In-Vehicle Data Processing Apparatus for Band-Constrained Multiplex Transmission
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Solution Overview
Problem
In in-vehicle systems, the multiplex transmission line is overburdened when used for data exchange between ECU units, leading to insufficient communication band for other devices due to the need for wide communication bands to handle intensive data changes, which compromises real-time data transmission requirements.
Innovation Solution
A data processing apparatus with a data receiving section, a first data transmitting section, a second data transmitting section, a condition information storage section, and an event data extracting section, which transmits specific data without delay by utilizing a permitted delay time to prioritize event data transmission, thereby optimizing communication band usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the communication band is widened to handle intensive data changes from I/O devices, then the real-time data transmission is improved, but the communication band available for other devices on the multiplex transmission line is reduced
Solution Approach 1:
The patent implements periodic transmission timing for data from I/O devices, where data is transmitted at predetermined intervals rather than continuously. This periodic action allows the communication band to be shared efficiently between event data transmission and other devices, resolving the contradiction between ensuring real-time data transmission and maintaining communication band availability for other devices on the multiplex transmission line.
2Loss of time
If data is transmitted whenever there is a change in input data, then the real-time property of data transmission is improved, but the communication band consumption increases
Solution Approach 1:
The patent extracts only the necessary event data that requires immediate transmission based on predetermined conditions, rather than transmitting all changed data. By selectively extracting and transmitting only critical event data at predetermined timing, the system reduces communication band consumption while maintaining real-time transmission for important data, thus resolving the contradiction between transmission speed and communication band availability.
3Productivity
If a wide communication band is allocated to the multiplex transmission apparatus, then event data can be transmitted without delay, but the communication band for other devices is insufficient
Solution Approach 1:
The patent implements dynamic communication band allocation where the transmission timing and band usage are adjusted based on the priority and type of data. Event data with predetermined conditions receives transmission priority at specific timing, while other devices share the communication band during non-critical periods. This dynamic approach ensures high productivity for event data transmission while maintaining adaptability for communication band sharing with other devices.
Data Source
AI summary
When a fixed-cycle transmission timing arrives, a fixed-period communication processing section transmits data in a shared memory to a BCM. An event table storage section stores an event table that indicates a condition of data to be transmitted by an event communication processing section and a permitted delay time, which is the period of time permitted starting from when the data satisfying the condition is extracted, until the data is transmitted. An event detecting section extracts the data in the shared memory satisfying the condition indicated by the event table. The event communication processing section transmits to the BCM the data extracted by the event detecting section, before the arrival of the transmission timing of the fixed-period communication processing section, and by the timing at which the permitted delay time elapses from the time of the data extraction by the event detecting section.