Vehicle Impact Detection Using Target and Sensor Acceleration
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Solution Overview
Problem
Existing vehicle systems struggle to accurately determine external impacts based solely on acceleration sensor data, as normal vehicle acceleration can mimic external impacts, leading to inaccurate determinations.
Innovation Solution
An information processing device that receives and arbitrates motion requests, outputs control signals to actuators, and performs determination processing using both detected acceleration values and target accelerations to differentiate between internal and external impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only acceleration sensor detection values are used to determine external impacts, then the determination process is simple, but the accuracy of impact detection deteriorates due to false positives from normal vehicle acceleration
Solution Approach 1:
The patent merges multiple information sources (acceleration sensor detection values and target acceleration values from motion requests) into a unified determination process. By combining these data streams and comparing their relationship, the system achieves more accurate impact detection while maintaining reasonable process complexity.
Solution Approach 2:
The patent introduces target acceleration values as an intermediary reference that mediates between the acceleration sensor detection values and the final impact determination. This intermediary allows the system to distinguish between normal acceleration (matching target values) and actual impacts (deviating from target values).
2Measurement precision
If both detection value and target acceleration are used for determination, then the accuracy of impact detection improves, but the device complexity increases
Solution Approach 1:
The patent implements a dynamic determination process that adapts based on operational context. The system selectively applies different determination strategies depending on whether motion requests are present, allowing flexible adjustment of processing complexity while maintaining high detection accuracy across varying operating conditions.
3Measurement precision
If arbitration of multiple motion requests is performed, then the vehicle control accuracy improves, but the processing time increases
Solution Approach 1:
The patent performs preliminary arbitration of motion requests to determine target acceleration values before impact detection is needed. By pre-establishing the expected acceleration trajectory from arbitrated motion requests, the system reduces real-time processing requirements during impact detection, thus minimizing time loss while maintaining control accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves the precision of determining external impacts by considering both detected and requested acceleration values, reducing false positives and enhancing the accuracy of impact detection.
Implementation Method 1
the sensor main unit detects rotational speed of the wheel based on changes in magnetic flux due to rotation of the magnets
Data Source
AI summary
An information processing device includes a processor. The processor receives a requested acceleration as one of motion requests for a vehicle from each of sets of application software. The processor performs arbitration of requested accelerations that are received. The processor outputs an instruction signal for controlling an actuator of the vehicle based on a target acceleration that is a result of the arbitration of the requested accelerations. The processor acquires a detection value from an acceleration sensor installed in the vehicle. The processor performs first determination processing to determine whether an external impact has been applied to the vehicle, based on the target acceleration in addition to the detection value.