Relative Angle Detection Apparatus Short Circuit Fault Diagnosis
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Solution Overview
Problem
Existing electric power steering systems lack effective detection methods for short circuit faults across signal lines, which can lead to unreliable operation and potential safety issues.
Innovation Solution
A relative angle detection apparatus is designed with dual output means and amplifier circuits operating reversely to each other, along with resistors for power supply connections, to detect abnormalities in signal sums, enabling the identification of short circuit faults across signal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two magnetometric sensors are used with multiplexing to improve reliability, then fault detection capability is improved, but the ability to detect short circuit faults across signal lines deteriorates
Solution Approach 1:
The patent segments the monitoring function into two independent paths: one path monitors the sum of output voltages from both magnetometric sensors, while the other path monitors the individual output voltages separately. This segmentation allows the system to detect short circuit faults that would otherwise be masked by the redundant sensor configuration.
Solution Approach 2:
The patent introduces an intermediary monitoring mechanism that compares the sum of output voltages against expected ranges. This intermediary layer acts as a mediator between the redundant sensors and the control system, enabling detection of short circuit conditions without disrupting the multiplexed sensor operation.
2Reliability
If multiplexing with two magnetometric sensors is implemented, then system reliability is improved, but complexity of the detection system increases
Solution Approach 1:
The patent merges the monitoring function with the existing sensor output processing by using the same signal lines and adding minimal monitoring circuitry. The sum monitoring is integrated into the existing amplifier and signal processing path, avoiding the need for completely separate monitoring systems.
Solution Approach 2:
The monitoring circuit serves multiple functions: it monitors the sum of output voltages for fault detection, verifies individual sensor outputs, and provides short circuit detection capability. This multi-functionality reduces the need for separate dedicated monitoring systems.
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
This configuration allows for reliable detection of short circuit faults, enhancing the system's fault tolerance and preventing operational failures.
Implementation Method 1
Each of the first output means and the second output means preferably has a Hall element that outputs a voltage signal corresponding to the relative rotation angle between the two rotation shafts
Data Source
AI summary
A relative angle detection apparatus includes a first magnetometric sensor and a first voltage amplifier that output a signal corresponding to a relative rotation angle between a first rotation shaft and a second rotation shaft; a first amplifier circuit that amplifies the output signal of the first voltage amplifier; a second magnetometric sensor and a second voltage amplifier that output a signal that corresponds to the relative rotation angle; a second amplifier circuit that amplifies the output signal of the second voltage amplifier; a first resistor that is provided between the first amplifier circuit and a power supply terminal, or between the first amplifier circuit and a GND terminal; and a second resistor that is provided between the second amplifier circuit and the power supply terminal, or between the second amplifier circuit and the GND terminal.