HEV Engine Operating Point Control for Clearer Voice Input
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Solution Overview
Problem
In hybrid electric vehicles, the noise generated by the powertrain interferes with voice command inputs and outputs, reducing recognition rates and making it difficult for drivers to recognize sound guides, especially in noisy environments.
Innovation Solution
A method and system that determine specific conditions for noise reduction by controlling the engine's operating point, switching between engine-on and engine-off modes, and using a starter/generator motor to charge the battery, thereby reducing powertrain noise during voice input and output operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the engine operates to provide power in an HEV, then the vehicle can maintain driving capability, but noise is generated that interferes with voice input and output functions
Solution Approach 1:
The control unit predicts whether voice input or output functions will be used in the future and proactively adjusts the engine operating point or terminates engine operation before the voice function is actually activated, thereby preventing noise interference in advance
Solution Approach 2:
The system dynamically adjusts the engine operating point based on real-time conditions and predicted voice function usage, switching between different operating modes (including termination) to optimize both power delivery and noise reduction
2Measurement precision
If the engine operating point is changed to reduce noise, then voice recognition rate improves, but vehicle power output may be affected
Solution Approach 1:
The control unit predicts future voice function usage and adjusts the engine operating point in advance to a lower noise level, ensuring optimal voice recognition conditions are already in place before the voice function is activated
Solution Approach 2:
The system changes the engine operating point parameters (such as RPM and torque) to levels that produce less noise, while the control unit manages power delivery to maintain overall vehicle performance
3Object-affected harmful factors
If the engine is terminated to eliminate noise, then voice input and output clarity improves, but the vehicle cannot maintain driving power
Solution Approach 1:
The control unit predicts whether the vehicle will need power soon and decides in advance whether to terminate the engine or maintain operation, switching to electric motor power if termination is chosen
Solution Approach 2:
The starter/generator motor acts as an intermediary, allowing the engine to be terminated while maintaining vehicle power through electric motor operation, and enabling quick engine restart when power is needed
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances voice recognition rates and improves the driver's ability to recognize voice guides by minimizing powertrain noise, ensuring effective voice command input and output functionality in hybrid electric vehicles.
Implementation Method 1
a starter/generator motor charges a battery with the power of the engine
Data Source
AI summary
A hybrid electric vehicle (HEV) and a method of supporting sound input and output for the same, the method comprising: determining whether a first condition for a sound input and output function and a second condition for an internal noise level are satisfied; determining whether operation termination of an engine is possible when the first condition and the second condition are satisfied; controlling the HEV to be driven in a first mode when the operation termination of the engine is impossible; and performing noise reduction control by changing an operating point of the engine.