Vehicle Braking Assist Threshold Adjustment
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Solution Overview
Problem
Existing vehicle braking assist systems often apply braking force too early, causing discomfort to drivers when they intentionally approach obstacles, as they fail to accurately discern the driver's intention regarding acceleration or deceleration.
Innovation Solution
The system applies a braking force when the risk potential exceeds a preset threshold, regardless of the accelerator state, ensuring appropriate assistance based on the driver's intention by setting different thresholds for risk potential and considering external disturbances to adjust the timing and magnitude of braking forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If braking assist is applied early to ensure high-speed obstacle avoidance, then obstacle avoidance capability is improved, but driver comfort deteriorates due to premature braking against driver intention
Solution Approach 1:
The system changes the parameter of risk potential threshold based on accelerator operation state. When the accelerator is not operated, a lower first threshold is used for early braking assistance. When the accelerator is operated, a higher second threshold is used to avoid premature braking, thus adapting the braking assist timing to driver intention while maintaining obstacle avoidance capability
Solution Approach 2:
The system uses accelerator operation state as feedback to determine whether to apply braking assist. By detecting whether the driver is operating the accelerator, the system adjusts its braking assistance behavior accordingly, preventing premature braking when the driver intends to accelerate while maintaining safety when the driver is not accelerating
2Reliability
If braking force is applied based on risk potential threshold alone, then obstacle avoidance is improved, but accuracy in discerning driver intention deteriorates
Solution Approach 1:
The system introduces accelerator operation state as an additional parameter to refine risk potential assessment. By combining risk potential threshold with accelerator operation status, the system achieves more precise driver intention detection, distinguishing between cases where braking is appropriate and cases where the driver intends to accelerate through the obstacle
Data Source
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AI summary
When it is judged that the risk potential of a host vehicle with respect to an obstacle ahead of the host vehicle is higher than a first threshold, and accelerator is not operated, a braking force is applied on the host vehicle. In addition, when the risk potential of the host vehicle with respect to the obstacle is higher than a second threshold, with risk potential of the second threshold being higher than the risk potential of the first threshold, a braking force is applied on host vehicle MM irrespective of the operation state of the accelerator.