Electric Power Steering Interlock Apparatus Cost Reduction
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Solution Overview
Problem
Conventional interlock apparatuses for electric power steering systems require high-performance processors to process precise motor position signals, leading to increased manufacturing costs due to the need for complex calculations and signal processing.
Innovation Solution
An interlock apparatus that calculates the output torque current value using only two-phase current values and a rectifying positional value for one-phase feedback current, allowing for the use of a lower-performance processor and reducing manufacturing costs by simplifying the processing requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional interlock apparatus uses high-performance processor to process precise motor position signals, then measurement precision and reliability are improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent extracts and eliminates the need for high-performance processors by removing the complex calculation and signal processing requirements. The interlock apparatus is redesigned to function with simpler processors by avoiding Clark transformation, Park transformation, and complex motor position signal processing, thereby reducing manufacturing costs while maintaining essential interlock functionality.
Solution Approach 2:
The patent changes the computational parameters and processing requirements of the interlock apparatus. Instead of requiring high-performance processors for complex transformations, the system is redesigned to operate with standard processors by simplifying the mathematical operations and signal processing steps, thus reducing device complexity and manufacturing cost.
2Manufacturing precision
If conventional interlock apparatus performs complex Clark transformation and Park transformation, then output torque calculation accuracy is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent removes the complex Clark transformation and Park transformation steps from the interlock apparatus. By extracting these computationally intensive operations, the system can achieve sufficient output torque calculation accuracy using simpler methods and standard processors, thereby reducing device complexity and manufacturing costs.
Solution Approach 2:
The patent replaces expensive high-performance processors with cheaper standard processors. The interlock apparatus is redesigned to use readily available, cost-effective processors that can handle the simplified calculations, making the system more economically viable without significantly compromising functionality.
Data Source
AI summary
An apparatus for implementing interlock of an electric power steering system is disclosed. The interlock apparatus can generate the output torque current value for achieving the steering system interlock with current values of two phases and the rectifying positional value for the 1-bit feedback current of one phase out of the 3-phase feedback current values and the rectifying positional value for the 3-bit 3-phase feedback current values. The disclosed interlock apparatus receives the 3-phase feedback current values from the current sensor and the rectifying positional values for the 3-bit 3-phase feedback current values from the rectifying positional sensor, and retrieves therefrom the current values of two phases and the rectifying positional value for the 1-bit feedback current of one phase for use with a substantially cost effective processor in generating the output torque current value.