Systems and methods for improving vehicle crosswind resistance using active stabilizer bars

Abstract

The present invention discloses a system and method for improving a vehicle's crosswind resistance through an active stabilizer bar. The adaptive cruise control system is used to measure the longitudinal distance, lateral distance, relative speed, and real-time speed of the vehicle and the oncoming vehicle, and calculate the time of meeting based on the relative speed and longitudinal distance between the vehicle and the oncoming vehicle; calculate the time period of meeting based on the real-time speed of the vehicle and the relative speed between the vehicle and the oncoming vehicle; calculate the torsional torque value required for the stabilizer bar during the meeting based on the relative speed, lateral distance, and maximum speed of the vehicle and the oncoming vehicle; and control the torsional torque of the stabilizer bar during the meeting process based on the meeting time, meeting time, and required torsional torque value. The present invention can automatically measure the meeting time and relative speed, adjust the relative position of the active stabilizer bar in advance, and increase the torsional stiffness preload to reduce the interference of crosswind on vehicle body roll during the meeting.

Description

Technical Field

[0001] This invention relates to the field of automotive suspension control, specifically to a system and method for improving a vehicle's resistance to crosswinds through an active stabilizer bar. Background Technology

[0002] An active stabilizer bar is an auxiliary elastic element in a car's suspension, positioned transversely at the front and rear of the vehicle. It prevents excessive lateral roll during cornering, reduces body roll, improves ride comfort, and helps control vehicle attitude and reduce road impact. Adaptive cruise control is a basic driver assistance system that utilizes various sensors on the vehicle to continuously perceive and collect data about the surrounding environment while the car is in motion.

[0003] Currently, there is no method to control the body roll caused by wind. Therefore, when two vehicles meet during driving, the greater the speed difference, the greater the impact of the airflow on the vehicle's stability, causing the vehicle to roll and reducing driver confidence. Summary of the Invention

[0004] The purpose of this invention is to provide a system and method for improving a vehicle's crosswind resistance through active stabilizer bars. This method utilizes the vehicle's existing configuration to pre-adjust the relative positions of the active stabilizer bars, increasing torsional stiffness preload and enhancing vehicle stability during oncoming traffic, without increasing costs.

[0005] To achieve this objective, the present invention provides a system for improving a vehicle's crosswind resistance through an active stabilizer bar, which includes an adaptive cruise control system and an active lateral stabilizer bar control module;

[0006] The adaptive cruise control system is used to measure the longitudinal and lateral distances between the vehicle and oncoming vehicles, the vehicle's real-time speed, and the relative speed between the vehicle and oncoming vehicles. It calculates the meeting time based on the relative speed and longitudinal distance between the vehicle and oncoming vehicles, and calculates the meeting time period based on the vehicle's real-time speed and the relative speed between the vehicle and oncoming vehicles.

[0007] The active lateral stabilizer bar control module is used to calculate the torsional moment value required for the lateral stabilizer bar during oncoming traffic based on the relative speed between the vehicle and the oncoming vehicle, the lateral distance between the vehicle and the oncoming vehicle, and the maximum speed of the vehicle.

[0008] The active lateral stabilizer control module is also used to control the torsional torque of the lateral stabilizer during the passing process based on the passing time, the passing time period, and the torsional torque value required by the lateral stabilizer during the passing.

[0009] Furthermore, the meeting process includes the meeting time T, the time period before meeting T1, the time period before meeting T2, and the time period after meeting T3.

[0010] Furthermore, the meeting time T is calculated using the following formula based on the longitudinal distance between the vehicle and the oncoming vehicle and their relative speed:

[0011] T = L / V1;

[0012] Where L is the longitudinal distance between the vehicle and the oncoming vehicle, and V1 is the relative speed between the vehicle and the oncoming vehicle.

[0013] Furthermore, the specific method for controlling the torsional moment of the lateral stabilizer bar during the passing process based on the required torsional moment value is as follows:

[0014] Before the oncoming vehicle passes, the active stabilizer bar control module increases the torsional torque of the stabilizer bar during the T1 time period. At the moment of passing the oncoming vehicle, it increases the torsional torque to the value required for passing the vehicle. During the T2 time period, it maintains the torsional torque value required for passing the vehicle. During the T3 time period after passing the vehicle passes, it reduces the torsional torque of the stabilizer bar. After the T3 time period, the torsional torque of the stabilizer bar returns to the torsional torque when the vehicle is in normal driving condition.

[0015] Furthermore, the specific calculation method for the time period T1 before the meeting is as follows: T1 = T S +K / V k ,

[0016] Among them, T S For the response time of the torsional torque change controlled by the active lateral stabilizer bar, V k K represents the response speed of the torsional torque change controlled by the active lateral stabilizer bar, where K is the required torsional torque value of the lateral stabilizer bar during vehicle encounter.

[0017] Furthermore, the method for calculating the meeting time period T2 is as follows:

[0018] T2 = V1C1 + V2C2,

[0019] Wherein, C1 is the first standard quantity, C2 is the second standard quantity, V1 is the relative speed between this vehicle and oncoming vehicles, and V2 is the real-time speed of this vehicle.

[0020] Furthermore, the required torsional moment value of the lateral stabilizer bar during the collision is calculated as follows:

[0021] K = V1C3 / V X +C4 / L2;

[0022] Where C3 is the third standard quantitation, C4 is the fourth standard quantitation, and V XV1 is the maximum speed of this vehicle, V2 is the relative speed between this vehicle and the oncoming vehicle, L2 is the lateral distance between this vehicle and the oncoming vehicle, and K is the torsional moment value required by the stabilizer bar during oncoming traffic.

[0023] Furthermore, the time period T3 after the meeting is determined by the response time of the change in the torsional torque controlled by the active lateral stabilizer bar, the response speed of the change in the torsional torque controlled by the active lateral stabilizer bar, and the torsional torque value required during the meeting of the lateral stabilizer bars.

[0024] The method for improving a vehicle's crosswind resistance based on the above-mentioned system that enhances crosswind resistance through active stabilizer bars includes the following steps:

[0025] Calculate the longitudinal and lateral distances between the vehicle and oncoming vehicles, the vehicle's real-time speed, and the relative speed between the vehicle and oncoming vehicles. Calculate the meeting time based on the relative speed and longitudinal distance between the vehicle and oncoming vehicles. Calculate the meeting time period based on the vehicle's real-time speed and the relative speed between the vehicle and oncoming vehicles.

[0026] Calculate the required torsional moment value of the stabilizer bar during oncoming traffic based on the relative speed between the vehicle and the oncoming vehicle, the lateral distance between the vehicle and the oncoming vehicle, and the maximum speed of the vehicle.

[0027] Based on the meeting time, the meeting period, and the required torsional torque value of the stabilizer bar during the meeting process, the torsional torque of the stabilizer bar is controlled.

[0028] The beneficial effects of this invention are as follows: When vehicles meet, the greater the speed difference, the greater the impact of the airflow on vehicle stability, causing body roll and reducing driver confidence. For vehicles equipped with active stabilizer bars and adaptive cruise control systems, the adaptive cruise control system calculates the meeting time and relative speed before the vehicles meet, adjusting the relative position of the active stabilizer bars in advance to increase torsional stiffness preload and reduce the interference of crosswinds on body roll during oncoming traffic. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention;

[0030] Figure 2 This is a time and torsional torque curve for the present invention. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0032] A specific embodiment of the system designed in this invention for improving a car's crosswind resistance through an active stabilizer bar:

[0033] Example 1

[0034] like Figure 1 The diagram illustrates a system for improving a vehicle's resistance to crosswinds using an active stabilizer bar, which includes an adaptive cruise control system and an active lateral stabilizer bar control module.

[0035] The adaptive cruise control system is used to measure the longitudinal and lateral distances between the vehicle and oncoming vehicles, the vehicle's real-time speed, and the relative speed between the vehicle and oncoming vehicles. It calculates the meeting time based on the relative speed and longitudinal distance between the vehicle and oncoming vehicles, and calculates the meeting time period based on the vehicle's real-time speed and the relative speed between the vehicle and oncoming vehicles.

[0036] The active lateral stabilizer bar control module is used to calculate the torsional moment value required for the lateral stabilizer bar during oncoming traffic based on the relative speed between the vehicle and the oncoming vehicle, the lateral distance between the vehicle and the oncoming vehicle, and the maximum speed of the vehicle.

[0037] The active lateral stabilizer control module is also used to control the torsional torque of the lateral stabilizer during the passing process based on the passing time, the passing time period, and the torsional torque value required by the lateral stabilizer during the passing.

[0038] In the above technical solution, the meeting process includes the meeting time T, the time period before the meeting T1, the time period before the meeting T2, and the time period after the meeting T3. For example... Figure 2 As shown, at the meeting time T, the vehicle and the oncoming vehicle begin to meet, and the meeting ends at the intersection of the meeting time period T2 and the post-meeting time period T3.

[0039] In the above technical solution, the meeting time T is calculated based on the longitudinal distance between the vehicle and the oncoming vehicle and the relative speed between the vehicle and the oncoming vehicle using the following formula:

[0040] T = L / V1;

[0041] Where L is the longitudinal distance between the vehicle and the oncoming vehicle, and V1 is the relative speed between the vehicle and the oncoming vehicle.

[0042] In the above technical solution, the specific method for controlling the torsional moment of the lateral stabilizer bar during the passing process, based on the required torsional moment value, is as follows:

[0043] like Figure 2As shown, during the time period T1 before the oncoming vehicle passes, the active lateral stabilizer control module increases the torsional torque of the lateral stabilizer by changing the relative position of the active lateral stabilizer. At the moment of passing the oncoming vehicle T, the torsional torque is increased to the value required for the active lateral stabilizer during the oncoming vehicle pass. During the time period T2 after the oncoming vehicle passes, the torsional torque of the lateral stabilizer is reduced, and during the time period T3 after the oncoming vehicle passes, the torsional torque of the lateral stabilizer returns to the value required for the vehicle's normal driving.

[0044] During the oncoming traffic period T2, when the vehicle and the oncoming vehicle are in the oncoming traffic phase, the greater the speed difference between the two vehicles, the greater the impact of the airflow generated during the oncoming traffic on the vehicle's stability, and the more likely the vehicle will roll. Therefore, during the oncoming traffic period T2, the active anti-roll bar maintains the required torsional moment value for oncoming traffic to reduce the interference of crosswinds on the vehicle's roll.

[0045] In the above technical solution, the specific calculation method for the time period T1 before the meeting of vehicles is: T1 = T S +K / V k ,

[0046] Among them, T S For the response time of the torsional torque change controlled by the active lateral stabilizer bar, V k K represents the response speed of the active stabilizer bar torsional torque change, where K is the required torsional torque value during the encounter. The change in torsional torque controlled by the active stabilizer bar is not abrupt but requires a certain response time. The time period T1 before the encounter is the response time for the active stabilizer bar to increase its torsional torque value to the required torsional torque value during the encounter.

[0047] In the above technical solution, the calculation method for the meeting time period T2 is as follows:

[0048] T2 = V1C1 + V2C2,

[0049] Wherein, C1 is the first calibration value, and C2 is the second calibration value. The calibration values ​​are determined by repeatedly simulating oncoming traffic conditions at the test site and based on subjective evaluation. Generally, C1 is set to 0.005, and C2 to 0.003. V1 is the relative speed between the vehicle and the oncoming vehicle, and V2 is the real-time speed of the vehicle. The length of the oncoming traffic time interval T2 is related to the speed of both the vehicle and the oncoming vehicle. When the speeds of both change, the oncoming traffic time interval T2 will inevitably change. However, the degree of influence of the speeds of the vehicle and the oncoming vehicle on the oncoming traffic time interval is different. Therefore, the first calibration value C1 and the second calibration value C2 are directly proportional parameters reflecting the degree of influence of the speeds of both vehicles on the oncoming traffic time interval T2.

[0050] In the above technical solution, the required torsional moment value of the lateral stabilizer bar during the collision is calculated as follows:

[0051] K = V1C3 / V X +C4 / L2;

[0052] C3 is the third calibration value, and C4 is the fourth calibration value. The calibration values ​​are determined in the test field by repeatedly simulating the passing conditions and based on subjective evaluation. Generally, C3 is set to 200, and C4 to 400. (V) X V1 is the maximum speed of this vehicle, which is a fixed value determined by the vehicle's factory specifications. V2 is the relative speed between this vehicle and the oncoming vehicle. L2 is the lateral distance between this vehicle and the oncoming vehicle. K is the torsional moment required by the stabilizer bar during oncoming traffic.

[0053] During driving, the higher the relative speed between the vehicle and oncoming vehicles, the greater the required torsional moment of the stabilizer bar during the passing maneuver. Similarly, the closer the lateral distance between the vehicle and oncoming vehicles, the greater the required torsional moment of the stabilizer bar during the passing maneuver. Both the relative speed and lateral distance between the vehicle and oncoming vehicles affect the vehicle's stability during passing maneuvers, but the degree of influence varies depending on the specific passing situation and environment. Therefore, the third calibration value C3 and the fourth calibration value C4 are directly proportional parameters that reflect the degree of influence of the relative speed and lateral distance between the vehicle and oncoming vehicles on the vehicle's stability during passing maneuvers. These parameters need to be subjectively calibrated at the test site. If the third calibration value C3 and the fourth calibration value C4 are properly calibrated, they can even completely offset the interference of crosswinds on the vehicle's roll during passing maneuvers.

[0054] In the above technical solution, the time period T3 after the meeting is determined by the response time of the change in the torsional torque controlled by the active lateral stabilizer bar, the response speed of the change in the torsional torque controlled by the active lateral stabilizer bar, and the torsional torque value required by the lateral stabilizer bar during the meeting.

[0055] Example 2

[0056] A specific embodiment of the method for improving the crosswind resistance of a vehicle based on the above-mentioned system for improving the crosswind resistance of a vehicle through an active stabilizer bar includes the following steps:

[0057] Calculate the longitudinal and lateral distances between the vehicle and oncoming vehicles, the vehicle's real-time speed, and the relative speed between the vehicle and oncoming vehicles. Calculate the meeting time based on the relative speed and longitudinal distance between the vehicle and oncoming vehicles. Calculate the meeting time period based on the vehicle's real-time speed and the relative speed between the vehicle and oncoming vehicles.

[0058] Calculate the required torsional moment value of the stabilizer bar during oncoming traffic based on the relative speed between the vehicle and the oncoming vehicle, the lateral distance between the vehicle and the oncoming vehicle, and the maximum speed of the vehicle.

[0059] Based on the meeting time, the meeting period, and the required torsional torque value of the stabilizer bar during the meeting process, the torsional torque of the stabilizer bar is controlled.

[0060] Example 3

[0061] The present invention also includes a computer program product comprising a computer program / instructions that, when executed by a processor, implement the steps of the method described above for improving the vehicle's resistance to crosswinds.

[0062] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A system for improving a vehicle's crosswind resistance through an active stabilizer bar, comprising an adaptive cruise control system and an active lateral stabilizer bar control module; The adaptive cruise control system is used to measure the longitudinal and lateral distances between the vehicle and oncoming vehicles, the vehicle's real-time speed, and the relative speed between the vehicle and oncoming vehicles. It calculates the meeting time based on the relative speed and longitudinal distance between the vehicle and oncoming vehicles, and calculates the meeting time period based on the vehicle's real-time speed and the relative speed between the vehicle and oncoming vehicles. The active lateral stabilizer bar control module is used to calculate the torsional moment value required for the lateral stabilizer bar during oncoming traffic based on the relative speed between the vehicle and the oncoming vehicle, the lateral distance between the vehicle and the oncoming vehicle, and the maximum speed of the vehicle. The active lateral stabilizer control module is also used to control the torsional torque of the lateral stabilizer during the passing process based on the passing time, the passing time period, and the torsional torque value required by the lateral stabilizer during the passing.

2. The system for improving a vehicle's crosswind resistance via an active stabilizer bar according to claim 1, characterized in that: The meeting process includes the meeting time T, the time period before the meeting T1, the time period before the meeting T2, and the time period after the meeting T3.

3. In the system for improving a vehicle's crosswind resistance via an active stabilizer bar according to claim 2, the meeting time T is calculated using the following formula based on the longitudinal distance between the vehicle and the oncoming vehicle and their relative speed: T = L / V1; in, L is the longitudinal distance between the vehicle and the oncoming vehicle, and V1 is the relative speed between the vehicle and the oncoming vehicle.

4. The system for improving a vehicle's crosswind resistance via an active stabilizer bar according to claim 2, characterized in that: The specific method for controlling the torsional moment of the stabilizer bar during passing, based on the required torsional moment value, is as follows: Before the oncoming vehicle passes, the active stabilizer bar control module increases the torsional torque of the stabilizer bar during the T1 time period. At the moment of passing the oncoming vehicle, it increases the torsional torque to the value required for passing the vehicle. During the T2 time period, it maintains the torsional torque value required for passing the vehicle. During the T3 time period after passing the vehicle passes, it reduces the torsional torque of the stabilizer bar. After the T3 time period, the torsional torque of the stabilizer bar returns to the torsional torque when the vehicle is in normal driving condition.

5. The system for improving a vehicle's crosswind resistance via an active stabilizer bar according to any one of claims 2 to 4, characterized in that: The specific calculation method for the time period T1 before the meeting of vehicles is as follows: T1 = T S +K / V k , Among them, T S For the response time of the torsional torque change controlled by the active lateral stabilizer bar, V k K represents the response speed of the torsional torque change controlled by the active lateral stabilizer bar, where K is the required torsional torque value of the lateral stabilizer bar during vehicle encounter.

6. The system for improving a vehicle's crosswind resistance via an active stabilizer bar according to any one of claims 2 to 4, characterized in that: The calculation method for the meeting time period T2 is as follows: T2 = V1C1 + V2C2, Wherein, C1 is the first standard quantity, C2 is the second standard quantity, V1 is the relative speed between this vehicle and oncoming vehicles, and V2 is the real-time speed of this vehicle.

7. The system for improving a vehicle's crosswind resistance via an active stabilizer bar according to any one of claims 1 to 4, characterized in that: The required torsional moment value of the lateral stabilizer bar during passing is calculated as follows: K=V1C3 / V X +C4 / L2; Where C3 is the third standard quantitation, C4 is the fourth standard quantitation, and V X V1 is the maximum speed of this vehicle, L2 is the relative speed between this vehicle and the oncoming vehicle, K is the torsional moment required by the stabilizer bar during oncoming traffic.

8. The system for improving a vehicle's crosswind resistance via an active stabilizer bar according to claim 2, characterized in that: The time period T3 after the meeting is determined by the response time of the change in the torsional torque controlled by the active lateral stabilizer bar, the response speed of the change in the torsional torque controlled by the active lateral stabilizer bar, and the torsional torque value required during the meeting of the lateral stabilizer bars.

9. A method for improving the crosswind resistance of a vehicle based on the system for improving crosswind resistance of a vehicle through an active stabilizer bar as described in any one of claims 1-8, characterized in that, Includes the following steps: Calculate the longitudinal and lateral distances between the vehicle and oncoming vehicles, the vehicle's real-time speed, and the relative speed between the vehicle and oncoming vehicles. Calculate the meeting time based on the relative speed and longitudinal distance between the vehicle and oncoming vehicles. Calculate the meeting time period based on the vehicle's real-time speed and the relative speed between the vehicle and oncoming vehicles. Calculate the required torsional moment value of the stabilizer bar during oncoming traffic based on the relative speed between the vehicle and the oncoming vehicle, the lateral distance between the vehicle and the oncoming vehicle, and the maximum speed of the vehicle. Based on the meeting time, the meeting period, and the required torsional torque value of the stabilizer bar during the meeting process, the torsional torque of the stabilizer bar is controlled.

10. A computer program product comprising a computer program / instructions that, when executed by a processor, implement the steps of the method described in claim 9.

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