Duplex Acceleration Sensor for Wheel Adhesion Detection
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Solution Overview
Problem
Existing systems fail to accurately and timely detect a loss of grip in vehicle wheels, particularly at high speeds, leading to delayed intervention in unstable driving situations, as they are insensitive to ultra-short rotational fluctuations and do not utilize direct acceleration measurements from individual wheels.
Innovation Solution
An acceleration sensor with a tubular structure and a movable mass, driven by magnetic forces, is mounted on the vehicle wheel to directly detect changes in wheel acceleration, providing high sensitivity and immediate detection of loss of adhesion without requiring evaluation of other signals, and is designed to withstand mechanical and environmental loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If indirect acceleration sensors or computing circuits are used to detect wheel slip, then the system complexity is reduced, but the detection precision and response time are insufficient to detect ultra-short rotational fluctuations
Solution Approach 1:
The patent replaces indirect computational detection methods with a direct mechanical acceleration sensor that measures wheel acceleration physically. This mechanical substitution enables direct detection of ultra-short rotational fluctuations with high precision while maintaining manageable system complexity through a dedicated sensor rather than complex signal processing circuits.
2Device complexity
If indirect detection methods are used, then the device structure is simplified, but the response time is delayed and cannot provide early warning before vehicle instability
Solution Approach 1:
The acceleration sensor provides preliminary detection of wheel acceleration changes before the vehicle actually loses stability. By directly measuring acceleration at the wheel level, the system can issue early warnings to the driver before instability occurs, enabling preventive action rather than reactive correction.
3Measurement precision
If acceleration sensors are mounted on individual wheels, then the measurement precision for individual wheel adhesion is improved, but the device complexity and installation complexity increase
Solution Approach 1:
The patent segments the detection system by mounting individual acceleration sensors on each wheel, allowing independent measurement of adhesion conditions for each wheel. This segmentation enables precise detection of individual wheel slip events while the modular sensor design keeps each unit simple and manageable.
4Measurement precision
If the acceleration sensor is designed with high sensitivity for direct acceleration measurement, then the detection capability is improved, but the sensor becomes more sensitive to mechanical loads and environmental factors
Solution Approach 1:
The sensor design incorporates local quality adaptations by positioning the acceleration sensor specifically on the wheel assembly where it can directly measure wheel acceleration while being protected from excessive mechanical loads. The sensor's local placement and mounting strategy balance high detection sensitivity with resistance to harmful mechanical and environmental factors.
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
The sensor effectively detects loss of grip at high speeds, enabling early warning to the driver and improving accident prevention by providing reliable and immediate feedback on wheel adhesion, even in transitional phases on slippery or icy surfaces.
Implementation Method 1
a magnet arrangement configured to counteract a movement of the mass from a rest position by means of a magnetic force exerted on the mass
Implementation Method 2
the tube is arranged on the vehicle wheel such that a movement of the mass from the rest position occurs when the acceleration of the vehicle wheel (in the direction of rotation of the vehicle wheel) changes
Data Source
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AI summary
The invention relates to an acceleration sensor, in particular a duplex acceleration sensor, an arrangement, and a method for detecting a loss of traction of a vehicle wheel (3). The acceleration sensor has a tube (5) with a longitudinal axis forming a circular arc segment and with two closed ends. A mass (15; 315) is movably arranged within the tube (5) and in the longitudinal direction of the tube (5). A magnet arrangement (17; 203; 205; 317) is configured to counteract a movement of the mass (15; 315) from a rest position (25) by means of a magnetic force exerted on the mass (15; 315), and a readout unit (608) is configured to detect a movement of the mass (15) from the rest position (25).