Resolver Offset Correction for Hybrid Vehicle Motor Stability
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Solution Overview
Problem
Hybrid vehicles experience persistent offset errors in resolver position due to noise, leading to potential motor damage during engine clutch release or gear shifts, as existing correction methods fail to accurately account for speed divergence.
Innovation Solution
An apparatus and method that detect resolver offset correction errors in real-time by determining engine clutch release and motor torque commands, calculate motor speed change values, and use a resolver offset change value table to correct the offset, preventing speed divergence by adjusting the resolver offset correction value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resolver offset correction is performed once, then initial offset is reduced, but residual offset errors persist due to noise causing motor speed divergence
Solution Approach 1:
The patent implements a feedback mechanism by continuously monitoring motor speed changes and detecting resolver offset correction errors in real-time. When an error is detected (motor speed change exceeds threshold), the system automatically recalculates and updates the resolver offset correction value, creating a closed-loop control system that maintains accurate position detection throughout operation.
Solution Approach 2:
The patent performs preliminary offset correction before motor operation begins, and prepares additional correction values in advance based on pre-stored tables. This preliminary action ensures that correction values are ready before needed, allowing rapid response when offset errors are detected during operation.
2Reliability
If real-time offset correction is implemented, then motor speed divergence is prevented, but system complexity increases
Solution Approach 1:
The system performs self-diagnosis by automatically detecting resolver offset correction errors through monitoring motor speed changes. When an error is detected, the system self-corrects by recalculating the offset value using pre-stored tables, eliminating the need for external intervention or complex additional hardware.
Solution Approach 2:
The patent pre-stores multiple resolver offset change values in a table before operation begins. These values are calculated in advance based on different motor speed change scenarios. During operation, the system simply looks up the appropriate correction value from the pre-stored table, avoiding complex real-time calculations and reducing system complexity.
3Measurement precision
If multiple correction values are stored, then correction accuracy is improved, but memory requirements increase
Solution Approach 1:
The patent stores resolver offset change values in a segmented table structure, where different correction values are stored for different motor speed change ranges. This local quality approach allows the system to store only the necessary correction values for specific operating conditions rather than all possible scenarios, optimizing memory usage while maintaining correction precision.
Data Source
AI summary
The present disclosure relates to an apparatus for correcting an offset of a resolver of an environment-friendly vehicle. The apparatus includes a resolver offset correcting error determining unit configured to determine whether a resolver offset correction error occurs, by determining whether an engine clutch is released and a torque command of a motor. The apparatus further includes a motor speed change value calculating unit configured to calculate a change value of a speed of the motor when it is determined that the resolver offset correction error occurs and a controller configured to extract a resolver offset change value by using a resolve offset change value table for the change value of the speed of the motor.