Motor Vehicle Data Bus Segment Wake-Up Control
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Solution Overview
Problem
Existing data bus systems in motor vehicles consume excessive energy as all controllers are often kept active, even when only a few are required for communication, leading to inefficient energy usage and high loading on controllers.
Innovation Solution
A two-stage wake-up mechanism for data bus segments, where only necessary segments are activated, and all other segments are woken up only when communication is required between controllers on different segments, using a gateway controller to manage the wake-up process and reduce unnecessary energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all controllers are kept active to ensure communication readiness, then communication reliability is improved, but energy consumption increases
Solution Approach 1:
The data bus system is divided into multiple segments, each with its own gateway controller. Controllers are grouped into segments based on communication patterns, allowing selective activation of only those segments needed for current communication requirements. This segmentation enables the system to maintain communication reliability within active segments while keeping other segments in low-power states.
Solution Approach 2:
The system dynamically adjusts the operational state of controllers and data bus segments based on real-time communication requirements. Gateway controllers monitor communication needs and wake up or put to sleep controllers as needed, transforming the static all-active configuration into a dynamic, adaptive system that balances reliability and energy consumption.
2Speed
If all controllers are kept active, then communication speed is improved, but loading on controllers increases
Solution Approach 1:
By segmenting the data bus system and keeping only necessary controllers active, the communication path is optimized to involve fewer controllers. This reduces the processing load on individual controllers while maintaining communication speed within the active segments, as data transmission occurs only between wakeful controllers rather than requiring coordination across all controllers.
Solution Approach 2:
Gateway controllers serve as intermediaries between different data bus segments. They manage the wake-up and sleep states of controllers within their segments and handle data routing between segments. This intermediary role distributes the management complexity away from individual controllers, reducing their loading while preserving communication efficiency.
3Ease of operation
If data bus segments are kept in awake state, then communication readiness is improved, but energy consumption increases
Solution Approach 1:
Different data bus segments are assigned different operational states based on their specific communication requirements. Instead of uniformly keeping all segments awake, the system applies local quality by waking up only those segments that currently need to communicate, allowing other segments to enter low-power states while maintaining overall system readiness where needed.
Solution Approach 2:
The system employs periodic monitoring and wake-up cycles where gateway controllers assess communication requirements and activate segments only when necessary. This periodic action pattern allows segments to alternate between sleep and awake states, maintaining communication readiness on demand while minimizing energy consumption during periods of inactivity.
Data Source
AI summary
An apparatus for operating a data bus system of a motor vehicle having data bus segments, at least one of the data bus segments is designed to switch from an active state to a rest state and vice versa. In a first step, a communication requirement is detected of a first control device of a first data bus segment in the rest state. If a communication requirement of the first control device is detected, the first data bus segment is brought from the rest state into the active state. If a communication requirement of the first control device with a second control device outside of the first data bus segment is detected, all other data bus segments of the data bus system outside of the first data bus segment that are in the rest state are additionally activated across the board.