EV Controller Mode Switching for Noise Reduction
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Solution Overview
Problem
Hybrid electric vehicles generate excessive noise when operating in hybrid mode due to the internal combustion engine, which is objectionable, especially in low-speed areas like city centers.
Innovation Solution
A controller automatically switches the vehicle to electric mode when the speed is below a set threshold, allowing the internal combustion engine to be shut down, and adjusts this threshold using a selector device without affecting the actual speed, while charging the battery to a desired reserve charge level for extended electric mode operation, and alerts the operator of mode transitions with an option to bypass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the vehicle operates in hybrid mode to extend driving range, then the driving range is improved, but noise pollution increases due to internal combustion engine operation
Solution Approach 1:
The system dynamically switches between electric mode and hybrid mode based on real-time conditions such as battery state of charge, vehicle speed, and driver demand. This allows the vehicle to operate in quiet electric mode when possible while extending range through hybrid mode when needed, creating a dynamic balance between noise reduction and range extension
Solution Approach 2:
The controller monitors and responds to changing parameters including battery charge level, vehicle speed, and power demand. By adjusting operational parameters and switching modes based on these changes, the system optimizes the balance between electric-only operation (noise reduction) and hybrid operation (range extension)
2Object-generated harmful factors
If the vehicle operates in electric mode to reduce noise, then noise pollution is reduced, but the battery charge level decreases
Solution Approach 1:
The controller continuously monitors battery state of charge and provides feedback to the mode selection logic. When battery charge drops below certain thresholds, the system automatically transitions from electric-only mode to hybrid mode, ensuring the battery is recharged while maintaining noise reduction benefits when sufficient charge is available
Solution Approach 2:
The system dynamically adjusts its operational mode based on real-time battery charge levels. During periods of high charge, the vehicle operates in quiet electric mode; when charge depletes, it transitions to hybrid mode for recharging, creating a dynamic cycle that balances noise reduction with battery maintenance
3Object-generated harmful factors
If the speed threshold for electric mode is lowered to reduce noise, then noise pollution is reduced, but the available speed range for electric mode operation decreases
Solution Approach 1:
The system provides multiple adjustable speed threshold parameters that allow customization of electric mode operation. Drivers can select from different threshold settings (e.g., 30 mph, 45 mph, 60 mph) to balance noise reduction benefits against available speed range, with each parameter change adapting the system's behavior accordingly
Solution Approach 2:
The system dynamically adapts to driver preferences and environmental conditions by allowing threshold parameter adjustments. This enables the vehicle to optimize noise reduction at preferred speed ranges while maintaining flexibility for different driving scenarios and personal preferences
Data Source
AI summary
An exemplary method includes using a controller to automatically operate a vehicle in an electric mode when an actual speed of the vehicle is at or below a set threshold, and to automatically operate the vehicle in a hybrid mode when the actual speed is above the set threshold. The method further including adjusting the set threshold using a selector device such that the set threshold is changed without influencing the actual speed. Another exemplary method includes using a controller to automatically initiate a transition of a vehicle from an electric mode to a hybrid mode, or from the hybrid mode to the electric mode. The controller initiates the transition in response to a comparison of a state of charge of a battery of the vehicle to a threshold state of charge that is configured to be adjusted by an operator.