Drivetrain Clutch Control Using Micro-Slip and Overpressing
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Solution Overview
Problem
Conventional drivetrain systems, particularly double clutch transmissions, face challenges in achieving efficient operation and high driving comfort due to micro-slip-induced slip losses and comfort impairments during shifting, as they either experience micro-slip or overpressing, which can lead to excessive energy consumption and perceived deceleration.
Innovation Solution
A method where an electronic computing device adjusts micro-slip and overpressing phases in a targeted manner to minimize slip losses and maintain comfortable operation, by controlling micro-slip during specific operating phases and using determined control parameters to adjust clutch torque, thereby optimizing energy efficiency and shifting quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the clutch is operated with micro-slip to improve driving comfort during shifting, then driving comfort is improved, but energy consumption increases due to slip losses
Solution Approach 1:
The control unit periodically switches between micro-slip operation mode and overpressing operation mode based on driving conditions. During shifting phases, micro-slip mode is activated to ensure comfort, while during steady-state driving, overpressing mode is used to minimize energy losses, creating a periodic alternation between the two operational states
Solution Approach 2:
The clutch operation is dynamically adjusted by the control unit based on real-time driving conditions, transmission state, and slip magnitude. The system transitions between static overpressing state and dynamic micro-slip state, allowing the clutch to adapt its operational characteristics to optimize both comfort and efficiency
2Ease of operation
If the clutch is operated with micro-slip to ensure smooth shifting, then shifting quality is improved, but slip losses increase leading to reduced efficiency
Solution Approach 1:
The system implements periodic switching between micro-slip and overpressing modes, activating micro-slip only during necessary shifting operations and returning to overpressing mode afterward, thereby limiting the duration and magnitude of energy losses from slip
Solution Approach 2:
The control unit dynamically changes the slip parameter by transitioning between micro-slip (small speed difference) and overpressing (zero slip) states, adjusting the degree of slip based on whether shifting is required, thus optimizing the trade-off between shifting quality and energy efficiency
3Use of energy by moving object
If the clutch is operated with overpressing to minimize slip losses, then energy efficiency is improved, but driving comfort deteriorates due to perceived deceleration
Solution Approach 1:
The control unit periodically alternates between overpressing mode (for efficiency) and micro-slip mode (for comfort during shifting), ensuring that overpressing is only maintained when it does not compromise driving comfort or shifting quality
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
This approach allows for reduced energy and fuel consumption while maintaining high driving comfort by minimizing slip losses and ensuring precise clutch torque adjustment, even during shifting, thus enhancing the overall efficiency and comfort of the drivetrain operation.
Implementation Method 1
a first friction-based clutch component (28) disposed on the input side (24) and a second friction-based clutch component (30) disposed on the output side (26)
Data Source
AI summary
A method for operating a clutch of a drivetrain for a motor vehicle, in which at least one micro-slip of the clutch is adjusted in a targeted manner by means of an electronic computing device of the drivetrain, whereby the clutch is operated with the micro-slip during at least one operating phase, wherein an overpressing of the clutch is adjusted in a targeted manner by means of the electronic computing device), whereby the clutch is operated slip-free during at least one second operating phase that is different from the at least one operating phase.