Driving Assistance Device Predictive Speed Control
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Solution Overview
Problem
Conventional driving assistance devices may inadvertently perform deceleration control when the driver does not intend to decelerate, leading to unnecessary interventions.
Innovation Solution
A driving assistance device that calculates the predicted vehicle speed at a target position based on current speed, distance, and deceleration type, and adjusts or avoids deceleration control if the predicted speed is higher than a predetermined value, considering the type of deceleration target and detection likelihood, as well as detecting accelerator operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If deceleration control is performed based on current vehicle speed and distance to stop line, then the vehicle can stop at the target position, but unnecessary deceleration control may be performed when the driver does not intend to decelerate
Solution Approach 1:
The system calculates the predicted vehicle speed at the target position in advance, before executing deceleration control. This preliminary calculation allows the system to predict whether deceleration control is actually needed based on whether the predicted speed would be below the stop line, thereby avoiding unnecessary deceleration control actions
Solution Approach 2:
The system incorporates feedback from accelerator operation detection to adjust deceleration control. When accelerator operation is detected, the system determines that the driver intends to maintain or increase speed, and thus suppresses deceleration control. This feedback mechanism allows the system to adapt to the driver's actual intentions and avoid conflicting control actions
2Measurement precision
If deceleration control is performed to ensure stopping at target position, then stopping accuracy is improved, but driver intention may be overridden causing incorrect interventions
Solution Approach 1:
The system performs preliminary calculation of predicted vehicle speed at the target position before executing deceleration control. This allows the system to anticipate whether the vehicle would naturally stop at or before the target position, and only initiate deceleration control when necessary, thereby maintaining stopping accuracy while avoiding incorrect interventions
Solution Approach 2:
The system dynamically adjusts deceleration control based on real-time detection of accelerator operations and calculated predicted vehicle speeds. When the predicted speed indicates the vehicle would stop at or before the target position, or when accelerator operation is detected, the system dynamically suppresses deceleration control, making the control system adaptive to changing conditions
Data Source
AI summary
A driving assistance device is configured to perform deceleration control in such a way that a vehicle stops at a target position determined by a deceleration target ahead of the vehicle. The driving assistance device is configured to calculate a predicted vehicle speed of the vehicle at the target position when the deceleration control is performed, based on the current vehicle speed of the vehicle, the distance to the target position, and the deceleration that varies depending on the type of the deceleration target. When the predicted vehicle speed is higher than a predetermined value, the driving assistance device is configured not to perform the deceleration control or to reduce the deceleration in the deceleration control.