Left-Right Wheel Drive Force Distribution Control for Transient Yaw Response
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional left-right wheel drive force distribution control systems for vehicles fail to achieve the desired yaw rate change based on both steering speed and vehicle speed, leading to inadequate transient response control.
Innovation Solution
A vehicle left-right wheel drive force distribution control apparatus that computes a drive force difference transient control amount based on a driver's transient turn response request, incorporating a transient control computing section to adjust the drive force distribution between the left and right wheels, ensuring control is not solely dependent on steering speed but also considers vehicle speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If transient control is executed based solely on steering speed, then high-speed steering response is improved, but the target yaw rate cannot be properly determined when vehicle speed varies
Solution Approach 1:
The patent changes the control parameters from steering speed alone to a combination of steering speed and vehicle speed. The transient control amount computing means calculates the left-right drive force difference transient control amount based on both parameters, allowing the control system to adapt to different vehicle speeds while maintaining responsive steering control.
2Productivity
If transient control amount is increased for high steering speed, then transient response is improved, but control accuracy decreases when vehicle speed is not considered
Solution Approach 1:
The patent implements a feedback mechanism where the transient control amount computing means continuously calculates the appropriate transient control amount based on current steering speed and vehicle speed conditions. This feedback-based calculation ensures that the transient control amount is precisely adjusted according to actual driving conditions, improving both response performance and control precision.
Data Source
AI summary
A left-right drive force difference transient control computation value calculating section uses a map search, based on a change rate of a target yaw rate, to find a left-right rear wheel drive force difference transient control computation value, which is a basic target value for a turning response transiently requested by a driver. A left-right drive force difference transient control gain computing section sets a left-right drive force difference transient control gain to be smaller than 1 in a low vehicle speed region. A transient control computing section multiplies the left-right rear wheel drive force difference transient control computing value by the left-right drive force difference transient control gain to calculate a left-right rear wheel drive force difference transient control amount and contributes the same to a left-right wheel drive force distribution control.