Dual Clutch Transmission Speed Control for Autonomous Parking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Dual clutch transmissions in vehicles experience rapid frictional heat increase and unstable engine starts when engaged at low speeds, leading to inefficient speed control during autonomous parking operations.
Innovation Solution
A vehicle system that adjusts travel speed using clutch torque and brake pressure control, setting a target speed lower than creep driving speed, and dynamically adjusting clutch torque and brake pressure based on incline and speed conditions to maintain efficient speed control and reduce heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If dual clutch transmission is engaged at low speed during autonomous parking, then speed control is achieved, but frictional heat increases rapidly
Solution Approach 1:
The patent changes the control parameters by introducing target speed settings below creep driving speed and dynamically adjusting clutch torque and brake pressure based on speed deviations, thereby reducing clutch engagement time and frictional heat generation
Solution Approach 2:
The patent introduces the brake system as an intermediary component to assist speed control, allowing the clutch to disengage earlier while the brake maintains vehicle speed, thus reducing clutch frictional heat
2Force
If dual clutch transmission is engaged at low speed, then torque transmission is achieved, but engine start becomes unstable
Solution Approach 1:
The patent implements dynamic clutch torque adjustment based on real-time speed feedback, increasing torque when speed drops below target and decreasing it when speed exceeds target, thereby stabilizing engine operation during low-speed autonomous parking
Solution Approach 2:
The patent employs closed-loop feedback control where the controller continuously monitors vehicle speed and adjusts clutch torque accordingly, ensuring stable engine start and operation during autonomous parking maneuvers
3Measurement precision
If clutch torque is increased to maintain speed, then speed control precision is improved, but heat generation increases
Solution Approach 1:
The patent applies partial action by using brake pressure to compensate for speed deviations, allowing the clutch to operate with reduced torque and thereby minimizing heat generation while maintaining adequate speed control precision
Solution Approach 2:
The brake system serves as an intermediary that handles speed control tasks, reducing the burden on the clutch and enabling lower clutch torque operation that generates less heat
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
The system effectively reduces heat generated by the dual clutch, improves speed control during autonomous parking, and enhances the durability and marketability of vehicles with autonomous parking functions by minimizing frictional heat and maintaining clutch torque within a predetermined range.
Implementation Method 1
half clutch may continue at an extremely low speed due to clutch control using direct friction. Accordingly, frictional heat of the clutch may rapidly increase
Implementation Method 2
a brake that makes the vehicle slow down to reduce the travel speed of the vehicle
Data Source
AI summary
A vehicle may include a dual clutch transmission that adjusts a travel speed of the vehicle based on clutch torque, a brake that makes the vehicle slow down to reduce the travel speed of the vehicle, and a controller that sets a target speed of the vehicle and controls the dual clutch transmission and the brake to allow the travel speed of the vehicle to follow the set target speed.