Automobile cornering rollover prevention method and system

• US 10,407,058 B2
• Filed: 01/12/2016
• Issued: 09/10/2019
• Est. Priority Date: 01/15/2015
• Status: Active Grant

• Current Assignee: Yancheng Institute of Technology (Jiangsu Education Department)
• Original Assignee: Yancheng Institute of Technology (Jiangsu Education Department)
• Inventors: Liu, Fuhao
• Primary Examiner(s): Heinle, Courtney D
• Application Number:
  US15/319,263
• Publication Number:
  US 20170151942A1
• Time in Patent Office: 1,337 Days
• CPC Class Codes: B60Q 5/005 automatically actuated
• CPC Class Codes: B60Q 9/00 Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00 , e.g. haptic signalling
• CPC Class Codes: B60W 2030/043 about the roll axis
• CPC Class Codes: B60W 2040/1315 Location of the centre of gravity
• CPC Class Codes: B60W 2050/143 Alarm means
• CPC Class Codes: B60W 2510/22 Suspension systems
• CPC Class Codes: B60W 2520/12 Lateral speed
• CPC Class Codes: B60W 2520/18 Roll
• CPC Class Codes: B60W 2540/18 Steering angle
• CPC Class Codes: B60W 30/04 related to roll-over prevention
• CPC Class Codes: B60W 40/112 Roll movement
• CPC Class Codes: B60W 50/14 Means for informing the driver, warning the driver or prompting a driver intervention

Abstract

An automobile cornering rollover prevention system comprises a speed controller, a wheel deflection measuring instrument mounted on a front wheel of the automobile, force sensors mounted on axis positions of four wheels, and an angular speed measuring instrument and a speed controller mounted on the front wheel of the automobile, and the wheel deflection measuring instrument, the angular speed measuring instrument and the force sensor are all electrically connected to the speed controller. The speed controller is connected to a brake system of the automobile, so that the speed can be intelligently reduced through the brake system. When a driver changes θ₁ according to a road condition, the speed controller may calculate a critical radius in real time and then compare the speed and give a command in real time for controlling the speed, so that the speed is maintained in an ideal range.

Claims

1. An automobile cornering rollover prevention method, comprising:

A. obtaining inherent parameters of the automobile, and measuring a center-of-gravity position, a deflection angle θ

₁ of a front wheel and an angular speed of the front wheel of the automobile in real time, wherein the inherent parameters of the automobile comprise a distance L between axes of the front wheel and a rear wheel at the same side, a distance B between axes of two front wheels or two rear wheels, and a height h of the center-of-gravity position of the automobile from ground;

defining a cornering direction of the automobile as a cornering side and defining a negative cornering direction as an opposite side, i.e., a left side being the cornering side while a right side being the opposite side if the automobile turns left; and

then the right side being the cornering side, while the left side being the opposite side if the automobile turns right;

wherein, a distance between the center-of-gravity position and a connecting line of the axes of the two front wheels is b, and a distance between the center-of-gravity position and a connecting line of the axes of the front wheel at the opposite side and the rear wheel at the opposite side is a;

B. calculating a distance between the front wheel at the cornering side and an instantaneous center, which is r₁=L/sin(θ

₁)

C. calculating a center-of-gravity angle θ

_G formed by the center of gravity—

the instantaneous center—

the axis of the rear wheel of the automobile, wherein a calculation formula is as follows;

θ

_G=tan<sup>−

1</sup>((L−

b)/(B−

a+r₁ cos(θ

₁)));

D. calculating a distance r_G between the instantaneous center and the center of gravity, wherein a calculation formula is as follows;

2. The automobile cornering rollover prevention method according to claim 1, wherein the center-of-gravity position is determined through a following manner:

obtaining values F₁, F₂, F₃ and F₄ of four force sensors mounted on the axis positions of the front wheel at the cornering side, the front wheel at the opposite side, the rear wheel at the opposite side and the rear wheel at the cornering side, wherein a distance a between the center-of-gravity position and the connecting line of the axes of the front wheel at the opposite side and the rear wheel at the opposite side is obtained through a following formula;

3. The automobile cornering rollover prevention method according to claim 1, wherein when the current speed is detected to be larger than the critical speed, and needs to be reduced, alarming is given through an alarm.

4. An automobile cornering rollover prevention system controlled using the method according to claim 1, comprising a speed controller, a wheel deflection measuring instrument mounted on a front wheel of the automobile, force sensors mounted on axis positions of four wheels, and an angular speed measuring instrument and a speed controller mounted on the front wheel of the automobile, and the wheel deflection measuring instrument, the angular speed measuring instrument and the force sensor are all electrically connected to the speed controller.

5. The automobile cornering rollover prevention system according to claim 4, further comprising an alarm, wherein the alarm is electrically connected to the speed controller.

6. The automobile cornering rollover prevention system according to claim 5, wherein the alarm comprises a sound alarm and/or a light alarm, the sound alarm is mounted in a driving cab, and the light alarm is mounted on an instrument board or a steering wheel.

7. The automobile cornering rollover prevention method according to claim 1, wherein when the current speed is detected to be larger than the critical speed, and needs to be reduced, alarming is given through an alarm, and

wherein when a deceleration caused by triggering the alarm continuously occurs within a time frame, a second-class alarming is given through the alarm.