Vehicle Communication System Ignition-Off Wake-Up Control
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Solution Overview
Problem
Current vehicle communication systems incur unnecessary operations and increased dark current consumption by requiring multiple electronic control devices to wake up for network management during ignition-off, making it difficult to perform specific tasks without waking up unnecessary controllers.
Innovation Solution
A method and system where a main controller selectively wakes up a specific sub-controller during ignition-off, scheduling wake-up times and tasks without using network management, allowing for tasks like software reprogramming or diagnosis to be performed efficiently, minimizing unnecessary wake-ups and dark current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If network management (NM) packets are used to wake up a specific electronic control device, then communication can be resumed, but multiple electronic control devices connected to the bus must also wake up, causing unnecessary operations and increased dark current consumption
Solution Approach 1:
The patent extracts the wake-up signaling function from the standard NM packet protocol. Instead of using NM packets that trigger bus-wide wake-up, the system uses a dedicated wake-up message format that can be selectively received only by the intended target controller, thereby separating the wake-up function from the communication resumption function and avoiding unnecessary bus activations.
Solution Approach 2:
The patent introduces a wake-up message as an intermediary between the main controller and the target sub-controller. This intermediary message carries wake-up instructions and task information, enabling precise targeting without requiring other controllers on the bus to wake up, thus mediating between the need for communication resumption and the need to minimize energy consumption.
2Reliability
If multiple electronic control devices wake up for network management, then communication can be established, but unnecessary operations occur, reducing system efficiency
Solution Approach 1:
The patent extracts the wake-up signaling function from the standard NM packet protocol. Instead of using NM packets that trigger bus-wide wake-up, the system uses a dedicated wake-up message format that can be selectively received only by the intended target controller, thereby separating the wake-up function from the communication resumption function and avoiding unnecessary bus activations.
Solution Approach 2:
The patent implements preliminary action by having the main controller send a wake-up message before actual communication tasks. The wake-up message is transmitted in advance to notify the target sub-controller to wake up and prepare for subsequent communication, ensuring that only necessary controllers are activated before tasks are assigned.
3Reliability
If network management is used for wake-up, then communication can be resumed, but it is difficult to perform specific tasks without waking up unnecessary controllers
Solution Approach 1:
The patent merges the wake-up function and the task assignment function into a single wake-up message. The message contains both wake-up instructions and task information, allowing the target controller to wake up and immediately know what task to perform, thereby combining two functions that were previously separate (wake-up via NM packet and subsequent task assignment).
Solution Approach 2:
The patent introduces a wake-up message as an intermediary between the main controller and the target sub-controller. This intermediary message carries wake-up instructions and task information, enabling precise targeting without requiring other controllers on the bus to wake up, thus mediating between the need for communication resumption and the need to minimize energy consumption.
Data Source
AI summary
A method for controlling a communication system of a vehicle includes selecting, by a main controller, a specific sub-controller to wake-up during an ignition-off state of the vehicle from among a plurality of sub-controllers. The main controller transmits a message including information about a time when the wake-up is scheduled and a specific task to be performed after the wake-up to the selected specific sub-controller if the ignition-off state of the vehicle is maintained. The selected sub-controller is caused to wake up at the wake-up time transmitted from the main controller and to perform the specific task during the ignition-off state of the vehicle. A corresponding communication system of the vehicle is also provided.