Vehicle Control Unit Testing With Synchronized Sensor Simulation
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Solution Overview
Problem
Conventional methods for simulating the reaction of a control unit to surrounding-area data from surround sensors in vehicles suffer from temporal offsets between motion data and surrounding-area data simulation, leading to unreliable testing of functions like parking assistants and emergency braking assistants.
Innovation Solution
A method and system that synchronize motion data and surrounding-area data transmission by using a sensor testing unit connected to a programmable computer device, where calculated surrounding-area data are transmitted via a separate circuit from the vehicle data bus, ensuring temporal synchronization and realistic testing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If motion data and surrounding-area data are transmitted through the same vehicle data bus, then device complexity is reduced, but temporal synchronization between the two data types deteriorates
Solution Approach 1:
The data transmission system is segmented into two separate paths: the vehicle data bus for motion data and a dedicated sensor-data transmission circuit for surrounding-area data. This segmentation allows each transmission path to be optimized independently, ensuring temporal synchronization for sensor data while maintaining overall system manageability.
Solution Approach 2:
A sensor testing unit is introduced as an intermediary component that receives surrounding-area data from the simulation environment and transmits it through a dedicated circuit to the control unit. This intermediary ensures proper timing and synchronization of sensor data transmission separate from the general vehicle data bus traffic.
2Reliability
If a separate sensor-data transmission circuit is used for surrounding-area data, then temporal synchronization is improved, but device complexity increases
Solution Approach 1:
The transmission system is divided into two functional segments: the existing vehicle data bus handling motion data and a dedicated sensor-data transmission circuit for surrounding-area data. This segmentation isolates critical sensor data transmission from general data traffic, ensuring temporal synchronization without requiring complete system redesign.
Solution Approach 2:
The sensor testing unit serves multiple functions: it generates surrounding-area data from the simulation environment, manages the dedicated transmission circuit, and interfaces with the control unit. This multi-functionality reduces the need for additional separate components, mitigating the increase in device complexity.
3Adaptability or versatility
If simulation of vehicle movement and surrounding area is performed, then testing realism is improved, but temporal offsets between motion data and sensor data occur
Solution Approach 1:
The system performs preliminary synchronization by having the sensor testing unit receive and process surrounding-area data in advance, preparing it for transmission at the correct temporal moment. This preliminary action ensures that when motion data and sensor data are transmitted, they are properly synchronized without temporal offsets.
Solution Approach 2:
The sensor testing unit acts as an intermediary that coordinates between the simulation environment and the control unit, managing the timing and synchronization of data transmission. This intermediary ensures that surrounding-area data and motion data are transmitted in proper temporal sequence, eliminating offsets caused by independent simulation processes.
Data Source
AI summary
Methods for testing a control unit of a vehicle. The control unit obtains calculated surrounding-area data of a simulated surround sensor, and obtains calculated motion data of a simulated vehicle. The calculated motion data are transmitted to the control unit via a simulated vehicle data bus. Using a sensor testing unit, the calculated surrounding-area data are transmitted to the control unit via a sensor-data transmission circuit different from the vehicle data bus. To execute a simulated acquisition of surrounding-area data, using the control unit, a command for executing a measurement is transmitted to the sensor testing unit, data for identifying the position of the simulated surround sensor is transmitted to the computer device, positions of points of reflection by simulated objects in the surrounding area of the vehicle are calculated and transmitted to the sensor testing unit, and calculated surrounding-area data are determined and transmitted to the control unit.