Vehicle Backup Power System with Capacitor Health Diagnostics
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Solution Overview
Problem
Backup power systems in vehicles fail to operate effectively due to energy storage capacity loss in capacitors, leading to unexpected disruptions in critical vehicle functions.
Innovation Solution
A backup power system with integrated diagnostic capabilities, including a microcontroller, charging and discharging circuits, and voltage detection, which performs diagnostics during charging and operation to ensure reliable temporary power supply to electronic control units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If backup power systems use capacitors for energy storage, then temporary power supply capability is provided, but energy storage capacity is lost over time leading to system failure
Solution Approach 1:
The diagnostic system performs preliminary detection of capacitor health status before complete failure occurs. By monitoring parameters such as capacitance value and equivalent series resistance during charging phases, the system identifies degradation trends early and can trigger preventive maintenance or system reconfiguration before the backup power system fails when needed.
Solution Approach 2:
The system implements continuous feedback monitoring of capacitor performance parameters during charging and discharging cycles. The microcontroller analyzes voltage-current characteristics and energy storage capacity in real-time, comparing measured values against threshold criteria to detect degradation. This feedback loop enables dynamic assessment of backup power availability and triggers alerts when capacity loss exceeds acceptable limits.
2Difficulty of detecting and measuring
If diagnostic capabilities are integrated into the backup power system, then failure detection is enabled, but device complexity increases
Solution Approach 1:
The diagnostic functions are integrated into the existing control microcontroller of the backup power system, which already manages charging and discharging operations. The same microcontroller executes both power management tasks and diagnostic measurements, using existing voltage and current sensing circuits for dual purposes. This multi-functionality approach enables failure detection without adding separate dedicated diagnostic hardware, thereby minimizing complexity increase.
Solution Approach 2:
The diagnostic measurement circuits are merged with the power management circuits. The voltage sensing circuits used for monitoring battery voltage during charging are simultaneously used for detecting capacitor voltage in diagnostic tests. Current sensing circuits serve both power control and impedance measurement functions. This merging of functions reduces the number of separate components and simplifies the overall system architecture while maintaining comprehensive diagnostic capability.
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
Enables continuous operation of electronic control units by detecting energy storage capacity issues and providing timely backup power, ensuring critical messages can be sent between vehicle systems even during main power failures.
Implementation Method 1
an energy reservoir (230) configured to receive a charge from a charging circuit (222) of the backup power system (110) when the microcontroller (235) is in the first state and configured to supply a discharge current to a discharging circuit (224) when the microcontroller (235) is in the second state
Data Source
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AI summary
A backup power system in a vehicle that provides temporary power to one or more electronic control units (ECUs) upon failure of a main power supply. The backup power system includes an energy reservoir that stores electric charge. A charging circuit is electrically connected to the energy reservoir to generate charge for the energy reservoir during normal operation of the vehicle. A discharging circuit for supplying backup power is electrically connected between the energy reservoir and the ECUs. A diagnostic circuit is electrically connected to the energy reservoir and a microcontroller. The microcontroller is configured to monitor a slew rate of the energy reservoir as an amount of stored electric charge in the energy reservoir changes, determine if the slew rate is within a predetermined range, and when the slew rate is not within the predetermined range, generate a first error signal.