Magnetic Sensor Steering Angle Detection Ignition Off Power
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Solution Overview
Problem
Existing magnetic sensors for detecting steering angles in automobiles face challenges in achieving high accuracy and reliability, particularly when the ignition switch is turned off, as they struggle to maintain precise detection and power efficiency.
Innovation Solution
A magnetic sensor system incorporating a magneto-resistive element and a Hall element, with a detection circuit that includes a regulator, current paths, and a diagnostic circuit, which allows for selective connection of the magneto-resistive element to the regulator through switchable current paths, enabling efficient signal processing and power management, even when the ignition switch is off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic sensor uses a magneto-resistive element to detect steering angles with high precision, then measurement precision is improved, but power consumption increases and reliability decreases when the ignition switch is turned off
Solution Approach 1:
The patent implements dynamic operation modes for the magnetic sensor: a first operation mode with full functionality when the ignition switch is on, and a second operation mode with reduced functionality when the ignition switch is off. The control unit dynamically switches between these modes based on the ignition state, allowing the sensor to maintain acceptable detection precision while consuming less power and improving reliability during parked conditions.
Solution Approach 2:
The patent changes operational parameters based on ignition state: in the first mode, the sensor operates with full precision requirements, while in the second mode, it transitions to a lower precision mode that consumes less power. This parameter change allows the system to balance between measurement precision and power consumption/reliability depending on the operational context.
2Measurement precision
If the magnetic sensor operates with high precision detection capabilities, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The control unit dynamically adjusts the operation mode based on ignition state. When the ignition is off, the sensor transitions to a second operation mode that reduces power consumption while maintaining sufficient detection capability for safety purposes. This dynamic adjustment directly addresses the contradiction between precision and energy consumption.
Solution Approach 2:
In the second operation mode (ignition off), the sensor performs partial detection functions rather than full precision detection. This partial action is sufficient for safety monitoring purposes while significantly reducing power consumption compared to continuous high-precision operation.
3Measurement precision
If the magnetic sensor maintains full detection functionality when the ignition is turned off, then measurement precision is preserved, but device complexity and power consumption increase
Solution Approach 1:
The patent introduces a control unit that dynamically manages the sensor's operation based on ignition state. This dynamic control simplifies the overall system design by automatically switching between operation modes, eliminating the need for complex manual configuration or multiple separate sensor 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
The system achieves precise detection of steering angles over a full 360-degree range with reduced power consumption and circuit complexity, maintaining accuracy and reliability even when the ignition is turned off, thereby enhancing the overall performance of the magnetic sensor.
Implementation Method 1
A magnetic sensor includes a magneto-resistive element configured to output a signal
Implementation Method 2
A magnetic sensor combining a magneto-resistive element and a Hall element is known
Data Source
AI summary
A magnetic sensor includes a magneto-resistive element configured to output a signal and a detection circuit configured to receive the signal. The detection circuit includes a regulator configured to supply a potential to the magneto-resistive element, a first current path configured to electrically connect the magneto-resistive element to the regulator, a second current path, a switch, and a diagnostic circuit connected to the second current path. The second current path includes, and is configured to electrically connect the magneto-resistive element to the regulator via the resistor. The switch is configured to select one of the first current path and the second current path, and electrically connect the magneto-resistive element to the regulator via the selected one of the first current path and the second current path.