Motor Controller Torque Calculation for Ramp Parking Stability
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Solution Overview
Problem
Existing motor controllers for electric and hybrid vehicles fail to accurately learn current dynamic conditions, leading to instability in assist control functions, particularly during ramp parking, and require additional detection elements, increasing costs.
Innovation Solution
A motor controller system that generates an assist torque command using a rotor position signal and rotor speed signal, incorporating a first consolidation unit, gain units, and a threshold limiting unit to perform calculations for accurate torque control, preventing sliding during parking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional detection elements or high-order detection elements are used for assist determination, then measurement precision of vehicle dynamic conditions is improved, but device complexity and cost increase
Solution Approach 1:
The motor controller utilizes its existing rotor position sensor and rotor speed sensor to simultaneously serve both motor control functions and vehicle assist determination functions. The controller learns vehicle dynamic conditions by analyzing data from these existing sensors through consolidation units, eliminating the need for additional detection elements while maintaining measurement precision.
Solution Approach 2:
The existing rotor position sensor and rotor speed sensor are made multi-functional by using their output signals for both traditional motor control purposes and new vehicle assist determination purposes. The first consolidation unit and second consolidation unit process these signals to determine vehicle assist conditions, allowing one detection system to serve multiple functions without adding hardware.
2Device complexity
If current dynamic conditions of the vehicle are not accurately learned, then device complexity is reduced, but reliability of assist control deteriorates
Solution Approach 1:
The system implements feedback mechanisms where the rotor position feedback and rotor speed feedback from the motor device are continuously monitored and fed into consolidation units. These units compare expected vehicle conditions with actual conditions derived from sensor data, enabling accurate learning of dynamic conditions and reliable assist control decisions without increasing system complexity.
Solution Approach 2:
The first consolidation unit and second consolidation unit perform preliminary analysis of rotor position and speed signals to determine vehicle assist conditions before actual assist control is applied. This preliminary learning phase allows the system to accurately assess dynamic conditions and prepare appropriate assist responses, ensuring reliability while maintaining simple device architecture.
Data Source
AI summary
The present application discloses a motor controller, a motor control method and a computer program product for vehicle assist control. An assist torque command for a motor device to perform vehicle assist control is generated according to an execution command of a vehicle assist determination unit and a rotor position signal and a rotor speed signal of a motor device. An original position signal of the motor device and the rotor position signal are calculated, and a position ratio calculation is performed to generate a front-order torque command. A torque damping command is generated according to the speed ratio calculation based on the rotor speed signal, and is calculated with the front-order torque command to generate an assist torque command. Thus, position information of the rotor of the motor device can be directly used in the calculation and speed information is at the same time used for an assist calculation, thereby preventing an error and solving the issue of sliding during parking.