Navigation Unit Sensor Layout for Vibration-Accurate Positioning
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Solution Overview
Problem
Conventional car navigation devices suffer from inaccuracies in detecting the position of the vehicle due to deviations between the inertial sensor's behavior and the vehicle's behavior caused by improper installation positioning, which leads to deformation and vibration.
Innovation Solution
A navigation device design that positions the inertial sensor between fixing portions on side plates, using a bracket to minimize vibration impact and align the sensor's center of gravity with the vehicle's fixed axis, thereby reducing deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the inertial sensor is installed at a position far from the fixed position of the vehicle side member, then the installation flexibility is improved, but the measurement precision deteriorates due to deformation and vibration
Solution Approach 1:
A bracket is introduced as an intermediary component between the navigation device and the vehicle side member. The bracket is specifically designed to be fixed to the fixed position on the vehicle side member, while the inertial sensor is mounted on the bracket at an optimized position. This intermediary structure allows the sensor to be positioned away from the direct mounting location on the vehicle, providing installation flexibility while maintaining measurement precision through the bracket's vibration isolation and positioning capabilities.
2Adaptability or versatility
If the inertial sensor is positioned away from the center of the navigation device, then the installation adaptability is improved, but the reliability deteriorates due to increased vibration and deformation effects
Solution Approach 1:
The bracket serves as a mediator that decouples the sensor positioning from the navigation device mounting location. The bracket is fixed to the vehicle side member at the fixed position, while the inertial sensor is mounted on the bracket at an optimized position that may be away from the center of the navigation device. This allows the system to adapt to different installation configurations while maintaining sensor reliability through the bracket's stable mounting and optimized sensor placement.
Solution Approach 2:
The bracket is designed with specific local characteristics to optimize sensor mounting. The bracket includes a sensor board with a predetermined shape that provides a stable, vibration-resistant mounting surface for the inertial sensor. This local optimization of the bracket structure at the sensor mounting location ensures reliable sensor operation even when the sensor is positioned away from the navigation device center.
Data Source
AI summary
A navigation device includes an outer panel and an inertial sensor. The outer panel includes a pair of side plates separated from each other in a first direction and facing each other. A pair of fixing portions are provided on the pair of side plates. The pair of fixing portions are fixed to moving body-side fixing members. The inertial sensor is provided inside surrounded by the outer panel and arranged at a position sandwiched between the pair of fixing portions in the first direction.