Dynamic Combustion Torque Control for Drivetrain Protection
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Solution Overview
Problem
Existing methods for controlling internal combustion engines in motor vehicles require significant personnel, cost, and time when adapting to changes in engine power characteristics, leading to potential drivetrain overload and reduced driving performance due to fixed torque limitations.
Innovation Solution
A method that determines the rotational acceleration of the input shaft and calculates the input torque based on the speed reduction ratio-dependent moment of inertia of the drivetrain, allowing for dynamic control of combustion torque to adhere to a predetermined maximum input torque at the transmission, thereby optimizing power delivery and protecting drivetrain components from overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the torque of the internal combustion engine is reduced to a predetermined fixed value, then the drivetrain components are protected from overload, but the driving performance of the motor vehicle is adversely affected
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed torque limitation to a dynamic torque control system. The combustion torque is continuously adjusted based on real-time rotational acceleration of the input shaft, allowing the system to adapt torque limits to actual operating conditions. This enables the drivetrain to operate at maximum safe torque during transient states while maintaining protection during steady-state operation.
Solution Approach 2:
The patent changes the parameter of torque limitation from a static fixed value to a dynamic value that varies with rotational acceleration. By calculating the required combustion torque as a function of rotational acceleration and comparing it with the maximum permissible torque, the system optimizes the torque parameter to balance component protection and driving performance across different operating conditions.
2Power
If the internal combustion engine is modified in terms of power characteristic, maximum torque or maximum rotational speed, then the driving performance is improved, but drive components connected to the engine must be redesigned, reconstructed or retested
Solution Approach 1:
The patent enables parameter changes in engine characteristics without requiring drivetrain redesign by implementing a control system that dynamically adjusts combustion torque. The system uses rotational acceleration data and speed reduction ratios to calculate appropriate torque limits, allowing the drivetrain to adapt to different engine power characteristics through software control rather than physical redesign.
Solution Approach 2:
The control system serves multiple functions: it protects drivetrain components from overload, adapts to different engine characteristics, and optimizes driving performance. By making the torque limitation system universal and adaptable to various engine configurations through parameter adjustment rather than redesign, the patent reduces the complexity associated with modifying drive components.
3Reliability
If a fixed torque limitation is applied to protect the transmission, then component overload is prevented, but more torque cannot be made available in the drivetrain
Solution Approach 1:
The patent resolves this contradiction by making the torque limitation dynamic rather than fixed. The combustion torque is continuously adjusted based on the rotational acceleration of the input shaft, allowing the system to permit higher torque during transient acceleration phases when the drivetrain can handle the load, while maintaining strict limits during steady-state operation to protect components from overload.
Solution Approach 2:
The patent applies partial torque limitation by allowing torque to exceed the fixed limit temporarily during transient states when rotational acceleration indicates the drivetrain can handle the excess load. The limitation is applied partially rather than continuously, maximizing torque availability when safe while maintaining protection when needed.
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 enhances driving performance by making more torque available in the drivetrain without exceeding maximum input torque, lengthening the service life of critical components and reducing the risk of overload, particularly beneficial for manually operated transmissions.
Implementation Method 1
determining an input torque at the input shaft of the transmission based on a product of the rotational acceleration and a speed reduction ratio-dependent moment of inertia of the drivetrain in a section between the input shaft and the drive wheel
Data Source
AI summary
A method controls an internal combustion engine that has a drive output shaft connected to an input shaft of a transmission. The internal combustion engine, the transmission and a drive wheel are encompassed by a drivetrain for the drive of a motor vehicle. The method includes determining a rotational acceleration of the input shaft and determining an input torque at the input shaft of the transmission based on a product of the rotational acceleration and a speed reduction ratio-dependent moment of inertia of the drivetrain in a section between the input shaft and the drive wheel. A combustion torque of the internal combustion engine is controlled such that the input torque adheres to a predetermined maximum input torque at the input shaft of the transmission.