Gear Position Display Synchronization with Actual Speed-Changing

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Solution Overview

Problem

Current gear position display devices in automatic transmissions do not effectively align with the actual state of speed-changing, causing an uneasy feeling for drivers as the display changes before they recognize the speed change.

Innovation Solution

A gear position display device that detects the actual start of speed-changing based on the rate of change in rotation number and only displays the target gear position when speed-changing is confirmed, reducing driver unease by synchronizing the display with the actual speed-changing state.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the gear position is displayed concurrently with the output of the speed-changing instruction, then the responsiveness of the display is improved, but the driver experiences an uneasy feeling because the display changes before the driver recognizes the speed-changing

Engineering Contradiction:

Improveresponsiveness of displayVSAvoiddriver unease

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The system uses feedback from the detection portion that monitors the rotation number to determine when speed-changing has actually been recognized by the driver. The display is updated only after this feedback confirms the driver perceives the speed change, resolving the contradiction between responsiveness and driver comfort

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The detection portion performs preliminary detection of the speed-changing state by monitoring rotation number changes before triggering the display update. This preliminary action ensures the display only changes when the driver has actually perceived the speed change, preventing premature display updates that cause unease

Inventive Principle:

Principle #10Preliminary action

2Object-affected harmful factors

If the gear position display is updated only after confirming actual speed-changing, then driver unease is reduced, but the display responsiveness decreases

Engineering Contradiction:

Improvedriver uneaseVSAvoiddisplay update delay

Core Design Contradiction:

Object-affected harmful factorsVSLoss of time

Solution Approach 1:

The system dynamically adjusts the display update timing based on real-time detection of speed-changing state. Rather than using a fixed delay or immediate update, the display responds dynamically when the detection portion confirms the driver has perceived the speed change, optimizing both comfort and responsiveness

Inventive Principle:

Principle #15Dynamics

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This solution accurately detects the start of speed-changing and reduces driver unease by ensuring the gear position display aligns with the actual state of speed-changing, improving the user experience by preventing premature display changes.

Implementation Method 1

the change rate detection portion detecting a rate of change in a rotation number of the transmission

Methodology Applied

Scientific EffectRate of change detection:

Data Source

PatentUS7891266B2Gear position display device of transmission

Publication Date: 2011.02.22 TOYOTA JIDOSHA KK

AI summary

A gear position display device includes a transmission having a plurality of gear positions, a speed-changing control portion outputting a speed-changing instruction, a display portion displaying a gear position of the transmission, and a detection portion detecting a speed-changing state of a gear position based on the speed-changing instruction, wherein a gear position based on the speed-changing instruction from the speed-changing control portion is displayed after the detection portion confirms actual starting of speed-changing.