Dual Power Drive Torque Allocation for EV Resonance Suppression
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Solution Overview
Problem
Four-wheel drive new energy vehicles experience high-frequency electromagnetic noise and vibration due to their power drive systems, which affect the smooth operation of the vehicle, and existing solutions increase system complexity and volume.
Innovation Solution
A vehicle torque processing method that adjusts torque allocation between the first and second power drive systems based on current torque requirements and peak torque values to minimize vibration and noise without increasing hardware costs or complexity, by optimizing torque output when the first power drive system resonates or enters an NVH bad zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an independent vibration damping mechanism is added to attenuate high-frequency vibration, then vibration and noise are reduced, but system complexity and system volume increase excessively
Solution Approach 1:
The patent replaces the mechanical vibration damping mechanism with a control algorithm that processes torque signals. The vehicle controller detects resonance conditions and adjusts torque allocation between power drive systems using signal processing and control strategies, eliminating the need for physical damping components while achieving vibration and noise reduction.
Solution Approach 2:
The patent changes the operational parameters of the power drive systems by dynamically adjusting torque allocation based on detected resonance conditions. The controller modifies torque magnitude and distribution between front and rear power drive systems to avoid resonance frequencies and reduce vibration, rather than adding physical damping elements.
2Object-affected harmful factors
If an independent vibration damping mechanism is added to attenuate high-frequency vibration, then vibration and noise are reduced, but system volume increases excessively
Solution Approach 1:
The patent replaces the mechanical vibration damping mechanism with a control algorithm that processes torque signals. The vehicle controller detects resonance conditions and adjusts torque allocation between power drive systems using signal processing and control strategies, eliminating the need for physical damping components while achieving vibration and noise reduction.
Solution Approach 2:
The vehicle controller performs multiple functions including torque allocation, resonance detection, and vibration suppression using the same control system infrastructure. The existing controller hardware is utilized for vibration suppression tasks, eliminating the need for separate dedicated damping components and reducing overall system volume.
3Object-affected harmful factors
If torque allocation is optimized to reduce vibration and noise, then smooth operation is improved, but power performance may be affected
Solution Approach 1:
The patent implements dynamic torque allocation that continuously adapts to operating conditions. The controller adjusts torque distribution between power drive systems in real-time based on detected resonance conditions, vehicle speed, and load requirements, ensuring power performance is maintained while reducing vibration when resonance is detected.
Solution Approach 2:
The patent uses feedback from vibration sensors and resonance detection to continuously monitor system operation. The controller receives feedback about vibration levels and resonance conditions, then adjusts torque allocation accordingly, creating a closed-loop control system that balances vibration reduction with power performance requirements.
Data Source
AI summary
A vehicle torque processing method, apparatus, and a vehicle controller are provided. The method includes allocating torque to the first power drive system and a second power drive system based on required torque, where a sum of first torque output by the first power drive system and second torque output by the second power drive system is equal to the required torque. At a current vehicle speed, if an intrinsic frequency of the first power drive system is a frequency in a resonance frequency range corresponding to the first power drive system, based on the required torque and peak torque of the second power drive system, the torque output by the first power drive system and the torque output by the second power drive system are adjusted.