CN117722286A - Hydrogen fuel engine and tumble flow adjusting method thereof - Google Patents
Hydrogen fuel engine and tumble flow adjusting method thereof Download PDFInfo
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- CN117722286A CN117722286A CN202410179434.6A CN202410179434A CN117722286A CN 117722286 A CN117722286 A CN 117722286A CN 202410179434 A CN202410179434 A CN 202410179434A CN 117722286 A CN117722286 A CN 117722286A
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- 239000001257 hydrogen Substances 0.000 title claims abstract description 260
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 260
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 259
- 239000000446 fuel Substances 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000002347 injection Methods 0.000 claims abstract description 58
- 239000007924 injection Substances 0.000 claims abstract description 58
- 230000001276 controlling effect Effects 0.000 claims description 25
- 238000002485 combustion reaction Methods 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 4
- 150000002431 hydrogen Chemical class 0.000 abstract description 5
- 238000005096 rolling process Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000004088 simulation Methods 0.000 description 7
- 239000000243 solution Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
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- 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
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- Output Control And Ontrol Of Special Type Engine (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention provides a hydrogen fuel engine and a tumble adjusting method thereof, which are used for acquiring real-time working condition information of the hydrogen fuel engine to determine a pressure value of a hydrogen injection pressure regulator, and controlling a hydrogen injector to inject hydrogen into a cylinder based on the pressure value to obtain a tumble ratio of the cylinder; when the tumble ratio is not in the threshold range corresponding to the real-time working condition information, adjusting the hydrogen fuel engine, re-determining the pressure value of the hydrogen injection pressure regulator, and controlling the hydrogen injector to inject hydrogen into the cylinder based on the pressure value to obtain a new tumble ratio of the cylinder; when the tumble ratio is within the threshold range, it is determined that the hydrogen fuel engine reaches the optimal tumble ratio. The method comprises the steps of determining the injection pressure of the hydrogen injector according to the real-time working condition of the hydrogen fuel engine, adjusting the hydrogen fuel engine, changing the flow state in the cylinder based on the kinetic energy of injected hydrogen, enabling the hydrogen fuel engine to achieve the optimal tumble ratio under different working conditions, improving the mixing uniformity in the cylinder, enabling the fuel in the cylinder to burn more fully, and improving the thermal efficiency of the engine.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a hydrogen fuel engine and a tumble adjusting method thereof.
Background
Compared with methane and gasoline, the hydrogen as a renewable clean energy source has the advantages of high unit mass low heat value, low ignition energy, wide ignition limit, high flame propagation speed, less emission and the like in the application aspect of the internal combustion engine. Meanwhile, the direct injection mode in the cylinder of the hydrogen fuel engine can not only improve the power by improving the charge coefficient, but also avoid abnormal combustion phenomena such as backfire, pre-combustion and the like.
For the in-cylinder direct injection hydrogen fuel engine, the in-cylinder mixing uniformity and the in-cylinder airflow structure can have important influence on in-cylinder combustion after ignition, so that the in-cylinder mixing uniformity can be increased by using tumble of the in-cylinder structure, but the too high tumble is difficult to break near a compression top dead center, and the risk of fire exists.
Therefore, how to adjust the tumble flow of the in-cylinder structure, increase the mixing uniformity in the cylinder and improve the thermal efficiency of the engine is a problem to be solved urgently at present.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a hydrogen fuel engine and a tumble adjusting method thereof, which are used for solving the problems of uneven mixing of air flow in a cylinder of the hydrogen fuel engine and low thermal efficiency.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
the first aspect of the invention discloses a tumble flow adjusting method for a hydrogen fuel engine, comprising the following steps:
acquiring real-time working condition information of a hydrogen fuel engine;
determining a pressure value of a hydrogen injection pressure regulator according to the real-time working condition information, and controlling the hydrogen injector to inject hydrogen into a cylinder based on the pressure value to obtain a tumble ratio of the cylinder;
when the tumble ratio is not in the threshold range corresponding to the real-time working condition information, adjusting the hydrogen fuel engine according to the tumble ratio, returning to execute the step of determining the pressure value of the hydrogen injection pressure regulator according to the real-time working condition information, and controlling the hydrogen injector to inject hydrogen into the cylinder based on the pressure value to obtain the tumble ratio of the cylinder;
and when the tumble ratio is in a threshold range corresponding to the real-time working condition information, determining that the hydrogen fuel engine reaches the optimal tumble ratio.
Preferably, the determining the pressure value of the hydrogen injection pressure regulator according to the real-time working condition information, and controlling the hydrogen injector to inject hydrogen into the cylinder based on the pressure value, to obtain the tumble ratio of the cylinder, includes:
when the real-time working condition information is high-speed working condition information, determining that the pressure value of the hydrogen injection pressure regulator is a minimum pressure value;
and controlling the hydrogen injector to inject hydrogen into the cylinder based on the minimum pressure value to obtain the high-speed working condition tumble ratio of the cylinder.
Preferably, when the tumble ratio is not in the threshold range corresponding to the real-time working condition information, the adjusting the hydrogen fuel engine according to the tumble ratio includes:
and when the high-speed working condition tumble ratio is not in the threshold range corresponding to the high-speed working condition information, adjusting the air passage size of the hydrogen fuel engine under the high-speed working condition according to the high-speed working condition tumble ratio.
Preferably, the determining the pressure value of the hydrogen injection pressure regulator according to the real-time working condition information, and controlling the hydrogen injector to inject hydrogen into the cylinder based on the pressure value, to obtain the tumble ratio of the cylinder, includes:
when the real-time working condition information is low-speed working condition information, determining that the pressure value of the hydrogen injection pressure regulator is the maximum pressure value;
and controlling the hydrogen injector to inject hydrogen into the cylinder based on the maximum pressure value to obtain the low-speed working condition tumble ratio of the cylinder.
Preferably, when the tumble ratio is not in the threshold range corresponding to the real-time working condition information, the adjusting the hydrogen fuel engine according to the tumble ratio includes:
and when the low-speed working condition tumble ratio is not in the threshold range corresponding to the low-speed working condition information, adjusting the flow guiding device of the hydrogen fuel engine under the low-speed working condition according to the low-speed working condition tumble ratio.
Preferably, the determining the pressure value of the hydrogen injection pressure regulator according to the real-time working condition information, and controlling the hydrogen injector to inject hydrogen into the cylinder based on the pressure value, to obtain the tumble ratio of the cylinder, includes:
when the real-time working condition information is target working condition information, determining the pressure value of the hydrogen injection pressure regulator as a target pressure value, wherein the target working condition is other working conditions except a high-speed working condition and a low-speed working condition, and the target pressure value is other pressure values except a minimum pressure value and a maximum pressure value;
and controlling the hydrogen injector to inject hydrogen into the cylinder based on the target pressure value to obtain the target working condition tumble ratio of the cylinder.
Preferably, when the tumble ratio is not in the threshold range corresponding to the real-time working condition information, the adjusting the hydrogen fuel engine according to the tumble ratio includes:
and when the target working condition tumble ratio is not in the threshold range corresponding to the target working condition information, adjusting a hydrogen injection pressure regulator of the hydrogen fuel engine under the target working condition according to a target pressure value corresponding to the target working condition tumble ratio.
The second aspect of the invention discloses a hydrogen fuel engine, which at least comprises a basic device, a fuel supply system, a pressure sensor, a flow guiding device and an electric control unit;
the basic device is connected with the fuel supply system through a flow guiding device; the flow guiding device is a cavity, and holes are formed in the cavity;
the pressure sensor is arranged on the fuel supply system, the pressure sensor and the fuel supply system are respectively connected with the electric control unit, and the electric control unit is used for executing the tumble flow regulating method of the hydrogen fuel engine disclosed in the first aspect of the invention.
Preferably, the basic device comprises at least: the device comprises an air inlet channel, an air inlet valve, a spark plug, a hydrogen sprayer, an exhaust channel, an exhaust valve, a cylinder cover, a cylinder and a piston;
the piston is connected with the cylinder cover to form a cylinder, so that a combustion chamber is formed between the cylinder cover and the piston;
the two sides of the central axis of the outer surface of the cylinder cover are respectively provided with the air inlet valve and the air outlet valve, the air inlet valve is connected with the air inlet channel, and the air outlet valve is connected with the air outlet channel;
the spark plug and the hydrogen sprayer are arranged on the central axis of the outer surface of the cylinder cover, the spark plug is arranged on one side of the exhaust passage, and the hydrogen sprayer is arranged on one side of the air inlet passage.
Preferably, the fuel supply system includes at least: the hydrogen storage tank, the hydrogen supply switch, the hydrogen pressure reducing valve, the hydrogen temperature regulator, the hydrogen spraying pressure regulator and the hydrogen rail;
one end of the hydrogen supply switch is connected with the hydrogen storage tank, and the other end of the hydrogen supply switch is connected with one end of the hydrogen pressure reducing valve;
one end of the hydrogen temperature regulating valve is connected with the other end of the hydrogen pressure reducing valve, and the other end of the hydrogen temperature regulating valve is connected with one end of the hydrogen spraying pressure regulator;
the other end of the hydrogen injection pressure regulator is connected with the hydrogen rail, and the pressure sensor is arranged on the hydrogen rail;
the hydrogen rail is provided with a plurality of flow guiding devices, and is connected with the basic device through the flow guiding devices;
the hydrogen injection pressure regulator is connected with the electric control unit.
Based on the hydrogen fuel engine and the tumble adjusting method thereof provided by the embodiment of the invention, the real-time working condition information of the hydrogen fuel engine is obtained to determine the pressure value of the hydrogen injection pressure regulator, and the hydrogen injector is controlled to inject hydrogen into the cylinder based on the pressure value to obtain the tumble ratio of the cylinder; when the tumble ratio is not in the threshold range corresponding to the real-time working condition information, adjusting the hydrogen fuel engine, re-determining the pressure value of the hydrogen injection pressure regulator, and controlling the hydrogen injector to inject hydrogen into the cylinder based on the pressure value to obtain a new tumble ratio of the cylinder; when the tumble ratio is within the threshold range, it is determined that the hydrogen fuel engine reaches the optimal tumble ratio. The method comprises the steps of determining the injection pressure of the hydrogen injector according to the real-time working condition of the hydrogen fuel engine, adjusting the hydrogen fuel engine, changing the flow state in the cylinder based on the kinetic energy of injected hydrogen, enabling the hydrogen fuel engine to achieve the optimal tumble ratio under different working conditions, improving the mixing uniformity in the cylinder, enabling the fuel in the cylinder to burn more fully, and improving the thermal efficiency of the engine.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a hydrogen fuelled engine according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a flow guiding device according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a basic device according to an embodiment of the present invention;
FIG. 4 is a top view of a cylinder head provided by an embodiment of the present invention;
fig. 5 is a front view of a cylinder cover according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a fuel supply system according to an embodiment of the present invention;
FIG. 7 is a flow chart of a method for tumble adjustment for a hydrogen fuel engine according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of in-cylinder tumble flow according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a flow state of tumble flow in a cylinder in a hydrogen injection process according to an embodiment of the present invention;
fig. 10 is a schematic diagram of the relationship between rail pressure and rotational speed according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
As known from the background art, in-cylinder mixing uniformity and in-cylinder airflow structure of an in-cylinder direct injection hydrogen fuel engine can have important influence on in-cylinder combustion after ignition, and in-cylinder mixing uniformity can be improved by tumble flow of the in-cylinder structure, but how to properly adjust the tumble flow of the in-cylinder structure is a problem to be solved at present.
Therefore, the embodiment of the invention provides a hydrogen fuel engine and a tumble adjusting method thereof, which are used for acquiring real-time working condition information of the hydrogen fuel engine to determine a pressure value of a hydrogen injection pressure regulator, and controlling the hydrogen injector to inject hydrogen into a cylinder based on the pressure value to obtain a tumble ratio of the cylinder; when the tumble ratio is not in the threshold range corresponding to the real-time working condition information, adjusting the hydrogen fuel engine, re-determining the pressure value of the hydrogen injection pressure regulator, and controlling the hydrogen injector to inject hydrogen into the cylinder based on the pressure value to obtain a new tumble ratio of the cylinder; when the tumble ratio is within the threshold range, it is determined that the hydrogen fuel engine reaches the optimal tumble ratio. The method comprises the steps of determining the injection pressure of the hydrogen injector according to the real-time working condition of the hydrogen fuel engine, adjusting the hydrogen fuel engine, changing the flow state in the cylinder based on the kinetic energy of injected hydrogen, enabling the hydrogen fuel engine to achieve the optimal tumble ratio under different working conditions, improving the mixing uniformity in the cylinder, enabling the fuel in the cylinder to burn more fully, and improving the thermal efficiency of the engine.
Referring to fig. 1, there is shown a schematic structural diagram of a hydrogen fuel engine according to an embodiment of the present invention, which includes at least a base unit 100, a fuel supply system 200, a pressure sensor 300, a flow guiding device 400, and an electronic control unit 500.
It is understood that the electronic control unit 500 is an ECU. The hydrogen fuel engine provided by the invention is suitable for a low-pressure direct injection engine in a hydrogen cylinder.
Wherein the base unit 100 is connected with the fuel supply system 200 through the flow guiding device 400. As shown in fig. 2, the flow guiding device 400 is a cavity, and the hole is formed in the cavity (the direction of the hole is adjusted according to the requirement). The pressure sensor 300 is disposed in the fuel supply system 200, and the pressure sensor 300 and the fuel supply system 200 are respectively connected to the electronic control unit 500, and the electronic control unit 500 is used for controlling the fuel supply system 200 to inject hydrogen gas to the base unit 100 according to the pressure value detected by the pressure sensor 300.
It should be noted that, in connection with the content shown in fig. 3, the basic device 100 includes at least: a piston 1, a cylinder cover 2, a cylinder 3, an air inlet channel 4, an air outlet channel 5, an air outlet valve 6, an air inlet valve 7, a spark plug 8 and a hydrogen injector 9.
Wherein, the piston 1 is connected with the cylinder cover 2 to form a cylinder 3, so that a combustion chamber is formed between the cylinder cover 2 and the piston 1. As shown in fig. 4, two sides of the central axis of the outer surface of the cylinder cover 2 are respectively provided with an intake valve 7 and an exhaust valve 6, the intake valve 7 is connected with the air inlet channel 4, and the exhaust valve 6 is connected with the exhaust channel 5; the spark plug 8 and the hydrogen sprayer 9 are arranged on the central axis of the outer surface of the cylinder cover 2, the spark plug 8 is arranged on one side of the exhaust passage 5, and the hydrogen sprayer 9 is arranged on one side of the air inlet passage 4.
The hydrogen sprayer 9 is disposed on the cylinder cover 2, the head of the hydrogen sprayer 9 is connected with a flow guiding device 400, and the flow guiding device 400 extends into the combustion chamber.
It will be appreciated that as shown in fig. 5, the cylinder head is in the form of a canopy, and the canopy angle α is 14 to 17 degrees. The air flow inside the cylinder 3 organizes a tumble form.
It should be noted that, in connection with the description shown in fig. 6, the fuel supply system 200 includes at least: a hydrogen tank 10, a hydrogen supply switch 11, a hydrogen pressure reducing valve 12, a hydrogen temperature regulator 13, a hydrogen injection pressure regulator 14, and a hydrogen rail 15. Also shown in fig. 6 are an electronic control unit ECU16, a pressure sensor 17, a hydrogen injector 9, and a cylinder 3.
Wherein, one end of the hydrogen supply switch 11 is connected with the hydrogen storage tank 10, and the other end of the hydrogen supply switch 11 is connected with one end of the hydrogen pressure reducing valve 12; one end of the hydrogen temperature regulating valve 13 is connected with the other end of the hydrogen pressure reducing valve 12, and the other end of the hydrogen temperature regulating valve 13 is connected with one end of the hydrogen injection pressure regulator 14; the other end of the hydrogen injection pressure regulator 14 is connected with a hydrogen rail 15, and a pressure sensor 300 is arranged on the hydrogen rail 15; a plurality of flow guiding devices 400 are arranged on the hydrogen rail 15, and the hydrogen rail 15 is connected with the basic device 100 through the flow guiding devices 400; the hydrogen injection pressure regulator 14 is connected to the electronic control unit 500.
It is understood that the electronic control unit 500 adjusts the valve opening of the hydrogen injection pressure regulator 14 according to the pressure value of the hydrogen rail 15 detected by the pressure sensor 300, so as to achieve the purpose of adjusting the pressure of the hydrogen rail 15.
In the embodiment of the invention, the hydrogen fuel engine suitable for the in-cylinder structure tumble is provided, and the fuel supply system is used for adjusting the air flow structure in the cylinder so as to achieve the effects of improving the in-cylinder tumble ratio and accelerating the combustion speed.
Referring to fig. 7, a flow chart of a tumble adjusting method for a hydrogen fuel engine according to an embodiment of the present invention is shown and applied to the hydrogen fuel engine according to the embodiment of the present invention as set forth in fig. 1.
It will be appreciated that, referring to fig. 8, the organized rotation of air around the vertical line of the cylinder axis formed during intake is referred to as tumble. The rolling flow in the cylinder is formed in two modes, one is that the air inlet channel is designed in shape so that air forms rolling flow when flowing through the air inlet channel and entering the cylinder; the other is to enhance tumble flow by injecting fuel through an injector.
Under the condition of unchanged configuration, the rolling flow ratio of the engine under different working conditions is different, and the optimal rolling flow ratio under different working conditions is also different, so that the engine correspondingly has an optimal rolling flow ratio under a specific working condition (design working condition) to achieve the optimal engine thermal efficiency. Therefore, the embodiment of the present invention proposes to adjust the flow state in the cylinder through the hydrogen injection process, the expression of which is shown in fig. 9. The tumble flow adjusting method of the hydrogen fuel engine comprises the following steps:
step S701: and acquiring real-time working condition information of the hydrogen fuel engine.
In the specific implementation process of step S701, current real-time working condition information of the hydrogen fuel engine, such as high-speed working condition information, low-speed working condition information, target working condition information, and the like, is obtained.
The target operating condition information is other operating condition information except the high-speed operating condition information and the low-speed operating condition information.
Step S702: and determining the pressure value of the hydrogen injection pressure regulator according to the real-time working condition information, and controlling the hydrogen injector to inject hydrogen into the cylinder based on the pressure value to obtain the tumble ratio of the cylinder.
It is understood that the hydrogen injection pressure and the optimal tumble ratio for different conditions of the hydrogen fuelled engine are different.
In the specific implementation process of step S702, when the real-time working condition information is high-speed working condition information, determining that the pressure value of the hydrogen injection pressure regulator is a minimum pressure value (i.e., the minimum injection capacity of the hydrogen injector); and controlling the hydrogen injector to inject hydrogen into the cylinder based on the minimum pressure value to obtain the high-speed working condition tumble ratio of the cylinder.
When the real-time working condition information is low-speed working condition information, determining that the pressure value of the hydrogen injection pressure regulator is a maximum pressure value (namely the highest injection capacity of the hydrogen injector); and controlling the hydrogen injector to inject hydrogen into the cylinder based on the maximum pressure value to obtain the low-speed working condition tumble ratio of the cylinder.
When the real-time working condition information is the target working condition information, determining the pressure value of the hydrogen injection pressure regulator as a target pressure value, wherein the target working condition is other working conditions except a high-speed working condition and a low-speed working condition, and the target pressure value is other pressure values except a minimum pressure value and a maximum pressure value; and controlling the hydrogen injector to inject hydrogen into the cylinder based on the target pressure value to obtain the target working condition tumble ratio of the cylinder.
It can be understood that the hydrogen injection time is short under the high-speed working condition, the hydrogen injector needs more fuel under the conditions of high rotating speed and high load, and meanwhile, the situation that the tumble ratio is too high cannot occur after the hydrogen injection is ensured, so that the hydrogen is injected into the cylinder by utilizing the minimum injection pressure, and the tumble ratio in the cylinder reaches the optimal tumble ratio.
It should be noted that under the low-speed working condition and the same air passage condition, it is necessary to ensure that the tumble ratio is not too low after the injection of hydrogen, so that the maximum injection pressure is used to inject hydrogen into the cylinder, so that the tumble ratio in the cylinder reaches the optimal tumble ratio.
Step S703: judging whether the rolling flow ratio of the cylinder is in a threshold range corresponding to the real-time working condition information, and if the rolling flow ratio of the cylinder is not in the threshold range corresponding to the real-time working condition information, executing step S704; if the tumble ratio of the cylinder is within the threshold range corresponding to the real-time working condition information, step S705 is executed.
In the specific implementation process of step S703, it is determined whether the high-speed working condition tumble ratio of the cylinder is within a threshold range corresponding to the high-speed working condition information; if the high-speed working condition tumble ratio of the cylinder is not within the threshold range corresponding to the high-speed working condition information, executing step S704; if the high-speed operating mode tumble ratio of the cylinder is within the threshold range corresponding to the high-speed operating mode information, step S705 is executed.
Or judging whether the low-speed working condition tumble ratio of the cylinder is in a threshold range corresponding to the low-speed working condition information; if the low-speed working condition tumble ratio of the cylinder is not within the threshold range corresponding to the low-speed working condition information, executing step S704; if the low-speed operating mode tumble ratio of the cylinder is within the threshold range corresponding to the low-speed operating mode information, step S705 is executed.
Or judging whether the target working condition tumble ratio of the cylinder is in a threshold range corresponding to the target working condition information; if the target working condition tumble ratio of the cylinder is not within the threshold range corresponding to the target working condition information, executing step S704; if the target operating condition tumble ratio of the cylinder is within the threshold range corresponding to the target operating condition information, step S705 is executed.
Step S704: the hydrogen fuel engine is adjusted according to the tumble ratio, and step S702 is executed back.
In the specific implementation process of step S704, when the high-speed working condition tumble ratio is not within the threshold range corresponding to the high-speed working condition information, the air passage size of the hydrogen fuel engine under the high-speed working condition is adjusted according to the high-speed working condition tumble ratio, and the execution returns to step S702.
And when the low-speed working condition tumble ratio is not in the threshold range corresponding to the low-speed working condition information, adjusting a flow guiding device of the hydrogen fuel engine under the low-speed working condition according to the low-speed working condition tumble ratio, and returning to the execution step S702.
It can be understood that the current pressure of the injected hydrogen is higher, generally 20 mpa-40 mpa, the injection pressure is high, the speed of the hydrogen sprayed out from the diversion port is high, and the kinetic energy is high, so that the tumble ratio can be further improved by changing the design of the diversion port to be matched with the tumble in the cylinder.
For example: if the low-speed working condition tumble ratio is smaller than the minimum value in the threshold range corresponding to the low-speed working condition information, the aperture of the diversion hole of the diversion device is reduced or the diversion direction of the diversion device is adjusted so as to achieve the aim of achieving the optimal tumble ratio in the cylinder.
And when the target working condition rolling flow ratio is not in the threshold range corresponding to the target working condition information, adjusting a hydrogen injection pressure regulator of the hydrogen fuel engine under the target working condition according to the target pressure value corresponding to the target working condition rolling flow ratio, and returning to the execution step S702.
It is understood that, under the target condition, the hydrogen injection pressure regulator of the hydrogen fuel engine under the target condition is adjusted according to the relationship between the current target tumble ratio and the threshold range corresponding to the target condition information (the current target tumble ratio is greater than the maximum value of the threshold range or is smaller than the minimum value of the threshold range) so as to adjust the rail pressure of the hydrogen rail. As shown in fig. 10, under the working condition that the higher the rotation speed is, the smaller the relative demand of the rail pressure of the hydrogen rail is; under the working condition of lower rotating speed, the relative demand of the rail pressure of the hydrogen rail is larger.
Step S705: an optimal tumble ratio for the hydrogen fuelled engine is determined.
In the specific implementation process of step S705, when the high-speed working condition tumble ratio of the cylinder is in the threshold range corresponding to the high-speed working condition information, determining that the hydrogen fuel engine reaches the optimal tumble ratio corresponding to the high-speed working condition information; when the low-speed working condition tumble ratio of the cylinder is in a threshold range corresponding to the low-speed working condition information, determining that the hydrogen fuel engine reaches the optimal tumble ratio corresponding to the low-speed working condition information; and when the target working condition tumble ratio of the cylinder is in a threshold range corresponding to the target working condition information, determining that the hydrogen fuel engine reaches the optimal tumble ratio corresponding to the target working condition information.
In some specific embodiments, a simulation model of the hydrogen fuel engine can be built on the basis of original test data, the data such as cylinder pressure, heat release rate, tumble ratio and the like obtained by simulation calculation and test results are compared by correcting the simulation model, if the calibration error exceeds the fit range, parameter setting and grids of the simulation model are adjusted until the error meets the limit value (for example, the tumble error is not more than 5%, the cylinder pressure is not more than 2% and the heat release rate is not more than 10%). After the error meets the limit value, grid setting, parameter setting and the like in the simulation model are formed into a specification, and the simulation specification is suitable for simulation model selection of air inlet systems of other subsequent models.
In the embodiment of the invention, the injection pressure of the hydrogen injector is determined according to the real-time working condition of the hydrogen fuel engine, the air passage and the flow guiding device of the hydrogen fuel engine are adjusted, the flow state in the cylinder is changed based on the kinetic energy of the injected hydrogen, the hydrogen fuel engine reaches the optimal tumble ratio under different working conditions, the in-cylinder mixing uniformity is improved, the in-cylinder fuel is combusted more fully, and the thermal efficiency of the engine is improved.
In summary, the embodiment of the invention provides a hydrogen fuel engine and a tumble adjusting method thereof, wherein a basic device in the hydrogen fuel engine is connected with a fuel supply system through a flow guiding device; the flow guiding device is a cavity, and a hole is formed in the cavity; the pressure sensor is arranged on the fuel supply system, the electric control unit is connected with the fuel supply system, and the electric control unit is used for controlling the fuel supply system to spray hydrogen to the basic device according to the pressure value detected by the pressure sensor. And simultaneously, the electric control unit is used for adjusting the hydrogen fuel engine according to different working conditions and pressure values of the hydrogen fuel engine, so that the tumble ratio of the hydrogen fuel engine reaches an optimal value, the mixing uniformity in a cylinder is increased, the combustion of the engine is more complete, and the thermal efficiency of the engine is improved.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
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 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 tumble flow adjustment for a hydrogen-fuelled engine, the method comprising:
acquiring real-time working condition information of a hydrogen fuel engine;
determining a pressure value of a hydrogen injection pressure regulator according to the real-time working condition information, and controlling the hydrogen injector to inject hydrogen into a cylinder based on the pressure value to obtain a tumble ratio of the cylinder;
when the tumble ratio is not in the threshold range corresponding to the real-time working condition information, adjusting the hydrogen fuel engine according to the tumble ratio, returning to execute the step of determining the pressure value of the hydrogen injection pressure regulator according to the real-time working condition information, and controlling the hydrogen injector to inject hydrogen into the cylinder based on the pressure value to obtain the tumble ratio of the cylinder;
and when the tumble ratio is in a threshold range corresponding to the real-time working condition information, determining that the hydrogen fuel engine reaches the optimal tumble ratio.
2. The method of claim 1, wherein determining a pressure value of a hydrogen injection pressure regulator according to the real-time operating condition information, and controlling the hydrogen injector to inject hydrogen gas into a cylinder based on the pressure value, to obtain a tumble ratio of the cylinder, comprises:
when the real-time working condition information is high-speed working condition information, determining that the pressure value of the hydrogen injection pressure regulator is a minimum pressure value;
and controlling the hydrogen injector to inject hydrogen into the cylinder based on the minimum pressure value to obtain the high-speed working condition tumble ratio of the cylinder.
3. The method of claim 2, wherein adjusting the hydrogen fuel engine according to the tumble ratio when the tumble ratio is not within a threshold range corresponding to the real-time operating condition information comprises:
and when the high-speed working condition tumble ratio is not in the threshold range corresponding to the high-speed working condition information, adjusting the air passage size of the hydrogen fuel engine under the high-speed working condition according to the high-speed working condition tumble ratio.
4. The method of claim 1, wherein determining a pressure value of a hydrogen injection pressure regulator according to the real-time operating condition information, and controlling the hydrogen injector to inject hydrogen gas into a cylinder based on the pressure value, to obtain a tumble ratio of the cylinder, comprises:
when the real-time working condition information is low-speed working condition information, determining that the pressure value of the hydrogen injection pressure regulator is the maximum pressure value;
and controlling the hydrogen injector to inject hydrogen into the cylinder based on the maximum pressure value to obtain the low-speed working condition tumble ratio of the cylinder.
5. The method of claim 4, wherein adjusting the hydrogen fuel engine according to the tumble ratio when the tumble ratio is not within a threshold range corresponding to the real-time operating condition information comprises:
and when the low-speed working condition tumble ratio is not in the threshold range corresponding to the low-speed working condition information, adjusting the flow guiding device of the hydrogen fuel engine under the low-speed working condition according to the low-speed working condition tumble ratio.
6. The method of claim 1, wherein determining a pressure value of a hydrogen injection pressure regulator according to the real-time operating condition information, and controlling the hydrogen injector to inject hydrogen gas into a cylinder based on the pressure value, to obtain a tumble ratio of the cylinder, comprises:
when the real-time working condition information is target working condition information, determining the pressure value of the hydrogen injection pressure regulator as a target pressure value, wherein the target working condition is other working conditions except a high-speed working condition and a low-speed working condition, and the target pressure value is other pressure values except a minimum pressure value and a maximum pressure value;
and controlling the hydrogen injector to inject hydrogen into the cylinder based on the target pressure value to obtain the target working condition tumble ratio of the cylinder.
7. The method of claim 6, wherein adjusting the hydrogen fuel engine according to the tumble ratio when the tumble ratio is not within a threshold range corresponding to the real-time operating condition information comprises:
and when the target working condition tumble ratio is not in the threshold range corresponding to the target working condition information, adjusting a hydrogen injection pressure regulator of the hydrogen fuel engine under the target working condition according to a target pressure value corresponding to the target working condition tumble ratio.
8. A hydrogen fuelled engine comprising at least a base unit, a fuel supply system, a pressure sensor, a deflector and an electronic control unit;
the basic device is connected with the fuel supply system through a flow guiding device; the flow guiding device is a cavity, and holes are formed in the cavity;
the pressure sensor is arranged on the fuel supply system, the pressure sensor and the fuel supply system are respectively connected with the electric control unit, and the electric control unit is used for executing the tumble flow regulating method of the hydrogen fuel engine according to any one of claims 1-7.
9. The engine of claim 8, wherein said base means comprises at least: the device comprises an air inlet channel, an air inlet valve, a spark plug, a hydrogen sprayer, an exhaust channel, an exhaust valve, a cylinder cover, a cylinder and a piston;
the piston is connected with the cylinder cover to form a cylinder, so that a combustion chamber is formed between the cylinder cover and the piston;
the two sides of the central axis of the outer surface of the cylinder cover are respectively provided with the air inlet valve and the air outlet valve, the air inlet valve is connected with the air inlet channel, and the air outlet valve is connected with the air outlet channel;
the spark plug and the hydrogen sprayer are arranged on the central axis of the outer surface of the cylinder cover, the spark plug is arranged on one side of the exhaust passage, and the hydrogen sprayer is arranged on one side of the air inlet passage.
10. The engine of claim 8, wherein the fuel supply system includes at least: the hydrogen storage tank, the hydrogen supply switch, the hydrogen pressure reducing valve, the hydrogen temperature regulator, the hydrogen spraying pressure regulator and the hydrogen rail;
one end of the hydrogen supply switch is connected with the hydrogen storage tank, and the other end of the hydrogen supply switch is connected with one end of the hydrogen pressure reducing valve;
one end of the hydrogen temperature regulating valve is connected with the other end of the hydrogen pressure reducing valve, and the other end of the hydrogen temperature regulating valve is connected with one end of the hydrogen spraying pressure regulator;
the other end of the hydrogen injection pressure regulator is connected with the hydrogen rail, and the pressure sensor is arranged on the hydrogen rail;
the hydrogen rail is provided with a plurality of flow guiding devices, and is connected with the basic device through the flow guiding devices;
the hydrogen injection pressure regulator is connected with the electric control unit.
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| CN117722286B (en) | 2024-05-17 |
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