Vehicle Navigation Using Wheel Speed Pulse Signals for 1-Meter Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Global positioning system (GPS) navigation devices often provide inaccurate vehicle positions, deviating by up to twenty meters from the actual location.
Innovation Solution
A navigation method and system that utilizes a wheel speed sensor and steering angle sensor to emit pulse signals and steering signals, which are processed by a portable device and an instrument cluster device to calculate and display the vehicle's current position on a navigation map with a precision of one meter, improving accuracy over conventional GPS methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS navigation device is used to obtain vehicle position, then navigation function is provided, but position accuracy deteriorates with deviation up to twenty meters from actual position
Solution Approach 1:
The patent introduces an intermediary calculation system that uses wheel speed sensor data and steering angle sensor data as intermediate measurements to compute vehicle position. This intermediary approach bridges the gap between raw sensor data and accurate position determination, achieving 1-meter precision by processing intermediate measurements through coordinate transformation and integration algorithms rather than relying directly on GPS signals
Solution Approach 2:
The patent replaces the GPS-based mechanical/electronic positioning system with a sensor-based measurement system using wheel speed sensors and steering angle sensors. By substituting the GPS dependency with direct mechanical measurements from vehicle components, the system achieves superior position accuracy without relying on satellite signal reception
2Measurement precision
If wheel speed sensor and steering angle sensor are used to calculate position, then position accuracy is improved to one meter precision, but device complexity increases due to additional sensors and calculation steps
Solution Approach 1:
The patent makes the wheel speed sensor and steering angle sensor serve multiple functions: they provide data for both navigation position calculation and vehicle dynamics control. This multi-functionality reduces the need for dedicated navigation-only sensors, thereby limiting the increase in device complexity while achieving high position accuracy
Solution Approach 2:
The system uses existing vehicle sensors (wheel speed and steering angle sensors) that are already part of the vehicle's standard equipment for self-service navigation purposes. By leveraging components that serve the vehicle's own control needs, the system avoids adding dedicated navigation hardware, thus minimizing complexity increase
Data Source
AI summary
A navigation method includes steps of: repeatedly emitting, by a wheel speed sensor, a pulse signal to a processor of a vehicle when the vehicle starts to travel from a start point of a route of a map; in response to receipt of a preset number of the pulse signals transmitting, by the processor, the preset number of the pulse signals to a portable device; calculating, by the portable device, a current position of the vehicle on the map based on a distance associated with the preset number of the pulse signals; and transmitting, by the portable device, data of the map having the current position to the processor so as to display the same.