Chemical Dispensing Bus Control for Pump Wear Compensation
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Solution Overview
Problem
Current chemical dispensing systems for commercial washing machines face challenges such as complex wiring, inaccurate chemical dispensing, high maintenance burdens, and potential pump failures due to wear and tear, leading to inefficiencies and increased costs.
Innovation Solution
A chemical dispensing system utilizing a serial data bus network for communication between controllers, pump calibration data pre-loaded into pump controllers, and real-time monitoring of squeeze tube wear to ensure accurate and reliable dispensing, reducing the need for manual calibration and minimizing maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated signal lines are used to connect the controller to each washing machine trigger signal output and pump, then the controller can directly control the pumps, but the number of wires and controller input ports increases significantly, making installation cumbersome
Solution Approach 1:
Multiple dedicated signal lines are merged into a single serial data bus that carries all control signals and data between the controller and pumps. The controller communicates with multiple pumps through this shared bus using standardized protocols, eliminating the need for separate wires for each connection while maintaining reliable control through digital communication protocols including error checking and data validation
Solution Approach 2:
The serial data bus serves multiple functions simultaneously: it transmits control signals from the controller to pumps, carries feedback data from pumps to the controller, provides power in some implementations, and enables diagnostic communications. This multi-functional approach replaces multiple dedicated single-purpose signal lines with one versatile communication infrastructure
2Ease of operation
If the controller directly activates and deactivates each pump without feedback, then the system is simpler to operate, but the controller receives no feedback regarding whether the pump is actually dispensing the desired amount of product
Solution Approach 1:
The system implements bidirectional communication where pumps send status feedback to the controller through the serial data bus. This feedback includes information about pump operation status, actual dispensing amounts, error conditions, and diagnostic data. The controller uses this feedback to verify proper operation, adjust dispensing parameters, and maintain accurate chemical delivery without requiring complex manual monitoring
Solution Approach 2:
The system replaces manual calibration and monitoring procedures with automated electronic feedback mechanisms. Pump controllers continuously report operational data to the system controller, which automatically adjusts parameters and detects issues without requiring physical measurement or manual intervention, thereby maintaining simplicity while achieving precise measurement
3Object-affected harmful factors
If peristaltic pumps are used to minimize contact with chemical products, then operator safety is improved, but the pumps require calibration measurements on each pump during installation, greatly increasing installation time and expense
Solution Approach 1:
Pump calibration data and operational parameters are pre-configured in the pump controllers during manufacturing or initial setup. The system includes pre-programmed dispensing profiles and calibration information that eliminate the need for time-consuming on-site calibration measurements. Installers simply connect pre-calibrated pumps to the system, and the controllers automatically apply the stored calibration data, dramatically reducing installation time while maintaining the safety benefits of peristaltic pump design
4Device complexity
If the controller merely switches pumps on and off for an expected time to provide desired chemical amount, then the control system is simpler, but the system cannot determine if the pump is dispensing the correct amount of product
Solution Approach 1:
The serial data bus enables continuous feedback communication between pumps and controller. Pump controllers report actual dispensing data, operational status, and diagnostic information to the system controller. This feedback allows the controller to verify that pumps are dispensing the correct amounts, detect deviations from expected performance, and automatically adjust parameters to maintain precision without requiring complex control logic
Solution Approach 2:
The system replaces complex mechanical feedback mechanisms (such as flow meters, sensors, and manual measurement devices) with electronic feedback through the serial data bus. The pump controllers internally track and report dispensing data, allowing the system to achieve precise control and verification through software-based monitoring rather than additional hardware complexity
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
The system achieves improved accuracy and reliability in chemical dispensing, reduces installation time and costs, and extends the service life of squeeze tubes by providing timely replacement notifications and adjusting dispensing parameters for wear and aging.
Implementation Method 1
Peristaltic pumps of this type include a flexible tube (or squeeze tube) and a rotor with one or more rollers located in a pump chamber. The one or more rollers compress a section of the squeeze tube against a wall of a pump chamber, pinching off the section of squeeze tube. When the rotor is rotated, the location of the pinched section of the squeeze tube moves along the length of the tube, thereby forcing, or pumping, fluid through the tube.
Data Source
AI summary
System and method for dispensing product to a washing machine. A chemical dispensing system includes a system controller, machine interface, and pump controller that communicate through serial data buses. The system controller provides a user interface, retrieves washing machine status information from the machine interface, and issues product dispensing commands to the pump controller. The pump controller monitors pump status and dispenses product in response to commands from the system controller. The pump controller: (1) determines pump activation periods based on calibration data stored in a pump controller memory; (2) tracks pump usage and adjusts the activation period to compensate for pump wear as the pump ages; (3) disables the pump if conditions exists that preclude operating the pump; (4) monitors product levels, and (5) reports pump status to the system controller. Integral channels are included in the pump housing to provide stress relief to a squeeze tube.