Vehicle Control Unit Standby Entry With Resume-Aware Backup
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Solution Overview
Problem
The existing methods for initiating a standby mode in motor vehicle control units result in delays when there is a 'change of mind' situation, where the ignition is turned on again shortly after being turned off, leading to unnecessary downtime and limited functionality during the transition from normal operating mode to standby mode.
Innovation Solution
A method that involves a two-stage process for switching from normal operating mode to standby mode, where the state management module sends a backup request to applications to store runtime data, and only after a waiting period, checks for a resume request to determine if normal operation should continue or proceed with standby mode, allowing for immediate resumption without suspension if the ignition is turned back on.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the control unit immediately enters standby mode after detecting an ignition-off signal, then energy consumption is reduced, but the system experiences unnecessary delays and functionality limitations when the ignition is quickly reactivated
Solution Approach 1:
The system performs preliminary actions by starting to save runtime data to flash memory before actually entering standby mode. This preparation phase allows the system to be close to standby state without fully committing, enabling quick cancellation if ignition is reactivated. The state management module initiates data saving operations and monitors for ignition-on signals during this transition period, so that if cancellation is needed, only the incomplete save operation needs to be aborted rather than executing the full standby entry sequence.
2Reliability
If the control unit waits for a predetermined period before entering standby mode, then spontaneous reactivation is avoided, but the energy-saving effect is reduced and response time is increased
Solution Approach 1:
The system dynamically adjusts its behavior based on real-time conditions. Instead of using a fixed predetermined waiting period, the state management module continuously monitors for ignition-on signals during the data saving process and can cancel the standby entry at any point. This dynamic approach allows the system to respond quickly to reactivation requests while still performing necessary data preservation, optimizing both reliability and response speed based on actual operating conditions.
3Reliability
If the complete standby mode routine is executed before handling reactivation, then data integrity is ensured, but system responsiveness and user perception of functionality are degraded
Solution Approach 1:
The standby entry process is segmented into distinct phases: data saving preparation, actual data saving to flash memory, and final standby mode entry. The state management module can monitor completion status and cancel the process between these segments. This segmentation allows the system to preserve critical data integrity measures while providing flexibility to abort incomplete operations, thereby maintaining system responsiveness and preventing the perception of functionality loss during quick reactivation scenarios.
Data Source
AI summary
A method for operating a control unit of a motor vehicle, wherein a state management module of a runtime environment initiates a standby mode of the runtime environment as a function of a stop request. The invention provides that, as a function of the stop request, the state management module first sends out to at least one application a respective backup request which requests the respective application to store respective predetermined runtime data in a non-volatile data memory, and then, however, if a resume request is subsequently received within a waiting time period, the normal operating mode is continued without the planned switch-over to the standby mode.