Asymmetric Wheel Braking for Vehicle Lateral Avoidance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional collision avoidance systems for vehicles fail to effectively maintain braking force and assist steering force during braking, leading to increased collision probability due to loss of steering force, especially in situations where abrupt longitudinal collisions are predicted.
Innovation Solution
A collision avoidance apparatus and method that includes a measurement unit to detect the motion of an opposite vehicle, an electronic control unit to calculate collision risk, and provide braking and steering control signals to the wheel of the driver's steering intention direction, while releasing braking force from the opposite wheel, thereby maintaining steering force and enabling lateral avoidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a driver applies large brake pedal pressure to avoid longitudinal collision, then braking force increases and longitudinal collision risk is reduced, but steering force is lost and lateral avoidance becomes impossible
Solution Approach 1:
The patent segments the braking force application by wheel, providing different braking forces to left and right wheels independently. This allows the system to maintain steering capability while providing collision avoidance braking by applying brake force selectively to the wheel opposite the driver's steering input, rather than applying uniform brake force to all wheels.
Solution Approach 2:
The system applies different braking characteristics to different wheels based on local conditions. The wheel receiving steering input maintains reduced or no braking force to preserve steering capability, while the opposite wheel receives full braking force to achieve collision avoidance, creating localized quality differences in force application.
2Device complexity
If conventional collision avoidance systems only measure relative velocity and distance, then system complexity is reduced, but collision avoidance effectiveness is insufficient because braking distance varies with vehicle and road conditions
Solution Approach 1:
The system incorporates multiple sensors that continuously provide feedback about vehicle conditions (acceleration, yaw rate, steering angle) and environmental conditions. This feedback loop allows the collision avoidance algorithm to adapt braking and steering forces based on actual vehicle dynamics and road conditions, improving reliability without excessive complexity increase.
Solution Approach 2:
The electronic control unit performs multiple functions: it processes data from various sensors, calculates collision risk, determines optimal braking and steering forces, and coordinates multiple actuators. This multi-functionality approach consolidates complexity into a single control system rather than requiring separate specialized systems for each function.
3Reliability
If braking force is applied to all wheels during collision avoidance, then longitudinal collision risk is reduced, but lateral avoidance capability is lost
Solution Approach 1:
The system dynamically adjusts braking force distribution based on real-time driver input and collision risk assessment. When the driver steers to avoid a collision, the system dynamically reduces or eliminates braking force on the steered wheel while maintaining or increasing braking force on the opposite wheel, allowing the braking strategy to adapt to the driver's intended maneuver.
Solution Approach 2:
The patent employs asymmetric braking force application across the vehicle's wheels. Instead of symmetric braking on all wheels, the system applies different braking forces to left and right wheels based on the driver's steering input, creating asymmetric force distribution that preserves lateral avoidance capability while maintaining longitudinal collision avoidance effectiveness.
Data Source
AI summary
Provided are collision avoidance apparatus and method for a vehicle, which are capable of maintaining a braking force and assisting a steering force by providing a braking control signal and a steering control signal to a wheel of a driver's steering intention direction during braking for collision avoidance, thereby achieving lateral avoidance. The collision avoidance apparatus for the vehicle includes: a measurement unit configured to measure a motion of an opposite vehicle; and an electronic control unit configured to determine whether there is a risk of collision with the opposite vehicle, based on a measurement result from the measurement unit, and, when it is determined that there is the risk of collision, provide a braking control signal and a steering control signal to an actuator for controlling a wheel of a driver's steering intention direction and provide a braking release signal for releasing a braking force from a wheel opposite to the driver's steering intention direction.