AEBS Test Device Using BeiDou Time Reference
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Solution Overview
Problem
There is a lack of a detailed test and evaluation method for Type-II Autonomous Emergency Braking Systems (AEBS) with vehicle-road communication function, as existing standards only specify performance requirements and test scenarios without describing a comprehensive testing process.
Innovation Solution
A Type-II AEBS test and evaluation device based on a BeiDou space-time reference is developed, comprising a roadside-end information acquisition module, a vehicle-end information acquisition module, and an integrated information processing module, which measures vehicle-road communication delay and warning signal sending time using multi-target sensor fusion technology, including high-precision time synchronization and dynamic interpolation methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a type-II AEBS with vehicle-road communication function is implemented, then the system can provide warning in all-weather and all-terrain conditions, but there is a lack of detailed test and evaluation method to verify its performance
Solution Approach 1:
The test and evaluation system is segmented into three independent modules: roadside-end information acquisition module, vehicle-end information acquisition module, and integrated information processing module. Each module has specific functions and can be independently configured and tested, allowing comprehensive verification of the type-II AEBS performance in various conditions without requiring a complete system overhaul for each test scenario.
Solution Approach 2:
The integrated information processing module acts as an intermediary that receives data from both roadside-end and vehicle-end modules, processes the information, and generates evaluation results. This intermediary component enables the system to verify communication delays and warning timing by mediating between the road-side infrastructure and vehicle systems, ensuring reliable test and evaluation capability.
2Measurement precision
If multi-target sensor fusion technology is used to measure communication delay and warning timing, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The test and evaluation device uses multi-target sensor fusion technology where multiple sensors (BeiDou satellite receiving device, inertial navigation device, audio and vibration sensors) serve multiple functions. These sensors not only measure communication delay and warning timing but also provide position, velocity, and environmental information, reducing the need for separate dedicated measurement devices and thereby managing complexity while maintaining high precision.
Solution Approach 2:
The system employs self-service mechanisms where the vehicle-end and roadside-end modules automatically synchronize time using BeiDou satellite signals and inertial navigation data. The integrated information processing module automatically processes raw sensor data, calculates communication delays, determines warning timing, and generates evaluation reports without requiring external intervention, thereby simplifying operation despite the complex multi-sensor architecture.
3Measurement precision
If high-precision time synchronization using BeiDou space-time reference is implemented, then warning issuing time measurement accuracy is improved, but the requirement for specific communication system and data protocol increases device complexity
Solution Approach 1:
The system performs preliminary time synchronization by pre-configuring the roadside-end and vehicle-end modules with BeiDou satellite receiving devices and inertial navigation devices. These components continuously acquire and synchronize time information from BeiDou satellites before actual AEBS operations, ensuring that high-precision time stamps are already available when communication and warning events occur, thereby simplifying the measurement process without requiring complex real-time synchronization protocols.
Data Source
AI summary
Disclosed are a Type-II Autonomous Emergency Braking System (AEBS) test and evaluation device and method based on a BeiDou space-time reference, where the device includes three parts: a roadside-end information acquisition module, a vehicle-end information acquisition module, and an integrated information processing module. The roadside-end information acquisition module can acquire accurate message sending time by means of a BeiDou time service unit: the vehicle-end information acquisition module can acquire accurate time of receiving a roadside-end message, information acquired by a combined inertial navigation unit, and audio/vibration information acquired by a Single Chip Microcomputer (SCM) embedded unit; and the integrated information processing module can implement accurate, quantitative test and evaluation of indexes such as a vehicle-road communication delay and warning signal sending time. The method of the present disclosure performs data analysis and processing based on a globally unified BeiDou space-time reference and by means of a Support Vector Machine (SVM)-based dynamic Hermite interpolation method, which has an accurate test and evaluation result. Further, the method does not have any requirements for a communication system of the type-II AEBS, thus achieving convenient testing and a wide range of application.