Concrete Dispensing Control via CAN-Bus Segmentation
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Solution Overview
Problem
Concrete plants face challenges in accurately measuring and dispensing admixtures due to pre-mixed admixtures not being modified for varying environmental and material conditions, leading to inefficiencies and potential environmental concerns from leaks, and existing batch panels provide limited control and monitoring capabilities.
Innovation Solution
Implementing distributed intelligent controllers with field boxes that communicate through a CAN-bus network, allowing for real-time monitoring and control of concrete plant equipment, including admixture flow detection and inventory management, and enabling wireless communication to prevent data loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pre-mixed admixtures are used without modification, then dispensing is simplified, but accuracy of measurement and adaptability to varying conditions deteriorates
Solution Approach 1:
The system segments the admixture dispensing process into multiple measurement points: a primary flow meter measures total admixture flow, while a secondary flow meter or level sensor measures actual delivery to the batch. This segmentation allows detection of discrepancies between intended and actual dispensing, improving measurement accuracy while maintaining operational simplicity.
Solution Approach 2:
The system implements feedback through flow meters that continuously monitor admixture delivery and compare actual amounts against recipe requirements. When discrepancies are detected (such as leaks or insufficient delivery), the system generates alerts and can adjust dispensing parameters, ensuring accurate measurement while maintaining ease of operation.
2Reliability
If distributed intelligent controllers with CAN-bus network are implemented, then monitoring and control capabilities are improved, but device complexity increases
Solution Approach 1:
The field boxes serve multiple functions: they control dispensing equipment, monitor flow meters, manage inventory levels, and provide communication interfaces. This multi-functionality consolidates what would otherwise require separate systems, improving reliability while managing complexity through integration rather than proliferation of components.
Solution Approach 2:
The CAN-bus network acts as an intermediary layer between various control devices and the central system, providing standardized communication protocols that simplify integration. This mediator approach allows diverse equipment to communicate efficiently without requiring complex point-to-point wiring or custom communication interfaces for each device.
3Reliability
If wireless communication is implemented, then data loss is prevented and reliability is improved, but use of energy and device complexity increase
Solution Approach 1:
The wireless communication system transmits data periodically at optimized intervals rather than continuously, reducing energy consumption while maintaining data integrity. Critical data such as flow meter readings and inventory levels are transmitted at regular intervals, and the system uses acknowledgment protocols to ensure no data is lost, balancing reliability with energy efficiency.
Data Source
AI summary
A control system for a concrete plant adds intelligent capabilities in the concrete plant that may enhance safety, localize control of the concrete plant, and assist with troubleshooting. The control system may also enhance accuracy for determining an amount of mixed concrete dispensed, or amounts of concrete ingredients to dispense, and may eliminate the need for equipment used to verify the amount of mixed concrete or concrete ingredients dispensed.