Active Dampening of Torsional Damper Start-Up Resonance
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Solution Overview
Problem
Existing methods for starting an internal combustion engine using a starter generator often result in significant start-up resonance and rotational irregularities due to torsional elasticity, requiring additional hardware to mitigate these issues.
Innovation Solution
Applying a counter excitation to the torque generated by the starter generator, modulated based on engine parameters such as crankshaft angle, speed, and rotation differences, to actively dampen the start-up resonance without additional hardware, using software-based control to reduce resonant vibrations and rotational irregularities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a starter generator is used to start the internal combustion engine, then the starting function is achieved, but start-up resonance and rotational irregularities occur due to torsional elasticity
Solution Approach 1:
The patent changes the torque parameter of the starter generator dynamically during the starting process. By modulating the torque according to a counter excitation function that depends on crankshaft angle and speed, the system actively compensates for resonant vibrations without requiring additional mechanical components. This parameter change approach transforms the starter generator from a simple starting device into an active vibration control system.
Solution Approach 2:
The patent replaces potential mechanical solutions (such as additional starters or complex clutch mechanisms) with an electronic control approach. By using software-based control to modulate the starter generator torque, the system achieves vibration dampening without adding mechanical complexity, effectively substituting a mechanical problem with an electronic control solution.
2Object-affected harmful factors
If additional hardware is added to mitigate start-up resonance, then resonance dampening is improved, but device complexity increases
Solution Approach 1:
The patent makes the starter generator multi-functional by enabling it to perform both the starting function and the active vibration control function. Through software-based torque modulation, the same component that starts the engine also actively dampens resonant vibrations during starting. This eliminates the need for separate vibration control hardware, reducing overall system complexity while maintaining effectiveness.
Solution Approach 2:
The system uses the starter generator's own torque output as the means to control vibrations. By modulating its own torque according to real-time engine parameters, the starter generator serves itself to eliminate the harmful resonance it initially caused, rather than requiring an entirely separate control mechanism.
3Object-affected harmful factors
If counter excitation is applied to dampen resonance, then rotational irregularities are reduced, but torque control complexity increases
Solution Approach 1:
The patent implements a feedback control system where the starter generator torque is continuously adjusted based on real-time measurements of crankshaft angle and engine speed. The counter excitation is modulated according to these feedback parameters, creating a closed-loop control system that automatically adapts to changing engine conditions during the starting process, effectively reducing rotational irregularities through dynamic torque adjustment.
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 effectively reduces start-up resonance and rotational irregularities in the torsional damper, allowing for the use of low-friction torsional elasticities in the drive train and improving the starting process by compensating for resonant vibrations and compression/expansion torques.
Implementation Method 1
the counter excitation is modulated on the basis of a parameter of the internal combustion engine which changes when the internal combustion engine is being started. The counter excitation compensates for the resonant vibrations of the internal combustion engine and the torsional damper
Implementation Method 2
The counter excitation is advantageously modulated on the basis of a crankshaft angle with a harmonic excitation of the nth order of the internal combustion engine
Implementation Method 3
a torsional damper (4) fixed between the internal combustion engine (1) and a secondary side (5) of a torsional elasticity
Data Source
AI summary
A method actively dampens a start-up resonance of a torsional damper when starting an internal combustion engine. The torsional damper (4) is fixed between an internal combustion engine (1) and a secondary side (5) of a torsional elasticity, and the internal combustion engine (1) is started using a starter generator (3) arranged on a side of the internal combustion engine (1) counter to the torsional elasticity. A counter excitation is applied to a torque generated by the starter generator (3) when the internal combustion engine (1) is started, which counter excitation is modulated on the basis of a parameter of the internal combustion engine (1) which changes when the internal combustion engine (1) is being started.