Retractable ADAS Test Target Frame with Guide Rail
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Solution Overview
Problem
Existing test devices for advanced driver assistance systems (ADAS) face challenges with reusable and secure targets, as destructible targets are costly and pose risks of damage to vehicles and drivers due to pendulum movements after impacts.
Innovation Solution
A test device with a frame secured to a support arm, capable of moving from a detectable to a retracted position using active drive means like springs and a counterweight, ensuring the frame does not fall on the vehicle, featuring a bistable mechanism for robust and safe operation at high speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reusable target mounting frame is used instead of destructible targets, then test cost is reduced and testing can be repeated, but the frame poses a risk of falling back onto the vehicle after impact causing damage and danger to the driver
Solution Approach 1:
The patent extracts the harmful swinging motion by introducing a guide rail that constrains the mounting frame to move only along the vertical axis. This prevents the frame from swinging backward onto the vehicle after impact, eliminating the damage risk while preserving reusability.
Solution Approach 2:
The guide rail acts as an intermediary mechanism between the mounting frame and the vehicle body. It mediates the impact forces by providing a controlled linear movement path, preventing direct contact between the swinging frame and the vehicle, thus protecting both the vehicle and driver.
2Strength
If the mounting frame is allowed to swing freely to absorb impact energy, then the frame can withstand higher impact forces, but the swinging motion creates danger to the driver and vehicle damage risk
Solution Approach 1:
The patent removes the harmful lateral swinging component of the impact response by constraining motion to the vertical axis only. The guide rail extracts the dangerous rotational movement while allowing the frame to still absorb impact energy through controlled linear displacement.
Solution Approach 2:
The guide rail system provides beforehand cushioning by allowing the mounting frame to move linearly along a controlled path during impact. This pre-planned movement path absorbs impact energy safely without creating unpredictable swinging motions that could endanger the driver.
3Object-affected harmful factors
If the frame is constrained to move only vertically along a guide rail, then driver safety is improved by preventing frame swing-back, but the complexity of the mounting system increases
Solution Approach 1:
The patent extracts only the essential harmful motion (lateral swinging) while preserving the necessary functionality (vertical movement for target positioning and impact absorption). The guide rail removes unnecessary degrees of freedom, simplifying the control of frame movement while maintaining safety.
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 device allows for safe and cost-effective testing at high speeds by preventing the frame from damaging the vehicle and ensuring driver safety, while being reusable and adaptable to different test scenarios.
Implementation Method 1
the active drive means include at least one spring fixed on one side to the support arm and on the other side to the frame, said spring defining a critical position relative to which, on one side the spring returns the frame to the detectable position and on the other side the spring returns the frame to the retracted position
Implementation Method 2
the active drive means may include a counterweight installed opposite the frame relative to the support arm. Thus, the weight exerted by this counterweight, acting in conjunction with the restoring force of the springs, allows the frame to be actively driven into the retracted position and then held in that retracted position
Data Source
Figure 1
Figure 2~3
Figure 4a~6
AI summary
The invention relates to a test device for a motor vehicle equipped with an advanced driver assistance system comprising a target mounting frame (10), a support arm (12), the frame (10) being rotationally mounted to the support arm (12) about an axis of rotation (25') parallel to said support arm (12), the frame (10) being able to move from a detectable position (10a), in which the target is detectable by the vehicle being tested, to a retracted position (10b), in which the target is invisible to the detection system of the vehicle being tested, characterized in that it comprises active drive means (35, 26) able to force the frame (10) to move from the detectable position (10a) to the retracted position (10b) and means for retaining the frame (35, 26) in the retracted position.