Vehicle Controller Wake-Up Signal for Key-Off Battery Charging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle control systems struggle to initiate scheduled traction battery charge events during key-off states due to communication faults between controllers, which prevent the hybrid powertrain control module from becoming active and initiating charges as scheduled.
Innovation Solution
A controller generates a wake-up signal and activates the ignition relay for a predefined period if the current or voltage is outside a predetermined range, ensuring activation power flows to other controllers, even during key-off, allowing them to perform diagnostic checks and initiate scheduled charge events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the vehicle controller enters low power mode during key-off state, then power consumption is reduced, but communication faults prevent scheduled charge events from being initiated
Solution Approach 1:
The controller enters low power mode before the scheduled charge time, conserving energy during key-off state. However, it performs a preliminary wake-up at the scheduled charge time to check communication status and activate the ignition relay if needed, ensuring charge events can be initiated reliably without maintaining continuous high power state
Solution Approach 2:
The controller dynamically transitions between low power mode and active state based on the scheduled charge event timing. It remains in low power mode during key-off state, then temporarily activates at the scheduled charge time to monitor communication status and initiate charging if conditions are met, optimizing the balance between energy conservation and operational reliability
2Reliability
If the ignition relay is activated continuously to ensure communication reliability, then charge events can be initiated reliably, but power consumption increases during key-off state
Solution Approach 1:
Instead of continuous activation, the ignition relay is activated periodically only at the scheduled charge time during key-off state. The controller wakes up from low power mode at this specific time to check communication status and activate the relay if needed, maintaining reliability while minimizing power consumption during extended key-off periods
Solution Approach 2:
The controller performs a preliminary activation of the ignition relay at the scheduled charge time to ensure communication reliability is established before attempting to initiate the charge event, rather than maintaining continuous activation throughout the key-off state
Data Source
AI summary
A vehicle control system may, during a deactivated state of the vehicle, generate a wake up signal, and responsive to a current or voltage associated with the wake up signal being outside a predetermined range, activate an ignition relay of the vehicle for a predefined period of time. The vehicle control system may further, responsive to a request to activate the vehicle, activate the ignition relay.