Driving Evaluation Apparatus with GPS Signal Intermittence Handling
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Solution Overview
Problem
GPS signal intermittence makes it difficult to continuously evaluate driving status, particularly when determining speed excess duration, leading to inaccurate assessments.
Innovation Solution
A driving evaluation apparatus that includes an information acquisition unit for GPS-based location and speed data, a speed excess determination unit to assess speed violations, and a timer to count predetermined time periods, allowing for continuous evaluation even when GPS signals are not received continuously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS signal reception is used to continuously monitor driving status, then measurement precision of driving behavior is improved, but reliability of continuous evaluation deteriorates due to signal intermittence
Solution Approach 1:
The system performs preliminary action by stopping the speed excess determination for a predetermined time period once speed excess is detected. This prevents the need for continuous GPS signal reception during the evaluation period, as the determination is made based on the initial detection and then suspended for the predetermined duration. This resolves the contradiction by enabling reliable continuous evaluation even when GPS signals are intermittent.
2Measurement precision
If speed excess determination is continuously performed based on GPS signals, then driving status evaluation accuracy is improved, but loss of time occurs when GPS signals are not received continuously
Solution Approach 1:
The system implements periodic action by performing speed excess determination at regular intervals rather than continuously. The determination is conducted, then stopped for a predetermined time period, and resumed after that period elapses. This periodic approach reduces the time loss associated with continuous GPS signal requirements while maintaining adequate evaluation accuracy through periodic assessments.
3Reliability
If predetermined time period for speed excess determination is extended, then reliability of speed violation confirmation is improved, but productivity of evaluation process deteriorates due to longer evaluation cycles
Solution Approach 1:
The system applies parameter changes by adjusting the predetermined time period parameter to optimize the balance between reliability and productivity. By setting an appropriate predetermined time period, the system ensures sufficient reliability for speed violation confirmation while minimizing the impact on evaluation processing efficiency. This parameter optimization resolves the contradiction between reliable confirmation and processing efficiency.
Data Source
AI summary
A driving evaluation apparatus configured to evaluate driving status of driver driving mobile body in preset determination area, includes: a microprocessor and a memory. The microprocessor is configured to function as: an information acquisition unit configured to acquire location information and travel speed information of the mobile body based on GPS signals; a speed excess determination unit configured to determine whether travel speed of the mobile body in the determination area exceeds predetermined travel speed based on the location information and the travel speed information; and a driving evaluation unit configured to evaluate the driving status of the driver in the determination area based on determination result of the speed excess determination. The speed excess determination unit is configured to stop the speed excess determination for predetermined time period when it is determined that the travel speed of the mobile body exceeds the predetermined travel speed.