Hybrid Motor Torque Smoothing via Adaptive Step Control
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Solution Overview
Problem
Current motor torque smoothing methods in hybrid power systems result in unsmooth torque variation and long response times, affecting vehicle acceleration and overall performance.
Innovation Solution
A hybrid power system with a Hybrid Control Unit, Motor Control Unit, and communication through a CAN bus, which determines the current and demanded operation modes of the motor, calculates a time parameter for smoothing torque, and adjusts the actual output torque using an incremental step equation to achieve stable and timely torque response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a torque variation step is set by a motor control system to simply control the slope of a torque variation curve, then the torque variation becomes continuous, but the torque curve remains unsmooth and response time becomes long
Solution Approach 1:
The patent applies dynamics by making the torque variation process adaptive and flexible. Instead of using a fixed torque variation step, the system dynamically adjusts the torque increment based on the current operating state and demanded torque. The motor control system continuously calculates the optimal torque variation step considering factors like current torque, demanded torque, and operating conditions, thereby achieving both continuity and smoothness in the torque curve while maintaining responsive acceleration.
2Stability of the object's composition
If a torque variation step is set to control the slope of torque variation, then the torque curve becomes continuous, but acceleration response time becomes long
Solution Approach 1:
The system dynamically adjusts the torque variation step based on real-time operating conditions and torque demands. When rapid acceleration is needed, the control system increases the torque increment to reduce response time. When smooth operation is prioritized, it reduces the increment. This dynamic adaptation allows the system to achieve both continuous torque variation and fast acceleration response by optimizing the torque variation step according to current vehicle state and driver demand.
3Adaptability or versatility
If the motor operates in multiple conversion modes, then the hybrid power system becomes more versatile, but the torque smoothing control becomes more complex
Solution Approach 1:
The patent implements a universal torque smoothing control strategy that works across multiple motor operation modes (idle mode, first motoring mode, second motoring mode, power generation mode, and regenerative brake mode). The control system uses a unified approach to determine torque variation steps regardless of the specific operating mode, simplifying the control architecture. The system identifies the current mode and applies appropriate torque smoothing parameters pre-configured for each mode, thereby managing complexity while maintaining versatility.
Solution Approach 2:
The system manages multi-mode operation complexity by changing control parameters based on operating mode. Each mode has optimized torque variation step parameters and smoothing constants pre-determined. When the motor transitions between modes, the control system adjusts these parameters accordingly, allowing a single control framework to handle diverse operating conditions without requiring fundamentally different control strategies for each mode.
Data Source
AI summary
A motor torque smoothing process method includes judging the required work mode of the motor (3) and the current work mode of the motor (3); judging the transition process of the motor (3) based on said required work mode and said current work mode; determining the smoothing time parameter of the motor torque and the target torque based on said judged transition process; calculating the increasing step length of the current output torque based on the said detailed smoothing time parameter, the target torque and the current actual output torque; therefore calculating the actual output torque based on said increasing step length and the current actual output torque.