Adaptive Cruise Control Overtaking Safety Logic
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Solution Overview
Problem
Adaptive cruise control systems face challenges in managing vehicle acceleration when overtaking scenarios occur, leading to potential dangerous situations due to undesired acceleration of the host vehicle when a faster vehicle overtakes a slower one in front of it.
Innovation Solution
The adaptive cruise control system employs object detecting means to establish distance and velocity values for multiple target objects, generating separate control orders to maintain the host vehicle's speed and distance, with processing means prioritizing the most restrictive control order to avoid unsafe acceleration by adjusting the vehicle's speed based on the velocity of the vehicle in front of another target object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the adaptive cruise control system accelerates the host vehicle back to the set vehicle velocity when a target object is detected, then the host vehicle returns to its desired speed, but the host vehicle may get undesirably close to another target object being overtaken, creating a dangerous situation
Solution Approach 1:
The system segments the detection field into multiple zones and identifies multiple target objects independently. When multiple target objects are detected, the system generates separate control orders for each target object and selects the most restrictive one, ensuring that acceleration decisions consider all detected vehicles rather than just the closest one.
Solution Approach 2:
The system performs preliminary detection and identification of multiple target objects before executing acceleration commands. By detecting and evaluating all target objects in advance, the system can predict potential safety issues and adjust acceleration decisions accordingly, preventing the host vehicle from getting too close to any target object.
2Reliability
If the adaptive cruise control system detects multiple target objects and generates separate control orders, then the system can select the most restrictive control order to prevent unsafe acceleration, but the system complexity increases
Solution Approach 1:
Instead of selecting the control order that maintains the set vehicle velocity, the system inverts the selection criterion to choose the control order that gives the slowest velocity. This inversion simplifies the selection logic by always choosing the most restrictive control order, which inherently prioritizes safety over speed recovery.
Solution Approach 2:
The system uses the existing object detecting means and control order generation capabilities already present in the adaptive cruise control system. By reusing existing components and simply adding the selection logic for multiple control orders, the system achieves enhanced safety without requiring entirely new subsystems.
Data Source
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AI summary
The invention relates to an adaptive cruise control system and a method for controlling the velocity of a motor vehicle, here denominated host vehicle. The system comprises object detecting means capable of simultaneously detecting several target objects. A separate control order is generated for each detected target object for influencing engine control means and brake control means of the host vehicle so as to thereby control the velocity of the host vehicle. The control orders generated for several simultaneously detected target objects are then compared and the most restrictive control order among these is selected. At least one control signal based on the selected control order is then sent to at least one of the engine control means and the brake control means of the host vehicle so as to thereby control the velocity of the host vehicle in accordance with the selected control order.