Vehicle Distance Control Using Reliable Target Extrapolation
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Solution Overview
Problem
Conventional driving support systems risk annoying the driver by performing deceleration support control on objects that are not the target object due to changes in detection reliability, leading to erroneous recognition.
Innovation Solution
The system uses a first recognition method with increasing reliability over time and, when the first distance cannot be acquired for a predetermined threshold, employs an extrapolation distance based on previous acquired data to ensure the control distance is accurate, thereby reducing the likelihood of controlling non-target objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If the detection reliability is changed from a high state to a low state, then the system becomes more sensitive to detect objects, but the possibility of performing deceleration support control on non-target objects increases
Solution Approach 1:
The system performs preliminary verification by checking whether the acquisition time of the first distance is equal to or longer than a predetermined threshold time before executing deceleration support control. This preliminary action prevents erroneous control on non-target objects while maintaining detection sensitivity.
Solution Approach 2:
The acquisition time of the first distance serves as an intermediary parameter that mediates between detection sensitivity and control accuracy. By using this intermediate verification criterion, the system avoids direct reliance on detection reliability alone, thereby preventing false positive controls.
2Measurement precision
If the first recognition method is used to increase recognition reliability over time, then the accuracy of target object identification improves, but the response time for control execution increases
Solution Approach 1:
The system performs preliminary acquisition of the first distance with increasing recognition reliability over time, but executes control based on extrapolation distance when the acquisition time meets the threshold criterion. This preliminary verification approach ensures accuracy without excessive time loss.
Solution Approach 2:
The system creates a copy of the distance measurement through extrapolation based on previously acquired first distance data and vehicle speed. This copied distance value allows rapid control execution while maintaining reliability, avoiding the need to wait for extended acquisition time.
3Duration of action of stationary object
If the extrapolation distance is used when the first distance cannot be acquired, then the control continuity is maintained, but the reliability of control distance decreases when acquisition time is short
Solution Approach 1:
The system performs preliminary verification of the acquisition time before using extrapolation distance for control. By checking whether the acquisition time meets the threshold, the system ensures that extrapolation is only used when reliability is sufficient, maintaining both continuity and reliability.
Solution Approach 2:
The system changes the parameter used for control distance based on the acquisition time condition. When acquisition time is sufficient, it uses the first distance; when insufficient, it switches to extrapolation distance. This parameter switching maintains control continuity while managing reliability through conditional selection.
Data Source
AI summary
A driving support apparatus comprises a sensor configured to acquire sensor information that is used to acquire a distance between a vehicle and an object, and a controller configured to execute a driving support control using a first distance, which is acquired by applying a first recognition method to the sensor information, representing a distance between the vehicle and a target object as a control distance. The first recognition method has a characteristic that a recognition reliability of the target object increases as an acquisition time of the first distance increases. The controller is configured to use an extrapolation distance representing the vehicle and the target object as the control distance, when the first distance can no longer be acquired and the acquisition time is equal to or longer than a predetermined threshold time.