DCT Parking Mode R Gear Engagement Control
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Solution Overview
Problem
Dual-Clutch Transmissions (DCT) experience delayed driving response and excessive noise due to frequent engagement/disengagement of the R gear during low-speed lurch driving, where reverse and forward driving are repeatedly switched.
Innovation Solution
A method for controlling a vehicle's transmission that senses the accelerator pedal opening degree and checks the engaged gear stage, maintaining R gear engagement in a parking mode if the pedal is not fully opened, and preparing for second gear engagement when the pedal is opened, thereby preventing R gear disengagement and optimizing gear shifts during gear range changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the R gear is disengaged and re-engaged during each gear range change in lurch driving mode, then the transmission can adapt to gear range changes, but driving response is delayed and excessive noise is caused
Solution Approach 1:
The controller determines in advance whether the vehicle is in lurch driving mode by detecting frequent alternation between forward and reverse gear range changes. When lurch driving is detected, the controller pre-establishes a special control mode that maintains R gear engagement, preventing the need for repeated disengagement and re-engagement actions.
Solution Approach 2:
The control system dynamically adjusts the gear engagement strategy based on driving conditions. In normal operation, the R gear is disengaged during gear range changes. However, when lurch driving mode is detected, the system dynamically switches to a mode where the R gear remains engaged, adapting the control behavior to the specific driving situation.
2Adaptability or versatility
If the R gear is disengaged and re-engaged during each gear range change in lurch driving mode, then the transmission can adapt to gear range changes, but excessive noise is caused
Solution Approach 1:
The controller detects lurch driving mode in advance through frequent alternation detection and pre-establishes a special control mode that maintains R gear engagement, preventing the harmful noise from repeated engagement/disengagement cycles before they occur.
Solution Approach 2:
The system converts the potentially harmful effect of maintaining R gear engagement (which could cause gear conflict) into a beneficial outcome by using the engagement state as a noise-reduction mechanism. The engaged R gear acts as a mechanical lock that prevents the harmful engagement/disengagement cycles that generate noise.
3Productivity
If the R gear is frequently engaged and disengaged during lurch driving, then the transmission responds to gear range changes, but the durability of the gear system deteriorates
Solution Approach 1:
The controller performs preliminary detection of lurch driving mode through frequent alternation detection and establishes a protective control mode in advance, preventing repeated gear engagement/disengagement cycles that would deteriorate the gear system over time.
Solution Approach 2:
The control system dynamically adapts its behavior based on detected driving patterns. When lurch driving is detected, the system dynamically maintains R gear engagement to protect the gear system, reducing the frequency of engagement/disengagement cycles while still allowing necessary gear range changes.
Data Source
AI summary
A method for controlling a transmission for a vehicle includes: sensing, by a controller, an opening degree of an accelerator pedal; checking, by the controller, a gear stage engaged with an input shaft, with which a Reverse (R) gear and a second gear of a Dual-Clutch Transmission (DCT) are engageable, if the opening degree of the accelerator pedal is less than or equal to a reference value as a result of the sensing; and controlling, by the controller, the vehicle in a parking mode in which disengagement of the R gear is prevented if the R gear is engaged with the input shaft as a result of the checking.