CN109458253B - Air supply system and air supply control method - Google Patents
Air supply system and air supply control method Download PDFInfo
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- CN109458253B CN109458253B CN201811518368.1A CN201811518368A CN109458253B CN 109458253 B CN109458253 B CN 109458253B CN 201811518368 A CN201811518368 A CN 201811518368A CN 109458253 B CN109458253 B CN 109458253B
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- air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B33/00—Engines characterised by provision of pumps for charging or scavenging
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B33/00—Engines characterised by provision of pumps for charging or scavenging
- F02B33/44—Passages conducting the charge from the pump to the engine inlet, e.g. reservoirs
Abstract
The invention provides an air supplementing system and an air supplementing control method, which are used for a generator set comprising a diesel engine and a generator, wherein the diesel engine provides driving force for the generator, the diesel engine is provided with at least two cylinders, the diesel engine feeds air into the at least two cylinders through a turbocharger, an air inlet main pipeline and at least two air inlet branch pipelines which are respectively communicated with the at least two cylinders are arranged between an air feeding port of the turbocharger and the at least two cylinders, and the air supplementing system comprises an air supplementing compressor and an air supplementing pipeline which are used for compressing the air; the input end of the air supply pipeline is communicated with the air supply compressor, and the output end of the air supply pipeline is respectively communicated with the at least two air inlet manifold pipelines, so that air directly enters the corresponding air cylinders through the at least two air inlet manifold pipelines. The air supplementing system provided by the invention enables air in the air supplementing system to directly enter the air inlet manifold so as to quickly enter the air cylinder, and can reduce the surge of the air compressor in the turbocharger.
Description
Technical Field
The invention relates to the technical field of diesel engines, in particular to a gas supplementing system and a gas supplementing control method.
Background
Turbo lag occurs during acceleration/loading conditions of a turbocharged diesel engine under low load conditions. Specifically, the dynamic property is deteriorated, the acceleration is slow, and black smoke is emitted. This is caused by the inability of the diesel engine to output a matching torque after the external load on the diesel engine has increased. Although the existing diesel engine can quickly react with a fuel system to output corresponding oil quantity after an electronic control system is adopted for operating the existing diesel engine, in the process of a supercharging system, due to the rotational inertia of a supercharger, the compressibility of gas in an air inlet and exhaust system and the like, a turbocharging system cannot quickly respond and provide enough air inlet quantity, at the moment, the excess air coefficient is sharply reduced to a lower value, the in-cylinder combustion is deteriorated, the dynamic index is reduced, the emission index is deteriorated, and particularly, the soot emission is sharply increased.
Based on this, the existing diesel engine usually supplements enough air input to the air intake system through the air supplement technology, namely when the turbo lag phenomenon occurs, so that enough air is stored in the cylinder to enable the combustion to be normally carried out, and the dynamic performance and the transient emission of the diesel engine are optimized. However, in the existing gas supplementing process, a gas supplementing pipeline is usually directly connected to a compressor shell in a turbocharger, and gas directly impacts blades, so that too high gas supplementing pressure cannot be adopted, the gas can only enter a cylinder after flowing through parts such as a compressor, a gas inlet main pipe and the like, the gas supplementing intervention combustion process is long in time, and the effect is not obvious. The existing gas supplementing process also directly connects a gas supplementing pipeline to a gas inlet main pipe, and when supplemented gas enters the gas inlet main pipe, if the gas pressure is too high, the surge of a gas compressor is easily caused.
Therefore, there is a need for a gas replenishment system and a gas replenishment control method that at least partially solve the problems of the prior art.
Disclosure of Invention
In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
In order to at least partially solve the above problems, according to one aspect of the present invention, there is provided an air supplement system for a generator set including a diesel engine and a generator, the diesel engine providing a driving force to the generator, the diesel engine being provided with at least two cylinders, the diesel engine feeding air to the at least two cylinders through a turbocharger, an intake main pipe and at least two intake manifold pipes communicating with the at least two cylinders, respectively, being provided between an air supply port of the turbocharger and the at least two cylinders, the air supplement system comprising:
the air supply compressor is used for compressing air; and
and the input end of the air supplementing pipeline is communicated with the air supplementing compressor, and the output end of the air supplementing pipeline is respectively communicated with the at least two air inlet manifold pipelines, so that the air directly and respectively enters the corresponding air cylinders through the at least two air inlet manifold pipelines.
According to the scheme, the output end of the air supplementing system is directly connected to the air inlet manifold pipeline communicated with the air cylinder, so that air in the air supplementing system can directly enter the air inlet manifold pipeline and rapidly enter the air cylinder, and surging of the air compressor in the turbocharger can be reduced. And because the air replenishing compressor is arranged, air with higher compressed pressure can be replenished into the air cylinder.
Optionally, the output end of the air supply line is provided with an injection device corresponding to each of the intake manifold lines, the air entering the intake manifold lines via the injection devices.
Optionally, the gas supplementing system further comprises a pressure reducing device and a gas storage device arranged at the downstream of the gas supplementing compressor, and the pressure reducing device is arranged between the gas supplementing compressor and the gas storage device.
Optionally, the gas supply line has a pipe diameter that decreases from a larger diameter near the outlet of the gas storage device.
Optionally, the gas make-up line is provided with a safety valve downstream of the gas storage device.
Optionally, the gas supplementing system comprises a control unit, and the control unit is configured to make the gas supplementing system supplement gas to the diesel engine according to the operation load and/or the loading load amplitude of the diesel engine.
Optionally, the control unit is configured to control the gas supplementing system not to supplement gas to the diesel engine when the operating load is greater than or equal to a preset load value.
Optionally, the control unit is configured to not replenish the gas to the diesel engine by the gas replenishing system when the operating load is smaller than a preset load value and the load amplitude is smaller than a preset load amplitude value.
Optionally, the control unit is configured to, when the operating load is less than a preset load value and the load amplitude is greater than or equal to the preset load amplitude value, make up air to the diesel engine by the air make-up system.
Optionally, the control unit is configured to control the number of air make-up cycles of air make-up from the air make-up system to the diesel engine according to the magnitude of the loading load.
Optionally, the control unit is further configured to make the air make-up system make up air to the diesel engine when the air of the diesel engine is fed, and the air make-up of the air make-up system is started before an inlet valve of the diesel engine is opened, and the air make-up of the air make-up system is stopped before the inlet valve of the diesel engine is closed.
According to another aspect of the present invention, there is provided a gas supply control method for a generator set including a diesel engine and a generator, using the gas supply system according to any one of the above aspects, the diesel engine providing a driving force to the generator, the gas supply control method including the steps of:
and judging a loading area, namely comparing the running load of the diesel engine with a preset load value to judge whether the air supplementing system supplements air to the diesel engine.
According to the scheme, the load signal of the diesel engine obtained by calculating the load signal of the generator is adopted to preliminarily judge whether the air supplement system supplements air to the diesel engine, and compared with the existing mode of judging whether air supplement is carried out by adopting the rotating speed signal of the diesel engine, the air supplement reaction is more sensitive.
Optionally, in the step of determining the loading area, when the operating load is greater than or equal to the preset load value, the gas supplementing system does not supplement gas to the diesel engine.
Optionally, the method further comprises a step of judging the loading load amplitude after the step of judging the loading area, and the step of comparing the loading load amplitude of the diesel engine with a preset value of the loading load amplitude is performed to judge whether the gas supplementing system supplements gas to the diesel engine.
Optionally, in the step of determining a loading area, when the operating load is smaller than the preset load value, the step of determining the loading load amplitude is performed.
Optionally, in the step of determining the loading load amplitude, when the loading load amplitude is smaller than the preset loading load amplitude value, the gas supplementing system does not supplement gas to the diesel engine.
Optionally, in the step of determining the loading load amplitude, when the loading load amplitude is greater than or equal to the preset loading load amplitude value, the gas supplementing system supplements gas to the diesel engine.
Optionally, the number of air make-up cycles of the air make-up system for making up air to the diesel engine is controlled according to the magnitude of the loading load.
Optionally, the air supply system supplies air to the diesel engine by controlling the opening of an air supply nozzle.
Drawings
The following drawings of the invention are included to provide a further understanding of the invention. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles and apparatus of the invention. In the drawings, there is shown in the drawings,
FIG. 1 is a schematic diagram of a gas make-up system according to a preferred embodiment of the present invention, further illustrating the structure of a diesel engine;
FIG. 2 is a schematic diagram of the connection of the control unit of the gas replenishing system according to the preferred embodiment of the present invention;
FIG. 3 is a schematic flow chart of a method for controlling air supply according to a preferred embodiment of the present invention;
FIG. 4 is a table of interpolation of the number of aeration cycles for the aeration control method of FIG. 3;
FIG. 5 is a table of an embodiment of an interpolation of the number of air supply cycles; and
FIG. 6 is a schematic time-axis diagram of the air make-up phase of the air make-up system relative to the air intake phase of the diesel engine, with crank angle as a time reference.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.
In the following description, for purposes of explanation, specific details are set forth in order to provide a thorough understanding of the present invention. It is apparent that the practice of the invention is not limited to the specific details set forth herein as are known to those of skill in the art. The following detailed description of the preferred embodiments of the present invention, however, the present invention may have other embodiments in addition to the detailed description, and should not be construed as being limited to the embodiments set forth herein.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention, as the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. When the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The terms "upper", "lower", "front", "rear", "left", "right" and the like as used herein are for purposes of illustration only and are not limiting.
Ordinal words such as "first" and "second" are referred to herein merely as labels, and do not have any other meaning, such as a particular order, etc. Also, for example, the term "first component" does not itself imply the presence of "second component", and the term "second component" does not itself imply the presence of "first component".
In the following, specific embodiments of the present invention will be described in more detail with reference to the accompanying drawings, which illustrate representative embodiments of the invention and do not limit the invention.
As shown in fig. 1, the present invention provides an air make-up system for a generator set including a diesel engine 100 and a generator 200 (fig. 2), and particularly, the air make-up system is used for making up air for the diesel engine 100, so that the illustrated embodiment shown in fig. 1 only shows the structure of the diesel engine 100. It is understood that the diesel engine 100 can be connected with the generator 200 and provide a driving force to the generator 200.
Since the respective structures of the diesel engine 100 and the generator 200 and the connection manner with each other are already known, they will not be described in detail for the sake of brevity. In the present embodiment, the diesel engine 100 is provided with at least two cylinders 110, and the diesel engine 100 feeds air to the at least two cylinders 110 through the turbocharger 120. An intake main conduit L1 and at least two intake manifold conduits L2 communicating with the at least two cylinders 110, respectively, are provided between the air supply port of the turbocharger 120 and the at least two cylinders 110. The intake manifold line L2 corresponds one-to-one to the cylinders 110. Specifically, at least two cylinders 110 are arranged side by side, and here, it is understood that, as shown in fig. 1, two rows may be provided when the number of cylinders 110 is large, and the cylinders 110 of each row are arranged side by side. The turbocharger 120 includes a turbine compressor 121 and a supercharger 122. The compressed air output from the air supply port of the turbine compressor 121 enters the corresponding cylinder 110 through the main air supply line L1 and each of the air supply manifold lines L2 in sequence. In the illustrated embodiment, the intake main line L1 is also provided with an air cooler 130.
The air make-up system comprises an air make-up compressor 310 for compressing air and an air make-up line L3 for delivering air. In this embodiment, air is compressed by the air make-up compressor 310 and then enters the at least two air inlet branch pipelines L2 through the air make-up pipeline L3, so that the air can directly enter the corresponding cylinders 110. Specifically, the air supply line L3 includes an air supply main line L31 and an air supply branch line L32. The make-up main line L31 branches into at least two make-up manifold lines L32 near each cylinder 110. The air-supply manifold line L32 corresponds one-to-one to the intake manifold line L2. It will be appreciated that the output is formed by each of the make-up air manifold lines L32.
Each of the make-up manifold lines L32 is provided with an injection device 320 corresponding to each of the intake manifold lines L2, and air is injected into the intake manifold line L2 via the injection device 320, with this embodiment, the impact of the air flow can be reduced. Optionally, the injection device 320 is shown in the illustrated embodiment as a make-up air nozzle.
The air make-up system further comprises a pressure reducing device 330 and a gas storage device 340 which are arranged at the downstream of the air make-up compressor 310, and the pressure reducing device 330 is arranged between the air make-up compressor 310 and the gas storage device 340. The air compressed by the make-up air compressor 310 can be decompressed to a proper make-up pressure by the decompression device 330 and then delivered to the cylinder 110. The gas supply pressure can generally be from 10bar to 15 bar. The gas storage device is used for storing the decompressed air, so that the gas pressure in the gas supplementing system can be stabilized. Alternatively, the pressure relief device 330 may be a pressure relief valve and the gas storage device may be a gas cylinder.
The gas supply line L3 may have a smaller and larger pipe diameter near the outlet of the gas storage device 340. Specifically, the main gas supply line L31 may be provided with a reducing part 350, such as a reducing pipe, with a reduced pipe diameter. The variable diameter part 350 is disposed downstream of the gas storage device 340, and the flow rate of the air output from the outlet of the gas storage device 340 increases after passing through the variable diameter part 350. The gas supply line L3 may further be provided with a safety valve 360 downstream of the gas storage device 340, when the gas supply pressure does not exceed the safety threshold of the safety valve 360, the safety valve 360 is in a closed state, and when the gas supply pressure exceeds the safety threshold of the safety valve 360, the safety valve 360 opens the gas to be discharged from the safety valve 360 to the external environment. In the illustrated embodiment, the relief valve 360 is disposed downstream of the reducing member 350.
It should be noted that, in the gas make-up system, in addition to the injection device 320 being disposed on the gas make-up manifold line L32, other devices, such as the pressure reducing device 330, the gas storage device 340, etc., are disposed on the gas make-up main line L31.
Further, as shown in fig. 2, the air make-up system may further include a control unit 370, and the control unit 370 can be associated with the diesel engine 100, the generator 200, and the injection device 320 in the air make-up system, and the association can be an electrical connection. The control unit 370 can receive the load signal from the generator 200, and calculate and output the load signal of the generator 200 as the operation load of the diesel engine 100 (i.e., the current operation load of the diesel engine 100 before loading). The control unit 370 may also receive a crankshaft signal (referring to a signal of a crankshaft connected to the cylinder 110) from the diesel engine 100, and may obtain a rotation speed signal of the diesel engine 100 from the crankshaft signal and output as the rotation speed of the diesel engine 100.
The control unit 370 is further capable of sending a control signal (i.e. a gas make-up nozzle signal) to the injection device 320 to control whether the injection device 320 is turned on, i.e. the gas make-up system makes up gas to the diesel engine 100 by controlling the turning-on of the gas make-up nozzle, and stops making up gas when the gas make-up nozzle is turned off. The size of the air supply amount depends on the opening time of the air supply nozzle. The air supplement system may also be provided with a pressure detector (not shown) for detecting the pressure of the supplement air. The pressure detector may be disposed on the gas storage device 340. In this embodiment, the control unit 370 may also receive signals from the pressure detector to monitor the inflation pressure in real time.
In this embodiment, the control unit 370 is configured to make the gas supplementing system supplement gas to the diesel engine 100 according to the operation load and/or the loading load magnitude of the diesel engine 100.
Specifically, referring to fig. 3 and 4, the control unit 370 is configured to control the air make-up system not to make up air to the diesel engine 100 when the operation load of the diesel engine 100 is greater than or equal to the load preset value a. That is, in the case that the operation load of the diesel engine 100 is greater than or equal to the preset load value a, the diesel engine 100 can meet the current operation requirement of the diesel engine 100 without air supplement. It can be seen that the make-up air system may not be used when the diesel engine 100 has a high operating load. The preset load value a is a predetermined value preset as required, and the preset load value a can be set to a value between 40% and 50%, for example, 40%, 45%, or 50% as required.
The control unit 370 is configured to not supplement air to the diesel engine 100 when the operation load of the diesel engine 100 is less than the preset load magnitude a and the loading load magnitude of the diesel engine 100 is less than the preset loading load magnitude B0. That is, in the case that the operation load of the diesel engine 100 is smaller than the preset load value a and the loading load amplitude of the diesel engine 100 is smaller than the preset loading load amplitude value B0, the diesel engine 100 can meet the current operation requirement of the diesel engine 100 without air supplement. Therefore, the gas supplementing system does not necessarily supplement gas when the diesel engine 100 has a low operation load, whether the gas is supplemented needs to be judged according to the magnitude of the loading load amplitude of the diesel engine 100, and the gas is not supplemented to the diesel engine 100 when the loading load amplitude of the diesel engine 100 is small. The loading load range is a value obtained by subtracting the operating load from the loading load (the operating load reached by the diesel engine 100 after loading, which is shown as the target load in fig. 3), and for example, the operating load is 10%, the loading load is 40%, and the loading load range this time is 30%; the preset value of the loading load amplitude B0 is a fixed value preset according to needs, and the preset value of the loading load amplitude B0 can be set to a value between 10% and 20% according to needs, for example, 10%, 15%, or 20%.
The control unit 370 is configured to supplement air to the diesel engine 100 by the air supplement system when the operation load of the diesel engine 100 is less than the preset load value a and the loading load amplitude of the diesel engine 100 is greater than or equal to the preset loading load amplitude B0. In this embodiment, two conditions are simultaneously satisfied for the gas supplementing system to supplement gas to the diesel engine 100, one is that the operation load of the diesel engine 100 is smaller than the preset load amplitude a, and the other is that the loading load amplitude of the diesel engine 100 is greater than or equal to the preset loading load amplitude B0. That is, the air is required to be supplied to the diesel engine 100 when the operation load of the diesel engine 100 is low and the magnitude of the load is large.
The air supply system of the present embodiment enables the air supply system to realize rapid air supply during the loading process of the diesel engine 100 through the operation of the control unit 370, so that the supplied air can rapidly enter the cylinder 110 to participate in the combustion process. Compared with the existing gas supplementing system for supplementing gas only by loading the diesel engine 100, the gas supplementing system of the embodiment can obviously reduce the gas supplementing amount of air, thereby effectively reducing the volume of the gas storage device 340 and effectively reducing the emission of soot. And the loading process can be made gentle and controllable.
Further, the control unit 370 may be further configured to control the number of air make-up cycles of the air make-up system making up air to the diesel engine 100 according to the magnitude of the loading load of the diesel engine 100. The "number of make-up cycles" herein refers to the number of cycles N that the diesel engine 100 can complete during make-up. For example, in the case of a 4-stroke diesel engine 100, the operation process can be divided into 4 stages of intake, compression, expansion and exhaust, and one time the diesel engine 100 completes the above process is called that the diesel engine 100 completes one cycle. The diesel engine 100 completes one cycle and the crankshaft connected to the cylinder 110 rotates 2 revolutions through 720 ° ca. The control unit 370 can determine from the crank signal the number of cycles the diesel engine 100 completes and in which of the 4 stages of the cycle the diesel engine 100 is in.
In this embodiment, the control unit 370 is further configured to make the air make-up system make up air to the diesel engine 100 during the air intake phase of the diesel engine 100. Specifically, after the injection device 320 receives the air make-up nozzle signal from the control unit 370, and during the air intake phase of the diesel engine 100, the injection device 320 is turned on to make up air to the diesel engine 100. During the compression, expansion and exhaust phases of the diesel engine 100, the injection device 320 is closed to stop the supply of gas to the diesel engine 100.
Alternatively, as shown in fig. 6, the control unit 370 is further configured such that the make-up by the make-up system is started before the intake valve of the diesel engine 100 is opened, and the make-up by the make-up system is stopped before the intake valve of the diesel engine 100 is closed. During one cycle of the diesel engine 100, the crank angle is rotated from 0 ° ca to 720 ° ca. The crank angle alpha 1 corresponding to the air charging starting moment is smaller than the crank angle alpha 2 corresponding to the opening moment of the intake valve. Alternatively, the difference between α 1 and α 2 may be less than or equal to 10 ℃ A. For example, the difference between α 1 and α 2 may be 10 ° ca. The crank angle alpha 3 corresponding to the air supply stopping time is smaller than the crank angle alpha 4 corresponding to the air inlet valve closing time. Alternatively, the difference between α 3 and α 4 may be less than or equal to 10 ℃ A. For example, the difference between α 3 and α 4 may be 10 ° ca.
The number of replenishing cycles of the present embodiment needs to be obtained by the replenishing cycle number interpolation table shown in fig. 4. Further, the control unit 370 can calculate the number of the pumping cycles in response to the pumping cycle number interpolation table, thereby controlling the magnitude of the pumping cycles. N preset load amplitude parameters including a preset load amplitude value B0 are set in the air supply cycle number interpolation table, wherein n is greater than or equal to zero. For example, in the embodiment shown in FIG. 4, a first load amplitude parameter B1, a second load amplitude parameter B2, a third load amplitude parameter B3, and a fourth load amplitude parameter B4 are included. And B4 > B3 > B2 > B1 > B0. Further Bn is the sequence value that increases with increasing n. Wherein, the loading rate corresponding to Bn is Bn/10 ms.
A in the air supply cycle number interpolation table refers to the load preset value. N air supplement circulation times Cn +1 which are in one-to-one correspondence with Bn are also arranged in the air supplement circulation time interpolation table. For example, C1, C2, C3, C4, and C5 are shown in the figures. The values of C1, C2, … Cn +1 may be set to different or partially different values as desired.
Fig. 5 exemplarily shows an embodiment of the interpolation table of the number of air supply cycles, wherein the load preset value a is 50%. The preset value of the loading load amplitude B0 is 10%. The loading load amplitude parameters B1, B2, B3 and B4 are 20%, 30%, 40% and 100%, respectively. The number of qi-supplementing circulation times is 10 at C1, 20 at C2 and 30 at C3, C4 and C5. The contents for obtaining the number of replenishing cycles through the replenishing cycle number interpolation table will be described in detail below.
According to another aspect of the present invention, there is provided an air supply control method for a power generating set including a diesel engine 100 and a generator 200 using an air supply system, as shown in fig. 3, the air supply control method including the steps of:
and a step S1 of judging the loading area, in which the operation load of the diesel engine 100 is compared with a preset load value to judge whether the gas supplementing system supplements gas to the diesel engine 100. Here, it is to be understood that the "load region" refers to a determination as to whether the diesel engine 100 is in an operating state before being loaded, i.e., high load operation or low load operation.
Specifically, in the step S1 of determining the loading area, when the operating load of the diesel engine 100 is greater than or equal to the preset load value, that is, the diesel engine 100 is operating at a higher load, the air make-up system does not make up air to the diesel engine 100 and the diesel engine 100 is directly loaded to the loading load (i.e., the illustrated target load). Before the loading area determining step S1, the diesel engine 100 starts loading. When the diesel engine 100 is completely loaded, the process ends.
Alternatively, the step of detecting the operating state of the diesel engine S0 may be performed before the step of determining the loading region S1, in which the control unit can prompt the operating state of the diesel engine to be an acceleration state or a steady state.
The gas supplementing control method further comprises a step S2 of judging the loading load amplitude after the step S1 of judging the loading area, wherein the loading load amplitude of the diesel engine 100 is compared with a preset value of the loading load amplitude so as to judge whether the gas supplementing system supplements gas to the diesel engine 100. In the load region judging step S1, when the operating load of the diesel engine 100 is less than the load preset value, a load magnitude judging step S2 is performed.
In the step S2, when the loading load amplitude is smaller than the loading load amplitude preset value, the gas supplementing system does not supplement gas to the diesel engine 100 and the diesel engine 100 is directly loaded to the loading load (i.e., the illustrated target load). Before the loading area determining step S1, the diesel engine 100 starts loading. When the diesel engine 100 is completely loaded, the process ends.
In the step S2, when the loading load amplitude is greater than or equal to the preset loading load amplitude value, the gas supplementing system supplements gas to the diesel engine 100 and the diesel engine 100 is loaded to the loading load before the gas supplementing. Specifically, when the magnitude of the load is greater than or equal to the preset value of the magnitude of the load, the process proceeds to the next step, i.e., the gas filling nozzle opening step S3, and the control unit 370 controls the gas filling nozzle to open.
The gas make-up control method further includes a gas make-up duration control step S4 after the gas make-up nozzle opening step S3, and when the gas make-up nozzle is opened, the control unit 370 controls the number of gas make-up cycles (the duration of the gas make-up nozzle) of the gas make-up system for making up gas to the diesel engine 100 according to the magnitude of the load. In the air make-up period control step S4, the air make-up nozzle is closed after the air make-up completes the number of air make-up cycles of the diesel engine 100. The process ends when the air make-up nozzle is closed.
Note that the loading of the diesel engine 100 is started before the loading region determining step S1 is performed, and the loading of the diesel engine 100 is started before the air charging period controlling step S4.
The related contents related to the gas compensation control method described in this embodiment are the same as those of the control unit 370 described above, and are not repeated for brevity.
One embodiment of the air supplement control method is described with reference to fig. 5.
When the operating load of the diesel engine 100 is 60%, the diesel engine 100 starts to be loaded, and the routine proceeds to a decision load region step S1. Because the operation load is 60% and more than the load preset value is 50%, no matter what the load is, the air supply nozzle does not act (i.e. is not opened), and the air supply system does not supply air to the diesel engine 100.
When the operating load of the diesel engine 100 is 0%, the diesel engine 100 starts to be loaded, and the routine proceeds to a judgment load area step S1. Because the operation load is more than 0% and less than 50% of the preset load value, the program enters the step S2 of judging the amplitude of the loading load, the loading load is 5%, the amplitude of the loading load is more than 5% and less than 10% of the preset load amplitude value, the air supply nozzle does not act, and the air supply system does not supply air to the diesel engine 100.
When the operating load of the diesel engine 100 is 0%, the diesel engine 100 starts to be loaded, the program enters a step S1 of judging a loading area, since the operating load is 0% < 50% of the preset load value, the program enters a step S2 of judging the loading load amplitude, the loading load is 40%, the loading load amplitude is 40% > 10% of the preset loading load amplitude value, and the air supply nozzle operates (i.e., the step S3 of opening the air supply nozzle). The process advances to a gas filling duration control step S4, where the control unit can obtain the number of gas filling cycles corresponding to the load magnitude of 40% as 30 based on the gas filling duration interpolation table. The air make-up system can make the diesel engine 100 complete 30 cycles when making up air to the diesel engine 100. When 30 cycles are completed, the air make-up nozzle is closed and the process is finished.
Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Terms such as "part," "member," and the like, when used herein, can refer to either a single part or a combination of parts. Terms such as "mounted," "disposed," and the like, as used herein, may refer to one component as being directly attached to another component or one component as being attached to another component through intervening components. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.
The present invention has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications fall within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (18)
1. The utility model provides an air supplement system for generating set including diesel engine and generator, the diesel engine provides drive power to the generator, the diesel engine is provided with two at least cylinders, the diesel engine passes through turbo charger to two at least cylinders send into the air, turbo charger's air supply mouth with be provided with between two at least cylinders admit air main line and with two at least air inlet branch way that two at least cylinders communicate respectively, its characterized in that, air supplement system includes:
the air supply compressor is used for compressing air; and
the input end of the air supplementing pipeline is communicated with the air supplementing compressor, the output end of the air supplementing pipeline is respectively communicated with the at least two air inlet manifold pipelines, so that the air directly enters the corresponding air cylinder through the at least two air inlet manifold pipelines,
the air supply system comprises a control unit, and the control unit is configured to supply air to the diesel engine through the air supply system according to the operation load and the loading load amplitude of the diesel engine.
2. The air make-up system according to claim 1, wherein an output end of the air make-up line is provided with an injection device corresponding to each of the intake manifold lines, the air entering the intake manifold lines via the injection devices.
3. The gas supplementing system of claim 1, further comprising a pressure reducing device and a gas storage device disposed downstream of the gas supplementing compressor, the pressure reducing device disposed between the gas supplementing compressor and the gas storage device.
4. The gas supplementing system according to claim 3, wherein the gas supplementing pipeline has a pipe diameter that decreases from a larger diameter near the outlet of the gas storage device.
5. The gas supplementing system according to claim 3, wherein the gas supplementing pipeline is provided with a safety valve downstream of the gas storage device.
6. The gas supplementing system according to claim 1, wherein the control unit is configured to control the gas supplementing system not to supplement gas to the diesel engine when the operation load is greater than or equal to a load preset value.
7. The gas supplementing system of claim 1, wherein the control unit is configured to not supplement gas to the diesel engine when the operating load is less than a load preset value and the load magnitude is less than a load magnitude preset value.
8. The gas supplementing system of claim 1, wherein the control unit is configured to supplement gas to the diesel engine when the operating load is less than a preset load magnitude and the load magnitude is greater than or equal to a preset load magnitude.
9. The gas supplementing system according to claim 8, wherein the control unit is configured to control the number of gas supplementing cycles for the gas supplementing system to supplement gas to the diesel engine according to the magnitude of the loading load.
10. The gas supplementing system according to claim 1, wherein the control unit is further configured to cause the gas supplementing system to supplement gas to the diesel engine at the time of intake of the diesel engine, and the gas supplementing of the gas supplementing system is started before an intake valve of the diesel engine is opened and the gas supplementing of the gas supplementing system is stopped before the intake valve of the diesel engine is closed.
11. An air supplement control method for a generator set including a diesel engine and a generator using the air supplement system according to any one of claims 1 to 10, the diesel engine providing a driving force to the generator, the air supplement control method comprising the steps of:
judging a loading area, comparing the running load of the diesel engine with a preset load value to judge whether the air supplementing system supplements air to the diesel engine, and
and judging the loading load amplitude, namely comparing the loading load amplitude of the diesel engine with a preset value of the loading load amplitude to judge whether the air supplementing system supplements air to the diesel engine.
12. The method of claim 11, wherein in the step of determining the loading area, when the operating load is greater than or equal to the preset load value, the gas supplementing system does not supplement gas to the diesel engine.
13. The method of claim 11, wherein the step of determining the magnitude of the loading load is subsequent to the step of determining the loading area.
14. The method for controlling air make-up according to claim 13, wherein in the step of judging the load area, when the operation load is smaller than the preset load value, the step of judging the magnitude of the load is performed.
15. The gas supplementing control method according to claim 14, wherein in the step of judging the magnitude of the loading load, when the magnitude of the loading load is smaller than the preset value of the magnitude of the loading load, the gas supplementing system does not supplement gas to the diesel engine.
16. The gas supplementing control method according to claim 14, wherein in the step of judging the magnitude of the loading load, when the magnitude of the loading load is greater than or equal to the preset value of the magnitude of the loading load, the gas supplementing system supplements gas to the diesel engine.
17. The gas supplementing control method according to claim 13, wherein the number of gas supplementing cycles for the gas supplementing system to supplement gas to the diesel engine is controlled according to the magnitude of the loading load.
18. The gas compensation control method of claim 11, wherein the gas compensation system compensates gas to the diesel engine by controlling the opening of a gas compensation nozzle.
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| CN111894771B (en) * | 2020-07-22 | 2021-08-06 | 东风商用车有限公司 | Engine air inlet system, engine, vehicle and air inlet method |
| CN112780403B (en) * | 2021-03-04 | 2022-04-29 | 哈尔滨工程大学 | Device and method for improving transient characteristics of high-power V-shaped marine diesel engine based on main pipe independent air supply |
| CN112780402B (en) * | 2021-03-04 | 2022-04-05 | 哈尔滨工程大学 | Multi-point sequential air supplement device and method for high-power marine diesel engine |
| CN112780404B (en) * | 2021-03-04 | 2022-03-18 | 哈尔滨工程大学 | Single-row air supplement device and method for high-power V-shaped marine diesel engine |
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| US4625281A (en) * | 1984-08-15 | 1986-11-25 | Motorola, Inc. | Engine load transient compensation system |
| CN100363608C (en) * | 2005-03-07 | 2008-01-23 | 天津大学 | Device and method for quick gas supply when diesel engine accelerating |
| CN201133283Y (en) * | 2007-12-26 | 2008-10-15 | 奇瑞汽车股份有限公司 | Device for improving internal-combustion engines air admittance |
| EP2462328B1 (en) * | 2009-08-03 | 2013-07-03 | ETH Zurich | Turbocharged reciprocating piston engine having a connected pressure tank for bridging turbo lag, and method for operating said engine |
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| DE102014222446A1 (en) * | 2014-11-04 | 2016-05-04 | Bayerische Motorenwerke Aktiengesellschaft | Internal combustion engine |
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