Driver Assistance Apparatus Exit Ramp Speed Control
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Solution Overview
Problem
Advanced driver assistance systems (ADAS) face challenges in safely navigating vehicles around exit ramps, particularly in preventing rear-end collisions and maintaining traffic flow, as they may reduce vehicle speed excessively or inadequately when approaching exit ramps.
Innovation Solution
A driver assistance apparatus and method that utilize a navigation device, detector, and processor to determine the vehicle's travel lane, identify a control target point on the exit ramp, calculate a target pre-deceleration speed based on road curvatures and safety speeds, and control the vehicle's speed to prevent collisions and maintain traffic flow by adjusting acceleration and deceleration accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the NSCC reduces vehicle speed to the curved section safety speed of the exit ramp, then the vehicle can safely travel on the curved road, but the vehicle may be at risk for rear-ended collision and impede traffic flow when the driver wants to continue on the main road
Solution Approach 1:
The system applies different deceleration control strategies to different travel lanes. The processor determines the vehicle's travel lane and applies pre-deceleration control only to the outermost lane when an exit ramp is detected, while other lanes maintain normal speed control. This localized application of deceleration resolves the contradiction by ensuring safety for vehicles actually entering the curved exit ramp while preventing harmful effects for vehicles continuing on the main road.
Solution Approach 2:
The system performs pre-deceleration control by reducing vehicle speed in advance before the vehicle reaches the exit ramp's curved section. The processor calculates a target pre-deceleration speed and controls the vehicle to reach this speed at a predetermined distance from the exit ramp. This preliminary speed reduction allows smooth transition into the curved section without sudden braking, thereby preventing rear-ended collisions while maintaining safety.
2Reliability
If the NSCC reduces vehicle speed without limitation to reach the curved section safety speed, then the vehicle can enter the exit ramp safely, but the traffic flow on the main road is impeded
Solution Approach 1:
The system selectively applies speed reduction only to the outermost lane where exit ramp entry is possible, while allowing other lanes to maintain higher speeds. This localized deceleration control ensures that traffic flow on the main road is not unnecessarily impeded, while still achieving safe entry speeds for vehicles actually transitioning to the exit ramp.
Solution Approach 2:
The system performs deceleration in advance at a controlled rate before the exit ramp, allowing vehicles to gradually reduce speed rather than suddenly braking at the ramp entrance. This preliminary action maintains smoother traffic flow on the main road while still achieving the required safety speed for curved section travel.
3Reliability
If the vehicle speed is reduced to the curved section safety speed, then the vehicle can safely navigate the curved road, but the vehicle may exceed the speed limit of the main road
Solution Approach 1:
The system performs pre-deceleration control by reducing vehicle speed in advance before reaching the exit ramp. The processor determines a target pre-deceleration speed that is lower than both the main road speed limit and the curved section safety speed, ensuring the vehicle enters the exit ramp at a safe speed without exceeding the main road speed limit during the deceleration process.
Solution Approach 2:
The system dynamically adjusts the target speed based on the vehicle's current speed, the distance to the exit ramp, and the required safety speed. The processor calculates the required acceleration and controls the vehicle to reach the target pre-deceleration speed at the appropriate location, ensuring compliance with speed limits while achieving safe curved section navigation.
Data Source
AI summary
The present disclosure relates to a driver assistance apparatus and a method for operating the same. The driver assistance apparatus includes a navigation device that provides a guide route and road information, a detector that measures information regarding surroundings of a vehicle, and a processor that performs a deceleration control for entrance to an exit ramp, based on the information obtained through the navigation device and the detector.