Vehicle Master Device Update Data Distribution Control
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Solution Overview
Problem
During vehicle program rewriting, the increased amount of application data for controlling or diagnosing vehicles can lead to data loss due to exceeding the allowable transmission amount on the bus, particularly when the vehicle is in transit, resulting in potential loss of application or update data.
Innovation Solution
A vehicle master device is configured to acquire update data and distribute it to a rewrite target electronic control unit (ECU) based on a specified distribution frequency, which is determined by the correspondence between predetermined vehicle power supply states and transmission restriction information, thereby controlling the data distribution to prevent loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If update data is distributed continuously to rewrite target ECU, then update speed is improved, but data loss occurs due to exceeding allowable transmission amount on bus
Solution Approach 1:
The patent applies periodic action by distributing update data in controlled intervals rather than continuously. The distribution frequency specifying unit determines optimal distribution timing based on vehicle power supply states, creating periodic distribution cycles that prevent bus transmission overload while maintaining update progress. This resolves the contradiction by balancing update speed with data loss prevention through time-based segmentation of data transmission.
Solution Approach 2:
The patent implements dynamics by making the distribution frequency adaptive to changing vehicle conditions. The distribution frequency specifying unit dynamically adjusts distribution parameters based on detected power supply states (e.g., engine running, idle, parked). This allows the system to optimize between update speed and reliability in real-time, increasing distribution frequency when conditions permit and reducing it when data loss risk increases.
2Adaptability or versatility
If application data amount is increased for vehicle control and diagnosis, then functional capability is improved, but transmission reliability deteriorates due to bus capacity limits
Solution Approach 1:
The patent applies segmentation by dividing the vehicle system into multiple ECU units, each handling specific control or diagnosis functions. Update data is segmented and distributed to individual rewrite target ECUs separately rather than as a single large transmission. This reduces the burden on the bus at any given time while maintaining comprehensive functional capability across the distributed ECU network.
Solution Approach 2:
The patent uses periodic action to manage data transmission loads by implementing scheduled distribution cycles for different ECUs. The system alternates between distributing update data to different target ECUs in sequence, with distribution frequency adjusted based on power supply states. This periodic, staggered approach allows increased overall data transmission for enhanced functionality while preventing bus overload that would cause transmission failures.
Data Source
AI summary
A vehicle master device is configured to acquire update data from outside and distribute the acquired update data to a rewrite target electronic control unit (ECU). The vehicle master device includes a distribution frequency specifying unit that is configured to specify a distribution frequency of the update data to the rewrite target ECU based on a correspondence relationship between a predetermined vehicle power supply state and transmission restriction information related to distribution of the update data and a vehicle power supply state during updating, and a distribution control unit that is configured to control distribution of the update data according to the distribution frequency specified by the distribution frequency specifying unit.