Vehicle Driving Assistance Control for Gradient-Aware Coasting
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Solution Overview
Problem
Existing vehicle driving assistance systems face inefficiencies in maintaining speed and distance control while optimizing energy efficiency, particularly on varying road gradients and speeds, leading to excessive deceleration or acceleration that decrease energy efficiency.
Innovation Solution
A vehicle driving assistance system that includes an electronic control unit to execute autonomous acceleration/deceleration controls, switching to coasting or power running based on road gradient and speed conditions, and terminating these controls when predetermined conditions are met to maintain optimal energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If autonomous acceleration/deceleration control using coasting is executed on an upward slope, then energy efficiency is improved on even roads, but the deceleration rate becomes too great and control stability deteriorates
Solution Approach 1:
The system changes the control parameters by detecting road gradient and vehicle speed, and terminates autonomous acceleration/deceleration control when the gradient exceeds a threshold or speed is too high, switching to alternative control modes to maintain stability while preserving energy efficiency benefits in suitable conditions
2Use of energy by moving object
If autonomous acceleration/deceleration control using coasting is executed on a downward slope, then energy efficiency is improved, but the vehicle speed increases excessively and control precision deteriorates
Solution Approach 1:
The system monitors vehicle speed and road gradient in real-time, and when coasting on a downward slope causes speed to exceed predetermined thresholds, the system terminates the autonomous acceleration/deceleration control to prevent excessive speed increase, thereby maintaining control precision while still allowing energy-efficient coasting in appropriate conditions
3Speed
If autonomous acceleration/deceleration control using coasting is executed at high vehicle speed, then deceleration control is achieved, but movement resistance increases and energy efficiency deteriorates
Solution Approach 1:
The system detects vehicle speed as a control parameter and terminates autonomous acceleration/deceleration control when speed exceeds a predetermined threshold, preventing the execution of coasting control at high speeds where movement resistance is excessive, thereby maintaining energy efficiency while still providing deceleration control capability at appropriate speeds
Data Source
AI summary
A vehicle driving assistance apparatus executes an autonomous acceleration/deceleration control to maintain an own vehicle moving speed within a predetermined speed range, or maintain an inter-vehicle distance within a predetermined distance range, executes a coasting control when the deceleration of the own vehicle is requested in a situation where the autonomous acceleration/deceleration control is being executed, and executes a power running control when the acceleration of the own vehicle is requested in the situation where the autonomous acceleration/deceleration control is being executed. The vehicle driving assistance apparatus terminates executing the autonomous acceleration/deceleration control when a predetermined condition relating to at least one of a gradient of a road on which the own vehicle is moving and the moving speed of the own vehicle in the situation where the autonomous acceleration/deceleration control is being executed.