Wheel Ground-Contact State Judging Device
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Solution Overview
Problem
Existing methods for judging the ground-contact state of vehicle wheels are indirect and lack precision, making it difficult to accurately assess the safety of vehicle motion during turns.
Innovation Solution
A device comprising a detector for directly measuring lateral and vertical forces acting on wheels, an acceleration sensor for calculating cornering forces, and a judging unit for comparing these forces to determine the ground-contact state, allowing for precise judgment of wheel conditions and enhanced vehicle safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the ground-contact state is estimated on the basis of roll angle or roll angular velocity, then the device complexity is reduced, but the measurement precision deteriorates
Solution Approach 1:
The patent replaces indirect mechanical estimation methods (roll angle sensors) with direct force detection methods. By installing force detectors on the wheel hub that directly measure lateral forces acting on the wheels, the system substitutes mechanical inference with direct physical measurement, thereby achieving both acceptable device complexity and high measurement precision.
Solution Approach 2:
The patent introduces cornering force as an intermediary parameter to bridge the relationship between wheel behavior and ground-contact state. The cornering force calculator computes the expected lateral force based on vehicle dynamics parameters, which then serves as a reference to evaluate the actual ground-contact condition through comparison with detector readings.
2Ease of manufacture
If indirect estimation methods are used, then the ease of manufacture is improved, but the reliability deteriorates
Solution Approach 1:
The patent replaces unreliable indirect estimation with reliable direct measurement by installing force detectors that directly sense lateral forces on the wheel hub. This substitution maintains ease of manufacture through standardized sensor integration while dramatically improving reliability through direct physical measurement of the contact state.
Solution Approach 2:
The patent implements a feedback mechanism where the actual lateral force detected by the sensor is continuously compared with the calculated cornering force. This feedback loop provides reliable real-time assessment of ground-contact state, allowing the system to detect deviations that indicate poor contact conditions with high reliability.
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 precise judgment of wheel ground-contact states, improving vehicle safety by directly detecting forces and adjusting roll rigidity, thereby maintaining better contact and stability during turns.
Implementation Method 1
an acceleration sensor for detecting an acceleration in the lateral direction of a vehicle, a calculator for calculating a cornering force acting on the wheel on the basis of the acceleration in the lateral direction detected by the acceleration sensor
Data Source
AI summary
In wheel ground-contact state judging device and method, a detector directly detects a lateral force acting in a direction perpendicular to the wheel center plane of a wheel. An acceleration sensor detects an acceleration in the lateral direction of a vehicle. A calculator calculates a cornering force acting on each wheel on the basis of the acceleration in the lateral direction thus detected. A judging unit compares the detected lateral force with the calculated cornering force to judge whether the ground-contact state of the wheel is good or not.