Vehicle ECU Self-Retention Power for Rewrite Completion
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Solution Overview
Problem
Existing vehicle electronic control systems face challenges in completing program rewriting efficiently, especially when vehicle power is turned off during rewriting, leading to incomplete program updates due to limited time for vehicle travel.
Innovation Solution
A vehicle master device is configured to determine vehicle power status and program rewriting progress, and it instructs a vehicle slave device to enable a self-retention power circuit when necessary, ensuring power is secured for completing program rewriting even when vehicle power is off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the vehicle power is turned off during program rewriting, then power consumption is reduced, but the program rewriting cannot be completed
Solution Approach 1:
The master device predicts the required rewriting time before initiating the program rewriting process, and compares it with the predicted vehicle travel time. This preliminary assessment ensures that rewriting is only started when conditions are favorable, preventing power interruption during the process and ensuring reliable completion while managing power consumption efficiently.
Solution Approach 2:
The system dynamically adjusts the rewriting execution decision based on real-time conditions. The master device continuously monitors vehicle travel time predictions and rewriting time requirements, making adaptive decisions about whether to proceed with rewriting. This dynamic approach allows the system to optimize between power consumption and rewriting completion reliability based on current vehicle usage patterns.
2Productivity
If the vehicle travel time is limited, then the vehicle usage efficiency is improved, but the program rewriting cannot be completed due to insufficient time
Solution Approach 1:
The system performs preliminary prediction of both the rewriting time required and the vehicle travel time available before initiating rewriting. This advance planning allows the system to identify suitable time windows for rewriting that do not conflict with vehicle usage requirements, ensuring both efficient vehicle utilization and successful rewriting completion.
Solution Approach 2:
The master device uses feedback from travel time predictions and rewriting progress to make informed decisions. By continuously monitoring whether the predicted travel time is sufficient for the predicted rewriting time, the system can adjust its rewriting execution strategy, ensuring that rewriting operations are scheduled during appropriate time windows without compromising vehicle productivity.
Data Source
AI summary
In a vehicle electronic control system, a vehicle master device includes a vehicle power determination unit that is configured to determine a vehicle power is on, a rewrite-in-progress determination unit that is configured to determine whether rewriting of a program is in progress, a first self-retention power determination unit that is configured to determine whether it is necessary to self-retain power in the vehicle slave device when the vehicle power determination unit determines that the vehicle power is off and when the rewrite-in-progress determination unit determines that rewriting of the program is in progress, and a self-retention power instruction unit that is configured to instruct the vehicle slave device to enable the first self-retention power circuit when the first self-retention power determination unit determines that it is necessary to self-retain the power in the vehicle slave device. The vehicle slave device is configured to enable the first self-retention power circuit when the vehicle master device instructs to enable the first self-retention power circuit.