Vehicle Engine Sound Enhancement Speed Limiter Feedback
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Solution Overview
Problem
In vehicles equipped with both a speed limiter and an engine sound enhancement system controlled by the accelerator pedal position, the engine sound enhancement system changes sound in response to accelerator pedal position changes when there is no change in engine state, leading to an undesirable perception of acceleration when the speed limiter prevents actual acceleration.
Innovation Solution
A method and system that reduce the level of engine sound enhancement as the vehicle approaches the set maximum speed, ultimately providing no enhancement when the vehicle reaches the set maximum speed, by determining a speed-based gain based on the difference between the set and measured vehicle speeds, and combining this with accelerator pedal position-based gains to produce engine harmonic enhancement signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the engine sound enhancement system adjusts gain based on accelerator pedal position, then the engine sound enhancement responds to driver input, but the system produces false acceleration perception when speed limiter is engaged
Solution Approach 1:
The system introduces feedback by monitoring vehicle speed and comparing it against the speed limiter setting. When the vehicle approaches the speed limit, the system reduces the accelerator pedal position-based gain adjustment, preventing false acceleration perception while maintaining responsiveness during normal operation
Solution Approach 2:
The system dynamically adjusts the gain based on multiple parameters including accelerator pedal position, vehicle speed, and speed limiter settings. The gain calculation changes behavior depending on whether the vehicle is operating below or near the speed limit, creating a dynamic response that adapts to driving conditions
2Object-affected harmful factors
If the engine sound enhancement system maintains consistent sound at maximum speed, then the false acceleration perception is prevented, but the system reduces adaptability to driver input
Solution Approach 1:
The system applies different gain adjustment strategies in different operating conditions: full responsiveness to accelerator pedal position when below speed limit, and reduced responsiveness when approaching the speed limit. This local differentiation maintains overall system adaptability while preventing false perception in specific conditions
3Object-affected harmful factors
If the system reduces enhancement level as vehicle approaches maximum speed, then consistent sound is maintained, but the system complexity increases
Solution Approach 1:
The system uses a universal gain calculation framework that handles both normal operation and speed limiter conditions through a single unified algorithm. The same gain calculation structure adapts its behavior based on the relationship between current speed and speed limit, avoiding the need for separate control systems
Data Source
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AI summary
A method includes providing a fundamental frequency corresponding to the RPM of an engine of a vehicle; determining a plurality of harmonics of the fundamental frequency; and determining a target shape of the plurality of harmonics. The target shape includes, for each of the harmonics of the plurality of the harmonics, a gain value as a function of the RPM of the engine. The method also includes determining an accelerator pedal position (APP) based gain that includes a gain value as a function of an accelerator pedal position; and determining a speed based gain that includes a gain value as a function of a difference between a set maximum speed and a measured vehicle speed. The method further includes combining the plurality of harmonics, the target shape of the plurality of harmonics, the APP based gain, and the speed based gain to produce a set of engine harmonic enhancement signals.