Universal Vehicle Speed Calculator for Multi-Source Data
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Solution Overview
Problem
Existing vehicle speed calculating devices are limited to specific types of raw data generating devices, making them inflexible and requiring replacement when data sources change, which complicates production, inventory, and distribution management, and can trigger unnecessary warnings during vehicle stops.
Innovation Solution
A universal vehicle speed calculating device that determines and processes various types of raw data, such as GPS signals and rectangular pulse signals, using a signal determining unit and vehicle speed calculating unit, allowing continuous use regardless of data source changes and enabling wireless or wired data delivery to other electronic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vehicle speed calculating device is designed to match only one type of raw data generating device, then the device can be optimized for that specific data source, but the device must be replaced when a raw data generating device is replaced, causing difficulty in production, inventory, and distribution management
Solution Approach 1:
The vehicle speed calculating device is designed with a universal interface that can accept multiple types of raw data generating devices (GPS modules, vehicle speed sensors, OBD terminals) through a single input socket. The device automatically detects and adapts to different data sources without requiring replacement, thus achieving both reliability for specific devices and versatility across multiple device types.
Solution Approach 2:
The device incorporates dynamic detection capabilities that automatically identify the type of raw data generating device connected and adjust its processing accordingly. This dynamic adaptation allows the same hardware to work reliably with different data sources by changing its operational mode based on the detected device type.
2Reliability
If vehicle speed information is continuously monitored, then driver drowsiness can be detected, but unnecessary warnings may be triggered during vehicle stops
Solution Approach 1:
The driver state monitoring system uses feedback from the vehicle speed calculating device to determine whether the vehicle is in motion or stopped. When the vehicle speed is zero or below a threshold, the system automatically suppresses drowsiness warnings, preventing false alarms during stops while maintaining accurate monitoring when the vehicle is traveling.
Solution Approach 2:
The monitoring system dynamically changes its operational parameters based on vehicle speed. When vehicle speed indicates the vehicle is stopped, the system changes the warning threshold or disables warnings temporarily, thus avoiding false positives while maintaining sensitive detection during actual driving conditions.
Data Source
AI summary
Vehicle speed calculating device and method and a driver state monitoring system including the vehicle speed calculating device are provided. The vehicle speed calculating device includes: a signal determining unit configured to receive raw data input from a raw data generating device connected to an input socket via a UART port and a GPIO port, to perform a validation test on two types of raw data received via the UART port and the GPIO port, to determine one type of raw data as valid raw data, and to output the valid raw data and signal type information generated to correspond to the valid raw data; and a vehicle speed calculating unit configured to receive the valid raw data and the signal type information and to generate vehicle speed information corresponding to a vehicle speed which is calculated by processing the valid raw data using a predetermined processing method to match the signal type information.