Rotating Electric Machine Control System Multiplex Communication
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Solution Overview
Problem
The existing rotating electric machine control systems for vehicles face challenges in reducing the number of communication lines between the power control unit and the control section, leading to increased manufacturing costs and potential deterioration in controllability due to communication delays.
Innovation Solution
The system employs a multiplex communication line using a communicator to transmit combined detection values from current and voltage detectors, while a trigger communication line ensures time synchronization with the rotation detector, reducing the overall number of communication lines and maintaining controllability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate communication lines are used to transmit detection values from current detector, voltage detector, and rotation detector to the control section, then the controllability and response time are improved, but the number of communication lines increases dramatically, leading to increased manufacturing cost and installation difficulty
Solution Approach 1:
The patent combines multiple separate communication lines into a single multiplex communication line. The current detector, voltage detector, and rotation detector all transmit their detection values through one shared communication line to the control section, thereby reducing the number of communication lines while maintaining the ability to transmit all necessary data for controlling the voltage converter.
Solution Approach 2:
The multiplex communication line serves multiple functions by transmitting different types of detection values (current, voltage, and rotation position) from different detectors to the control section through a single line. This universal communication infrastructure replaces multiple dedicated communication lines, reducing complexity while preserving full controllability.
2Device complexity
If a multiplex communication line is used to reduce the number of communication lines, then the manufacturing cost and installation complexity are reduced, but communication delays occur that deteriorate the controllability of the voltage converter
Solution Approach 1:
The control section transmits a trigger signal to the power control unit before needing the detection values. This preliminary action allows the power control unit to prepare and transmit the detection data through the multiplex communication line at the appropriate time, minimizing communication delays and ensuring timely data availability for voltage converter control.
Solution Approach 2:
The system implements a feedback mechanism where the control section sends trigger signals to request specific detection values, and the power control unit responds by transmitting the current, voltage, and rotation detection values through the multiplex communication line. This feedback loop ensures that data is transmitted on-demand, reducing unnecessary communication delays while maintaining efficient controllability.
3Adaptability or versatility
If the power control unit and control section are provided as separate components, then the functionality distribution and manufacturing flexibility are improved, but the number of communication lines connecting them increases dramatically
Solution Approach 1:
The patent merges multiple communication functions into a single multiplex communication line that connects the separately provided power control unit and control section. This allows the system to maintain the benefits of functional distribution and manufacturing flexibility while reducing the number of physical communication lines to just one, thereby lowering installation complexity and cost.
Data Source
AI summary
A rotating electric machine control system has a power control unit (PCU) and a control section separately disposed therein. The apparatus receives a trigger signal from a communicator of the PCU via a trigger communication line from an MG ECU when the MG ECU obtains electric angles from a rotation sensor. The communicator, upon receiving an input of the trigger signal, generates a communication frame that includes plural detection values from a current sensor and a voltage sensor. Then, the communicator outputs the communication frame to the MG ECU via a multiplex communication line. The MG ECU performs a preset process for a control of an inverter and a booster converter based on the detected electric angles and the communication frame matching with those electric angles.