Range Extender Noise Control Using Real-Time Sound Pressure Limits
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Solution Overview
Problem
Existing noise, vibration, harshness (NVH) solutions for range extenders in vehicles are off-line control methods, which fail to account for varying environmental and ambient factors during travel, leading to potential sound pressure level exceedance and reduced comfort and efficiency.
Innovation Solution
A method for controlling range extenders through real-time sound pressure level adjustments, using a pre-established working condition database to determine and adjust target calibration conditions based on environmental noise and vehicle-specific sound quality limits, ensuring the range extender operates within acceptable sound pressure levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If off-line control methods are used for range extenders, then the control system is simple and easy to implement, but the sound pressure level may exceed limits under varying environmental conditions, reducing comfort and efficiency
Solution Approach 1:
The patent implements dynamic control by transitioning from static off-line control to real-time online control that continuously monitors environmental noise levels and adjusts range extender operating parameters accordingly. The system dynamically selects working conditions from a pre-established database based on real-time sound pressure level measurements, ensuring the range extender operates within acceptable noise limits while adapting to changing environmental conditions.
Solution Approach 2:
The patent incorporates feedback mechanisms by measuring actual sound pressure levels in real-time and using this information to adjust range extender operation. The system continuously compares measured environmental noise against pre-established working conditions and modifies operating parameters to maintain compliance with noise limits, creating a closed-loop control system that responds to actual acoustic conditions.
2Object-affected harmful factors
If real-time sound pressure level adjustments are implemented, then sound pressure level compliance is maintained under varying environmental conditions, but the control system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing a comprehensive working condition database containing multiple operating scenarios with different sound pressure level characteristics before actual vehicle operation. This pre-computed database allows the real-time control system to simply query and select appropriate working conditions based on measured environmental noise, significantly reducing the computational complexity of real-time control while maintaining sound pressure level compliance.
Solution Approach 2:
The patent utilizes parameter changes by systematically varying range extender operating parameters (such as power output, rotational speed, or load) across different working conditions in the pre-established database. The real-time control system selects and switches between these pre-defined parameter sets based on environmental noise levels, achieving complex adaptive control through simple parameter selection rather than complex real-time calculations.
3Ease of operation
If the range extender operates based on fixed working conditions, then the control logic is simple, but the efficiency and comfort are reduced when environmental conditions change
Solution Approach 1:
The patent implements dynamics by enabling the range extender to transition between fixed and adaptive control modes. The system maintains simple control logic through pre-established working conditions but introduces dynamic adaptation by selecting from multiple pre-computed operating scenarios based on real-time environmental noise measurements, thereby improving efficiency without significantly complicating control implementation.
Solution Approach 2:
The patent applies parameter changes by preparing multiple sets of operating parameters in advance, each optimized for different environmental conditions. The control system simply selects the appropriate parameter set based on measured noise levels, achieving improved efficiency through parameter variation while maintaining ease of operation through a selection-based rather than calculation-based control approach.
Data Source
AI summary
A method for controlling a range extender includes obtaining a sound pressure level of environmental noises and obtaining a real-time fitted sound quality limit for a vehicle in a traveling procedure; processing the sound pressure level and the real-time fitted sound quality limit to obtain a sound pressure level margin, determining a working condition corresponding to a sound pressure level lower than or equal to the sound pressure level margin, and taking the working condition as a target calibration working condition; obtaining a respective corrected sound pressure level by performing correction through a correcting sound pressure function based on the sound pressure level and a respective sound pressure level of the range extender in each working condition; and comparing the real-time fitted sound quality limit corresponding to the target calibration working condition with a corresponding corrected sound pressure level, and adjusting the target calibration working condition based on the comparison.