Vehicle Collision Avoidance Steering Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing collision avoidance systems for vehicles, which rely on turning control to avoid obstacles, can cause uncomfortable driving experiences when road friction is low, as the reaction force from the road surface is insufficient, leading to unstable vehicle control and discomfort for the driver.
Innovation Solution
A driving assistance system that adjusts the target control values for turning control based on the actual state variables of the vehicle, such as speed and acceleration, to reduce the amount of steering required, thereby matching the driver's feeling and ensuring stable vehicle operation, even in low friction conditions. This system includes a recognition part, a target control value setting part, a control part, and a control value correction part to estimate the road surface friction and adjust the turning control accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic steering control is performed to avoid collision by turning the vehicle, then collision avoidance capability is improved, but driver comfort deteriorates due to excessive steering input on low-friction road surfaces
Solution Approach 1:
The control value correction part continuously monitors state variables (acceleration, speed, steering angle) during collision avoidance control and compares actual values with target values. When the difference exceeds a threshold, indicating low road friction, the system automatically corrects the target steering angle to reduce excessive steering input, thereby maintaining driver comfort while preserving collision avoidance effectiveness
Solution Approach 2:
The system dynamically adjusts the target steering angle parameter based on detected road friction conditions. By correcting the target steering angle downward when low friction is detected, the system adapts the steering control to match actual road conditions, preventing uncomfortable over-steering while maintaining adequate collision avoidance capability
2Reliability
If large steering angle is applied for collision avoidance turning, then avoidance effectiveness is improved, but vehicle stability deteriorates on low-friction road surfaces
Solution Approach 1:
The system uses feedback from state variables including lateral acceleration and steering angle to detect when the vehicle is experiencing unstable behavior on low-friction surfaces. When instability is detected, the control value correction part reduces the target steering angle, thereby restoring vehicle stability while maintaining collision avoidance function
Solution Approach 2:
Instead of applying the full calculated steering angle, the system applies a corrected, reduced steering angle when low friction conditions are detected. This partial action approach prevents excessive steering that would cause instability, while still providing sufficient steering input to achieve collision avoidance
Data Source
Figure 1
Figure 2
Figure 3
AI summary
In a driving assistance system for a vehicle according to the present invention, when a solid object existing in the traveling direction of the driver's own vehicle is recognized, a target control value setting part sets a target control value pertaining to control for avoiding a collision including turning control of the driver's own vehicle in order to bring a running state of the driver's own vehicle to a target running state that causes the driver' own vehicle to avoid a collision with the solid object. A control part performs collision avoidance control in accordance with the target control value. Moreover, a control value correction part corrects the target control value pertaining to the turning control of the driver's own vehicle based on the value of a state variable relating to the running state of the driver's own vehicle during the time in which the control by said control part is performed and said target control value associated with said state variable.