Wheel Speed Sensor Temperature Comparison for Wheel-End Fault Detection
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Solution Overview
Problem
Existing methods for identifying temperature changes at wheel ends of vehicles are limited in their ability to detect fault-induced temperature rises without additional sensors, particularly in regions where direct temperature measurement is not feasible.
Innovation Solution
Integrate temperature sensors into wheel speed sensors at each wheel end, allowing indirect measurement of temperature changes via the sensitivity of the wheel speed sensor to an alternating magnetic field generated by a magnet wheel, and compare sensor temperatures to detect deviations indicative of faults such as overheating or bearing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate temperature sensors are arranged on brake components, then temperature information can be obtained, but device complexity increases and additional sensors are required
Solution Approach 1:
The patent combines the temperature sensor and wheel speed sensor into a single integrated unit. The temperature sensor is positioned within the wheel speed sensor housing, allowing both temperature and wheel speed measurements to be performed by a single sensor assembly rather than requiring separate sensors, thereby reducing device complexity while maintaining measurement precision
Solution Approach 2:
The wheel speed sensor is designed to perform multiple functions: it measures wheel speed through magnetic field detection and simultaneously measures temperature through an integrated temperature sensor. This multi-functional approach eliminates the need for separate temperature sensing components, resolving the contradiction between measurement capability and device complexity
2Reliability
If additional temperature sensors are installed at wheel ends, then fault detection capability is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent merges the temperature sensing function with the existing wheel speed sensor, so that temperature measurement capability is added without requiring additional standalone temperature sensors. The integrated sensor performs both functions, improving reliability through enhanced fault detection while avoiding the complexity and cost of adding separate sensing devices
Solution Approach 2:
The integrated sensor unit provides universal monitoring capabilities by simultaneously detecting wheel speed and temperature, enabling comprehensive fault detection (overheating, bearing damage, brake issues) through a single sensor assembly rather than requiring multiple specialized sensors
3Device complexity
If temperature sensors are integrated into wheel speed sensors, then device complexity is reduced, but temperature measurement precision may be affected by sensor positioning
Solution Approach 1:
The temperature sensor is positioned at a specific location within the wheel speed sensor housing that is thermally coupled to the wheel end components. This localized positioning ensures the sensor measures the temperature of the specific component of interest (brake disk, bearing, or wheel end housing) with sufficient precision for fault detection, while the integrated design maintains low device complexity
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 the detection of fault-induced temperature changes, including overheating and bearing damage, without additional sensors by utilizing integrated temperature sensors in wheel speed sensors, providing robust fault identification through comparative analysis and adaptive deviation limit settings.
Implementation Method 1
each wheel speed sensor has a temperature sensor, that is, as an integral component part of the wheel speed sensor, wherein the temperature sensor is configured to measure and output a sensor temperature in a sensing region
Implementation Method 2
a magnet wheel fitted on the rotating wheel generates in the associated wheel speed sensor an alternating magnetic field, which is evaluated by the wheel speed sensor in order to deduce the wheel speed. The wheel speed sensor has a temperature sensor, for instance in order to adjust the sensitivity to the alternating magnetic field generated by the magnet wheel, because this sensitivity is temperature dependent
Implementation Method 3
if there is sufficient heat transfer from the surroundings of the wheel end to the temperature sensor integrated in the wheel speed sensor, for example via the air or also by heat transfer on components of the wheel end
Data Source
AI summary
A method is for identifying fault-induced temperature changes at wheel ends of a vehicle. At least two of the wheel ends have a wheel speed sensor having a temperature sensor configured to measure around its position a sensor temperature in a sensing region. The method includes: retrieving a first sensor temperature measured by a first temperature sensor at a first wheel end; and retrieving a second sensor temperature measured by a second temperature sensor at a second wheel end; determining a temperature deviation on the basis of the first sensor temperature and the second sensor temperature; comparing the temperature deviation with a deviation limit value; and outputting a notification when the deviation limit value is exceeded, which notification includes that a temperature change induced by a fault has been detected at least at one of the wheel ends that have a wheel speed sensor having a temperature sensor.