Chemical Delivery Monitoring for Closed-Loop Car Wash Dilution
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Solution Overview
Problem
Automated car wash systems face challenges in accurately tracking and controlling chemical usage due to varying process variables and the corrosive nature of cleaning chemicals, leading to excessive chemical discharge into the environment and inefficient resource management.
Innovation Solution
A system that monitors chemical usage on a per-car basis, converting data into digital information for closed-loop control, using hyper-concentrates, RFID tags, and internet-based software to manage and adjust dilution rates, and restrict access to prevent unauthorized adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional venturi eductors and high volume dosing pumps are used to dispense cleaning chemicals, then large quantities of chemicals can be handled, but the dilution rate varies significantly and cannot be accurately tracked
Solution Approach 1:
The patent replaces traditional mechanical flow measurement devices with electromagnetic flow meters that use electromagnetic fields to measure fluid flow. This substitution eliminates mechanical wear from corrosive chemicals while providing precise digital measurements of chemical usage, resolving the contradiction between handling capacity and measurement accuracy.
Solution Approach 2:
The system implements closed-loop feedback by continuously monitoring chemical usage with flow meters and dosing pumps, comparing actual usage against target dilution rates, and automatically adjusting pump speeds to maintain precise control. This feedback mechanism enables accurate tracking while maintaining large handling capacity.
2Measurement precision
If sophisticated fluid monitoring devices are used to track chemical usage, then measurement precision improves, but the corrosive cleaning chemicals damage the monitoring devices
Solution Approach 1:
The patent introduces an intermediary magnetic coupling mechanism that transfers rotational speed information from the dosing pump impeller to the motor shaft without direct mechanical contact. This magnetic coupling allows measurement of pump speed (and thus chemical delivery rate) while isolating the monitoring electronics from direct exposure to corrosive chemicals, maintaining both precision and reliability.
Solution Approach 2:
The system replaces mechanical sensors that would be directly exposed to corrosive chemicals with electromagnetic flow meters and magnetic coupling mechanisms. These electromagnetic-based measurement systems provide accurate chemical usage tracking without requiring physical contact with the corrosive fluid, thereby maintaining device durability.
3Device complexity
If manual monitoring and adjustment of dilution rates is used, then device complexity is reduced, but productivity and chemical usage control efficiency decrease
Solution Approach 1:
The system implements self-service automation where the control system automatically monitors chemical usage, calculates required adjustments, and modifies pump speeds without operator intervention. The system serves itself by continuously optimizing chemical delivery based on real-time measurements, dramatically improving control efficiency while adding only moderate complexity through integrated sensors and controllers.
Solution Approach 2:
The patent implements automated feedback control loops that continuously monitor chemical usage and automatically adjust dosing pump speeds to maintain target dilution rates. This eliminates manual monitoring and adjustment, significantly improving productivity and chemical usage control efficiency while the feedback automation manages the added system complexity.
4Ease of manufacture
If open-loop control processes are used to monitor chemical input, then cost is reduced, but measurement precision and reliability of chemical usage data deteriorate
Solution Approach 1:
The patent implements closed-loop feedback control that continuously measures actual chemical usage with flow meters and dosing pumps, compares it against target values, and automatically adjusts pump speeds to correct deviations. This feedback mechanism significantly improves measurement precision and reliability of chemical usage data compared to open-loop systems, while the use of standardized industrial sensors and controllers keeps costs manageable.
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
Enables precise chemical usage tracking and control, reducing environmental impact by minimizing chemical discharge and optimizing resource management through real-time monitoring and digital data processing.
Implementation Method 1
The eductor crudely dilutes the concentrated cleaning chemical with the process water as the water flows through the eductor to form an aqueous cleaning solution
Implementation Method 2
RFID tags, and internet-based software to manage and adjust dilution rates
Data Source
AI summary
A system for controlling and monitoring the chemical usage in a car wash systems that form an aqueous cleaning solution by diluting a cleaning chemical concentrate in a process water stream to form. Level sensors are mounted to the bulk containers containing the chemical concentrate to measure and track the usage of the chemical concentrates. The usage data is collected and used to adjust flow rate controllers controlling the dilution of the concentrate into the process water stream. The system can be integrated into continuous processes where the aqueous cleaning solution is dispensed immediately after production and batch processes where the cleaning solution is stored temporarily before being dispensed onto a vehicle.