CN114398713A - A method for reducing the abnormal knocking noise of a vibration damping decoupler in a vehicle - Google Patents

Abstract

The invention provides a method for reducing knocking abnormal sound of a vibration damping decoupler, and relates to the technical field of vehicle simulation. The invention discloses a method for reducing knocking abnormal sound of a vibration damping decoupler, which comprises the following steps: building a target model; inputting parameters into the target model in real time; calculating the knocking impulse of the vibration damping decoupler at different time points under a preset working condition according to the fixed parameters and the load parameters at different time points; and judging whether the time point corresponding to the peak value in the plurality of knocking impulses of the vibration damping decoupler is consistent with the time point corresponding to the experimentally obtained peak value under the preset working condition, and if so, changing the parameters of the vibration damping decoupler to reduce the peak value of the knocking impulses. According to the invention, the knocking impulse of the vibration damping decoupler is obtained by a simulation method, and the knocking impulse is reduced by changing the parameters of the vibration damping decoupler, so that the knocking abnormal sound of the vibration damping decoupler is reduced, the development cycle of the vibration damping decoupler is short, and the experiment cost is low.

Description

A method for reducing the abnormal knocking noise of a vibration damping decoupler in a vehicle

technical field

The invention relates to the technical field of vehicle simulation, in particular to a method for reducing abnormal knocking noise of a vibration damping decoupler in a vehicle.

Background technique

At present, in order to dampen the vibration of the accessory system and the crankshaft system, a damping decoupler is designed inside the vehicle. The damping decoupler has a good damping effect when the vehicle is in high-speed and large-acceleration conditions. However, when the vehicle is in the starting condition or the small accelerator condition, the vibration damping decoupler will have the problem of knocking and abnormal noise when it is matched with the crankshaft system and the accessory system to reduce the vibration. At present, the test method is mainly used to solve the abnormal knocking noise of the vibration damping decoupler under the starting condition or small accelerator condition. The development cycle of the coupler is long, the test cost is high, and it is difficult to troubleshoot the knocking problem that occurs in the matching between systems.

SUMMARY OF THE INVENTION

An object of the first aspect of the present invention is to provide a method for reducing the abnormal knocking noise of a vibration damping decoupler in a vehicle to solve the problems of long development period and high experiment cost of the vibration damping decoupler in the prior art .

Another object of the first aspect of the present invention is to solve the problem of the complex model of the simulation model in the prior art.

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 noise of the vibration damping decoupler after matching with the accessory system and the crankshaft system of the vehicle under the preset working conditions of the vehicle. Abnormal knocking sound, wherein the preset working condition includes a small throttle working condition or a starting working condition, including:

Build a target model;

real-time input of parameters into the target model, wherein the parameters include fixed parameters and load parameters under the preset operating conditions, and the fixed parameters include accessory system parameters, crankshaft system parameters and vibration reduction decoupler parameters, The load parameters include the torque and cylinder pressure of the generator under the preset operating conditions;

Calculate the impact impulse of the vibration damping decoupler at different time points under the preset working condition according to the fixed parameter and the load parameter at different time points;

judging whether the calculated time point corresponding to the peak value of the multiple knock impulses of the vibration reduction decoupler under the preset working condition is consistent with the time point corresponding to the peak value of the multiple knock impulse obtained experimentally, If they match, the parameters of the vibration damping decoupler are changed to reduce the peak value of the knocking impulse, thereby reducing the abnormal knocking noise of the vibration damping decoupler.

Optionally, 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;

Simplify the standard model to obtain a simplified model, wherein, after the accessory system model is simplified, a one-dimensional plane model of the accessory system is obtained, and the crankshaft system model is simplified to obtain a one-dimensional torsional vibration model of the crankshaft system, and the vibration reduction and decoupling are obtained. The one-dimensional torsional percussion model of the vibration damping decoupler is obtained after the simplification of the decoupler model;

The target model is obtained by sequentially connecting the one-dimensional plane model of the accessory system, the one-dimensional torsional knocking model of the vibration damping decoupler, and the one-dimensional torsional vibration model of the crankshaft system.

Optionally, the step of inputting parameters into the target model includes:

collecting the fixed parameter and the load parameter corresponding to the preset working condition;

inputting the fixed parameters into the target model;

The corresponding load parameters are input into the target model under the preset working conditions.

Optionally, the step of inputting the fixed parameters into the target model includes:

Inputting the accessory system parameters into the accessory system simplified model; wherein, the accessory system parameters include the geometric position and inertia of the rotating part of the driving water pump, the tensioner, the BSG generator, the air compressor, the type and size of the belt;

inputting the crankshaft system parameters into the simplified crankshaft system model; wherein the crankshaft system parameters include pulleys, balance shafts, crankshafts, dual-mass flywheels, stiffness and inertia at the active end of the clutch; and

The parameters of the damping decoupler are input into the simplified model of the damping decoupler; wherein the parameters of the damping decoupler include the stiffness, inertia and geometric limit size of the relevant components of the damping and decoupling device.

Optionally, inputting corresponding load parameters into the target model under the preset working conditions includes:

The torque of the generator is input into the one-dimensional planar model of the accessory system in the target model under the starting condition, while the cylinders of the generator are input into the one-dimensional torsional vibration model of the crankshaft system pressure; or

The cylinder pressure of the generator is input into the one-dimensional torsional vibration model of the crankshaft system under the small throttle condition.

Optionally, calculating, according to the fixed parameter and the load parameter, the knocking impulse of the vibration damping decoupler at different times under the preset working condition includes:

Calculate the spring knocking torque and knocking speed of the vibration damping decoupler under the preset working condition according to the fixed parameter and the load parameter;

The knock impulse is obtained by multiplying the spring knock torque and knock speed.

Optionally, after multiplying the spring knocking torque and knocking speed to obtain the knocking impulse, the method further includes:

Drawing a first curve of the percussion impulse varying with time, and obtaining the first peak value of the percussion impulse in the first curve and its corresponding time;

Acquire and store a second curve of the percussion impulse obtained by the experiment as a function of time, and obtain the second peak value of the percussion 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 parameters of the vibration damping decoupler are changed to reduce the peak value of the knocking impulse.

Optionally, the step of changing the parameters of the vibration damping decoupler to adjust the peak value of the knocking impulse so as to reduce the abnormal knocking noise of the vibration damping decoupler includes:

changing the damping decoupler parameters input into the target model;

obtaining a new third curve of the knocking impulse changing with time according to the changed parameters of the vibration damping decoupler, and obtaining a third peak value of the knocking 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 parameters of the vibration damping decoupler are stored.

Optionally, the vibration damping decoupler includes a large spring, a small spring, a spring shell, a cover, a pulley and a drive disk; wherein, the number of large springs is two, both of which are arranged in the spring shell, and both ends are The protruding structures in the spring shell are in contact; the number of small springs is two, both of which are arranged outside the spring shell, and both ends abut against the protrusions outside the spring shell; the parameters of the vibration damping decoupler include large spring parameters and Small spring parameters, the large spring parameters include the stiffness, stroke, center-to-center distance and early warning torque of the large spring, and the small spring parameters include the small spring's stiffness, stroke, and center-to-center distance.

The invention simulates the knocking impulse of the vibration damping decoupler under the starting condition or the small throttle condition by building a target model, obtains the knocking impulse by inputting the parameters under the corresponding working condition, and can change the parameters to obtain the knocking impulse. In order to reduce the knocking impulse of the vibration damping decoupler in the starting condition or the small accelerator condition, and then reduce the abnormal knocking noise of the vibration damping decoupler, the present invention obtains the knocking of the vibration damping decoupler by means of a simulation method. By changing the parameters of the vibration damping decoupler, the impact impulse is reduced, thereby reducing the abnormal knocking noise of the vibration damping decoupler, so that the development cycle of the vibration damping decoupler is short and the experiment cost is low.

By simplifying each system and simplifying it into a plane system and a one-dimensional torsion system, the invention can realize the coupling of the plane system and the torsion system, and can quickly evaluate whether there is a knocking risk of the vibration damping decoupler under transient conditions.

The above and other objects, advantages and features of the present invention will be more apparent to those skilled in the art from the following detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of example and not limitation with reference to the accompanying drawings. The same reference numbers in the figures designate the same or similar parts or parts. It will be understood by those skilled in the art that the drawings are not necessarily to scale. In the attached picture:

Fig. 1 is the time-domain noise map and the corresponding time-domain noise colormap of the abnormal knocking noise of the vibration damping decoupler under the condition of small throttle;

Fig. 2 is the time-domain noise diagram and the corresponding time-domain noise colormap diagram of the abnormal knocking noise of the vibration damping decoupler under startup conditions;

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;

FIG. 4 is a schematic flow chart of steps of building a target model according to a specific embodiment of the present invention;

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;

6 is a schematic diagram of a crankshaft system model simplified to a one-dimensional torsional vibration model of the crankshaft system according to a specific embodiment of the present invention;

7 is a schematic diagram of a one-dimensional torsional percussion model of a vibration-damping decoupler obtained after the vibration-damping decoupler model is simplified according to a specific embodiment of the present invention;

8 is a schematic diagram of obtaining a target model by sequentially connecting the one-dimensional plane model of the accessory system, the one-dimensional torsional knocking model of the vibration damping decoupler, and the one-dimensional torsional vibration model of the crankshaft system according to a specific embodiment of the present invention;

9 is a schematic flow chart of the steps of inputting parameters into the target model according to a specific embodiment of the present invention;

Fig. 10 is a schematic flow chart of calculating the shock impulse of the vibration damping decoupler at different times under preset working conditions according to fixed parameters and load parameters according to a specific embodiment of the present invention;

Fig. 11 is a schematic flow chart of calculating the shock impulse of the vibration damping decoupler at different times under preset operating conditions according to fixed parameters and load parameters according to a specific embodiment of the present invention;

12 is a schematic diagram of a first curve of the percussion impulse of a certain vehicle model obtained by using the parameters of the vibration damping decoupler with time according to a specific embodiment of the present invention;

13 is a schematic flowchart of steps of changing the parameters of the vibration damping decoupler to adjust the peak value of the knocking impulse to reduce the abnormal knocking noise of the vibration damping decoupler according to a specific embodiment of the present invention;

Fig. 14 is the time-domain noise colormap obtained after inputting the original parameters and changing the parameters of the vibration damping decoupler under the condition of small throttle;

Figure 15 is the time-domain noise diagram obtained after inputting the original parameters and changing the parameters of the vibration damping decoupler under the starting condition.

Detailed ways

As a specific embodiment of the present invention, the method for reducing the abnormal knocking noise of a vibration damping decoupler in this embodiment is used to reduce the relationship between the vibration damping decoupler and the accessory system and the vehicle's accessory system under the preset working conditions of the vehicle. The abnormal knocking sound after the crankshaft system is matched, wherein the preset working condition includes a small throttle working condition or a starting working condition.

Specifically, in one embodiment, currently used damping decouplers may include a large spring, a small spring, a spring case, a housing, a pulley, and a drive disk. The number of large springs is two, both of which are arranged in the spring case, and both ends are abutted by the protruding structures in the spring case. The number of small springs is two, both of which are arranged outside the spring shell, and the two ends abut against the protrusions outside the spring shell for cooperation. In the starting condition of the vehicle, the belt of the vehicle drives the pulley to rotate, the pulley drives the casing to rotate, the spring casing rotates with the casing to push the large spring, and the large spring pushes the driving disc to move, and the driving disc is connected to the crankshaft of the vehicle, thereby Transmit torque to the engine. Under the acceleration condition of the vehicle, the crankshaft drives the drive disc to rotate, the drive disc drives the large spring, the large spring pushes the spring case, the spring case rotates and compresses the small spring, and the other end of the small spring presses the cover case, pushing the pulley to rotate (the cover case and the belt) The wheel is an interference fit), the casing continues to rotate and compresses the small spring until the spring casing contacts the thrust boss of the casing, and the drive plate continues to rotate, which will push the arc spring to rotate. When the damping decoupler is in the starting condition and the small accelerator (acceleration) condition, the rebound of the small spring will cause the knock of the spring case and the cover to make abnormal noise. The force of the large spring will also cause abnormal knocking noise between the spring case and the large spring, the spring case and the drive disc. The schematic diagrams of the abnormal knocking noise under the starting condition and the small accelerator condition are shown in Figure 1 and Figure 2. Among them, Figure 1 is the time-domain noise diagram and the corresponding time-domain noise colormap of the abnormal sound of the vibration damping decoupler under the starting condition, and Figure 2 is the percussion of the vibration damping decoupler under the small throttle condition. The time-domain noise map of abnormal noise and the corresponding time-domain noise colormap map. It can be seen from Figure 1 and Figure 2 that the vibration damping decoupler has abnormal knocking noises when the throttle is released and the start is released. In order to reduce the problem of the abnormal knocking sound of the vibration damping decoupler, the purpose of reducing the abnormal knocking sound can be achieved by optimizing the parameters of the vibration damping decoupler.

As a specific embodiment of the present invention, referring to FIG. 3 , the method for reducing the abnormal knocking noise of the vibration damping decoupler in this embodiment may include:

Step S100, build a target model;

Step S200, input 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 reduction decoupler parameters, and the load parameters include generators Torque and cylinder pressure at preset operating conditions.

Step S300, according to the fixed parameters and load parameters at different time points, calculate the impact impulse of the vibration damping decoupler at different time points under preset working conditions;

Step S400, judging whether the time point corresponding to the peak value in the multiple knock impulses obtained by the calculation under the preset working condition is consistent with the time point corresponding to the peak value in the multiple knock impulse obtained by the experiment, if If it matches, change the parameters of the vibration damping decoupler to reduce the peak value of the knock impulse, thereby reducing the abnormal knocking noise of the vibration damping decoupler.

In this embodiment, by building a target model, the knocking impulse of the vibration damping decoupler is simulated under the starting condition or the small throttle condition, and the knocking impulse is obtained by inputting the parameters under the corresponding working condition, and can be obtained by Change the parameters to reduce the knocking impulse of the vibration damping decoupler in the starting condition or the small throttle condition, thereby reducing the abnormal knocking noise of the vibration damping decoupler. In this embodiment, the vibration damping decoupling is obtained by the simulation method. By changing the parameters of the vibration damping decoupler to reduce the percussion impulse, thereby reducing the abnormal knocking noise of the vibration damping decoupler, the development cycle of the vibration damping decoupler is short and the cost of the experiment is shortened. Low.

As a specific embodiment, referring to FIG. 4 , in step S100 of this embodiment, building a target model may include:

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 driving water pump, a tensioner, a BSG generator, and an air compressor. The crankshaft system may include pistons, connecting rods, crankshafts, and DMF (dual mass flywheel), clutch drive end, and the like. The standard model is a model built according to each component that matches the real object.

Step S102: Simplify the standard model to obtain a simplified model, wherein, after the model of the accessory system is simplified, a one-dimensional plane model of the accessory system is obtained; after the standard model of the crankshaft system is simplified, a one-dimensional torsional vibration model of the crankshaft system is obtained; A one-dimensional torsional tapping model of the damping decoupler is obtained.

In step S102 , the standard accessory system model is simplified to obtain a one-dimensional plane model of the accessory system (see FIG. 5 ), the crankshaft system model is simplified into a one-dimensional torsional vibration model of the crankshaft system (see FIG. 6 ), and the vibration reduction decoupler After the model is simplified, the one-dimensional torsional knocking model of the vibration damping decoupler is obtained (see Figure 7). The one-dimensional software method is used to only consider the torsional vibration. The belt in the accessory system model is linearly simplified, and the belt slip is not considered, and a transient torsional vibration model is built to speed up the calculation (the efficiency is increased by 99%).

In this embodiment, by simplifying each system and simplifying it into a planar system and a one-dimensional torsional system, the coupling of the planar system and the torsional system can be realized, and it is possible to quickly evaluate whether the vibration damping decoupler has knocking under transient conditions. risk.

Step S103 , referring to FIG. 8 , connect the one-dimensional plane model of the accessory system, the one-dimensional torsional knocking model of the vibration damping decoupler, and the one-dimensional torsional vibration model of the crankshaft system in sequence to obtain the target model.

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 damping decoupler, and the one-dimensional torsional vibration model of the crankshaft system is to simulate the vibration damping decoupler, the accessory system and the crankshaft system. At the same time, the matching state makes the target system closer to the actual operating conditions of the vibration damping decoupler and improves the accuracy of the simulation.

As a specific embodiment of the present invention, as shown in FIG. 9 , in step S200 of this embodiment, the step of inputting parameters into the target model may include:

Step S201, collecting fixed parameters and corresponding load parameters under preset working conditions;

Step S202, input fixed parameters into the target model;

Step S203 , inputting corresponding load parameters into the target model under a preset working condition.

As a specific embodiment, in step S202, the step of inputting fixed parameters into the target model may include:

Input the parameters of the accessory system into the simplified model of the accessory system; among them, the parameters of the accessory system include the geometric position of the driving water pump, the tensioner, the BSG generator, the air compressor, the inertia of the rotating part, the type and size of the belt;

input crankshaft system parameters into the simplified model of the crankshaft system; wherein the crankshaft system parameters include the stiffness and inertia of the pulley, balancer shaft, crankshaft, dual mass flywheel, the driving end of the clutch; and

Input the parameters of the damping decoupler into the simplified model of the damping decoupler; wherein, the parameters of the damping decoupler include the stiffness, inertia and geometric limit size of the relevant parts of the damping decoupler.

Fixed parameters are inherent parameters that basically do not change with time or changes in operating conditions. Different models or different models of accessory systems, crankshaft systems or damping decouplers have different inherent parameters.

As a specific embodiment, in step S203, inputting the corresponding load parameters into the target model under the preset working conditions may include:

Input the torque of the generator into the one-dimensional plane model of the accessory system in the target model under starting conditions, and input the cylinder pressure of the generator into the one-dimensional torsional vibration model of the crankshaft system at the same time; or

The cylinder pressure of the generator is input into the one-dimensional torsional vibration model of the crankshaft system under small throttle conditions.

Load parameters are entered into the target model as excitations. This load parameter can vary with time or operating conditions.

Among them, 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. From idle to 4000rpm, as the boundary of small throttle conditions.

As a specific embodiment of the present invention, referring to FIG. 10 , in step S300, calculating the shock impulse of the vibration damping decoupler at different times under preset working conditions according to fixed parameters and load parameters may include:

Step S301, calculating the spring knocking torque and knocking speed of the vibration damping decoupler under preset working conditions according to the fixed parameters and load parameters;

Step S302, multiplying the spring knocking torque and the knocking speed to obtain the knocking impulse.

In this embodiment, the percussion torque and percussion speed are calculated after inputting the fixed parameters and the load parameters into the target model, and the percussion impulse is obtained by multiplying the percussion torque and percussion speed. Since the load parameters are input in the order of time, the obtained percussion torque and percussion speed are also output in the order of time, so the final percussion impulse is output in the order of time, forming a corresponding curve with time.

As a specific embodiment of the present invention, referring to FIG. 11 , in step S302, after multiplying the spring knocking torque and the knocking speed to obtain the knocking impulse, it may further include:

Step S303, drawing a first curve of the percussion impulse changing with time, and obtaining the first peak value of the percussion impulse in the first curve and its corresponding time;

Step S304, acquiring and storing the second curve of the percussion impulse obtained by the experiment as a function of time, and acquiring the second peak value of the percussion impulse in the second curve and its corresponding time;

Step S305, when the time corresponding to the first peak value coincides with the time corresponding to the second peak value, the parameters of the vibration damping decoupler are changed to reduce the peak value of the knocking impulse.

In this embodiment, in step S303, the vibration reduction decoupler has the problem of abnormal knocking sound, so the knocking impulse is constantly changing with time. In the process of changing, there will be a maximum value, that is, the first peak value , the peak value indicates that the knocking is the most serious at this time point in the case of this parameter.

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 early warning torque of the large spring, and the small spring Parameters include the stiffness, travel, and center-to-center distance of the small spring.

Specifically, some relevant parameters input into the target model can include the data shown in the following table:

Figure 12 shows the first curve of the knock impulse of a certain vehicle model that changes with time finally obtained by using the parameters of the vibration damping decoupler.

In step S304, since the vibration-damping decoupler also has abnormal knocking noise during the experiment, the knocking impulse will also change with time, and there will also be a maximum value, that is, the second peak value. .

In step S305, the purpose of matching the time corresponding to the first peak value and the time corresponding to the second peak value in this embodiment is to verify whether the target model is correct, and to confirm whether the abnormal knocking noise is caused by the vibration reduction decoupler. The rebound of a specific part (that is, the above-mentioned small spring will cause abnormal sound when the spring case and the cover are knocked). The force of the large spring will also cause abnormal knocking between the spring case and the large spring, the spring case and the drive disc. .) .

Specifically, in step S305 in this embodiment, when the time corresponding to the first peak value and the time corresponding to the second peak value match, it indicates that the target model of this embodiment is correct, and the abnormal knocking sound comes from the specific characteristics of the vibration damping decoupler. part. If it does not match, it means that the abnormal noise ratio comes 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 changed parameters can be input into the target model to obtain The percussion impulse is used to continuously reduce the peak of the percussion impulse, thereby simplifying the abnormal percussion sound of the vibration damping decoupler.

As a specific embodiment of the present invention, referring to FIG. 13 , in step S400 of this embodiment, the step of changing the parameters of the vibration damping decoupler to adjust the peak value of the knocking impulse so as to reduce the abnormal knocking noise of the vibration damping decoupler may include: :

Step S401, changing the parameters of the vibration damping decoupler input into the target model.

Specifically, the parameters of the damping decoupler can be changed within the range shown in the figure below, so as to continuously adjust the size of the first peak output from the target model.

parameter GEP3 BSG unit TVD monomer frequency 320 Hz HUB (Inertia) Within 0.00601+50% kg.m² RING 0.0097 kg.m² BASF 0.0033 kg.m² Spring case (plastic) 0.000403 kg.m² small spring rate 0.6 Nm/° Small spring stroke 0/29.5±20% ° Small spring center to circle center 70.5±20% mm high spring rate 5.1+2 times Nm/° Large spring mass 130/root g Large spring preload torque Within 0.5+5 times Nm Large spring center to circle center 60±20% mm

Step S402 , obtaining a new third curve of the knocking impulse changing with time according to the changed parameters of the vibration damping decoupler, and obtaining a third peak value of the knocking impulse in the third curve.

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, store the changed parameters of the vibration reduction decoupler.

Since the magnitudes of the third peak and the first peak obtained after changing the parameters of the vibration damping decoupler are indeterminate, and the magnitude of the second peak obtained by the actual experiment cannot be determined, a preset peak is preset in this application, When the third peak value is smaller than the preset peak value, it indicates that the vibration damping decoupler has less abnormal knocking problem under this parameter, so the vibration damping decoupler can be checked according to this parameter and then the vibration damping decoupler can be optimized. performance.

Of course, in actual operation, the smaller the value of the third peak, the better. During a certain experiment, when the third peak value is smaller than the preset peak value, it will be stored, and in the subsequent experiment process, the parameters of the shock absorption decoupler can be continuously updated, so that the new peak value is the same as the previous smaller peak value. The peak value is compared, so as to continuously optimize the performance of the vibration damping decoupler and reduce the abnormal knocking noise of the vibration damping decoupler as much as possible.

In this embodiment, taking the small throttle condition as an example, the time-domain noise colormap obtained after inputting the original parameters and changing the parameters of the vibration damping decoupler is shown in FIG. 14 . It is illustrated that the performance of the vibration damping decoupler can be well optimized by using the method of this embodiment, and the abnormal knocking noise of the vibration damping decoupler can be reduced. 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 reduction decoupler is shown in Figure 15. It can be seen from Figure 15 that after changing the parameters of the damping decoupler, the abnormal knocking noise of the damping decoupler is significantly reduced.

By now, those skilled in the art will recognize that, although various exemplary embodiments of the present invention have been illustrated and described in detail herein, the present invention may still be implemented in accordance with the present disclosure without departing from the spirit and scope of the present invention. The content directly determines or derives many other variations or modifications consistent with the principles of the invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (9)

1. A method for reducing knocking abnormal sound of a vibration damping decoupler is used for reducing knocking abnormal sound of the vibration damping decoupler after the vibration damping decoupler is matched with an accessory system and a crankshaft system of a vehicle under a preset working condition of the vehicle, wherein the preset working condition comprises a small accelerator working condition or a starting working condition, and is characterized by comprising the following steps of:

building a target model;

inputting parameters into the target model in real time, wherein the parameters comprise fixed parameters and load parameters under the preset working condition, the fixed parameters comprise accessory system parameters, crankshaft system parameters and vibration damping decoupler parameters, and the load parameters comprise 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;

and judging whether the time point corresponding to the peak value in the plurality of knocking impulses of the vibration damping decoupler obtained through calculation is consistent with the time point corresponding to the peak value in the plurality of knocking impulses obtained through experiments under the preset working condition, if so, changing the parameters of the vibration damping decoupler to reduce the peak value of the knocking impulses, and further reducing the knocking abnormal sound of the vibration damping decoupler.

2. The method of reducing rattle noise of a vibration-damping decoupler as set forth in claim 1,

the target model building method comprises the following steps:

building a standard model, wherein the standard model comprises an accessory system model, a vibration reduction decoupler model and a crankshaft system model;

simplifying the standard model to obtain a simplified model, wherein the accessory system model is simplified to obtain an accessory system one-dimensional plane model, the crankshaft system model is simplified to obtain a crankshaft system one-dimensional torsional vibration model, and the damping decoupler model is simplified to obtain a damping decoupler one-dimensional torsional vibration model;

and sequentially connecting the accessory system one-dimensional plane model, the vibration attenuation decoupler one-dimensional torsional knocking model and the crankshaft system one-dimensional torsional vibration model to obtain the target model.

3. The method of reducing rattle noise of a vibration-damping decoupler as set forth in claim 1,

the step of inputting parameters into the target model comprises:

collecting the fixed parameters and the corresponding load parameters under the preset working condition;

inputting the fixed parameters into the target model;

and inputting corresponding load parameters into the target model under the preset working condition.

4. The method of reducing rattle noise of a vibration-damping decoupler as set forth in claim 3,

the step of inputting the fixed parameters into the target model comprises:

inputting the accessory system parameters into the accessory system reduced model; the accessory system parameters comprise geometric positions and rotary part inertia of a driving water pump, a tensioner, a BSG generator and an air compressor, and the type and size of a belt;

inputting the crankshaft system parameters into the crankshaft system simplified model; the parameters of the crankshaft system comprise a belt pulley, a balance shaft, a crankshaft, a dual-mass flywheel and the rigidity and inertia of a driving end of a clutch; and

inputting damping decoupler parameters into the damping decoupler simplified model; and the parameters of the damping decoupler comprise the rigidity, inertia and geometric limit size of related parts of the damping decoupler.

5. The method of reducing rattle noise of a vibration-damping decoupler as set forth in claim 3,

inputting corresponding load parameters into the target model under the preset working condition comprises the following steps:

inputting the torque of the generator into the one-dimensional plane model of the accessory system in the target model under the starting working condition, and simultaneously inputting the cylinder pressure of the generator into the one-dimensional torsional vibration model of the crankshaft system; or

And inputting the cylinder pressure of the generator into the one-dimensional torsional vibration model of the crankshaft system under the working condition of the small accelerator.

6. The method of reducing rattle noise of a vibration-damping decoupler as set forth in claim 3,

calculating the knocking impulse of the vibration damping decoupler at different time under the preset working condition according to the fixed parameters and the load parameters comprises the following steps:

calculating the spring knocking torque and the knocking speed of the vibration damping decoupler under the preset working condition according to the fixed parameters and the load parameters;

and multiplying the spring knocking torque and the knocking speed to obtain the knocking impulse.

7. The method of reducing rattle noise of a vibration-damping decoupler as set forth in claim 6,

after the knocking impulse is obtained by multiplying the spring knocking torque and the knocking speed, the method further comprises the following steps:

drawing a first curve of the variation of the knocking impulse along with time, and obtaining a first peak value of the knocking impulse in the first curve and corresponding time of the first peak value;

acquiring and storing a second curve of the knocking impulse changing along with time obtained by the experiment, and acquiring a second peak value of the knocking impulse in the second curve and corresponding time of the second peak value;

and when the time corresponding to the first peak value is matched with the time corresponding to the second peak value, changing the parameters of the vibration reduction decoupler so as to reduce the peak value of the knocking impulse.

8. The method of reducing rattle noise of a vibration-damping decoupler as set forth in claim 7,

the step of varying the vibration-damping decoupler parameter to adjust the peak magnitude of the tapping impulse to reduce tapping squeak of the vibration-damping decoupler comprises:

changing the vibration-damping decoupler parameters input into the target model;

obtaining a third curve of the new knocking impulse changing along with time according to the changed parameters of the vibration damping decoupler, and obtaining a third peak value of the knocking impulse in the third curve;

and comparing the third peak value with a preset peak value, and storing the changed parameters of the vibration damping decoupler when the third peak value is smaller than the preset peak value.

9. The method of reducing rattle noise of a vibration-damping decoupler of claim 8, wherein the vibration-damping decoupler comprises a large spring, a small spring, a spring shell, a housing, a pulley, and a drive disc; the large springs are arranged in the spring shell, and the two ends of the large springs are abutted by the convex structures in the spring shell; the number of the small springs is two, the small springs are arranged outside the spring shell, and two ends of the small springs are abutted to bulges outside the spring shell for matching; the parameters of the vibration reduction decoupler comprise large spring parameters and small spring parameters, the large spring parameters comprise the rigidity, the stroke, the center distance and the early warning torque of the large spring, and the small spring parameters comprise the rigidity, the stroke and the center distance of the small spring.

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