Low Voltage DC-DC Converter Sensing Error Detection
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Solution Overview
Problem
In autonomous vehicles, sensing errors in low voltage DC-DC converters can lead to battery discharge and safety issues, necessitating a method to determine and prevent such errors.
Innovation Solution
An apparatus and method that utilize a controller to assess currents input to loads and batteries, comparing values under different operational conditions to detect sensing errors in low voltage DC-DC converters, thereby preventing battery discharge and identifying external defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If LDC sensing is used to control current output, then power distribution control is improved, but sensing errors can occur causing battery discharge
Solution Approach 1:
The patent implements a feedback mechanism where the controller continuously monitors multiple current parameters (first current from LDC, second current to battery, third current from battery, fourth current to second load) and compares actual values with expected values to detect sensing errors in the LDC current sensor
Solution Approach 2:
The patent introduces an intermediary detection system that uses the relationship between multiple currents (first, second, third, and fourth currents) as intermediate parameters to indirectly detect LDC sensing errors without requiring direct sensing of the LDC output current alone
2Reliability
If dual power source redundancy is implemented, then system reliability is improved, but complexity of power management increases
Solution Approach 1:
The controller performs multiple functions: it manages normal power distribution between loads and battery, monitors current parameters, detects sensing errors, and triggers safety responses. This multi-functionality consolidates what could be separate systems into a single control unit, managing complexity while maintaining redundancy
3Productivity
If LDC sensing error is not detected, then system operation continues, but battery discharge and safety issues occur
Solution Approach 1:
The patent performs preliminary detection of sensing errors by continuously monitoring current parameters and comparing them against expected relationships. The error detection occurs before battery discharge can occur, allowing preventive action to be taken
Solution Approach 2:
The system prepares countermeasures in advance by detecting sensing errors early and triggering safety responses (such as disabling LDC output or alerting the driver) before the harmful effect of battery discharge occurs
Data Source
AI summary
An apparatus for determining a sensing error of a LDC, which controls and senses an output and an output cutoff of a first current inputted to a first load of a vehicle and an output and an output cutoff of a second current for charging a battery, includes a battery control device that senses the second current and a third current for discharging the battery; a power control device that receives the first current, the second current, and the third current and calculates a fourth current inputted to a second load for controlling the vehicle driving by controlling an operation of switching element; and a controller that determines whether the sensing error of the LDC occurs based on the first current, the second current, the third current, and the fourth current.