CN110273773B - Control method and device for natural gas engine injection - Google Patents
Control method and device for natural gas engine injection Download PDFInfo
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- CN110273773B CN110273773B CN201910581135.4A CN201910581135A CN110273773B CN 110273773 B CN110273773 B CN 110273773B CN 201910581135 A CN201910581135 A CN 201910581135A CN 110273773 B CN110273773 B CN 110273773B
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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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
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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
- F02D41/32—Controlling fuel injection of the low pressure type
- F02D41/34—Controlling fuel injection of the low pressure type with means for controlling injection timing or duration
Abstract
The invention provides a control method for natural gas engine injection, which comprises the following steps: acquiring an injection signal; wherein the injection signal comprises: injection parameters and a first injection duration; calculating to obtain a second injection duration according to the injection parameters; judging whether the second injection time length is consistent with the first injection time length or not; if the second injection time length is judged to be longer than the first injection time length, replacing the first injection time length in the injection signal with the second injection time length, and controlling the natural gas engine to inject in a third injection time length; wherein the third injection period is a difference between the second injection period and the first injection period. If the second injection duration is judged to be longer than the first injection duration, the second injection duration is updated to the injection signal, and the natural gas engine is controlled to inject in the third injection duration, so that the injection quantity is more matched with the current working condition, and the follow-up performance of the excess air coefficient is improved.
Description
Technical Field
The invention relates to the field of natural gas engines, in particular to a method and a device for controlling injection of a natural gas engine.
Background
With the development of economy, almost every family has a car belonging to it, resulting in higher and higher oil prices, and in comparison, the price of natural gas is much lower than that of gasoline and diesel oil, and the fuel cost is generally saved by about 50%, so that the operation cost is greatly reduced. Due to the existence of the oil-gas difference price, the vehicle-changing cost can be recovered within one year. Therefore, natural gas engines are becoming increasingly popular.
At present, a natural gas engine is injected from an air inlet channel according to acquired injection information, the current injection amount is calculated according to injection parameters in the injection information before each injection, the injection information including the injection parameters is updated only once in a working cycle of the natural gas engine, if the working condition is detected to change (sudden increase or sudden decrease) after the calculation of the injection parameters is completed, the injection amount executed by a cylinder at this time is calculated according to the working condition before the change of the injection parameters to be executed. When transient working conditions occur, the follow-up performance of the excess air coefficient is poor.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and an apparatus for controlling injection of a natural gas engine, so as to improve the following performance of an excess air coefficient when transient operating conditions occur.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
a control method of a natural gas engine, comprising:
acquiring an injection signal; wherein the injection signal comprises: injection parameters and a first injection duration;
calculating to obtain a second injection duration according to the injection parameters;
judging whether the second injection time length is consistent with the first injection time length or not;
if the second injection time length is judged to be longer than the first injection time length, replacing the first injection time length in the injection signal with the second injection time length, and controlling the natural gas engine to inject in a third injection time length; wherein the third injection period is a difference between the second injection period and the first injection period.
Optionally, the acquiring an injection signal includes:
acquiring the injection signal a plurality of times within one working cycle of the natural gas engine; and the interval between two adjacent times of acquiring the injection signals is a first preset interval.
Optionally, the replacing the second injection period for the first injection period in the injection signal and controlling the natural gas engine to inject in a third injection period includes:
replacing the second injection period for the first injection period in the injection signal;
calculating the difference value between the second injection time length and the first injection time length to obtain a third injection time length;
calculating the time range of the third injection time period according to the injection position of the natural engine at the end of the second injection time period, the minimum injection interval and the injection preparation time period;
judging whether the third injection time length is within the time length range of the third injection time length;
and if the third injection duration is judged to be within the duration range of the third injection duration, controlling the natural gas engine to inject within the third injection duration.
Optionally, the method for controlling injection of a natural gas engine further includes:
and if the second injection time length is judged to be less than or equal to the first injection time length, replacing the first injection time length in the injection signal with the second injection time length.
Optionally, before replacing the first injection period in the injection signal with the second injection period, the method further includes:
judging whether an injection valve of the natural gas engine is opening;
and if the injection valve is judged to be opened, closing the injection valve.
A control device for natural gas engine injection, comprising:
an acquisition unit configured to acquire an injection signal; wherein the injection signal comprises: injection parameters and a first injection duration;
the first calculating unit is used for calculating a second injection duration according to the injection parameters;
a first judgment unit configured to judge whether the second injection period is consistent with the first injection period;
the control unit is used for replacing the first injection duration in the injection signal with the second injection duration and controlling the natural gas engine to inject within a third injection duration if the second injection duration is longer than the first injection duration and judged by the first judging unit; wherein the third injection period is a difference between the second injection period and the first injection period.
Optionally, the obtaining unit includes:
an acquisition subunit configured to acquire the injection signal a plurality of times within one working cycle of the natural gas engine; and the interval between two adjacent times of acquiring the injection signals is a first preset interval.
Optionally, the control unit includes:
a first replacement unit configured to replace the first injection period in the injection signal with the second injection period;
the second calculation unit is used for calculating the difference value between the second injection time length and the first injection time length to obtain a third injection time length;
a third calculation unit for calculating a time length range of the third injection period based on an injection position of the natural engine at the end of the second injection period, a minimum interval of injection, and an injection preparation period;
a second determination unit configured to determine whether the third injection period is within a period range of the third injection period;
and the control subunit is configured to control the natural gas engine to inject within the third injection period if the third injection period is within the period range of the third injection period as determined by the second determination unit.
Optionally, the apparatus for controlling injection of a natural gas engine further comprises:
and the second replacing unit is used for replacing the first injection time length in the injection signal with the second injection time length if the first judging unit judges that the second injection time length is less than or equal to the first injection time length.
A third judgment unit for judging whether an injection valve of the natural gas engine is opening;
and the closing unit is used for closing the injection valve if the third judging unit judges that the injection valve is opened.
According to the scheme, the injection signal is obtained in the control method and the control device for the injection of the natural gas engine provided by the application; wherein the injection signal comprises: injection parameters and a first injection duration; calculating to obtain a second injection duration according to the injection parameters; judging whether the second injection time length is consistent with the first injection time length or not; if the second injection time length is judged to be longer than the first injection time length, replacing the first injection time length in the injection signal with the second injection time length, and controlling the natural gas engine to inject in a third injection time length; wherein the third injection period is a difference between the second injection period and the first injection period. And if the second injection duration is judged to be longer than the first injection duration, updating the second injection duration to the injection signal, and controlling the natural gas engine to inject in a third injection duration, so that the injection quantity is more matched with the current working condition, and the follow-up property of the excess air coefficient is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a detailed flow chart of a method for controlling injection in a natural gas engine according to an embodiment of the present invention;
FIG. 2 is a detailed flow chart of a method for controlling injection in a natural gas engine according to another embodiment of the present invention;
FIG. 3 is a detailed flow chart of a method for controlling injection in a natural gas engine according to another embodiment of the present invention;
FIG. 4 is a schematic diagram of a control apparatus for natural gas engine injection according to another embodiment of the present invention;
FIG. 5 is a schematic diagram of a control arrangement for natural gas engine injection according to another embodiment of the present invention;
fig. 6 is a schematic diagram of a control device for natural gas engine injection according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a method for controlling injection of a natural gas engine, as shown in fig. 1, including:
s101, acquiring an injection signal.
Wherein the injection signal includes an injection parameter and a first injection period.
Specifically, the injection parameters include an injection advance angle, an injection quantity required to be injected by the natural gas engine at the time, and the like; the first injection period is the time that the natural gas engine injects in the last period when the injection signal is acquired this time.
Optionally, in another embodiment of the present invention, one implementation manner of step S101 includes:
the injection signal is acquired multiple times during one operating cycle of the natural gas engine.
The interval between two adjacent times of acquiring the injection signals is a first preset interval.
Specifically, one working cycle of the natural gas engine is 720 °, in the implementation of the embodiment, the angular intervals of the multiple acquisition of the injection signals are the same, and the acquisition of the injection signals may be 180 °, but is not limited to one every 180 °.
And S102, calculating to obtain a second injection time length according to the injection parameters.
The second injection time length is the time length of the natural gas engine needing to be injected when the natural gas engine is injected at this time, namely the theoretical value of the time length of the natural gas engine needing to be injected when the natural gas engine is injected at this time.
Specifically, according to the injection advance angle included in the injection signal, the injection quantity required to be injected by the natural gas engine at this time is calculated to obtain the second injection time.
S103, judging whether the second injection time length is consistent with the first injection time length.
Specifically, if it is determined that the second injection period is greater than the first injection period, step 104 is executed.
In the specific implementation of the present embodiment, if the second injection period is longer than the first injection period, which indicates that the injection parameter in the injection signal acquired this time has changed, step 104 is executed.
Optionally, in another embodiment of the present invention, an implementation manner of step 103 further includes:
and if the second injection time length is judged to be less than or equal to the first injection time length, replacing the first injection time length in the injection signal with the second injection time length.
In the specific implementation process of this embodiment, if the second injection time period is less than or equal to the first injection time period, it indicates that the injection parameter in the injection signal acquired this time has changed; because the second injection time length is less than or equal to the first injection time length, the first injection time length in the injection signal only needs to be replaced by the second injection time length, and the injection time length of the natural gas engine in the injection next time is ensured to be the correct injection time length.
Optionally, in another embodiment of the present invention, before replacing the first injection period in the injection signal with the second injection period, as shown in fig. 2, the method further includes:
s201, judging whether an injection valve of the natural gas engine is opened or not;
specifically, if it is determined that the injection valve is being opened, step S202 is executed.
S202, closing the injection valve.
In the specific implementation process of the embodiment, since the second injection period is less than or equal to the first injection period, if the natural gas engine continues to inject, the injection quantity is greater than the injection quantity which should be injected, and at this time, the injection valve is closed, so that the injection quantity is more matched with the current working condition.
And S104, replacing the first injection time length in the injection signal with the second injection time length, and controlling the natural gas engine to inject in the third injection time length.
Wherein the third injection period is a difference between the second injection period and the first injection period.
Specifically, when it is determined in step S103 that the second injection period is longer than the first injection period, the calculated difference between the second injection period and the first injection period is used to obtain a period of time for which the injection amount is more matched with the current operating condition and the additional injection is required, that is, a third injection period.
Optionally, in another embodiment of the present invention, as shown in fig. 3, an implementation manner of step S104 includes:
and S301, replacing the first injection time length in the injection signal with the second injection time length.
In the specific implementation process of the embodiment, the first injection time length in the injection signal is replaced by the second injection time length, so that the injection time length of the next natural gas engine during injection is ensured to be the correct injection time length.
S302, calculating a difference value between the second injection duration and the first injection duration to obtain a third injection duration.
The second injection time length is the time length of the natural gas engine which needs to be injected when the natural gas engine is injected at this time, namely the theoretical value of the time length of the natural gas engine which needs to be injected when the natural gas engine is injected at this time; and the first injection period is the period of injection in the last cycle of the natural gas engine.
Specifically, the difference between the second injection duration and the first injection duration is obtained through calculation, and the obtained third injection duration is the injection duration of the natural gas engine needing to be subjected to supplementary injection in the current cycle.
And S303, calculating the time range of the third injection time period according to the injection position, the minimum injection interval and the injection preparation time period of the natural gas engine when the second injection time period is finished.
And the time length range of the third injection time length is the allowable injection time length range of the natural gas engine when the supplementary injection is carried out.
In a specific implementation of the embodiment of the present invention, the time length range of the third injection period may be calculated according to the injection position of the natural gas engine at the end of the second injection period, the minimum interval of injection, and the injection preparation period, and the time length range of the third injection period may be calculated.
S304, judging whether the third injection time length is in the time length range of the third injection time length.
Specifically, if it is determined that the third injection period is within the period range of the third injection period, which means that the third injection period is within the injection period range allowed when the natural gas engine performs the supplementary injection, step S305 is executed; and if the third injection duration is not within the duration range of the third injection duration, the natural gas engine does not perform supplementary injection in the current injection period.
And S305, controlling the natural gas engine to inject in a third injection period.
According to the scheme, in the control method for the injection of the natural gas engine, the injection signal is obtained; wherein the injection signal comprises: injection parameters and a first injection duration; calculating to obtain a second injection duration according to the injection parameters; judging whether the second injection time length is consistent with the first injection time length or not; if the second injection time length is judged to be longer than the first injection time length, replacing the first injection time length in the injection signal with the second injection time length, and controlling the natural gas engine to inject in a third injection time length; wherein the third injection period is a difference between the second injection period and the first injection period. And if the second injection duration is judged to be longer than the first injection duration, updating the second injection duration to the injection signal, and controlling the natural gas engine to inject in a third injection duration, so that the injection quantity is more matched with the current working condition, and the follow-up property of the excess air coefficient is improved.
An embodiment of the present invention provides a control device for natural gas engine injection, as shown in fig. 4, including:
an acquiring unit 401 for acquiring an injection signal.
Wherein, the injection signal comprises: injection parameters and a first injection period.
Optionally, in another embodiment of the present invention, an implementation manner of the obtaining unit 401 includes:
and the acquisition subunit is used for acquiring the injection signal for multiple times in one working cycle of the natural gas engine.
The interval between two adjacent times of acquiring the injection signals is a first preset interval.
Specifically, one working cycle of the natural gas engine is 720 °, in the implementation of the embodiment, the angular intervals of the multiple acquisition of the injection signals are the same, and the acquisition of the injection signals may be 180 °, but is not limited to one every 180 °.
And a first calculating unit 402, configured to calculate a second injection time period according to the injection parameter.
A first judgment unit 403 for judging whether the second injection period coincides with the first injection period.
The control unit 404 is configured to, if the first determination unit 403 determines that the second injection duration is longer than the first injection duration, replace the first injection duration in the injection signal with the second injection duration, and control the natural gas engine to inject within a third injection duration; wherein the third injection period is a difference between the second injection period and the first injection period.
For the specific working process of the unit disclosed in the above embodiment of the present invention, reference may be made to the content of the corresponding method embodiment, as shown in fig. 1, which is not described herein again.
Optionally, in another embodiment of the present invention, the control device for natural gas engine injection further includes:
and a second replacing unit configured to replace the first injection period in the injection signal with the second injection period if the first determining unit 403 determines that the second injection period is less than or equal to the first injection period.
Optionally, in another embodiment of the present invention, an implementation manner of the second replacement unit, as shown in fig. 5, further includes:
a third determination unit 501 is used to determine whether the injection valve of the natural gas engine is opening.
Specifically, if the first determination unit 403 determines that the second injection period is less than or equal to the first injection period, the determination unit 501 determines whether the injection valve of the natural engine is open.
A closing unit 502, configured to close the injection valve if the third determination unit 501 determines that the injection valve is opening.
In a specific implementation of the present embodiment, whether the determining unit 501 determines that the injection valve is opening or not, the second replacing unit is used to replace the first injection period in the injection signal with the second injection period.
For the specific working process of the unit disclosed in the above embodiment of the present invention, reference may be made to the content of the corresponding method embodiment, as shown in fig. 2, which is not described herein again.
Optionally, in another embodiment of the present invention, an implementation manner of the control unit 404, as shown in fig. 6, includes:
a first replacing unit 601 for replacing the first injection period in the injection signal with the second injection period.
The second calculating unit 602 is configured to calculate a difference between the second injection duration and the first injection duration, and obtain a third injection duration.
A third calculation unit 603 for calculating a range of the duration of the third injection period based on the injection position of the natural engine at the end of the second injection period, the minimum interval of injection and the injection preparation period.
A second determination unit 604 for determining whether the third injection period is within the period range of the third injection period.
And a control subunit 605, configured to control the natural gas engine to perform injection within the third injection period if the second determination unit 604 determines that the third injection period is within the period range of the third injection period.
For the specific working process of the unit disclosed in the above embodiment of the present invention, reference may be made to the content of the corresponding method embodiment, as shown in fig. 3, which is not described herein again.
According to the scheme, in the control injection device of the natural gas engine, the injection signal is acquired through the acquisition unit 401; wherein the injection signal comprises: injection parameters and a first injection duration; calculating a second injection time length according to the injection parameter through a first calculating unit 402; judging whether the second injection period coincides with the first injection period by a first judgment unit 403; if the third judging unit 403 judges that the second injection time length is longer than the first injection time length, replacing the first injection time length in the injection signal with the second injection time length through the control unit 404, and controlling the natural gas engine to inject within a third injection time length; wherein the third injection period is a difference between the second injection period and the first injection period. And if the second injection duration is judged to be longer than the first injection duration, updating the second injection duration to the injection signal, and controlling the natural gas engine to inject in a third injection duration, so that the injection quantity is more matched with the current working condition, and the follow-up property of the excess air coefficient is improved.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method of controlling injection in a natural gas engine, comprising:
acquiring an injection signal; wherein the injection signal comprises: injection parameters and a first injection duration; the first injection duration is the time of injection of the natural gas engine in the last period when the injection signal is obtained at this time;
calculating to obtain a second injection duration according to the injection parameters; the second injection time length is the time length of the natural gas engine needing to be injected when the natural gas engine is injected at this time;
judging whether the second injection time length is consistent with the first injection time length or not;
if the second injection time length is judged to be longer than the first injection time length, replacing the first injection time length in the injection signal with the second injection time length, and controlling the natural gas engine to inject in a third injection time length; wherein the third injection period is a difference between the second injection period and the first injection period.
2. The method of claim 1, wherein said obtaining an injection signal comprises:
acquiring the injection signal a plurality of times within one working cycle of the natural gas engine; and the interval between two adjacent times of acquiring the injection signals is a first preset interval.
3. The method of claim 1 wherein said replacing said second injection period for said first injection period in said injection signal and controlling said natural gas engine to inject for a third injection period comprises:
replacing the second injection period for the first injection period in the injection signal;
calculating the difference value between the second injection time length and the first injection time length to obtain a third injection time length;
calculating the time range of the third injection time period according to the injection position of the natural gas engine, the minimum injection interval and the injection preparation time period when the second injection time period is finished;
judging whether the third injection time length is within the time length range of the third injection time length;
and if the third injection duration is judged to be within the duration range of the third injection duration, controlling the natural gas engine to inject within the third injection duration.
4. The method of claim 1, further comprising:
and if the second injection time length is judged to be less than or equal to the first injection time length, replacing the first injection time length in the injection signal with the second injection time length.
5. The method of claim 4, wherein said replacing said second injection period for said first injection period in said injection signal further comprises:
judging whether an injection valve of the natural gas engine is opening;
and if the injection valve is judged to be opened, closing the injection valve.
6. A control apparatus for natural gas engine injection, comprising:
an acquisition unit configured to acquire an injection signal; wherein the injection signal comprises: injection parameters and a first injection duration; the first injection duration is the time of injection of the natural gas engine in the last period when the injection signal is obtained at this time;
the first calculating unit is used for calculating a second injection duration according to the injection parameters; the second injection time length is the time length of the natural gas engine needing to be injected when the natural gas engine is injected at this time;
a first judgment unit configured to judge whether the second injection period is consistent with the first injection period;
the control unit is used for replacing the first injection duration in the injection signal with the second injection duration and controlling the natural gas engine to inject within a third injection duration if the second injection duration is longer than the first injection duration and judged by the first judging unit; wherein the third injection period is a difference between the second injection period and the first injection period.
7. The apparatus of claim 6, wherein the obtaining unit comprises:
an acquisition subunit configured to acquire the injection signal a plurality of times within one working cycle of the natural gas engine; and the interval between two adjacent times of acquiring the injection signals is a first preset interval.
8. The apparatus of claim 6, wherein the control unit comprises:
a first replacement unit configured to replace the first injection period in the injection signal with the second injection period;
the second calculation unit is used for calculating the difference value between the second injection time length and the first injection time length to obtain a third injection time length;
a third calculating unit, configured to calculate a time length range of the third injection time length according to the injection position, the minimum injection interval, and the injection preparation time length of the natural gas engine at the end of the second injection time length;
a second determination unit configured to determine whether the third injection period is within a period range of the third injection period;
and the control subunit is configured to control the natural gas engine to inject within the third injection period if the third injection period is within the period range of the third injection period as determined by the second determination unit.
9. The apparatus of claim 6, further comprising:
and the second replacing unit is used for replacing the first injection time length in the injection signal with the second injection time length if the first judging unit judges that the second injection time length is less than or equal to the first injection time length.
10. The apparatus of claim 9, further comprising:
a third judgment unit for judging whether an injection valve of the natural gas engine is opening;
and the closing unit is used for closing the injection valve if the third judging unit judges that the injection valve is opened.
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| CN111102093B (en) * | 2019-12-13 | 2022-04-26 | 潍柴动力股份有限公司 | Method and system for improving injection quantity control precision of natural gas engine |
| CN113153554B (en) * | 2021-05-07 | 2023-01-20 | 潍柴动力股份有限公司 | Method, device and system for controlling natural gas injection during sudden load unloading of engine |
| CN113431693B (en) * | 2021-08-05 | 2023-01-20 | 潍柴动力股份有限公司 | Control method for transient working condition of engine, engine and engineering machinery |
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| CN110273773A (en) | 2019-09-24 |
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