Conveyor Toaster Speed Control for Consistent Cooking
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Solution Overview
Problem
Conveyor toasters face challenges in accurately controlling the cooking degree of food products due to variations in temperature and product load, leading to inefficiencies and potential overcooking or undercooking.
Innovation Solution
A controller is programmed to adjust the cook time and conveyor speed based on estimated temperature and product load, using sensors and empirical constants to optimize cooking conditions, with features like standby mode and heat percentage modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the conveyor speed is controlled based on temperature and product load, then cooking consistency and food quality are improved, but device complexity increases
Solution Approach 1:
The controller continuously monitors temperature sensors and product load sensors, then dynamically adjusts conveyor motor speed based on this feedback. This closed-loop control ensures cooking consistency by compensating for temperature variations and different product loads, resolving the contradiction between cooking precision and control complexity.
Solution Approach 2:
The system uses sensors to automatically detect product presence and temperature conditions, then self-adjusts the conveyor speed without manual intervention. This automated self-regulation improves cooking consistency while minimizing the need for complex manual control mechanisms.
2Loss of energy
If the conveyor operates in standby mode with reduced heat and stopped conveyor, then energy consumption is reduced, but cooking time increases when exiting standby
Solution Approach 1:
When food product is detected, the system pre-heats the cooking chamber and pre-adjusts conveyor speed before the actual cooking begins. This preliminary preparation reduces the time penalty when exiting standby mode while maintaining energy savings during idle periods.
Solution Approach 2:
The system dynamically transitions between standby and active modes, adjusting heat percentage and conveyor speed based on real-time detection of product presence. This dynamic operation optimizes the balance between energy conservation during idle periods and quick recovery when cooking is needed.
3Productivity
If the conveyor speed is increased to improve productivity, then output increases, but cooking precision decreases leading to overcooking or undercooking
Solution Approach 1:
The conveyor speed is dynamically adjusted based on detected temperature conditions and product load characteristics. The system automatically optimizes speed for each cooking scenario, maintaining precision regardless of productivity requirements. This resolves the contradiction by making speed a variable parameter rather than a fixed setting.
Solution Approach 2:
The controller changes multiple parameters simultaneously - conveyor speed, heat percentage, and cook time - based on sensor feedback. By coordinating changes in these parameters, the system maintains cooking precision even when operating at higher productivity levels with increased conveyor speeds.
Data Source
AI summary
A conveyor oven comprising a housing defining a cook chamber and a heating element adjacent the cook chamber. A controller is programmed to control a cook time based upon a current estimated temperature in the oven, wherein the current estimated temperature is a function of a heat power input during a previous time period and can also be a function of a previous estimated temperature. The oven can further include a conveyor and a motor coupled to the conveyor, wherein the controller is programmed to control a cook time of the conveyor. The controller can also be programmed to control the cook time based upon a product loading condition. The oven can further include a presence sensor for detecting the presence of food in the oven and for providing a corresponding signal. Preferably, the calculation is an eye calculation that is a function of a previous eye calculation.