AK Wheel Speed Sensor Bit Parsing Without Special Chips
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Solution Overview
Problem
The high cost of special peripheral chips used for parsing AK protocol data signals in wheel speed sensors poses a challenge, affecting the competitiveness and supply chain safety of enterprises.
Innovation Solution
A protocol data bit parsing method and device that converts current signals from wheel speed sensors into voltage signals, captures timestamps of rising and falling edges, and parses protocol data bits without requiring special chips, using an AK signal separation circuit and edge capture modules to extract speed and data pulses under various conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If special peripheral chips are used to parse AK protocol data signals, then parsing accuracy and reliability are improved, but product cost increases
Solution Approach 1:
The patent replaces expensive special peripheral chips with a cost-effective software-based parsing implementation in the ECU. The AK protocol data signal parsing is achieved through software algorithms that process the signals using general-purpose processors, eliminating the need for costly dedicated hardware chips while maintaining parsing functionality.
Solution Approach 2:
The patent substitutes the hardware-based special peripheral chip with a software-based processing system. The parsing function previously performed by dedicated hardware is now implemented through software algorithms running on general-purpose ECUs, replacing the mechanical/hardware system with a software-based approach.
2Difficulty of detecting and measuring
If special peripheral chips are used for signal parsing, then signal processing capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the signal parsing function with the general-purpose ECU system. Instead of having a separate special peripheral chip, the parsing functionality is integrated into the existing ECU software architecture, combining multiple functions (signal processing, data parsing, control logic) into a unified software-based system.
Solution Approach 2:
The patent makes the general-purpose ECU perform multiple functions including AK protocol data signal parsing, wheel speed monitoring, and other vehicle control functions. The software-based parsing implementation allows the same hardware platform to handle diverse signal processing tasks without requiring specialized dedicated chips.
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
This approach reduces product costs, improves competitiveness, and ensures supply chain safety by eliminating the need for special chips while accurately parsing protocol data bits, enabling the acquisition of field amplitude, mode status, direction information, and check information from wheel speed sensors.
Implementation Method 1
The AK signal separation circuit can be realized by a comparator, and exemplarily, can complete the conversion of the current signal and the voltage signals through a certain I/V conversion circuit
Data Source
AI summary
A protocol data bit parsing method and device for an AK protocol wheel speed sensor. The method includes receiving a current signal sent by an AK protocol wheel speed sensor and converting the current signal into a first voltage signal and a second voltage signal; capturing the time of rising edges and falling edges of the first voltage signal and the second voltage signal and saving a first timestamp set and a second timestamp set; acquiring a complete set of timestamps of protocol data bits according to the first timestamp set and the second timestamp set and denoting as protocol data timestamps; and parsing the protocol data bits according to the protocol data timestamps to obtain values of the protocol data bits. The method can reduce the product cost and ensure the safety of the supply chain, which improves the competitiveness of enterprises.