Vehicle Turning Speed Control for Understeer Prevention
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Solution Overview
Problem
Conventional vehicle turning control technologies, such as torque vectoring and engine brake deceleration, face challenges like increased manufacturing costs and inaccurate deceleration control due to the need for separate devices and instantaneous steering angle considerations, respectively, which fail to effectively manage understeer phenomena during high-speed turns.
Innovation Solution
A vehicle turning control system that utilizes a database for road information, sensors for detecting vehicle parameters, and a controller to determine if the vehicle is entering a turning section, setting a target speed based on actual and target lateral acceleration, and controlling deceleration through a speed controller, torque limiter, and deceleration controller to ensure stable turning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If torque vectoring is used to prevent understeer phenomenon, then vehicle turning stability is improved, but manufacturing cost increases due to requiring separate torque distribution devices
Solution Approach 1:
The driving motor performs multiple functions: it provides propulsion and simultaneously executes torque vectoring for turning control. The controller distributes torque between left and right driving wheels through the existing motor, eliminating the need for separate torque distribution devices while maintaining turning stability
Solution Approach 2:
The patent combines the torque distribution function with the driving motor system. The motor serves both as a propulsion device and a torque vectoring device, merging previously separate functions into a single integrated system that reduces component count and manufacturing cost
2Speed
If engine brake deceleration is used before turning, then vehicle speed control is improved, but deceleration accuracy deteriorates due to considering only instantaneous steering angle
Solution Approach 1:
The controller performs preliminary deceleration control before the vehicle enters the turning section by detecting upcoming turns from road information and proactively reducing speed. This advance action allows the vehicle to enter turns at optimal speeds, improving both speed control and deceleration accuracy
Solution Approach 2:
The system uses feedback from multiple sensors (steering angle, wheel speed, acceleration, braking status, gear position) and pre-stored road information to continuously monitor vehicle state and adjust deceleration control. This closed-loop feedback mechanism improves deceleration accuracy by considering comprehensive vehicle parameters rather than just instantaneous steering angle
3Productivity
If high speed driving is maintained during turns, then productivity is improved, but understeer phenomenon worsens causing vehicle to be pushed out of turning radius
Solution Approach 1:
The system dynamically adjusts torque distribution between left and right driving wheels based on real-time vehicle state and road conditions. During turns, the controller modulates torque vectoring dynamically to maintain optimal turning radius, allowing higher speeds while preventing understeer
Solution Approach 2:
The controller changes torque parameters dynamically during turning by adjusting the torque difference between left and right wheels. This parameter modulation compensates for understeer effects, enabling maintained or increased speed while improving turning accuracy and preventing deviation from the turning radius
Data Source
AI summary
A turning control system of a vehicle includes: a database storing road information; a sensor part to detect a steering angle of a vehicle, a wheel speed of the vehicle, whether the vehicle is accelerated, whether the vehicle is braking, and whether a speed gear of the vehicle is shifted; and a controller that determines whether the vehicle enters a turning section based on one or more pieces of the information detected by the sensor part and the road information stored in the database. In particular, when the vehicle is entering the turning section, the controller sets a target speed of the vehicle and controls a speed of the vehicle to be decelerated to the set target speed.