Drive Train Sensitivity Determination via Longitudinal Oscillation
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Solution Overview
Problem
Current methods for determining the drive train sensitivity of a motor vehicle are complex and require significant data or experimental effort, making them inefficient for estimating the susceptibility to judder of a friction clutch.
Innovation Solution
A method involving longitudinal oscillations of a vehicle body, using a linear oscillator with eccentric masses to generate forces that excite the drive train, allowing for the determination of drive train sensitivity through angular acceleration measurements and frequency analysis, with optional use of order sorting filters and coherence validation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If simulation models with parameter identification are used to determine drive train sensitivity, then the determination can be performed without extensive sensor arrays, but the parameter identification requires relatively high expenditures when data is insufficient
Solution Approach 1:
The patent applies mechanical vibration by oscillating the vehicle body in the longitudinal direction at predetermined frequencies using an oscillating device. This vibration excites the drive train system, enabling the determination of drive train sensitivity through measured responses without requiring complex sensor arrays or extensive parameter identification procedures. The vibration-based approach directly stimulates the system to reveal its sensitivity characteristics.
Solution Approach 2:
The patent employs periodic action by oscillating the vehicle body at predetermined frequencies in a periodic manner. This periodic excitation allows for the systematic determination of drive train sensitivity across different frequency ranges, enabling accurate measurement without requiring large amounts of random data for parameter identification.
2Measurement precision
If a large number of vehicle sensors are used to estimate drive train sensitivity, then the measurement data becomes more comprehensive, but the device complexity and cost increase significantly
Solution Approach 1:
By using mechanical vibration of the vehicle body at predetermined frequencies, the system can determine drive train sensitivity with high measurement precision using minimal sensors. The vibration excites the drive train in a controlled manner, allowing accurate sensitivity measurement without requiring comprehensive sensor arrays.
Solution Approach 2:
The oscillating device acts as an intermediary that couples the vehicle body to the drive train system. By introducing this controlled vibration intermediary, the system can measure drive train sensitivity through the transmitted vibrations rather than requiring direct measurement at multiple points throughout the drive train, thus reducing sensor requirements while maintaining measurement accuracy.
3Ease of operation
If individual test persons evaluate drive train sensitivity, then subjective human assessment is obtained, but the evaluation lacks objectivity and requires significant time and resources
Solution Approach 1:
The patent replaces subjective human evaluation with objective mechanical vibration measurement. By oscillating the vehicle body and measuring the drive train's response through sensors, the system obtains reliable, objective data on drive train sensitivity without requiring test persons, thereby improving both reliability and operational efficiency.
Solution Approach 2:
The patent substitutes the mechanical evaluation process involving test persons with an automated mechanical vibration measurement system. This replacement eliminates subjective human assessment while maintaining ease of operation, providing objective and reliable drive train sensitivity determination through physical measurement rather than human judgment.
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 simplifies and objectifies the determination of drive train sensitivity, reducing experimental effort and enabling accurate estimation of judder susceptibility with minimal sensors, by directly measuring the transfer function at the friction clutch with controlled force excitation.
Implementation Method 1
a linear oscillator with a predetermined eccentric mass is connected to the vehicle body to generate the longitudinal oscillations
Implementation Method 2
a parameter for the drive train sensitivity is determined depending on the longitudinal accelerations of the vehicle body and the resultant angular accelerations of a transmission input shaft
Data Source
AI summary
A method for determines the drive train sensitivity of a drive train of a motor vehicle. A vehicle body is placed in longitudinal oscillations in the direction of travel and a parameter for the drive train sensitivity is determined as a function of the determined longitudinal accelerations of the vehicle body and the resultant angular accelerations of a transmission input shaft of a transmission of the motor vehicle.