Vehicle Control System for Autonomous Engine Noise Suppression
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Solution Overview
Problem
Conventional autonomous vehicles experience engine noise issues due to speed changes in autonomous mode, which are not aligned with the driver's intention, leading to discomfort.
Innovation Solution
A vehicle control system that adjusts the transmission's upshifting point to a lower speed ratio in autonomous mode compared to manual mode, selecting a gear stage with a smaller speed ratio and estimating required driving force to reduce engine speed and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the upshifting point is set for manual mode, then the driving force response is improved, but the engine noise increases in autonomous mode
Solution Approach 1:
The patent applies dynamics by making the upshifting point adjustable based on the operating mode. The transmission control system dynamically changes the upshifting point threshold between manual mode (higher threshold for better response) and autonomous mode (lower threshold for reduced engine speed and noise), allowing the system to adapt its gear shifting behavior to different operational contexts.
Solution Approach 2:
The patent changes the speed ratio parameter of the transmission by shifting the upshifting point to a lower speed ratio in autonomous mode. This parameter change reduces the engine speed at which upshifting occurs, thereby reducing engine noise during autonomous operation while maintaining adequate driving force through appropriate gear selection.
2Object-generated harmful factors
If the transmission speed ratio is reduced in autonomous mode, then the engine noise is suppressed, but the driving force may be insufficient
Solution Approach 1:
The system dynamically adjusts the upshifting point based on the operating mode detection. In autonomous mode, the upshifting point is set to a lower speed ratio to reduce engine noise, while in manual mode, it is set to a higher speed ratio to ensure adequate driving force response. This dynamic adjustment resolves the contradiction by adapting the transmission behavior to the specific operational context.
Solution Approach 2:
The transmission control system uses feedback from the operating mode detection to adjust the upshifting point. The control unit receives information about whether the vehicle is in manual or autonomous mode and accordingly modifies the speed ratio threshold for upshifting, ensuring that the transmission operates optimally for the current mode while balancing noise reduction and driving force requirements.
Data Source
AI summary
A vehicle control system configured to suppress engine noise in an autonomous mode is provided. An operating mode of the vehicle can be switched between a manual mode in which a driving force and a braking force of the vehicle are controlled by a manual operation and an autonomous mode in which the driving force and the braking force of the vehicle are controlled autonomously. The vehicle control system is configured to shift an upshifting point for reducing a speed ratio of a transmission to a low speed side in the autonomous mode, in comparison with the upshifting point set in the manual mode.