Adaptive Cruise Control Lateral Acceleration Turn Handling
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Solution Overview
Problem
Current adaptive cruise control (ACC) and stop-and-go ACC systems cause driver discomfort due to unnecessary braking for out-of-path stationary targets and can lead to excessive lateral acceleration during turns, potentially resulting in loss of control.
Innovation Solution
A method and system that determine when a vehicle is in a turn by monitoring lateral acceleration, reducing speed accordingly, and ignoring out-of-path objects to prevent braking, thereby maintaining smooth vehicle control and reducing lateral acceleration within safe limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ACC system brakes for every detected stationary target in the path, then collision avoidance is improved, but driver comfort deteriorates due to unnecessary braking for out-of-path targets
Solution Approach 1:
The patent applies local quality by creating a differentiated response based on target location: targets within the vehicle's path trigger braking, while targets outside the path do not. The controller determines whether detected stationary targets are in-path or out-of-path and selectively applies braking only to in-path targets, thereby maintaining collision avoidance while eliminating unnecessary braking that causes driver discomfort.
2Speed
If ACC system maintains set speed during turns, then response time is improved, but vehicle stability deteriorates due to excessive lateral acceleration
Solution Approach 1:
The patent applies dynamics by making the speed control behavior adaptive to turning conditions. The system dynamically adjusts speed maintenance based on detected lateral acceleration: when lateral acceleration exceeds a threshold indicating a turn, the system allows speed reduction to maintain stability; when lateral acceleration is within normal limits, the system maintains set speed for optimal response time.
3Reliability
If ACC system reduces speed for all detected objects, then safety is improved, but productivity deteriorates due to unnecessary speed reductions in slow traffic
Solution Approach 1:
The patent applies local quality by creating a differentiated response based on target location: targets within the vehicle's path trigger speed reduction, while targets outside the path do not. This selective approach maintains safety for genuine threats while avoiding unnecessary speed reductions that would disrupt traffic flow and reduce productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively reduces driver discomfort by eliminating unnecessary braking and maintaining vehicle stability during turns, preventing accidents caused by excessive lateral acceleration.
Implementation Method 1
at least one lateral acceleration sensor for generating a signal corresponding to the vehicle's lateral acceleration, the lateral acceleration sensor in electrical communication with the controller
Data Source
AI summary
The present invention provides a system and method for enabling a vehicle having adaptive cruise control to reduce its speed in a turn according to the vehicle's position within the turn as well as ignoring objects detected during the turn that are not in the vehicle's path. The method of the present invention includes the steps of operating the vehicle in an adaptive cruise control mode such that the vehicle is traveling at a set speed; determining whether the vehicle is in a turn in the vehicle's path by detecting change in the vehicle's lateral acceleration; and when the vehicle is determined to be in the turn, reducing the vehicle's speed according to the vehicle's position in the turn, monitoring for objects and maintaining the vehicle's speed if an object is positioned out of the path of the vehicle.