Vehicle Driving Assistance Control for Coasting-Braking Switching
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Solution Overview
Problem
Existing vehicle driving assistance systems face challenges in executing coasting control without interfering with deceleration assistance control, and vice versa, leading to inefficient energy consumption.
Innovation Solution
A vehicle driving assistance apparatus equipped with an electronic control unit that determines whether to execute coasting control or deceleration assistance control based on predetermined conditions and driving operation information, allowing for seamless transition between the two controls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the deceleration assistance control is executed to autonomously decelerate the vehicle when a deceleration target is detected, then the vehicle can maintain safe following distance and avoid collisions, but the coasting control cannot be executed and energy consumption increases
Solution Approach 1:
The system dynamically adjusts control mode based on real-time driving conditions. When a deceleration target is detected during coasting control, the ECU evaluates whether to switch to deceleration assistance control or continue coasting by analyzing the relationship between required deceleration rate and actual deceleration rate, ensuring optimal energy efficiency while maintaining safety
Solution Approach 2:
The system changes the control parameter from pure coasting control to deceleration assistance control based on the deceleration rate relationship. When the required deceleration rate is greater than the actual deceleration rate during coasting, the system switches to deceleration assistance control to ensure safe following distance is maintained
2Use of energy by moving object
If the coasting control is executed to reduce energy consumption when no deceleration target is detected, then energy efficiency improves, but the vehicle may not respond timely when a deceleration target appears
Solution Approach 1:
The system continuously monitors the relationship between required deceleration rate and actual deceleration rate during coasting control. When the required deceleration rate exceeds the actual deceleration rate, the feedback mechanism triggers a switch to deceleration assistance control, ensuring timely response to deceleration targets while maintaining energy efficiency during normal coasting
3Reliability
If the system switches between coasting control and deceleration assistance control based on deceleration target detection, then driving safety is improved, but control system complexity increases
Solution Approach 1:
The ECU performs multiple functions by evaluating the relationship between required deceleration rate and actual deceleration rate. This single evaluation mechanism serves both to maintain safe following distance and to determine appropriate control mode switching, simplifying the overall control system while ensuring driving safety
Data Source
AI summary
A vehicle driving assistance apparatus executes a deceleration assistance control of autonomously applying a braking force to an own vehicle to decelerate the own vehicle, and a coasting control of causing the own vehicle to coast. The apparatus executes the coasting control when a predetermined coasting condition becomes satisfied in a situation where the apparatus does not detect a deceleration target which creates a need to decelerate the own vehicle. The vehicle driving assistance apparatus executes the deceleration assistance control when the apparatus detects the deceleration target in a situation where the predetermined coasting condition is not satisfied. The apparatus determines whether to execute the coasting control depending on driving operation information on a driving operation carried out by an operator of the own vehicle when the apparatus detects the deceleration target in a situation where the predetermined coasting condition is satisfied.