Test Device for Motor Vehicle Bus Simulation
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Solution Overview
Problem
Standard bus controllers for motor vehicle buses, such as those for FlexRay, have limited message storage capacity, which is insufficient for analysis and simulation purposes, particularly when simulating multiple control devices and actuators, and using multiple controllers to increase capacity is expensive.
Innovation Solution
A test device with a transmission preparation means that inserts additional bus messages into the message memory ahead of the bus controller, allowing for a larger number of bus messages to be sent within a transmission cycle or sequence without expanding the storage capacity, using a standardized bus controller and employing a buffer memory to manage message headers and user data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the message memory storage capacity is increased to store more bus messages, then the transmission capacity is improved, but the device complexity and cost increase
Solution Approach 1:
The system is divided into two functional parts: a standard bus controller with limited message memory (40-70 messages) and an external test device with larger storage capacity. The test device segments the message storage function from the controller, allowing the controller to remain simple while the external device provides extended messaging capabilities for simulation purposes.
Solution Approach 2:
The test device acts as an intermediary between the standard bus controller and the simulation requirements. It provides the additional message storage and management functions that the standard controller lacks, while interfacing with the controller through standard bus protocols. This mediator approach allows using off-the-shelf controllers without modification.
2Quantity of substance
If multiple bus controllers are used to increase transmission capacity, then the message storage capacity is improved, but the cost increases
Solution Approach 1:
The test device is designed as a universal solution that can simulate multiple control devices, actuators, and sensors simultaneously. Rather than requiring multiple physical bus controllers, a single test device with enhanced software capabilities performs the function of multiple controllers, reducing hardware costs while maintaining simulation fidelity.
Solution Approach 2:
The test device creates virtual copies of bus controllers and their message sequences in software. Instead of physically duplicating expensive bus controller hardware, the system uses software-based message memory and transmission preparation that replicates controller behavior, providing the same functional capacity at lower cost.
3Adaptability or versatility
If the message memory is expanded to store additional bus messages, then the simulation capability is improved, but standard bus controllers cannot be used
Solution Approach 1:
The solution moves the extended message storage from the internal message memory dimension to an external test device dimension. The standard bus controller's message memory remains at its native capacity (40-70 messages), but the test device adds another layer of message storage and management, effectively increasing total capacity without modifying the controller's internal architecture.
Solution Approach 2:
The test device performs preliminary actions by pre-loading and preparing bus messages in its external message memory before they are needed by the controller. The transmission preparation means anticipates message requirements and organizes them in advance, allowing the standard controller to operate within its normal memory constraints while the external device provides the extended capability.
Data Source
Figure 1~3
Figure 4~5
AI summary
The testing device (11) has an intermediate storage (38) for storing transmitted data (65) for bus information with a large storage capacity (50) than the information storage (37). The testing device has a transmission preparation unit (40) for readout the transmitted data form the intermediate storage and for registration in the information storage of the bus controller (20). The registration is preemptive for reading the bus controller. An independent claim is also included for a method for testing a motor vehicle-bus.