In-Vehicle ECU Standby Timing for Lower Network Power Use
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Solution Overview
Problem
Existing in-vehicle network systems face inefficiencies in power consumption due to uniform standby times for ECUs, leading to suboptimal power management and increased energy usage.
Innovation Solution
The system introduces a method where each ECU can be assigned a unique standby time based on its cluster and operational status, with the ability to differentiate and adjust these times dynamically, allowing ECUs to switch between normal and sleep modes based on specific conditions such as communication status and anomalies, thereby optimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a uniform standby time is assigned to all ECUs, then the system operation is simple, but the power consumption cannot be optimized effectively
Solution Approach 1:
The patent applies local quality by assigning different standby times to different ECUs based on their specific functions and communication patterns. Each ECU receives a customized standby time value that matches its operational requirements, rather than using a uniform standby time for all ECUs. This differentiation allows the system to optimize power consumption for each individual ECU while maintaining overall system efficiency.
2Reliability
If the standby time is extended to ensure reliable communication, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the standby time parameter for each ECU based on its communication characteristics and functional importance. By optimizing this time parameter for each individual ECU, the system achieves reliable communication where needed while minimizing power consumption where possible. The standby time is set to the minimum necessary duration for each ECU to complete its communication tasks.
3Use of energy by moving object
If the standby time is reduced to save power, then power consumption is decreased, but communication reliability may be compromised
Solution Approach 1:
The patent ensures that each ECU is assigned a standby time that is locally optimized for its specific communication requirements. ECUs with critical communication functions are assigned longer standby times to ensure reliability, while ECUs with less critical functions receive shorter standby times to maximize power savings. This localized optimization resolves the contradiction between power consumption and communication reliability.
Data Source
AI summary
An in-vehicle network system includes: first processors connected to a bus that is applied to a partial network; and a second processor. Each of the first processors or the second processor send at least one of the first processors in the sleep mode to switch them to the normal mode. Each of the first processors is configured to: assign at least one standby time to each of the first processors and differentiate a standby time assigned to at least one of the first processors from a standby time assigned to other of the first processors, start measuring one of the standby times when sending or receiving one of the NM messages and determine whether or not the standby time has elapsed, and switch at least one of the first processors in which all of the standby times have been determined to have elapsed, to the sleep mode.