Rotary Electric Device Control Device for EPS Arbitration
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Solution Overview
Problem
In electric power steering systems, inconsistencies in assist control calculations between microcomputers can lead to system inconsistencies and increased complexity, particularly when independent current control is performed in each system.
Innovation Solution
A rotary electric device control device that coordinates multiple systems by generating control signals using common host system and other system detection values, such as current detection values, to ensure cooperative operation and reduce inconsistencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two microcomputers independently calculate assist control amounts, then each system can operate autonomously, but system inconsistencies and arbitration complexity increase
Solution Approach 1:
The patent merges the independent operation of multiple microcomputers by having them share common detection values (current, voltage, temperature) and coordinate their control signals. This allows each system to maintain autonomy while reducing arbitration complexity through unified data sources and coordinated control strategies.
Solution Approach 2:
The patent implements a universal detection value sharing mechanism where detection values are made common across multiple systems. This multi-functional approach allows the same detection data to be used by multiple microcomputers, reducing redundancy and arbitration complexity while maintaining system autonomy.
2Ease of operation
If independent current control is performed in each system, then each microcomputer can control its own motor, but inconsistencies in assist control calculations occur
Solution Approach 1:
The patent changes the control parameters by using shared detection values (current, voltage, temperature) across multiple systems. This ensures that while each microcomputer independently controls its motor, they all base their control calculations on the same operational parameters, maintaining control consistency.
Solution Approach 2:
The patent implements a feedback mechanism where detection values from each system are shared and used by all microcomputers. This cross-system feedback ensures that independent control actions are coordinated based on real-time operational status, preventing inconsistencies in assist control calculations.
3Reliability
If multiple systems operate independently, then system redundancy is improved, but heat generation becomes uneven across systems
Solution Approach 1:
The patent applies equipotentiality by ensuring all systems operate from the same detection values and control calculations. This creates equal operational conditions for each system, resulting in uniform heat generation across all microcomputers and motor drivers, while maintaining system redundancy.
4Adaptability or versatility
If each system uses its own detection values, then system independence is maintained, but cooperative operation becomes difficult
Solution Approach 1:
The patent merges detection value usage across independent systems. Each microcomputer maintains its independence but uses the same shared detection values, enabling cooperative operation without increasing coordination complexity. This approach allows systems to work together seamlessly while preserving individual system independence.
Data Source
AI summary
A rotary electric device control device for controlling driving of a rotary electric device including a plurality of winding sets, includes: a plurality of drive circuits; and a plurality of control units that include signal output units for outputting control signals to the drive circuits corresponding to the control units, respectively. The one of the control units generates a control signal according to a command value calculated by each system, a host system detection value relating to a detection value of a host system, and another system detection value relating to another detection value of another system. An electric power steering device includes: the rotary electric device control device; the rotary electric device that outputs an assist torque for assisting a steering operation of a steering wheel by a driver; and a power transmission unit that transmits a driving force of the rotary electric device to a drive target.