Vehicle Forward Collision Avoidance with Braking-Steering Coordination
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Solution Overview
Problem
Existing forward collision warning and active collision avoidance systems primarily rely on longitudinal braking, leading to excessive interference for drivers due to frequent warnings and conservative braking strategies, which do not maximize collision avoidance effectiveness.
Innovation Solution
A forward collision avoidance method that integrates braking and steering, determining the appropriate collision avoidance manner based on vehicle and obstacle speeds, and calculates collision avoidance distances using operational formulas considering reaction time, relative acceleration, and obstacle conditions, allowing for adaptive collision avoidance strategies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only longitudinal braking is used for collision avoidance, then the system is simple to implement, but warning frequency is excessive and driver interference is increased
Solution Approach 1:
The patent combines longitudinal braking with lateral steering capabilities to form an integrated collision avoidance system. The control device coordinates both braking actuators and steering actuators to execute composite avoidance maneuvers, reducing reliance on frequent braking warnings alone and thereby reducing driver interference while maintaining safety.
Solution Approach 2:
The system dynamically selects between different collision avoidance modes (braking-only, steering-only, or combined) based on real-time vehicle state, obstacle characteristics, and environmental conditions. This dynamic adaptability allows the system to optimize warning and intervention frequency, reducing unnecessary driver interference while maintaining effective collision avoidance.
2Device complexity
If only longitudinal braking is used for collision avoidance, then the control strategy is simple, but collision avoidance effectiveness is limited
Solution Approach 1:
The patent merges longitudinal braking control with lateral steering control to create a more effective collision avoidance system. By combining these two control dimensions, the system can achieve collision avoidance in scenarios where braking alone would be insufficient, thereby improving overall reliability and effectiveness.
Solution Approach 2:
The system changes the control parameters from单一的braking force to a combination of braking force and steering angle. This parameter expansion allows the system to access additional degrees of freedom for collision avoidance, improving effectiveness in diverse scenarios while managing complexity through structured control logic.
3Reliability
If braking warning distance is set to ensure sufficient reaction time, then collision avoidance success rate is improved, but warning frequency increases causing driver interference
Solution Approach 1:
The system dynamically adjusts warning thresholds and collision avoidance strategies based on vehicle speed, distance to obstacle, and relative velocity. By adapting to real-time conditions, the system maintains high collision avoidance success rates while reducing unnecessary warnings that would interfere with normal driving operations.
Solution Approach 2:
The patent applies different warning and control strategies to different spatial and temporal conditions. Rather than using a fixed warning distance, the system tailors its behavior to specific driving scenarios, ensuring adequate reaction time when needed while avoiding excessive warnings in lower-risk situations, thereby reducing driver interference.
4Reliability
If maximum braking capacity is activated for emergency avoidance, then collision avoidance effectiveness is improved, but driving comfort is reduced
Solution Approach 1:
The patent combines steering and braking actions to achieve collision avoidance, allowing the system to reduce reliance on maximum braking alone. By distributing the avoidance effort across both steering and braking, the system can achieve effective collision avoidance while reducing the intensity of braking events, thereby improving driving comfort.
Solution Approach 2:
The system changes the control approach from maximum braking to a coordinated combination of moderate braking and steering. This parameter change allows the system to achieve the same collision avoidance effectiveness while reducing the harshness of the braking event, thereby improving driving comfort during emergency maneuvers.
Data Source
Figure 1
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Figure 3B~3C
AI summary
The present invention provides a forward collision avoidance method and system of a vehicle. The method includes: determining the current speed of the vehicle and the current speed of a front obstacle; determining a collision avoidance manner to be adopted by the vehicle, wherein the collision avoidance manner includes single braking collision avoidance, single steering collision avoidance, or a combination of braking collision avoidance and steering collision avoidance; performing calculation according to the current speeds and the determined collision avoidance manner through a set operational formula to obtain a collision avoidance distance corresponding to the determined collision avoidance manner; determining the current distance between the vehicle and the front obstacle; and judging whether the current distance reaches the collision avoidance distance, and if the judgment result is yes, judging that a collision avoidance condition is tenable. In the present invention, the braking collision avoidance and the steering collision avoidance are comprehensively considered, so that the collision avoidance frequency can be effectively reduced, and the interference to the driver can be reduced to better conform to the driving habits.