Brake Hold Cancellation Logic for Safe Driver Maneuver Detection
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Solution Overview
Problem
Conventional drive assistance devices cancel brake hold control prematurely, leading to unsafe vehicle movements, such as unintended acceleration or collision, due to incorrect detection of driver maneuvers and lack of consideration for the vehicle's surroundings.
Innovation Solution
A drive assistance device that includes an automatic brake unit, brake hold unit, brake hold cancel unit, surroundings information obtaining unit, maneuver information obtaining unit, maneuver determination unit, and prohibition unit, which assesses the appropriateness of driver maneuvers relative to the vehicle's surroundings before canceling brake hold control, ensuring safe conditions for cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If brake hold control is cancelled when a driver maneuver is detected, then the vehicle can respond quickly to driver input, but the vehicle may move unintentionally when the driver mistakenly presses a wrong pedal
Solution Approach 1:
The system continuously monitors driver maneuvers and surroundings information, using feedback loops to determine whether to cancel brake hold control. The maneuver determination unit evaluates the appropriateness of detected maneuvers by comparing them with surroundings information, creating a closed-loop control system that adapts to real-time conditions
Solution Approach 2:
The maneuver determination unit acts as an intermediary between the brake hold cancel unit and the brake hold unit. It intermediates the cancellation process by evaluating both the detected maneuver and the surroundings information, preventing direct cancellation when the maneuver is inappropriate
2Reliability
If brake hold control is maintained for a predetermined time after automatic braking, then the vehicle remains stopped safely, but the driver's intended maneuver is delayed
Solution Approach 1:
The brake hold control duration is made dynamic rather than fixed. The system adjusts the control period based on real-time evaluation of driver maneuvers and surroundings conditions, extending or shortening the hold period as needed to balance safety and responsiveness
Solution Approach 2:
The system performs preliminary evaluation of driver maneuvers and surroundings information before canceling brake hold control. By assessing conditions in advance and only canceling when appropriate, the system prepares for timely cancellation without compromising safety
3Reliability
If the system evaluates driver maneuver appropriateness based on surroundings information, then vehicle safety is improved, but the system complexity increases
Solution Approach 1:
The maneuver determination unit serves multiple functions: detecting driver maneuvers, evaluating their appropriateness based on surroundings information, and controlling the cancellation of brake hold control. This multi-functionality reduces the need for separate dedicated components for each function
Data Source
AI summary
A drive assistance device includes an automatic brake unit configured to perform automatic brake control, a brake hold unit configured to perform a brake hold control keeping the vehicle stopped, a brake hold cancel unit configured to cancel the brake hold control when it is determined that a predetermined cancel condition is satisfied, a surroundings information obtaining unit configured to obtain surroundings information indicating a situation around the vehicle, a maneuver information obtaining unit configured to obtain maneuver information about a driving maneuver performed by a driver of the vehicle, a maneuver determination unit configured to determine, based on the surroundings information and the maneuver information whether the driving maneuver performed during the brake hold control is appropriate for the situation around the vehicle, and a prohibition unit configured to prohibit cancelling the brake hold control as long as it is determined that the driving maneuver is inappropriate.