AMT Launch Mode Segmentation for Stable Take-up Control
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Solution Overview
Problem
Dry clutches in automatic manual transmissions (AMT) and dual clutch transmissions (DCT) struggle to maintain stable take-up control due to torque and engine speed variations, leading to unstable vehicle performance during low-speed driving and launch conditions.
Innovation Solution
A method for controlling vehicle driving modes, including creep, launch, and tip-out modes, using a controller to determine conditions for mode transitions based on accelerator position sensor signals, engine torque, and clutch sleep states, dividing the launch mode into four parts (engine torque increase, engine speed increase, engine speed hold, and sleep termination) to ensure stable and flexible control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a dry clutch is used in AMT or DCT to enable take-up control, then the vehicle can achieve manual transmission efficiency and compact design, but the clutch cannot sufficiently absorb torque variation causing unstable take-up control performance
Solution Approach 1:
The launch mode is segmented into four distinct control stages: engine torque increase part, engine speed increase part, engine speed hold part, and sleep termination part. Each stage has specific control parameters and transition conditions, allowing precise management of the clutch engagement process to maintain stability while achieving reliable launch performance.
Solution Approach 2:
The control system dynamically adjusts engine torque and clutch sleep amount based on real-time vehicle state, accelerator position, and engine torque conditions. The system transitions between different control modes (creep, launch, tip-out) and stages within launch mode to adapt to varying operating conditions, ensuring stable take-up control across different scenarios.
2Reliability
If the clutch sleep amount is increased to improve take-up control stability, then torque variation absorption improves, but the response time for mode transitions and launch execution increases
Solution Approach 1:
The controller pre-establishes four control stages with predetermined transition conditions before launch execution. By preparing the control framework in advance with clear entry and exit conditions for each stage, the system can execute rapid mode transitions without compromising the stability provided by controlled clutch sleep management.
Solution Approach 2:
The system dynamically changes control parameters including engine torque targets, clutch sleep amounts, and stage transition thresholds based on vehicle state and driver input. This allows the system to maintain stability through parameter adjustment rather than relying solely on increased sleep amounts, thereby reducing transition time.
3Manufacturing precision
If the controller implements detailed multi-stage launch control with multiple conversion conditions, then take-up control precision and adaptability improve, but the control system complexity increases
Solution Approach 1:
The complex control process is segmented into four manageable stages, each with specific control objectives and transition conditions. This segmentation allows the controller to handle precision requirements in a structured manner, breaking down the complex launch control into discrete, controllable steps that are easier to implement and manage.
Solution Approach 2:
The controller integrates multiple functions including creep mode control, launch mode control with four stages, tip-out mode control, and automatic mode transitions based on various sensor inputs. By consolidating these functions into a single multi-functional control system, the patent manages complexity while achieving high control precision through unified management of all control aspects.
Data Source
AI summary
A system and method for controlling driving of a vehicle is provided. The method includes initiating a creep entry by determining whether the vehicle is driven at a low speed that is equal to or less than creep speed during a stop of the vehicle and initiating control in a creep mode. A launch entry is initiated by determining whether both an APS condition in which an APS is equal to or greater than a reference APS in a creep mode and an engine torque condition that an engine torque is equal to or greater than a reference engine torque are satisfied and converting a current mode into an launch mode. A tip-out entry is initiated by determining whether an APS is less than the reference APS in a launch mode and converting a current mode into a tip-out mode for gradually reducing the engine torque.