A passenger car air suspension multi-mode decision and switching system, method and computer system

Abstract

The application discloses a kind of passenger car air suspension multi-mode decision and switching system, utilize vehicle-mounted sensor and the relevant signal that online obtains reflecting vehicle actual operating condition with computing platform, signal is sent to data preprocessing module;Data preprocessing module will input multi-dimensional information be time synchronization and data setting after, send to air suspension mode decision module;Air suspension mode decision module is based on the multi-mode switching rule made, according to driver style information, vehicle speed information, road surface type information and road curvature information determine air suspension system should work in the best body height and damper mode;Air suspension mode switching module, according to the decision result of air suspension mode decision module, automatically switch the working mode of air suspension system.The advantage of the present application is to improve the accuracy, safety and flexibility of air suspension mode decision under different traffic environment and driver conditions.

Description

Technical Field

[0001] This invention relates to the field of air suspension for passenger vehicles, and particularly to a multi-mode decision-making and switching system and method for air suspension in passenger vehicles, as well as a computer system. Background Technology

[0002] Air suspension not only boasts excellent damping performance but also actively adjusts vehicle height and shock absorber damping based on driving conditions, enhancing ride comfort and handling stability. For example, at high speeds on straight roads, appropriately lowering the vehicle height and shock absorber damping improves stability while reducing wind resistance and fuel consumption. When cornering, lowering the vehicle height reduces body roll, while appropriately increasing shock absorber damping effectively suppresses body roll, thus improving handling stability. On challenging road conditions, such as flooded, damaged, or gravelly surfaces, raising the vehicle height increases ground clearance, improving ground clearance, while moderately reducing shock absorber damping enhances the suspension's ability to absorb bumps, improving both comfort and stability.

[0003] However, current research on air suspension systems often overlooks the issue of coordinated control between vehicle height and damping during the control process, making it difficult to meet the control performance requirements of air suspension systems under a wide range of driving conditions. Furthermore, it fails to adequately consider the impact of driver style and other factors on air suspension mode decisions, thus failing to meet the personalized comfort and handling needs of drivers with different driving styles.

[0004] Therefore, it is particularly important to develop an air suspension mode decision-making system that can improve vehicle passability, handling stability, and economy under different traffic environments, while fully considering the individual preferences of various drivers. This is the focus of this application. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a multi-mode decision-making and switching system and method for air suspension of passenger vehicles and a computer system, so as to improve the accuracy, safety and flexibility of air suspension mode decision-making under different traffic environments and driver conditions.

[0006] To address the above problems, this invention provides a multi-mode decision-making and switching system for passenger vehicle air suspension, comprising:

[0007] The data preprocessing module receives multi-dimensional signals reflecting the actual operating status of the vehicle from the on-board sensors and the on-board computing platform, performs time synchronization and data adjustment, and then sends them to the air suspension mode decision module.

[0008] The air suspension mode decision module receives data sent by the data preprocessing module, formulates multi-mode switching rules, and determines the optimal vehicle height suspension module and shock absorber damping suspension mode of the air suspension system based on driver style information, vehicle speed information, road surface type information and road curvature information.

[0009] The air suspension mode switching module automatically switches the operating mode of the air suspension system based on the decision results of the air suspension mode decision module.

[0010] This invention defines the air suspension modes as "vehicle height suspension mode" and "damper damping suspension mode". The "vehicle height suspension mode" is divided into three modes: "low", "medium" and "high" according to the vehicle height. The "damper damping suspension mode" is divided into three modes: "comfort", "balance" and "sport" according to the damper damping stiffness.

[0011] The driver style information refers to the driver style type identified by the driver style recognition model over a period of time, including three style types: "conservative", "average" and "aggressive".

[0012] The road surface type information is the result of machine vision recognition algorithm identification, and is divided into "conventional (dry and flat) road surface", "wet and slippery (water, snow and ice) road surface" and "special (bumpy and undulating) road surface". The road curvature is the curvature result of the road in front of the vehicle predicted by the machine vision recognition algorithm, and is divided into small curvature roads and large curvature roads according to the curvature magnitude.

[0013] The vehicle speed signal is the longitudinal vehicle speed result collected by the on-board sensor, and is divided into three types: "low speed", "medium speed" and "high speed".

[0014] This invention provides a method for a multi-mode decision-making and switching system for air suspension in passenger vehicles, comprising the following steps:

[0015] Step S1: During the operation of the passenger vehicle, the vehicle sensors and the vehicle computing platform acquire time-series data information reflecting the traffic environment, the actual operating status of the vehicle and the driver's behavior, including driver style, longitudinal speed, road curvature and road surface type.

[0016] Step S2: Synchronize the time and frequency of the data based on the acquired time series data information;

[0017] The multi-dimensional input data from different sources are aligned according to their timestamps, and all input data are adjusted to a standard frequency so that the multi-dimensional data at the same point in time reflects the real state of the vehicle and its environment at the same moment.

[0018] Step S3: Adjust the time-synchronized data information;

[0019] Data tuning is the process of converting raw physical quantities or state information into a discrete numerical format that the system can recognize and process, in order to adapt to the needs of subsequent logical judgment models.

[0020] Step S4: Develop the air suspension mode switching rules to describe the optimal vehicle height and shock absorber damping mode that the system should operate at under different driving styles, vehicle speeds, road surface types, and road curvatures.

[0021] Step S5: Establish a multi-mode decision system for the air suspension system according to the switching rules described in Step S4, and make logical judgments based on the multi-dimensional input information after data preprocessing in Step S3 to achieve the instant selection of the optimal air suspension mode under different driving scenarios.

[0022] Step S6: Automatically switch the working mode of the air suspension system based on the air suspension mode decision result described in step S5;

[0023] To prevent frequent switching of air suspension modes, a duration threshold of 3 ± 0.5 seconds is set. If the target air suspension mode is inconsistent with the current system operating mode and the duration exceeds the threshold, the system switches to the target air suspension mode; otherwise, it maintains the current operating mode.

[0024] The present invention provides a computer system including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method for a passenger vehicle air suspension multi-mode decision and switching system.

[0025] The beneficial effects of this invention are as follows:

[0026] 1) An air suspension mode decision-making and switching system and method that takes into account factors such as different driver styles and road surface types, divides the air suspension control process into coordinated control of vehicle height and shock absorber damping, so as to ensure that under different road conditions, the vehicle performance is guaranteed while still meeting the personalized preferences of various drivers for comfort and handling.

[0027] 2) Improve the accuracy, safety, and flexibility of air suspension mode decision-making under different traffic environments and driver conditions. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the passenger vehicle air suspension system mode decision system and method described in this invention;

[0029] Figure 2 This is a joint simulation model of the passenger vehicle air suspension system mode decision system described in this invention;

[0030] Figures 3(a), (b), and (c) are Figure 2The input information of the joint simulation model of the decision system;

[0031] Figures 4(a) and (b) show the decision output results of the co-simulation model described in this invention under the condition of conservative driver style type;

[0032] Figures 5(a) and (b) show the decision output results of the co-simulation model described in this invention under the condition of normal driver style type;

[0033] Figures 6(a) and (b) show the decision output results of the co-simulation model described in this invention under the condition of aggressive driver style type. Detailed Implementation

[0034] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0035] This invention provides a multi-mode decision-making and switching system for passenger vehicle air suspension, comprising:

[0036] The data preprocessing module receives multi-dimensional signals reflecting the actual operating status of the vehicle from the on-board sensors and the on-board computing platform, performs time synchronization and data adjustment, and then sends them to the air suspension mode decision module.

[0037] The air suspension mode decision module receives data sent by the data preprocessing module, formulates multi-mode switching rules, and determines the optimal vehicle height suspension module and shock absorber damping suspension mode of the air suspension system based on driver style information, vehicle speed information, road surface type information and road curvature information.

[0038] The air suspension mode switching module automatically switches the operating mode of the air suspension system based on the decision results of the air suspension mode decision module.

[0039] like Figure 1 As shown, the present invention provides a method for a multi-mode decision-making and switching system for air suspension in passenger vehicles, comprising the following steps:

[0040] Step S1: Obtain the vehicle's longitudinal speed through the CAN communication mechanism of the onboard sensors. The current driver's style type is obtained through the topic communication mechanism of the ROS (Robotics Operating System) on the in-vehicle computing platform. The curvature of the road in front of the vehicle With road surface type The aforementioned data also includes timestamp records for each data point, forming the foundational data support for subsequent data processing and pattern decision-making tasks;

[0041] Step S2: Process the raw data as follows:

[0042] Step S21: Time synchronization;

[0043] Aligning data from different sources according to their timestamps allows multi-dimensional data at the same point in time to reflect the true state of vehicles and their environment at the same moment.

[0044] Step S22: Frequency synchronization;

[0045] Considering practical engineering needs, this specific embodiment of the invention sets all input data to be adjusted to a standard frequency of 10Hz. When the original sampling frequency of the data source is detected to be different from 10Hz, frequency alignment is performed on these data according to preset rules. Specifically, for data streams below 10Hz, linear interpolation is used to fit the data points to increase the frequency to 10Hz; while for data streams above 10Hz, redundant data points are selectively removed to reduce the frequency to 10Hz.

[0046] Step S23: Data tuning;

[0047] The data is converted into a discrete numerical format that the system can recognize and process. The relationship between the actual input and system input of the air suspension system mode decision system in a specific embodiment of the present invention is shown in Table 1, and the relationship between the decision system output and the actual output is shown in Table 2.

[0048] Table 1: Relationship between Actual Input and System Input of the Air Suspension System Mode Decision System

[0049]

[0050] Table 2: Relationship between System Output and Actual Output of Air Suspension System Mode Decision System

[0051]

[0052] Step S3: Establish the air suspension mode switching rules as shown in Table 3. It's worth noting that on slippery roads, passenger vehicle grip is significantly reduced, increasing the risk of skidding and loss of control. Ensuring vehicle safety and stability becomes paramount. Similarly, for uneven and bumpy road surfaces, to maintain vehicle stability and ride comfort, the air suspension needs to respond quickly to absorb vibrations and maintain vehicle level. In this case, the optimal suspension mode should maximize shock absorption and maintain vehicle stability. The choice of suspension mode in this situation does not depend on the driver's personal driving style.

[0053] Table 3: Rules for switching air suspension modes

[0054]

[0055] Step S4: Establish a multi-mode decision-making system for the air suspension system, and realize the real-time selection of the optimal air suspension mode under different driving scenarios based on the multi-dimensional input data after data processing in step S2;

[0056] Step S5: Automatically switch the working mode of the air suspension system according to the air suspension mode decision result described in step S4. To prevent frequent switching of the air suspension mode, set the duration threshold to 3 seconds.

[0057] If the target air suspension mode is inconsistent with the current system operating mode and the duration exceeds the threshold, the system will switch to the target air suspension mode; otherwise, the current operating mode will remain unchanged.

[0058] like Figure 1 The flowchart shown is a method flowchart for a multi-mode decision-making and switching system for passenger vehicle air suspension provided by the present invention; as shown... Figure 2 As shown, a co-simulation model of the passenger vehicle air suspension system mode decision system was built based on Carsim / Simulink / Stateflow. The vehicle model, built using Carsim software, provides longitudinal vehicle speed information to the co-simulation model. The road model provides information on road curvature and surface type ahead of the vehicle. The driver model provides driver style information. The co-simulation time was set to 300 seconds. The inputs to the co-simulation model are shown in Figures 3(a), (b), and (c), including time-varying surface type, road curvature, and vehicle speed. Driver style is the fourth dimension input. When the driver style is conservative, the outputs of the co-simulation model, including the height suspension mode and damping suspension mode, are shown in Figures 4(a) and (b). When the driver style is normal, the outputs of the co-simulation model, including the height suspension mode and damping suspension mode, are shown in Figures 5(a) and (b). When the driver style is aggressive, the outputs of the co-simulation model, including the height suspension mode and damping suspension mode, are shown in Figures 6(a) and (b). In summary, the multi-mode decision-making system for passenger vehicle air suspension accurately switches suspension modes based on the corresponding input signals, and different driver styles have a significant impact on the decision output.

[0059] The present invention provides a computer system including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method for a passenger vehicle air suspension multi-mode decision and switching system.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for a multi-mode decision-making and switching system for air suspension in passenger vehicles, characterized in that, The system includes: The data preprocessing module receives multi-dimensional signals reflecting the actual operating status of the vehicle from the on-board sensors and the on-board computing platform, performs time synchronization and data adjustment, and then sends them to the air suspension mode decision module. The air suspension mode decision module receives data sent by the data preprocessing module, formulates multi-mode switching rules, and determines the optimal vehicle height suspension mode and shock absorber damping suspension mode of the air suspension system based on driver style information, vehicle speed information, road surface type information and road curvature information. The air suspension mode switching module automatically switches the working mode of the air suspension system based on the decision results of the air suspension mode decision module. The method includes the following steps: Step S1: During the operation of the passenger vehicle, the vehicle sensors and the vehicle computing platform acquire time-series data information reflecting the traffic environment, the actual operating status of the vehicle and the driver's behavior. Step S2: Perform time and frequency synchronization on the timing data. The multi-dimensional input data from different sources are aligned according to their timestamps, and all input data are adjusted to a standard frequency so that the multi-dimensional data at the same point in time reflects the real state of the vehicle and its environment at the same moment. Step S3: Adjust the time-synchronized data information; Data tuning is the process of converting raw physical quantities or state information into a discrete numerical format that the system can recognize and process. Step S4: Define the rules for switching air suspension modes; Step S5: Establish a multi-mode decision system for the air suspension system based on the air suspension mode switching rules described in Step S4. Make logical judgments based on the multi-dimensional input information after data preprocessing in Step S3 to achieve the instant selection of the optimal air suspension mode under different driving scenarios. Step S6: Automatically switch the working mode of the air suspension system according to the air suspension mode decision result described in step S5.

2. The method of the passenger vehicle air suspension multi-mode decision-making and switching system according to claim 1, characterized in that: The time-series data information in step S1 includes driver style, longitudinal vehicle speed, road curvature, and road surface type.

3. The method for multi-mode decision-making and switching system of passenger vehicle air suspension according to claim 1, characterized in that: In step S6, the duration threshold is set to 3 ± 0.5 seconds. If the target air suspension mode is inconsistent with the current system working mode and the duration exceeds the threshold, the system switches to the target air suspension mode; otherwise, the current working mode is maintained.

4. A computer system comprising a memory, a processor, and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method according to any one of claims 1-3.

Images