Torque Command Generation for Eco-Friendly Vehicle NVH Reduction
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Solution Overview
Problem
Eco-friendly vehicles face challenges in achieving rapid reaction and response to driver inputs while effectively reducing noise, vibration, and harshness (NVH) problems caused by torsion and backlash in the drive system, particularly during significant changes in driving force, which existing solutions fail to address adequately.
Innovation Solution
A driving torque command generating apparatus and method that includes a driving input value detector, motor speed detector, and wheel speed detector, which provide torsional state information to a controller to generate a motor torque command, combining feedforward and feedback torque commands to correct for torsion and backlash in real-time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If torque gradient control and filtering methods are used to reduce NVH problems, then noise, vibration, and harshness are reduced, but vehicle response speed to driver inputs deteriorates
Solution Approach 1:
The control system dynamically adjusts the torque command generation based on real-time torsional state information. The controller switches between different control modes (feedforward, feedback, or combined) depending on the current operating conditions and torsional vibrations detected, allowing optimal balance between NVH reduction and response speed under varying conditions
Solution Approach 2:
The system changes control parameters based on the torsional state. When torsional vibrations are detected through motor speed and wheel speed comparison, the controller modifies torque command parameters to reduce vibrations. This parameter adaptation allows the system to maintain rapid response while reducing NVH when needed
2Speed
If significant change in driving force is applied to achieve rapid vehicle response, then vehicle response to driver inputs is improved, but torsion and backlash in drive system increase causing NVH problems
Solution Approach 1:
The feedforward torque command is generated in advance based on predicted driving requirements and torsional state. This preliminary torque application counteracts upcoming torsional vibrations before they fully develop, allowing rapid vehicle response while preventing NVH problems from occurring in the first place
Solution Approach 2:
The feedback torque command continuously monitors the torsional state by comparing motor speed with wheel speed. When torsion and backlash are detected, the controller generates corrective feedback torque to counteract these harmful effects, enabling the system to maintain rapid response while actively reducing NVH problems caused by drive system torsion
3Object-affected harmful factors
If existing torque gradient control and filtering methods are used, then NVH problems are reduced, but the number of process steps becomes excessive
Solution Approach 1:
The feedforward and feedback torque commands are merged into a single integrated control process. The controller simultaneously processes driving input values, motor speed, and wheel speed to generate a combined torque command that achieves NVH reduction without requiring separate, sequential control steps, thereby simplifying the overall control architecture
Data Source
AI summary
A driving torque command generating apparatus and method of an eco-friendly vehicle are provided. The apparatus and method obtain rapid reaction and response of the vehicle in response to a driving input while effectively reducing NVH problems caused by torsion and backlash of a drive system even during a significant change in driving force caused by the driving input. Torsional state information of a vehicle drive system is obtained from input information regarding a motor speed and a wheel speed detected by a motor speed detector and a wheel speed detector. A motor torque command is generated based on a driving input value input by a driving input value detector and the obtained torsional state information.