Optimal Acceleration Profile for Collision Avoidance
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Solution Overview
Problem
Existing collision avoidance systems typically only provide automatic braking and lack the capability to implement combined braking and steering to effectively avoid collisions, especially when the driver fails to take evasive action in time.
Innovation Solution
A system and method that determine an optimal vehicle path by using a two-dimensional table for optimal braking based on vehicle speed and road surface friction, and calculate optimal steering using a friction ellipse, enabling combined automatic braking and steering to prevent collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic braking is provided in collision avoidance systems, then collision prevention capability is improved, but the system lacks steering capability to effectively avoid collisions in all scenarios
Solution Approach 1:
The patent combines braking and steering functions into a unified collision avoidance system. The system integrates the braking control module with the steering control module, allowing them to work together synergistically. The optimization module coordinates both braking force application and steering angle adjustment to achieve collision avoidance, rather than relying on braking alone as in prior art.
Solution Approach 2:
The collision avoidance system is enhanced to perform multiple functions: it can apply braking forces, adjust steering angles, and optimize the combination of both actions. The system universally handles various collision scenarios by selecting appropriate combinations of braking and steering maneuvers, making it adaptable to different road conditions, vehicle states, and obstacle positions.
2Reliability
If combined braking and steering is implemented, then collision avoidance effectiveness is improved, but computational complexity and control difficulty increase
Solution Approach 1:
The system pre-calculates optimal braking and steering parameters using the friction ellipse model and performance lookup tables before actual collision scenarios occur. These pre-computed optimization parameters are stored and ready for rapid deployment when needed, avoiding complex real-time calculations during critical moments.
Solution Approach 2:
The patent introduces an optimization module that acts as an intermediary between the sensor input and the actuator output. This module receives vehicle state information and obstacle data, then translates them into coordinated braking and steering commands using pre-computed optimization parameters, simplifying the overall control architecture.
3Manufacturing precision
If real-time optimization calculations are performed, then optimal path accuracy is improved, but processing time increases which may delay response
Solution Approach 1:
The system performs complex optimization calculations offline and stores the results in performance lookup tables organized by vehicle speed and road friction coefficients. During real-time operation, the system only needs to query these pre-computed tables based on current sensor readings, achieving both high accuracy and fast response times.
Solution Approach 2:
The patent creates simplified representations of the complex optimization problem by generating lookup tables that copy the essential relationships between vehicle parameters, road conditions, and optimal control actions. These tabulated results allow rapid retrieval of near-optimal solutions without repeating the full optimization computation.
Data Source
AI summary
A system and method for providing an optimal collision avoidance path for a host vehicle that may potentially collide with a target vehicle. The method includes providing off-line an optimization look-up table for storing on the host vehicle that includes an optimal vehicle braking or longitudinal deceleration and an optimal distance along the optimal path based on a range of speeds of the host vehicle and coefficients of friction of the roadway surface. The method determines the current speed of the host vehicle and the coefficient of friction of the roadway surface during the potential collision, and uses the look-up table to determine the optimal longitudinal deceleration or braking of the host vehicle for the optimal vehicle path. The method also determines an optimal lateral acceleration or steering of the host vehicle for the optimal vehicle path based on a friction ellipse and the optimal braking.