Trailing Throttle Clutch Control for Engine Speed Reduction
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Solution Overview
Problem
Existing methods for operating motor vehicles in trailing throttle mode either waste energy due to continuous primary drive operation or require restarting the primary drive for acceleration, leading to inefficiencies in energy use and fuel consumption.
Innovation Solution
A method that detects trailing throttle mode and automatically adjusts the intermediate device's state to reduce the rotational speed of the primary drive shaft, minimizing energy losses by varying the clutch engagement and gear changes in a twin clutch transmission, allowing the primary drive to idle at a reduced speed to conserve energy without requiring restart.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the primary drive operates continuously in trailing throttle mode, then the vehicle can accelerate quickly when needed, but energy is wasted due to internal losses (compression, mechanical losses) converting kinetic energy into non-usable forms
Solution Approach 1:
The clutch is adjusted dynamically between fully engaged and fully disengaged states based on driving conditions. In trailing throttle mode, the clutch is partially engaged to create intermediate states that allow selective energy transfer, reducing internal losses while maintaining acceleration capability when needed.
Solution Approach 2:
The regulating variable of the clutch is changed to create intermediate engagement states. By varying the clutch engagement parameter, the system can control torque transfer between the primary drive and wheels, optimizing the balance between energy conservation and acceleration performance.
2Loss of energy
If the clutch is disengaged during trailing throttle mode to prevent primary drive from absorbing kinetic energy, then energy losses are reduced, but the primary drive must be restarted for acceleration
Solution Approach 1:
The clutch operates in dynamic intermediate states rather than binary engaged/disengaged positions. This allows the primary drive to remain connected without fully absorbing kinetic energy, and enables seamless transition to acceleration without complete disengagement and restart.
Solution Approach 2:
The primary drive maintains continuous operation with the clutch in intermediate states, preventing complete disengagement. This ensures the drive system remains ready for acceleration while minimizing energy absorption during coasting, eliminating the need for restart.
3Speed
If the clutch is completely engaged in trailing throttle mode, then the primary drive remains connected for quick acceleration, but fuel consumption increases due to continuous operation
Solution Approach 1:
The clutch regulating variable is adjusted to create intermediate engagement states during trailing throttle mode. This reduces torque transfer and fuel consumption compared to full engagement, while maintaining sufficient connection for quick acceleration response.
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 reduces internal losses and conserves energy by maintaining a controlled rotational speed during coasting, enabling quick acceleration while minimizing fuel consumption and eliminating the need for the primary drive to restart.
Implementation Method 1
the torque which is transferred via the intermediate device is to be changeable by varying a regulating variable (which in the example more or less directly relates to the clutch)
Data Source
AI summary
In a motor vehicle with an adjustable coupling (intermediate device) between the (crank)shaft and floor contact elements (wheels), wherein the coupling is set in trailing throttle mode in such a way that the rotational speed of the shaft is reduced, in particular is adjusted to a predefined value, in order to reduce the internal losses of the drive, in particular an internal combustion engine.