Wheel Force Detection with Axle Sensor Extraction
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Solution Overview
Problem
Existing wheel component force detecting apparatuses face challenges in accurately measuring load on wheels with in-wheel motors due to magnetic interference, making it difficult to achieve vehicle miniaturization and precise load detection.
Innovation Solution
A wheel component force detecting apparatus with a pair of symmetrical sensing units, each comprising a cylinder and strain sensors, is integrated inside the wheel, forming bridge circuits to accurately detect component forces while minimizing magnetic interference effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the in-wheel motor is disposed inside the wheel to achieve miniaturization, then vehicle size is reduced, but the strain sensor on the hub is affected by the magnetic field of the in-wheel motor, making accurate load detection difficult
Solution Approach 1:
The strain sensor is extracted from the hub and relocated to the axle connector, separating it from the magnetic field interference zone of the in-wheel motor. This allows the motor to be disposed inside the wheel for miniaturization while the sensor remains in a position where it can accurately detect load forces without magnetic interference.
Solution Approach 2:
The axle connector serves as an intermediary structure that transmits load forces from the wheel to the strain sensor. By positioning the sensor on the axle connector rather than the hub, the system mediates between the need for compact motor integration and accurate force measurement, as the axle connector is less affected by the motor's magnetic field.
2Measurement precision
If the strain sensor is disposed on the hub to detect load, then load detection is possible, but the in-wheel motor must be disposed outside the hub, preventing vehicle miniaturization
Solution Approach 1:
The strain sensor is extracted from the hub and relocated to the axle connector, enabling the in-wheel motor to be disposed inside the wheel for miniaturization while maintaining accurate load detection capability through the sensor's new position on the axle connector.
Solution Approach 2:
The solution moves the sensor from a radial position on the hub to an axial position on the axle connector, changing the spatial dimension of sensor placement. This dimensional shift allows the motor to be integrated inside the wheel while the sensor remains in a location suitable for accurate force measurement.
3Measurement precision
If the in-wheel motor is disposed outside the hub for accurate sensor placement, then load detection is accurate, but vehicle miniaturization is difficult
Solution Approach 1:
The strain sensor is extracted from the hub and repositioned on the axle connector, allowing the in-wheel motor to be integrated inside the wheel. This simplifies the overall vehicle structure by enabling compact motor integration while maintaining accurate load detection through the sensor's relocated position.
Solution Approach 2:
The solution merges the in-wheel motor and sensor system into a more compact integrated arrangement by positioning the sensor on the axle connector rather than the hub. This merging enables the motor to be disposed inside the wheel, reducing vehicle size and simplifying the power transmission structure.
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 solution enables accurate detection of wheel loads and component forces, facilitating vehicle miniaturization and improved attitude control, with enhanced precision and reduced magnetic interference impact.
Implementation Method 1
The component force detector includes a plurality of strain sensors disposed on the cylinder
Data Source
AI summary
A wheel component force detecting apparatus for detecting a component force on a wheel includes a cylindrical axle flange, an electric motor, and a wheel unit. The electric motor includes a stator and an armature. The wheel component force detecting apparatus includes a pair of sensing units each including a cylinder and a bridge circuit. The cylinder is mounted outside the circumferential surface of the axle flange and has a first end fixed to the axle flange and a second end fixed to the stator. The bridge circuit includes a plurality of strain gages disposed on the cylinder. The pair of sensing units is symmetrical in the axial direction of the axle flange with respect to the stator.