Terrain Mode Transmission Shift Lockout for Overheating Prevention

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Solution Overview

Problem

Existing vehicle transmission systems face overheating issues during rough road driving modes, particularly in sand mode, leading to busy shift phenomena that can damage the transmission due to frequent shifting and increased road surface resistance.

Innovation Solution

A method and device that prohibit shifting operations when specific conditions for preventing transmission overheating are met, such as entering a terrain mode, detecting a busy shift phenomenon, and maintaining the gear shifting stage for a reference time to prevent clutch overheating.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If shifting operations are allowed during terrain mode driving, then the transmission can adapt to road conditions, but the transmission overheats due to frequent shifting in sand mode

Engineering Contradiction:

Improvetransmission adaptation to road conditionsVSAvoidtransmission temperature

Core Design Contradiction:

Adaptability or versatilityVSTemperature

Solution Approach 1:

The controller detects busy shift phenomena (frequent shifting within a predetermined time period) and proactively prohibits further shifting operations to prevent transmission overheating before it occurs. This preliminary protective action blocks the harmful effect of continuous frequent shifting that would cause temperature rise.

Inventive Principle:

Principle #9Preliminary anti-action

2Reliability

If frequent shifting operations occur in sand mode, then the vehicle can attempt to optimize traction, but the clutch overheats and durability decreases

Engineering Contradiction:

Improvetraction optimizationVSAvoidclutch durability

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The system converts the harmful effect of busy shift phenomena into a beneficial protective measure by detecting the pattern of frequent shifting and automatically prohibiting further shifts. This transforms the problematic frequent shifting behavior into a trigger for protective action, thereby preserving clutch durability while maintaining the ability to optimize traction when appropriate.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Productivity

If the transmission shifts frequently in response to road surface resistance, then driving performance can be maintained, but the transmission experiences busy shift phenomena causing overheating

Engineering Contradiction:

Improvedriving performanceVSAvoidtransmission reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The controller continuously monitors shifting operations and detects when busy shift phenomena occur (multiple shifts within a predetermined time period). This feedback mechanism allows the system to recognize problematic shifting patterns and respond by prohibiting further shifts, thereby maintaining driving performance while preventing transmission overheating and reliability issues.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11746896B2Method and device for controlling transmission of vehicle

Publication Date: 2023.09.05 HYUNDAI MOTOR CO LTD

AI summary

A method of controlling a transmission of a vehicle, includes determining, by a controller, whether a shift prohibition condition for preventing overheating of the transmission of the vehicle in a terrain mode, which is a rough road driving mode of the vehicle, is satisfied; determining, by the controller, whether a shift operation of the transmission corresponding to a busy shift phenomenon of the transmission is detected when the shift prohibition condition is satisfied; and prohibiting, by the controller, shifting of the transmission when the shift operation of the transmission corresponding to the busy shift phenomenon of the transmission is detected.