Permanent Magnet Motor Direction Sensor for Engine Restart
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Solution Overview
Problem
Existing systems for starting single-cylinder internal combustion engines face challenges in determining a fixed inverse rotation angle or time for re-starting due to the wide spacing of adjacent compression phases, leading to inefficient engine re-starting and excessive resource usage by the monitoring unit managing multiple sensors.
Innovation Solution
An electric motor with permanent magnets and a starting control system that includes a stator with phase sensors and a direction sensor with Hall effect, providing a signal for the rotation direction of the rotor, connected to the monitoring unit of the internal combustion engine to simplify and enhance engine management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sensors (three phase sensors and additional direction sensor) are used to detect rotation direction, then the reliability of engine re-starting is improved, but the device complexity and resource usage of the monitoring unit increase
Solution Approach 1:
The patent divides the sensing function into two independent parts: three phase sensors for detecting phase signals and one additional direction sensor for detecting rotation direction. This segmentation allows each sensor type to specialize in its specific detection task, improving overall reliability while keeping the monitoring unit's processing organized and manageable.
Solution Approach 2:
The additional direction sensor serves multiple purposes: it detects rotation direction during inverse rotation, identifies compression phase positioning, and provides feedback for controlling the electric motor's operation. This multi-functionality improves reliability without requiring separate sensors for each function, thus limiting the increase in device complexity.
2Ease of operation
If a fixed inverse rotation angle or time is used for single-cylinder engine re-starting, then the control procedure is simplified, but the productivity and efficiency of engine re-starting deteriorate due to the wide spacing of compression phases
Solution Approach 1:
The patent implements dynamic control of the inverse rotation angle based on real-time feedback from the direction sensor and phase sensors. Instead of using a fixed angle, the system adjusts the rotation angle dynamically to ensure the piston reaches the optimal position for re-starting, thereby improving productivity while maintaining ease of operation through automated adjustment.
Solution Approach 2:
The direction sensor provides continuous feedback on the rotation direction and position of the crankshaft. This feedback enables the monitoring unit to calculate and adjust the inverse rotation angle dynamically, ensuring that the piston is positioned optimally for re-starting. The feedback mechanism resolves the contradiction by automating the complex calculations, keeping the control procedure simple for the operator while achieving high re-starting efficiency.
3Device complexity
If the monitoring unit manages three phase sensors only, then the device complexity is reduced, but the measurement precision of rotation direction deteriorates
Solution Approach 1:
The patent introduces an asymmetric sensor configuration where one additional direction sensor is added to the three symmetric phase sensors. This asymmetric arrangement specifically targets the need for precise rotation direction detection, as the additional sensor provides dedicated functionality for this purpose, improving measurement precision without requiring a complete reconfiguration of all sensors.
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
This configuration allows for more effective and simplified management of the internal combustion engine, ensuring efficient re-starting by accurately determining the rotation direction and optimizing resource usage in the monitoring unit.
Implementation Method 1
a direction sensor with Hall effect, providing a signal for the rotation direction of the rotor
Implementation Method 2
an electric motor with permanent magnets comprising a stator, in the reinforcement of which three phase sensors are provided
Data Source
AI summary
An electric motor for starting internal combustion engines and a relative starting control system of such engine comprising said electric motor of the type with permanent magnets allows a more effective and simpler management of the internal combustion engine thereto the electric motor is connected, wherein a monitoring unit of the electric motor (EMU) and a monitoring unit of the internal combustion engine (ECU) are provided, wherein the electric motor comprises a direction sensor (18) providing a signal representing the rotation direction of the rotor (12) of the electric motor, which is connected to said monitoring unit of the internal combustion engine (ECU).