A method for reducing the knocking noise of a vibration damping decoupler in a vehicle
By building the target model and adjusting the parameters of the vibration-absorbing decoupler, the problem of knocking abnormal noise of the vibration-absorbing decoupler under vehicle starting or small throttle operation is solved, and a shorter development cycle and lower experimental costs are achieved. Improves the accuracy and efficiency of system matching.
Patent Information
- Application Number
- CN202111328114.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-11-10
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2041-11-10
AI Technical Summary
Existing vibration-absorbing decouplers have abnormal knocking noise problems when vehicle starts or small throttle conditions, resulting in long development cycles, high experimental costs and high matching difficulties.
Build a target model, input fixed parameters and load parameters under preset operating conditions in real time, calculate the impact of the vibration damping decoupler at different time points, judge whether the peak time points are consistent, and adjust the vibration damping decoupler parameters according to the results To reduce the impact of the knock, simplify the system into a one-dimensional plane and a torsional system to quickly evaluate transient conditions.
Through simulation methods, reduce the knocking noise of the vibration-absorbing decoupler under starting or small throttle conditions, shorten the development cycle, reduce experimental costs, and improve the accuracy and efficiency of system matching.
Smart Images
Figure CN114398713B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of vehicle simulation, in particular to a method for reducing the abnormal knocking noise of a vibration-damping decoupler in a vehicle. Background Art
[0002] At present, in order to reduce vibration of the accessory system and the crankshaft system, a vibration-damping decoupler is designed inside the vehicle. The vibration-damping decoupler has a good vibration-damping effect when the vehicle is operating at high speed and with a large throttle. However, when the vehicle is in starting conditions or low throttle conditions, the vibration-damping decoupler will produce abnormal knocking noises while matching with the crankshaft system and the accessory system to achieve the vibration-damping effect. Currently, the main method used to solve the abnormal knocking noise of the vibration-damping decoupler under starting conditions or low throttle conditions is the test method. However, due to the complexity of the matching system and the changeable working conditions, this method leads to a long development cycle for the vibration-damping decoupler, high test costs, and difficulty in troubleshooting the knocking problems caused by matching between systems. Summary of the invention
[0003] An object of the first aspect of the present invention is to provide a method for reducing the knocking noise of a vibration damping decoupler in a vehicle to solve the problems of long development cycle and high experimental cost of the vibration damping decoupler in the prior art.
[0004] Another object of the first aspect of the present invention is to solve the problem of model complexity of the simulation model in the prior art.
[0005] In particular, the present invention provides a method for reducing the abnormal knocking noise of a vibration damping decoupler, which is used to reduce the abnormal knocking noise of the vibration damping decoupler after the vibration damping decoupler is matched with the accessory system and the crankshaft system of the vehicle under a preset working condition of the vehicle, wherein the preset working condition includes a low throttle working condition or a starting working condition, comprising:
[0006] Build a target model;
[0007] Inputting parameters into the target model in real time, wherein the parameters include fixed parameters and load parameters under the preset working condition, the fixed parameters include accessory system parameters, crankshaft system parameters and vibration damping decoupler parameters, and the load parameters include torque and cylinder pressure of the generator under the preset working condition;
[0008] Calculating the knocking impulse of the vibration reduction decoupler at different time points under the preset working condition according to the fixed parameters and the load parameters at different time points;
[0009] Determine whether the time point corresponding to the peak value of the multiple knocking impulses of the vibration damping decoupler under the preset working condition obtained by calculation is consistent with the time point corresponding to the peak value of the multiple knocking impulses obtained by the experiment. If they are consistent, change the parameters of the vibration damping decoupler to reduce the peak value of the knocking impulse, thereby reducing the abnormal knocking sound of the vibration damping decoupler.
[0010] Optionally, building a target model includes:
[0011] Building a standard model, wherein the standard model includes an accessory system model, a vibration damping decoupler model and a crankshaft system model;
[0012] The standard model is simplified to obtain a simplified model, wherein the accessory system model is simplified to obtain a one-dimensional plane model of the accessory system, the crankshaft system model is simplified to obtain a one-dimensional torsional vibration model of the crankshaft system, and the vibration damping decoupler model is simplified to obtain a one-dimensional torsional knocking model of the vibration damping decoupler;
[0013] The target model is obtained by sequentially connecting the one-dimensional plane model of the accessory system, the one-dimensional torsional knock model of the vibration damping decoupler and the one-dimensional torsional vibration model of the crankshaft system.
[0014] Optionally, the step of inputting parameters into the target model comprises:
[0015] Collecting the fixed parameters and the corresponding load parameters under the preset working conditions;
[0016] inputting the fixed parameters into the target model;
[0017] The corresponding load parameters are input into the target model under the preset working condition.
[0018] Optionally, the step of inputting the fixed parameters into the target model comprises:
[0019] Input the accessory system parameters into the simplified model of the accessory system; wherein the accessory system parameters include the geometric position and rotating part inertia of the driving water pump, tensioner, BSG generator, and air compressor, and the belt type and size;
[0020] Inputting the crankshaft system parameters into the simplified model of the crankshaft system; wherein the crankshaft system parameters include the stiffness and inertia of the pulley, the balance shaft, the crankshaft, the dual mass flywheel, and the active end of the clutch; and
[0021] Input the vibration damping decoupler parameters into the simplified model of the vibration damping decoupler; wherein the vibration damping decoupler parameters include the stiffness, inertia and geometric limit size of the relevant components of the vibration damping decoupler.
[0022] Optionally, inputting corresponding load parameters into the target model under the preset working condition includes:
[0023] Under the starting condition, inputting the torque of the generator into the one-dimensional plane model of the accessory system in the target model, and inputting the cylinder pressure of the generator into the one-dimensional torsional vibration model of the crankshaft system; or
[0024] The cylinder pressure of the generator is input into the one-dimensional torsional vibration model of the crankshaft system under the low throttle operating condition.
[0025] Optionally, calculating the knocking impulse of the vibration damping decoupler at different times under the preset working condition according to the fixed parameter and the load parameter includes:
[0026] Calculating the spring knocking torque and the knocking speed of the vibration damping decoupler under the preset working condition according to the fixed parameter and the load parameter;
[0027] The knocking impulse is obtained by multiplying the spring knocking torque and the knocking speed.
[0028] Optionally, after multiplying the spring striking torque and the striking speed to obtain the striking impulse, the method further includes:
[0029] Draw a first curve showing the change of the knocking impulse over time, and obtain a first peak value of the knocking impulse in the first curve and its corresponding time;
[0030] Acquire and store a second curve of the knocking impulse changing with time obtained by the experiment, and obtain a second peak value of the knocking impulse in the second curve and its corresponding time;
[0031] When the time corresponding to the first peak value coincides with the time corresponding to the second peak value, the vibration reduction decoupler parameters are changed to reduce the peak value of the knocking impulse.
[0032] Optionally, the step of changing the vibration damping decoupler parameters to adjust the peak value of the knocking impulse so as to reduce the abnormal knocking sound of the vibration damping decoupler includes:
[0033] changing the vibration decoupler parameters input into the target model;
[0034] Obtaining a new third curve of the knock impulse changing with time according to the changed parameters of the vibration damping decoupler, and obtaining a third peak value of the knock impulse in the third curve;
[0035] The third peak value is compared with a preset peak value, and when the third peak value is smaller than the preset peak value, the changed vibration damping decoupler parameter is stored.
[0036] Optionally, the vibration damping decoupler includes a large spring, a small spring, a spring shell, a cover shell, a pulley and a drive plate; wherein, there are two large springs, both of which are arranged in the spring shell, and both ends are abutted by the protrusion structure in the spring shell; there are two small springs, both of which are arranged outside the spring shell, and both ends are abutted against the protrusions outside the spring shell; the vibration damping decoupler parameters include large spring parameters and small spring parameters, the large spring parameters include the stiffness, stroke, center distance and warning torque of the large spring, and the small spring parameters include the stiffness, stroke and center distance of the small spring.
[0037] The present invention builds a target model to simulate the knocking impulse of the vibration damping decoupler under a starting condition or a small throttle condition, obtains the knocking impulse by inputting parameters under the corresponding conditions, and can reduce the knocking impulse of the vibration damping decoupler under the starting condition or the small throttle condition by changing the parameters, thereby reducing the abnormal knocking noise of the vibration damping decoupler. The present invention obtains the knocking impulse of the vibration damping decoupler through a simulation method, and reduces the knocking impulse by changing the parameters of the vibration damping decoupler, thereby reducing the abnormal knocking noise of the vibration damping decoupler, thereby shortening the development cycle of the vibration damping decoupler and reducing the cost of experiments.
[0038] The present invention simplifies each system into a planar system and a one-dimensional torsion system, thereby realizing the coupling of the planar system and the torsion system, and quickly evaluating whether there is a knocking risk for the vibration reduction decoupler under transient working conditions.
[0039] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0040] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:
[0041] Figure 1 The time domain noise diagram and the corresponding time domain noise colormap diagram of the knocking noise of the vibration reduction decoupler under low throttle conditions;
[0042] Figure 2 The time domain noise diagram and the corresponding time domain noise colormap diagram of the knocking noise of the vibration reduction decoupler under the starting condition;
[0043] Figure 3 is a schematic flow chart of a method for reducing abnormal knocking noise of a vibration damping decoupler according to a specific embodiment of the present invention;
[0044] Figure 4is a schematic flow chart of steps for building a target model according to a specific embodiment of the present invention;
[0045] Figure 5 is a schematic diagram of a one-dimensional plane model of an accessory system obtained by simplifying a standard accessory system model according to a specific embodiment of the present invention;
[0046] Figure 6 is a schematic diagram of simplifying a crankshaft system model into a one-dimensional torsional vibration model of the crankshaft system according to a specific embodiment of the present invention;
[0047] Figure 7 is a schematic diagram of a one-dimensional torsional knocking model of a vibration damping decoupler obtained by simplifying a vibration damping decoupler model according to a specific embodiment of the present invention;
[0048] Figure 8 is a schematic diagram of obtaining a target model by sequentially connecting a one-dimensional plane model of an accessory system, a one-dimensional torsional knock model of a vibration damping decoupler, and a one-dimensional torsional vibration model of a crankshaft system according to a specific embodiment of the present invention;
[0049] Fig. 9 is a schematic flow chart of the steps of inputting parameters into a target model according to a specific embodiment of the present invention;
[0050] Fig.10 is a schematic flow chart of calculating the knocking impulse of the vibration damping decoupler at different times under preset working conditions according to a specific embodiment of the present invention based on fixed parameters and load parameters;
[0051] Fig.11 is a schematic flow chart of calculating the knocking impulse of the vibration damping decoupler at different times under preset working conditions according to a specific embodiment of the present invention based on fixed parameters and load parameters;
[0052] Fig.12 is a schematic diagram of a first curve of a knock impulse of a certain vehicle model obtained by using the vibration damping decoupler parameters over time according to a specific embodiment of the present invention;
[0053] Fig.13 is a schematic flow chart of the steps of changing the vibration damping decoupler parameters to adjust the peak value of the knocking impulse so as to reduce the abnormal knocking sound of the vibration damping decoupler according to a specific embodiment of the present invention;
[0054] Fig.14 It is the time domain noise colormap obtained after inputting the original parameters under the low throttle condition and changing the parameters of the vibration reduction decoupler;
[0055] Fig.15 It is the time domain noise diagram obtained after inputting the original parameters and changing the parameters of the vibration reduction decoupler under starting conditions. DETAILED DESCRIPTION
[0056] As a specific embodiment of the present invention, the method of reducing the abnormal knocking noise of the vibration damper decoupler in this embodiment is used to reduce the abnormal knocking noise of the vibration damper decoupler after it is matched with the accessory system and crankshaft system of the vehicle under preset operating conditions of the vehicle, wherein the preset operating conditions include low throttle conditions or starting conditions.
[0057] Specifically, in one embodiment, the vibration damping decoupler currently used may include a large spring, a small spring, a spring shell, a cover shell, a pulley and a drive disk. Among them, there are two large springs, both of which are arranged in the spring shell, and both ends are abutted by the convex structure in the spring shell. There are two small springs, both of which are arranged outside the spring shell, and both ends are abutted against the convex fit outside the spring shell. Under the vehicle starting condition, the belt of the vehicle drives the pulley to rotate, the pulley drives the cover shell to rotate, the spring shell rotates with the cover shell to push the large spring, and the large spring pushes the drive disk to move, and the drive disk connects the crankshaft of the vehicle to transmit the torque to the engine. Under the acceleration condition of the vehicle, the crankshaft drives the drive disk to rotate, the drive disk drives the large spring, the large spring pushes the spring shell, the spring shell rotates and compresses the small spring, and the other end of the small spring presses the cover shell, pushing the pulley to rotate (the cover shell and the pulley are interference fit), the cover shell continues to rotate and compresses the small spring until the spring shell contacts the cover shell thrust boss, and the drive disk continues to rotate to push the arc spring to rotate. When the vibration damping decoupler is in the starting condition and the low throttle (acceleration) condition, the rebound of the small spring will cause the spring housing and the cover to knock and make abnormal noise. The force on the large spring will also cause abnormal knocking noise between the spring housing and the large spring, and between the spring housing and the drive plate. The schematic diagram of the abnormal knocking noise under the starting condition and the low throttle condition is as follows: Figure 1 and Figure 2 As shown. Among them, Figure 1 The time domain noise diagram and the corresponding time domain noise colormap diagram of the knocking noise of the vibration reduction decoupler under the starting condition are shown below. Figure 2 The time domain noise diagram and the corresponding time domain noise colormap of the knocking noise of the vibration damping decoupler under low throttle conditions. Figure 1 and Figure 2 It can be seen that the vibration damping decoupler has abnormal knocking noise under low throttle and starting conditions. In order to reduce the abnormal knocking noise of the vibration damping decoupler, the parameters of the vibration damping decoupler can be optimized to achieve the purpose of reducing the abnormal knocking noise.
[0058] As a specific embodiment of the present invention, see Figure 3 The method for reducing the abnormal knocking noise of the vibration damping decoupler of this embodiment may include:
[0059] Step S100, building a target model;
[0060] Step S200, inputting parameters into the target model in real time, wherein the parameters include fixed parameters and load parameters under preset working conditions, the fixed parameters include accessory system parameters, crankshaft system parameters and vibration damper decoupler parameters, and the load parameters include the torque and cylinder pressure of the generator under preset working conditions.
[0061] Step S300, calculating the knocking impulse of the vibration reduction decoupler at different time points under a preset working condition according to the fixed parameters and load parameters at different time points;
[0062] Step S400, determine whether the time point corresponding to the peak value of multiple knocking impulses of the vibration damping decoupler under the preset working condition obtained by calculation is consistent with the time point corresponding to the peak value of multiple knocking impulses obtained by the experiment. If they are consistent, change the parameters of the vibration damping decoupler to reduce the peak value of the knocking impulse, thereby reducing the abnormal knocking sound of the vibration damping decoupler.
[0063] In this embodiment, by building a target model, the knocking impulse of the vibration damping decoupler under starting conditions or low throttle conditions is simulated, and the knocking impulse is obtained by inputting parameters under corresponding conditions, and the knocking impulse of the vibration damping decoupler under starting conditions or low throttle conditions can be reduced by changing the parameters, thereby reducing the abnormal knocking noise of the vibration damping decoupler. This embodiment obtains the knocking impulse of the vibration damping decoupler through a simulation method, and reduces the knocking impulse by changing the parameters of the vibration damping decoupler, thereby reducing the abnormal knocking noise of the vibration damping decoupler, thereby shortening the development cycle of the vibration damping decoupler and reducing the cost of experiments.
[0064] As a specific example, see Figure 4 In step S100 of this embodiment, building a target model may include:
[0065] Step S101, build a standard model, wherein the standard model includes an accessory system model, a vibration damping decoupler model and a crankshaft system model. Specifically, in step S101, the accessory system in this embodiment may include a belt, a drive water pump, a tensioner, a BSG generator, and an air compressor. The crankshaft system may include a piston, a connecting rod, a crankshaft and a DMF (dual mass flywheel), a clutch active end, etc. The standard model is a model built according to each component to match the actual object.
[0066] Step S102, simplifying the standard model to obtain a simplified model, wherein the accessory system model is simplified to obtain a one-dimensional plane model of the accessory system, the crankshaft system standard model is simplified to obtain a one-dimensional torsional vibration model of the crankshaft system, and the vibration damper decoupler model is simplified to obtain a one-dimensional torsional knock model of the vibration damper decoupler.
[0067] In step S102, the standard accessory system model is simplified to obtain a one-dimensional plane model of the accessory system (see Figure 5), simplify the crankshaft system model to a one-dimensional torsional vibration model of the crankshaft system (see Figure 6 ), the vibration damping decoupler model is simplified to obtain the one-dimensional torsional knocking model of the vibration damping decoupler (see Figure 7 ), using one-dimensional software, only considering torsional vibration. Simplify the belt in the accessory system model linearly, ignore the belt slippage, build a transient torsional vibration model, and speed up the calculation (efficiency increased by 99%).
[0068] In this embodiment, by simplifying each system into a planar system and a one-dimensional torsional system, the coupling of the planar system and the torsional system can be achieved, and whether there is a knocking risk for the vibration reduction decoupler under transient conditions can be quickly evaluated.
[0069] Step S103, see Figure 8 , the one-dimensional plane model of the accessory system, the one-dimensional torsional knock model of the vibration damper decoupler, and the one-dimensional torsional vibration model of the crankshaft system are connected in sequence to obtain the target model.
[0070] In step S103, the purpose of sequentially connecting the one-dimensional plane model of the accessory system, the one-dimensional torsional knocking model of the vibration damper decoupler and the one-dimensional torsional vibration model of the crankshaft system is to simulate the state in which the vibration damper decoupler is simultaneously matched with the accessory system and the crankshaft system, thereby making the target system closer to the actual operating condition of the vibration damper decoupler and improving the accuracy of the simulation.
[0071] As a specific embodiment of the present invention, Fig. 9 As shown, in step S200 of this embodiment, the step of inputting parameters into the target model may include:
[0072] Step S201, collecting fixed parameters and corresponding load parameters under preset working conditions;
[0073] Step S202, inputting fixed parameters into the target model;
[0074] Step S203: input corresponding load parameters into the target model under the preset working conditions.
[0075] As a specific embodiment, step S202, the step of inputting fixed parameters into the target model may include:
[0076] Input the accessory system parameters into the simplified model of the accessory system; wherein the accessory system parameters include the geometric position and rotating part inertia of the driving water pump, tensioner, BSG generator, air compressor, belt type and size;
[0077] Input crankshaft system parameters into the simplified model of the crankshaft system; wherein the crankshaft system parameters include stiffness and inertia of a pulley, a balance shaft, a crankshaft, a dual mass flywheel, and an active end of a clutch; and
[0078] Input the vibration damper decoupler parameters into the simplified model of the vibration damper decoupler; wherein the vibration damper decoupler parameters include the stiffness, inertia and geometric limit size of the relevant components of the vibration damper decoupler.
[0079] Fixed parameters are inherent parameters, which basically do not change with time or changes in operating conditions. Different models or different types of accessory systems, crankshaft systems or vibration decouplers have different inherent parameters.
[0080] As a specific embodiment, in step S203, inputting corresponding load parameters into the target model under the preset working condition may include:
[0081] Under the starting condition, the torque of the generator is input into the one-dimensional plane model of the accessory system in the target model, and the cylinder pressure of the generator is input into the one-dimensional torsional vibration model of the crankshaft system; or
[0082] The cylinder pressure of the generator is input into the one-dimensional torsional vibration model of the crankshaft system under low throttle conditions.
[0083] Load parameters are input into the target model as excitations. The load parameters can vary over time or over load conditions.
[0084] Among the load parameters, the torque of the BSG motor and the engine starting cylinder pressure are used as the boundary of the starting condition, and the speed from idle to 4000rpm is used as the boundary of the low throttle condition.
[0085] As a specific embodiment of the present invention, see Fig.10 , step S300, calculating the knocking impulse of the vibration damping decoupler at different times under the preset working condition according to the fixed parameters and the load parameters may include:
[0086] Step S301, calculating the spring knocking torque and knocking speed of the vibration damping decoupler under a preset working condition according to the fixed parameters and the load parameters;
[0087] Step S302, multiplying the spring striking torque and the striking speed to obtain the striking impulse.
[0088] In this embodiment, after the fixed parameters and the load parameters are input into the target model, the knocking torque and the knocking speed are calculated, and the knocking impulse is obtained by multiplying the knocking torque and the knocking speed. Since the load parameters are input in the order of time, the knocking torque and the knocking speed are also output in the order of time, so the final knocking impulse is output in the order of time, forming a corresponding curve with time.
[0089] As a specific embodiment of the present invention, see Fig.11 In step S302, after multiplying the spring striking torque and the striking speed to obtain the striking impulse, the following steps may also be included:
[0090] Step S303, drawing a first curve of the tapping impulse changing with time, and obtaining a first peak value of the tapping impulse in the first curve and its corresponding time;
[0091] Step S304, obtaining and storing a second curve of the knocking impulse changing with time obtained in the experiment, and obtaining a second peak value of the knocking impulse in the second curve and its corresponding time;
[0092] Step S305, when the time corresponding to the first peak value coincides with the time corresponding to the second peak value, the vibration reduction decoupler parameters are changed to reduce the peak value of the knocking impulse.
[0093] In this embodiment, in step S303, the vibration damping decoupler has the problem of abnormal knocking noise, so the knocking impulse changes with time. During the change, a maximum value, namely the first peak value, will appear. The peak value indicates that the knocking situation is the most serious at this time point under the condition of this parameter.
[0094] In a specific embodiment, the parameters of the damping decoupler input into the target model may include large spring parameters and small spring parameters. The large spring parameters include the stiffness, stroke, center distance and warning torque of the large spring, and the small spring parameters include the stiffness, stroke and center distance of the small spring.
[0095] Specifically, some relevant parameters input into the target model may include data shown in the following table:
[0096]
[0097]
[0098] Finally, the first curve of the knock impulse of a certain model changing with time obtained by using the vibration damping decoupler parameters is as follows: Fig.12 shown.
[0099] In step S304, since the vibration-damping decoupler also has abnormal knocking noise during the experiment, the knocking impulse will change over time, and a maximum value, namely the second peak value, will also appear.
[0100] In step S305, the purpose of matching the time corresponding to the first peak and the time corresponding to the second peak in this embodiment is to verify whether the target model is correct, and at the same time confirm whether the abnormal knocking noise occurs in a specific part of the vibration damping decoupler (that is, the rebound of the small spring mentioned above will cause the spring shell and the cover shell to knock and make abnormal noise. The force on the large spring will also cause abnormal knocking noise between the spring shell and the large spring, and between the spring shell and the drive disk.).
[0101] Specifically, in step S305 of this embodiment, when the time corresponding to the first peak value matches the time corresponding to the second peak value, it indicates that the target model of this embodiment is correct, and the abnormal knocking noise comes from a specific part of the vibration damping decoupler. If they do not match, it means that the abnormal sound is not from the above-mentioned specific part, and it cannot be optimized by this method. This embodiment is mainly used to reduce the abnormal sound problem in a specific part of the vibration damping decoupler. Therefore, after the above comparison and matching, the parameters of the vibration damping decoupler can be changed, and the knocking impulse can be obtained by inputting the changed parameters into the target model to continuously reduce the peak value of the knocking impulse, thereby simplifying the abnormal knocking noise of the vibration damping decoupler.
[0102] As a specific embodiment of the present invention, see Fig.13 In step S400 of this embodiment, the step of changing the vibration damping decoupler parameters to adjust the peak value of the knocking impulse to reduce the knocking noise of the vibration damping decoupler may include:
[0103] Step S401, changing the vibration decoupler parameters input into the target model.
[0104] Specifically, the vibration damping decoupler parameters can be changed within the range shown in the figure below, thereby continuously adjusting the size of the first peak output from the target model.
[0105] parameter GEP3 BSG unit TVD monomer frequency 320 Hz HUB(Inertia) Within 0.00601+50% <![CDATA[kg.m 2 ]]> RING 0.0097 <![CDATA[kg.m 2 ]]> BASF 0.0033 <![CDATA[kg.m 2 ]]> Spring shell (plastic) 0.000403 <![CDATA[kg.m 2 ]]> Small spring rate 0.6 Nm / ° Small spring travel 0 / 29.5±20％ ° From the center of the small spring to the center of the circle 70.5±20％ mm High spring rate 5.1+2 times Nm / ° Large spring mass 130 / piece g High spring preload torque 0.5+5 times Nm From the center of the large spring to the center of the circle 60±20％ mm
[0106] Step S402, obtaining a new third curve of the knock impulse changing with time according to the changed vibration damping decoupler parameters, and obtaining a third peak value of the knock impulse in the third curve.
[0107] Step S403, comparing the third peak value with the preset peak value, and when the third peak value is smaller than the preset peak value, storing the changed vibration damping decoupler parameters.
[0108] Since the size of the third peak value obtained after changing the parameters of the vibration damping decoupler is uncertain compared with the first peak value, and the size of the second peak value obtained from the actual test cannot be determined, a preset peak value is preset in the present application. When the third peak value is smaller than the preset peak value, it indicates that the knocking noise problem of the vibration damping decoupler under the parameters is smaller, so that the vibration damping decoupler can be examined according to the parameters and the performance of the vibration damping decoupler can be optimized.
[0109] Of course, in actual operation, the smaller the value of the third peak, the better. In a certain experiment, when the third peak is less than the preset peak, it will be stored, and in subsequent experiments, the parameters of the vibration decoupler can be continuously updated to compare the new peak with the previous smaller peak, thereby continuously optimizing the performance of the vibration decoupler and reducing the knocking noise of the vibration decoupler as much as possible.
[0110] In this embodiment, taking the low throttle condition as an example, the time domain noise colormap obtained after inputting the original parameters and changing the parameters of the vibration reduction decoupler is as follows: Fig.14 It is shown that the method of this embodiment can be used to optimize the performance of the vibration damping decoupler and reduce the knocking noise of the vibration damping decoupler. Taking the starting condition as an example, the time domain noise diagram obtained after inputting the original parameters and changing the parameters of the vibration damping decoupler is as follows: Fig.15 As shown. Fig.15 It can be seen that after changing the parameters of the vibration damping decoupler, the knocking noise of the vibration damping decoupler is significantly reduced.
[0111] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.
Claims
1. A method for reducing the knocking noise of a vibration damping decoupler, which is used to reduce the knocking noise of the vibration damping decoupler after it is matched with the accessory system and crankshaft system of the vehicle under a preset working condition of the vehicle, wherein: The preset operating condition includes a low throttle operating condition or a starting operating condition, and is characterized in that it includes: Build a target model; Inputting parameters into the target model in real time, wherein the parameters include fixed parameters and load parameters under the preset working condition, the fixed parameters include accessory system parameters, crankshaft system parameters and vibration damping decoupler parameters, and the load parameters include torque and cylinder pressure of the generator under the preset working condition; Calculating the knocking impulse of the vibration reduction decoupler at different time points under the preset working condition according to the fixed parameters and the load parameters at different time points; Determine whether the calculated time point corresponding to the peak value of the multiple knocking impulses of the vibration damping decoupler under the preset working condition is consistent with the time point corresponding to the peak value of the multiple knocking impulses obtained in the experiment; if they are consistent, change the parameters of the vibration damping decoupler to reduce the peak value of the knocking impulse, thereby reducing the abnormal knocking sound of the vibration damping decoupler; Building the target model includes: Building a standard model, wherein the standard model includes an accessory system model, a vibration damping decoupler model and a crankshaft system model; The standard model is simplified to obtain a simplified model, wherein the accessory system model is simplified to obtain a one-dimensional plane model of the accessory system, the crankshaft system model is simplified to obtain a one-dimensional torsional vibration model of the crankshaft system, and the vibration damping decoupler model is simplified to obtain a one-dimensional torsional knocking model of the vibration damping decoupler; The target model is obtained by sequentially connecting the one-dimensional plane model of the accessory system, the one-dimensional torsional knock model of the vibration damping decoupler and the one-dimensional torsional vibration model of the crankshaft system.
2. The method for reducing the abnormal knocking noise of the vibration damping decoupler according to claim 1, characterized in that: The step of inputting parameters into the target model in real time comprises: Collecting the fixed parameters and the corresponding load parameters under the preset working conditions; inputting the fixed parameters into the target model; The corresponding load parameters are input into the target model under the preset working condition.
3. The method for reducing the abnormal knocking noise of the vibration damping decoupler according to claim 2, characterized in that: The step of inputting the fixed parameters into the target model comprises: Input the accessory system parameters into the simplified model of the accessory system; wherein the accessory system parameters include the geometric position and rotating part inertia of the driving water pump, tensioner, BSG generator, and air compressor, and the belt type and size; Inputting the crankshaft system parameters into the simplified model of the crankshaft system; wherein the crankshaft system parameters include the stiffness and inertia of the pulley, the balance shaft, the crankshaft, the dual mass flywheel, and the active end of the clutch; and Input the vibration damping decoupler parameters into the simplified model of the vibration damping decoupler; wherein the vibration damping decoupler parameters include the stiffness, inertia and geometric limit size of the relevant components of the vibration damping decoupler.
4. The method for reducing the knocking noise of a vibration damping decoupler according to claim 2, characterized in that: Inputting corresponding load parameters into the target model under the preset working condition includes: Under the starting condition, inputting the torque of the generator into the one-dimensional plane model of the accessory system in the target model, and inputting the cylinder pressure of the generator into the one-dimensional torsional vibration model of the crankshaft system; or The cylinder pressure of the generator is input into the one-dimensional torsional vibration model of the crankshaft system under the low throttle operating condition.
5. The method for reducing the abnormal knocking noise of the vibration damping decoupler according to claim 2, characterized in that: Calculating the knocking impulse of the vibration damping decoupler at different times under the preset working condition according to the fixed parameter and the load parameter includes: Calculating the spring knocking torque and the knocking speed of the vibration damping decoupler under the preset working condition according to the fixed parameter and the load parameter; The knocking impulse is obtained by multiplying the spring knocking torque and the knocking speed.
6. The method for reducing the abnormal knocking noise of the vibration damping decoupler according to claim 5, characterized in that: After multiplying the spring striking torque and the striking speed to obtain the striking impulse, the following further comprises: Draw a first curve showing the change of the knocking impulse over time, and obtain a first peak value of the knocking impulse in the first curve and its corresponding time; Acquire and store a second curve of the knocking impulse changing with time obtained by the experiment, and obtain a second peak value of the knocking impulse in the second curve and its corresponding time; When the time corresponding to the first peak value coincides with the time corresponding to the second peak value, the vibration reduction decoupler parameters are changed to reduce the peak value of the knocking impulse.
7. The method for reducing abnormal knocking noise of a vibration damping decoupler according to claim 6, characterized in that: The step of changing the vibration damping decoupler parameters to adjust the peak value of the knocking impulse and thereby reduce the knocking noise of the vibration damping decoupler comprises: changing the vibration decoupler parameters input into the target model; Obtaining a new third curve of the knock impulse changing with time according to the changed parameters of the vibration damping decoupler, and obtaining a third peak value of the knock impulse in the third curve; The third peak value is compared with a preset peak value, and when the third peak value is smaller than the preset peak value, the changed vibration damping decoupler parameter is stored.
8. The method for reducing the abnormal knocking noise of a vibration damping decoupler according to claim 7, characterized in that: The vibration damping decoupler includes a large spring, a small spring, a spring shell, a cover shell, a pulley and a drive plate; wherein, there are two large springs, both of which are arranged in the spring shell, and both ends are abutted by the protrusion structure in the spring shell; there are two small springs, both of which are arranged outside the spring shell, and both ends are abutted against the protrusion outside the spring shell; the vibration damping decoupler parameters include large spring parameters and small spring parameters, the large spring parameters include the stiffness, stroke, center distance and warning torque of the large spring, and the small spring parameters include the stiffness, stroke and center distance of the small spring.