Vehicle Speed Limiting System Driver Consent Mechanism

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Solution Overview

Problem

Existing vehicle speed limiting systems cause unexpected variations in vehicle speed due to automatic switching of speed limit values, leading to a feeling of discomfort for drivers, as they are not informed about or involved in the switching process.

Innovation Solution

A vehicle speed limiting system that includes an acquisition part for obtaining speed limit values, a limiting part to control vehicle force, a determination part to assess the vehicle's state, a display part to show a switching screen page for driver input, and a switching part to change the speed limit value only when the driver explicitly instructs, allowing the driver to be aware and consent to changes in speed limits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the speed limit value is automatically switched when newly acquired, then the system responds quickly to speed limit changes, but the driver experiences unexpected speed variations and discomfort

Engineering Contradiction:

Improveresponse speed to speed limit changesVSAvoiddriver comfort

Core Design Contradiction:

SpeedVSEase of operation

Solution Approach 1:

The system displays a switching screen page before actually switching the speed limit value, allowing the driver to see the upcoming change and prepare mentally. This preliminary notification reduces the shock of sudden speed variations while maintaining the system's ability to respond quickly to new speed limit information.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the speed limit value is automatically switched, then the system maintains up-to-date speed limit information, but the driver feels uncertain about unexpected speed variations

Engineering Contradiction:

Improveaccuracy of speed limit informationVSAvoiddriver awareness of speed limit changes

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The system provides visual feedback by displaying a switching screen page that shows the driver the current and new speed limit values before switching occurs. This feedback loop keeps the driver informed about system actions, reducing uncertainty while maintaining accurate speed limit information.

Inventive Principle:

Principle #23Feedback

3Loss of information

If the switching screen page is displayed for driver input, then the driver is informed and can consent to speed limit changes, but the switching process takes longer

Engineering Contradiction:

Improvedriver awareness and consentVSAvoidtime to switch speed limit values

Core Design Contradiction:

Loss of informationVSLoss of time

Solution Approach 1:

The system requires driver acknowledgment only when the vehicle is in a speed-limited state, not for every speed limit value change. This partial action approach balances driver awareness with efficient switching, avoiding unnecessary delays when driver input is not critical.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentEP3106363B1Vehicle speed limiting system

Publication Date: 2019.05.15 TOYOTA JIDOSHA KK

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AI summary

A speed limit value (611, 612) that is set for a road where a vehicle is travelling is used to limit a driving force of the vehicle. If the speed limit value (611, 612) is newly acquired and the vehicle is in a state where the driving force is limited, a switching screen page (1911, 630) for inputting a switching instruction to switch the speed limit value (611, 612) used to limit the driving force is displayed. Then, if an occupant inputs the switching instruction in response to the switching screen page (1911, 630) being displayed, the speed limit value (611, 612) is switched to the newly acquired speed limit value (612) to be used to limit the driving force.