Tire Anomaly Detection for Traction Control Accuracy
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Solution Overview
Problem
Performance-enhancing systems in passenger vehicles, such as traction control and anti-skid systems, are impaired by anomalies in tire sizes and inflation levels, leading to false or premature activation due to differences in wheel speeds caused by mini-spare, underinflated, or overinflated tires.
Innovation Solution
A method that senses steering angle and wheel rotational speeds, calculates expected wheel speeds, determines tire diameters, and adjusts system settings to compensate for anomalies, preventing false activations by detecting and compensating for undersized, oversized, or under/overinflated tires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a mini-spare or nonstandard tire is used, then space and weight restrictions are satisfied, but wheel speed differences cause false activation of performance enhancing systems
Solution Approach 1:
The system performs preliminary detection of tire anomalies by monitoring wheel speed differences before they cause false activation of performance enhancing systems. The microprocessor continuously compares actual wheel speeds with expected speeds calculated from vehicle speed and steering angle, enabling early identification of mini-spares or nonstandard tires.
Solution Approach 2:
The system uses feedback from wheel speed sensors to continuously monitor and detect tire anomalies. The microprocessor receives feedback on actual wheel speeds, compares them with expected speeds, and uses this information to identify when a mini-spare or nonstandard tire is present, preventing false system activation.
2Measurement precision
If wheel speed differences are used as control parameters, then traction control and anti-skid systems can detect slip, but tire anomalies cause false interpretation of wheel speed differences
Solution Approach 1:
The system introduces an intermediary detection layer that monitors wheel speed differences before they are interpreted by the performance enhancing systems. The microprocessor acts as an intermediary that filters out anomalies caused by mini-spares or nonstandard tires, preventing them from being misinterpreted as slip conditions by the traction control or anti-skid systems.
Solution Approach 2:
The system applies preliminary anti-action by detecting and flagging tire anomalies before they can cause false activation of performance enhancing systems. By identifying wheel speed differences caused by mini-spares or nonstandard tires in advance, the system prevents the harmful effect of false slip detection and premature system activation.
3Ease of operation
If standard tire monitoring is implemented, then normal operation is maintained, but detection of nonstandard tires requires additional calculation steps
Solution Approach 1:
The microprocessor performs multiple functions using the same sensor data: it calculates expected wheel speeds for normal operation and simultaneously detects tire anomalies by comparing actual speeds with expected speeds. This multi-functionality allows the system to maintain normal operation while also detecting mini-spares or nonstandard tires without requiring separate hardware.
Solution Approach 2:
The system uses its existing wheel speed sensors and microprocessor to self-diagnose tire anomalies. By utilizing the same sensors that provide data for normal traction control and anti-skid operation, the system performs self-monitoring and detection of nonstandard tires without requiring additional sensors or external monitoring equipment.
Data Source
AI summary
A method of detecting the presence of an undersized, e.g., mini-spare, or an underinflated, oversized or overinflated tire or tires on a passenger motor vehicle improves operation of traction control, stability and anti-lock brake systems by compensating for such operating anomalies. The method includes the steps of sensing the steering angle, sensing the actual rotational speeds of each wheel, determining the actual vehicle speed, calculating each expected wheel speed based upon the sensed steering angle and wheel speeds, calculating each tire diameter based upon the calculated wheel speeds and, finally, determining whether such diameters are within various defined ranges which permit normal operation, permit reduced function operation, or require system shut down.