Vehicle Notification Apparatus Wheel Speed Variation Diagnosis
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Solution Overview
Problem
Existing vehicle notification apparatuses incorrectly determine or fail to specify the factor causing variations in wheel rotational speed, leading to potential misdiagnosis of disc rotor wear or other issues.
Innovation Solution
A vehicle notification apparatus comprising a brake device, wheel rotational speed sensor, and control unit that determines specific variations in wheel rotational speed and identifies the cause by correlating rotational angle positions with stored factors, such as wear, thickness unevenness, and rust, allowing accurate notification to the user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional apparatuses determine wear based on wheel rotational speed variation, then wear detection capability is provided, but misdiagnosis occurs because other factors also cause speed variation
Solution Approach 1:
The invention segments the wear detection process into two independent stages: first detecting wheel speed variation, then separately identifying the cause through rotational angle position analysis. This segmentation allows differentiation between wear-induced variations and variations from other sources, resolving the misdiagnosis problem while maintaining detection capability.
Solution Approach 2:
The rotational angle position serves as an intermediary parameter that links wheel speed variation to its cause. By introducing this intermediate measurement, the system can distinguish whether speed variation originates from wear (specific angle positions) or other factors (different angle positions), thereby improving diagnosis reliability without sacrificing detection sensitivity.
2Measurement precision
If multiple factors are considered for wheel speed variation, then diagnosis accuracy improves, but system complexity increases
Solution Approach 1:
The invention extracts the rotational angle position information from the wheel speed signal and uses it as a separate key for identifying the cause. This extraction approach allows the system to handle multiple potential factors (wear, imbalance, rust, etc.) without increasing hardware complexity, as the same sensor data is analyzed through an additional dimensional lens.
Solution Approach 2:
The system changes the analysis parameter from solely speed magnitude to include rotational angle position. This parameter transformation enables the identification of multiple factors affecting wheel speed without adding physical components, as different factors produce characteristic patterns in the angle-position domain.
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 correct specification and notification of the factor causing wheel rotational speed variations, reducing misdiagnosis and improving maintenance efficiency without increasing the cost of the brake device or vehicle.
Implementation Method 1
a wheel rotational speed sensor configured to generate a detection signal every time the wheel rotates by a predetermined angle
Data Source
AI summary
The vehicle notification apparatus comprises: a brake device configured to press a frictional member against a rotating member; a wheel rotational speed sensor configured to generate a detection signal every time the wheel rotates by a predetermined angle; a notification execution device; and a control unit configured to obtain a wheel rotational speed based on the detection signal. The control unit is configured to: determine that a specific variation in the wheel rotational speed has occurred when the wheel rotational speed is determined to satisfy a predetermined specific variation occurrence condition; obtain, as a specific variation rotational angle position, a rotational position of when the specific variation has occurred based on the detection signal; specify a factor that has actually caused the specific variation based on the specific variation rotational angle position; and let the notification execution device provide information regarding the specified factor.