Vehicle ECU Resonance Frequency Control via Sensor Mounting
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Solution Overview
Problem
Electronic control devices in vehicles face erroneous control due to resonance frequency overlap with sensor frequency bands, leading to incorrect determination of vehicle rotation or collision, which can result in inappropriate activation of airbags or vehicle stability control systems.
Innovation Solution
The electronic control device is designed with an acceleration sensor and angular velocity sensor mounted on an electronic substrate, which is fixed to a housing at multiple points, including a target area with a high resonance frequency, preventing signal frequency overlap and reducing erroneous signals. This configuration includes a capacitor and connector placement to minimize noise interference and enhance fixing strength, ensuring accurate control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electronic substrate is fixed to the housing at multiple points to increase resonance frequency, then the reliability of sensor detection is improved, but the device complexity increases
Solution Approach 1:
The electronic substrate is divided into multiple fixing regions, each fixed at separate points to the housing. This segmentation allows the resonance frequency to be increased by distributing fixing points while maintaining manageable structural complexity through modular assembly
Solution Approach 2:
Different regions of the electronic substrate are fixed with different fixing strengths and methods tailored to local requirements. The target area with sensors receives enhanced fixing to raise resonance frequency, while other areas use standard fixing, thus improving reliability without uniformly increasing device complexity
2Measurement precision
If the resonance frequency is increased to prevent overlap with sensor frequency bands, then the measurement precision of sensors is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The housing and electronic substrate are designed with pre-defined fixing point locations and structures before assembly. This preliminary design establishes the resonance frequency characteristics in advance, allowing standard manufacturing tolerances to achieve the required precision without demanding extreme positioning accuracy during assembly
Solution Approach 2:
The resonance frequency is adjusted by changing physical parameters such as fixing point locations, fixing strength, and structural stiffness rather than requiring precise positioning of all components. This allows achieving the desired frequency separation through parameter optimization within standard manufacturing capabilities
3Reliability
If the target area is minimized to reduce vibration amplitude, then the reliability of control determination is improved, but the area available for component mounting decreases
Solution Approach 1:
The sensors and critical electronic components are extracted and positioned in a dedicated target area that is minimized to reduce vibration amplitude. By concentrating essential components in this small, tightly-fixed region, the patent achieves reliable control determination while the remaining larger area of the electronic substrate is available for mounting other non-critical components
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 solution effectively prevents erroneous control by increasing the resonance frequency in the target area, reducing vibration amplitude, and ensuring that sensor signals do not overlap with their respective frequency bands, thus enhancing the accuracy of vehicle control systems.
Implementation Method 1
the resonance frequency which is generated when vibration is applied from the outside to the airbag electronic control device 1 having the housing and the electronic substrate 6 overlaps the low frequency band to be used
Implementation Method 2
reducing vibration amplitude, and ensuring that sensor signals do not overlap with their respective frequency bands
Data Source
AI summary
An electronic control device is mounted in a vehicle and controls a control target provided in the vehicle. An acceleration sensor detects an acceleration of the vehicle. An angular velocity sensor detects an angular velocity of the vehicle. The acceleration sensor and the angular velocity sensor are mounted on an electronic substrate. A housing accommodates the electronic substrate and is fixed to a body of the vehicle. The electronic substrate is fixed to the housing at least four fixing points, and the acceleration sensor and the angular velocity sensor are arranged in the smallest target area from among a plurality of areas having multiple points selected from the at least four fixing points as vertexes.