Vehicle Stability Control via Perceived Yaw Center Tracking
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Solution Overview
Problem
Conventional vehicle control methods fail to maintain stability in non-linear ranges of lateral velocity, limiting vehicle response in performance scenarios.
Innovation Solution
A system and method to determine the perceived yaw center of a vehicle using dynamic variables, adjusting control parameters to align the actual yaw center with a desired location, employing sensors and processors to track and adjust for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional control methods maintain current commands when lateral velocity is within acceptable range, then vehicle control is simple and stable in linear range, but vehicle stability deteriorates in non-linear range of motion
Solution Approach 1:
The patent applies dynamics by making the control system adaptive to changing vehicle operating conditions. The controller dynamically adjusts control parameters based on whether the vehicle is in linear or non-linear lateral velocity range, transitioning from maintaining current commands to actively tracking desired yaw center location. This dynamic adaptation resolves the contradiction by enabling simple control in linear range while providing advanced stability control in non-linear range.
Solution Approach 2:
The patent changes control parameters based on the vehicle's operating state. When lateral velocity enters the non-linear range, the system switches from conventional parameter maintenance to active parameter adjustment where the controller modifies control commands to track the desired yaw center location. This parameter change strategy enables the system to maintain reliability across both linear and non-linear operating conditions.
2Ease of operation
If conventional methods track lateral velocity to maintain stability, then control is straightforward in linear range, but ability to improve vehicle response in non-linear range is lost
Solution Approach 1:
The patent implements feedback control by continuously monitoring actual yaw center location and comparing it with desired yaw center location. The controller uses this feedback to generate corrective control commands that reduce the difference between actual and desired positions. This feedback mechanism maintains ease of operation through automated control while significantly improving reliability in non-linear range by actively correcting vehicle response.
Solution Approach 2:
The patent introduces the yaw center location as an intermediary parameter that mediates between driver input and vehicle response. Rather than directly controlling lateral velocity, the system uses yaw center tracking as an intermediate control objective. This intermediary approach simplifies the control strategy while improving vehicle response characteristics in non-linear range.
Data Source
AI summary
A vehicle, system and method of operating a vehicle. A sensor for measures a dynamic variable of the vehicle. A processor determines a location of a perceived yaw center (PYC) of the vehicle from the dynamic variable, tracks a desired location of the PYC, and adjusts a control parameter of the vehicle to reduce a difference between the location of the PYC and the desired location of the PYC.