A device and method for attenuating pressure pulsations in a post-pressurization line

Abstract

The application discloses a device and method for attenuating pressure pulsation of a post-compression pipeline, wherein the device for attenuating pressure pulsation of the post-compression pipeline comprises an energy-absorbing assembly, a first pressure sensor and a controller, the energy-absorbing assembly comprises a balance cavity, a balance block, a branch pipe and a valve, the balance block divides the balance cavity into an upper cavity and a lower cavity, the upper cavity is communicated with the post-compression pipeline, the lower cavity is communicated with the post-compression pipeline through the branch pipe, and the valve is arranged on the branch pipe. The first pressure sensor collects the pressure of the post-compression pipeline, the controller compares the peak-peak value of the pressure pulsation obtained according to the pressure of the post-compression pipeline with a preset peak-peak value of the pressure pulsation, and the valve is closed when the peak-peak value of the pressure pulsation is greater than the preset peak-peak value of the pressure pulsation, thereby cutting off the communication between the lower cavity and the post-compression pipeline; under the action of the pressure difference between the upper cavity and the lower cavity, the balance block moves, converts the energy of the pressure fluctuation of the post-compression pipeline into kinetic energy and thermal energy of the balance block, and reduces the impact of the pressure fluctuation on the post-compression pipeline and an air filter.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of generators, in particular to a device and method for attenuating pressure pulsation of a post-pressurization pipeline. BACKGROUND

[0002] The working condition of diesel engine of a generator set is stable, and a traditional mechanical pump diesel engine can meet the demand. Compared with an electronically controlled fuel pump, the mechanical pump diesel engine is more inexpensive, and thus the mechanical pump diesel engine still has a certain amount of retention in the market.

[0003] The air entering the cylinder of the mechanical pump diesel engine is pre-compressed by a supercharger, and then supplied into the intake pipe of the cylinder through a post-pressurization pipeline. Since the post-pressurization pipeline between the supercharger and the cylinder is short, the pressure fluctuation of the post-pressurization pipeline is large, and the post-pressurization pipeline and the air filter are impacted to generate abnormal sound.

[0004] Therefore, how to reduce the abnormal sound of the post-pressurization pipeline and the air filter becomes a technical problem to be solved by those skilled in the art. SUMMARY

[0005] The present application provides a device for attenuating pressure pulsation of a post-pressurization pipeline to reduce the abnormal sound of the post-pressurization pipeline and the air filter. The present application also provides a method for attenuating pressure pulsation of a post-pressurization pipeline.

[0006] To achieve the above-mentioned purpose, the present application provides a device for attenuating pressure pulsation of a post-pressurization pipeline, characterized in that it comprises an energy-absorbing assembly, a first pressure sensor and a controller,

[0007] The energy-absorbing assembly comprises a balance cavity, a balance block, a branch pipe and a valve, the balance block is arranged in the balance cavity, and the balance cavity is divided into an upper cavity and a lower cavity by the balance block, the upper cavity is communicated with the post-pressurization pipeline, the lower cavity is communicated with the post-pressurization pipeline through the branch pipe, and the valve is arranged on the branch pipe,

[0008] The first pressure sensor is used for detecting the pressure of the post-pressurization pipeline,

[0009] The controller is in communication connection with the first pressure sensor and the valve, is used for obtaining a peak-to-peak value of pressure pulsation according to the pressure, and controls the valve to be closed when the peak-to-peak value of pressure pulsation exceeds a preset peak-to-peak value of pressure pulsation, so as to convert the energy of pressure fluctuation of the post-pressurization pipeline into kinetic energy of the balance block.

[0010] Preferably, in the above-mentioned device for attenuating pressure pulsation of a post-pressurization pipeline, the energy-absorbing assembly further comprises a spring-damping shock absorber, and the spring-damping shock absorber is connected with the balance block.

[0011] Preferably, in the device for attenuating pressure pulsation of post-pressure pipeline as described above, the spring-damper shock absorber is installed in the lower cavity through a hole plate.

[0012] Preferably, in the device for attenuating pressure pulsation of post-pressure pipeline as described above, a second pressure sensor for detecting the lower cavity pressure of the lower cavity is further included, and the second pressure sensor is in communication connection with the controller,

[0013] The controller can be further used to obtain a second average pressure of the lower cavity according to the lower cavity pressure, and obtain a first average pressure of the upper cavity according to the post-pressure pipeline pressure, and control the valve to keep closed when the pressure difference between the second average pressure and the first average pressure does not exceed a preset pressure difference.

[0014] Preferably, in the device for attenuating pressure pulsation of post-pressure pipeline as described above, the balance cavity is in communication with the pressure expansion cavity of the post-pressure pipeline.

[0015] A method for attenuating pressure pulsation of post-pressure pipeline, which is applicable to the device for attenuating pressure pulsation of post-pressure pipeline as described in any one of the above solutions, comprises:

[0016] S1, detecting the pressure of the post-pressure pipeline of the supercharger and obtaining the peak-to-peak value of the pressure pulsation of the post-pressure pipeline per unit time;

[0017] S2, comparing the peak-to-peak value of the pressure pulsation with a preset peak-to-peak value of pressure pulsation, and absorbing the energy of the pressure fluctuation of the post-pressure pipeline by the energy-absorbing assembly when the peak-to-peak value of the pressure pulsation is greater than the preset peak-to-peak value of pressure pulsation.

[0018] Preferably, in the method for attenuating pressure pulsation of post-pressure pipeline as described above, in the S2, the energy-absorbing assembly comprises a balance cavity, a balance block, a branch pipe and a valve, the balance block is arranged in the balance cavity and is used to separate the balance cavity into an upper cavity and a lower cavity, the upper cavity is in communication with the post-pressure pipeline, the lower cavity is in communication with the post-pressure pipeline through the branch pipe, and the valve is arranged on the branch pipe,

[0019] The energy-absorbing assembly absorbs the energy of the pressure fluctuation of the post-pressure pipeline in the S2 specifically by closing the valve, so that the balance block moves up and down under the action of the pressure difference between the gas pressures of the upper cavity and the lower cavity, and converts the energy of the pressure fluctuation of the post-pressure pipeline into kinetic energy of the balance block.

[0020] Preferably, in the method for attenuating pressure pulsation of post-pressure pipeline as described above, the method further comprises S3,

[0021] acquire a first average pressure of the post-compression pipeline and a second average pressure of a lower cavity of the energy-absorbing assembly in a unit time, and compare the first average pressure with the second average pressure,

[0022] when a pressure difference between the second average pressure and the first average pressure is less than a preset pressure difference, control the valve to remain closed, when the pressure difference between the second average pressure and the first average pressure is greater than the preset pressure difference, control the valve to open, and repeat the S1 and the S2.

[0023] Preferably, in the method for attenuating pressure pulsation of the post-compression pipeline, the method further comprises S4,

[0024] According to the pressure of the post-compression pipeline, the rotational speed of the supercharger is acquired, and when the rotational speed of the supercharger exceeds a rated rotational speed, an overload warning is triggered.

[0025] Preferably, in the method for attenuating pressure pulsation of the post-compression pipeline, the acquiring of the rotational speed of the supercharger according to the pressure of the post-compression pipeline in the S4 specifically comprises,

[0026] According to the pressure of the post-compression pipeline, a frequency spectrum of the pressure of the post-compression pipeline is acquired;

[0027] The frequency spectrum is divided into a plurality of frequency segments, and an effective value of each frequency segment is acquired;

[0028] The plurality of effective values are normalized, a peak frequency in a frequency segment with the maximum contrast is extracted, and the rotational speed of the supercharger is calculated according to the peak frequency.

[0029] The device for attenuating pressure pulsation of the post-compression pipeline provided by the embodiment of the application comprises an energy-absorbing assembly, a first pressure sensor and a controller. The energy-absorbing assembly comprises a balance cavity, a balance block, a branch pipe and a valve. The balance block is arranged in the balance cavity, and the balance block divides the balance cavity into an upper cavity and a lower cavity. The upper cavity is in communication with the post-compression pipeline, and the lower cavity is in communication with the post-compression pipeline through the branch pipe. The valve is arranged on the branch pipe and is used to control the communication between the post-compression pipeline and the lower cavity. The first pressure sensor acquires the pressure of the post-compression pipeline in real time and feeds back the pressure to the controller. The controller acquires a peak-to-peak value of pressure pulsation of the post-compression pipeline according to the pressure acquired by the first pressure sensor, compares the peak-to-peak value of pressure pulsation with a preset peak-to-peak value of pressure pulsation, controls the valve to close when the peak-to-peak value of pressure pulsation is greater than the preset peak-to-peak value of pressure pulsation, cuts off the communication between the lower cavity and the post-compression pipeline, and forms a closed cavity with the lower cavity. The balance block moves under the action of the pressure difference between the upper cavity and the lower cavity, converts the energy of pressure fluctuation of the post-compression pipeline into kinetic energy and thermal energy of the balance block, reduces the impact of pressure fluctuation on the post-compression pipeline and the air filter, and further reduces the abnormal sound of the post-compression pipeline and the air filter.

[0030] Some embodiments of the present application disclose a method for attenuating pressure pulsation of post-pressure pipeline, which is suitable for the device for attenuating pressure pulsation of post-pressure pipeline. Since the device for attenuating pressure pulsation of post-pressure pipeline has the above technical effects, the method for attenuating pressure pulsation of post-pressure pipeline suitable for the device also has the same technical effects, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some examples or embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor based on the provided drawings, and the present application can also be applied to other similar scenarios based on the provided drawings. Unless it is obvious from the language environment or otherwise stated, the same reference numbers in the drawings represent the same structure or operation.

[0032] Figure 1 is a structural schematic diagram of the energy-absorbing assembly of the device for attenuating pressure pulsation of post-pressure pipeline disclosed by the present application;

[0033] Figure 2 is a front view of the energy-absorbing assembly of the device for attenuating pressure pulsation of post-pressure pipeline disclosed by the present application;

[0034] Figure 3 is a normalized histogram;

[0035] Figure 4 is a frequency spectrum diagram;

[0036] Figure 5 is a flow chart of the method for attenuating pressure pulsation of post-pressure pipeline disclosed by the present application.

[0037] The drawings are described as follows:

[0038] 1-first pressure sensor; 2-balance cavity; 3-balance block; 4-branch pipe; 5-valve; 6-spring-damping shock absorber; 7-orifice plate; 8-second pressure sensor; 9-pressure expansion cavity. DETAILED DESCRIPTION

[0039] The present application will be further described in detail below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related application, but not to limit the application. The described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0040] It should be noted that only parts related to the application are shown in the drawings for the convenience of description. The embodiments in the present application and the features in the embodiments can be combined with each other arbitrarily without conflict, as long as the combined technical features are not contradictory. All feasible combinations of features are the technical contents expressly described herein. Any one of the features included in the same sentence can be applied independently, and does not have to be applied together with other features.

[0041] As indicated in the present application and claims, unless the context clearly suggests otherwise, the words “one”, “an”, “a”, and / or “the” do not specify a singular number, but can also include a plural number. Generally, the terms “comprise” and “include” only indicate the inclusion of the steps and elements explicitly identified, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements. The element defined by the phrase “comprising a” does not exclude the presence of additional identical elements in the process, method, product or device comprising the element.

[0042] In the description of the embodiments of the present application, “ / ” represents or unless otherwise specified, for example, A / B can represent A or B; “and / or” herein only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent: A alone, A and B together, and B alone. In addition, in the description of the embodiments of the present application, “multiple” means two or more than two.

[0043] Please refer to Figures 1-5 .

[0044] The scheme discloses a device for attenuating pressure pulsation of a post-pressure pipeline, comprising an energy absorption assembly, a first pressure sensor 1 and a controller, wherein,

[0045] The energy absorption assembly comprises a balance cavity 2, a balance block 3, a branch pipe 4 and a valve 5, the balance block 3 is arranged in the balance cavity 2, the balance block 3 divides the balance cavity 2 into an upper cavity and a lower cavity, the upper cavity is communicated with the post-pressure pipeline, the lower cavity is communicated with the post-pressure pipeline through the branch pipe 4, and the valve 5 is arranged on the branch pipe 4 and used for controlling the communication between the post-pressure pipeline and the lower cavity;

[0046] The first pressure sensor 1 is used for detecting the pressure of the post-pressure pipeline, the upper cavity is communicated with the post-pressure pipeline, and the first pressure sensor 1 can be arranged on the post-pressure pipeline or the upper cavity;

[0047] The controller is in communication connection with the first pressure sensor 1 and the valve 5, used for obtaining the pressure pulsation peak-to-peak value of the upper cavity according to the pressure, and controlling the valve 5 to be closed when the pressure pulsation peak-to-peak value exceeds the preset pressure pulsation peak-to-peak value, so as to cut off the communication between the lower cavity and the post-pressure pipeline, and the lower cavity forms a closed cavity, and the balance block 3 moves under the action of the pressure difference between the upper cavity and the lower cavity, so as to convert the energy of the pressure fluctuation of the post-pressure pipeline into kinetic energy and thermal energy of the balance block 3.

[0048] When the pressure pulsation peak-to-peak value is less than the preset pressure pulsation peak-to-peak value, the valve 5 remains open, the lower cavity is in communication with the post-pressure pipeline, the pressure of the upper cavity is equal to the pressure of the lower cavity, and the pressure of the upper cavity and the pressure of the lower cavity are both the pressure of the post-pressure pipeline, and the balance block 3 is not moved.

[0049] The device for attenuating the pressure pulsation of the post-pressure pipeline disclosed in the scheme, the first pressure sensor 1 collects the pressure of the post-pressure pipeline in real time, and feeds back the pressure to the controller, the controller obtains the pressure pulsation peak-to-peak value of the post-pressure pipeline according to the pressure collected by the first pressure sensor 1, and compares the pressure pulsation peak-to-peak value with the preset pressure pulsation peak-to-peak value, and controls the energy absorption component to absorb the energy of the pressure fluctuation of the post-pressure pipeline when the pressure pulsation peak-to-peak value is greater than the preset pressure pulsation peak-to-peak value, so as to reduce the impact of the pressure fluctuation on the post-pressure pipeline and the air filter, and further reduce the abnormal sound of the post-pressure pipeline and the air filter.

[0050] Specifically, when the pressure of the upper cavity is greater than the pressure of the lower cavity, the balance block 3 moves to the lower cavity under the action of the pressure difference between the upper cavity and the lower cavity, and when the pressure of the upper cavity is less than the pressure of the lower cavity, the balance block 3 moves to the upper cavity under the action of the pressure difference between the upper cavity and the lower cavity.

[0051] The device for attenuating the pressure pulsation of the post-pressure pipeline disclosed in the scheme automatically controls the energy absorption component to absorb the energy of the pressure fluctuation of the post-pressure pipeline, and has high reliability in reducing the abnormal sound of the post-pressure pipeline and the air filter.

[0052] In some embodiments, the first pressure sensor 1 is a high-frequency pressure sensor. The high-frequency pressure sensor is made of semiconductor silicon with extremely high Young's modulus of elasticity and excellent mechanical properties, so that the sensor has high inherent frequency, high dynamic frequency response, wide range coverage, good product stability, small size and other advantages.

[0053] As shown in Figure 1 and Figure 2 , the first end of the balance cavity 2 is an open end, the open end of the balance cavity 2 is in communication with the post-pressure pipeline, the second end of the balance cavity 2 is a closed end, and the pressure fluctuation of the post-pressure pipeline is transmitted into the balance cavity 2 through the open end of the balance cavity 2;

[0054] The balance block 3 is in sealing connection with the balance cavity 2, the upper cavity and the lower cavity are not in communication, the upper cavity is in communication with the post-pressure pipeline through the open end, the lower cavity is in communication with the post-pressure pipeline through the branch pipe 4, and the balance block 3 is provided with a sealing ring in some embodiments, so that the balance block 3 is in sealing connection with the balance cavity 2;

[0055] The valve 5 is arranged on the branch pipe 4, the lower cavity is in communication with the post-pressure pipeline when the valve 5 is opened, and the lower cavity is not in communication with the post-pressure pipeline when the valve 5 is closed.

[0056] In some embodiments, the preset pressure fluctuation peak-to-peak value is 20 kPa, the valve 5 is closed when the pressure fluctuation peak-to-peak value exceeds 20 kPa, and the valve 5 remains opened when the pressure fluctuation peak-to-peak value does not exceed 20 kPa.

[0057] Optionally, the valve 5 is a butterfly valve.

[0058] In some embodiments, the energy-absorbing assembly further comprises a spring-damping shock absorber 6 connected with the balance block 3. When the pressure in the upper cavity is greater than the pressure in the lower cavity, the balance block 3 moves to the lower cavity under the action of the pressure difference between the upper cavity and the lower cavity, and the spring-damping shock absorber 6 absorbs energy. When the pressure in the upper cavity is less than the pressure in the lower cavity, the balance block 3 moves to the upper cavity under the action of the pressure difference between the upper cavity and the lower cavity, and the spring-damping shock absorber 6 releases energy.

[0059] In the embodiments in which the energy-absorbing assembly has the balance block 3 and the spring-damping shock absorber 6, the pressure fluctuation of the post-pressure pipeline is converted into mechanical movement of the balance block 3, elastic potential energy of the spring-damping shock absorber 6, and heat energy generated by friction between the balance block 3 and the balance cavity 2. The energy of the pressure fluctuation is dissipated in the form of elastic potential energy of the spring-damping shock absorber 6, mechanical energy of the balance block 3, and heat energy generated by friction between the balance block 3 and the balance cavity 2, so as to attenuate the pressure fluctuation.

[0060] The controller processes the pressure detected by the first pressure sensor 1 to obtain a pressure fluctuation peak-to-peak value, and controls the opening and closing of the valve 5 according to the comparison result of the pressure fluctuation peak-to-peak value and the preset pressure fluctuation peak-to-peak value, so as to realize the automatic operation of the device for attenuating the post-pressure pipeline pressure fluctuation, which is simple and flexible to operate.

[0061] In some embodiments, the device for attenuating the post-pressure pipeline pressure fluctuation disclosed in the present scheme further comprises a second pressure sensor 8 for detecting the pressure in the lower cavity, and the second pressure sensor 8 is in communication connection with the controller.

[0062] The controller can also be used to obtain a second average pressure of the lower cavity according to the pressure in the lower cavity, and a first average pressure of the post-pressure pipeline, and compare the second average pressure and the first average pressure, so as to control the valve 5 to remain closed when the pressure difference between the second average pressure and the first average pressure does not exceed a preset pressure difference.

[0063] When the pressure difference between the second average pressure and the first average pressure is greater than the preset pressure difference, the control valve 5 is opened, the pressure of the post-pipeline is re-detected by the first pressure sensor 1, the controller obtains the peak-to-peak value of the pressure pulsation according to the pressure of the post-pipeline, and then performs comparison to determine whether the valve 5 is closed.

[0064] In some embodiments, the spring-damping shock absorber 6 is installed in the lower cavity through the orifice plate 7, the orifice plate 7 is located below the balance block 3, the position of the spring-damping shock absorber 6 in the lower cavity is fixed, and it is ensured that only the spring of the spring-damping shock absorber 6 is compressed when the balance block 3 moves.

[0065] The balance cavity 2 is in communication with the pressure-expanding cavity 9 of the post-pipeline.

[0066] The controller can also obtain the rotating speed of the supercharger according to the pressure of the post-pipeline, and then determine the engine load according to the rotating speed of the supercharger, when the rotating speed of the supercharger exceeds the rated rotating speed, it is determined that the engine is operating under overload, and a warning is given; when the rotating speed of the supercharger does not exceed the rated rotating speed, the engine will not operate under overload. It should be noted that the rated rotating speed is the actual working rotating speed of the supercharger under the rated / overload steady state condition.

[0067] Specifically, the pressure of the post-pipeline is detected by the first pressure sensor 1, and the controller obtains the frequency spectrum of the post-pipeline according to the pressure of the post-pipeline;

[0068] The frequency is divided into a plurality of frequency bands, and the effective value of each frequency band is obtained;

[0069] The plurality of effective values are normalized, the peak frequency in the frequency band with the maximum contrast is extracted, and the rotating speed of the supercharger is calculated according to the peak frequency.

[0070] Specifically, the effective value can be obtained according to the formula sqrt(x1 2 +x2 2 +x3 2 +……+x n-1 2 +x n 2 ), wherein x1 2 , x2 2 , x3 2 , …, x n-1 2 , and x n 2 are the amplitudes at different frequencies in the frequency spectrum;

[0071] Linear normalization (X-X min ) / (X max -X min), where X is the effective value calculated for each frequency band, X min is the minimum effective value in all frequency bands, X max It is the maximum value of the effective value in all frequency bands.

[0072] The normalized value is between 0 and 1. Assuming that the spectrum is divided into N frequency segments, the number of effective values ​​obtained is also N, and the number of values ​​between 0 and 1 obtained after normalization is also N. If the number of values ​​exceeding a first preset value (0.6 in some embodiments, 0.6 is an experimental experience value and is manually set) among the N values ​​is less than or equal to n (2 in some embodiments), it is considered that the supercharger speed does not exceed the calibration speed. When n=1, the middle frequency of the frequency segment exceeding the first preset value is selected to calculate the supercharger speed. When n=2, and the pressure peak is located between two frequency segments, the normalized values ​​of these two frequency segments are both greater than 0.6. At this time, it is necessary to take the pressure peak between the two frequency segments to calculate the supercharger speed. If the number of values ​​exceeding 0.6 among the N numbers exceeds n, it is considered that the supercharger speed exceeds the calibration speed.

[0073] like Figure 3 and Figure 4 As shown, the spectrum of 12000~18000Hz is divided into 10 segments with a width of 500Hz, and 10 effective values ​​are obtained. After normalization, the values ​​between 0 and 1 are also 10. The normalized results are shown in the bar graph. The frequency 1 in the bar graph corresponds to 12000Hz-12500Hz, the frequency 2 corresponds to 12500Hz-13000Hz, the frequency 3 corresponds to 13000Hz-13500Hz, the frequency 4 corresponds to 13500Hz-14000Hz, the frequency 5 corresponds to 14000Hz-14500Hz, the frequency 6 corresponds to 14500Hz-15000Hz, and the frequency 7 corresponds to 15000Hz-15500Hz. The frequency corresponding to 8 is 15500Hz-16000Hz, the frequency corresponding to 9 is 16500Hz-17000Hz, and the frequency corresponding to 10 is 17500Hz-18000Hz. The data of the seventh group of data after normalization is 1. The seventh group of data is the frequency segment with the largest contrast. The seventh group of data is the frequency interval where the maximum value is located after normalization. The peak frequency in the frequency segment of the seventh group of data is used to calculate the supercharger speed.

[0074] The device for attenuating pressure pulsation in a post-compression pipeline disclosed in this solution can adjust in real time according to the different pressures in the post-compression pipeline, attenuating pressure pulsation under different loads. Some embodiments of this application disclose a method for attenuating pressure pulsation in a post-compression pipeline, applicable to the device for attenuating pressure pulsation in a post-compression pipeline, comprising:

[0075] S1, detecting the pressure of the post-pressurizer pipeline and obtaining the peak-to-peak value of the pressure fluctuation of the post-pressurizer pipeline per unit time;

[0076] S2, comparing the peak-to-peak value of the pressure fluctuation with a preset peak-to-peak value of the pressure fluctuation, and absorbing the energy of the pressure fluctuation of the post-pressurizer pipeline by the energy-absorbing assembly when the peak-to-peak value of the pressure fluctuation is greater than the preset peak-to-peak value of the pressure fluctuation.

[0077] When the peak-to-peak value of the pressure fluctuation is less than the preset peak-to-peak value of the pressure fluctuation, the post-pressurizer pipeline has a small abnormal sound, and the reduction can not be performed. When the peak-to-peak value of the pressure fluctuation is greater than the preset peak-to-peak value of the pressure fluctuation, the post-pressurizer pipeline has a large abnormal sound, and the reduction needs to be performed.

[0078] The method for attenuating the pressure fluctuation of the post-pressurizer pipeline disclosed in the scheme first detects the pressure of the post-pressurizer pipeline of the supercharger, obtains the pressure change curve of the post-pressurizer pipeline, and obtains the peak-to-peak value of the pressure fluctuation according to the detected pressure of the post-pressurizer pipeline. Then, the obtained peak-to-peak value of the pressure fluctuation is compared with a preset peak-to-peak value of the pressure fluctuation, so that when the peak-to-peak value of the pressure fluctuation exceeds the preset peak-to-peak value of the pressure fluctuation, the energy of the pressure fluctuation is absorbed by the energy-absorbing assembly. The energy of the pressure fluctuation is converted into mechanical energy to reduce the impact of the pressure fluctuation on the post-pressurizer pipeline and the air filter, and then the abnormal sound of the post-pressurizer pipeline and the air filter is reduced.

[0079] Specifically, the post-pressurizer pipeline detects the pressure of the post-pressurizer pipeline of the supercharger through the first pressure sensor 1, and converts the pressure into a pressure signal and transmits the pressure signal to the controller. The controller processes the pressure signal to obtain the peak-to-peak value of the pressure fluctuation. The peak-to-peak value of the pressure fluctuation refers to the difference between the maximum value and the minimum value of the pressure fluctuation signal within a certain time.

[0080] The first pressure sensor 1 is a high-frequency pressure sensor. The high-frequency pressure sensor is made of semiconductor silicon with extremely high Young's modulus of elasticity and excellent mechanical properties, so that the sensor has high inherent frequency, high dynamic frequency response, wide range coverage, good product stability, small size and other advantages.

[0081] In the scheme S2, the energy-absorbing assembly includes a balance cavity 2, a balance block 3, a branch pipe 4 and a valve 5. The balance block 3 is arranged in the balance cavity 2 and is used to separate the balance cavity 2 into an upper cavity and a lower cavity. The upper cavity is in communication with the post-pressurizer pipeline, and the lower cavity is in communication with the post-pressurizer pipeline through the branch pipe 4. The valve 5 is arranged on the branch pipe 4.

[0082] In the scheme S2, the energy-absorbing assembly absorbs the energy of the pressure fluctuation of the post-pressurizer pipeline. Specifically, the valve 5 is closed, so that the balance block 3 moves up and down under the action of the pressure difference between the gas pressures of the upper cavity and the lower cavity. The energy of the pressure fluctuation of the post-pressurizer pipeline is converted into the kinetic energy of the balance block 3.

[0083] The controller is in communication connection with the first pressure sensor 1 and the valve 5, used for acquiring the pressure pulsation peak-to-peak value of the upper cavity according to the pressure, and controlling the valve 5 to be closed when the pressure pulsation peak-to-peak value exceeds the preset pressure pulsation peak-to-peak value, so as to cut off the communication between the lower cavity and the post-pressure pipeline, and the lower cavity forms a closed cavity, and the balance block 3 moves under the action of the pressure difference between the upper cavity and the lower cavity, so as to convert the energy of the pressure fluctuation of the post-pressure pipeline into kinetic energy and thermal energy of the balance block 3.

[0084] When the pressure pulsation peak-to-peak value is less than the preset pressure pulsation peak-to-peak value, the valve 5 remains open, the lower cavity is in communication with the post-pressure pipeline, the pressure of the upper cavity is equal to the pressure of the lower cavity, and the pressure of the upper cavity and the pressure of the lower cavity are both the pressure of the post-pressure pipeline, and the balance block 3 is not moved.

[0085] The device for attenuating the pressure pulsation of the post-pressure pipeline disclosed in the scheme, the first pressure sensor 1 collects the pressure of the post-pressure pipeline in real time, and feeds back the pressure to the controller, the controller acquires the pressure pulsation peak-to-peak value of the post-pressure pipeline according to the pressure collected by the first pressure sensor 1, and compares the pressure pulsation peak-to-peak value with the preset pressure pulsation peak-to-peak value, and controls the energy absorption assembly to absorb the energy of the pressure fluctuation of the post-pressure pipeline when the pressure pulsation peak-to-peak value is greater than the preset pressure pulsation peak-to-peak value, so as to reduce the impact of the pressure fluctuation on the post-pressure pipeline and the air filter, and further reduce the abnormal sound of the post-pressure pipeline and the air filter.

[0086] Specifically, when the pressure of the upper cavity is greater than the pressure of the lower cavity, the balance block 3 moves to the lower cavity under the action of the pressure difference between the upper cavity and the lower cavity, and when the pressure of the upper cavity, i.e. the post-pressure pipeline, is less than the pressure of the lower cavity, the balance block 3 moves to the upper cavity under the action of the pressure difference between the upper cavity and the lower cavity.

[0087] The scheme converts the pressure fluctuation of the post-pressure pipeline into the mechanical movement of the balance block 3 and the thermal energy generated by the friction between the balance block 3 and the balance cavity 2, dissipates the energy of the pressure fluctuation as the mechanical energy of the balance block 3 and the thermal energy generated by the friction between the balance block 3 and the balance cavity 2, so as to attenuate the pressure fluctuation.

[0088] The method for attenuating the pressure pulsation of the post-pressure pipeline disclosed in the scheme further comprises S3,

[0089] Acquiring the first average pressure of the post-pressure pipeline and the second average pressure of the lower cavity of the energy absorption assembly in a unit time, and comparing the first average pressure and the second average pressure,

[0090] When the pressure difference between the second average pressure and the first average pressure is less than the preset pressure difference, controlling the valve 5 to remain closed, and when the pressure difference between the second average pressure and the first average pressure is greater than the preset pressure difference, controlling the valve 5 to be open, and repeating S1 and S2.

[0091] The method for attenuating the pressure pulsation of the post-pressure pipeline disclosed in the scheme further comprises S4,

[0092] According to the pressure of the post-press pipeline, the rotating speed of the supercharger is obtained, and when the rotating speed of the supercharger exceeds the rated rotating speed, an overload warning is triggered.

[0093] S4 is specifically, according to the pressure of the post-press pipeline, the frequency spectrum of the post-press pipeline pressure is obtained;

[0094] The frequency spectrum is divided into a plurality of frequency bands, and the effective value of each frequency band is obtained;

[0095] The plurality of effective values are normalized, the peak frequency in the frequency band with the maximum contrast is extracted, and the rotating speed of the supercharger is calculated according to the peak frequency.

[0096] Specifically, the effective value can be obtained according to the formula sqrt (x1 2 +x2 2 +x3 2 +……+x n-1 2 +x n 2 ), wherein x1 2 , x2 2 , x3 2 , …, x n-1 2 and x n 2 are the amplitudes at different frequencies in the frequency spectrum;

[0097] Linear normalization (X-X min ) / (X max -X min ) is adopted, wherein X is the effective value calculated by each frequency band, X min is the minimum value of the effective value in all frequency bands, and X max is the maximum value of the effective value in all frequency bands.

[0098] The normalized value is between 0 and 1. Assuming that the spectrum is divided into N frequency bands, the number of effective values obtained is also N, and the number of values between 0 and 1 obtained after normalization is also N. If the number of values greater than the first preset value (0.6 in some embodiments, which is an empirical value and is artificially set) in the N values is less than or equal to n (2 in some embodiments), it is considered that the speed of the supercharger does not exceed the rated speed. When n = 1, the middle frequency of the frequency band exceeding the first preset value is selected, and the speed of the supercharger is calculated. When n = 2, and the pressure peak is located between two frequency bands, the normalized values of the two frequency bands are greater than 0.6. At this time, the pressure peak between the two frequency bands needs to be taken to calculate the speed of the supercharger. If the number of values greater than 0.6 in the N values exceeds n, it is considered that the speed of the supercharger is normal, and no warning is given.

[0099] As shown in Figure 3 and Figure 4 , the spectrum of 12000-18000Hz is divided into 10 segments with a width of 500Hz, 10 effective values are obtained, and 10 values between 0 and 1 are obtained after normalization. The normalization result is shown in the column chart. In the column chart, 1 corresponds to the frequency of 12000-12500Hz, 2 corresponds to the frequency of 12500-13000Hz, 3 corresponds to the frequency of 13000-13500Hz, 4 corresponds to the frequency of 13500-14000Hz, 5 corresponds to the frequency of 14000-14500Hz, 6 corresponds to the frequency of 14500-15000Hz, 7 corresponds to the frequency of 15000-15500Hz, 8 corresponds to the frequency of 15500-16000Hz, 9 corresponds to the frequency of 16500-17000Hz, and 10 corresponds to the frequency of 17500-18000Hz. The normalized data of the seventh group is 1, the seventh group is the frequency band with the largest contrast, and the seventh group is the frequency interval with the largest normalized value. The center frequency (15250Hz) of the seventh group is used to calculate the speed of the supercharger.

[0100] The overload warning is only used to record and prompt the engine state, and does not affect the control of the energy absorption assembly or the operation of the engine.

[0101] The above description is only the preferred embodiment of the present application and the explanation of the technical principles of the application, and is not intended to limit the present application. The present application can be variously changed and modified by those skilled in the art. The application scope involved in the present application is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by the combinations of the above technical features or their equivalent features without departing from the above application concept. For example, the technical solutions formed by the mutual replacement of the above features and the technical features disclosed in the present application (but not limited to) with similar functions.

Claims

1. An apparatus for attenuating pressure pulsations in a post- compression line, the apparatus comprising: The energy-absorbing assembly, the first pressure sensor (1) and the controller, The energy-absorbing assembly comprises a balance cavity (2), a balance block (3), a branch pipe (4) and a valve (5), the balance block (3) is arranged in the balance cavity (2) and is used for separating the balance cavity (2) into an upper cavity and a lower cavity, the upper cavity is communicated with a post-compression pipeline, the lower cavity is communicated with the post-compression pipeline through the branch pipe (4), and the valve (5) is arranged on the branch pipe (4), The first pressure sensor (1) is used for detecting the pressure of the post-compression pipeline, The controller is in communication connection with the first pressure sensor (1) and the valve (5), is used for obtaining a pressure fluctuation peak-peak value according to the pressure, and controls the valve (5) to be closed when the pressure fluctuation peak-peak value exceeds a preset pressure fluctuation peak-peak value, so that the energy of pressure fluctuation of the post-compression pipeline is converted into kinetic energy of the balance block (3).

2. The device for attenuating post-charging line pressure pulsations according to claim 1, characterized in that, The energy-absorbing assembly further comprises a spring-damping shock absorber (6), and the spring-damping shock absorber (6) is connected with the balance block (3).

3. The device for attenuating post-charging line pressure pulsations according to claim 2, characterized in that, The spring-damping shock absorber (6) is installed in the lower cavity through a hole plate (7).

4. The device for attenuating post-charging line pressure pulsations of claim 1, wherein, Further comprising a second pressure sensor (8) for detecting the lower cavity pressure of the lower cavity, the second pressure sensor (8) is in communication connection with the controller, The controller can also be used for obtaining a second average pressure of the lower cavity according to the lower cavity pressure and obtaining a first average pressure of the upper cavity according to the pressure of the post-compression pipeline, and controls the valve (5) to be kept closed when the pressure difference between the second average pressure and the first average pressure does not exceed a preset pressure difference.

5. The device for attenuating post-charging line pressure pulsations of claim 1, wherein, The balance cavity (2) is communicated with an expansion cavity (9) of the post-compression pipeline.

6. A method for attenuating pressure pulsations in a post- compression line, characterized by, The device for attenuating pressure fluctuation of a post-compression pipeline according to any one of claims 1-5, comprising: S1, detecting the pressure of the post-compression pipeline of the supercharger and obtaining the pressure fluctuation peak-peak value of the post-compression pipeline per unit time; S2, comparing the pressure fluctuation peak-peak value with a preset pressure fluctuation peak-peak value, and absorbing the energy of pressure fluctuation of the post-compression pipeline by the energy-absorbing assembly when the pressure fluctuation peak-peak value is greater than the preset pressure fluctuation peak-peak value.

7. The method for attenuating post-charging line pressure pulsations of claim 6, wherein, In the S2, the energy-absorbing assembly comprises a balance cavity (2), a balance block (3), a branch pipe (4) and a valve (5), the balance block (3) is arranged in the balance cavity (2) and is used for separating the balance cavity (2) into an upper cavity and a lower cavity, the upper cavity is communicated with a post-compression pipeline, the lower cavity is communicated with the post-compression pipeline through the branch pipe (4), and the valve (5) is arranged on the branch pipe (4), In the S2, the energy-absorbing assembly absorbs the energy of pressure fluctuation of the post-compression pipeline by closing the valve (5), so that the balance block (3) moves up and down under the action of the pressure difference between the gas pressures of the upper cavity and the lower cavity, and the energy of pressure fluctuation of the post-compression pipeline is converted into kinetic energy of the balance block (3).

8. The method for attenuating post-charging line pressure pulsations of claim 7, wherein, Further comprising S3, acquiring a first average pressure of the post-compression pipeline and a second average pressure of a lower cavity of the energy absorption assembly in a unit time, and comparing the first average pressure and the second average pressure, when a pressure difference between the second average pressure and the first average pressure is less than a preset pressure difference, controlling the valve (5) to remain closed, when the pressure difference between the second average pressure and the first average pressure is greater than the preset pressure difference, controlling the valve (5) to open, and repeating S1 and S2.

9. The method for attenuating post-charging line pressure pulsations of claim 6, wherein, Further comprising S4, according to the post-compression pipeline pressure, acquiring a rotating speed of the supercharger, and triggering an overload warning when the rotating speed of the supercharger exceeds a rated rotating speed.

10. The method for attenuating post-charging line pressure pulsations of claim 9, wherein, In the S4, according to the post-compression pipeline pressure, acquiring a rotating speed of the supercharger specifically comprises, according to the post-compression pipeline pressure, acquiring a frequency spectrum of the post-compression pipeline pressure; dividing the frequency spectrum into a plurality of frequency segments, and acquiring an effective value of each frequency segment; normalizing a plurality of effective values, extracting a peak frequency of a frequency segment with the largest contrast, and calculating a rotating speed of the supercharger according to the peak frequency.

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