Automated Driving Speed Control for Fuel-Saving Traffic Jam Approach
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Solution Overview
Problem
Existing automated driving systems may perform unnecessary acceleration and deceleration when approaching a traffic jam, leading to inefficient fuel consumption before the vehicle actually joins the jam, as they follow the behaviors of neighboring vehicles.
Innovation Solution
An automated driving method that detects traffic jams ahead and reduces the vehicle speed to a lower target speed than normal, implementing a low fuel consumption mode by gradually decreasing the speed as the vehicle approaches the traffic jam end, using a control system that includes sensors and a driving support system controller to manage engine output and braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the host vehicle follows the behaviors of neighboring vehicles until reaching the end of the traffic jam, then the vehicle can maintain normal automated driving speed, but unnecessary acceleration and deceleration occurs leading to reduced fuel efficiency
Solution Approach 1:
The system performs preliminary detection of traffic jams ahead of the host vehicle and preemptively adjusts the target vehicle speed before the vehicle actually reaches the traffic jam. By detecting the traffic jam position and calculating the distance to it, the system reduces the target speed in advance, allowing the vehicle to approach the traffic jam smoothly without unnecessary acceleration and deceleration cycles, thereby improving fuel efficiency.
2Use of energy by moving object
If the vehicle reduces speed early upon detecting a traffic jam, then fuel consumption is reduced, but the time to reach the traffic jam end is extended
Solution Approach 1:
The system dynamically adjusts the target vehicle speed based on the detected traffic jam position and the host vehicle's current position. The speed reduction is not fixed but adapts to the real-time situation, allowing the vehicle to optimize the balance between fuel consumption and travel time by continuously adjusting the speed profile as it approaches the traffic jam.
3Loss of time
If the host vehicle maintains normal target speed until reaching the traffic jam, then travel time is reduced, but frequent acceleration and deceleration occurs reducing fuel efficiency
Solution Approach 1:
The system applies preliminary anti-action by counteracting the tendency to accelerate when approaching a traffic jam. By detecting the traffic jam ahead and preemptively reducing the target speed, the system prevents the harmful cycle of acceleration and deceleration that would otherwise occur, thereby improving fuel efficiency while still maintaining reasonable travel time.
Data Source
AI summary
An automated driving method for a vehicle includes: determining whether or not a traffic jam is detected ahead of a host vehicle by a distance equal to or more than a predetermined distance on a travel route of the host vehicle during travel by automated driving that brings a vehicle speed close to a target vehicle speed; and in a traffic jam detection time when the traffic jam is detected, reducing the vehicle speed VSP to be lower than a target vehicle speed VSPt0 for the automated driving in a normal time other than the traffic jam detection time.