CN106150737B - A kind of multi-injection oil mass compensation method and device - Google Patents
A kind of multi-injection oil mass compensation method and device Download PDFInfo
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- CN106150737B CN106150737B CN201510206576.8A CN201510206576A CN106150737B CN 106150737 B CN106150737 B CN 106150737B CN 201510206576 A CN201510206576 A CN 201510206576A CN 106150737 B CN106150737 B CN 106150737B
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Abstract
The present invention provides a kind of multi-injection oil mass compensation method and devices, when can solve engine operation under the injection mode repeatedly sprayed (more than twice), use the biggish problem of oil mass difference caused by existing oil mass oscillation compensation model compensation, each injection oil mass in engine operational cycle can be accurately compensated for, so that the target value that actual ejection oil mass gives close to ECU, to guarantee the stability of engine torque output and the emission performance of engine.The described method includes: determining the first amendment oil mass that i-th injection sprays the i-th+2 times and the second amendment oil mass that i+1 time injection sprays described the i-th+2 times, wherein, i takes 1 to all integers between N-2, and N is the injecting times of fuel injector in engine one action recycles；It is compensated according to the first amendment oil mass and the second amendment oil mass, the target oil mass sprayed described the i-th+2 times.The present invention is suitable for technical field of engine control.
Description
Technical field
The present invention relates to technical field of engine control, in particular to a kind of multi-injection oil mass compensation method and device.
Background technique
Currently, in order to reduce the particle (Particulate Matter, PM) and oxynitrides of engine emission
(NOx), the injection mode of multi-injection is introduced, i.e., will spray into the fuel oil of combustion chamber in the one action circulation of engine,
It is divided into twice or multi-injection from primary injection.
In order to guarantee the dynamic property, economy and the requirement of low emission of engine, fuel oil each time need to be accurately controlled
Straying quatity.However, the oil outlet of fuel injector control chamber can be opened when executing previous injection, and before the end when secondary injection, oil spout
The oil outlet of device control chamber can close rapidly again, intracorporal in the high-pressure oil pipe and fuel injector for connecting oily rail and fuel injector in this way
Pressure wave can be generated in pressure duct, so that the oil mass of the fuel oil of rear injection deviates electronic control unit (Electronic
Control Unit, ECU) given target value.Therefore, it is necessary to be compensated to the oil mass of rear injection, so that rear injection
Oil mass close to target value.The prior art is according to the adjacent data sprayed twice in front and back, to the principal element for influencing oil mass fluctuation
It is associated analysis, to establish oil mass oscillation compensation model, and then is compensated according to oil mass volatility model.For more than twice
Multi-injection, if only consider it is adjacent twice injection between oil mass influence of fluctuations, on the one hand, it is adjacent twice injection between oil
Amount fluctuation may not have specific regularity；On the other hand, it can also influence each other between the injection twice being separated by.Therefore, foundation
Existing oil mass oscillation compensation model compensates the oil mass of rear time injection, can make actual ejection oil mass and target oil mass it
Between differ greatly.
Summary of the invention
In view of this, the present invention is directed to propose a kind of multi-injection oil mass compensation method, at least to solve engine operation
When under the injection mode repeatedly sprayed (more than twice), oil mass caused by existing oil mass oscillation compensation model compensation is used
The problem of differing greatly can accurately compensate for each injection oil mass in engine operational cycle, so that practical spray
The target value that oil mass gives close to ECU is penetrated, to guarantee the stability of engine torque output and the emission performance of engine.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of multi-injection oil mass compensation method, comprising:
Determine that i-th injection corrects oil mass to the i-th+2 times are sprayed first and i+1 time injection sprays described the i-th+2 times
The the second amendment oil mass penetrated, wherein i takes 1 to all integers between N-2, and N is fuel injector in engine one action recycles
Injecting times；
According to it is described first amendment oil mass and it is described second amendment oil mass, to described the i-th+2 times spray target oil mass into
Row compensation.
Further, the first amendment oil mass and i+1 time injection the i-th+2 times sprayed in the determining i-th injection
Before the second amendment oil mass sprayed described the i-th+2 times, further includes:
When determining the second hydraulic delay that the first hydraulic delay time of the i-th injection, the i+1 time spray
Between, and,
According to engine water temperature and fuel oil by the temperature value before fuel filter, determine that oil temperature influences coefficient, the oil
Temperature, which influences coefficient, indicates fuel oil temperature to the influence degree of fuel density and fuel pressure；
The the first amendment oil mass and i+1 time that the determining i-th injection sprays the i-th+2 times are sprayed to described i-th+2
Second amendment oil mass of secondary injection, comprising:
The first object oil of coefficient, i-th injection is influenced according to the first hydraulic delay time, the oil temperature
Amount, the first time interval of i-th injection and the i+1 time injection determine the i-th injection to described i-th+2
First benchmark of secondary injection corrects oil mass；And coefficient, described is influenced according to the second hydraulic delay time, the oil temperature
The second target oil mass, the second time interval of the i+1 time injection and described the i-th+2 times injections of i+1 time injection, determine
The second benchmark that the i+1 time injection sprays described the i-th+2 times corrects oil mass；
According to the first object oil mass, determine that the first correction factor, first correction factor indicate the i-th spray
The influence coefficient that the oil mass penetrated sprays described the i-th+2 times；And the third target oil mass according to described the i-th+2 times injections, institute
The common rail pressure for stating i+1 time injection determines that the second correction factor, second correction factor indicate the third target oil mass
The influence coefficient that described the i-th+2 times are sprayed；
First benchmark amendment oil mass is multiplied with first correction factor, obtains the first amendment oil mass；With
And second benchmark amendment oil mass is multiplied with second correction factor, obtain the second amendment oil mass.
Further, the first hydraulic delay time of determination i-th injection, the i+1 time injection the
Two hydraulic delay times, comprising:
Control instruction is received, and the first object oil mass, the second target oil mass are determined according to the control instruction,
It wherein, include the first object oil mass, the second target oil mass in the control instruction；
The common rail pressure of the i-th injection is obtained, and is total to according to what the first object oil mass, the i-th were sprayed
Rail pressure power and the fisrt feature prestored map Map table, determine the first hydraulic delay time, wherein the fisrt feature
Map table includes the corresponding relationship of oil mass, common rail pressure and hydraulic delay time；
The common rail pressure of the i+1 time injection is obtained, and according to the second target oil mass, the i+1 time injection
Common rail pressure and the fisrt feature Map table, determine the second hydraulic delay time.
Further, described that coefficient, i-th injection are influenced according to the first hydraulic delay time, the oil temperature
First object oil mass, the first time interval of i-th injection and the i+1 time injection, determine the i-th injection
The first benchmark sprayed described the i-th+2 times corrects oil mass, comprising:
The first hydraulic delay time, the first time interval are added, the first influence time of acquisition, described first
Influence time indicates that the i-th injection sprays the duration impacted to described the i-th+2 times；
The oil temperature is influenced coefficient to be multiplied with first influence time, obtained for the first correction time；
According to the first object oil mass, first correction time and the second feature Map table prestored, institute is determined
State the first benchmark amendment oil mass, wherein the second feature Map table includes pair of oil mass, correction time and benchmark amendment oil mass
It should be related to；
Second mesh that time injection of coefficient, the i+1 is influenced according to the second hydraulic delay time, the oil temperature
The second time interval for marking oil mass, the i+1 time injection and described the i-th+2 times injections determines the i+1 time injection to institute
State the second benchmark amendment oil mass of the i-th+2 times injections, comprising:
The second hydraulic delay time, second time interval are added, the second influence time of acquisition, described second
Influence time indicates that the i+1 time injection sprays the duration impacted to described the i-th+2 times；
The oil temperature is influenced coefficient to be multiplied with second influence time, obtained for the second correction time；
According to the second target oil mass, second correction time and the second feature Map table, determine described in
Second benchmark corrects oil mass.
Further, described that oil mass is corrected according to the first amendment oil mass and described second, described the i-th+2 times are sprayed
Target oil mass compensate, comprising:
The first amendment oil mass is added with the second amendment oil mass, obtains compensation oil mass；
If the compensation oil mass is greater than the first preset correction value, and less than the second preset correction value, according to the compensation oil
Amount compensates the third target oil mass.
In the prior art, for multi-injection more than twice, only consider the oil mass fluctuation shadow between adjacent injection twice
It rings.On the one hand, in multi-injection more than twice, the oil mass fluctuation between adjacent injection twice may not have specific rule
Property；On the other hand, it in multi-injection more than twice, can also influence each other between the injection twice that is separated by.Therefore, only in accordance with
Oil mass oscillation compensation model that the adjacent data sprayed twice are established is simultaneously inaccurate, and then according to oil mass oscillation compensation model pair
The oil mass of secondary injection compensates afterwards, can make differing greatly between actual ejection oil mass and target oil mass.And the present invention is real
It applies multi-injection oil mass compensation method described in example and not only allows for oil mass fluctuation between adjacent injection twice, it is also contemplated that phase
Every twice injection between oil mass influence of fluctuations.Therefore, compared with the prior art only in accordance with the adjacent data institute sprayed twice
The oil mass oscillation compensation model of foundation sprays the method compensated, multi-injection oil mass described in the embodiment of the present invention to rear time
Compensation method can more precisely compensate each injection oil mass in engine operational cycle, so that actual ejection is oily
The target value given close to ECU is measured, to guarantee the stability of engine torque output and the emission performance of engine.
Another object of the present invention is to propose a kind of multi-injection fuel quantity compensator, at least to solve engine operation
Repeatedly (more than twice) injection injection mode under when, existing oil mass oscillation compensation model not enough precisely caused by
Oil mass difference problem can accurately compensate for each injection oil mass in engine operational cycle, so that actual ejection
The target value that oil mass gives close to ECU, to guarantee the stability of engine torque output and the emission performance of engine.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of multi-injection fuel quantity compensator, comprising: amendment oil mass determination unit, compensating unit；
The amendment oil mass determination unit, the first amendment oil mass and that the i-th+2 times are sprayed for determining i-th injection
The second amendment oil mass that i+1 injection sprays described the i-th+2 times, wherein i takes 1 to all integers between N-2, and N is to start
Machine one action recycles the injecting times of interior fuel injector；
The compensating unit, for correcting oil mass according to the first amendment oil mass and described second, to described the i-th+2 times
The target oil mass of injection compensates.
Further, described device further include: hydraulic delay time determination unit, oil temperature influence factor determination unit；
The hydraulic delay time determination unit, for determining i-th injection to i-th in the amendment oil mass determination unit
Before the second amendment oil mass that first amendment oil mass of+2 injections and i+1 time injection spray described the i-th+2 times, institute is determined
State the first hydraulic delay time of i-th injection, the second hydraulic delay time of the i+1 time injection；
The oil temperature influences factor determination unit, passes through the temperature before fuel filter according to engine water temperature and fuel oil
Value determines that oil temperature influences coefficient, and the oil temperature, which influences coefficient, indicates fuel oil temperature to the influence journey of fuel density and fuel pressure
Degree；
The amendment oil mass determination unit specifically includes: benchmark amendment oil mass determining module, is repaired at correction factor determining module
Positive oil mass computing module；
The benchmark corrects oil mass determining module, for influencing system according to the first hydraulic delay time, the oil temperature
First object oil mass, the first time interval of i-th injection and the i+1 time injection of several, the described i-th injection,
The first benchmark for determining that the i-th injection sprays described the i-th+2 times corrects oil mass；And hydraulic prolong according to described second
Slow time, the oil temperature influence the second target oil mass of coefficient, the i+1 time injection, the i+1 time injection and described the
Second time interval of i+2 injection, the second benchmark for determining that the i+1 time injection sprays described the i-th+2 times correct oil
Amount；
The correction factor determining module, for according to the first object oil mass, determining the first correction factor, described the
One correction factor indicates the influence coefficient that the oil mass of the i-th injection sprays described the i-th+2 times；And according to described i-th
The common rail pressure that third target oil mass, the i+1 time of+2 injections are sprayed, determines the second correction factor, described second repairs
Positive coefficient indicates the influence coefficient that the third target oil mass sprays described the i-th+2 times；
The amendment oil mass computing module, for first benchmark to be corrected oil mass and the first correction factor phase
Multiply, obtains the first amendment oil mass；And second benchmark amendment oil mass is multiplied with second correction factor, it obtains
Obtain the second amendment oil mass.
Further, the hydraulic delay time determination unit specifically includes: control instruction receiving module, target oil mass are true
Cover half block, common rail pressure obtain module, hydraulic delay time determining module；
The control instruction receiving module, for receiving control instruction, wherein include described first in the control instruction
Target oil mass, the second target oil mass；
The target oil mass determining module, for according to the control instruction, determining the first object oil mass, described the
Two target oil masses；
The common rail pressure obtains module, for obtaining the common rail pressure of the i-th injection；
The hydraulic delay time determining module, for the common rail according to the first object oil mass, i-th injection
Pressure and the fisrt feature prestored map Map table, determine the first hydraulic delay time, wherein the fisrt feature
Map table includes the corresponding relationship of oil mass, common rail pressure and hydraulic delay time；
The common rail pressure obtains module, is also used to obtain the common rail pressure of the i+1 time injection；
The hydraulic delay time determining module is also used to be sprayed according to the second target oil mass, the i+1 time
Common rail pressure and the fisrt feature Map table, determine the second hydraulic delay time.
Further, the benchmark amendment oil mass determining module is specifically used for:
The first hydraulic delay time, the first time interval are added, the first influence time of acquisition, described first
Influence time indicates that the i-th injection sprays the duration impacted to described the i-th+2 times；
The oil temperature is influenced coefficient to be multiplied with first influence time, obtained for the first correction time；
According to the first object oil mass, first correction time and the second feature Map table prestored, institute is determined
State the first benchmark amendment oil mass, wherein the second feature Map table includes pair of oil mass, correction time and benchmark amendment oil mass
It should be related to；
The benchmark amendment oil mass determining module is specifically also used to:
The second hydraulic delay time, second time interval are added, the second influence time of acquisition, described second
Influence time indicates that the i+1 time injection sprays the duration impacted to described the i-th+2 times；
The oil temperature is influenced coefficient to be multiplied with second influence time, obtained for the second correction time；
According to the second target oil mass, second correction time and the second feature Map table, determine described in
Second benchmark corrects oil mass.
Further, the compensating unit specifically includes: compensation oil mass computing module, compensating module；
The compensation oil mass computing module is obtained for the first amendment oil mass to be added with the second amendment oil mass
Oil mass must be compensated；
The compensating module, if being greater than the first preset correction value for the compensation oil mass, and less than the second default amendment
Value, compensates the third target oil mass according to the compensation oil mass.
The multi-injection fuel quantity compensator is had compared with the existing technology with above-mentioned multi-injection oil mass compensation method
Some advantages are identical, and details are not described herein.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is high-pressure common-rail fuel system structure chart；
Fig. 2 is multi-injection oil mass compensation method flow diagram one described in the embodiment of the present invention；
Fig. 3 is that multi-injection oil mass compensation method described in the embodiment of the present invention is applied to the schematic diagram sprayed three times；
Fig. 4 is the schematic diagram that multi-injection oil mass compensation method described in the embodiment of the present invention is applied to four injections；
Fig. 5 is multi-injection oil mass compensation method flow diagram two described in the embodiment of the present invention；
Fig. 6 is oil mass, benchmark corrects oil mass and the Map of correction time schemes；
Fig. 7 is multi-injection oil mass compensation method flow diagram three described in the embodiment of the present invention；
Fig. 8 is multi-injection oil mass compensation method flow diagram four described in the embodiment of the present invention；
Fig. 9 is multi-injection oil mass compensation method schematic illustration described in the embodiment of the present invention；
Figure 10 is multi-injection fuel quantity compensator structural schematic diagram one described in the embodiment of the present invention；
Figure 11 is multi-injection fuel quantity compensator structural schematic diagram two described in the embodiment of the present invention；
Figure 12 is multi-injection fuel quantity compensator structural schematic diagram three described in the embodiment of the present invention；
Figure 13 is multi-injection fuel quantity compensator structural schematic diagram four described in the embodiment of the present invention.
Description of symbols:
1- fuel tank, 2- fuel filter, 3- high-pressure oil pump, 4- gate gurgle valve, 5- high-pressure oil pipe, 6- common rail pipe, 7- pressure pass
Sensor, 8- fuel injector, 9-ECU, 10- sensor.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
In addition, in an embodiment of the present invention, being used for the ease of clearly describing the technical solution of the embodiment of the present invention
The printed words such as " first ", " second " distinguish function and the essentially identical identical entry of effect or similar item, those skilled in the art
Member is understood that the printed words such as " first ", " second " are not defined quantity and execution order.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
It is of the invention for ease of understanding, high-pressure common-rail fuel system structure chart first as shown in connection with fig. 1, to engine fuel
The working principle of system is briefly discussed below:
As shown in Figure 1, the fuel oil in figure in fuel tank 1 is sucked into fuel filter 2, a portion fuel oil is in high pressure oil
The plunger cavity of pump 3 is pressed to form high pressure fuel, and flows through high-pressure oil pipe 5 from the fuel-displaced valve port of high-pressure oil pump 3 and merge into common rail pipe
6, for fuel injector 8 high-pressure injection provide stablize, lasting source of high pressure, and a part of extra fuel oil is from high-pressure oil pump 3
Overflow valve at fuel tank 1 is flowed back to together with the oil return of fuel injector 8；High pressure fuel flows to hair through high-pressure oil pipe 5 from common rail pipe 6 respectively
The fuel injector 8 of each cylinder of motivation；Fuel injector 8 sprays into fuel oil each according to the ECU9 pulse given time exported and given width
In the combustion chamber of cylinder.6 one end of common rail pipe is equipped with fuel pressure transmitter 7, can fuel pressure feelings in real-time monitoring common rail pipe 6
Condition, when fuel pressure is more than the maximum value allowed, gate gurgle valve 4 is opened, and the fuel pressure in common rail pipe is rapidly decreased to safety
In range, to guarantee the safety of whole system.ECU9 acquires the engine and common rail system of each 10 real-time detection of sensor
State parameter issues accurate current pulse signal by control strategy and reservoir data, and make corresponding common rail pump solenoid valve,
Fuel injector magnetic system etc. generates electromagnetic force, to drive corresponding actuator to be acted, adjusts fuel delivery, common rail pressure, oil spout
Angle and distributive value etc., so that engine calibration be made to work.
Fig. 2 show a kind of flow diagram of multi-injection oil mass compensation method provided in an embodiment of the present invention.Referring to
Fig. 2, which comprises
S201, multi-injection fuel quantity compensator determine the first amendment oil mass and that i-th injection sprays the i-th+2 times
The second amendment oil mass that i+1 injection sprays the i-th+2 times.
Wherein, i takes 1 to all integers between N-2, and N is the injecting times of fuel injector in engine one action recycles.
S202, multi-injection fuel quantity compensator spray the i-th+2 times according to the first amendment oil mass and the second amendment oil mass
Target oil mass compensate.
It should be noted that for spraying three times, as shown in figure 3, multi-injection oil mass described in the embodiment of the present invention is mended
Compensation method only needs to consider the influence that the 1st injection, the 2nd injection spray the 3rd time, therefore a working cycles of engine
The target oil mass inside only sprayed the 3rd time compensates；And for multi-injection more than three times, per injection adjacent three times
It all needs to execute an oil mass compensation, for example, spraying for four times, needs to consider that the 1st injection, the 2nd injection spray the 3rd time
The influence sprayed for the 4th is sprayed in the influence penetrated and the 2nd injection for the 3rd time, specific as shown in Figure 4.Therefore, for four
Secondary injection needs respectively to compensate the target oil mass of the 3rd injection and the 4th injection.
Therefore for multi-injection more than twice, multi-injection oil mass compensation side described in the embodiment of the present invention
Method not only allows for the oil mass fluctuation between adjacent injection twice, it is also contemplated that the oil mass fluctuation shadow between the injection twice being separated by
It rings.Therefore, the oil mass oscillation compensation model established compared with the prior art only in accordance with the adjacent data sprayed twice is to rear time
The method compensated is sprayed, multi-injection oil mass compensation method described in the embodiment of the present invention can be to engine operational cycle
Interior each injection oil mass is more precisely compensated, so that the target value that actual ejection oil mass gives close to ECU, to protect
Demonstrate,prove the stability of engine torque output and the emission performance of engine.
Preferably, as shown in figure 5, in multi-injection oil mass compensation method provided in an embodiment of the present invention, in multi-injection
Fuel quantity compensator determines that the first amendment oil mass that i-th injection sprays the i-th+2 times and i+1 time injection spray the i-th+2 times
Before the second amendment oil mass penetrated, can also include:
S203, multi-injection fuel quantity compensator determine the first hydraulic delay time of i-th injection, i+1 time injection
The second hydraulic delay time.
It should be noted that being influenced by fuel injector structure characteristic, the open and close time sprayed every time can all occur
Certain delay, thus multi-injection oil mass compensation method provided in an embodiment of the present invention by the hydraulic delay time for oil mass
Influence of fluctuations is taken into account.
S204, multi-injection fuel quantity compensator pass through the temperature before fuel filter according to engine water temperature and fuel oil
Value determines that oil temperature influences coefficient.
Wherein, oil temperature, which influences coefficient, indicates fuel oil temperature to the influence degree of fuel density and fuel pressure.
It should be noted that fuel oil temperature can have an impact fuel density and fuel pressure, and fuel density and fuel oil
Pressure will affect the amount of injection of fuel oil again.Therefore, it is necessary to take into account the influence of fuel oil temperature, but it is based on the prior art, it is difficult
To directly obtain the temperature of the fuel oil entered in fuel injector.Thus, multi-injection oil mass provided in an embodiment of the present invention compensation side
Method, by comprehensively consider engine water temperature and fuel filter before temperature value (i.e. combustion filter before oil temperature) to fuel density and combustion
The influence of oil pressure obtains influence of the fuel oil temperature for fuel density and fuel pressure indirectly, thus by fuel oil temperature pair
It is taken into account in the influence of injection oil mass fluctuation.
Specifically, can in advance by platform experiment monitor engine water temperature, fuel oil by temperature value before fuel filter,
The dynamic change of actual ejection oil mass obtains the variation relation of three, and then determines engine water temperature, combustion according to the variation relation
Oil influences the corresponding relationship of coefficient by the temperature value before fuel filter with oil temperature, and stores the corresponding relationship.Executing sheet
When the invention method, first passes through temperature sensor and measure engine water temperature and fuel oil and pass through the temperature before fuel filter
Value obtains oil temperature influence coefficient further according to the corresponding relationship of storage.The present invention is not especially limit this.
Multi-injection fuel quantity compensator determines the first amendment oil mass and i+1 time that i-th injection sprays the i-th+2 times
The second amendment oil mass (i.e. S201) sprayed the i-th+2 times is sprayed, can specifically include:
S201a, multi-injection fuel quantity compensator influence coefficient according to the first hydraulic delay time, oil temperature, i-th is sprayed
First object oil mass, the first time interval of i-th injection and i+1 time injection, determine that i-th injection sprays the i-th+2 times
The the first benchmark amendment oil mass penetrated；And the second of time injection of coefficient, i+1 is influenced according to the second hydraulic delay time, oil temperature
Second time interval of target oil mass, i+1 time injection and the i-th+2 times injections determines that i+1 time injection sprays the i-th+2 times
The second benchmark correct oil mass.
S201b, multi-injection fuel quantity compensator determine the first correction factor according to first object oil mass；And according to
The common rail pressure that third target oil mass, the i+1 time of the i-th+2 times injections are sprayed, determines the second correction factor.
Wherein, the first correction factor indicates the influence coefficient that the oil mass of i-th injection sprays the i-th+2 times, the second amendment
Coefficient indicates the influence coefficient that third target oil mass sprays the i-th+2 times.
First benchmark amendment oil mass is multiplied with the first correction factor by S201c, multi-injection fuel quantity compensator, acquisition the
One amendment oil mass；And the second benchmark amendment oil mass is multiplied with the second correction factor, obtain the second amendment oil mass.
Preferably, in step S201a, multi-injection fuel quantity compensator is influenced according to the first hydraulic delay time, oil temperature
Coefficient, the first object oil mass of i-th injection, the first time interval of i-th injection and i+1 time injection, determine that i-th is sprayed
It penetrates the first benchmark sprayed the i-th+2 times and corrects oil mass, can specifically include:
First hydraulic delay time, first time interval are added by multi-injection fuel quantity compensator, and obtaining first influences
Time, the first influence time indicate that i-th injection sprays the duration impacted to the i-th+2 times；
Oil temperature is influenced coefficient and is multiplied with the first influence time by multi-injection fuel quantity compensator, when obtaining the first amendment
Between；
Multi-injection fuel quantity compensator is according to first object oil mass, the first correction time and the second feature prestored
Map table determines that the first benchmark corrects oil mass.
Wherein, second feature Map table includes the corresponding relationship of oil mass, correction time and benchmark amendment oil mass.Second feature
The Map figure (referring to Fig. 6) that Map table can specifically be corrected between oil mass by oil mass, correction time and benchmark obtains, the Map figure
It can then be obtained in advance by platform experiment, the present invention is not especially limit this.
Similar, multi-injection fuel quantity compensator influences coefficient, i+1 time according to the second hydraulic delay time, oil temperature
The second target oil mass, the second time intervals of i+1 time injection and the i-th+2 times injections of injection determine i+1 time injection to the
Second benchmark of i+2 injection corrects oil mass, can specifically include:
Second hydraulic delay time, the second time interval are added by multi-injection fuel quantity compensator, and obtaining second influences
Time, the second influence time indicate that i+1 time injection sprays the duration impacted to the i-th+2 times；
Oil temperature is influenced coefficient and is multiplied with the second influence time by multi-injection fuel quantity compensator, when obtaining the second amendment
Between；
Multi-injection fuel quantity compensator according to the second target oil mass, the second correction time and second feature Map table,
Determine that the second benchmark corrects oil mass.
Preferably, in step S201b, multi-injection fuel quantity compensator determines the first amendment according to first object oil mass
Coefficient can specifically include:
Multi-injection fuel quantity compensator is according to first object oil mass, and the oil mass and pair of the first correction factor that prestore
It should be related to, determine the first correction factor.
Third target oil mass, the common rail pressure of i+1 time injection that multi-injection fuel quantity compensator is sprayed according to the i-th+2 times
Power determines the second correction factor, can specifically include:
Multi-injection fuel quantity compensator according to third target oil mass, i+1 time injection common rail pressure and prestore
Third feature Map table, determines the second correction factor.
Wherein, third feature Map table includes the corresponding relationship of oil mass, common rail pressure and the second correction factor.
In addition, it should be noted that, the corresponding relationship of oil mass and the first correction factor specifically can be oil mass and repair with first
The functional relation linearly or nonlinearly of positive coefficient, and can be obtained in advance by platform experiment, detailed process and aforementioned determination
The process that oil temperature influences coefficient is similar, and details are not described herein again.
Preferably, as shown in fig. 7, in multi-injection oil mass compensation method provided in an embodiment of the present invention, multi-injection oil
Amount compensation device determines the second hydraulic delay time of the first hydraulic delay time of i-th injection, i+1 secondary injection (i.e.
S203), can specifically include:
S203a, multi-injection fuel quantity compensator receive control instruction, and determine first object oil according to control instruction
Amount, the second target oil mass, wherein include first object oil mass, the second target oil mass in control instruction.
S203b, multi-injection fuel quantity compensator obtain i-th injection common rail pressure, and according to first object oil mass,
The common rail pressure of i-th injection and the fisrt feature Map table prestored, determined for the first hydraulic delay time.
Wherein, fisrt feature Map table includes the corresponding relationship of oil mass, common rail pressure and hydraulic delay time.
S203c, multi-injection fuel quantity compensator obtain the common rail pressure of i+1 time injection, and according to the second target oil
The common rail pressure and fisrt feature Map table of amount, i+1 time injection, determined for the second hydraulic delay time.
Specifically, as shown in figure 8, multi-injection is oily in multi-injection oil mass compensation method provided in an embodiment of the present invention
Compensation device is measured to be compensated (i.e. according to the first amendment oil mass and the second amendment oil mass, the target oil mass for spraying the i-th+2 times
S202), can specifically include:
First amendment oil mass is added by S202a, multi-injection fuel quantity compensator with the second amendment oil mass, obtains compensation oil
Amount.
If S202b, compensation oil mass are greater than the first preset correction value, and less than the second preset correction value, multi-injection oil mass
Compensation device compensates third target oil mass according to compensation oil mass.
Wherein, the first preset correction value is the permitted maximum modified value of system, and the second preset correction value is permitted by system
Perhaps minimum correction value, and the first preset correction value and the second preset correction value specifically can be obtained rule of thumb, the present invention is implemented
Example is not especially limited this.
In this way, when the parameter that system breaks down or compensation device obtains is incorrect, and then cause finally to calculate resulting
When compensating oil mass mistake, that is, it can avoid Error Compensation, guarantee the safety of system.
Illustratively, it in conjunction with above-mentioned specific embodiment, provides and uses multi-injection oil mass provided in an embodiment of the present invention
The specific example that compensation method carries out oil mass compensation is following (its principle is as shown in Figure 9):
S1, according to control instruction, obtain first time interval, first object oil mass, the first common rail pressure, between the second time
Every, the second target oil mass, the second common rail pressure and third target oil mass；According to temperature sensor, obtain engine water temperature,
Oil temperature before combustion is filtered.
S2, according to first object oil mass, the first common rail pressure and fisrt feature Map table, determined for the first hydraulic delay time,
And be added for the first hydraulic delay time with first time interval, obtain the first influence time.
S3, according to the second target oil mass, the second common rail pressure and second feature Map table, determined for the second hydraulic delay time,
And be added for the second hydraulic delay time with the second time interval, obtain the second influence time.
S4, preceding oil temperature is filtered according to engine water temperature and combustion, determines that oil temperature influences coefficient.
S5, oil temperature influence coefficient is multiplied with the first influence time, the second influence time respectively, when obtaining the first amendment
Between, the second correction time.
S6, according to the first correction time, first object oil mass and second feature Map table, determine that the first benchmark corrects oil mass.
S7, according to the second correction time, the second target oil mass and second feature Map table, determine that the second benchmark corrects oil mass.
S8, according to first object oil mass, determine the first correction factor.
S9, according to third target oil mass, the second common rail pressure and third feature Map table, determine the second correction factor.
S10, the first benchmark amendment oil mass is multiplied with the first correction factor, obtains the first amendment oil mass.
S11, the second benchmark amendment oil mass is multiplied with the second correction factor, obtains the second amendment oil mass.
S12, the first amendment oil mass is added with the second amendment oil mass, obtains compensation oil mass.
If S13, compensation oil mass are greater than the first preset correction value, and less than the second preset correction value, according to compensation oil mass pair
Third target oil mass compensates.
So far, oil mass compensation terminates.Certainly, above-mentioned example is only the preferred embodiment that the embodiment of the present invention provides,
The invention is not limited thereto.
In the prior art, for multi-injection more than twice, only consider the oil mass fluctuation shadow between adjacent injection twice
It rings.On the one hand, in multi-injection more than twice, the oil mass fluctuation between adjacent injection twice may not have specific rule
Property；On the other hand, it in multi-injection more than twice, can also influence each other between the injection twice that is separated by.Therefore, only in accordance with
Oil mass oscillation compensation model that the adjacent data sprayed twice are established is simultaneously inaccurate, and then according to oil mass oscillation compensation model pair
The oil mass of secondary injection compensates afterwards, can make differing greatly between actual ejection oil mass and target oil mass.And the present invention is real
It applies multi-injection oil mass compensation method described in example and not only allows for oil mass fluctuation between adjacent injection twice, it is also contemplated that phase
Every twice injection between oil mass influence of fluctuations.Therefore, compared with the prior art only in accordance with the adjacent data institute sprayed twice
The oil mass oscillation compensation model of foundation sprays the method compensated, multi-injection oil mass described in the embodiment of the present invention to rear time
Compensation method can more precisely compensate each injection oil mass in engine operational cycle, so that actual ejection is oily
The target value given close to ECU is measured, to guarantee the stability of engine torque output and the emission performance of engine.
Figure 10 show a kind of 100 structural schematic diagram of multi-injection fuel quantity compensator provided in an embodiment of the present invention, packet
It includes: amendment oil mass determination unit 1001, compensating unit 1002.
Wherein, oil mass determination unit 1001 is corrected, the first amendment oil sprayed for determining i-th injection the i-th+2 times
The second amendment oil mass that amount and i+1 time injection spray the i-th+2 times.
Wherein, i takes 1 to all integers between N-2, and N is the injecting times of fuel injector in engine one action recycles.
Compensating unit 1002, for oily according to the first amendment oil mass and the second amendment oil mass, the target sprayed the i-th+2 times
Amount compensates.
Further, as shown in figure 11, multi-injection fuel quantity compensator 100 described in the embodiment of the present invention can also wrap
Include: hydraulic delay time determination unit 1003, oil temperature influence factor determination unit 1004.
Wherein, hydraulic delay time determination unit 1003, for determining i-th injection in amendment oil mass determination unit 1001
Before the second amendment oil mass that the first amendment oil mass and i+1 time injection sprayed the i-th+2 times spray the i-th+2 times, determine
The second hydraulic delay time that first hydraulic delay time of i-th injection, i+1 time are sprayed；
Oil temperature influences factor determination unit 1004, passes through the temperature before fuel filter according to engine water temperature and fuel oil
Value determines that oil temperature influences coefficient, and oil temperature, which influences coefficient, indicates fuel oil temperature to the influence degree of fuel density and fuel pressure.
Then, amendment oil mass determination unit 1001 can specifically include: benchmark corrects oil mass determining module 1001a, amendment system
Number determining module 1001b, amendment oil mass computing module 1001c.
Wherein, benchmark correct oil mass determining module 1001a, for according to the first hydraulic delay time, oil temperature influence coefficient,
First object oil mass, the first time interval of i-th injection and i+1 time injection of i-th injection, determine i-th injection pair
First benchmark of the i-th+2 times injections corrects oil mass；And coefficient, i+1 time are influenced according to the second hydraulic delay time, oil temperature
The second target oil mass, the second time intervals of i+1 time injection and the i-th+2 times injections of injection determine i+1 time injection to the
Second benchmark of i+2 injection corrects oil mass；
Correction factor determining module 1001b, for determining the first correction factor, the first amendment according to first object oil mass
Coefficient indicates the influence coefficient that the oil mass of i-th injection sprays the i-th+2 times；And the third target sprayed according to the i-th+2 times
The common rail pressure of oil mass, i+1 time injection determines that the second correction factor, the second correction factor indicate third target oil mass to i-th
The influence coefficient of+2 injections；
Oil mass computing module 1001c is corrected, for the first benchmark amendment oil mass to be multiplied with the first correction factor, acquisition the
One amendment oil mass；And the second benchmark amendment oil mass is multiplied with the second correction factor, obtain the second amendment oil mass.
Further, as shown in figure 12, hydraulic in multi-injection fuel quantity compensator 100 described in the embodiment of the present invention
Delay time determination unit 1003 specifically includes: control instruction receiving module 1003a, target oil mass determining module 1003b, common rail
Pressure acquisition module 1003c, hydraulic delay time determining module 1003d.
Control instruction receiving module 1003a, for receiving control instruction, wherein include first object oil in control instruction
Amount, the second target oil mass；
Target oil mass determining module 1003b, for determining first object oil mass, the second target oil mass according to control instruction；
Common rail pressure obtains module 1003c, for obtaining the common rail pressure of i-th injection；
Hydraulic delay time determining module 1003d, for according to first object oil mass, i-th injection common rail pressure, with
And the fisrt feature mapping Map table prestored, determined for the first hydraulic delay time, wherein fisrt feature Map table includes oil mass, is total to
The corresponding relationship of rail pressure power and hydraulic delay time；
Common rail pressure obtains module 1003c, is also used to obtain the common rail pressure of i+1 time injection；
Hydraulic delay time determining module 1003d is also used to the common rail pressure according to the second target oil mass, i+1 time injection
Power and fisrt feature Map table, determined for the second hydraulic delay time.
Preferably, benchmark amendment oil mass determining module 1001a is specifically used for:
First hydraulic delay time, first time interval are added, the first influence time is obtained, the first influence time indicates
I-th injection sprays the duration impacted to the i-th+2 times；
Oil temperature is influenced coefficient to be multiplied with the first influence time, obtained for the first correction time；
According to first object oil mass, the first correction time and the second feature Map table prestored, determine that the first benchmark is repaired
Positive oil mass, wherein second feature Map table includes the corresponding relationship of oil mass, correction time and benchmark amendment oil mass.
Benchmark amendment oil mass determining module 1001a is specifically also used to:
Second hydraulic delay time, the second time interval are added, the second influence time is obtained, the second influence time indicates
I+1 time injection sprays the duration impacted to the i-th+2 times；
Oil temperature is influenced coefficient to be multiplied with the second influence time, obtained for the second correction time；
According to the second target oil mass, the second correction time and second feature Map table, determine that the second benchmark corrects oil mass.
Preferably, correction factor determining module 1001b is specifically used for:
According to first object oil mass, and the oil mass and the corresponding relationship of the first correction factor that prestore, determine the first amendment
Coefficient；
Correction factor determining module 1001b is specifically also used to:
According to third target oil mass, the common rail pressure of i+1 time injection and the third feature Map table that prestores, the is determined
Two correction factors, wherein third feature Map table includes the corresponding relationship of oil mass, common rail pressure and the second correction factor.
Further, as shown in figure 13, in multi-injection fuel quantity compensator 100 described in the embodiment of the present invention, compensation
Unit 1002 specifically includes: compensation oil mass computing module 1002a, compensating module 1002b.
Wherein, oil mass computing module 1002a is compensated, for the first amendment oil mass to be added with the second amendment oil mass, is obtained
Compensate oil mass.
Compensating module 1002b, if being greater than the first preset correction value for compensating oil mass, and less than the second preset correction value,
Third target oil mass is compensated according to compensation oil mass.
Specifically, being mended using multi-injection fuel quantity compensator 100 provided in an embodiment of the present invention to target oil mass
The method repaid can refer to the aforementioned associated description of the embodiment of the present invention, and details are not described herein.
In the prior art, for multi-injection more than twice, only consider the oil mass fluctuation shadow between adjacent injection twice
It rings.On the one hand, in multi-injection more than twice, the oil mass fluctuation between adjacent injection twice may not have specific rule
Property；On the other hand, it in multi-injection more than twice, can also influence each other between the injection twice that is separated by.Therefore, only in accordance with
Oil mass oscillation compensation model that the adjacent data sprayed twice are established is simultaneously inaccurate, and then according to oil mass oscillation compensation model pair
The oil mass of secondary injection compensates afterwards, can make differing greatly between actual ejection oil mass and target oil mass.And the present invention is real
Multi-injection fuel quantity compensator described in example is applied, the oil mass fluctuation between adjacent injection twice is not only allowed for, it is also contemplated that
The oil mass influence of fluctuations between injection twice being separated by.Therefore, compared with the prior art only in accordance with the adjacent data sprayed twice
The oil mass oscillation compensation model established sprays the method compensated, the oil of multi-injection described in the embodiment of the present invention to rear time
Amount compensation device can more precisely compensate each injection oil mass in engine operational cycle, so that actual ejection
The target value that oil mass gives close to ECU, to guarantee the stability of engine torque output and the emission performance of engine.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of multi-injection oil mass compensation method, which is characterized in that the described method includes:
Determine the first hydraulic delay time of i-th injection, the second hydraulic delay time of i+1 time injection, and,
According to engine water temperature and fuel oil by the temperature value before fuel filter, determine that oil temperature influences coefficient, the oil temperature shadow
Ringing coefficient indicates fuel oil temperature to the influence degree of fuel density and fuel pressure；
Determine that the i-th injection corrects oil mass and the i+1 time injection to described i-th+2 to the i-th+2 times are sprayed first
Second amendment oil mass of secondary injection, wherein i takes 1 to all integers between N-2, and N is oil spout in engine one action recycles
The injecting times of device, specifically include:
Coefficient, the first object oil mass of i-th injection, institute are influenced according to the first hydraulic delay time, the oil temperature
The first time interval for stating i-th injection with the i+1 time injection determines that the i-th injection sprays described the i-th+2 times
The first benchmark correct oil mass；And coefficient, the i+1 time are influenced according to the second hydraulic delay time, the oil temperature
The second target oil mass, the second time interval of the i+1 time injection and described the i-th+2 times injections of injection, determine described i-th
The second benchmark that+1 injection sprays described the i-th+2 times corrects oil mass；
According to the first object oil mass, determine that the first correction factor, first correction factor indicate the i-th injection
The influence coefficient that oil mass sprays described the i-th+2 times；And according to described the i-th+2 times third target oil masses sprayed, described the
The common rail pressure of i+1 injection determines that the second correction factor, second correction factor indicate the third target oil mass to institute
State the influence coefficient of the i-th+2 times injections；
First benchmark amendment oil mass is multiplied with first correction factor, obtains the first amendment oil mass；And it will
The second benchmark amendment oil mass is multiplied with second correction factor, obtains the second amendment oil mass；
It is mended according to the first amendment oil mass and the second amendment oil mass, the target oil mass sprayed described the i-th+2 times
It repays.
2. the method according to claim 1, wherein the first hydraulic delay of the determination i-th injection
The second hydraulic delay time that time, the i+1 time are sprayed, comprising:
Control instruction is received, and the first object oil mass, the second target oil mass are determined according to the control instruction,
In, it include the first object oil mass, the second target oil mass in the control instruction；
Obtain the common rail pressure of the i-th injection, and the common rail pressure sprayed according to the first object oil mass, the i-th
Power and the fisrt feature Map table prestored, determine the first hydraulic delay time, wherein the fisrt feature Map table packet
Include the corresponding relationship of oil mass, common rail pressure and hydraulic delay time；
The common rail pressure of the i+1 time injection is obtained, and is total to according to what the second target oil mass, the i+1 time were sprayed
Rail pressure power and the fisrt feature Map table, determine the second hydraulic delay time.
3. the method according to claim 1, wherein described according to the first hydraulic delay time, the oil
When temperature influences the first of coefficient, the first object oil mass of i-th injection, i-th injection and the i+1 time injection
Between be spaced, the first benchmark for determining that i-th injection sprays described the i-th+2 times corrects oil mass, comprising:
The first hydraulic delay time, the first time interval are added, the first influence time is obtained, described first influences
Time indicates that the i-th injection sprays the duration impacted to described the i-th+2 times；
The oil temperature is influenced coefficient to be multiplied with first influence time, obtained for the first correction time；
According to the first object oil mass, first correction time and the second feature Map table prestored, described is determined
One benchmark corrects oil mass, wherein the second feature Map table includes the corresponding pass of oil mass, correction time and benchmark amendment oil mass
System；
The second target oil that time injection of coefficient, the i+1 is influenced according to the second hydraulic delay time, the oil temperature
Amount, the second time intervals of the i+1 time injection and described the i-th+2 times injections determine the i+1 time injection to described the
Second benchmark of i+2 injection corrects oil mass, comprising:
The second hydraulic delay time, second time interval are added, the second influence time is obtained, described second influences
Time indicates that the i+1 time injection sprays the duration impacted to described the i-th+2 times；
The oil temperature is influenced coefficient to be multiplied with second influence time, obtained for the second correction time；
According to the second target oil mass, second correction time and the second feature Map table, described second is determined
Benchmark corrects oil mass.
4. method according to claim 1-3, which is characterized in that described according to the first amendment oil mass and institute
The second amendment oil mass is stated, the target oil mass sprayed described the i-th+2 times compensates, comprising:
The first amendment oil mass is added with the second amendment oil mass, obtains compensation oil mass；
If the compensation oil mass is greater than the first preset correction value, and less than the second preset correction value, according to the compensation oil mass pair
Third target oil mass compensates.
5. a kind of multi-injection fuel quantity compensator, which is characterized in that described device include: hydraulic delay time determination unit,
Oil temperature influences factor determination unit, amendment oil mass determination unit, compensating unit；
The hydraulic delay time determination unit, for determining the first hydraulic delay time, the i+1 time injection of i-th injection
The second hydraulic delay time；
The oil temperature influences factor determination unit, according to engine water temperature and fuel oil by the temperature value before fuel filter, really
Stand oil temperature influences coefficient, and the oil temperature, which influences coefficient, indicates fuel oil temperature to the influence degree of fuel density and fuel pressure；
The amendment oil mass determination unit, for determining that the i-th injection corrects oil mass and institute to the i-th+2 times are sprayed first
State the second amendment oil mass that i+1 time injection sprays described the i-th+2 times, wherein i takes 1 to all integers between N-2, and N is
Engine one action recycles the injecting times of interior fuel injector, specifically includes: it is true that benchmark corrects oil mass determining module, correction factor
Cover half block, amendment oil mass computing module；
The benchmark corrects oil mass determining module, for influencing coefficient, institute according to the first hydraulic delay time, the oil temperature
The first object oil mass of i-th injection, the first time interval of i-th injection and the i+1 time injection are stated, determines institute
It states the first benchmark that i-th injection sprays described the i-th+2 times and corrects oil mass；And according to the second hydraulic delay time,
The oil temperature influences the second target oil mass of coefficient, the i+1 time injection, the i+1 time injection and described the i-th+2 times sprays
The second time interval penetrated, the second benchmark for determining that the i+1 time injection sprays described the i-th+2 times correct oil mass；
The correction factor determining module, for determining the first correction factor, described first repairs according to the first object oil mass
Positive coefficient indicates the influence coefficient that the oil mass of the i-th injection sprays described the i-th+2 times；And according to described the i-th+2 times
The common rail pressure that third target oil mass, the i+1 time of injection are sprayed determines the second correction factor, second amendment system
Number indicates the influence coefficient that the third target oil mass sprays described the i-th+2 times；
The amendment oil mass computing module is obtained for first benchmark amendment oil mass to be multiplied with first correction factor
Obtain the first amendment oil mass；And second benchmark amendment oil mass is multiplied with second correction factor, described in acquisition
Second amendment oil mass；
The compensating unit, for spraying described the i-th+2 times according to the first amendment oil mass and the second amendment oil mass
Target oil mass compensate.
6. device according to claim 5, which is characterized in that the hydraulic delay time determination unit specifically includes: control
Command reception module processed, target oil mass determining module, common rail pressure obtain module, hydraulic delay time determining module；
The control instruction receiving module, for receiving control instruction, wherein include the first object in the control instruction
Oil mass, the second target oil mass；
The target oil mass determining module, for determining the first object oil mass, second mesh according to the control instruction
Mark oil mass；
The common rail pressure obtains module, for obtaining the common rail pressure of the i-th injection；
The hydraulic delay time determining module, for the common rail pressure according to the first object oil mass, i-th injection
Power and the fisrt feature Map table prestored, determine the first hydraulic delay time, wherein the fisrt feature Map table packet
Include the corresponding relationship of oil mass, common rail pressure and hydraulic delay time；
The common rail pressure obtains module, is also used to obtain the common rail pressure of the i+1 time injection；
The hydraulic delay time determining module is also used to the common rail according to the second target oil mass, the i+1 time injection
Pressure and the fisrt feature Map table, determine the second hydraulic delay time.
7. device according to claim 5, which is characterized in that the benchmark amendment oil mass determining module is specifically used for:
The first hydraulic delay time, the first time interval are added, the first influence time is obtained, described first influences
Time indicates that the i-th injection sprays the duration impacted to described the i-th+2 times；
The oil temperature is influenced coefficient to be multiplied with first influence time, obtained for the first correction time；
According to the first object oil mass, first correction time and the second feature Map table prestored, described is determined
One benchmark corrects oil mass, wherein the second feature Map table includes the corresponding pass of oil mass, correction time and benchmark amendment oil mass
System；
The benchmark amendment oil mass determining module is specifically also used to:
The second hydraulic delay time, second time interval are added, the second influence time is obtained, described second influences
Time indicates that the i+1 time injection sprays the duration impacted to described the i-th+2 times；
The oil temperature is influenced coefficient to be multiplied with second influence time, obtained for the second correction time；
According to the second target oil mass, second correction time and the second feature Map table, described second is determined
Benchmark corrects oil mass.
8. according to the described in any item devices of claim 5-7, which is characterized in that the compensating unit specifically includes: compensation oil
Measure computing module, compensating module；
The compensation oil mass computing module is mended for the first amendment oil mass to be added with the second amendment oil mass
Repay oil mass；
The compensating module, if being greater than the first preset correction value for the compensation oil mass, and less than the second preset correction value, root
Third target oil mass is compensated according to the compensation oil mass.
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| CN112879174B (en) * | 2021-01-27 | 2022-12-27 | 东风汽车集团股份有限公司 | Gasoline engine injection mode switching fuel compensation control method and system and storage medium |
| CN114592985B (en) * | 2022-03-21 | 2022-11-08 | 中国第一汽车股份有限公司 | Multi-injection oil injection control method, vehicle and storage medium |
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