AWD Torque Control for Drift Driving State
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-performance vehicles with all-wheel drive (AWD) systems cannot perform drift driving due to slip suppression, forcing consumers to choose between unstable two-wheel drive vehicles that allow drifting but lack stability and AWD vehicles that cannot drift but offer better stability and traction.
Innovation Solution
A method controlling the vehicle's driving state using a combination of limited slip differential (LSD) and AWD systems, where the controller reduces front wheel torque distribution in drift mode, adds slip control torque based on lateral acceleration, and maintains drift by releasing front wheel torque during counter steering, while applying damping torque to stabilize yaw angular acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If all-wheel drive (AWD) system is equipped to improve driving stability and traction performance, then driving stability is improved, but drift driving capability deteriorates due to slip suppression function
Solution Approach 1:
The AWD system dynamically adjusts torque distribution between front and rear wheels based on detected driving conditions. During drift driving, the controller reduces front wheel torque to allow rear wheel slip while maintaining rear wheel drive capability, enabling the system to transition from stability-focused torque distribution to drift-enabled torque distribution
Solution Approach 2:
The system changes the torque distribution parameter from equal or front-biased distribution during normal driving to rear-biased distribution during drift mode. The controller detects drift conditions through sensors and adjusts the torque split ratio, reducing front wheel torque and increasing rear wheel torque to enable controlled slip and drift driving
2Adaptability or versatility
If two-wheel drive (2WD) based on front engine rear drive (FR) is used to enable drift driving, then drift capability is improved, but driving stability deteriorates
Solution Approach 1:
The vehicle system achieves multi-functionality by combining AWD capability with drift driving capability. The same AWD system that provides stability during normal driving is configured to enable drift driving through controlled torque redistribution, eliminating the need to choose between 2WD for drifting or AWD for stability
3Force
If all-wheel drive (AWD) system is equipped to improve traction performance, then traction is improved, but rear wheel slip necessary for drift driving is suppressed
Solution Approach 1:
The system applies different torque characteristics to different wheel pairs. During drift mode, the controller reduces torque to front wheels while maintaining or increasing torque to rear wheels, creating local torque differentiation that allows rear wheel slip for drift while preserving overall traction through front wheel engagement
Data Source
AI summary
A method of controlling implementation of a drift driving state of a vehicle, may include a slip inducement step, wherein in a state that drift mode is selected, when a vehicle enters into rotary driving and is in a power-on state, a controller reduces front wheel distribution torque of all-wheel drive (AWD) system in comparison to cases other than the drift mode; a slip torque control step, wherein when a rear wheel slip of the vehicle is generated, the controller allows the vehicle to enter into drifting by adding slip control torque according to lateral acceleration of the vehicle to the front wheel distribution torque; and a drift maintenance step, wherein when a counter steering state by a driver is confirmed, the controller maintains a drift driving state of the vehicle by releasing all the front wheel distribution torque.