Vehicle Stability Control via Rear Wheel Steering and Braking
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Solution Overview
Problem
Current vehicle electronic stability control systems rely solely on braking force, leading to excessive braking and driver interference, which reduces driving pleasure and stability.
Innovation Solution
An apparatus and method that utilize a combination of rear wheel steering and braking, controlled by a control unit comparing a compensated moment with multiple reference values, allowing for proportional steering and braking adjustments based on vehicle speed, turning speed, and lateral acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only braking force is used for vehicle stability control, then the control system is simple, but excessive braking occurs causing driver interference and reduced driving pleasure
Solution Approach 1:
The patent combines rear wheel steering and braking functions into a unified stability control system. The control unit integrates both steering angle control and braking force application, allowing the system to select and coordinate multiple control methods (steering only, braking only, or combined) based on vehicle state, thereby reducing excessive braking and driver interference while maintaining system manageability
2Device complexity
If only braking force is applied to correct vehicle instability, then the control method is simple, but a great amount of braking force is needed which lowers driving pleasure
Solution Approach 1:
The patent implements dynamic control method selection based on real-time vehicle state. The control unit calculates vehicle stability margins and dynamically adjusts the mix of steering and braking interventions. When steering alone can correct instability, the system uses steering; when braking is needed, it applies minimal necessary braking force; when both are effective, it combines them. This dynamic adaptation reduces overall braking force magnitude while maintaining control effectiveness
3Manufacturing precision
If rear wheel steering is added to the stability control system, then vehicle control precision is improved, but device complexity increases
Solution Approach 1:
The control unit is designed to perform multiple functions: it processes steering angle inputs, calculates vehicle stability margins, determines appropriate control actions, and coordinates both steering and braking actuators. By making the control unit universal and multi-functional, the patent avoids the need for separate dedicated controllers for steering and braking, thereby improving control precision without proportionally increasing system complexity
Data Source
AI summary
A method for electronic stability control of a vehicle includes a compensated moment calculation operation of calculating a compensated moment according to an error between a desired turning speed calculated based on a steering angle and a vehicle speed of the vehicle and a turning speed of the vehicle; a compensated moment comparison operation of comparing the compensated moment calculated in the compensated moment calculation operation with a first reference value and a second reference value; steering rear wheels of the vehicle if it is determined that the compensated moment is equal to or larger than the first reference value and smaller than the second reference value; and a simultaneously performing steering of rear wheels of the vehicle and braking of the vehicle if it is determined that the compensated moment is equal to or larger than the second reference value.