Simulation system and method for stabilizer bar of automotive suspension system and vehicle

Abstract

The invention discloses an automobile suspension system stabilizer bar simulation system which comprises a preview module used for collecting data, a prediction module connected with the preview module and a CDC shock absorber connected with the prediction module, and the prediction module is arranged to control the CDC shock absorber to output damping force according to set conditions. According to the stabilizer bar simulation system for the automobile suspension system, the damping force range is enlarged through the CDC shock absorber, the damping force of the shock absorber is used for simulating and replacing the function of the stabilizer bar, it is ensured that the function of the stabilizer bar of the automobile suspension system can be accurately simulated, decoupling of the rigidity of chassis elements is achieved through accurate preview and judgment, and the variable of chassis control is reduced. The invention further discloses an automotive suspension system stabilizer bar simulation method.

Description

Technical Field

[0001] The invention belongs to the field of automobile technology, and in particular, relates to a vehicle suspension system stabilizer bar simulation system, method and vehicle. Background Art

[0002] Suspension stiffness is a measure of the suspension's ability to resist deformation. Existing automobile suspension stiffness is usually coupled by shock absorbers, buffer blocks, springs, and stabilizer bar stiffness. When faced with different vehicle model definitions and performance requirements, components of different specifications are needed to meet and achieve the corresponding suspension stiffness.

[0003] With the development of the automobile industry, the stability and comfort of vehicle driving have become important indicators that consumers are increasingly concerned about. As an important suspension system component, the stabilizer bar reduces the roll of the vehicle body by providing additional roll moment when the vehicle turns or encounters uneven roads, thereby improving the vehicle's handling stability and ride comfort. However, there are some problems with the traditional stabilizer bar design, such as fixed stiffness leading to poor performance under different road conditions, and the stabilizer bar has a complex structure and is heavy.

[0004] The Chinese patent application number 201910434954.6 discloses a method and device for analyzing the stiffness of a lateral stabilizer bar. First, a finite element model of the lateral stabilizer bar is established, the shear beam material parameters of the lateral stabilizer bar are obtained, and the first stiffness coefficient of the spring unit is calculated based on the first correspondence between the stiffness coefficient of the spring unit and the shear beam material parameters, and the first stiffness coefficient of the spring unit is determined as the first stiffness coefficient of the lateral stabilizer bar. Since the lateral stabilizer bar can be considered as a torsion bar spring made of spring material from its structural and functional characteristics, it can be simulated by a spring unit when only the linear deformation of the lateral stabilizer bar is considered, and the stiffness coefficient of the spring unit is equivalent to the stiffness coefficient of the lateral stabilizer bar. The modeling is simple, and the stiffness coefficient obtained is derived from the material parameters of the lateral stabilizer bar itself. The simulation is accurate, which improves the accuracy of the stiffness evaluation of the lateral stabilizer bar.

[0005] It is desirable to provide an improved vehicle suspension system stabilizer bar simulation system, particularly with regard to how to accurately simulate the effect of the vehicle suspension system stabilizer bar. Summary of the invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a vehicle suspension system stabilizer bar simulation system, the purpose of which is to ensure that the function of the vehicle suspension system stabilizer bar can be accurately simulated.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a vehicle suspension system stabilizer bar simulation system, including a preview module for collecting data, a prediction module connected to the preview module and a CDC shock absorber connected to the prediction module, and the prediction module is configured to control the CDC shock absorber to output damping force according to set conditions.

[0008] The prediction module is configured to obtain a Z-axis acceleration prediction value and a yaw angular velocity data prediction value.

[0009] The prediction module makes judgments based on the detected data to form a prediction result.

[0010] The setting condition includes that the Z-axis acceleration prediction value is greater than a first setting value or the yaw angular velocity prediction value is greater than a second setting value.

[0011] The CDC shock absorber obtains the actual value of the Z-direction acceleration, and the actual value of the Z-direction acceleration is obtained by detecting the Z-direction acceleration sensor.

[0012] The CDC shock absorber obtains an actual value of the yaw angular velocity, which is obtained by detecting the vehicle speed and the steering wheel angle.

[0013] If the Z-axis acceleration prediction value is not greater than the first set value and the yaw angular velocity prediction value is not greater than the second set value, the prediction module outputs a corresponding damping force according to the prediction result.

[0014] The present invention also provides a method for simulating a stabilizer bar of an automobile suspension system, which adopts the stabilizer bar simulation system of the automobile suspension system and comprises:

[0015] The preview module collects data;

[0016] The prediction module performs collection and judgment;

[0017] The prediction module controls the CDC shock absorber to output a damping force according to a set condition.

[0018] The setting condition includes that the Z-axis acceleration prediction value is greater than a first setting value or the yaw angular velocity prediction value is greater than a second setting value.

[0019] The present invention also provides a vehicle suspension system stabilizer bar simulation system.

[0020] The automobile suspension system stabilizer bar simulation system of the present invention increases the damping force range through the CDC shock absorber, and uses the shock absorber damping force to simulate and replace the function of the stabilizer bar, thereby ensuring that the role of the automobile suspension system stabilizer bar can be accurately simulated, and through precise pre-aiming and judgment, the stiffness of the chassis components is decoupled, thereby reducing the variables of chassis control. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a result schematic diagram of the automobile suspension system stabilizer bar simulation system of the present invention. DETAILED DESCRIPTION

[0022] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly connected by technicians in the technical field to which the present invention belongs. The terminology used in the specification of the present invention is for the purpose of describing specific embodiments and is not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0024] like Figure 1 As shown, the present invention provides a vehicle suspension system stabilizer bar simulation system, including a preview module for collecting data, a prediction module connected to the preview module, and a CDC shock absorber connected to the prediction module, wherein the prediction module is configured to control the CDC shock absorber to output damping force according to set conditions.

[0025] The prediction module is configured to obtain a Z-axis acceleration prediction value and a yaw angular velocity data prediction value.

[0026] The prediction module makes judgments based on the detected data to form a prediction result.

[0027] The setting condition includes that the Z-axis acceleration prediction value is greater than a first setting value or the yaw angular velocity prediction value is greater than a second setting value.

[0028] The CDC shock absorber obtains the actual value of the Z-direction acceleration, and the actual value of the Z-direction acceleration is obtained by detecting the Z-direction acceleration sensor.

[0029] The CDC shock absorber obtains an actual value of the yaw angular velocity, which is obtained by detecting the vehicle speed and the steering wheel angle.

[0030] If the Z-axis acceleration prediction value is not greater than the first set value and the yaw angular velocity prediction value is not greater than the second set value, the prediction module outputs a corresponding damping force according to the prediction result.

[0031] The present invention also provides a method for simulating a stabilizer bar of an automobile suspension system, which adopts the stabilizer bar simulation system of the automobile suspension system and comprises:

[0032] The preview module collects data;

[0033] The prediction module performs collection and judgment;

[0034] The prediction module controls the CDC shock absorber to output a damping force according to a set condition.

[0035] The setting condition includes that the Z-axis acceleration prediction value is greater than a first setting value or the yaw angular velocity prediction value is greater than a second setting value.

[0036] The present invention also provides a vehicle suspension system stabilizer bar simulation system.

[0037] Example

[0038] First, as Figure 1 As shown, an embodiment of the present invention provides a vehicle suspension system stabilizer bar simulation system, including a preview module for collecting data, a prediction module connected to the preview module, and a CDC (Continuous Damping Control) shock absorber connected to the prediction module, and the prediction module is configured to control the CDC shock absorber to output a damping force according to set conditions.

[0039] The function of CDC shock absorber is to prevent the vehicle body from excessive lateral roll when turning and keep the vehicle body balanced as much as possible. The purpose is to reduce the lateral roll of the vehicle and improve ride comfort.

[0040] Specifically, a CDC shock absorber is a shock absorber that can adjust the damping force in real time according to the vehicle state. The CDC shock absorber can achieve continuous adjustment of the damping force by changing the flow resistance of the internal fluid, thereby more accurately controlling the movement of the vehicle body. In an embodiment of the present invention, the dynamic adjustment capability of the CDC shock absorber is utilized to simulate the function of the stabilizer bar by accurately controlling the damping force without the need to add an additional physical stabilizer bar. This control system can automatically adjust the size and direction of the damping force according to different road conditions and driving modes, thereby effectively suppressing the roll of the vehicle body and ensuring that the function of the stabilizer bar of the automobile suspension system can be accurately simulated.

[0041] In an embodiment of the present invention, the preview module has the function of obtaining and processing road information in advance. The preview module senses and predicts the road conditions and dynamics of traffic participants in front of the vehicle in advance. The data collected by the preview module mainly includes information on the road surface, such as bumps and depressions on the road surface. It can obtain information about the road ahead, such as road curvature, obstacle locations, traffic signals, etc., by processing and analyzing sensor data, thereby providing a basis for subsequent decision-making and control of the vehicle. Without the preview module, all adjustments of the car will be delayed, and the rear axle must be adjusted after the front axle is impacted, or adjustments can be made after driving on a specific road for a period of time.

[0042] In the embodiment of the present invention, Figure 1 As shown in the figure, according to the preview module and the steering wheel angle signal, the prediction module calculates the Z-axis acceleration prediction value Z g And the yaw angular velocity prediction value Yaw. Z-axis acceleration prediction value Z g It refers to the acceleration of the vehicle in the vertical direction (usually up and down), reflecting the intensity of the vehicle's vertical movement. The predicted yaw rate Yaw refers to the angular velocity of the vehicle rotating around its vertical axis (usually the centerline of the vehicle), reflecting the degree of the vehicle's roll on the horizontal plane. By detecting and analyzing these parameters, the prediction module can determine the current motion state of the vehicle and predict possible future motion trends.

[0043] In the embodiment of the present invention, the prediction module makes a judgment based on the detected data to form a prediction result.

[0044] In the embodiment of the present invention, the setting condition includes that the Z-direction acceleration prediction value is greater than the first setting value Z 0 Or the yaw angular velocity is greater than the second set value Yaw 0 The first set value and the second set value are preset thresholds for determining whether the Z-axis acceleration and yaw angular velocity of the vehicle have reached a level at which the damping force needs to be adjusted.

[0045] like Figure 1 As shown, in the embodiment of the present invention, if the Z-axis acceleration prediction value is not greater than the first set value and the yaw angular velocity prediction value is not greater than the second set value, the prediction module controls the CDC shock absorber to output the corresponding damping force according to the prediction result.

[0046] In an embodiment of the present invention, the CDC shock absorber includes a control module, and the control module of the CDC shock absorber obtains an actual value of Z-direction acceleration, and the actual value of Z-direction acceleration is obtained by detecting a Z-direction acceleration sensor of the vehicle. Z-direction acceleration refers to the acceleration of the vehicle in the vertical direction (usually the up and down direction), reflecting the intensity of the vertical movement of the vehicle.

[0047] In the embodiment of the present invention, the control module of the CDC shock absorber obtains the actual value of the yaw rate, which is detected by the yaw rate sensor of the vehicle. The yaw rate refers to the angular velocity of the vehicle rotating around its vertical axis (usually the center line of the vehicle), reflecting the roll degree of the vehicle on the horizontal plane.

[0048] In an embodiment of the present invention, the control module of the CDC shock absorber obtains the actual value of the Z-direction acceleration from the Z-direction acceleration sensor of the vehicle in real time. At the same time, the CDC shock absorber also obtains the actual value of the yaw angular velocity in real time. The adjustment of the CDC shock absorber is based on the actual measured values ​​of the current Z-direction acceleration and yaw angular velocity. The CDC shock absorber will adjust its damping characteristics to achieve precise control of the vehicle suspension system. This design helps to improve the vehicle's handling, stability and ride comfort.

[0049] like Figure 1 As shown, in the embodiment of the present invention, when obtaining the actual values ​​of the Z-axis acceleration and the yaw angular velocity, if the Z-axis acceleration prediction value Z cannot be satisfied at the same time g ≤Z 0 (Vehicle defines the threshold value of vehicle vibration) and the yaw angular velocity prediction value Yaw≤Yaw 0 (Vehicle-defined lateral acceleration threshold), the control module adjusts the damping force output by the CDC shock absorber to achieve the role of simulating a stabilizer bar.

[0050] like Figure 1 As shown, the embodiment of the present invention mainly collects data through the preview module, which is equivalent to the information input end of the system. The preview module detects the Z-direction acceleration Z g (The vibration acceleration of the vehicle on the actual road surface) enables the system to receive road information and collect the yaw angular velocity Yaw (the lateral acceleration of the vehicle on the actual road surface) of the vehicle, and judge the vehicle's driving environment and driving status through the collected data.

[0051] 1. Judgment of the vehicle stabilizer bar simulation force being 0 (making the suspension truly fully independent and greatly improving the vehicle's comfort performance): When Z g ≤Z 0 (Vehicle defines the threshold value of vehicle vibration) and Yaw≤Yaw 0 (the vehicle-defined lateral acceleration threshold), the system determines that the vehicle is traveling on a very smooth road. At the same time, the driver does not make a large steering operation. The system outputs the corresponding damping force F=0 according to the predicted results, shielding the actual effect of the stabilizer bar, allowing the vehicle suspension to be completely independent, and the vehicle's comfort performance on a straight road can be greatly improved compared to the physical stabilizer bar parts.

[0052] 2. The simulated force of the vehicle stabilizer bar is not 0. Within the normal working range of the traditional shock absorber (normal working, achieving the function of the ordinary shock absorber): when Z g ≥Z 0 (Vehicle defines the threshold value of vehicle vibration) and Yaw≤Yaw 0(the threshold value of lateral acceleration defined by the vehicle), the system determines that the vehicle is driving on a rough road, and the driver does not make a large steering operation. The system outputs the corresponding damping force F=F1 (comfort performance adjustment) according to the predicted result. At this time, the force of F1 is the force that the adjustment engineer adjusts to meet the comfort performance according to the vehicle positioning and market demand. At this time, the CDC shock absorber simulation force works normally with the ordinary CDC suspension to provide the shock absorber damping force, realizing the vibration reduction effect of the vehicle on normal road conditions, thereby meeting the customer's requirements for vehicle comfort performance.

[0053] 3. The simulated force of the vehicle stabilizer bar is not 0, and it plays the role of the stabilizer bar force (in addition to providing normal shock absorber damping, it also simulates the stabilizer bar's anti-roll force to achieve controllable roll gradient and greatly improve vehicle operational stability): When Zg≤Z0 (the threshold value of vehicle vibration defined by the vehicle) and Yaw≥Yaw 0 (the threshold value of lateral acceleration defined by the vehicle), the system determines that the vehicle is driving on a rough road, and at the same time the driver makes a large steering operation to cause the vehicle to roll to a certain extent. The system outputs the corresponding damping force F=F2 (handling stability adjustment) according to the predicted result. At this time, the force of F2 is the force adjusted by the adjustment engineer according to the vehicle positioning and market demand to meet the handling stability performance. At this time, the CDC shock absorber simulation force works normally with the ordinary CDC suspension to provide shock absorber damping force, and can also simulate the vehicle anti-roll force provided by the traditional stabilizer bar, realizing the vibration reduction effect of the vehicle on normal roads and also realizing the vehicle's requirements for roll control under the handling stability action, thereby meeting the customer's requirements for vehicle handling stability performance.

[0054] The automobile suspension system stabilizer bar simulation system of the above structure has the following advantages:

[0055] 1. Use CDC shock absorbers to increase the stiffness range of CDC shock absorbers, so as to simulate the role of stabilizer bars under roll conditions, thereby eliminating the physical stabilizer bars to reduce the variables of suspension components. When facing the performance requirements of different models, only CDC shock absorbers are needed to meet the suspension stiffness requirements, increase chassis space layout, reduce suspension costs, reduce installation difficulties, reduce weight, and give precious space to other systems.

[0056] 2. The use of CDC shock absorbers can simplify the suspension structure and achieve performance requirements with fewer parts; the hardware types of parts (stabilizer bars, etc.) used in different models can be unified;

[0057] 3. The use of CDC shock absorber can make the suspension completely independent, without interference between the left and right sides;

[0058] 4. Realize real-time control of stiffness, thereby improving the performance of the suspension system;

[0059] 5. Traditional independent suspension cannot be considered completely independent in strict terms because of the presence of stabilizer bars. However, the stabilizer bar simulation system of the automobile suspension system of the embodiment of the present invention can simulate the effect of the stabilizer bar to zero on a flat road, thus truly achieving complete independence.

[0060] Second, as Figure 1 As shown, the embodiment of the present invention also provides a vehicle suspension system stabilizer bar simulation method, which adopts the vehicle suspension system stabilizer bar simulation system of the above structure and includes the following steps:

[0061] S1, preview module collects data;

[0062] S2, the prediction module performs collection and judgment;

[0063] S3, the prediction module controls the CDC shock absorber output damping force according to the set conditions.

[0064] The setting condition includes that the Z-axis acceleration prediction value is greater than a first setting value or the yaw angular velocity prediction value is greater than a second setting value.

[0065] In a third aspect, the present invention further provides a vehicle suspension system stabilizer bar simulation system including the above structure. The specific structure of the vehicle suspension system stabilizer bar simulation system can be referred to Figure 1 Since the vehicle of the present invention includes the automobile suspension system stabilizer bar simulation system in the above embodiment, it has all the advantages of the above automobile suspension system stabilizer bar simulation system.

[0066] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. Automobile suspension system stabilizer bar simulation system, characterized in that: It includes a preview module for collecting data, a prediction module connected to the preview module, and a CDC shock absorber connected to the prediction module. The prediction module is configured to control the output damping force of the CDC shock absorber according to set conditions.

2. The vehicle suspension system stabilizer bar simulation system according to claim 1, characterized in that: The prediction module is configured to obtain a Z-axis acceleration prediction value and a yaw angular velocity data prediction value.

3. The vehicle suspension system stabilizer bar simulation system according to claim 2, characterized in that: The prediction module makes judgments based on the detected data to form a prediction result.

4. The vehicle suspension system stabilizer bar simulation system according to claim 2, characterized in that: The setting condition includes that the Z-axis acceleration prediction value is greater than a first setting value or the yaw angular velocity prediction value is greater than a second setting value.

5. The vehicle suspension system stabilizer bar simulation system according to claim 4, characterized in that: The CDC shock absorber obtains the actual value of the Z-direction acceleration, and the actual value of the Z-direction acceleration is obtained by detecting the Z-direction acceleration sensor.

6. The vehicle suspension system stabilizer bar simulation system according to claim 4, characterized in that: The CDC shock absorber obtains an actual value of the yaw angular velocity, which is obtained by detecting the vehicle speed and the steering wheel angle.

7. The vehicle suspension system stabilizer bar simulation system according to any one of claims 4 to 6, characterized in that: If the Z-axis acceleration prediction value is not greater than the first set value and the yaw angular velocity prediction value is not greater than the second set value, the prediction module outputs a corresponding damping force according to the prediction result.

8. A method for simulating a stabilizer bar of an automobile suspension system, characterized in that: The vehicle suspension system stabilizer bar simulation system according to any one of claims 1 to 7 is adopted, and comprises: The preview module collects data; The prediction module performs collection and judgment; The prediction module controls the CDC shock absorber to output a damping force according to a set condition.

9. The method for simulating a stabilizer bar of a vehicle suspension system according to claim 8, characterized in that: The setting condition includes that the Z-axis acceleration prediction value is greater than a first setting value or the yaw angular velocity prediction value is greater than a second setting value.

10. A vehicle, characterized in that: The invention comprises the automobile suspension system stabilizer bar simulation system as described in any one of claims 1 to 7.

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