Vehicle Controller Wake-Up Detection for Battery Discharge Diagnosis
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Solution Overview
Problem
Existing vehicle systems struggle to identify the cause of parasitic current discharge from a low-voltage battery due to controllers waking up unexpectedly, leading to continuous discharge and inefficient detection of non-sleep controllers, which increases costs and analysis time.
Innovation Solution
A system and method that includes a powernet domain controller with a sensor and processor to detect changes in current consumption, identify the first wake-up controller, and monitor sleep states of vehicle controllers, storing the cause of discharge for output through a display or sound device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If controllers are supplied with power through a low-voltage battery to enable start-on/off operation and convenience device operation, then the vehicle can operate various devices, but parasitic currents increase causing battery discharge
Solution Approach 1:
The system performs preliminary detection of current changes to identify wake-up controllers before they cause significant parasitic current. By detecting the initial current change and tracing it to the specific controller that woke up, the system can take preventive action to put other controllers to sleep, thereby preventing battery discharge before it occurs.
Solution Approach 2:
The system implements a feedback mechanism where the detection of current changes triggers an investigation to identify the wake-up controller. Based on this feedback, the system communicates with controllers over the network to determine their sleep status and takes corrective action. This closed-loop feedback allows the system to adapt and prevent parasitic current discharge.
2Measurement precision
If the communication state of devices is monitored to detect non-sleep controllers, then the cause of battery discharge can be identified, but the monitoring fails continuously and the first wake-up controller cannot be identified
Solution Approach 1:
Instead of relying on continuous monitoring that may fail, the system performs preliminary detection of current changes as soon as a controller wakes up. This preliminary action captures the wake-up event at its inception, ensuring the first wake-up controller is identified before communication failures or monitoring gaps occur.
Solution Approach 2:
The system replaces unreliable continuous communication-based monitoring with a more reliable current-based detection mechanism. By using electrical current sensing as the primary detection method and only using communication as a secondary verification tool, the system achieves more reliable identification of wake-up controllers.
3Loss of information
If traditional methods are used to analyze the cause of battery discharge, then analysis can be performed, but costs and time spent are excessive
Solution Approach 1:
The system performs self-diagnosis by automatically detecting current changes, identifying the wake-up controller, checking its sleep status, and determining the cause of parasitic current discharge without requiring external intervention. This self-service capability eliminates the need for costly and time-consuming manual analysis while accurately identifying the problem cause.
Solution Approach 2:
The system rapidly skips through the analysis process by directly detecting current changes and immediately tracing them to the specific controller. Instead of performing lengthy traditional analysis procedures, the system rushes through the identification process in real-time, significantly reducing both time and cost while maintaining accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Rapidly identifies the cause of battery discharge, reducing costs and time spent on analysis by accurately determining the first wake-up controller and non-sleep causes, enabling efficient battery management.
Implementation Method 1
The sensor is configured to sense a current of the fuse block connected to the vehicle controller
Data Source
AI summary
A system for controlling a vehicle includes a fuse block connected to a vehicle controller and configured to supply power to the vehicle controller. The system also includes a power control device that includes a sensor and a processor. The sensor is configured to sense a current of the fuse block connected to the vehicle controller. The processor is configured to determine the vehicle controller as being a wake-up vehicle controller when an electrical signal is input from the sensor as change in current of the fuse block is sensed by the sensor.