Wheel Speed Sensor Decoding With Pulse-Width Brake Control
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Solution Overview
Problem
Inaccurate or delayed decoding of wheel speed sensor data can lead to improper brake actuation, reducing braking performance and compromising vehicle control, particularly in advanced systems like Anti-lock Braking Systems (ABS) and Electronic Stability Control (ESC).
Innovation Solution
A decoder circuit determines the current sensor protocol by analyzing the frequency of speed pulses and specific data bits, transforming the input signal into output signals with defined pulse widths to accurately identify wheel acceleration or deceleration, and controls brake application based on this status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional wheel speed sensor decoding methods are used, then the system can operate with existing hardware, but the braking performance is reduced due to inaccurate or delayed decoding
Solution Approach 1:
The patent changes the temporal parameter of the output signal by setting different pulse widths (e.g., 250 microseconds for standard protocol, 350 microseconds for interpolated protocol, 450 microseconds for standstill protocol) based on the determined sensor protocol type. This parameter change enables the controller to accurately identify wheel acceleration or deceleration status and improves braking performance without requiring additional hardware.
2Measurement precision
If the decoder circuit sets pulse width based on determined sensor protocol, then wheel operational status is accurately identified, but the device complexity increases
Solution Approach 1:
The patent introduces an intermediary pulse width setting mechanism in the decoder circuit that translates different sensor protocols into distinct pulse width outputs. This intermediary layer allows the controller to easily identify wheel operational status without directly processing complex sensor protocols, thereby improving measurement precision while managing device complexity through a straightforward transformation approach.
3Measurement precision
If additional hardware and processing resources are allocated, then decoding accuracy improves, but the cost and system complexity increase
Solution Approach 1:
The patent achieves improved decoding accuracy by changing the temporal parameter (pulse width) of the existing output signal based on the determined sensor protocol, rather than adding additional hardware or processing resources. This approach maintains cost-effectiveness and system simplicity while delivering accurate wheel operational status identification.
Data Source
AI summary
A computerized method of controlling a brake assembly applied to a wheel includes receiving, by a decoder circuit, an input signal from a sensor. The input signal indicates rotational speed of a wheel of a vehicle. The method also includes determining, by the decoder circuit, which sensor protocol from a set of sensor protocols is currently being used. The method further includes transforming, by the decoder circuit, the input signal to generate an output signal. The decoder circuit sets a pulse width of the output signal based on the determined sensor protocol. The method also includes transmitting, by the decoder circuit, the output signal to a controller. The method additionally includes determining, by the controller, an operational status of the wheel based on the output signal. The method also includes controlling, by the controller, application of the brake assembly to the wheel based on the operational status.