Coasting Mode Exit Acceleration Control for Vehicle Comfort
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Solution Overview
Problem
Existing vehicles lack a comfortable and efficient coasting mode that maintains distance and speed control functions, leading to uncomfortable transitions out of coasting mode.
Innovation Solution
A device that decouples the drive motor from the drivetrain to enter coasting mode, using sensors to predict and adjust speed and distance, and applies a reduced coasting exit acceleration to maintain comfort and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the drive motor is decoupled from the drivetrain to enter coasting mode, then energy consumption is reduced, but the transition out of coasting mode causes uncomfortable jerk
Solution Approach 1:
The control device determines in advance that the vehicle has exited coasting mode and initiates a reduced acceleration profile. By predicting the exit condition and preparing a gentler acceleration curve beforehand, the system avoids sudden jerk while transitioning from coasting to normal driving, thus maintaining comfort without sacrificing energy efficiency.
2Speed
If standard acceleration is applied upon exit from coasting mode, then speed control function is restored quickly, but comfort is reduced due to excessive jerk
Solution Approach 1:
The control device changes the acceleration parameter from the standard acceleration value to a reduced acceleration value upon detecting coasting mode exit. This parameter modification allows the speed control function to be restored while maintaining comfortable transition by adjusting the acceleration magnitude to be lower than the standard value, thus avoiding excessive jerk.
3Loss of energy
If the vehicle operates in coasting mode with decoupled drive motor, then energy efficiency is improved, but distance and speed control cannot be actively maintained
Solution Approach 1:
The control device continuously monitors vehicle status parameters including speed and distance to preceding vehicle. Based on this feedback, the system determines when the vehicle has exited coasting mode and when active distance and speed control should be restored. This feedback mechanism ensures that energy efficiency is maintained during coasting while reliability of distance and speed control is preserved through active monitoring and timely reactivation.
Data Source
AI summary
A device for controlling the coasting mode of a vehicle in the context of a distance control and/or speed control function of the vehicle. The device is designed to determine that, upon exiting the coasting mode, the vehicle has an actual vehicle speed which lies below a target speed of the distance control and/or speed control function and/or an actual distance to a preceding vehicle, the actual distance lying above a target distance of the distance control and/or speed control function. In response thereto, the device is additionally designed to produce a coasting mode acceleration, which is reduced in comparison to a standard acceleration of the distance control and/or speed control function, for the vehicle in order to bring the actual speed closer to the target speed and/or in order to bring the actual distance closer to the target distance.