Vehicle Motion Control Using Predicted Stop Distance

Solution Overview

Problem

Existing automatic driving techniques face challenges in effectively performing acceleration/deceleration suppression control, particularly when multiple preceding vehicles are stopped between the host vehicle and a stop line, leading to inefficiencies in fuel consumption due to variations in vehicle speed and congestion.

Innovation Solution

A motion control device that includes a movement distance acquisition unit, a prediction unit, a control determination unit, and an acceleration/deceleration control unit, which predicts the next movement distance and determines whether to perform acceleration/deceleration control based on this prediction to optimize vehicle motion and reduce fuel consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If acceleration/deceleration suppression control is performed based on stop line position information, then fuel consumption can be improved, but the control effectiveness deteriorates when multiple preceding vehicles are stopped between the host vehicle and stop line

Engineering Contradiction:

Improvefuel consumptionVSAvoidcontrol effectiveness

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The system performs preliminary action by predicting the stop position of preceding vehicles before the host vehicle reaches the stop line. The prediction unit uses stored movement distance information to forecast where preceding vehicles will stop, allowing the host vehicle to plan its acceleration/deceleration suppression control in advance, even when multiple vehicles are present ahead.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback by continuously acquiring actual movement distances of the host vehicle and storing them. This historical data is fed back to the prediction unit to improve future predictions of preceding vehicle stop positions, creating a closed-loop system that adapts to actual traffic patterns and enhances control effectiveness.

Inventive Principle:

Principle #23Feedback

2Speed

If acceleration/deceleration suppression control is performed based on speed limit and relative position with preceding vehicle, then vehicle speed can be controlled, but deceleration position becomes greatly affected by vehicle speed variation of preceding vehicle

Engineering Contradiction:

Improvevehicle speedVSAvoiddeceleration position accuracy

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The system performs preliminary action by predicting the stop position of preceding vehicles before the host vehicle reaches the stop line. The prediction unit uses stored movement distance information to forecast where preceding vehicles will stop, allowing the host vehicle to plan its acceleration/deceleration suppression control in advance, even when multiple vehicles are present ahead.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback by continuously acquiring actual movement distances of the host vehicle and storing them. This historical data is fed back to the prediction unit to improve future predictions of preceding vehicle stop positions, creating a closed-loop system that adapts to actual traffic patterns and enhances control effectiveness.

Inventive Principle:

Principle #23Feedback

3Use of energy by moving object

If acceleration/deceleration suppression control is performed in congested conditions, then fuel consumption can be improved, but the control accuracy deteriorates due to large vehicle speed variations

Engineering Contradiction:

Improvefuel consumptionVSAvoiddeceleration position accuracy

Core Design Contradiction:

Use of energy by moving objectVSMeasurement precision

Solution Approach 1:

The system performs preliminary action by predicting the stop position of preceding vehicles before the host vehicle reaches the stop line. The prediction unit uses stored movement distance information to forecast where preceding vehicles will stop, allowing the host vehicle to plan its acceleration/deceleration suppression control in advance, even when multiple vehicles are present ahead.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system applies parameter changes by utilizing movement distance information as a more stable parameter compared to vehicle speed. By focusing on distance measurements and predictions rather than speed variations, the system maintains control accuracy in congested conditions where speed fluctuates significantly.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11827219B2Motion control device for moving body

Publication Date: 2023.11.28 ASTEMO LTD

AI summary

A motion control device for a moving body is configured to control a motion of a moving body and includes a movement distance acquisition unit, a movement distance storage unit, a movement distance prediction unit, a control determination unit, and an acceleration/deceleration control unit. The acceleration/deceleration control unit performs control of the acceleration/deceleration in the movement direction of the moving body based on a determination result on whether to suppress the acceleration/deceleration of the moving body performed by the control determination unit and the second movement distance predicted by the movement distance prediction unit.