System and method for improving crosswind resistance of automobile through active stabilizer bar

Abstract

The invention discloses a system and method for improving the crosswind resistance of an automobile through an active stabilizer bar. A self-adaptive cruise system is used for measuring and calculating the longitudinal distance, the transverse distance, the relative speed and the real-time speed of the automobile between the automobile and a meeting automobile; the meeting time is calculated according to the relative vehicle speed and the longitudinal distance between the vehicle and the meeting vehicle; calculating a meeting time period according to the real-time speed of the vehicle and the relative speed of the vehicle and the meeting vehicle; and according to the relative vehicle speed and the transverse distance of the vehicle and the meeting vehicle and the maximum vehicle speed of the vehicle, the torsional moment value needed in the meeting of the transverse stabilizer bar is calculated, and according to the meeting moment, the meeting time period and the torsional moment value needed in the meeting, the torsional moment of the transverse stabilizer bar is controlled in the meeting process. According to the method, the meeting time and the relative vehicle speed can be automatically calculated, the relative position of the active transverse stabilizer bar is adjusted in advance, the torsional rigidity preload is improved, and interference of crosswind on vehicle body rolling during meeting is reduced.

Description

Technical Field

[0001] The invention relates to the field of automobile suspension control, and in particular to a system and method for improving the crosswind resistance of an automobile through an active stabilizer bar. Background Art

[0002] Active lateral stabilizer bar is an auxiliary elastic element in the automobile suspension, which is placed horizontally at the front and rear ends of the automobile to prevent the vehicle body from excessive lateral roll when turning, reduce the degree of lateral roll of the vehicle and improve ride comfort, and play a role in controlling the vehicle body posture and reducing road impact. The adaptive cruise system is a primary auxiliary driving system, which uses various sensors on the vehicle to sense the surrounding environment and collect data at any time during the driving process of the car.

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

[0004] The purpose of the present invention is to provide a system and method for improving the crosswind resistance of a vehicle through an active stabilizer bar. The method uses the existing configuration of the vehicle to adjust the relative position of the active lateral stabilizer bar in advance, increase the torsional rigidity preload, and improve the vehicle stability when meeting other vehicles without increasing costs.

[0005] To achieve this purpose, the present invention is a system designed to improve the anti-sidewind capability of a vehicle 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 the oncoming vehicle, the real-time speed of the vehicle, and the relative speed between the vehicle and the oncoming vehicle, and calculate the meeting time based on the relative speed between the vehicle and the oncoming vehicle and the longitudinal distance between the vehicle and the oncoming vehicle; calculate the meeting time based on the real-time speed of the vehicle and the relative speed between the vehicle and the oncoming vehicle;

[0007] The active lateral stabilizer bar control module is used to calculate the torsional moment value required for the lateral stabilizer bar in the oncoming vehicle according to the relative speed between the own vehicle and the oncoming vehicle, the lateral distance between the own vehicle and the oncoming vehicle and the maximum speed of the own vehicle;

[0008] The active stabilizer bar control module is also used to control the torsional moment of the stabilizer bar during the meeting process according to the meeting time, the meeting time period, and the torsional moment value required by the stabilizer bar during the meeting.

[0009] Furthermore, the meeting process includes a meeting time T, a pre-meeting time period T1, a meeting time period T2, and a post-meeting time period T3.

[0010] Furthermore, the oncoming time T is calculated according to 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:

[0011] T = L / V1;

[0012] Wherein, 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 oncoming process according to the torsional moment value required by the lateral stabilizer bar is:

[0014] The active lateral stabilizer bar control module increases the torsional torque of the lateral stabilizer bar in the time period before meeting the vehicle T1, increases it to the torsional torque value required for the lateral stabilizer bar meeting the vehicle at the meeting time T, and maintains the torsional torque value required for the lateral stabilizer bar meeting the vehicle in the meeting time period T2, reduces the torsional torque of the lateral stabilizer bar in the time period after meeting the vehicle T3, and returns to the torsional torque of the lateral stabilizer bar during normal driving of the vehicle in the time period after meeting the vehicle T3.

[0015] Furthermore, the specific calculation method of the time period before the oncoming vehicle T1 is: T1 = T S +K / V k ,

[0016] Among them, T S is the response time of the active lateral stabilizer bar torsional moment change, V k is the response speed of the active lateral stabilizer bar torsional torque change, and K is the torsional torque value required by the lateral stabilizer bar in the vehicle approach.

[0017] Furthermore, the calculation method of the meeting time period T2 is:

[0018] T2=V1C1+V2C2,

[0019] Among them, C1 is the first calibration value, C2 is the second calibration value, V1 is the relative speed between the vehicle and the oncoming vehicle, and V2 is the real-time speed of the vehicle.

[0020] Furthermore, the calculation of the torsional moment value required for the lateral stabilizer bar during the vehicle encounter is:

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

[0022] Among them, C3 is the third calibration quantity, C4 is the fourth calibration quantity, V Xis the maximum speed of the vehicle, V1 is the relative speed between the vehicle and the oncoming vehicle, L2 is the lateral distance between the vehicle and the oncoming vehicle, and K is the torsional torque value required for the lateral stabilizer bar during oncoming traffic.

[0023] Furthermore, the post-oncoming time period T3 is determined by the active lateral stabilizer bar controlled torsional torque change response time, the active lateral stabilizer bar controlled torsional torque change response speed, and the torsional torque value required by the lateral stabilizer bar during the oncoming process.

[0024] The method for improving the anti-sidewind capability of an automobile designed based on the system for improving the anti-sidewind capability of an automobile by using an active stabilizer bar comprises the following steps:

[0025] Calculate the longitudinal distance and lateral distance between the vehicle and the oncoming vehicle, the real-time speed of the vehicle, and the relative speed between the vehicle and the oncoming vehicle, and calculate the meeting time based on the relative speed between the vehicle and the oncoming vehicle and the longitudinal distance between the vehicle and the oncoming vehicle; calculate the meeting time period based on the real-time speed of the vehicle and the relative speed between the vehicle and the oncoming vehicle;

[0026] The torsional moment value required for the lateral stabilizer bar in the oncoming vehicle is calculated according to the relative speed between the own vehicle and the oncoming vehicle, the lateral distance between the own vehicle and the oncoming vehicle and the maximum speed of the own vehicle;

[0027] According to the meeting time, the meeting time period, and the torsional moment value required by the lateral stabilizer bar during the meeting, the torsional moment of the lateral stabilizer bar is controlled during the meeting process.

[0028] The beneficial effects of the present invention are as follows: when vehicles meet, the greater the speed difference, the greater the impact of the airflow on the stability of the vehicle body, the vehicle body will tilt, thereby reducing the driver's confidence. For vehicles equipped with active lateral stabilizer bars and adaptive cruise control systems, before merging with other vehicles, the adaptive cruise control system calculates the meeting time and relative vehicle speed, adjusts the relative position of the active lateral stabilizer bar in advance, and increases the torsional stiffness preload, so as to reduce the interference of crosswind on the vehicle body tilt when meeting other vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the present invention;

[0030] Figure 2 It is a time and torsional torque curve diagram of the present invention. DETAILED DESCRIPTION

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

[0032] A specific embodiment of a system designed by the present invention to improve the crosswind resistance of an automobile by using an active stabilizer bar:

[0033] Example 1

[0034] like Figure 1 A system for improving the crosswind resistance of a vehicle by an active stabilizer bar is shown, 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 the oncoming vehicle, the real-time speed of the vehicle, and the relative speed between the vehicle and the oncoming vehicle, and calculate the meeting time based on the relative speed between the vehicle and the oncoming vehicle and the longitudinal distance between the vehicle and the oncoming vehicle; calculate the meeting time based on the real-time speed of the vehicle and the relative speed between the vehicle and the oncoming vehicle;

[0036] The active lateral stabilizer bar control module is used to calculate the torsional moment value required for the lateral stabilizer bar in the oncoming vehicle according to the relative speed between the own vehicle and the oncoming vehicle, the lateral distance between the own vehicle and the oncoming vehicle and the maximum speed of the own vehicle;

[0037] The active stabilizer bar control module is also used to control the torsional moment of the stabilizer bar during the meeting process according to the meeting time, the meeting time period, and the torsional moment value required by the stabilizer bar during the meeting.

[0038] In the above technical solution, the meeting process includes the meeting time T, the pre-meeting time period T1, the meeting time period T2 and the post-meeting time period T3. Figure 2 As shown, the host vehicle and the oncoming vehicle begin to meet at the meeting time T, and the host vehicle and the oncoming vehicle end meeting at the time when the meeting time period T2 and the post-meeting time period T3 intersect.

[0039] In the above technical solution, the oncoming time T is calculated according to 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] Wherein, 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 oncoming process according to the torsional moment value required by the lateral stabilizer bar is:

[0043] like Figure 2As shown, in the time period before meeting the vehicle T1, the active lateral stabilizer bar control module increases the torsional torque of the lateral stabilizer bar by changing the relative position of the active lateral stabilizer bar, increases it to the torsional torque value required for the active lateral stabilizer bar in meeting the vehicle at the meeting time T, and maintains the torsional torque value required for the active lateral stabilizer bar in meeting the vehicle in the time period T2, reduces the torsional torque of the lateral stabilizer bar in the time period after meeting the vehicle T3, and returns to the torsional torque of the lateral stabilizer bar during normal driving of the vehicle in the time period T3 after meeting the vehicle.

[0044] During the meeting time period T2, the vehicle and the oncoming vehicle are in the meeting stage. The greater the speed difference between the vehicle and the oncoming vehicle, the greater the impact of the airflow generated during the meeting on the vehicle body stability, and the body will roll. Therefore, during the meeting time period T2, the active lateral stabilizer bar maintains the torsional moment value required during the meeting to reduce the interference of the crosswind on the body roll during the meeting.

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

[0046] Among them, T S is the response time of the active lateral stabilizer bar torsional moment change, V k is the response speed of the torsional torque change controlled by the active lateral stabilizer bar, and K is the torsional torque value required by the lateral stabilizer bar in meeting the vehicle. The change of torsional torque controlled by the active lateral stabilizer bar is not sudden, but requires a certain response time. The time period before meeting the vehicle T1 is the response time for the active lateral stabilizer bar to increase the torsional torque value to the torsional torque value required by the active lateral stabilizer bar in meeting the vehicle.

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

[0048] T2=V1C1+V2C2,

[0049] Among them, C1 is the first calibration quantity, and C2 is the second calibration quantity. The calibration quantity is calibrated based on subjective evaluation by repeatedly simulating the oncoming conditions in the test site. Under normal circumstances, C1 takes a value of 0.005 and C2 takes a value of 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 time period T2 is related to the speed of the vehicle and the oncoming vehicle. When the speed of the vehicle and the oncoming vehicle change, the oncoming time period T2 will inevitably change accordingly. However, the speed of the vehicle and the speed of the oncoming vehicle have different degrees of influence on the oncoming time period. Therefore, the first calibration quantity C1 and the second calibration quantity C2 are proportional parameters that reflect the degree of influence of the speed of the vehicle and the speed of the oncoming vehicle on the oncoming time period T2.

[0050] In the above technical solution, the calculation of the torsional moment value required for the lateral stabilizer bar in the oncoming vehicle is:

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

[0052] Among them, C3 is the third calibration value and C4 is the fourth calibration value. The calibration value is repeated in the test site to simulate the passing condition and is calibrated according to subjective evaluation. Generally, C3 takes a value of 200 and C4 takes a value of 400. X is the maximum speed of the vehicle, which is determined by the vehicle's factory performance and is a fixed value. V1 is the relative speed between the vehicle and the oncoming vehicle. L2 is the lateral distance between the vehicle and the oncoming vehicle. K is the torsional torque value required for the lateral stabilizer bar during oncoming traffic.

[0053] During driving, the faster the relative speed between the vehicle and the oncoming vehicle, the greater the torsional torque value required for the lateral stabilizer bar during the oncoming vehicle, and the closer the lateral distance between the vehicle and the oncoming vehicle, the greater the torsional torque value required for the lateral stabilizer bar during the oncoming vehicle. The relative speed and lateral distance between the vehicle and the oncoming vehicle have an impact on the stability of the vehicle body during the oncoming vehicle, but the degree of impact varies according to different oncoming situations and environments. Therefore, the third calibration quantity C3 and the fourth calibration quantity C4 are a kind of proportional parameters, which can reflect the degree of impact of the relative speed and lateral distance between the vehicle and the oncoming vehicle on the stability of the vehicle body during the oncoming vehicle, and need to be calibrated subjectively at the test site. If the calibration values ​​of the third calibration quantity C3 and the fourth calibration quantity C4 are appropriate, they can even completely offset the interference of the side wind on the body roll during the oncoming vehicle.

[0054] In the above technical solution, the post-meeting time period T3 is determined by the active lateral stabilizer bar control torsional torque change response time, the active lateral stabilizer bar control torsional torque change response speed 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 an automobile involved in the system for improving the crosswind resistance of an automobile by using an active stabilizer bar comprises the following steps:

[0057] Calculate the longitudinal distance and lateral distance between the vehicle and the oncoming vehicle, the real-time speed of the vehicle, and the relative speed between the vehicle and the oncoming vehicle, and calculate the meeting time based on the relative speed between the vehicle and the oncoming vehicle and the longitudinal distance between the vehicle and the oncoming vehicle; calculate the meeting time period based on the real-time speed of the vehicle and the relative speed between the vehicle and the oncoming vehicle;

[0058] The torsional moment value required for the lateral stabilizer bar in the oncoming vehicle is calculated according to the relative speed between the own vehicle and the oncoming vehicle, the lateral distance between the own vehicle and the oncoming vehicle and the maximum speed of the own vehicle;

[0059] According to the meeting time, the meeting time period, and the torsional moment value required by the lateral stabilizer bar during the meeting, the torsional moment of the lateral stabilizer bar is controlled during the meeting process.

[0060] Example 3

[0061] The present invention also includes a computer program product, including a computer program / instruction, which, when executed by a processor, implements the steps of the above-mentioned method for improving the ability of an automobile to resist crosswinds.

[0062] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A system for improving the ability of a car to resist side winds by using an active stabilizer bar, which includes 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 the oncoming vehicle, the real-time speed of the vehicle, and the relative speed between the vehicle and the oncoming vehicle, and calculate the meeting time based on the relative speed between the vehicle and the oncoming vehicle and the longitudinal distance between the vehicle and the oncoming vehicle; calculate the meeting time based on the real-time speed of the vehicle and the relative speed between the vehicle and the oncoming vehicle; The active lateral stabilizer bar control module is used to calculate the torsional moment value required for the lateral stabilizer bar in the oncoming vehicle according to the relative speed between the own vehicle and the oncoming vehicle, the lateral distance between the own vehicle and the oncoming vehicle and the maximum speed of the own vehicle; The active stabilizer bar control module is also used to control the torsional moment of the stabilizer bar during the meeting process according to the meeting time, the meeting time period, and the torsional moment value required by the stabilizer bar during the meeting.

2. The system for improving the side wind resistance of a vehicle by using an active stabilizer bar according to claim 1, characterized in that: The meeting process includes the meeting time T, the pre-meeting time period T1, the meeting time period T2 and the post-meeting time period T3.

3. The system for improving the crosswind resistance of an automobile by using an active stabilizer bar according to claim 2, wherein the oncoming vehicle time T is calculated according to the longitudinal distance between the vehicle and the oncoming vehicle and the relative speed between the vehicle and the oncoming vehicle by using the following formula: 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 the side wind resistance of a vehicle by using an active stabilizer bar according to claim 2, characterized in that: The specific method for controlling the torsional moment of the lateral stabilizer bar during the meeting process according to the torsional moment value required by the lateral stabilizer bar is as follows: The active lateral stabilizer bar control module increases the torsional torque of the lateral stabilizer bar in the time period before meeting the vehicle T1, increases it to the torsional torque value required for the lateral stabilizer bar meeting the vehicle at the meeting time T, and maintains the torsional torque value required for the lateral stabilizer bar meeting the vehicle in the meeting time period T2, reduces the torsional torque of the lateral stabilizer bar in the time period after meeting the vehicle T3, and returns to the torsional torque of the lateral stabilizer bar during normal driving of the vehicle in the time period after meeting the vehicle T3.

5. The system for improving the side wind resistance of a vehicle by using an active stabilizer bar according to any one of claims 2 to 4, characterized in that: The specific calculation method of the time period T1 before the meeting is: T1 = T S +K / V k , Among them, T S is the response time of the active lateral stabilizer bar torsional moment change, V k is the response speed of the torsional torque change of the active lateral stabilizer bar, and K is the torsional torque value required by the lateral stabilizer bar in the vehicle encounter.

6. The system for improving the side wind resistance of a vehicle by using an active stabilizer bar according to any one of claims 2 to 4, characterized in that: The calculation method of the meeting time period T2 is: T2=V1C1+V2C2, Among them, C1 is the first calibration value, C2 is the second calibration value, V1 is the relative speed between the vehicle and the oncoming vehicle, and V2 is the real-time speed of the vehicle.

7. The system for improving the side wind resistance of a vehicle by using an active stabilizer bar according to any one of claims 1 to 4, characterized in that: The calculation of the torsional moment value required for the lateral stabilizer bar in the vehicle encounter is: K=V1C3 / V X +C4 / L2; Among them, C3 is the third calibration quantity, C4 is the fourth calibration quantity, V X is the maximum speed of the vehicle, V1 is the relative speed between the vehicle and the oncoming vehicle, L2 is the lateral distance between the vehicle and the oncoming vehicle, and K is the torsional torque value required for the lateral stabilizer bar during oncoming traffic.

8. The system for improving the side wind resistance of a vehicle by using an active stabilizer bar according to claim 2, characterized in that: The post-oncoming time period T3 is determined by the active lateral stabilizer bar control torsional torque change response time, the active lateral stabilizer bar control torsional torque change response speed, and the torsional torque value required by the lateral stabilizer bar during the oncoming process.

9. A method for improving the ability of a vehicle to resist side winds based on the system for improving the ability of a vehicle to resist side winds by an active stabilizer bar as claimed in any one of claims 1 to 8, characterized in that: The steps include: Calculate the longitudinal distance and lateral distance between the vehicle and the oncoming vehicle, the real-time speed of the vehicle, and the relative speed between the vehicle and the oncoming vehicle, and calculate the meeting time based on the relative speed between the vehicle and the oncoming vehicle and the longitudinal distance between the vehicle and the oncoming vehicle; calculate the meeting time period based on the real-time speed of the vehicle and the relative speed between the vehicle and the oncoming vehicle; The torsional moment value required for the lateral stabilizer bar in the oncoming vehicle is calculated according to the relative speed between the own vehicle and the oncoming vehicle, the lateral distance between the own vehicle and the oncoming vehicle and the maximum speed of the own vehicle; According to the meeting time, the meeting time period, and the torsional moment value required by the lateral stabilizer bar during the meeting, the torsional moment of the lateral stabilizer bar is controlled during the meeting process.

10. A computer program product, comprising a computer program / instruction, which implements the steps of the method according to claim 9 when executed by a processor.

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