Vehicle Collision Detection Using Effective Mass Computation
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Solution Overview
Problem
Existing collision detection systems for vehicles are inadequate in accurately detecting collisions with moving two-wheel vehicles, as the relative speed between the vehicle and the two-wheel vehicle can result in an effective mass calculation that does not reach the threshold value for collision determination, leading to unsatisfactory collision detection performance.
Innovation Solution
A collision detection device that includes a vehicle speed detection unit, a collision prediction unit, and an effective mass computation unit, which computes the effective mass based on a speed lower than the vehicle speed when a collision with a two-wheel vehicle is predicted, and uses relative speed or physical quantities detected by additional units to improve collision detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the effective mass is calculated using the relative speed between the vehicle and a moving two-wheel vehicle, then the collision detection may account for the object's motion, but the effective mass calculated does not reach the threshold value for collision determination when the object is running toward the vehicle
Solution Approach 1:
The patent changes the parameter used for effective mass calculation from relative speed to vehicle speed. Specifically, when a two-wheel vehicle is detected, the system calculates effective mass using the vehicle's own speed rather than the relative speed between the vehicle and the two-wheel vehicle. This parameter change ensures that the effective mass reaches the threshold value for collision determination even when the two-wheel vehicle is moving toward the vehicle, thereby improving collision detection reliability
2Reliability
If the effective mass is calculated using the vehicle speed, then the collision detection threshold is reliably met, but the detection accuracy for moving objects such as two-wheel vehicles is insufficient
Solution Approach 1:
The patent applies parameter changes by selectively using different speed parameters based on the detected object type. When a two-wheel vehicle is detected, the system uses vehicle speed for effective mass calculation to ensure reliable threshold meeting. For other objects, the system can use relative speed or other appropriate parameters, thus achieving both reliability and accuracy through context-dependent parameter selection
3Reliability
If a lower speed than vehicle speed is used to compute effective mass for two-wheel vehicles, then collision detection performance is improved, but the configuration becomes more complex with additional computation logic
Solution Approach 1:
The patent simplifies the complexity issue by implementing a straightforward parameter change: when a two-wheel vehicle is detected, the system simply uses the vehicle's own speed as the collision speed for effective mass calculation. This approach avoids complex relative speed calculations and additional computation logic, achieving improved collision detection performance through a simple and elegant parameter selection strategy
Data Source
AI summary
An object is identified by an on-board camera and a relative speed of the vehicle and the object is acquired. If the object is a two-wheel vehicle and the relative speed is lower than the vehicle speed, the relative speed is set as a collision speed. If the object is an object other than a two-wheel vehicle, the vehicle speed is set as the collision speed. Using the set collision speed, an effective mass is computed and collision determination is executed.