LIN Master Controller Sleep Mode Message Segmentation
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Solution Overview
Problem
In Local Interconnect Network (LIN) communication systems, existing technologies face challenges in reducing sleep mode entrance time and diagnosing slave controller failures, particularly when using diagnostic frames, which can lead to delayed power-off and increased power consumption.
Innovation Solution
The implementation of a LIN system and method that allows slave controllers to enter sleep mode via a sleep mode message within an unconditional frame, enabling the master controller to check failure states and reduce sleep mode entrance time by using sleep mode messages to manage the transition and diagnose potential failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diagnostic frames are used for data transmission between master controller and slave controller, then diagnostic functions (memory dump, reprogramming, configuration) can be performed, but information cannot be transmitted when data is transmitted to diagnostic frame and sleep mode entrance time is delayed
Solution Approach 1:
The patent segments the communication frame into two distinct types: diagnostic frames for data transmission and sleep mode messages for power management. This segmentation allows the sleep mode message to be transmitted independently without being blocked by diagnostic frame data transmission, thereby reducing sleep mode entrance time while maintaining diagnostic functionality.
Solution Approach 2:
The patent introduces a dedicated sleep mode message as an intermediary communication mechanism between master and slave controllers. This sleep mode message acts as a separate channel that can trigger sleep mode entry without being affected by diagnostic frame transmissions, resolving the conflict between diagnostic operations and power management timing.
2Reliability
If bus idle state is maintained for about four seconds or more to allow slave controller to check bus status, then slave controller can determine sleep mode readiness, but power consumption increases and system efficiency decreases
Solution Approach 1:
The master controller transmits the sleep mode message in advance to notify the slave controller of the upcoming sleep mode transition. This preliminary action allows the slave controller to prepare for sleep mode without requiring a prolonged bus idle state, thereby reducing power consumption while ensuring reliable bus status checking.
Solution Approach 2:
The slave controller responds to the sleep mode message with an acknowledgment, providing feedback to the master controller. This feedback mechanism enables the master controller to confirm that the slave controller has received and processed the sleep mode command, eliminating the need for extended bus idle states and reducing overall power consumption.
3Reliability
If slave controller continuously monitors bus idle state to determine sleep mode entrance, then sleep mode can be entered, but the monitoring process delays power-off and increases power consumption
Solution Approach 1:
The slave controller autonomously responds to the sleep mode message by sending an acknowledgment and preparing for sleep mode without requiring continuous monitoring of the bus idle state. This self-service approach allows the slave controller to transition to sleep mode efficiently, reducing power-off delay and eliminating the need for prolonged monitoring operations.
Data Source
AI summary
A LIN communication system includes a master controller, and at least one slave controller connected to the master controller via local interconnect network (LIN) communication. The master controller allows the at least one slave controller to enter a sleep mode in a normal situation through a sleep mode message of an unconditional frame provided via the LIN communication and checks a failure state of the at least one slave controller in an abnormal situation.