Rotary Electric Machine Control Device Drive Mode Switching
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Solution Overview
Problem
Conventional rotary electric machine control devices face challenges in maintaining effective motor control when communication abnormalities occur between control circuits, potentially leading to reduced torque output and increased recognition of abnormalities by drivers.
Innovation Solution
The rotary electric machine control device incorporates multiple inverter circuits and control circuits with mode selection units, enabling cooperative, independent, and one-system drive modes. These modes allow for continued motor control and abnormality detection, with the ability to switch to one-system drive mode when communication failures occur, ensuring torque equivalence and driver awareness of abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cooperative drive mode is used with multiple control circuits communicating, then torque output and control reliability are improved, but system complexity and vulnerability to communication abnormalities increase
Solution Approach 1:
The control system is divided into multiple independent control circuits (first control circuit and second control circuit), each capable of independent operation. Each control circuit has its own mode selection unit and drive control unit, allowing the system to segment functionality while maintaining overall cooperation during normal operation.
Solution Approach 2:
The system dynamically switches between different drive modes (cooperative drive mode, independent drive mode, one-system drive mode) based on communication status. The mode selection unit monitors communication abnormalities and automatically transitions the system to appropriate modes, making the system adaptable to different operational conditions.
2Reliability
If independent drive mode is used during communication abnormalities, then torque output is maintained, but driver awareness of abnormalities is reduced
Solution Approach 1:
The system provides dynamic torque characteristics that change based on the selected drive mode. In independent drive mode during communication abnormalities, the torque output characteristics are modified to create a noticeable difference from normal operation, allowing drivers to perceive the abnormal state while maintaining sufficient torque for safe operation.
3Object-generated harmful factors
If one-system drive mode is used to improve abnormality detection, then driver awareness increases, but control reliability may be reduced
Solution Approach 1:
The system dynamically adjusts torque output characteristics based on the selected drive mode. In one-system drive mode, the active control circuit modifies torque characteristics to be noticeably different from normal operation, enhancing driver awareness of abnormalities while maintaining sufficient control reliability for safe vehicle operation.
4Adaptability or versatility
If multiple drive modes are provided for different scenarios, then adaptability to various conditions is improved, but device complexity increases
Solution Approach 1:
Each control circuit is designed with universal functionality to operate in multiple drive modes (cooperative, independent, and one-system drive modes). The mode selection unit and drive control unit in each control circuit can perform different functions depending on the selected mode, reducing the need for separate dedicated circuits for each mode and thereby managing complexity while maintaining versatility.
Data Source
AI summary
Control circuits control inverter circuits provided in correspondence to the control circuits by a drive mode selected from a plurality of drive modes. A cooperative drive mode is for controlling a current supply to motor windings by a plurality of systems by using a value acquired from the other control circuit via communication. An independent drive mode is for controlling the current supply to the motor windings by the plurality of systems without using the value acquired from the other control circuit. A one-system drive mode is for controlling the current supply to the motor winding by one system without using the value acquired from the other control circuit. The control circuits set the drive mode to a cooperative drive mode when inter-computer communication is normal. The control circuits set the drive mode to an independent drive mode or a one-system drive mode thereby differentiating an output characteristic of a motor from that in the cooperative drive mode.