Vehicle Controller Identification via Signal Delay and Wake-Up Trigger
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Solution Overview
Problem
Identifying the controller causing electrical discharge in vehicles is challenging due to limitations in detecting dark current and abnormal wake-ups in vehicle communication networks, making it difficult to determine which controller is responsible for reactivating the network.
Innovation Solution
A system that includes a signal delay unit and a microcontroller unit (MCU) to store identification information of the controller that sends an initial communication message after the vehicle network has entered sleep mode, using a signal delay unit to transmit a wake-up trigger signal after a predetermined time, and a multi-channel transceiver to convert and transmit the signal to the MCU, allowing identification of the controller causing the electrical discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the microcontroller unit switches from sleep mode to wake-up mode to capture the trigger signal, then the capturing capability is improved, but the response time deteriorates because the switching requires time
Solution Approach 1:
The microcontroller unit is configured to switch to the wake-up mode before the trigger signal is actually received. The predetermined first time period is set such that the MCU completes its mode switching and is ready to capture the trigger signal immediately when it arrives, eliminating the capture delay while maintaining power savings during sleep mode.
2Use of energy by moving object
If the vehicle communication network enters sleep mode to save energy, then energy consumption is reduced, but the ability to detect abnormal wake-ups deteriorates
Solution Approach 1:
The signal delay unit acts as an intermediary between the controllers and the microcontroller unit. It receives trigger signals from controllers during sleep mode, delays them by a predetermined second time period, and then transmits them to the MCU. This allows the network to remain in low-power sleep mode while still enabling reliable detection of abnormal wake-ups through the delayed signal mechanism.
3Loss of energy
If all controllers enter sleep mode to reduce dark current, then electrical discharge is reduced, but the ability to identify the controller causing abnormal wake-up deteriorates
Solution Approach 1:
The signal delay unit creates a temporal copy of the trigger signal by delaying its transmission to the MCU. This copied, delayed version of the signal contains the identification information of the controller that caused the abnormal wake-up, allowing the system to identify the problematic controller while all controllers remain in sleep mode to minimize dark current.
Data Source
AI summary
An embodiment system for identifying a controller causing an electrical discharge of a vehicle includes a signal delay unit communicatively connected to controllers within the vehicle and configured to transmit a wake-up trigger signal after a predetermined first time passes when the wake-up trigger signal is input from a first controller among the controllers, and a microcontroller unit configured to enter into a wake-up mode after the first time passes when the microcontroller unit is in a sleep mode and the wake-up trigger signal is received through a single-channel transceiver connected to the first controller and store an identification of the first controller when the wake-up trigger signal is received from the signal delay unit.