Electric Drive Monitoring via Pilot-Control Error Detection
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Solution Overview
Problem
Existing methods for monitoring and diagnosing electrical drive machines in vehicles are inefficient and unreliable, leading to potential performance impairments.
Innovation Solution
A control arrangement with pilot and closed-loop control, using a model with pre-determined parameters, identifies pilot-control errors through controller portions, and initiates a set of tests including HFSI, flux, and sensor tests to update model parameters and rectify errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing monitoring methods are used, then the system structure remains simple, but the monitoring efficiency and reliability deteriorate
Solution Approach 1:
The patent implements a feedback mechanism where the controller continuously monitors the controller portion and compares it against threshold values. When the controller portion exceeds the threshold, the system triggers a diagnostic mode that injects test signals and measures responses to detect pilot control errors. This closed-loop feedback ensures reliable monitoring while maintaining relatively simple system architecture by reusing existing controller components.
Solution Approach 2:
The system performs self-diagnosis by automatically detecting pilot control errors through monitoring the controller portion, triggering diagnostic tests, and identifying issues without external intervention. The control arrangement monitors itself during normal operation and can autonomously initiate diagnostic sequences, reducing the need for complex external monitoring equipment while maintaining high reliability.
2Measurement precision
If comprehensive monitoring is implemented, then monitoring precision improves, but the complexity of detection and measurement increases
Solution Approach 1:
The patent extracts the essential monitoring function by focusing specifically on detecting pilot control errors through the controller portion, rather than attempting to monitor all possible parameters. By isolating and monitoring only the critical controller portion signal against a threshold, the system achieves high detection precision for pilot control errors while avoiding the complexity of comprehensive multi-parameter monitoring.
Solution Approach 2:
The system performs preliminary detection during normal operation by continuously monitoring the controller portion and comparing it to a predetermined threshold. This preliminary action allows the system to identify potential pilot control errors before they cause significant performance degradation, enabling early intervention while maintaining simple detection mechanisms.
3Reliability
If continuous monitoring is performed, then monitoring reliability improves, but energy consumption increases
Solution Approach 1:
The patent implements periodic monitoring where the controller continuously checks the controller portion during normal operation, but only triggers full diagnostic tests when the controller portion exceeds the threshold value. This periodic action pattern maintains high reliability by continuously monitoring the critical parameter while consuming minimal energy by activating intensive diagnostic modes only when necessary, rather than running continuous comprehensive tests.
Data Source
AI summary
A device for monitoring an electric drive of a motor vehicle, wherein the drive comprises an electric drive machine and a control system for controlling the drive machine, and the control system comprises a pilot controller and a controller. The device is configured to determine, on the basis of a control component for controlling the drive machine determined by the control system, that there is a pilot control error situation related to the control of the drive machine. The device is further configured to take, in response to the identified pilot control error situation, at least one measure relating to the identified pilot control error situation.