Vehicle Motor Angle Correction via Resolver Error Compensation
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Solution Overview
Problem
Existing drive motor control systems for vehicles face inaccuracies in rotation angle detection due to manufacturing variations in resolver sensors, leading to errors in motor control, causing unwanted acceleration or deceleration and discomfort for occupants.
Innovation Solution
A drive motor control apparatus that includes a rotation detecting system capable of outputting reference and actual detected angle information, with error correction mechanisms using time estimation, angle estimation, difference computation, and adjustment to provide accurate motor energization based on corrected angle data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a resolver sensor is used for rotation angle detection, then the system can detect motor rotation angle, but manufacturing variations cause detection errors leading to unstable motor control
Solution Approach 1:
The system uses feedback by continuously monitoring the relationship between actual detected angle information from the resolver and estimated angle information from pulse counting, computing differences and adjusting correction amounts dynamically to compensate for manufacturing variations and maintain accurate rotation angle detection
Solution Approach 2:
The system changes parameters by adjusting the correction amount applied to actual detected angle information based on computed differences between resolver measurements and pulse counter estimates, thereby compensating for manufacturing variations in the resolver sensor
2Measurement precision
If correction amount is increased to improve angle detection accuracy, then detection precision improves, but system complexity increases due to additional computation and adjustment mechanisms
Solution Approach 1:
The system segments the rotation angle detection into two independent sources: actual detected angle information from the resolver sensor and estimated angle information from pulse counter measurements, allowing each to be processed and corrected separately through dedicated computation units
Solution Approach 2:
The system performs preliminary action by pre-computing correction amounts based on the difference between actual and estimated angle information before applying the correction to the final rotation angle output, ensuring accurate detection without real-time computational delays
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system improves the accuracy of motor control by correcting errors in rotation angle detection, ensuring stable vehicle operation and reducing occupant discomfort by maintaining consistent speed and torque.
Implementation Method 1
The resolver outputs a rotation detection signal in accordance with a change of reluctance between the rotor and the stator based on the position of the rotor
Data Source
AI summary
A drive motor control apparatus for a vehicle, wherein the vehicle has a motor and rotation detecting unit. In the apparatus, the first difference computing unit computes one of multiple first differences every time an actual detected angle of rotation of the motor becomes a corresponding representative angle during the one cycle. The first difference indicates an advancing amount of an estimated angle relative to the actual detected angle. The second difference computing unit computes multiple second differences based on the first differences of the one cycle. The second differences are adjusted in accordance with a degree of acceleration and deceleration of the motor. The adjusted second differences are used for correcting the actual detected angle of rotation of the motor.