Dynamic Threshold Adjustment for Vehicle Braking Control
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Solution Overview
Problem
The accuracy of absolute velocity calculation for objects can temporarily decrease due to erroneous detection, such as locked wheels or delayed filter processing, leading to unreliable driving support control in automatic brake systems.
Innovation Solution
A driving support control apparatus with an own vehicle velocity acquiring unit, relative velocity acquiring unit, state determining unit, brake detecting unit, and threshold changing unit, which adjusts the determination threshold for absolute velocity after the automatic brake is actuated, preventing erroneous determination of the relative movement state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic brake is actuated based on calculated absolute velocity, then collision avoidance control is achieved, but calculation accuracy of absolute velocity decreases when wheels are locked or radar filter processing is delayed
Solution Approach 1:
The determination threshold for absolute velocity is made dynamic by changing it based on the actuation state of the automatic brake. When the automatic brake is actuated, the threshold is increased to prevent erroneous determination of relative movement state caused by temporary detection errors, thus resolving the contradiction between maintaining reliable control and handling reduced measurement precision.
Solution Approach 2:
The patent changes the parameter of determination threshold for absolute velocity based on the brake actuation state. By increasing the threshold when automatic brake is active, the system accommodates temporary reductions in measurement precision while maintaining reliable collision avoidance control.
2Measurement precision
If absolute velocity threshold is kept constant for accurate determination, then precise relative movement state detection is achieved, but erroneous operation occurs when detection accuracy temporarily decreases during brake actuation
Solution Approach 1:
The determination threshold is made dynamic rather than constant, adjusting based on the automatic brake actuation state. This allows the system to maintain accurate determination under normal conditions while preventing erroneous operations during brake actuation when detection accuracy temporarily decreases.
Solution Approach 2:
The system preemptively increases the determination threshold before erroneous detection can cause wrong control actions. By anticipating the reduction in detection accuracy during brake actuation and adjusting the threshold in advance, the system prevents erroneous operation rather than reacting after the error occurs.
Data Source
AI summary
A controller calculates absolute velocity of an object based on acquired own vehicle velocity and acquired relative velocity of the object with respect to an own vehicle. The controller determines a relative movement state of the object in a direction of movement of the own vehicle based on the calculated absolute velocity of the object. The controller changes a threshold for the absolute velocity of the object to be used for determination of the relative movement state of the object while the automatic brake is actuated.