CN112798281A - Device and method for simulating complete machine air inlet waveform by single cylinder - Google Patents
Device and method for simulating complete machine air inlet waveform by single cylinder Download PDFInfo
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Abstract
The invention discloses a device and a method for simulating the whole air inlet waveform by a single cylinder. The device comprises a single cylinder, an air inlet pipe, a piston connecting rod module, a driving module, a pressure monitoring module and a control module. The air inlet pipe is connected to the single cylinder; one end of the piston connecting rod module is connected to the air inlet pipe and is used for adjusting the pressure wave of the air at the outlet of the air inlet pipe; the driving module is connected to the other end of the piston connecting rod module and used for driving the piston connecting rod module to move; the pressure monitoring module is connected to the air inlet pipe and used for monitoring pressure waves at the outlet of the air inlet pipe; the control module is respectively in signal connection with the driving module and the pressure monitoring module, is configured to acquire a monitoring signal of the pressure monitoring module, and is configured to control the action of the driving module according to the monitoring signal. The device for simulating the whole air inlet waveform by the single cylinder has a simple integral structure, is convenient to control, is beneficial to ensuring the timeliness of control, and improves the accuracy and reliability of the whole relevant performance of the single cylinder simulator.
Description
Technical Field
The invention relates to a device and a method for simulating the whole air inlet waveform by a single cylinder.
Background
The single cylinder is adopted to simulate the air inlet of the whole machine, so that the workload of the whole machine test can be greatly reduced, and the cost can be effectively reduced. Particularly, in the processes of development of a new machine type, improvement and reinforcement of the existing machine type or research and development of a new technology, when a high reinforcement index or a high performance index with low technology maturity and high research risk is related, a means of simulating a complete machine by using a single cylinder is necessary for testing.
The existing device for simulating the air intake of the whole single-cylinder engine generally adopts the structure that an air intake manifold similar to the whole single-cylinder engine is arranged on a cylinder cover of the single-cylinder engine, or directly adopts a multi-cylinder air intake manifold, and then controls the air of each air intake branch pipe by using an electromagnetic valve. The electromagnetic valve has the advantages that the structure is complex, the cost is high, the opening and closing response speed of the existing electromagnetic valve cannot keep up with the opening and closing speed of the diesel engine valve, and the larger the drift diameter of the electromagnetic valve is, the slower the response speed is, so that the control requirement cannot be met.
To this end, it is desirable to provide an apparatus and method for simulating a complete engine intake waveform with a single cylinder to at least partially solve the problems in the related 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 problem, according to a first aspect of the present invention, there is provided an apparatus for simulating a whole engine intake waveform with a single cylinder, the apparatus for simulating the whole engine intake waveform with the single cylinder comprising:
a single cylinder engine;
an intake pipe connected to the single cylinder engine;
one end of the piston connecting rod module is connected to the air inlet pipe and is used for adjusting pressure waves of air at an outlet of the air inlet pipe;
the driving module is connected to the other end of the piston connecting rod module and is used for driving the piston connecting rod module to move;
a pressure monitoring module connected to the intake pipe for monitoring the pressure waves at the outlet of the intake pipe; and
the control module is respectively in signal connection with the driving module and the pressure monitoring module, is configured to acquire a monitoring signal of the pressure monitoring module, and is configured to control the action of the driving module according to the monitoring signal.
According to the device for simulating the whole air inlet waveform of the single cylinder engine, the pressure monitoring module is arranged at the air inlet pipe, so that the pressure wave of the gas entering the single cylinder engine from the air inlet pipe can be monitored, the control module can acquire the related signal of the pressure wave monitored by the pressure monitoring module, then the control module can control the driving module to drive the piston connecting rod module to act according to the monitoring signal of the monitoring module, so that the pressure wave of the gas at the outlet of the air inlet pipe is adjusted, namely the pressure wave of the gas entering the single cylinder engine from the air inlet pipe is adjusted, the waveform of the pressure wave of the air entering the single cylinder engine is consistent with the waveform of the pressure wave of the air entering the whole engine, and the accuracy and the reliability of simulating. In addition, the device for simulating the whole air inlet waveform by the single cylinder has a simpler overall structure, is convenient to control, and is beneficial to ensuring the timeliness of control.
Optionally, the piston rod module comprises a piston tube, a piston and a crank rod mechanism, one end of the piston tube is connected to the air inlet tube, one end of the crank rod mechanism is connected to the driving module, and the other end of the crank rod mechanism is connected to the piston, so that the piston is driven to move in the piston tube under the action of the driving module.
Optionally, the drive module is configured as a motor, and the control module is configured to control the motor displacement and/or rotation speed according to the monitoring signal.
Optionally, the device for simulating the whole engine intake waveform with the single cylinder further includes a guide rail, the driving module is disposed on the guide rail, and the control module is configured to control the driving module to move along the guide rail according to the monitoring signal, so as to adjust the position of the driving module.
Optionally, the piston rod module and the pressure monitoring module are both respectively connected to the air inlet pipe at a position close to the single cylinder engine.
According to a second aspect of the present invention, there is provided a method for a device for simulating a whole engine intake waveform with a single cylinder as described above, the method comprising:
s1: acquiring a waveform of a first pressure wave of the whole air inlet through a whole machine simulation model or a whole machine experiment;
s2: acquiring a first amplitude A of the first pressure wave1With a first frequency omega1；
S3: obtaining a monitoring signal of the pressure monitoring module, wherein the monitoring signal comprises a second amplitude A of a second pressure wave of the air inlet pipe2And a second frequency omega2；
S4: according to said A1And said ω1Separately adjusting said A2And said ω2So that the waveform of the second pressure wave is similar to the waveform of the first pressure wave.
According to the method for simulating the whole air inlet waveform of the single cylinder machine, disclosed by the invention, after the waveform of the first pressure wave of the whole air inlet is obtained through whole machine simulation or whole machine experiment, the first amplitude A of the first pressure wave is obtained1And a first frequency omega1Then obtaining a second amplitude A of a second pressure wave of the air inlet pipe through the pressure monitoring module2And a second frequency omega2And according to the first amplitude A1And a first frequency omega1Respectively adjusting the second amplitude value A2And a second frequency omega2To regulate the waveform of a second pressure wave of the gas at the outlet of the inlet pipe, i.e. to regulate the second pressure of the gas entering the single-cylinder engine through the inlet pipeThe waveform of the force wave enables the waveform of the second pressure wave of the single-cylinder air inlet to be consistent with the waveform of the first pressure wave of the whole air inlet, and therefore the accuracy and the reliability of the single-cylinder air inlet for simulating the whole relevant performance can be improved.
Optionally, in the S4, the control module is according to the ω1And said ω2Adjusting the speed n of the drive module such that ω is equal to n π/302Close to said ω1。
Optionally, in the S4, the control module is according to the a1And said A2＝kω2d/cos(ω2L/a), by adjusting the position of the drive module to adjust L, and/or adjusting the rotational speed n of the drive module to adjust omega2So that said A is2Is close to the A1Wherein k is a proportionality coefficient, d is a length of a crank, L is a stroke of the piston, and a is a sound velocity.
Drawings
The following drawings of embodiments of the invention are included as part of the present invention for an understanding of the invention. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
In the drawings:
FIG. 1 is a schematic structural diagram of a single cylinder device for simulating a complete machine air intake waveform according to a preferred embodiment of the invention; and
FIG. 2 is a flow chart of a method for simulating a complete machine intake waveform with a single cylinder according to a preferred embodiment of the invention.
Description of reference numerals:
100: single cylinder machine air inlet waveform simulation device
110: single cylinder engine
120: air inlet pipe
130: piston connecting rod module
131: piston tube
132: piston
133: crank connecting rod mechanism
140: drive module
150: pressure monitoring module
160: control module
170: guide rail
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 embodiments of the invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in detail so as not to obscure the embodiments of the invention.
In order to provide a thorough understanding of the present invention, a detailed description will be provided in the following description to illustrate the apparatus and method of the present invention for simulating a whole engine intake waveform with a single cylinder. It is apparent that the practice of the invention is not limited to the specific details of apparatus and methods for a single cylinder engine to simulate a complete engine intake waveform, as will be appreciated by those skilled in the art. The following detailed description of preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.
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". The terms "upper", "lower", "front", "rear", "left", "right" and the like as used herein are for clarity of description only and are not limiting.
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.
Referring to fig. 1, the apparatus 100 for simulating the whole engine intake waveform with a single cylinder according to the present invention includes a single cylinder 110, an intake pipe 120, a pressure monitoring module 150, a piston rod module 130, a driving module 140, and a control module 160.
The intake pipe 120 is connected to the single cylinder 110 for supplying air for the operation of the single cylinder 110.
The pressure monitoring module 150 is connected to the intake pipe 120, preferably to a position of the intake pipe 120 near the single cylinder engine 110, for monitoring a pressure wave of the gas at the outlet of the intake pipe 120, that is, monitoring a waveform of a second pressure wave of the gas entering the single cylinder engine 110 from the intake pipe 120. The pressure monitoring module 150 may be configured as a pressure wave sensor to effectively simplify the structure of the pressure monitoring module 150 and facilitate monitoring of the waveform of the second pressure wave.
The control module 160 is in signal connection with the pressure monitoring module 150, and can read the monitoring signal of the pressure monitoring module 150, that is, read the waveform of the second pressure wave monitored by the monitoring module, and extract the second amplitude a of the second pressure wave by analyzing and calculating2And a second frequency omega2。
In addition, the control module 160 further stores a first amplitude a of a first pressure wave of the whole intake air obtained through a whole simulation model or a whole experiment1And a first frequency omega1. Second amplitude A of the second pressure wave is extracted at control module 1602And a second frequency omega2Then, the first amplitude A is obtained1And a first frequency omega1Comparing, analyzing and calculating to determine the second amplitude A2And a first amplitude A1And the second frequency ω2With a first frequency omega1The magnitude relationship of (1).
One end of the piston rod module 130 is connected to the intake pipe 120, preferably to a position of the intake pipe 120 near the single-rod machine; the other end is connected to the driving module 140 and can move under the driving of the driving module 140 to adjust the pressure wave at the outlet of the air inlet pipe 120, namely, adjust the waveform of the second pressure wave of the air entering the single cylinder engine 110 from the air inlet pipe 120. The driving module 140 may be configured as a motor to effectively simplify the structure of the driving module 140 and to facilitate the provision of the driving force to the piston rod module 130.
The modulation of the waveform of the second pressure wave by the piston rod module 130 is controlled by the control module 160 based on the monitoring signal from the pressure monitoring module 150. That is, the control module 160 is in signal connection with the driving module 140, and can control the action of the driving module 140 according to the monitoring signal of the pressure monitoring module 150, so as to drive the piston rod module 130 to move, so as to adjust the waveform of the second pressure wave.
Specifically, the piston connecting rod module 130 includes a piston tube 131, a piston 132, and a crank-connecting rod mechanism 133. One end, i.e., an open end, of the piston tube 131 is connected to the intake pipe 120. The crank-link mechanism 133 has one end connected to the driving module 140 and the other end connected to the piston 132 to drive the piston 132 to move in the piston tube 131 under the action of the driving module 140, so as to generate a disturbance wave propagating along the axial direction of the piston tube 131 toward the air inlet tube 120, so as to adjust the waveform of the second pressure wave.
The pressure of the gas at the outlet of the piston tube 131 may specifically be calculated according to the principles of nonlinear oscillation of the gas in the tube. Specifically, when the piston 132 moves in the piston tube 131, a periodic disturbance is generated to the gas in the piston tube 131, and thus a disturbance wave is generated, and the disturbance wave propagates backward along the axial direction of the piston tube 131. The velocity of the disturbance wave can be solved according to the aerodynamic viscosity equation (1),
where a is the speed of sound, x is the displacement of the perturbation wave motion, t is the time, and u is the velocity of the perturbation wave propagation.
The relationship between the velocity u of the disturbance wave and the pressure p satisfies the following equation (2),
boundary condition p-p for the left side of the joint piston tube 1310And the right-hand boundary condition x ═ L, the pressure p at the right-hand outlet of the piston tube 131 can be determined2Satisfies the following formula (3),
p2＝p0+2ρaA2cos(ω2t)cos(ω2L/a) (3)
wherein the content of the first and second substances,
A2＝kω2d/cos(ω2L/a) (4)
where k is the proportionality coefficient, d is the length of the crank, and L is the stroke of the piston 132.
By adjusting the waveform of the disturbance wave at the outlet of the piston tube 131, the waveform of the second pressure wave entering the single cylinder 110 from the intake pipe 120 can be adjusted accordingly. As can be seen from the above equation (3), the waveform of the second pressure wave is mainly composed of the second amplitude A2And a second frequency omega2And (6) determining. As can be seen from the above equation (4), the second amplitude A2Depending on the length d of the crank and the stroke L of the piston 132. The length d of the crank is generally a known constant value. The stroke L of the piston 132 may be adjusted by adjusting the position of the drive module 140. And the frequency of the disturbance wave, i.e. the frequency ω of the second pressure wave2Mainly controlled by the rotational speed n of the drive module 140, such as an electric motor, in particular in relation to,
ω2＝nπ/30 (5)
thus, by adjusting the position and the rotational speed n of the driving module 140, it is possible to achieve an adjustment of the second amplitude a of the second pressure wave2And a second frequency omega2And thereby the waveform of the second pressure wave.
The second amplitude A when the waveform of the second pressure wave is similar to that of the first pressure wave2And a first amplitude A1And a second frequency ω2With a first frequency omega1Respectively satisfy the following relational expressions,
A2＝A1 (6)
ω2＝ω1 (7)
therefore, the control module 160 acquires the second amplitude A of the second pressure wave through the pressure monitoring module 1502And a second frequency omega2Then, according to the first amplitude A of the first pressure wave1And a first frequency omega1Andthe above relations (5) - (7) can adjust the displacement and/or the rotation speed n of the driving module 140, such as the motor, to adjust the waveform of the second pressure wave, so that the waveform of the second pressure wave is consistent with the waveform of the first pressure wave, thereby improving the accuracy and reliability of the simulation of the whole machine correlation performance by using the single cylinder 110.
In the process of adjusting the waveform of the second pressure wave, reference may be made to the stroke of the piston 132 and the second amplitude a of the second pressure wave shown in table 1 in particular2The position of the driving module 140 is adjusted according to the corresponding relationship between the rotation speed n of the driving module 140 and the second frequency ω of the second pressure wave shown in table 22The corresponding relation of (a) adjusts the rotation speed n of the driving module 140.
It will be appreciated that tables 1 and 2 are only schematic representations of the stroke of the piston 132 and the second amplitude A of the second pressure wave2And the rotational speed of the driving module 140 and the second frequency ω of the second pressure wave2And (4) corresponding relation. During the actual regulation, the second amplitude A of the second pressure wave is mainly used2And a second frequency omega2Combined with a first amplitude A of the first pressure wave1And a first frequency omega1The position and speed n of the drive module 140 are adjusted.
TABLE 1 Stroke of piston and second amplitude A of second pressure wave2Corresponding relationship of
| Serial number | Stroke of piston | Second amplitude of the second pressure wave |
| 1 | L1 | A21 |
| 2 | L2 | A22 |
| 3 | L3 | A23 |
| 4 | L4 | A24 |
TABLE 2 rotational speed of the drive module and second frequency ω of the second pressure wave2Corresponding relationship of
| Serial number | Rotational speed of the drive module | Second frequency of the second pressure wave |
| 1 | n1 | ω21 |
| 2 | n2 | ω22 |
| 3 | n3 | ω23 |
| 4 | n4 | ω24 |
The second amplitude A is preferably adjusted during the adjustment of the position and speed n of the drive module 140 by the control module 160 to adjust the waveform of the second pressure wave2And a first amplitude A2And a second frequency omega2And a first frequency omega1The error between the first pressure wave and the second pressure wave is controlled within +/-5 percent, so that the consistency of the waveform of the second pressure wave and the waveform of the first pressure wave is effectively ensured, and the accuracy and the reliability of simulating the correlation performance of the whole machine by adopting the single cylinder 110 are further ensured.
In order to facilitate the adjustment of the position of the driving module 140, the apparatus 100 for simulating the whole engine intake waveform with a single cylinder preferably further includes a guide rail 170, and the driving module 140 is disposed on the guide rail 170, which can facilitate the control module 160 to control the driving module 140 to move along the guide rail 170 according to the monitoring signal, so as to accurately adjust the position of the driving module 140, and thus accurately adjust the stroke L of the piston 132.
The method of the apparatus 100 for single cylinder simulation of the whole engine intake waveform according to the present invention will be described with reference to fig. 2.
Before the second pressure wave at the outlet of the intake pipe 120 is adjusted, the waveform of the first pressure wave of the whole intake air needs to be obtained, that is, the step S1 is performed: and acquiring the waveform of the first pressure wave of the whole air inlet through a whole machine simulation model or a whole machine experiment.
After obtaining the waveform of the first pressure wave, the control module 160 performs step S2 by analyzing and calculating: obtaining a first amplitude A of a first pressure wave1With a first frequency omega1And storing the first amplitude A1With a first frequency omega1。
The control module 160 then monitors a second pressure wave at the outlet of the intake pipe 120 via the pressure monitoring module 150Line step S3: obtaining a monitoring signal of the pressure monitoring module 150, wherein the monitoring signal comprises a second amplitude A of a second pressure wave at the outlet of the inlet pipe 1202And a second frequency omega2。
The control module 160 then proceeds to step S4: according to a first amplitude A1And a first frequency omega1Respectively adjusting the second amplitude value A2And a second frequency omega2So that the waveform of the second pressure wave is similar to the waveform of the first pressure wave.
At S4, for the second frequency ω2Is mainly based on the first frequency omega1And equations (5) and (7) above, are implemented by the control module 160 adjusting the speed n of the driving module 140.
For the second amplitude A2Is adjusted mainly according to the first amplitude A1And equations (4) - (6) above, adjusting the position adjustment L of the drive module 140 by the control module 160, and/or adjusting the rotational speed n of the drive module 140 to adjust the second frequency ω2And (4) realizing.
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 "disposed" and the like, as used herein, may refer to one element being directly attached to another element or one element being attached to another element through intervening elements. 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. It will be appreciated by those skilled in the art that many variations and modifications may be made to the teachings of the invention, which fall within the scope of the invention as claimed.
Claims (8)
1. The device for simulating the whole engine air inlet waveform by the single cylinder is characterized by comprising the following steps of:
a single cylinder engine;
an intake pipe connected to the single cylinder engine;
the pressure monitoring module is connected to the air inlet pipe and used for monitoring pressure waves of the air at the outlet of the air inlet pipe;
the piston connecting rod module is connected to the air inlet pipe at one end and used for adjusting the pressure wave at the outlet of the air inlet pipe;
the driving module is connected to the other end of the piston connecting rod module and is used for driving the piston connecting rod module to move; and
the control module is respectively in signal connection with the driving module and the pressure monitoring module, is configured to acquire a monitoring signal of the pressure monitoring module, and is configured to control the action of the driving module according to the monitoring signal.
2. The device for simulating the whole air intake waveform of the single cylinder engine as claimed in claim 1, wherein the piston rod module comprises a piston tube, a piston and a crank rod mechanism, one end of the piston tube is connected to the air intake tube, one end of the crank rod mechanism is connected to the driving module, and the other end of the crank rod mechanism is connected to the piston, so that the piston is driven to move in the piston tube under the action of the driving module.
3. The apparatus for simulating whole engine intake waveform according to claim 1, wherein the driving module is configured as an electric motor, and the control module is configured to control the displacement and/or rotation speed of the electric motor according to the monitoring signal.
4. The apparatus for simulating the intake waveform of the whole engine with the single cylinder according to claim 3, further comprising a guide rail, wherein the driving module is disposed on the guide rail, and the control module is configured to control the driving module to move along the guide rail according to the monitoring signal so as to adjust the position of the driving module.
5. The apparatus for simulating the whole engine intake waveform with the single cylinder according to claim 1, wherein the piston rod module and the pressure monitoring module are both connected to the intake pipe at a position close to the single cylinder.
6. A method for the device for simulating the whole engine intake waveform by the single cylinder according to any one of claims 1 to 5, wherein the method comprises the following steps:
s1: acquiring a waveform of a first pressure wave of the whole air inlet through a whole machine simulation model or a whole machine experiment;
s2: acquiring a first amplitude A of the first pressure wave1With a first frequency omega1；
S3: obtaining a monitoring signal of the pressure monitoring module, wherein the monitoring signal comprises a second amplitude A of a second pressure wave of the air inlet pipe2And a second frequency omega2；
S4: according to said A1And said ω1Separately adjusting said A2And said ω2So that the waveform of the second pressure wave is similar to the waveform of the first pressure wave.
7. The method of claim 6, wherein in the S4, the control module is based on the ω1And said ω2Adjusting the speed n of the drive module such that ω is equal to n π/302Close to said ω1。
8. The method according to claim 6, wherein in the S4, the control module is according to the A1And said A2＝kω2d/cos(ω2L/a), by adjusting the position of the drive module to adjust L, and/or adjusting the rotational speed n of the drive module to adjust omega2So that said A is2Is close to the A1Wherein k is a proportionality coefficient, d is a length of a crank, L is a stroke of the piston, and a is a sound velocity.
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| CN106525440A (en) * | 2016-12-13 | 2017-03-22 | 中国船舶重工集团公司第七研究所 | Air inlet boundary control apparatus of single-cylinder engine and method thereof |
| CN108869125A (en) * | 2018-07-12 | 2018-11-23 | 燕山大学 | A kind of diesel engine intake and fuel system |
| CN111289095A (en) * | 2020-02-24 | 2020-06-16 | 南京俏声波动科技有限公司 | Sine pressure wave standard source for sensor calibration and working method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6804997B1 (en) * | 2003-08-14 | 2004-10-19 | Kyle Earl Edward Schwulst | Engine timing control with intake air pressure sensor |
| US20050234630A1 (en) * | 2004-04-20 | 2005-10-20 | Nissan Motor Co., Ltd. | Intake air parameter estimating device for internal combustion engine |
| CN104344959A (en) * | 2014-09-24 | 2015-02-11 | 中国船舶重工集团公司第七一一研究所 | Testing method and device of single cylinder engine simulation complete machine |
| CN106525440A (en) * | 2016-12-13 | 2017-03-22 | 中国船舶重工集团公司第七研究所 | Air inlet boundary control apparatus of single-cylinder engine and method thereof |
| CN108869125A (en) * | 2018-07-12 | 2018-11-23 | 燕山大学 | A kind of diesel engine intake and fuel system |
| CN111289095A (en) * | 2020-02-24 | 2020-06-16 | 南京俏声波动科技有限公司 | Sine pressure wave standard source for sensor calibration and working method thereof |
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