Coasting Mode Deactivation Threshold Control
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Solution Overview
Problem
Existing methods for automatically deactivating the coasting operating mode in motor vehicles with internal combustion engines are complex and unreliable, particularly when driving on roads with negative gradients, as they rely on noisy acceleration signal differentiation or satellite navigation for gradient determination.
Innovation Solution
A method that sets a threshold value as the sum of a minimum vehicle speed and a maximum permissible increase in speed to automatically deactivate the coasting operating mode, allowing continuous adaptation of the threshold based on current vehicle speed and using a coasting prohibition marker to control mode activation and deactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If satellite navigation is used to determine negative gradient for deactivating coasting mode, then vehicle safety is improved, but device complexity increases
Solution Approach 1:
The patent extracts the gradient determination function from complex satellite navigation systems and implements it using simple onboard sensors (accelerometer, GPS speed, odometer) already present in the vehicle, eliminating the need for external satellite navigation infrastructure while maintaining deactivation reliability
Solution Approach 2:
The vehicle's existing sensor system serves itself to determine the negative gradient by calculating vehicle acceleration from speed changes and comparing it against threshold values, making the system self-sufficient without requiring external satellite navigation services
2Measurement precision
If acceleration signal differentiation is used to detect negative gradient, then deactivation accuracy is improved, but measurement precision deteriorates due to noisy signals
Solution Approach 1:
The patent applies filtering and smoothing algorithms to the acceleration signal before comparison with threshold values, cushioning against the noisy differentiation effects and preventing false deactivation triggers while maintaining detection accuracy
Solution Approach 2:
The patent introduces an intermediary processing stage that transforms the noisy differentiated acceleration signal into a reliable control signal through filtering and threshold comparison, mediating between the raw sensor data and the coasting mode control decision
3Use of energy by moving object
If coasting operating mode is activated on negative gradient, then fuel consumption is reduced, but vehicle speed control stability deteriorates due to undesired acceleration
Solution Approach 1:
The patent implements continuous feedback by monitoring vehicle acceleration during coasting mode and automatically deactivating the mode when acceleration exceeds threshold values, creating a closed-loop control system that maintains speed stability while preserving fuel efficiency
Solution Approach 2:
The patent dynamically adjusts the coasting mode status based on real-time vehicle conditions, allowing the mode to be activated during stable coasting on negative gradients but automatically deactivating when undesired acceleration occurs, providing adaptive speed control
Data Source
AI summary
A method and a device for automatically deactivating a coasting operating mode in a motor vehicle with an internal combustion engine is disclosed. An activated coasting operating mode is deactivated if the current vehicle speed exceeds a threshold value. The threshold value is set as the sum of a minimum vehicle speed and of a maximum permissible increase in speed.