Wheel Speed Pulse Scaling for Tire Size Correction
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Solution Overview
Problem
Existing vehicle speed calculation systems fail to accurately adjust for tire diameter changes, leading to incorrect speed indications and impaired functionality of electronic modules.
Innovation Solution
A wheel speed scaler intercepts and adjusts electronic pulses from sensors based on the ratio of original to replacement tire circumferences, ensuring accurate speed calculations by modifying pulse timing before transmission to the Anti-Lock Brake System.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If larger diameter tires are installed on the vehicle, then the vehicle can achieve better performance and comfort, but the indicated operating speed becomes incorrect and electronic modules malfunction
Solution Approach 1:
The patent changes the pulse timing parameter generated by the speed sensor to match the new tire circumference. By adjusting the pulse interval to correspond to the actual distance traveled per revolution of the larger tires, the system maintains accurate speed indication despite the changed tire dimensions
Solution Approach 2:
The patent introduces an intermediary device between the speed sensor and the ABS module that intercepts and modifies the electronic signals. This intermediary scales the pulse timing information to account for the tire size change, allowing the existing ABS module to function correctly with non-standard tires
2Stability of the object's composition
If the tire circumference value in the Anti-lock Brake Module is not updated, then the module maintains its original configuration, but speed calculation errors occur and electronic functions are impaired
Solution Approach 1:
The patent extracts the tire circumference compensation function from the ABS module itself and places it in a separate intermediary device. This allows the ABS module to maintain its original stable configuration while the intermediary handles the adaptation to different tire sizes, preserving both stability and reliability
3Measurement precision
If emergency braking, traction control, or Anti-lock Brake Systems are disabled due to speed errors, then false safety warnings are avoided, but vehicle safety and control capabilities are reduced
Solution Approach 1:
The patent applies preliminary action by pre-scaling the pulse timing information before it reaches the ABS module and other electronic systems. This preliminary adjustment prevents false speed error conditions that would trigger unnecessary disabling of safety features, ensuring both accurate measurement and continuous operational capability
Data Source
AI summary
A speed scaler adjusts the electronic signals received from the electronic speed sensor on a vehicle to reflect the actual speed of operation of a vehicle after replacement tires are installed on the vehicle. The dimensional parameters of the original tires and the replacement tires for the vehicle are stored in the memory of the speed scaler system and compared to create a ratio for adjustment. The speed scaler is operatively positioned between the electronic speed sensor which creates an electronic pulse corresponding to the rotational speed of each wheel. The speed scaler intercepts these electronic pulses and adjusts the timing of the pulses in accordance with the ratio of the original tire circumference and the replacement tire circumference, and then transmits the adjusted electronic pulse to the Anti-Lock Brake System for re-transmission to the components of the vehicle requiring accurate vehicle speed indications.