Vehicle Power Supply Monitoring for Stable Load Reconnection
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Solution Overview
Problem
Existing methods for monitoring on-board power supplies in motor vehicles often result in unstable states due to frequent connection and disconnection of consumers, which compromises the availability of non-safety-relevant consumers while maintaining high safety requirements.
Innovation Solution
A method that ensures a sufficient voltage supply for safety-relevant consumers by accurately determining a connection measure, allowing for selective and early connection of non-safety-relevant consumers only when the supply situation is sufficient, thereby avoiding undervoltage events and stabilizing the power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If consumers are frequently connected and disconnected to maintain voltage supply, then safety requirements are met, but availability of non-safety-relevant consumers deteriorates
Solution Approach 1:
The system performs preliminary determination of a connection measure before actually connecting consumers. The control device calculates how many consumers can be connected based on predicted voltage development, and only connects consumers when the connection measure indicates sufficient power budget. This prevents frequent disconnections by ensuring connections are made only when power supply can sustain them.
Solution Approach 2:
The system continuously monitors actual voltage development at the power distributor and compares it with predicted voltage development. Based on this feedback, the control device adjusts the connection measure dynamically. This feedback mechanism ensures that consumers are connected only when voltage conditions permit, maintaining safety while improving availability by avoiding unnecessary disconnections.
2Productivity
If consumers are connected early to increase availability, then comfort is improved, but voltage stability deteriorates due to insufficient power budget
Solution Approach 1:
Before connecting any consumer, the control device preliminarily determines a connection measure that predicts voltage development if the consumer were connected. This preliminary calculation checks whether connecting the consumer would maintain voltage within acceptable ranges, ensuring voltage stability is preserved while allowing early connection when conditions permit.
Solution Approach 2:
The system dynamically adjusts the connection measure based on changing power supply conditions and consumer demand patterns. By modifying this control parameter in real-time, the system can connect consumers earlier when power budget allows, while automatically preventing connections that would compromise voltage stability.
3Reliability
If cascaded connection is used to ensure safe connection, then safety is maintained, but connection speed deteriorates
Solution Approach 1:
The control device performs preliminary determination of the connection measure in advance, calculating the safe connection state before actual connection occurs. This pre-calculation eliminates the need for slow cascaded connection sequences, as the system already knows the safe connection state and can connect consumers directly without iterative safety checks during the connection process.
Solution Approach 2:
The system uses its own voltage monitoring and prediction capabilities to self-determine safe connection states without requiring external verification or cascaded safety checks. The control device independently calculates whether connection is safe based on its measurements and models, enabling faster direct connection while maintaining safety.
Data Source
AI summary
A method for monitoring an on-board power supply of a motor vehicle. A power distributor is provided, via which a supply voltage is supplied to a safety-relevant consumer and via which non-safety-relevant consumers are supplied. A disconnection of consumers takes place if at least one measure of the voltage applied at least to the safety-relevant consumer reaches a limit value. After disconnecting consumers, the measure of the voltage applied to the safety-relevant consumer is ascertained. The measure of the voltage applied to the respective safety-relevant consumer is respectively compared to a further limit value for a sufficient voltage. From the disconnected consumers, at least one consumer to be connected is selected, which is connected if the limit value is respectively reached at the safety-relevant consumers. The consumer to be connected is selected as a function of a connection measure such that the connection measure is not exceeded.