Radar Sensor Test Assembly with Laser Alignment and Blocking Mechanism
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Solution Overview
Problem
The functional testing of radar sensors in motor vehicles during production is challenging due to the need for adjustment and safety concerns regarding microwave radiation exposure, as well as spatial constraints that prevent field testing, and existing methods do not allow for efficient adjustment and testing without activating the sensors.
Innovation Solution
A test arrangement using laser sources and adjustment means to align a radar sensor with a traverse, allowing for precise adjustment and testing without emitting radar beams, and a programmable control unit to verify the sensor's functionality and prevent uncontrolled radiation, enabling automated or partially automated testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the radar sensor is activated for functional testing during production, then the functionality can be verified, but hazardous microwave radiation is emitted posing safety risks to production personnel
Solution Approach 1:
A blocking mechanism is introduced as an intermediary component between the radar sensor and the environment. This mechanism prevents microwave radiation from being emitted during production and testing phases, while allowing the sensor to be activated for functional verification. The blocking mechanism is subsequently removed or deactivated after successful testing, enabling normal operation.
Solution Approach 2:
The functional testing of the radar sensor is performed in advance during the production process, before the vehicle is delivered to the customer. By conducting the test preliminarily and removing the blocking mechanism only after successful verification, the system ensures functionality is confirmed before normal operation begins, preventing both safety hazards and the need for recall.
2Productivity
If the radar sensor is activated early during production, then functionality can be tested sooner, but adjustment time is increased
Solution Approach 1:
The radar sensor is pre-adjusted to a defined position during assembly, before functional testing begins. This preliminary positioning ensures that when the sensor is activated, it is already in the correct orientation, allowing immediate functional verification without time-consuming adjustments during the testing phase.
Solution Approach 2:
The system allows for dynamic adjustment of the radar sensor's position and orientation. Adjustment devices can modify the sensor's angular position during assembly or testing, enabling quick corrections if needed while maintaining the ability to perform rapid functional tests once the basic position is set.
3Reliability
If field testing is performed to verify radar sensor functionality, then comprehensive functional verification is possible, but spatial constraints during production make it impossible
Solution Approach 1:
The essential functional testing requirements are extracted from complex field testing conditions and implemented in a simplified production environment. By using a blocking mechanism that can be removed and a defined adjustment position, the system achieves comprehensive functional verification without requiring external field conditions, large spaces, or complex test setups.
Solution Approach 2:
Instead of performing actual field tests that require external environments, the system creates a controlled copy of the operational conditions within the production facility. The blocking mechanism and adjustment devices replicate the necessary test conditions, allowing functional verification to be performed in the production environment rather than requiring separate field testing infrastructure.
4Manufacturing precision
If the radar sensor is adjusted manually during production, then precise positioning can be achieved, but the adjustment process becomes complex and time-consuming
Solution Approach 1:
The radar sensor is pre-positioned at a defined adjustment position during assembly, which simplifies the adjustment process. This preliminary positioning ensures that the sensor starts from a known, correct orientation, reducing the complexity of subsequent adjustments and minimizing the time required to achieve precise positioning.
Solution Approach 2:
Adjustment devices are provided that can dynamically modify the radar sensor's position and orientation. These devices allow for straightforward angular adjustments during assembly or testing, enabling precise positioning through simple mechanical or motorized mechanisms rather than complex multi-axis adjustment systems.
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
Ensures the radar sensor is reliably adjusted and tested without emitting radiation during production, preventing hazardous exposure and interference, and identifies non-functional sensors to avoid costly rework, while ensuring operational readiness for driver assistance systems.
Implementation Method 1
two first laser sources (4, 4') are arranged on an unsteered axle (22) of the motor vehicle (1)
Implementation Method 2
a radar sensor (2) arranged at the front (5) of the motor vehicle (1)
Implementation Method 3
at least one radar reflector (14) is arranged on the crossbeam (7) at a defined distance and with a defined directional orientation
Data Source
Figure 1
Figure 2
AI summary
Test setup and method for ensuring the functional reliability of a radar sensor (2) installed at the front (5) or rear (6) of a motor vehicle (1), in particular a commercial vehicle, during the production process of the motor vehicle (1), wherein the test setup can be aligned with the axis of rotation (3) of a non-steered axle (22) of the motor vehicle (1) by means of laser sources (4, 4') and first target marks (8, 8') arranged on a crossbeam (7) that interact with these laser sources. First adjustment means (9) are arranged on the crossbeam (7), which is opposite the radar sensor (2), and which interact with second adjustment means (10) arranged on the radar sensor (2) such that the radar sensor (2) can be aligned with the motor vehicle (1) and thus with the radar sensor (2) in such a way that a predetermined radiation pattern is achieved during subsequent operation of the radar sensor (2).Furthermore, at least one radar reflector (14, 19, 20) with a defined retroreflective characteristic is arranged on the traverse (7), wherein the test setup includes first means by which, after adjustment of the radar sensor (2), a block that prevents the emission of radar beams can be released. The test setup also includes second means that compare whether the radar echo reflected back from the at least one radar reflector (14, 19, 20) to the radar sensor (2) and received by it lies within a permissible range. Finally, the test setup includes third means that respond to the comparison and switch the radar sensor (2) into a standby state if the radar echo received by the radar sensor (2) lies within a permissible range, and otherwise deactivate it.