CN113153554B - Method, device and system for controlling natural gas injection during sudden load unloading of engine - Google Patents
Method, device and system for controlling natural gas injection during sudden load unloading of engine Download PDFInfo
- Publication number
- CN113153554B CN113153554B CN202110494887.4A CN202110494887A CN113153554B CN 113153554 B CN113153554 B CN 113153554B CN 202110494887 A CN202110494887 A CN 202110494887A CN 113153554 B CN113153554 B CN 113153554B
- Authority
- CN
- China
- Prior art keywords
- injection
- natural gas
- cylinder
- injected
- parameters
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Abstract
The invention discloses a method, a device and a system for controlling natural gas injection during sudden load shedding of an engine, wherein the control method comprises the following steps: A. calculating preset injection parameters of the cylinder to be injected; B. calculating residual injection parameters corresponding to residual injected natural gas of each cylinder injecting natural gas; C. comparing preset injection parameters of the cylinder to be injected with the residual injection parameters of the cylinders which are injecting the natural gas; D. and D, judging whether the residual injection parameters of the cylinder which is injecting the natural gas are equal to the preset injection parameters of the cylinder to be injected or not, if so, returning the injection parameters of the cylinder to be injected to zero, and if not, updating the injection parameters of the cylinder to be injected to the preset injection parameters obtained by calculation in the step A. The control method of the natural gas injection during the sudden load unloading of the engine can effectively improve the conditions of over-rich air-fuel ratio and poor transient responsiveness during the sudden load unloading of the engine.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a method, a device and a system for controlling natural gas injection during sudden load shedding of an engine.
Background
The natural gas engine is an air inlet channel injection mode, a large crank angle is required to be formed between the calculation of injection parameters such as injection electrification time, injection advance angle and the like and the ignition near a compression top dead center, and the injection electrification time is long. In the prior art, the updating of the injection parameters per cylinder is largely advanced by one working cycle with respect to the compression top dead center of the cylinder and is updated only once in this interval. If the condition abrupt decrease is detected after the injection parameter calculation is completed, since the injection parameter update performed before the abrupt decrease is completed, the injection quantity is still performed according to the injection energization time calculated before the condition change, resulting in poor air-fuel ratio following performance, poor transient response, and even possibility of misfire.
Disclosure of Invention
In view of the above, a first object of the present invention is to provide a method for controlling natural gas injection during engine dump load, which can effectively improve the conditions of over-rich air-fuel ratio and poor transient response during load dump, and a second object of the present invention is to provide a device and a system for controlling natural gas injection during engine dump load.
In order to achieve the first object, the present invention provides the following technical solutions:
a method for controlling natural gas injection during sudden load release of an engine comprises the following steps:
A. calculating preset injection parameters of a cylinder to be injected;
B. calculating residual injection parameters corresponding to residual injected natural gas of each cylinder injecting natural gas;
C. comparing preset injection parameters of the cylinder to be injected with the residual injection parameters of the cylinders which are injecting the natural gas;
D. and D, judging whether the residual injection parameters of the cylinder which is injecting the natural gas are equal to the preset injection parameters of the cylinder to be injected or not, if so, returning the injection parameters of the cylinder to be injected to zero, and if not, updating the injection parameters of the cylinder to be injected to the preset injection parameters obtained by calculation in the step A.
Preferably, in the method for controlling natural gas injection during engine dump load, the step B is:
the difference value between the actual injection parameter of the cylinder injecting the natural gas and the injection parameter corresponding to the natural gas which is injected is the residual injection parameter.
Preferably, in the method for controlling natural gas injection during engine dump load, the injection parameters include n unit parameters, and if the number of unit parameters included in the remaining injection parameters is equal to the number of unit parameters included in the preset injection parameters, the remaining injection parameters are equal to the preset injection parameters.
Preferably, in the above method for controlling natural gas injection during engine load dump, the unit parameter is a preset protruding shaft rotation angle or a preset power-on time period.
Preferably, in the above method for controlling natural gas injection during engine dump load, the injection parameter is injection power-on time.
Preferably, the method for controlling natural gas injection during a load dump of an engine further includes, before step a, step A0: judging whether the load of the engine is suddenly unloaded; the engine load dump is specifically that the engine load drops below a preset percentage within a preset time period.
A control apparatus for natural gas injection during a sudden load dump of an engine, comprising:
the first calculation unit is used for calculating preset injection parameters of the cylinder to be injected;
the second calculation unit is used for calculating residual injection parameters corresponding to residual injected natural gas of each cylinder which is injecting natural gas;
the comparison unit is used for comparing preset injection parameters of the cylinder to be injected with the residual injection parameters of the cylinders which are injecting the natural gas;
the judging unit is used for obtaining the comparison result of the comparing unit and judging whether the residual injection parameters of the cylinder which is injecting the natural gas are equal to the preset injection parameters of the cylinder to be injected or not;
and the control unit is used for acquiring the judgment result of the judgment unit, returning the injection parameter of the cylinder to be injected to zero if the judgment result shows that the cylinder is in the zero state, and updating the injection parameter of the cylinder to be injected to the preset injection parameter calculated by the first calculation unit if the judgment result shows that the cylinder is not in the zero state.
Preferably, in the above control apparatus for natural gas injection during engine dump load, the second calculation unit is configured to calculate a difference between an actual injection parameter of each cylinder in which natural gas is being injected and an injection parameter corresponding to natural gas that has been injected as the remaining injection parameter.
Preferably, in the control device for natural gas injection during a load dump of the engine, the injection parameter includes n unit parameters, and if the number of unit parameters included in the remaining injection parameter is equal to the number of unit parameters included in the preset injection parameter, the remaining injection parameter is equal to the preset injection parameter.
A system for controlling natural gas injection during engine dump load, comprising:
a plurality of cylinders of an engine;
the controller is used for calculating preset injection parameters of the cylinders to be injected and calculating residual injection parameters corresponding to residual injected natural gas of the cylinders which are injecting the natural gas; comparing preset injection parameters of the cylinder to be injected with the residual injection parameters of the cylinders which are injecting the natural gas; obtaining a comparison result of the comparison unit, and judging whether the residual injection parameters of the cylinder which is injecting the natural gas are equal to the preset injection parameters of the cylinder to be injected or not; if the judgment result shows that the preset injection parameters are zero, the injection parameters of the cylinder to be injected are updated to the preset injection parameters calculated by the first calculating unit.
When the control method, the device and the system for natural gas injection during load dump of the engine provided by the invention are applied, when the preset injection parameters are calculated by each cylinder, the residual injection parameters of the cylinder which is being injected are counted, then the preset injection parameters required by the current cylinder are compared with the residual injection parameters of a plurality of cylinders which are being injected, if the residual injection parameters of the cylinder which is being injected are equal to the preset injection parameters required by the current cylinder, the injection parameters required by the current cylinder return to zero, otherwise, the preset injection parameters required by the current cylinder are updated to the injection parameters. So adopt disconnected mode of spraying, reduce the gas volume, let the natural gas injection volume more match current operating mode, can effectively improve the condition that air-fuel ratio is too strong and transient response nature is poor, improve air-fuel ratio control accuracy simultaneously.
In addition, the scheme provided by the invention does not need to be additionally provided with any equipment, the air-fuel ratio control precision can be improved on the basis of the existing engine and whole vehicle configuration, the cost is saved, and the reliability meets the actual use requirement.
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 embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a method for controlling natural gas injection during a load dump of an engine according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for controlling natural gas injection during a sudden engine load drop according to another embodiment of the present disclosure;
fig. 3 is a schematic diagram of a control device for natural gas injection during a load dump of an engine according to an embodiment of the present invention.
Detailed Description
The first purpose of the invention is to provide a control method of natural gas injection during load dump of an engine, which can effectively improve the conditions of over-rich air-fuel ratio and poor transient response during load dump, and the second purpose of the invention is to provide a control device and a control system of natural gas injection during load dump of the engine.
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.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left" and "right", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the positions or elements referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus are not to be construed as limitations of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, a first embodiment of the present invention provides a method for controlling natural gas injection during a load dump of an engine, comprising the steps of:
s1: and calculating preset injection parameters of the cylinder to be injected.
The step may specifically be: when the number of the cylinders to be injected is multiple, calculating a preset injection parameter of any one cylinder to be injected in the multiple cylinders to be injected; when the number of the cylinders to be injected is one, the preset injection parameters of the cylinders to be injected are calculated. The injection parameter may be indicative of an injection amount of natural gas injected by the cylinder.
The natural gas is injected into a plurality of cylinders of the engine in sequence, and when the preset injection parameters of the plurality of cylinders are calculated, the preset injection parameters of the plurality of cylinders are calculated one by one according to the sequence.
For example, the engine is a six-cylinder engine, when the engine is in a load dump state, 2 cylinders, 1 cylinder, 6 cylinders, 5 cylinders and 4 cylinders are injecting, 3 cylinders are cylinders to be injected, and preset injection parameters of the 3 cylinders are calculated.
And S2, calculating the residual injection parameters corresponding to the residual injected natural gas of each cylinder in which the natural gas is injected.
And respectively calculating residual injection parameters corresponding to residual natural gas injection amounts of the plurality of cylinders injecting the natural gas. The remaining injected natural gas of the natural gas injecting cylinder refers to the difference between the total amount of the natural gas expected to be injected and the amount of the natural gas already injected, and the remaining injected natural gas of the natural gas injecting cylinder refers to the amount of the natural gas not yet injected by the natural gas injecting cylinder, and the amount of the natural gas not yet injected by the natural gas injecting cylinder will continue to be injected after the step S2 until the natural gas injecting cylinder injects the preset natural gas injection amount.
For example, the engine is a six-cylinder engine, and when the engine is unloaded suddenly, the 2 cylinders, 1 cylinder, 6 cylinders, 5 cylinders and 4 cylinders are injecting, and the residual injection parameters of the 2 cylinders, 1 cylinder, 6 cylinders, 5 cylinders and 4 cylinders are calculated.
And S3, comparing the preset injection parameters of the cylinder to be injected with the residual injection parameters of the cylinders which are injecting the natural gas.
And (3) comparing the preset injection parameters of the cylinder to be injected calculated in the step (S1) with the residual injection parameters of the cylinders which are injecting the natural gas respectively.
For example, the calculated preset injection parameters for 3 cylinders are compared with the remaining injection parameters for 2 cylinders, 1 cylinder, 6 cylinders, 5 cylinders and 4 cylinders, respectively.
And S4, judging whether the residual injection parameters of the cylinder which is injecting the natural gas are equal to the preset injection parameters of the cylinder to be injected or not, if so, entering the step S51, and if not, entering the step S52.
And S51, returning the injection parameters of the cylinder to be injected to zero.
When the residual injection parameters of the cylinder which is injecting the natural gas are equal to the preset injection parameters of the cylinder to be injected, the injection parameters of the cylinder to be injected return to zero, the cylinder to be injected stops injecting once, and the requirement of the cylinder to be injected is met by the residual injection parameters of the cylinder which is injecting the natural gas.
In this step, the injection parameters of the cylinder that is injecting natural gas, equal to the preset injection parameters of the cylinder to be injected, are also zeroed. When the residual injection parameters of a plurality of cylinders which are injecting natural gas are equal to the preset injection parameters of the cylinders to be injected, the injection parameter of one cylinder which is injecting natural gas is only required to be reset to zero.
And S52, if not, updating the injection parameters of the cylinder to be injected into the preset injection parameters calculated in the step S1.
And when the residual injection parameters of the cylinder which is injecting the natural gas are not equal to the preset injection parameters of the cylinder to be injected, updating the injection parameters of the cylinder to be injected into the preset injection parameters obtained by calculation in the step S1, and executing next injection of the cylinder to be injected according to the updated injection parameters.
For example, if the remaining injection parameters of 4 cylinders are equal to the preset injection parameters of 3 cylinders, the injection parameters of 3 cylinders are reset to zero, and the 3 cylinders stop injecting once. And if the rest injection parameters of the 2 cylinders, the 1 cylinder, the 6 cylinders, the 5 cylinders and the 4 cylinders are not equal to the preset injection parameters of the 3 cylinders, updating the injection parameters of the 3 cylinders into the preset injection parameters calculated in the step S1, and executing the next injection of the 3 cylinders according to the updated injection parameters.
When the control method of natural gas injection during load dump of the engine provided by the invention is applied, when the preset injection parameters are calculated by each cylinder, the residual injection parameters of the cylinder which is being injected are counted, then the preset injection parameters required by the current cylinder are compared with the residual injection parameters of a plurality of cylinders which are being injected, if the residual injection parameters of the cylinder which is being injected are equal to the preset injection parameters required by the current cylinder, the injection parameters required by the current cylinder return to zero, otherwise, the preset injection parameters required by the current cylinder are updated to the injection parameters. The mode of disconnected injection is so adopted, the gas volume is reduced, the natural gas injection volume is more matched with the current working condition, the conditions of over-rich air-fuel ratio and poor transient response can be effectively improved, and the air-fuel ratio control precision is improved.
In addition, the method provided by the invention does not need to be additionally provided with any equipment, can improve the air-fuel ratio control precision on the basis of the existing engine and whole vehicle configuration, saves the cost, and meets the actual use requirement in reliability.
In the first embodiment, after steps S51 and S52, step S1 is repeated to realize that the steps are executed when the preset injection parameter of each cylinder to be injected is calculated.
In the above embodiment, in step S2, the difference between the actual injection parameter of the cylinder that is injecting natural gas and the injection parameter corresponding to the natural gas that it has injected is the remaining injection parameter. The actual injection parameter is used for indicating the predicted total injected natural gas amount of the cylinder in which the natural gas is being injected, and the predicted total injected natural gas amount is the sum of the amount of the already injected natural gas and the amount of the unexjected natural gas. The remaining injection parameter is indicative of an amount of natural gas that has not been injected by the cylinder that is injecting natural gas.
In one embodiment, the injection parameters include n unit parameters, and the number of the unit parameters included in the remaining injection parameters is equal to the number of the unit parameters included in the preset injection parameter, and then the remaining injection parameters are equal to the preset injection parameter.
Further, the unit parameter is a preset protruding shaft rotation angle or a preset power-on time period.
For example, the preset rotation angle of the cam shaft is 120 degrees of rotation of the cam shaft, and the injection parameters including n unit parameters refer to n × 120 degrees of rotation of the cam. For example, the injection parameters of 3 cylinders are that 2 convex shafts rotate 120 degrees, 3 cylinders rotate 240 degrees from the beginning of injecting natural gas to the stopping of injection, if 3 cylinders start injection when the convex shafts are located at 0 degrees, and 3 cylinders stop injecting natural gas when the convex shafts rotate 240 degrees. Therefore, the natural gas valve of the cylinder is controlled to be opened and closed according to the position of the convex shaft, and the control is convenient.
In another embodiment, for example, the preset power-up period is 2s, and the injection parameter includes n unit parameters, i.e., the power-up time is n × 2s. For example, the injection parameters of 3 cylinders are 2 preset energization periods, and the energization time of 3 cylinders is 2 × 2s =4s. Therefore, the natural gas valve of the cylinder is controlled to be opened and closed according to the injection time, and the control is convenient.
Of course, the injection parameter may also be the injection power-up time, which is also convenient for calculation.
As shown in fig. 2, a second embodiment of the present invention provides another control method for natural gas injection during engine dump load, which adds step S0 to the first embodiment, and the rest steps are the same as the first embodiment.
And S0, judging whether the engine load is suddenly unloaded.
The above-described steps S1 to S52 are executed only in the case where the engine load is suddenly removed, and therefore it is possible to detect whether the engine load is suddenly removed to proceed to steps S1 to S52.
The sudden engine load unloading is that the engine load drops below a preset percentage in a preset time period. For example, the engine load dump is specifically that the engine load is reduced to below 50% within 5s, and the preset time period and the preset percentage can be set according to the actual situation.
In this embodiment, step S0 is repeated after steps S51 and S52.
In a practical application process, the engine is a six-cylinder engine, when the engine is suddenly unloaded, 2 cylinders, 1 cylinder, 6 cylinders, 5 cylinders and 4 cylinders are injecting, 3 cylinders are cylinders to be injected, and the required unit parameter number of the 3 cylinders is calculated. And calculating the number of the residual unit parameters of 2 cylinders, 1 cylinder, 6 cylinders, 5 cylinders and 4 cylinders. The required unit parameter number of 3 cylinders is compared with the residual unit parameter numbers of 2 cylinders, 1 cylinder, 6 cylinders, 5 cylinders and 4 cylinders respectively. And if the number of the residual unit parameters of the 4 cylinders is equal to that of the unit parameters required by the 3 cylinders, the injection parameters of the 3 cylinders are reset to zero, and the 3 cylinders stop injecting once. If the rest injection parameters of the 2 cylinders, the 1 cylinder, the 6 cylinders, the 5 cylinders and the 4 cylinders are not equal to the preset injection parameters of the 3 cylinders, the injection parameters of the 3 cylinders are updated to the required unit parameter number, and the next injection of the 3 cylinders is executed according to the updated injection parameters.
As shown in fig. 3, the present invention further provides a control device for natural gas injection during engine load dump, comprising a first calculating unit, a second calculating unit, a comparing unit, a judging unit and a control unit.
The first calculation unit is used for calculating preset injection parameters of a cylinder to be injected. The second calculating unit is used for calculating the residual injection parameters corresponding to the residual injected natural gas of each cylinder which is injecting the natural gas.
When the number of the cylinders to be injected is multiple, the first calculating unit calculates the preset injection parameters of any one cylinder to be injected in the multiple cylinders to be injected; when the number of the cylinders to be injected is one, the first calculation unit calculates the preset injection parameters of the cylinders to be injected. The injection parameter may be indicative of an injection amount of natural gas injected by the cylinder. The multiple cylinders of the engine are used for injecting natural gas in sequence, and when the first calculating unit calculates the preset injection parameters of the multiple cylinders, the preset injection parameters of the multiple cylinders are calculated one by one according to the sequence.
The second calculating unit respectively calculates residual injection parameters corresponding to residual natural gas injection amounts of a plurality of cylinders injecting natural gas. The residual sprayed natural gas of the natural gas spraying cylinder refers to the difference between the total amount of the natural gas expected to be sprayed and the amount of the natural gas already sprayed, and the residual sprayed natural gas of the natural gas spraying cylinder refers to the amount of the natural gas not yet sprayed by the natural gas spraying cylinder, and the amount of the natural gas not yet sprayed by the natural gas spraying cylinder continues to be sprayed until the natural gas spraying cylinder sprays the preset natural gas spraying amount.
The comparison unit is used for comparing the preset injection parameters of the cylinder to be injected with the residual injection parameters of each cylinder in which the natural gas is injected. And the judging unit is used for acquiring the comparison result of the comparing unit and judging whether the residual injection parameters of the cylinder which is injecting the natural gas are equal to the preset injection parameters of the cylinder to be injected. The control unit is used for obtaining the judgment result of the judgment unit, returning the injection parameter of the cylinder to be injected to zero if the judgment result shows that the cylinder is in the zero state, and updating the injection parameter of the cylinder to be injected to the preset injection parameter calculated by the first calculation unit if the judgment result shows that the cylinder is not in the zero state.
And comparing the preset injection parameters of the cylinder to be injected, which are calculated by the first calculating unit, with the residual injection parameters of the cylinders which are injecting the natural gas, which are calculated by the second calculating unit. When the judging unit obtains that the residual injection parameters of the cylinder which is injecting the natural gas are equal to the preset injection parameters of the cylinder to be injected, the control unit controls the injection parameters of the cylinder to be injected to return to zero, and the cylinder to be injected stops injecting once, so that the requirement of the cylinder to be injected is met by the residual injection parameters of the cylinder which is injecting the natural gas. When the judging unit obtains that the residual injection parameters of the cylinder which is injecting the natural gas are not equal to the preset injection parameters of the cylinder to be injected, the injection parameters of the cylinder to be injected are controlled to be updated to the preset injection parameters calculated by the first calculating unit, and the next injection of the cylinder to be injected is executed according to the updated injection parameters.
When the judging unit obtains that the residual injection parameters of the cylinder which is injecting the natural gas are equal to the preset injection parameters of the cylinder to be injected, the control unit controls the injection parameters of the cylinder to be injected to return to zero, and simultaneously controls the injection parameters of the cylinder which is injecting the natural gas and is equal to the preset injection parameters of the cylinder to be injected to return to zero.
In a specific embodiment, the second calculating unit is used for calculating the difference value between the actual injection parameter of each cylinder injecting natural gas and the injection parameter corresponding to the natural gas which is injected by the cylinder, and the difference value is the residual injection parameter. The actual injection parameter is used to indicate a total expected injected natural gas quantity for the cylinder in which natural gas is being injected, which is the sum of the quantity of already injected natural gas and the quantity of unexjected natural gas. The remaining injection parameter is indicative of an amount of natural gas that has not been injected by the cylinder that is injecting natural gas.
In one embodiment, the injection parameters include n unit parameters, and the number of unit parameters included in the remaining injection parameters is equal to the number of unit parameters included in the preset injection parameters, and then the remaining injection parameters are equal to the preset injection parameters.
Further, the unit parameter is a preset protruding shaft rotation angle or a preset power-on time period.
For example, the preset rotation angle of the convex shaft is 120 degrees of rotation of the convex shaft, and the injection parameters including n unit parameters refer to n × 120 degrees of rotation of the cam. For example, the injection parameters of 3 cylinders are that 2 convex shafts rotate 120 degrees, 3 cylinders rotate 240 degrees from the beginning of injecting natural gas to the stop of injecting, if 3 cylinders start injecting when the convex shafts are located at 0 degrees, and 3 cylinders stop injecting natural gas when the convex shafts rotate 240 degrees. Therefore, the natural gas valve of the cylinder can be controlled to be opened or closed according to the position of the convex shaft, and the control is convenient.
In another embodiment, for example, the preset power-up period is 2s, and the injection parameter includes n unit parameters, i.e., the power-up time is n × 2s. For example, the injection parameters of 3 cylinders are 2 preset energization periods, and the energization time of 3 cylinders is 2 × 2s =4s. Therefore, the natural gas valve of the cylinder is controlled to be opened and closed according to the injection time, and the control is convenient.
Of course, the injection parameter may also be the injection power-on time, which is also convenient for calculation.
The control device for the natural gas injection during the sudden load unloading of the engine can also comprise a detection unit, and the detection unit is used for judging whether the engine load is suddenly unloaded.
The sudden engine load unloading is that the engine load drops below a preset percentage in a preset time period. For example, the engine load dump is specifically that the engine load is reduced to below 50% within 5s, and the preset time period and the preset percentage can be set according to actual conditions.
The invention also provides a control system for natural gas injection during sudden load unloading of the engine, which comprises a plurality of cylinders of the engine and a controller.
The controller is used for calculating preset injection parameters of the cylinder to be injected and calculating residual injection parameters corresponding to residual injected natural gas of each cylinder which is injecting natural gas; comparing preset injection parameters of the cylinder to be injected with the residual injection parameters of the cylinders which are injecting natural gas; obtaining a comparison result of the comparison unit, and judging whether the residual injection parameters of the cylinder which is injecting the natural gas are equal to the preset injection parameters of the cylinder to be injected or not; if the judgment result shows that the preset injection parameters are zero, the injection parameters of the cylinder to be injected are updated to the preset injection parameters calculated by the first calculating unit.
When the control device and the control system for natural gas injection during load dump of the engine provided by the invention are applied, when the preset injection parameters are calculated by each cylinder, the residual injection parameters of the cylinder which is being injected are counted, then the preset injection parameters required by the current cylinder are compared with the residual injection parameters of a plurality of cylinders which are being injected, if the residual injection parameters of the cylinder which is being injected are equal to the preset injection parameters required by the current cylinder, the injection parameters required by the current cylinder are returned to zero, and otherwise, the preset injection parameters required by the current cylinder are updated to the injection parameters. The mode of disconnected injection is so adopted, the gas volume is reduced, the natural gas injection volume is more matched with the current working condition, the conditions of over-rich air-fuel ratio and poor transient response can be effectively improved, and the air-fuel ratio control precision is improved. In addition, the air-fuel ratio control precision can be improved on the basis of the existing engine and whole vehicle configuration, the cost is saved, and the reliability meets the actual use requirement.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
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.
In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (9)
1. A method for controlling natural gas injection during engine dump load, comprising the steps of:
A. calculating preset injection parameters of a cylinder to be injected;
B. calculating residual injection parameters corresponding to residual injected natural gas of each cylinder which is injecting natural gas;
C. comparing preset injection parameters of the cylinder to be injected with the residual injection parameters of the cylinders which are injecting the natural gas;
D. b, judging whether the residual injection parameters of the cylinder which is injecting the natural gas are equal to the preset injection parameters of the cylinder to be injected or not, if so, returning the injection parameters of the cylinder to be injected to zero, otherwise, updating the injection parameters of the cylinder to be injected to the preset injection parameters calculated in the step A;
wherein the injection parameter indicates an injection amount of the cylinder to inject the natural gas.
2. The method for controlling natural gas injection during a load dump of an engine according to claim 1, wherein in step B:
the difference between the actual injection parameter of the cylinder which is injecting natural gas and the injection parameter corresponding to the natural gas which it has injected is the remaining injection parameter.
3. The method according to claim 1, wherein the injection parameters include n unit parameters, and the number of unit parameters included in the remaining injection parameters is equal to the number of unit parameters included in the preset injection parameters, and the remaining injection parameters are equal to the preset injection parameters; the unit parameter is a preset protruding shaft rotation angle or a preset power-on time period.
4. The method of controlling natural gas injection during a load dump of an engine as set forth in claim 1, wherein the injection parameter is injection on-time.
5. The method for controlling natural gas injection during a load dump of an engine according to claim 1, characterized by further comprising, before step a, step A0: judging whether the load of the engine is suddenly unloaded; the engine load dump is specifically that the engine load is reduced to be lower than a preset percentage in a preset time period.
6. A control apparatus for natural gas injection during a sudden load dump of an engine, comprising:
the first calculation unit is used for calculating preset injection parameters of the cylinder to be injected;
the second calculation unit is used for calculating residual injection parameters corresponding to residual injected natural gas of each cylinder which is injecting natural gas;
the comparison unit is used for comparing preset injection parameters of the cylinder to be injected with the residual injection parameters of the cylinders which are injecting the natural gas;
the judging unit is used for obtaining the comparison result of the comparing unit and judging whether the residual injection parameters of the cylinder which is injecting the natural gas are equal to the preset injection parameters of the cylinder to be injected or not;
the control unit is used for acquiring the judgment result of the judgment unit, returning the injection parameter of the cylinder to be injected to zero if the judgment result shows that the judgment result does not show that the judgment result shows that the injection parameter of the cylinder to be injected is updated to the preset injection parameter calculated by the first calculation unit;
wherein the injection parameter indicates an injection amount of the cylinder to inject the natural gas.
7. The control apparatus of natural gas injection during engine dump load according to claim 6, characterized in that the second calculation unit is configured to calculate, as the remaining injection parameter, a difference between an actual injection parameter of each cylinder that is injecting natural gas and an injection parameter corresponding to natural gas that it has injected.
8. The apparatus for controlling injection of natural gas during a load dump of an engine as defined in claim 6, wherein the injection parameters include n unit parameters, and the number of unit parameters included in the remaining injection parameters is equal to the number of unit parameters included in the preset injection parameters, and then the remaining injection parameters are equal to the preset injection parameters; the unit parameter is a preset protruding shaft rotation angle or a preset power-on time period.
9. A system for controlling natural gas injection during a sudden load dump of an engine, comprising:
a plurality of cylinders of the engine;
the controller is used for calculating preset injection parameters of the cylinders to be injected and calculating residual injection parameters corresponding to residual injected natural gas of the cylinders which are injecting the natural gas; comparing preset injection parameters of the cylinder to be injected with the residual injection parameters of the cylinders which are injecting the natural gas; judging whether the residual injection parameters of the cylinder which is injecting the natural gas are equal to the preset injection parameters of the cylinder to be injected or not; if the judgment result shows that the air cylinder to be sprayed is zero, the air cylinder to be sprayed is updated to the preset spraying parameter calculated by the first calculating unit if the judgment result shows that the air cylinder to be sprayed is not zero;
wherein the injection parameter indicates an injection amount of the natural gas injected by the cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110494887.4A CN113153554B (en) | 2021-05-07 | 2021-05-07 | Method, device and system for controlling natural gas injection during sudden load unloading of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110494887.4A CN113153554B (en) | 2021-05-07 | 2021-05-07 | Method, device and system for controlling natural gas injection during sudden load unloading of engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113153554A CN113153554A (en) | 2021-07-23 |
| CN113153554B true CN113153554B (en) | 2023-01-20 |
Family
ID=76873871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110494887.4A Active CN113153554B (en) | 2021-05-07 | 2021-05-07 | Method, device and system for controlling natural gas injection during sudden load unloading of engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113153554B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63129141A (en) * | 1986-11-18 | 1988-06-01 | Nissan Motor Co Ltd | Fuel injection control device for internal combustion engine |
| CN1641198A (en) * | 2004-01-16 | 2005-07-20 | 丰田自动车株式会社 | Fuel injection control device for internal combustion engine |
| GB201101567D0 (en) * | 2011-01-28 | 2011-03-16 | Gm Global Tech Operations Inc | Method for operating a diesel/natural-gas internal combustion engine |
| CN106677910A (en) * | 2015-11-06 | 2017-05-17 | 福特环球技术公司 | Method and system for double-fuel jet |
| CN110273773A (en) * | 2019-06-29 | 2019-09-24 | 潍柴动力股份有限公司 | The control method and device of natural gas engine injection |
-
2021
- 2021-05-07 CN CN202110494887.4A patent/CN113153554B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63129141A (en) * | 1986-11-18 | 1988-06-01 | Nissan Motor Co Ltd | Fuel injection control device for internal combustion engine |
| CN1641198A (en) * | 2004-01-16 | 2005-07-20 | 丰田自动车株式会社 | Fuel injection control device for internal combustion engine |
| GB201101567D0 (en) * | 2011-01-28 | 2011-03-16 | Gm Global Tech Operations Inc | Method for operating a diesel/natural-gas internal combustion engine |
| CN106677910A (en) * | 2015-11-06 | 2017-05-17 | 福特环球技术公司 | Method and system for double-fuel jet |
| CN110273773A (en) * | 2019-06-29 | 2019-09-24 | 潍柴动力股份有限公司 | The control method and device of natural gas engine injection |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113153554A (en) | 2021-07-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7305972B2 (en) | Method of controlling an internal combustion engine | |
| CN101377169B (en) | Fuel injection system with learning control to compensate for actual-to-target injection quantity | |
| EP1340900B1 (en) | Fuel injection control system for engine | |
| US6810858B2 (en) | Fuel injection timing control apparatus and control method thereof for in-cylinder injection gasoline engine | |
| CN103080518B (en) | Internal combustion engine diagnostic device and internal combustion engine diagnosis method | |
| CN102278221B (en) | Control device for in-cylinder fuel injection type internal combustion engine | |
| CN101128663B (en) | Method for determining fuel volatility and consequently performing cold starting of an internal combustion engine | |
| RU2568373C2 (en) | Diagnostics of fuel injectors | |
| KR100444535B1 (en) | Fuel injection control apparatus for a diesel engine | |
| DE102008038102B4 (en) | Method for preventing a pre-ignition of a fuel-air mixture in a cylinder chamber of a high compression ratio internal combustion engine operated by an internal combustion engine | |
| CN104603435B (en) | The control device of electromotor and control method | |
| US20120265424A1 (en) | Method for the open-loop control and closed-loop control of an internal combustion engine | |
| CN101449044A (en) | Fuel injection control apparatus and fuel injection control method for internal combustion engine | |
| DE102013113645A1 (en) | Method and device for operating an internal combustion engine using an intake air compressor | |
| CN106065823B (en) | Fuel injection control system and fuel injection control device for internal combustion engine | |
| CN108757253B (en) | Method for judging consistency of oil injectors | |
| CN105464824A (en) | Fuel pressure sensor abnormality diagnosis apparatus for internal combustion engine | |
| DE10115736A1 (en) | Fuel injection control system for an internal combustion engine | |
| US20050005903A1 (en) | Start-up control of in-cylinder fuel injection spark ignition internal combustion engine | |
| DE102006000450A1 (en) | Control of an internal combustion engine | |
| CN111237072B (en) | Electronic control diesel engine nozzle fault identification method and system and electronic control unit | |
| CN112922733A (en) | Vehicle first-time exhaust starting control method, device and equipment | |
| CN113153554B (en) | Method, device and system for controlling natural gas injection during sudden load unloading of engine | |
| CN111636969B (en) | Oil and gas supply control method and system for two-stroke dual-fuel engine | |
| CN101466930B (en) | Method and device for controlling fuel metering into at least one combustion chamber of internal combustion engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |