Vehicle Braking Control Device Using Dynamic Urgency Thresholds
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing braking force assist control systems for collision avoidance in vehicles often fail to accurately determine when to initiate a braking force increase, leading to either unnecessary or insufficient braking force applications, which can cause discomfort for the driver and compromise safety.
Innovation Solution
A braking control device that uses estimated time to an obstacle, combined with braking operation amount and speed, to determine the urgency of the braking operation, allowing for more precise timing of braking force assist control initiation, thereby reducing driver discomfort and enhancing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If braking force assist control is executed based on uniform urgent braking operation judgment reference, then the braking force increase can be triggered, but it may cause driver discomfort when the necessity for braking force increase varies with collision-anticipated time
Solution Approach 1:
The patent applies dynamics by making the urgent braking operation judgment reference values variable based on collision-anticipated time. As the collision-anticipated time decreases, the threshold values for braking operation amount and speed are dynamically adjusted to become more lenient, allowing the system to adapt to the varying necessity for braking force increase at different time stages before potential collision.
Solution Approach 2:
The patent changes the parameters of the judgment reference values (braking operation amount threshold and braking operation speed threshold) based on the collision-anticipated time parameter. This allows the system to optimize the balance between reliable detection of urgent braking operations and maintaining driver comfort by adjusting sensitivity according to the time remaining before potential collision.
2Reliability
If braking operation amount and speed are used to judge urgent braking operation, then the braking force assist control can be initiated, but it may fail to detect urgent braking when braking operation speed decreases quickly
Solution Approach 1:
The patent applies preliminary action by using the braking operation amount as a primary indicator that can detect urgent braking operations even when the braking operation speed has already decreased. This allows the system to maintain reliable detection capability throughout the entire braking process, not just at the initiation phase, ensuring timely response even when speed metrics fail to indicate urgency.
3Reliability
If braking force assist control increases braking force simultaneously with moderate braking operation for collision avoidance, then the braking force is sufficient for safety, but the driver feels uncomfortable due to excessive braking force increase
Solution Approach 1:
The patent applies parameter changes by adjusting the judgment reference values based on collision-anticipated time, which allows the system to differentiate between situations requiring strong braking force assist and those where moderate braking is sufficient. This dynamic parameter adjustment prevents unnecessary or excessive braking force increases that would cause driver discomfort while maintaining adequate braking force for safety.
Data Source
AI summary
The inventive vehicle braking control device performs a brake assist control of increasing a braking force for avoiding a collision of a vehicle at a more appropriate time. The device comprises a portion which acquires an estimated time until a vehicle reaches to an obstacle; a portion which judges based on a braking operation amount and a braking operation speed value if the driver performed an urgent braking operation; and a portion which determines the start of a braking force assist control when an urgent braking operation is judged in a case that the estimated time is less than a first predetermined time, wherein, if the estimated time is less than a second predetermined time shorter than the first predetermined time, the urgent braking operation is judged when the braking operation amount exceeds a threshold value irrespective of the braking operation speed value.