DCT Lurch Control via Motor Torque Intervention
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Solution Overview
Problem
Double Clutch Transmissions (DCTs) face limitations in heat resistance, transmission efficiency, and control speed, particularly when shifting between forward and reverse gears, leading to slower reaction times and limited vehicle speed control.
Innovation Solution
An apparatus and method for controlling vehicle shifting that includes a controller sensing shift lever positions and determining LURCH control mode based on holding time and vehicle speed, maintaining clutch torque, and changing motor torque to rapidly shift gears by reversing the motor's rotational direction when a threshold speed is reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a traditional DCT is used for gear shifting, then power transmission is maintained, but the reaction speed is lower and vehicle speed control for DR/RD LURCH is limited
Solution Approach 1:
The controller pre-conditions the clutch for rapid engagement by maintaining clutch torque during the shifting process. Before the clutch engages, the control system prepares the torque transmission path, allowing the clutch to engage quickly without torque interruption, thereby achieving fast reaction speed and effective DR/RD LURCH control
2Speed
If clutch torque is maintained during LURCH control mode, then rapid gear shifting is achieved, but clutch heat resistance becomes a limiting factor
Solution Approach 1:
The control system acts as an intermediary by coordinating motor torque changes with clutch engagement. The controller adjusts motor torque to compensate for clutch torque variations during engagement, smoothing the torque transmission and reducing thermal stress on the clutch while maintaining rapid shifting capability
3Adaptability or versatility
If the shift lever position is frequently changed between D and R ranges, then driving flexibility is improved, but vehicle stability deteriorates due to torque fluctuations
Solution Approach 1:
The controller continuously monitors shift lever position, vehicle speed, and clutch torque, and adjusts motor torque in real-time based on this feedback. When the shift lever is moved between D and R ranges, the system detects the change and applies torque compensation to maintain vehicle stability throughout the transition, enabling flexible driving without sacrificing stability
Data Source
AI summary
An apparatus and a method for controlling shifting of a vehicle are provided. The apparatus includes a transmission configured to transmit power generated from by a motor to a vehicle wheel, and a controller configured to control an operation of the transmission. The controller is configured to enter a LURCH control mode when sensing shifting of a shift lever between a D range and an R range during driving to maintain a clutch torque in the transmission, to decrease a vehicle speed by controlling a motor speed, and to shift a gear of the vehicle by changing a motor torque when the vehicle speed reaches a threshold speed.