a third mapping table corresponding to the engine speed, the engine load, and the rotational speed load correction coefficient, as shown in table 3, to obtain a rotational speed load correction coefficient corresponding to the real-time engine speed and the real-time engine load;
and a second correcting subunit 2422, which is communicatively connected to the second obtaining subunit and the first correcting subunit, and configured to perform second parameter correction on the intake VVT opening angle difference and the exhaust VVT closing angle difference respectively according to the rotational speed load correction coefficient to obtain an intake VVT opening angle fuel second correction value and an exhaust VVT closing angle fuel second correction value, set the intake VVT opening angle fuel second correction value as an intake VVT opening angle fuel compensation value, and set the exhaust VVT closing angle fuel second correction value as an exhaust VVT closing angle fuel compensation value.
Based on the same inventive concept, the embodiments of the present application further provide a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements all or part of the method steps of the above method.
The present invention can implement all or part of the processes of the above methods, and can also be implemented by using a computer program to instruct related hardware, where the computer program can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the above method embodiments can be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, in accordance with legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunications signals.
Based on the same inventive concept, an embodiment of the present application further provides an electronic device, which includes a memory and a processor, where the memory stores a computer program running on the processor, and the processor executes the computer program to implement all or part of the method steps in the method.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, the processor being the control center of the computer device and the various interfaces and lines connecting the various parts of the overall computer device.
The memory may be used to store computer programs and/or modules, and the processor may implement various functions of the computer device by executing or executing the computer programs and/or modules stored in the memory, as well as by invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (e.g., a sound playing function, an image playing function, etc.); the storage data area may store data (e.g., audio data, video data, etc.) created according to the use of the cellular phone. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, server, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), servers and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A fuel control method for a gasoline engine when VVT changes is characterized by comprising the following steps:
acquiring real-time water temperature of an engine, a real-time opening angle of an intake VVT (variable valve timing) and a real-time closing angle of an exhaust VVT;
processing the intake VVT real-time opening angle and the exhaust VVT real-time closing angle according to the real-time water temperature of the engine to obtain an intake VVT opening angle fuel compensation value and an exhaust VVT closing angle fuel compensation value;
and controlling the output fuel injection quantity according to the sum of the fuel compensation value of the opening angle of the intake VVT, the fuel compensation value of the closing angle of the exhaust VVT and a preset basic fuel compensation value.
2. The method for controlling fuel during VVT change of a gasoline engine as claimed in claim 1, wherein said step of processing the real-time opening angle of the intake VVT and the real-time closing angle of the exhaust VVT according to the real-time water temperature of the engine to obtain the fuel compensation value for the opening angle of the intake VVT and the fuel compensation value for the closing angle of the exhaust VVT includes the steps of:
acquiring a T filter coefficient according to the real-time water temperature of the engine and a first corresponding mapping table of the water temperature of the engine and the T filter coefficient;
according to the acquired T filter coefficient, opening the intake VVT at an angle VVT in real timeAir inlet openingAnd an exhaust VVT closing angle VVTExhaust shut-offFiltering to obtain filtered inlet VVT filtering opening angle VVTFilter inlet openingAnd a filtered exhaust VVT filter closing angle VVTFiltered exhaust shutdown；
Obtaining a difference value of an intake VVT real-time opening angle and a VVT filtering opening angle to obtain an intake VVT opening angle difference value;
obtaining a difference value of the real-time closing angle of the exhaust VVT and the closing angle of the VVT filtering to obtain a difference value of the closing angle of the exhaust VVT;
and carrying out parameter correction on the difference value of the opening angle of the intake VVT and the difference value of the closing angle of the exhaust VVT to obtain a fuel compensation value of the opening angle of the intake VVT and a fuel compensation value of the closing angle of the exhaust VVT.
3. The method for controlling fuel during VVT change of a gasoline engine as claimed in claim 2, wherein said step of "performing parameter correction on the difference between the opening angle of the intake VVT and the closing angle of the exhaust VVT to obtain the fuel compensation value for the opening angle of the intake VVT and the fuel compensation value for the closing angle of the exhaust VVT" further comprises the steps of:
acquiring a water temperature correction coefficient corresponding to the real-time water temperature of the engine according to the real-time water temperature of the engine and a corresponding second mapping table of the real-time water temperature of the engine and the water temperature correction coefficient;
and respectively carrying out parameter correction on the intake VVT opening angle difference and the exhaust VVT closing angle difference according to the obtained water temperature correction coefficient to obtain an intake VVT opening angle fuel compensation value and an exhaust VVT closing angle fuel compensation value.
4. The method for controlling fuel during VVT change of a gasoline engine as claimed in claim 3, wherein said step of "obtaining the fuel compensation value for the opening angle of the intake VVT and the fuel compensation value for the closing angle of the exhaust VVT by respectively performing parameter corrections on the difference between the opening angle of the intake VVT and the difference between the closing angle of the exhaust VVT based on the obtained correction coefficient for the water temperature" includes the steps of:
according to the obtained water temperature correction coefficient, performing first parameter correction on the intake VVT opening angle difference and the exhaust VVT closing angle difference respectively to obtain a first intake VVT opening angle fuel correction value and a first exhaust VVT closing angle fuel correction value;
acquiring real-time rotating speed and real-time load of an engine, acquiring a third mapping table corresponding to the rotating speed, the load of the engine and the rotating speed load correction coefficient, and acquiring the rotating speed load correction coefficient corresponding to the real-time rotating speed and the real-time load of the engine;
and respectively carrying out second parameter correction on the difference value of the opening angle of the intake VVT and the difference value of the closing angle of the exhaust VVT according to the speed load correction coefficient to obtain a second correction value of the fuel at the opening angle of the intake VVT and a second correction value of the fuel at the closing angle of the exhaust VVT, setting the second correction value of the fuel at the opening angle of the intake VVT as a fuel compensation value at the opening angle of the intake VVT, and setting the second correction value of the fuel at the closing angle of the exhaust VVT as a fuel compensation value at the closing angle of the exhaust VVT.
5. The method for controlling fuel during VVT change of a gasoline engine as claimed in claim 2, wherein said step of "performing parameter correction on the difference between the opening angle of the intake VVT and the closing angle of the exhaust VVT to obtain the fuel compensation value for the opening angle of the intake VVT and the fuel compensation value for the closing angle of the exhaust VVT" includes the steps of:
acquiring real-time rotating speed and real-time load of an engine, acquiring a third mapping table corresponding to the rotating speed, the load of the engine and the rotating speed load correction coefficient, and acquiring the rotating speed load correction coefficient corresponding to the real-time rotating speed and the real-time load of the engine;
and respectively carrying out primary parameter correction on the difference value of the opening angle of the intake VVT and the difference value of the closing angle of the exhaust VVT according to the speed load correction coefficient to obtain a primary correction value of the fuel of the opening angle of the intake VVT and a primary correction value of the fuel of the closing angle of the exhaust VVT, setting the primary correction value of the fuel of the opening angle of the intake VVT as a fuel compensation value of the opening angle of the intake VVT, and setting the primary correction value of the fuel of the closing angle of the exhaust VVT as a fuel compensation value of the closing angle of the.
6. The method for controlling fuel during VVT change of a gasoline engine as claimed in claim 2, wherein said step of "opening the intake VVT in real time by the opening angle VVT based on the acquired T filter coefficientAir inlet openingAnd an exhaust VVT closing angle VVTExhaust shut-offFiltering to obtain filtered inlet VVT filtering opening angle VVTFilter inlet openingAnd a filtered exhaust VVT filter closing angle VVTFiltered exhaust shutdownThe method specifically comprises the following steps:
according to the obtained T filter coefficient, filtering the intake VVT real-time opening angle according to the formula (1) to obtain a filtered intake VVT filtering opening angle:
VVTfilter inlet opening＝VVTAir inlet opening+(VVTTarget angle value－VVTAir inlet opening) dt/T formula (1);
where dt is the calculated frequency, VVTTarget angle valueSetting a preset VVT angle target value;
according to the obtained T filter coefficient, carrying out filtering processing on the real-time opening angle of the exhaust VVT according to the formula (2) to obtain a filtered filter opening angle of the intake VVT:
VVTfiltered exhaust shutdown＝VVTExhaust shut-off+(VVTTarget angle value－VVTExhaust shut-off) dt/T formula (2);
where dt is the calculated frequency, VVTTarget angle valueIs a preset VVT angle target value.
7. A fuel control system when the VVT of a gasoline engine is changed is characterized by comprising:
the first acquisition module is used for acquiring the real-time water temperature of an engine, the real-time opening angle of an intake VVT and the real-time closing angle of an exhaust VVT;
the parameter conversion and correction module is in communication connection with the first acquisition module and is used for processing the intake VVT real-time opening angle and the exhaust VVT real-time closing angle according to the real-time water temperature of the engine to obtain an intake VVT opening angle fuel compensation value and an exhaust VVT closing angle fuel compensation value;
and the control module is in communication connection with the parameter conversion and correction module and is used for controlling the output fuel injection amount according to the sum of the fuel compensation value of the opening angle of the intake VVT, the fuel compensation value of the closing angle of the exhaust VVT and a preset basic fuel compensation value.
8. The gasoline engine VVT change fuel control system of claim 7, wherein the parameter conversion correction module comprises:
the filtering parameter obtaining unit is used for obtaining a T filtering coefficient according to the real-time water temperature of the engine and a first mapping table corresponding to the water temperature of the engine and the T filtering coefficient;
the filtering unit is in communication connection with the filtering parameter acquisition unit and the first acquisition module and is used for carrying out filtering processing on the real-time opening angle of the intake VVT and the closing angle of the exhaust VVT according to the acquired T filtering coefficient to obtain a filtered intake VVT filtering opening angle and a filtered exhaust VVT filtering closing angle;
the parameter conversion unit is in communication connection with the filtering unit and is used for obtaining a difference value between an intake VVT real-time opening angle and a VVT filtering opening angle to obtain an intake VVT opening angle difference value and a difference value between an exhaust VVT real-time closing angle and a VVT filtering closing angle to obtain an exhaust VVT closing angle difference value;
and the parameter correction unit is in communication connection with the parameter conversion unit and is used for performing parameter correction on the intake VVT opening angle difference and the exhaust VVT closing angle difference to obtain an intake VVT opening angle fuel compensation value and an exhaust VVT closing angle fuel compensation value.
9. The gasoline engine VVT-time fuel control system according to claim 8, wherein the parameter correction unit includes:
the first obtaining subunit is used for obtaining a water temperature correction coefficient corresponding to the real-time water temperature of the engine according to the real-time water temperature of the engine and a corresponding second mapping table of the real-time water temperature of the engine and the water temperature correction coefficient;
and the first correction subunit is in communication connection with the first acquisition subunit and is used for respectively performing parameter correction on the intake VVT opening angle difference and the exhaust VVT closing angle difference according to the obtained water temperature correction coefficient to obtain an intake VVT opening angle fuel compensation value and an exhaust VVT closing angle fuel compensation value.
10. The gasoline engine VVT-time fuel control system according to claim 9, wherein the parameter correction unit further comprises:
the second obtaining subunit is used for obtaining the real-time rotating speed and the real-time load of the engine, obtaining a third mapping table corresponding to the rotating speed, the engine load and the rotating speed load correction coefficient, and obtaining the rotating speed load correction coefficient corresponding to the real-time rotating speed and the real-time load of the engine;
and the second correction subunit is in communication connection with the second acquisition subunit and is used for respectively performing second parameter correction on the intake VVT opening angle difference and the exhaust VVT closing angle difference according to the rotating speed load correction coefficient to obtain an intake VVT opening angle fuel second correction value and an exhaust VVT closing angle fuel second correction value, setting the intake VVT opening angle fuel second correction value as an intake VVT opening angle fuel compensation value, and setting the exhaust VVT closing angle fuel second correction value as an exhaust VVT closing angle fuel compensation value.
CN202110209375.9A 2021-02-24 2021-02-24 Fuel control method and system for gasoline engine during VVT (variable valve timing) change Active CN113006961B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0404060A2 (en) * 1989-06-20 1990-12-27 WEBER S.r.l. An electronic fuel injection system for internal combustion engines, with self-adjusting flow rate strategy
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