AWD Driving Force Distribution Control for Stable Cornering
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Solution Overview
Problem
Existing all-wheel drive systems face issues with driving stability when maintaining user-selected front-wheel and rear-wheel driving force distribution ratios, leading to oversteer, understeer, or excessive wheel slip during vehicle maneuvers, compromising both stability and comfort.
Innovation Solution
A driving force adjusting device and method that dynamically adjusts the distribution ratio based on road friction, vehicle state, and user input, incorporating multiple driving units to redistribute force and maintain stability while preserving user-selected comfort settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the user-selected driving force distribution ratio is maintained during vehicle turning, then user riding comfort is preserved, but driving stability deteriorates due to oversteer, understeer, or excessive wheel slip
Solution Approach 1:
The system dynamically adjusts the driving force distribution ratio based on vehicle operating conditions (turning, acceleration, deceleration) while preserving the user-selected comfort settings. The control unit modifies the distribution ratio in real-time according to vehicle state, enabling the system to adapt between maintaining user comfort and ensuring driving stability without requiring manual user intervention for each condition change.
2Reliability
If the driving force distribution ratio is adjusted for driving stability, then oversteer and understeer are reduced, but user-selected riding comfort cannot be felt
Solution Approach 1:
The control unit continuously monitors vehicle operating conditions and adjusts the driving force distribution ratio based on feedback from sensors detecting vehicle state (turning, acceleration, deceleration). This closed-loop control enables the system to automatically balance driving stability and user comfort by making real-time adjustments without user awareness, preserving the user-selected comfort settings while ensuring stable driving behavior.
3Adaptability or versatility
If clutch control is used to distribute driving force in all-wheel drive systems, then driving force can be distributed between front and rear wheels, but maximum driving force cannot be applied to non-directly connected driving wheels
Solution Approach 1:
The system uses dynamic clutch control to adjust the driving force distribution ratio between front and rear wheels based on real-time vehicle conditions. By controlling the clutch engagement dynamically rather than statically, the system can maximize power transmission to the driving wheels while maintaining the ability to distribute driving force flexibly between axles, overcoming the limitation of fixed clutch control in traditional all-wheel drive systems.
Data Source
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AI summary
A driving force adjusting device includes an input unit configured for receiving an input of a selection distribution ratio, which is a ratio of driving force generation of front wheels and rear wheels selected by a user, a receiving unit configured for receiving driving information of a vehicle, a driving force determination unit configured for determining a driving force distribution ratio, which is a driving force generation ratio of the front wheels and the rear wheels, and determining driving force of the front wheels and the rear wheels using the driving force distribution ratio, and a driving control unit configured for controlling a driving unit generating driving force of the vehicle based on the driving force determined by the driving force determination unit.