Anti-rollover control method for single-side automobile height adjustment of automobile

Abstract

The invention discloses an anti-rollover control method for single-side automobile height adjustment of an automobile, and belongs to the technical field of automobile active safety control. In order to solve the problems that an existing automobile is prone to rollover due to centrifugal force during high-speed sharp steering, and the intervention effect of a traditional rollover prevention means is limited, the automobile speed and the steering angle and steering direction of a steering wheel are collected in real time, and when the automobile speed is larger than or equal to 50 strides, the target side automobile body lifting height opposite to the steering direction is calculated according to the automobile speed and the steering angle of the steering wheel; a vehicle body height adjusting executing mechanism is controlled to adjust the height of a chassis on the corresponding side, so that the gravity center of the vehicle deviates in the reverse steering direction, and centrifugal force is accurately counteracted to prevent rollover; when the vehicle speed is less than 50 strides, adjustment is not triggered, and low-speed driving comfort is guaranteed. According to the method, the posture of the vehicle body is actively intervened only in the high-speed scene, the urgent steering risk avoiding requirement is met, response is rapid, the rollover restraining effect is remarkable, the method can be compatible with an existing air suspension or a hydraulic lifting suspension, and high engineering practicability and driving safety are achieved.

Description

Technical Field

[0001] This invention relates to the field of active safety control technology for automobiles, specifically to a control method that prevents a car from rolling over during high-speed sharp turns by adjusting the height of one side of the vehicle body to offset the center of gravity and counteract centrifugal force. Background Technology

[0002] As vehicle speeds increase, the risk of rollover during high-speed sharp turns and hazard avoidance scenarios becomes increasingly prominent. Traditional rollover prevention technologies rely on passive intervention methods such as Electronic Stability Program (ESP) and anti-roll bars to suppress roll by braking a single wheel or limiting suspension travel. However, during high-speed sharp turns, these methods are insufficient to quickly counteract the effects of centrifugal force on vehicle posture, leaving the risk of rollover failure unresolved. Existing active suspension technologies primarily focus on comfort and off-road capability, lacking dedicated single-side height adjustment logic for high-speed rollover risks and failing to efficiently utilize center of gravity shift mechanisms to resist rollovers.

[0003] Therefore, there is an urgent need for a rollover prevention control method that can actively adjust the height of one side of the vehicle body and accurately counteract centrifugal force to improve the rollover resistance of vehicles at high speeds. Summary of the Invention

[0004] This invention aims to overcome the shortcomings of existing automobiles that are prone to rollover due to centrifugal force during high-speed sharp turns and the limited effectiveness of traditional anti-rollover measures. It provides a method for controlling rollover by adjusting the height of one side of the vehicle. By actively adjusting the height of one side of the vehicle to offset the center of gravity, centrifugal force is specifically counteracted, effectively improving the anti-rollover performance in high-speed sharp turns.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A method for preventing rollover by adjusting the height of one side of a vehicle includes the following steps: (1) Real-time collection of vehicle speed, steering wheel rotation angle and steering direction; (2) Determine if the current vehicle speed is less than 50 mph. If it is less than 50 mph, do not trigger vehicle height adjustment; if it is greater than or equal to 50 mph, proceed to the next step. (3) Calculate the height that the target side of the vehicle needs to be raised based on the current vehicle speed and steering wheel rotation angle; (4) Control the vehicle height adjustment actuator to adjust the height of the target side chassis to the calculated height, so that the vehicle's center of gravity moves in the opposite direction of steering to counteract centrifugal force and prevent rollover; (5) Once the risk of rollover is eliminated, control the vehicle height to return to the initial state.

[0006] Furthermore, in step (3), the height of the target side vehicle body is positively correlated with the vehicle speed and the steering wheel rotation angle. The faster the vehicle speed and the larger the steering wheel rotation angle, the higher the height is.

[0007] Furthermore, in step (5), the judgment condition for the rollover risk to be eliminated is: the steering wheel rotation angle is restored to less than the preset safety threshold, or the vehicle speed is reduced to less than 50 mph.

[0008] Furthermore, the vehicle height adjustment actuator is an air suspension or a hydraulic lifting suspension.

[0009] Furthermore, in step (4), the response time of vehicle height adjustment does not exceed 500ms to ensure timely rollover suppression.

[0010] The present invention has the following beneficial effects: 1. Scene adaptation: Adjustment is triggered only in high-speed scenarios with a vehicle speed of ≥50 mph to avoid low-speed intervention affecting comfort and accurately match the needs of sharp turning and risk avoidance; 2. Highly efficient anti-rollover: By actively shifting the center of gravity through unilateral height adjustment, it directly counteracts centrifugal force, the core cause of rollover, resulting in a fast response and significant rollover suppression effect; 3. High compatibility: It can be adapted to existing air suspension, hydraulic lifting suspension and other actuators without major changes to the chassis structure, making it highly feasible for engineering projects; 4. Safety Redundancy: The vehicle automatically recovers its posture after the rollover risk is eliminated, avoiding long-term posture deviation from affecting driving performance and ensuring safety in all scenarios. Attached Figure Description

[0011] Figure 1 : Flowchart of the control method of the present invention. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0013] This invention proposes a vehicle height adjustment method to prevent rollover, which is based on a vehicle speed detection module, a steering wheel angle detection module, a control module, and a vehicle height adjustment execution module. The specific steps are as follows: (1) Signal acquisition: The vehicle speed detection module acquires the vehicle speed in real time, and the steering wheel angle detection module acquires the steering wheel rotation angle and steering direction, and transmits the signals to the control module; (2) Trigger judgment: The control module judges whether the vehicle speed is in the range of 0-50 mph. If the vehicle speed is <50 mph, it is judged as a low speed scenario and the height adjustment is not triggered; if the vehicle speed is ≥50 mph, the rollover risk prediction process is entered. (3) Height calculation: The control module calculates the height of the target side of the vehicle body opposite to the steering direction based on the preset vehicle speed-steering wheel angle mapping relationship. The height of the vehicle body is positively correlated with the vehicle speed and steering wheel angle. The faster the vehicle speed and the larger the steering wheel angle, the higher the height of the vehicle body. (4) Attitude adjustment: The control module drives the vehicle height adjustment actuator to adjust the target side chassis height to the calculated value, so that the vehicle center of gravity shifts to the opposite direction of steering, counteracting centrifugal force and suppressing the tendency to roll. (5) Posture recovery: When the risk of rollover is eliminated (steering wheel angle is restored to the safe threshold or vehicle speed is <50 mph), the control module restores the vehicle height to the initial state. Example

[0014] A passenger vehicle equipped with this method, featuring a vehicle speed sensor, steering wheel angle sensor, and air suspension, will respond as follows: When the vehicle is traveling at 60 mph and the driver suddenly turns the steering wheel to the left (45°) to avoid an obstacle: (1) The sensor collects the vehicle speed of 60 mph, turning angle of 45° and left turn direction, and transmits the signal to the control module; (2) The control module determines that the vehicle speed is ≥50 mph and triggers a rollover prediction; (3) It is calculated that the right side of the vehicle body (in the opposite direction of steering) needs to be raised by 30mm; (4) The air suspension raises the right side of the vehicle body by 30mm within 300ms, shifting the center of gravity to the right to counteract centrifugal force and suppress the tendency of the left side to roll over; (5) After the avoidance is completed, the steering wheel angle returns to within 5°, and the air suspension restores the vehicle height within 1 second. Example

[0015] When the vehicle is traveling at 45 mph, regardless of the turning angle, the control module determines it as a low-speed scenario and does not trigger height adjustment, thus ensuring comfort during low-speed driving.

[0016] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A method for preventing rollover by adjusting the height of one side of a vehicle, characterized in that, Includes the following steps: (1) Real-time collection of vehicle speed, steering wheel rotation angle and steering direction; (2) Determine if the current vehicle speed is less than 50 mph. If it is less than 50 mph, do not trigger vehicle height adjustment; if it is greater than or equal to 50 mph, proceed to the next step. (3) Calculate the height that the target side of the vehicle needs to be raised based on the current vehicle speed and steering wheel rotation angle; (4) Control the vehicle height adjustment actuator to adjust the height of the target side chassis to the calculated height, so that the vehicle's center of gravity moves in the opposite direction of steering to counteract centrifugal force and prevent rollover; (5) Once the risk of rollover is eliminated, control the vehicle height to return to the initial state.

2. The method for preventing rollover by adjusting the height of one side of a vehicle according to claim 1, characterized in that, In step (3), the height of the target side vehicle body is positively correlated with the vehicle speed and the steering wheel angle. The faster the vehicle speed and the larger the steering wheel angle, the higher the height is.

3. The method for preventing rollover by adjusting the height of one side of a vehicle according to claim 1, characterized in that, In step (5), the conditions for determining the risk of rollover are: the steering wheel rotation angle is restored to less than the preset safety threshold, or the vehicle speed is reduced to less than 50 mph.

4. The method for preventing rollover by adjusting the height of one side of a vehicle according to claim 1, characterized in that, The vehicle height adjustment mechanism is an air suspension or a hydraulic lifting suspension.

5. The method for preventing rollover by adjusting the height of one side of a vehicle according to claim 1, characterized in that, In step (4), the response time of vehicle height adjustment shall not exceed 500ms to ensure timely rollover suppression.

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