Brake Control Logic for Filtering False Vehicle Speed Triggers
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Solution Overview
Problem
Existing vehicle control systems often activate automatic brakes unnecessarily due to false positives from speed sensors, leading to scheduling delays and waste of operator time and resources.
Innovation Solution
A vehicle braking control system that includes a brake control unit with sensor inputs and control outputs, which generates a vehicle control signal to initiate a brake operation only when the vehicle speed exceeds a designated threshold and meets additional criteria, such as a rate of change of speed below a certain threshold, or when operational data indicates a valid vehicle movement condition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the speed sensor triggers automatic brake activation when speed exceeds a threshold, then vehicle safety is improved, but false positives cause unnecessary braking and operational delays
Solution Approach 1:
The system performs preliminary verification by checking multiple criteria (rate of change of speed, sustained speed threshold, operational state) before initiating brake activation. This preliminary action filters out false positives from transient speed events while maintaining safety for genuine movement conditions
Solution Approach 2:
The control unit continuously monitors speed signals and their rate of change, using this feedback to determine whether to activate brakes. The system evaluates whether the speed increase is sustained and meets operational criteria before triggering brake activation, preventing premature or false braking responses
2Reliability
If the speed sensor triggers automatic brake activation when speed exceeds a threshold, then vehicle safety is improved, but operator time and resources are wasted
Solution Approach 1:
The system performs preliminary verification by checking multiple criteria (rate of change of speed, sustained speed threshold, operational state) before initiating brake activation. This preliminary action filters out false positives from transient speed events while maintaining safety for genuine movement conditions
Solution Approach 2:
The control unit autonomously evaluates whether speed events warrant brake activation by checking multiple criteria, eliminating the need for operator intervention in false positive cases and preserving operator resources for genuine safety concerns
3Reliability
If the system uses multiple criteria to filter false positives, then false brake activation is reduced, but system complexity increases
Solution Approach 1:
The control unit performs multiple functions: monitoring speed, calculating rate of change, comparing against thresholds, checking operational states, and controlling brake activation. This multi-functionality is consolidated in a single control unit, managing complexity while achieving accurate brake activation decisions
Data Source
AI summary
A system (e.g., a vehicle control system) includes a brake control unit that is configured to be operably deployed onboard a vehicle. The brake control unit has one or more sensor inputs and one or more control outputs. One of the sensor units is configured to receive a speed signal from a speed sensor of the vehicle; the speed signal is indicative of a vehicle speed detected by the speed sensor. One of the control outputs is configured for connection to a brake system of the vehicle. The brake control unit is configured to generate a vehicle control signal to initiate a vehicle brake operation responsive to the speed indicated by the speed signal going above a designated first speed threshold and the speed signal meeting one or more first designated criteria in addition to the first speed threshold.