Boosting Device Sensor Failure Detection Control
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Solution Overview
Problem
The control performance of a boosting converter in electric vehicles and hybrid vehicles deteriorates due to stuck abnormalities in current sensors measuring reactor current, leading to fluctuations in boosted voltage and reactor current.
Innovation Solution
A boosting device with a control unit that determines failure in the current sensor by monitoring variations in reactor current and pre-boosting voltage, using a capacitor to smooth battery voltage and sensors to detect pre-boosting and boosted voltages, allowing for feedback control to converge the boosted voltage even when a stuck abnormality occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback control is performed using reactor current measurement, then control precision of boosted voltage is improved, but system reliability deteriorates when current sensor fails
Solution Approach 1:
The control unit performs preliminary failure determination by monitoring the relationship between reactor current variation and pre-boosting voltage variation before they cause control instability. When the current sensor is determined to have a stuck abnormality, the control unit switches to alternative control using only boosted voltage feedback, preventing the deterioration of control performance.
Solution Approach 2:
The system uses dual feedback mechanisms: primary feedback from current sensor for precise reactor current control, and secondary feedback from boosted voltage sensor for voltage stabilization. The control unit continuously monitors both feedback signals and switches between them based on sensor health status, ensuring continuous stable operation even when one sensor fails.
2Measurement precision
If current sensor stuck abnormality occurs, then measurement precision is maintained at stuck value, but control stability deteriorates due to false control signals
Solution Approach 1:
The control unit applies preliminary anti-action by detecting the stuck abnormality condition through the correlation analysis between current variation and voltage variation, and counteracting the harmful effect by switching to voltage-based feedback control before the stuck signal can cause control instability or oscillation.
Solution Approach 2:
The control unit acts as an intermediary that mediates between the potentially faulty current sensor signal and the control actuator. It monitors the current sensor output and, upon detecting stuck abnormality, replaces the faulty signal with control decisions based on boosted voltage feedback, preventing the stuck signal from destabilizing the control system.
3Productivity
If feedback control uses both boosted voltage and reactor current, then control performance is improved, but system complexity increases
Solution Approach 1:
The control system dynamically adjusts its configuration based on sensor health status. Under normal conditions, it operates as a dual-feedback system using both current and voltage sensors for optimal performance. When sensor failure is detected, it dynamically reconfigures to a single-feedback mode using only voltage sensor, maintaining adequate control performance while reducing complexity.
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
Prevents fluctuations during control operations by accurately determining sensor failures and maintaining stable reactor current and voltage, ensuring proper feedback control and efficient motor generator operation.
Implementation Method 1
a capacitor connected in parallel with the battery to store a pre-boosting voltage
Data Source
AI summary
Proper control is performed even during a stuck abnormality of a current sensor 56 configured to detect a reactor current. A boosting converter 12 is controlled by feedback control of a boosted voltage of the boosting converter 12 and a reactor current, detected by the current sensor 56, of a reactor 54 in the boosting converter 12. When a variation of the reactor current is less than a predetermined current value, failure determination of the current sensor is performed and, if a variation of the pre-boosting voltage exceeds a predetermined voltage value, failure of the current sensor is determined.