Driving Evaluation Apparatus Using Entry Angle and Speed
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Solution Overview
Problem
Existing driving evaluation systems face challenges in accurately assessing the driving status of vehicles in areas requiring stop or deceleration due to high calculation loads, particularly in areas with GPS signal errors or obstructions.
Innovation Solution
A driving evaluation apparatus that uses GPS signals to acquire location and speed information, calculates the entry direction into a determination area, determines if the vehicle is within a stop or deceleration state based on predetermined angles and speeds, and evaluates the driver's status within a defined area, reducing the need for complex angle calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the device calculates the amount of change in angle based on GPS signals to determine stop state, then the moving direction and speed can be determined, but the calculation load becomes high and it becomes difficult to appropriately evaluate driving status
Solution Approach 1:
The patent extracts only the necessary information (entry direction and speed) from the GPS data, rather than calculating all possible parameters including continuous angle changes. By focusing specifically on the entry direction relative to the reference entry direction and the speed within the determination area, the system achieves accurate driving status evaluation while significantly reducing calculation load.
Solution Approach 2:
The patent pre-defines determination areas with reference entry directions and predetermined angles before the vehicle arrives. This allows the system to simply compare the actual entry direction against the pre-calculated reference, rather than performing complex real-time angle change calculations, thereby reducing processing requirements while maintaining evaluation accuracy.
2Reliability
If complex angle calculations are performed to determine entry direction, then driving status can be evaluated, but processing time increases and efficiency decreases
Solution Approach 1:
The system pre-establishes determination areas with reference entry directions and predetermined angle thresholds before vehicle arrival. This preliminary setup enables rapid real-time comparison of actual entry directions against pre-calculated references, significantly improving processing efficiency while maintaining reliable driving status evaluation.
Solution Approach 2:
The patent performs only the necessary angle comparison (entry direction vs. reference entry direction within predetermined angle) rather than comprehensive continuous angle monitoring. This partial action approach maintains sufficient reliability for driving status evaluation while dramatically reducing processing time and computational resources required.
3Measurement precision
If continuous monitoring of angle changes is performed, then stop state can be detected, but the system becomes sensitive to GPS signal errors and obstructions
Solution Approach 1:
The patent pre-defines determination areas with reference entry directions and predetermined angle thresholds before the vehicle arrives. This allows the system to use a single angle comparison at entry point rather than continuous monitoring, reducing sensitivity to GPS signal errors and obstructions while maintaining stop state detection precision.
Solution Approach 2:
The system performs a single angle comparison measurement (entry direction vs. reference) rather than continuous angle change monitoring. This partial measurement approach reduces the accumulation of GPS errors over time while maintaining sufficient precision for detecting whether the vehicle is in a stop state within the determination area.
Data Source
AI summary
Driving-evaluation-apparatus evaluating driving-status of driver driving mobile-body, includes: microprocessor and memory. The microprocessor functions as: information-acquisition-unit acquiring location/travel-speed-information of mobile-body based on GPS-signals received by driver's mobile-terminal; entry-direction-calculation-unit calculating entry-direction in which mobile-body enters determination-area based on location/travel-speed-information; entry-direction-determination-unit determining whether angle formed by entry-direction and predetermined-reference-entry-direction is predetermined-angle or smaller; state-determination-unit determining whether there is stop/deceleration-state in which travel-speed is predetermined-travel-speed or lower within time-period from time-point when mobile-body enters determination-area to time-point when mobile-body exits determination-area based on location/travel-speed-information when angle is predetermined-angle or smaller; and driving-evaluation-unit evaluating driver's driving-status in determination-area based on determination-result. The determination-area is area inside determination-circle centered on reference-point predetermined-distance before the predetermined-location and having predetermined-radius. The angle is angle formed by: straight-line along the reference-entry-direction and passing through the reference-point; and straight-line connecting plot representing location of the mobile-body before entering inside the determination-circle based on location/travel-speed-information and the reference-point.