Vehicle Yaw Control via Suspension Damping Force Adjustment
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Solution Overview
Problem
Conventional vehicle suspension systems struggle to accurately control yaw motion, affecting steering ability and stability, especially during sudden maneuvers, due to the lack of precise control over damping forces and their directional influence on yaw motion.
Innovation Solution
A method and apparatus that calculate roll angle and roll angular velocity to set different damping forces for front and rear wheel dampers, adjusting between two modes to achieve a target yaw rate, thereby improving steering ability and stability by controlling damping forces based on state information such as steering angle, wheel speeds, and lateral acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional damper control methods are used, then ride comfort is maintained, but yaw motion control precision deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting damper force characteristics based on vehicle operating conditions (steering angle, yaw rate, roll angle). The control system modifies damping forces in real-time to optimize yaw motion control precision without requiring additional hardware, thereby resolving the contradiction between control precision and system complexity.
2Measurement precision
If damper control is based only on vertical direction behavior, then ride comfort is improved, but lateral direction control accuracy deteriorates
Solution Approach 1:
The patent implements multi-functionality by enabling the damper system to simultaneously control both vertical ride comfort and lateral yaw motion. The control strategy integrates both vertical and lateral direction considerations, allowing the same damper mechanism to perform dual functions without complicating the operation interface.
3Reliability
If damping forces are not differentiated between front and rear wheels, then system simplicity is maintained, but steering ability and stability deteriorate
Solution Approach 1:
The patent applies local quality by differentiating damping force control between front and rear wheels based on their specific functional requirements. Front dampers are controlled to optimize steering response, while rear dampers are controlled to enhance vehicle stability. This localized differentiation improves overall vehicle performance without requiring complex additional hardware.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances vehicle driving performance by accurately controlling yaw motion, improving steering ability and stability through adaptive damping force settings, without the need for additional hardware, thus offering better handling and safety during various driving situations.
Implementation Method 1
a spring which absorbs impact in a first one stroke and a damper which copes with impact after the first stroke. The damper controls the width (stroke) of expansion of the spring.
Data Source
AI summary
A control method includes calculating a roll angle and a roll angular velocity of a vehicle, setting damping forces applied to front and rear wheel dampers to execute first and second modes according to signs of the roll angle and roll angular velocity, and controlling the front and rear wheel dampers in consideration of the damping forces. Upon determination that the signs of the roll angle and the roll angular velocity are different, in the first mode, damping force greater than front wheel reference force and damping force smaller than rear wheel reference force are set to be applied to the front wheel dampers and the rear wheel dampers, respectively, and in the second mode, damping force smaller than the front wheel reference force and damping force greater than the rear wheel reference force are set to be applied to the front wheel dampers and the rear wheel dampers, respectively.