Industrial Vehicle Retarder Control Using Sensor Feedback
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Solution Overview
Problem
Industrial vehicles, such as heavy-duty haul trucks, face challenges in controlling speed due to rudimentary speed limit placards that do not account for actual road conditions, leading to uncertainties in retardation force requirements, which can result in potential runaway conditions and excessive wear on friction braking systems.
Innovation Solution
A controller system that uses sensors to determine required and available retardation forces, providing a relative display to operators, allowing for efficient control and reducing the reliance on skilled drivers, by integrating speed, payload, and inclination sensors with an electric retarder device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional static placards are used to provide speed limits, then the device complexity is reduced, but the measurement precision of actual speed limits under varying road conditions deteriorates
Solution Approach 1:
The patent transitions from static placards to a dynamic control system that continuously adjusts speed limits based on real-time sensor data. The controller dynamically calculates appropriate speed limits by processing inputs from inclination sensors, payload sensors, and speed sensors, allowing the system to adapt to changing road conditions, grades, and vehicle loads rather than relying on fixed predetermined values.
Solution Approach 2:
The system implements feedback by continuously monitoring actual vehicle speed, road grade, and payload through sensors, then using this information to adjust the displayed speed limit and retarder control. The controller receives feedback from speed sensors and inclination sensors to determine whether the vehicle is approaching unsafe speeds and adjusts the retarder application accordingly, creating a closed-loop control system.
2Ease of operation
If no retarder control system is implemented, then the ease of operation is improved, but the reliability of preventing runaway conditions deteriorates
Solution Approach 1:
The retarder control system operates semi-autonomously by automatically monitoring vehicle conditions through sensors and adjusting retarder application based on pre-programmed control logic. The system serves itself by continuously calculating appropriate retardation levels and applying them without requiring constant driver intervention, while still providing a display to inform the operator of the system's actions and current status.
Solution Approach 2:
The patent replaces the purely mechanical friction braking system with an electric retarder control system that uses electronic sensors and controllers to manage vehicle speed. The electric retarder provides a more reliable and controllable means of speed management compared to traditional mechanical brakes alone, reducing the risk of runaway conditions through precise electronic control rather than relying solely on driver skill and mechanical braking.
3Reliability
If friction braking system is used frequently to control speed, then the speed control reliability is improved, but the duration of action of the braking system deteriorates due to increased wear
Solution Approach 1:
The patent substitutes the mechanical friction braking system with an electric retarder system for primary speed control. The electric retarder uses electromagnetic forces to provide retarding torque, eliminating the need for frequent friction brake application. This substitution maintains reliable speed control while dramatically reducing wear on brake pads and extending the service life of the friction braking system.
Solution Approach 2:
The system changes the operational parameters by introducing electric retardation as the primary speed control mechanism rather than relying on mechanical friction brakes. By adjusting electrical parameters (current, voltage) to the retarder motor, the system can precisely control the retarding force applied to the wheels, providing reliable speed control without the wear and tear associated with frequent friction brake use.
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 enables more precise control of industrial vehicles, reducing the risk of runaway conditions and extending the service life of friction braking systems by providing real-time feedback on retardation force availability and requirements.
Implementation Method 1
The wheel motor includes an electric retarder device for applying a retardation force to the wheel
Data Source
AI summary
Industrial vehicles that include a speed sensor configured to generate a speed sensor signal, a payload sensor configured to generate a payload sensor signal, an inclination sensor configured to generate an inclination sensor signal, a wheel motor connected to a wheel of the industrial vehicle, and a controller. The wheel motor includes an electric retarder device for applying a retardation force to the wheel. The controller is configured to receive the speed sensor signal, receive the payload sensor signal, receive the inclination sensor signal, determine a required retardation force for the industrial vehicle based on the payload sensor signal and the inclination sensor signal, determine an available retardation force for the industrial vehicle based on the speed sensor signal, and generate an output indicating the required retardation force for the industrial vehicle relative to the available retardation force for the industrial vehicle.