Rotary Slide Valve Position Feedback With Integrated Magnetic Sensing
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Solution Overview
Problem
Existing rotary slide valves in motor vehicles lack precise position feedback, making sensitive adjustments challenging due to high gear ratios, and require additional installation space for sensors.
Innovation Solution
A valve device with a sensor magnet attached to the output shaft of the drive motor, providing position feedback without additional electronics, using a containment shell to separate the sensor magnet from external influences, allowing precise adjustment of the control body within the existing electronics compartment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is added to the motor side for position feedback, then position detection is enabled, but the position accuracy is insufficient due to high gear ratios
Solution Approach 1:
The patent implements a position feedback system using a sensor magnet mounted on the output shaft and a magnetic sensor on the stator. This feedback mechanism directly measures the control element's position, enabling precise control despite high gear ratios in the harmonic drive system
Solution Approach 2:
The patent replaces complex mechanical position measurement methods with a magnetic field-based sensing system. The sensor magnet and magnetic sensor provide non-contact position detection, eliminating the need for additional mechanical encoders or position sensors while achieving high measurement precision
2Measurement precision
If a position feedback system is added, then precise adjustment is enabled, but additional installation space is required
Solution Approach 1:
The patent merges the position feedback system with the existing motor structure. The sensor magnet is integrated onto the output shaft, and the magnetic sensor is mounted on the stator, utilizing the motor's existing space without requiring additional installation volume outside the motor housing
Solution Approach 2:
The position feedback components are nested within the existing motor structure. The sensor magnet is placed on the output shaft inside the motor housing, and the magnetic sensor is positioned on the stator, effectively nesting the feedback system within the motor's existing spatial envelope
3Measurement precision
If the sensor magnet is exposed to the medium, then position feedback is provided, but reliability decreases due to chemical influences
Solution Approach 1:
The patent extracts the sensor magnet from the medium-exposed environment by mounting it on the output shaft inside the motor housing, while the magnetic sensor is positioned on the stator in a protected area. This separation removes the sensitive magnetic sensor from chemical influences while maintaining position feedback functionality
Solution Approach 2:
The patent uses the motor housing and stator structure as intermediaries to protect the magnetic sensor from chemical influences. The sensor magnet can be sealed or protected while still providing magnetic field signals through the stator, acting as a mediator between the controlled medium and the sensitive sensor
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 and sensitive adjustment of the control body with minimal additional installation space, maintaining a simple structure and ensuring long-term reliability of position feedback.
Implementation Method 1
a sensor magnet (62) fixed to the output shaft (22) in a rotationally fixed manner and communicating with a magnetic sensor (66) for position feedback
Data Source
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AI summary
The invention relates to valve devices for motor vehicles, comprising a flow housing (10) which has at least one inlet (12), at least one outlet (14), a drive motor (34) with a stator (38) and a rotor (40), and a gearing mechanism (46). The gearing mechanism can be rotated by the drive motor (34) and is used to rotate a regulating body (20) by means of an output axis (22) or output shaft (22), on which the regulating body (20) is at least rotationally fixed and via which the regulating body (20) is supported, said regulating body being used to regulate a fluidic connection between the at least one inlet (12) and the at least one outlet (14). In order to be able to reach an exact rotational position, the output shaft or axis (22) extends from the regulating body (20) at least into the rotor (40) of the drive motor (34) through the gearing mechanism (46), and a sensing magnet (62) which communicates with a magnet sensor (66) is at least rotationally fixed to the output shaft (22).