Device and method for attenuating post-pressure pipeline pressure pulsation

Abstract

The invention discloses a device and method for attenuating pressure pulsation of a pipeline after pressure, the device for attenuating the pressure pulsation of the pipeline after pressure comprises an energy absorption assembly, a first pressure sensor and a controller, the energy absorption 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 body and a lower cavity body, and the first pressure sensor is arranged in the upper cavity body; the upper cavity is communicated with a post-pressing pipeline, the lower cavity is communicated with the post-pressing pipeline through a branch pipe, and a valve is arranged on the branch pipe. The first pressure sensor collects the pressure of the post-pressing pipeline, the controller obtains a pressure pulsation peak-to-peak value according to the obtained pressure of the post-pressing pipeline and compares the pressure pulsation peak-to-peak value with a preset pressure pulsation peak-to-peak value, when the pressure pulsation peak-to-peak value is larger than the preset pressure pulsation peak-to-peak value, the valve is closed, and communication between the lower cavity and the post-pressing pipeline is cut off. The balance block moves under the action of the pressure difference between the upper cavity and the lower cavity, energy of pressure fluctuation of the pressed pipeline is converted into kinetic energy and heat energy of the balance block, and the impact of the pressure fluctuation on the pressed pipeline and the air filter is reduced.

Description

Technical Field

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

[0002] The operating conditions of diesel engines used in generator sets are stable, and traditional mechanical pump diesel engines can meet the demand. Compared with electronically controlled fuel pumps, they are cheaper, so mechanical pump diesel engines still have a certain share in the market.

[0003] The supercharged non-intercooled diesel engine pre-compresses the air entering the cylinder of the mechanical pump diesel engine through the air compressor, and then supplies it to the intake pipe of the cylinder through the post-compression pipeline. Since the post-compression pipeline between the air compressor and the cylinder is short, the pressure fluctuation of the post-compression pipeline is large, which impacts the post-compression pipeline and the air filter to produce abnormal noise.

[0004] Therefore, how to reduce the abnormal noise of the post-compression pipeline and the air filter has become a technical problem that needs to be solved urgently by technical personnel in this field. Summary of the invention

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

[0006] In order to achieve the above-mentioned object, the present application provides a device for attenuating pressure pulsation of a post-compression pipeline, characterized in that it includes an energy absorbing component, a first pressure sensor and a controller. The energy absorption component includes a balance chamber, a balance block, a branch pipe and a valve. The balance block is arranged in the balance chamber to separate the balance chamber into an upper chamber and a lower chamber. The upper chamber is connected to the post-compression pipeline. The lower chamber is connected to the post-compression pipeline through a branch pipe. The valve is arranged on the branch pipe. The first pressure sensor is used to detect the pressure of the post-pressurization pipeline. The controller is communicatively connected with the first pressure sensor and the valve, and is used for obtaining the peak-to-peak value of the pressure pulsation according to the pressure, and controlling the valve to close when the peak-to-peak value of the pressure pulsation exceeds a preset peak-to-peak value of the pressure pulsation, so as to convert the energy of the pressure fluctuation of the post-compression pipeline into the kinetic energy of the balance block.

[0007] Preferably, in the above-mentioned device for attenuating post-compression pipeline pressure pulsation, the energy absorbing assembly further comprises a spring damping shock absorber, and the spring damping shock absorber is connected to the balancing block.

[0008] Preferably, in the above-mentioned device for attenuating pressure pulsation in a post-compression pipeline, the spring damping shock absorber is installed in the lower cavity through an orifice plate.

[0009] Preferably, in the above-mentioned device for attenuating pressure pulsation of the post-compression pipeline, a second pressure sensor for detecting the lower cavity pressure of the lower cavity is further included, and the second pressure sensor is communicatively connected with the controller. The controller can also be used to obtain a second average pressure of the lower cavity according to the pressure of the lower cavity, and to obtain a first average pressure of the upper cavity according to the post-compression pipeline pressure, and to control the valve to remain closed when the pressure difference between the second average pressure and the first average pressure does not exceed a preset pressure difference.

[0010] Preferably, in the above-mentioned device for attenuating pressure pulsation in the post-compression pipeline, the balancing chamber is connected to the diffusion chamber of the post-compression pipeline.

[0011] A method for attenuating pressure pulsation in a compressed pipeline, applicable to the device for attenuating pressure pulsation in a compressed pipeline recorded in any one of the above schemes, comprising: S1, detecting the pressure of the post-compression pipeline of the supercharger, and obtaining the peak-to-peak value of the pressure pulsation of the post-compression pipeline per unit time; S2, comparing the pressure pulsation peak-to-peak value with a preset pressure pulsation peak-to-peak value, and when the pressure pulsation peak-to-peak value is greater than the preset pressure pulsation peak-to-peak value, the energy absorbing component absorbs the energy of the pressure fluctuation of the post-compression pipeline.

[0012] Preferably, in the above method for attenuating pressure pulsation of a post-compression pipeline, in S2, the energy absorbing component comprises a balancing chamber, a balancing block, a branch pipe and a valve, the balancing block is arranged in the balancing chamber, and is used to separate the balancing chamber into an upper chamber and a lower chamber, the upper chamber is communicated with the post-compression pipeline, the lower chamber is communicated with the post-compression pipeline through a branch pipe, and the valve is arranged on the branch pipe. The energy absorbing component in S2 absorbs the energy of the pressure fluctuation of the post-compression pipeline by closing the valve so that the balance block moves up and down under the action of the pressure difference between the gas pressure of the upper cavity and the gas pressure of the lower cavity, thereby converting the energy of the pressure fluctuation of the post-compression pipeline into the kinetic energy of the balance block.

[0013] Preferably, in the above method for attenuating post-compression pipeline pressure pulsation, it further comprises S3: Obtaining a first average pressure of the post-compression pipeline and a second average pressure of the lower cavity of the energy absorbing component within a unit time, and comparing the first average pressure with the second average pressure, When the pressure difference between the second average pressure and the first average pressure is less than the preset pressure difference, the valve is controlled to remain closed; when the pressure difference between the second average pressure and the first average pressure is greater than or equal to the preset pressure difference, the valve is controlled to open, and S1 and S2 are repeated.

[0014] Preferably, in the above method for attenuating post-compression pipeline pressure pulsation, it further comprises S4: The rotation speed of the supercharger is obtained according to the post-compression pipeline pressure, and when the rotation speed of the supercharger exceeds the calibrated rotation speed, an overload warning is triggered.

[0015] Preferably, in the above method for attenuating post-compression pipeline pressure pulsation, the speed of the supercharger is obtained according to the post-compression pipeline pressure in S4, specifically, Acquiring a frequency spectrum of the pressure of the post-compression pipeline according to the pressure of the post-compression pipeline; Dividing the spectrum into multiple frequency segments and obtaining the effective value of each frequency segment; A normalization process is performed on the multiple effective values, a peak frequency in a frequency band with the largest contrast is extracted, and the rotation speed of the supercharger is calculated according to the peak frequency.

[0016] The device for attenuating the pressure pulsation of the post-compression pipeline provided in the embodiment of the present application includes an energy absorbing component, a first pressure sensor and a controller. The energy absorbing component includes a balancing chamber, a balancing block, a branch pipe and a valve. The balancing block is arranged in the balancing chamber. The balancing block divides the balancing chamber into an upper cavity and a lower cavity. The upper cavity is connected to the post-compression pipeline. The lower cavity is connected to the post-compression pipeline through a branch pipe. A valve is arranged on the branch pipe. The valve is used to control the connection between the post-compression pipeline and the lower cavity. The first pressure sensor collects the pressure of the post-compression pipeline in real time and feeds back the pressure to the controller. The controller The peak-to-peak value of the pressure pulsation in the post-compression pipeline is obtained according to the pressure collected by the first pressure sensor and compared with the preset peak-to-peak value of the pressure pulsation. When the peak-to-peak value of the pressure pulsation is greater than the preset peak-to-peak value of the pressure pulsation, the valve is controlled to close, cutting off the connection between the lower cavity and the post-compression pipeline. The lower cavity forms a closed cavity, and the balancing block moves under the action of the pressure difference between the upper cavity and the lower cavity, converting the energy of the pressure fluctuation in the post-compression pipeline into kinetic energy and thermal energy of the balancing block, so as to reduce the impact of the pressure fluctuation on the post-compression pipeline and the air filter, thereby reducing the abnormal noise of the post-compression pipeline and the air filter.

[0017] Some embodiments of the present application disclose a method for attenuating pressure pulsation in a post-compression pipeline, which is applicable to the above-mentioned device for attenuating pressure pulsation in a post-compression pipeline. Since the device for attenuating pressure pulsation in a post-compression pipeline has the above-mentioned technical effects, the method for attenuating pressure pulsation in a post-compression pipeline applicable to the device also has the same technical effects, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without creative work, 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 explained, the same reference numerals in the figures represent the same structure or operation.

[0019] Figure 1 It is a structural schematic diagram of an energy absorbing component of a device for attenuating pressure pulsation of a post-compression pipeline disclosed in the present application; Figure 2 It is a front view of the energy absorbing component of the device for attenuating the pressure pulsation of the post-compression pipeline disclosed in the present application; Figure 3 It is a normalized histogram; Figure 4 is the spectrum graph; Figure 5 The present application discloses a flow chart of a method for attenuating pressure pulsation in a post-compression pipeline.

[0020] The accompanying drawings are as follows: 1-first pressure sensor; 2-balance chamber; 3-balance block; 4-branch pipe; 5-valve; 6-spring damping shock absorber; 7-orifice plate; 8-second pressure sensor; 9-diffusion chamber. DETAILED DESCRIPTION

[0021] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It will be understood that the specific embodiments described herein are only used to explain the related application, rather than to limit the application. The described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0022] It should be noted that, for ease of description, only the parts related to the relevant applications are shown in the accompanying drawings. In the absence of conflict, the embodiments in this application and the features in the embodiments can be arbitrarily combined with each other, as long as the combined technical features are not contradictory. All feasible feature combinations are technical contents clearly recorded in this article. Any of the multiple sub-features contained in the same sentence can be applied independently, and does not have to be applied together with other sub-features.

[0023] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0024] In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0025] See also Figure 1-Figure 5 .

[0026] The present invention discloses a device for attenuating pressure pulsation of a post-compression pipeline, comprising an energy absorbing component, a first pressure sensor 1 and a controller, wherein: The energy absorption component includes a balance chamber 2, a balance block 3, a branch pipe 4 and a valve 5. The balance block 3 is arranged in the balance chamber 2. The balance block 3 divides the balance chamber 2 into an upper chamber and a lower chamber. The upper chamber is connected to the post-compression pipeline. The lower chamber is connected to the post-compression pipeline through the branch pipe 4. The branch pipe 4 is provided with a valve 5. The valve 5 is used to control the connection between the post-compression pipeline and the lower chamber. The first pressure sensor 1 is used to detect the pressure of the post-compression pipeline. The upper cavity is connected to the post-compression pipeline. The first pressure sensor 1 can be arranged on the post-compression pipeline or in the upper cavity. The controller is communicatively connected with the first pressure sensor 1 and the valve 5, and is used for obtaining the peak-to-peak value of the pressure pulsation of the upper cavity according to the pressure, and when the peak-to-peak value of the pressure pulsation exceeds the preset peak-to-peak value of the pressure pulsation, controlling the valve 5 to close, cutting off the connection between the lower cavity and the post-compression pipeline, so that the lower cavity forms a closed cavity, and the balancing block 3 moves under the action of the pressure difference between the upper cavity and the lower cavity, converting the energy of the pressure fluctuation of the post-compression pipeline into the kinetic energy and thermal energy of the balancing block 3.

[0027] When the peak-to-peak value of the pressure pulsation is less than the preset peak-to-peak value of the pressure pulsation, the valve 5 remains open, the lower cavity is connected to the post-compression pipeline, the pressure of the upper cavity is equal to the pressure of the lower cavity, both are the pressure of the post-compression pipeline, and the balance block 3 does not move.

[0028] The present scheme discloses a device for attenuating pressure pulsation in a post-compression pipeline. A first pressure sensor 1 collects the pressure of the post-compression pipeline in real time and feeds the pressure back to a controller. The controller obtains the peak-to-peak value of the pressure pulsation in the post-compression pipeline according to the pressure collected by the first pressure sensor 1, and compares it with a preset peak-to-peak value of the pressure pulsation. When the peak-to-peak value of the pressure pulsation is greater than the preset peak-to-peak value of the pressure pulsation, the controller controls the energy-absorbing component to absorb the energy of the pressure fluctuation in the post-compression pipeline, so as to reduce the impact of the pressure fluctuation on the post-compression pipeline and the air filter, thereby reducing the abnormal noise of the post-compression pipeline and the air filter.

[0029] Specifically, when the pressure in the upper cavity is greater than that in the lower cavity, the balance weight 3 moves toward the lower cavity under the action of the pressure difference between the upper cavity and the lower cavity; when the pressure in the upper cavity is less than that in the lower cavity, the balance weight 3 moves toward the upper cavity under the action of the pressure difference between the upper cavity and the lower cavity.

[0030] The device for attenuating the pressure pulsation of the post-compression pipeline disclosed in the present scheme automatically controls the energy absorbing component to absorb the energy of the pressure fluctuation of the post-compression pipeline, and has high reliability in reducing the abnormal noise of the post-compression pipeline and the air filter.

[0031] In some embodiments, the first pressure sensor 1 is a high-frequency pressure sensor. The high-frequency pressure sensor is made by utilizing the extremely high Young's modulus of elasticity and excellent mechanical properties of semiconductor silicon, so that the sensor has the advantages of high natural frequency, high dynamic frequency response, wide range coverage, good product stability, and small size.

[0032] like Figure 1 and Figure 2 As shown, the first end of the balancing chamber 2 is an open end, the open end of the balancing chamber 2 is connected to the post-compression pipeline, and the second end of the balancing chamber 2 is a closed end, and the pressure fluctuation of the post-compression pipeline is transmitted into the balancing chamber 2 through the open end of the balancing chamber 2; The balancing block 3 is sealed and connected to the balancing chamber 2. The upper chamber and the lower chamber are not connected. The upper chamber is connected to the post-compression pipeline through an open end, and the lower chamber is connected to the post-compression pipeline through a branch pipe 4. In some embodiments, a sealing ring is provided around the balancing block 3 to achieve a sealed connection between the balancing block 3 and the balancing chamber 2. A valve 5 is provided on the branch pipe 4. When the valve 5 is opened, the lower cavity is connected with the post-compression pipeline. When the valve 5 is closed, the lower cavity is not connected with the post-compression pipeline.

[0033] In some embodiments, the preset peak-to-peak value of the pressure pulsation is 20 kPa. When the peak-to-peak value of the pressure pulsation exceeds 20 kPa, the valve 5 is closed. When the peak-to-peak value of the pressure pulsation does not exceed 20 kPa, the valve 5 remains open.

[0034] Optionally, the valve 5 is a butterfly valve.

[0035] In some embodiments, the energy absorbing assembly further includes a spring damping shock absorber 6, which is connected to the balancing weight 3. When the pressure of the upper cavity is greater than the pressure of the lower cavity, the balancing weight 3 moves toward 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 of the upper cavity is less than the pressure of the lower cavity, the balancing weight 3 moves toward 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.

[0036] In an embodiment in which the energy absorbing component has a balancing block 3 and a spring damping shock absorber 6, the pressure fluctuation of the post-compression pipeline is converted into the mechanical movement of the balancing block 3, the elastic potential energy of the spring damping shock absorber 6, and the heat energy generated by the friction between the balancing block 3 and the balancing chamber 2. The energy of the pressure fluctuation is dissipated in the form of the elastic potential energy of the spring damping shock absorber 6, the mechanical energy of the balancing block 3, and the heat energy of the friction between the balancing block 3 and the balancing chamber 2, thereby attenuating the pressure fluctuation.

[0037] The controller processes the pressure detected by the first pressure sensor 1 to obtain the peak-to-peak value of the pressure pulsation, and controls the opening and closing of the valve 5 according to the comparison result of the peak-to-peak value of the pressure pulsation with the preset peak-to-peak value of the pressure pulsation, thereby realizing the automated operation of the device for attenuating the pressure pulsation of the post-compression pipeline, with simple and flexible operation.

[0038] In some embodiments, the device for attenuating post-compression pipeline pressure pulsation disclosed in the present solution further includes a second pressure sensor 8 for detecting the pressure of the lower cavity, and the second pressure sensor 8 is communicatively connected with the controller; The controller can also be used to obtain a second average pressure of the lower cavity and a first average pressure of the post-compression pipeline according to the pressure of the lower cavity, and compare the second average pressure with 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; When the pressure difference between the second average pressure and the first average pressure is less than the preset pressure difference, the control valve 5 is opened, and the pressure of the post-compression 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-compression pipeline, and then compares it to determine whether the valve 5 is closed.

[0039] In some embodiments, when the peak-to-peak value P2P_RT1 of the pressure pulsation in the post-compression pipeline exceeds 20 kPa, the valve 5 is closed; the second pressure sensor 8 detects the pressure of the lower cavity, and calculates the second average pressure Aver_RT2 of the lower cavity. If the difference Δ between the second average pressure Aver_RT2 and the first average pressure Aver_RT1 of the post-compression pipeline is P2P_RT1*0.3, the valve 5 remains closed. If the above conditions are not met, the valve 5 is opened, and the above process of obtaining the peak-to-peak value of the pressure pulsation in the post-compression pipeline is repeated, and compared with the preset peak-to-peak value of the pressure pulsation to determine whether the valve 5 is closed.

[0040] In some embodiments, the spring damping shock absorber 6 is installed in the lower cavity through a perforated plate 7, and the perforated plate 7 is located below the balancing block 3. The position of the spring damping shock absorber 6 in the lower cavity is fixed to ensure that only the spring of the spring damping shock absorber 6 is compressed when the balancing block 3 moves.

[0041] The balance chamber 2 is communicated with the diffusion chamber 9 of the post-compression pipeline.

[0042] The controller can also obtain the speed of the supercharger according to the pressure of the post-compression pipeline, and then judge the engine load according to the speed of the supercharger. When the speed of the supercharger exceeds the rated speed, the engine is judged to be overloaded and an early warning is issued; when the speed of the supercharger does not exceed the rated speed, the engine will not be overloaded. It should be noted here that the rated speed is the actual working speed of the supercharger under rated / overload steady-state conditions.

[0043] Specifically, the pressure of the post-compression pipeline is detected by the first pressure sensor 1, and the controller obtains the frequency spectrum of the post-compression pipeline according to the post-compression pipeline; Divide the frequency into multiple frequency segments and obtain the effective value of each frequency segment; A plurality of effective values ​​are normalized, a peak frequency in a frequency band with the largest contrast is extracted, and the speed of the supercharger is calculated based on the peak frequency.

[0044] 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 ), where x1 2 , x2 2 , x3 2 ,……,x n-1 2 and x n 2 is the amplitude at different frequencies in the spectrum; Using linear normalization (XX 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.

[0045] 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 N values ​​exceeding the first preset value (0.6 is selected in some embodiments, and 0.6 is an experimental experience value and is manually set) is less than or equal to n (2 is selected in some embodiments), it is considered that the speed of the supercharger does not exceed the calibrated speed. When n=1, the middle frequency of the frequency segment exceeding the first preset value is selected to calculate the speed of the supercharger. When n=2, and the pressure peak is located between the two frequency segments, the normalized values ​​of the 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 speed of the supercharger; if the number of numbers exceeding 0.6 in the N numbers exceeds n, it is considered that the speed of the supercharger exceeds the calibrated speed.

[0046] like Figure 3 and Figure 4 As shown in the figure, 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 result is shown in the bar chart. The frequency 1 in the bar chart 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 normalized data of the seventh group of data 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 after normalization is located. The peak frequency in the frequency segment of the seventh group of data is used to calculate the supercharger speed.

[0047] The device for attenuating the pressure pulsation of the post-compression pipeline disclosed in this solution can be adjusted in real time according to the different pressures of the post-compression pipeline, and the pressure pulsation can be attenuated under different loads. Some embodiments of the present application disclose a method for attenuating the pressure pulsation of the post-compression pipeline, which is applicable to the above-mentioned device for attenuating the pressure pulsation of the post-compression pipeline, including: S1, detecting the pressure of the post-compression pipeline of the supercharger and obtaining the peak-to-peak value of the pressure pulsation of the post-compression pipeline per unit time; S2, comparing the peak-to-peak value of the pressure pulsation with the preset peak-to-peak value of the pressure pulsation, and when the peak-to-peak value of the pressure pulsation is greater than the preset peak-to-peak value of the pressure pulsation, the energy absorbing component absorbs the energy of the pressure fluctuation of the post-pressure pipeline.

[0048] When the peak-to-peak value of the pressure pulsation is less than the preset peak-to-peak value of the pressure pulsation, there is a small abnormal noise in the pipeline after compression, which does not need to be reduced. When the peak-to-peak value of the pressure pulsation is greater than the preset peak-to-peak value of the pressure pulsation, there is a large abnormal noise in the pipeline after compression, which needs to be reduced.

[0049] The method for attenuating the pressure pulsation of the post-compression pipeline disclosed in the present scheme first detects the pressure of the post-compression pipeline of the supercharger to obtain the pressure change curve of the post-compression pipeline, and obtains the peak-to-peak value of the pressure pulsation according to the detected pressure of the post-compression pipeline, and then compares the obtained peak-to-peak value of the pressure pulsation with the preset peak-to-peak value of the pressure pulsation, so that when the peak-to-peak value of the pressure pulsation exceeds the preset peak-to-peak value of the pressure pulsation, the energy of the pressure fluctuation is absorbed by the energy-absorbing component, and the energy of the pressure fluctuation is converted into mechanical energy, so as to reduce the impact of the pressure fluctuation on the post-compression pipeline and the air filter, and then reduce the abnormal noise of the post-compression pipeline and the air filter.

[0050] Specifically, the pressure sensor 1 detects the pressure of the post-compression pipeline of the supercharger, and converts the pressure into a pressure signal and transmits it to the controller, which processes the pressure signal to obtain the peak-to-peak value of the pressure pulsation. The peak-to-peak value of the pressure pulsation refers to the difference between the maximum value and the minimum value of the pressure pulsation signal within a certain period of time.

[0051] The first pressure sensor 1 is a high-frequency pressure sensor, which is made by utilizing the extremely high Young's modulus and excellent mechanical properties of semiconductor silicon, so that the sensor has the advantages of high natural frequency, high dynamic frequency response, wide range coverage, good product stability, and small size.

[0052] In this scheme S2, the energy absorbing component includes a balancing chamber 2, a balancing block 3, a branch pipe 4 and a valve 5. The balancing block 3 is arranged in the balancing chamber 2 to separate the balancing chamber 2 into an upper chamber and a lower chamber. The upper chamber is connected to the post-compression pipeline, and the lower chamber is connected to the post-compression pipeline through the branch pipe 4. The valve 5 is arranged on the branch pipe 4. The energy absorbing component in S2 absorbs the energy of the pressure fluctuation of the post-compression pipeline by closing the valve 5, so that the balance block 3 moves up and down under the pressure difference of the gas pressure in the upper cavity and the lower cavity, and converts the energy of the pressure fluctuation of the post-compression pipeline into the kinetic energy of the balance block 3.

[0053] The controller is communicatively connected with the first pressure sensor 1 and the valve 5, and is used for obtaining the peak-to-peak value of the pressure pulsation of the upper cavity according to the pressure, and when the peak-to-peak value of the pressure pulsation exceeds the preset peak-to-peak value of the pressure pulsation, controlling the valve 5 to close, cutting off the connection between the lower cavity and the post-compression pipeline, so that the lower cavity forms a closed cavity, and the balancing block 3 moves under the action of the pressure difference between the upper cavity and the lower cavity, converting the energy of the pressure fluctuation of the post-compression pipeline into the kinetic energy and thermal energy of the balancing block 3.

[0054] When the peak-to-peak value of the pressure pulsation is less than the preset peak-to-peak value of the pressure pulsation, the valve 5 remains open, the lower cavity is connected to the post-compression pipeline, the pressure of the upper cavity is equal to the pressure of the lower cavity, both are the pressure of the post-compression pipeline, and the balance block 3 does not move.

[0055] The present scheme discloses a device for attenuating pressure pulsation in a post-compression pipeline. A first pressure sensor 1 collects the pressure of the post-compression pipeline in real time and feeds the pressure back to a controller. The controller obtains the peak-to-peak value of the pressure pulsation in the post-compression pipeline according to the pressure collected by the first pressure sensor 1, and compares it with a preset peak-to-peak value of the pressure pulsation. When the peak-to-peak value of the pressure pulsation is greater than the preset peak-to-peak value of the pressure pulsation, the controller controls the energy-absorbing component to absorb the energy of the pressure fluctuation in the post-compression pipeline, so as to reduce the impact of the pressure fluctuation on the post-compression pipeline and the air filter, thereby reducing the abnormal noise of the post-compression pipeline and the air filter.

[0056] Specifically, when the pressure in the upper cavity is greater than that in the lower cavity, the balance weight 3 moves toward the lower cavity under the action of the pressure difference between the upper cavity and the lower cavity; when the pressure in the upper cavity, i.e., the post-compression pipeline, is less than the pressure in the lower cavity, the balance weight 3 moves toward the upper cavity under the action of the pressure difference between the upper cavity and the lower cavity.

[0057] This solution converts the pressure fluctuation of the post-compression pipeline into the mechanical movement of the balancing block 3 and the heat energy generated by the friction between the balancing block 3 and the balancing chamber 2, and dissipates the energy of the pressure fluctuation in the form of mechanical energy of the balancing block 3 and the heat energy of the friction between the balancing block 3 and the balancing chamber 2, thereby attenuating the pressure fluctuation.

[0058] The method for attenuating post-compression pipeline pressure pulsation disclosed in the present solution further includes S3, Obtain the first average pressure of the pipeline after compression per unit time and the second average pressure of the lower cavity of the energy absorbing component, and compare the first average pressure with the second average pressure. When the pressure difference between the second average pressure and the first average pressure is less than the preset pressure difference, the control valve 5 remains closed; when the pressure difference between the second average pressure and the first average pressure is greater than or equal to the preset pressure difference, the control valve 5 opens, and S1 and S2 are repeated.

[0059] In some embodiments, when the peak-to-peak value P2P_RT1 of the pressure pulsation in the post-compression pipeline exceeds 20 kPa, the valve 5 is closed; the second pressure sensor 8 detects the pressure of the lower cavity, and calculates the second average pressure Aver_RT2 of the lower cavity. If the difference Δ between the second average pressure Aver_RT2 and the first average pressure Aver_RT1 of the post-compression pipeline is P2P_RT1*0.3, the valve 5 remains closed. If the above conditions are not met, the valve 5 is opened, and the above process of obtaining the peak-to-peak value of the pressure pulsation in the post-compression pipeline is repeated, and compared with the preset peak-to-peak value of the pressure pulsation to determine whether the valve 5 is open.

[0060] The method for attenuating post-compression pipeline pressure pulsation disclosed in the present solution further includes S4, The speed of the supercharger is obtained according to the post-compression pipeline pressure, and when the speed of the supercharger exceeds the calibrated speed, an overload warning is triggered.

[0061] S4 specifically comprises obtaining a frequency spectrum of the pressure of the post-compression pipeline according to the pressure of the post-compression pipeline; Divide the spectrum into multiple frequency segments and obtain the effective value of each frequency segment; A plurality of effective values ​​are normalized, a peak frequency in a frequency band with the largest contrast is extracted, and the speed of the supercharger is calculated based on the peak frequency.

[0062] 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 ), where x1 2 , x2 2 , x3 2 ,……,x n-1 2 and x n 2 is the amplitude at different frequencies in the spectrum; Using linear normalization (XX 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.

[0063] 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 N values ​​exceeding the first preset value (0.6 is selected in some embodiments, and 0.6 is an experimental experience value and is manually set) is less than or equal to n (2 is selected in some embodiments), it is considered that the speed of the supercharger does not exceed the calibrated speed. When n=1, the middle frequency of the frequency segment exceeding the first preset value is selected to calculate the speed of the supercharger. When n=2, and the pressure peak is located between the two frequency segments, the normalized values ​​of the 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 speed of the supercharger; if the number of numbers exceeding 0.6 in the N numbers exceeds n, it is considered that the speed of the supercharger is normal and no warning is issued.

[0064] like Figure 3 and Figure 4 As shown in the figure, 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 result is shown in the bar chart. The frequency 1 in the bar chart 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 normalized data of the seventh group of data 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 after normalization is located. The supercharger speed is calculated based on the center frequency of the seventh group (15250Hz).

[0065] The overload warning is only used to record and prompt the engine status. It does not affect the control of the energy absorption component or the operation of the engine.

[0066] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used, and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. The scope of application involved in the present application is not limited to the technical solution formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned application concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in this application (but not limited to) to form a technical solution.

Claims

1. A device for attenuating pressure pulsation in a compressed pipeline, characterized in that: It comprises an energy absorbing component, a first pressure sensor (1) and a controller, The energy absorbing assembly comprises a balancing chamber (2), a balancing block (3), a branch pipe (4) and a valve (5); the balancing block (3) is arranged in the balancing chamber (2) and is used to separate the balancing chamber (2) into an upper chamber and a lower chamber; the upper chamber is connected to a post-compression pipeline; the lower chamber is connected to the post-compression pipeline via a branch pipe (4); the valve (5) is arranged on the branch pipe (4); The first pressure sensor (1) is used to detect the pressure of the post-pressurization pipeline. The controller is in communication with the first pressure sensor (1) and the valve (5) and is used to obtain a peak-to-peak value of pressure pulsation according to the pressure, and when the peak-to-peak value of pressure pulsation exceeds a preset peak-to-peak value of pressure pulsation, control the valve (5) to close, so as to convert the energy of the pressure fluctuation of the post-pressure pipeline into the kinetic energy of the balance block (3).

2. The device for attenuating pressure pulsation in a post-compression pipeline according to claim 1, characterized in that: The energy absorbing assembly further comprises a spring damping shock absorber (6), wherein the spring damping shock absorber (6) is connected to the balancing block (3).

3. The device for attenuating pressure pulsation of a compressed pipeline according to claim 2, characterized in that: The spring damping shock absorber (6) is installed in the lower cavity through a perforated plate (7).

4. The device for attenuating pressure pulsation of a compressed pipeline according to claim 1, characterized in that: It also includes a second pressure sensor (8) for detecting the pressure of the lower cavity of the lower cavity, wherein the second pressure sensor (8) is in communication connection with the controller. The controller can also be used to obtain a second average pressure of the lower chamber according to the pressure of the lower chamber, and to obtain a first average pressure of the upper chamber according to the pressure of the post-compression pipeline, and 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.

5. The device for attenuating pressure pulsation in a compressed pipeline according to claim 1, characterized in that: The balancing chamber (2) is in communication with the pressure diffusion chamber (9) of the post-compression pipeline.

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

7. The method for attenuating post-compression pipeline pressure pulsation according to claim 6, characterized in that: In S2, the energy absorbing component comprises a balancing chamber (2), a balancing block (3), a branch pipe (4) and a valve (5); the balancing block (3) is arranged in the balancing chamber (2) and is used to separate the balancing chamber (2) into an upper chamber and a lower chamber; the upper chamber is connected to a post-compression pipeline; the lower chamber is connected to the post-compression pipeline via a branch pipe (4); the valve (5) is arranged on the branch pipe (4); The energy absorbing component in S2 absorbs the energy of the 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 pressure of the upper cavity and the gas pressure of the lower cavity, thereby converting the energy of the pressure fluctuation of the post-compression pipeline into the kinetic energy of the balance block (3).

8. The method for attenuating post-compression pipeline pressure pulsation according to claim 7, characterized in that: Also includes S3, Obtaining a first average pressure of the post-compression pipeline and a second average pressure of the lower cavity of the energy absorbing component within a unit time, and comparing the first average pressure with the second average pressure, When the pressure difference between the second average pressure and the first average pressure is less than a preset pressure difference, the valve (5) is controlled to remain closed; when the pressure difference between the second average pressure and the first average pressure is greater than or equal to the preset pressure difference, the valve (5) is controlled to open, and steps S1 and S2 are repeated.

9. The method for attenuating post-compression pipeline pressure pulsation according to claim 6, characterized in that: Also includes S4, The rotation speed of the supercharger is obtained according to the post-compression pipeline pressure, and when the rotation speed of the supercharger exceeds the calibrated rotation speed, an overload warning is triggered.

10. The method for attenuating post-compression pipeline pressure pulsation according to claim 9, characterized in that: In S4, the speed of the supercharger is obtained according to the post-compression pipeline pressure, specifically, Acquiring a frequency spectrum of the pressure of the post-compression pipeline according to the pressure of the post-compression pipeline; Dividing the spectrum into multiple frequency segments and obtaining the effective value of each frequency segment; A normalization process is performed on the multiple effective values, a peak frequency of a frequency segment with the largest contrast is extracted, and the rotation speed of the supercharger is calculated according to the peak frequency.

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