Drawer Oven Door Control Using Phased Rotation Pulse Detection
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Solution Overview
Problem
Existing drawer-type cooking devices face challenges in accurately detecting the opening and closing direction of the door during manual operations, especially when the door is not in the fully open or fully closed position, leading to potential safety issues and reduced usability due to the need for multiple position sensors and the risk of high-speed door malfunctions.
Innovation Solution
A method utilizing a rotation sensor that generates two rotation pulses with different phases to determine the motor's rotation direction, allowing for accurate detection of the door's opening and closing direction at any position, and a control unit to manage the motor's operation based on these signals, reducing the need for multiple sensors and enhancing safety by controlling speed and preventing high-speed malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple position sensors are used to detect door position and direction, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The rotation sensor serves multiple functions: it detects both the position and the opening/closing direction of the door, replacing what would traditionally require multiple separate sensors. This multi-functional approach reduces the total number of sensors while maintaining detection accuracy
Solution Approach 2:
The patent combines position detection and direction detection into a single rotation sensor system. By merging these two detection functions into one sensor, the system achieves comprehensive door state monitoring without the complexity of multiple separate sensors
2Ease of operation
If the door is allowed to move freely without speed control, then ease of operation is improved, but safety deteriorates due to risk of high-speed malfunctions
Solution Approach 1:
The control unit continuously monitors the rotation sensor signals and provides feedback control on motor speed. Based on the detected door position and movement state, the control unit adjusts the motor drive to prevent excessive speed, thereby maintaining safety while allowing free operation
Solution Approach 2:
The system dynamically adjusts motor speed based on real-time door position and operational state. The speed control is not fixed but adapts to the current situation, allowing fast movement when safe and slowing down when approaching limits, thus balancing ease of operation with safety
Data Source
AI summary
A drawer-type cooking device and a method for controlling opening and closing of a door thereof, in which an opening/closing direction and an absolute position of a door by a manual opening/closing operation by a user can be detected with a simple structure even when the door is in a door-open state in an intermediate position, is provided. A rotation sensor 26 is disposed in relation to an output shaft of a motor 25 for driving a door capable of opening and closing an opening of a cooking device body in an opening/closing direction. A microcomputer 20 controls drive of the motor 25 including a rotation direction by receiving an input of a detection signal of the rotation sensor 26,which is a sensor for generating two rotation pulses having different phases (for example, pulse train signals with a 120-degree difference) from the motor. A control device can determine the rotation direction of the motor 25 based on the two rotation pulses therefrom.