Curved-Road Deceleration Assistance With Adaptive Speed Thresholds

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Solution Overview

Problem

When a vehicle is traveling on a curved road, the deceleration control may be executed unnecessarily, leading to discomfort for the operator as they judge the vehicle speed to be sufficiently decreased.

Innovation Solution

A deceleration assistance apparatus that adjusts the target vehicle speed by a predetermined value or suspends deceleration control when a predetermined condition, such as a detected decrease in deceleration speed, is met, ensuring the operator feels comfortable.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If deceleration control is executed to maintain vehicle speed on curved roads, then vehicle speed control is improved, but operator comfort deteriorates due to unnecessary deceleration

Engineering Contradiction:

Improvevehicle speed controlVSAvoidoperator comfort

Core Design Contradiction:

SpeedVSEase of operation

Solution Approach 1:

The system dynamically adjusts the deceleration control strategy based on real-time detection of deceleration speed trends. When a decreasing trend is detected, the system determines that operator-initiated deceleration is already occurring and adjusts or suspends automated deceleration control accordingly, making the control system adaptive to operator intentions

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system continuously monitors deceleration speed and detects trends in deceleration performance. This feedback mechanism allows the system to identify when the operator is already decelerating the vehicle and use this information to adjust the automated deceleration control, preventing conflicting or unnecessary deceleration actions

Inventive Principle:

Principle #23Feedback

2Manufacturing precision

If deceleration control is continuously applied to achieve target vehicle speed, then speed precision is improved, but operator comfort worsens due to unnecessary intervention

Engineering Contradiction:

Improvevehicle speed precisionVSAvoidoperator comfort

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

Instead of continuously applying full deceleration control to maintain speed precision, the system applies partial or suspended deceleration control when detection indicates the operator is already decelerating. This reduces unnecessary intervention while maintaining adequate speed control through selective application of deceleration force

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS20250065870A1Deceleration assistance apparatus, deceleration assistance method, and storage medium

Publication Date: 2025.02.27 TOYOTA JIDOSHA KK

AI summary

A deceleration assistance apparatus executes deceleration control that decelerates a vehicle when a vehicle speed of the vehicle is greater than a target vehicle speed set as a target value of a vehicle speed of the vehicle when the vehicle travels on a curved road. The deceleration assistance apparatus is configured to cause the target vehicle speed to be greater by a predetermined value or is configured to not execute the deceleration control even when the vehicle speed of the vehicle is greater than the target vehicle speed when a predetermined condition in which a decrease of a deceleration speed of the vehicle is detected when the vehicle travels on the curved road is met.