Drive Train Starting Component Slip Control
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Solution Overview
Problem
Conventional drive trains with internal combustion engines require starting components that can lead to energy inefficiency and reduced driving comfort during startup operations due to low transmission speeds, while electric motor-driven vehicles lack a mechanism to ensure efficient energy use and comfort without slipping components.
Innovation Solution
A method for operating a drive train with an electric motor and a starting component, such as a friction clutch or hydrodynamic torque converter, that can be actuated or bridged hydraulically, allowing the starting component to transition into a slipping state based on output shaft variables, ensuring energy efficiency and driving comfort by increasing drive source speed and reducing hydraulic pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a starting component is engaged or bridged during startup operation, then energy efficiency is improved, but transmission functionality and driving comfort deteriorate due to insufficient hydraulic pressure supply at low speeds
Solution Approach 1:
The patent applies dynamics by making the starting component's state changeable - transitioning from engaged/bridged to slipping state based on detected transmission errors. The control unit dynamically adjusts the starting component's operation mode in response to real-time feedback from speed sensors, allowing the system to adapt between energy-efficient engaged state and error-preventing slipping state.
Solution Approach 2:
The patent implements feedback by using speed sensors to detect the actual speed of the drive shaft and output shaft, comparing it with expected speed relationships, and using this information to determine when transmission errors occur. This feedback loop enables the control unit to detect errors and trigger the starting component to slip, preventing further error development while maintaining overall system reliability.
2Loss of energy
If a starting component is engaged or bridged during startup operation, then energy efficiency is improved, but driving comfort deteriorates due to slipping of gear-forming shift elements
Solution Approach 1:
The patent applies dynamics by making the starting component's state changeable - transitioning from engaged/bridged to slipping state based on detected transmission errors. The control unit dynamically adjusts the starting component's operation mode in response to real-time feedback from speed sensors, allowing the system to adapt between energy-efficient engaged state and error-preventing slipping state.
Solution Approach 2:
The patent implements feedback by using speed sensors to detect the actual speed of the drive shaft and output shaft, comparing it with expected speed relationships, and using this information to determine when transmission errors occur. This feedback loop enables the control unit to detect errors and trigger the starting component to slip, preventing further error development while maintaining overall system reliability.
3Loss of energy
If the starting component is kept disengaged to avoid slipping losses, then energy efficiency is improved, but transmission errors may occur due to insufficient hydraulic pressure supply
Solution Approach 1:
The patent applies dynamics by making the starting component's state changeable - transitioning from engaged/bridged to slipping state based on detected transmission errors. The control unit dynamically adjusts the starting component's operation mode in response to real-time feedback from speed sensors, allowing the system to adapt between energy-efficient engaged state and error-preventing slipping state.
Solution Approach 2:
The patent implements feedback by using speed sensors to detect the actual speed of the drive shaft and output shaft, comparing it with expected speed relationships, and using this information to determine when transmission errors occur. This feedback loop enables the control unit to detect errors and trigger the starting component to slip, preventing further error development while maintaining overall system reliability.
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 method enhances energy efficiency and driving comfort by maintaining torque transmission during startup and stopping operations, preventing transmission errors, and ensuring proper oil supply, thus maintaining transmission functionality.
Implementation Method 1
The starting component may also be a hydrodynamic torque converter having a hydrodynamic path that can be bridged by a bridging clutch or lock-up clutch
Implementation Method 2
The starting component can be actuated or bridged by hydraulically
Data Source
AI summary
A method for operating a drive train of a motor vehicle includes performing a startup operation of the motor vehicle or a stopping operation of the motor vehicle. A starting component (3) is engaged or bridged during the startup operation or the stopping operation of the motor vehicle. The startup operation is driven by a drive source (1). The method also includes comparing an actual value of an output shaft (22) based variable with a target value of the output shaft (22) based variable during the startup operation or the stopping operation and, on reaching or exceeding a specific deviation of the actual value from the target value, moving the starting component (3) into a slipping state. The starting component (3) transmits torque in the slipping state. A related drive train module for a motor vehicle is also provided.