Vehicle Position Estimation Using Non-Volatile Map Memory
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Solution Overview
Problem
Conventional own position estimation devices face delays in providing driving assistance due to time-consuming position calculation and require large-capacity memories, leading to high costs and limited functionality, especially in microcomputers without DRAM I/F.
Innovation Solution
An own position estimation device utilizing a non-volatile memory to store encrypted map information and current position data, enabling quick access and calculation even with inexpensive microcomputers lacking DRAM I/F, allowing integration with driving assistance functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional own position estimation devices use GNSS position calculation and acquire peripheral map information sequentially, then position information can be obtained, but it takes a long time to provide driving assistance after activation
Solution Approach 1:
The patent pre-loads encrypted peripheral map information into non-volatile memory before the vehicle needs driving assistance. This preliminary action eliminates the need to acquire and process map information sequentially during operation, significantly reducing the time from activation to driving assistance availability.
Solution Approach 2:
The patent uses encrypted copies of peripheral map information stored in non-volatile memory instead of requiring real-time acquisition and processing of full map data. This copying approach allows quick access to necessary map information without the time-consuming process of acquiring and developing peripheral map information during operation.
2Quantity of substance
If large-capacity memory is used to handle large capacity map data, then map data can be processed, but the device becomes expensive requiring expensive SoC
Solution Approach 1:
The patent segments map data into encrypted peripheral map information that can be stored in non-volatile memory with smaller capacity requirements. By processing only the necessary encrypted map segments rather than requiring full large-capacity storage, the system reduces memory requirements and associated costs while maintaining functionality.
Solution Approach 2:
The patent uses non-volatile memory that can be inexpensive and has limited capacity, replacing the need for expensive large-capacity DRAM. The non-volatile memory stores encrypted map information that can be processed as needed, providing a cost-effective solution that eliminates the requirement for expensive SoC with large RAM capacity.
3Ease of manufacture
If inexpensive microcomputer without DRAM I/F is used, then device cost is reduced, but it cannot process large capacity map data
Solution Approach 1:
The patent employs non-volatile memory with limited capacity that is inexpensive and compatible with microcomputers without DRAM I/F. This cheap memory stores encrypted peripheral map information that can be processed by the microcomputer, enabling cost-effective devices to handle map data capabilities that would otherwise require expensive hardware.
Solution Approach 2:
The patent uses encrypted copies of map information stored in non-volatile memory that can be read and processed by inexpensive microcomputers. The encrypted copying mechanism allows the microcomputer to access and process map data without requiring large RAM capacity or DRAM I/F, maintaining both low cost and functional capability.
Data Source
AI summary
An own position estimation device includes: a position information acquisition unit in a vehicle; a first memory in which encrypted map information is stored; a microcomputer that reads the map information, performs calculation based on information obtained from the position information acquisition unit, and outputs driving assistance information; and a second memory that retains the map information and current position information transferred by the microcomputer. The position information acquisition unit, the first memory, and the second memory are connected to the microcomputer through a communication line, and the second memory is a non-volatile memory of the vehicle, and stores own position information, encrypted peripheral map information, and decrypted peripheral map information during an operation of the vehicle.