Wheel Speed Sensor Protocol for High-Resolution Data Without Truncation
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Solution Overview
Problem
Existing wheel speed sensor systems face challenges in maintaining data integrity and resolution, particularly with the adoption of advanced driver-assistance systems (ADAS) and autonomous driving standards, which lead to data truncation and reduced system safety.
Innovation Solution
The proposed solution involves enhancing the digital circuits used in wheel speed sensors to increase data resolution and prevent truncation. This is achieved by combining pulse signals with data bits in subsequent cycles, spreading data across multiple messages, and using additional current levels to encode more information per unit of time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the wheel speed sensor generates a higher number of output pulses to achieve higher data resolution, then the data frequency increases, but data bits are truncated and information is lost
Solution Approach 1:
The patent segments the data transmission by separating speed pulse information from data bits, allowing the ECU to reconstruct complete data messages even when data bits are truncated. The speed pulses provide timing information that enables the ECU to assemble the full data set from partial transmissions.
Solution Approach 2:
The patent adds a temporal dimension to data transmission by spreading data bits across multiple transmission cycles. Instead of requiring all data bits to be transmitted in a single continuous message, the system transmits data bits intermittently over time, using speed pulses as synchronization markers to reconstruct the complete data set.
2Loss of information
If more data bits are transmitted per unit time to increase information content, then data frequency increases, but the risk of data truncation and loss increases
Solution Approach 1:
The patent implements a feedback mechanism where the ECU uses received speed pulses to monitor transmission timing and detect potential truncation events. Based on this feedback, the ECU can request retransmission or reconstruct missing data, thereby maintaining data integrity even when transmission conditions are suboptimal.
3Measurement precision
If additional current levels are used to encode more information per unit of time, then data resolution increases, but power consumption increases
Solution Approach 1:
The patent merges speed pulse generation with data transmission by encoding data bits within the speed pulse train itself. Rather than using separate high-current channels for data transmission, the system modulates data information within the existing speed pulse signal, thereby increasing information density without proportionally increasing power consumption.
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
The enhanced solution effectively increases the informational data on sensor outputs, reduces power consumption, and improves fault detection time, thereby enhancing system safety and data integrity in high-resolution wheel speed monitoring applications.
Implementation Method 1
a sensing element for repeatedly sensing a signed magnitude of an electromagnetic property of a target
Data Source
AI summary
Electronic circuits and methods sense an electromagnetic property of a target, and transmit data packets that encode the property along with diagnostic messages while avoiding data loss due to truncation at high sensing speeds. Data address bits may be used to split messages across multiple data packets. Data bits may be combined into a unified header that takes less time to transmit than in prior communication protocols. The transmission duration of each data bit may be lowered, thereby increasing throughput. The receiving system may synchronize its own operation against these shortened data bits, increasing its speed. Error packets may be sent between data packets, thereby reducing time to respond to faults in safety-critical systems. And additional current levels may be used to increase the data information rate.