Grade Crossing Gate Mechanism With Voltage Reduction and HMI Control
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Solution Overview
Problem
Current highway grade crossing gate mechanisms face issues with voltage fluctuations, as they typically operate within a range of 11 to 16 VDC, leading to reduced brush life, increased stress on mechanical components, and lack of solutions for overvoltage situations, necessitating a mechanism to step down DC voltage for consistent operation across different voltage applications without manually adjustable cams.
Innovation Solution
A voltage reduction circuit that steps down incoming DC voltage from 12 VDC to 30 VDC to 12 VDC, coupled with a human machine interface and control printed circuit board, allows for programmable set points for gate operation, eliminating the need for cams and contacts by using a brushless DC motor with Hall effect sensors and PWM control for smooth and consistent gate movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If DC voltage is increased above 16 VDC to make the motor run faster, then motor speed increases, but brush life decreases and electronic components are damaged
Solution Approach 1:
The patent applies parameter changes by implementing a voltage regulation system that dynamically adjusts the voltage parameter to maintain it within the safe operating range of 11-16 VDC. The system includes voltage detection circuitry and control logic that modifies the power delivery parameters to prevent overvoltage conditions, thereby protecting brush life and electronic components while still allowing the motor to operate at optimal speeds within the permitted voltage range.
2Speed
If cam and contact configuration is used for quick start/stop operation, then operational response speed improves, but mechanical stress on components increases
Solution Approach 1:
The patent replaces the mechanical cam and contact system with an electronic control system using solid-state switches (MOSFETs or IGBTs) controlled by a microcontroller. This substitution eliminates the mechanical wear and stress associated with cam contacts while achieving faster and more precise start/stop operations through electronic switching. The system can implement soft-start and soft-stop functions to reduce mechanical stress spikes while maintaining rapid operational response.
3Measurement precision
If manually adjustable cams are used to control gate operation at preset angular rotation, then control precision is achieved, but device complexity increases
Solution Approach 1:
The patent replaces manually adjustable mechanical cams with an electronic control system that uses sensors (such as Hall effect sensors or encoders) to detect gate arm angular position and a microcontroller to execute control logic. This substitution eliminates the need for manual mechanical adjustments while maintaining precise control of gate arm positioning at required angular rotations. The system achieves this through programmable control algorithms that can be easily modified without physical reconfiguration.
4Adaptability or versatility
If a single gate mechanism is designed to operate in both 12 VDC and 24 VDC systems, then adaptability improves, but voltage fluctuation issues worsen
Solution Approach 1:
The patent implements a voltage adaptation system that automatically detects the input voltage level (12 VDC or 24 VDC) and adjusts its operating parameters accordingly. The system includes voltage sensing circuitry that identifies the input voltage level and modifies control parameters, PWM duty cycles, and power delivery characteristics to optimize performance and ensure stable operation in both voltage configurations. This parameter adaptation allows a single gate mechanism design to reliably operate across different voltage standards.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures consistent motor operation, reduces mechanical stress, extends brush and commutator life, and allows for a single gate mechanism to operate effectively in both 12 and 24 VDC systems, providing smooth and fluid movement without jerking or whipping, thus enhancing reliability and longevity.
Implementation Method 1
A voltage reduction circuit that steps down incoming DC voltage from 12 VDC to 30 VDC to 12 VDC
Implementation Method 2
using a brushless DC motor with Hall effect sensors and PWM control for smooth and consistent gate movement
Implementation Method 3
using a brushless DC motor with Hall effect sensors
Data Source
AI summary
A highway grade crossing gate system comprises a gate arm configured to rotate 90 degrees from a horizontal position to a vertical position and vice versa and a highway grade crossing gate mechanism coupled to the gate arm for controlling rotation of the gate arm without mechanical user adjustments but rather use user angle and time inputs/outputs. The highway grade crossing gate mechanism includes a DC motor to drive the gate arm up and down and a voltage reduction circuit to receive an input voltage from a battery and reduce the input voltage. The highway grade crossing gate mechanism further includes a human machine interface (HMI) to receive a plurality of programmable set points as operational variables for operation of the gate arm without manually adjustable cams on a main shaft that move contacts to open or close at some preset angular rotation. The highway grade crossing gate mechanism further includes a control printed circuit board (PCB) coupled to the HMI, the voltage reduction circuit, the brake, and the DC motor. The control PCB to receive an output based on an angular position of the gate arm as a position indication to have the control PCB provide an output for the operation of the gate arm.