Radar Reflector Recognition for Earlier ACC Response to Stopped Vehicles
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Solution Overview
Problem
Adaptive cruise control systems face challenges in timely and accurate detection of stationary objects, particularly when visual confirmation is required, leading to potential unnecessary deceleration or delayed reaction to obstacles like stopped vehicles, due to false radar returns from non-movable objects like guardrails or bridges.
Innovation Solution
Equipping host vehicles with radar reflectors that produce distinctive radar returns indicating a moveable object, allowing trailing vehicles to confirm the presence of obstacles more reliably without visual confirmation, using corner reflectors that rotate at specific rates to signify the object's state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If visual confirmation is required to distinguish stationary objects from moveable objects, then false radar returns from non-movable objects can be filtered out, but reaction time is delayed and unnecessary deceleration occurs
Solution Approach 1:
The radar reflector is pre-equipped on the host vehicle and actively rotates to produce distinctive radar returns before any detection issue arises. This preliminary action of creating identifiable radar signatures enables trailing vehicles to recognize the host vehicle as moveable without requiring visual confirmation, thus resolving the contradiction between reliability and reaction time.
Solution Approach 2:
The rotating radar reflector serves as an intermediary device that mediates between the host vehicle and trailing vehicles' radar systems. By rotating at specific rates, it creates intermediate radar return patterns that convey information about the host vehicle's moveable status, allowing trailing vehicles to make accurate classifications without direct visual observation.
2Measurement precision
If radar reflectors rotate at specific rates to indicate moveable object status, then trailing vehicles can identify host vehicles more accurately, but the system complexity increases
Solution Approach 1:
The radar reflector system utilizes parameter changes in rotation rate to encode different states of the host vehicle. By varying the rotation speed within a limited range, the system conveys multiple pieces of information (moveable status, operational state) using a single mechanical component, thereby achieving high measurement precision without proportionally increasing system complexity.
Solution Approach 2:
The rotating radar reflector serves multiple functions simultaneously: it enhances the host vehicle's radar visibility, communicates moveable object status, indicates operational state through rotation rate, and works passively without requiring power or active electronics on the host vehicle. This multi-functionality achieves high detection precision while minimizing added system complexity.
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
Enables the adaptive cruise control system to take action earlier and more accurately in response to stationary vehicles, reducing unnecessary deceleration and improving reaction time by providing non-visual secondary confirmation of obstacle presence.
Implementation Method 1
a radar reflector of the object, allowing trailing vehicles to confirm the presence of obstacles more reliably
Implementation Method 2
detect, based on the sensor data, an object located along a path of travel of the vehicle... determine that the object is a moveable object based on a radar return of a radar reflector of the object
Data Source
AI summary
A system comprises a computer having a processor and a memory, the memory storing instructions executable by the processor to access sensor data of a sensor of a vehicle while an adaptive cruise control feature of the vehicle is active, detect, based on the sensor data, an object located along a path of travel of the vehicle, determine that the object is a moveable object based on a radar return of a radar reflector of the object, and responsive to the determination that the object is the moveable object, adjust, by the adaptive cruise control feature, the speed of the vehicle.