Wheel Speed Sensor Interface Time Division Multiplexing
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Solution Overview
Problem
Existing electronic control systems for vehicles face challenges in miniaturization and reliability, particularly in processing wheel speed sensor signals, which are critical for safety but require more efficient and compact solutions.
Innovation Solution
A wheel speed sensor interface with a speed pulse detection circuit and a comparison speed detection circuit that uses time division multiplexing to transmit counting values, reducing the number of hardware pins needed for error detection and enabling efficient error checking and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional wheel speed sensor interfaces use separate channels for transmitting speed information and error detection data, then reliability is improved through comprehensive error checking, but device complexity and size increase
Solution Approach 1:
The patent combines the transmission of speed information and error detection data into a single channel using time division multiplexing. The comparison speed detection circuit generates error detection data by comparing counting values from multiple counters, then multiplexes this data with speed information for transmission through one shared channel, reducing the number of required hardware pins while maintaining error detection capability
Solution Approach 2:
The system uses periodic time division multiplexing to alternately transmit speed information and error detection data through the same channel. During specific time periods, counting values are compared and error detection data is generated and transmitted, while at other times normal speed information flows, creating a periodic transmission pattern that shares the channel efficiently
2Volume of moving object
If miniaturization of electronic control system components is implemented, then device size is reduced, but reliability of sensor signal processing may deteriorate
Solution Approach 1:
By merging multiple transmission channels into one through time division multiplexing, the physical size of the interface circuit is reduced while the reliability is maintained through the comparison speed detection circuit that continuously monitors for errors in the multiplexed signal transmission
Solution Approach 2:
The comparison speed detection circuit provides feedback by comparing counting values from multiple counters and generating error detection data. This feedback mechanism ensures that even in a miniaturized interface, reliability is maintained by detecting and reporting errors in the compressed signal path
Data Source
AI summary
Provided is a wheel speed sensor interface. The wheel speed sensor interface includes: a speed pulse detection circuit configured to receive a plurality of sensor signals including wheel speed information of a vehicle, detect a plurality of speed pulses on the basis of the plurality of the received sensor signals, and transmit the plurality of the detected speed pulses to an external device; and a comparison speed detection circuit configured to generate a plurality of counting values by counting each of the detected speed pulses, generate comparison speed information by multiplexing the plurality of the generated counting values through a time division method, and transmit the generated comparison speed information to the external device.