Vehicle Controller Dynamic Drive Force Shift
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Solution Overview
Problem
Existing vehicle controllers face challenges in smoothly transitioning from automated drive mode to manual drive mode, often resulting in vibrations or noise due to sharp changes in driving force, which affect ride quality and responsiveness to the driver's requests.
Innovation Solution
A vehicle controller that gradually shifts the driving force from automated drive mode to manual drive mode based on driver inputs, adjusting the shift rate according to the operation of accelerator, steering, and brake pedals, ensuring a smooth transition without excessive vibrations or noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the vehicle driving force is shifted rapidly from automated drive mode to manual drive mode, then the responsiveness to driver's request is improved, but large vibrations or noise occur in the driving force transmission mechanism
Solution Approach 1:
The patent applies dynamics by making the shift rate variable rather than fixed. The control unit adjusts the shift rate dynamically based on the operation amount of the operation member (accelerator pedal, brake pedal, or steering wheel). When the operation amount exceeds a threshold, indicating urgent driver intent, the shift rate is increased to improve responsiveness. When the operation amount is small, the shift rate is reduced to minimize vibrations and noise. This dynamic adjustment resolves the contradiction between responsiveness and ride quality.
2Loss of time
If the shift rate of driving force is increased to respond quickly to driver operations, then the responsiveness is improved, but the ride quality deteriorates due to vibrations and noise
Solution Approach 1:
The control unit dynamically adjusts the shift rate based on real-time detection of operation member input. When the operation amount is large (indicating urgent driver intent), the system accepts longer transition time is not critical and uses a higher shift rate to minimize time loss. When the operation amount is small, the system prioritizes ride quality by using a lower shift rate, accepting a longer but smoother transition. This dynamic time-rate adjustment resolves the contradiction between response time and ride quality.
Data Source
AI summary
If an automated drive release request to release the automated drive mode and switch to the manual drive mode is made while the vehicle is travelling in an automated drive mode, a traveling control unit performs control that gradually shifts a vehicle driving force from the vehicle driving force in the automated mode to the vehicle driving force requested by the driver in the manual drive mode.