CVT Input Shaft Vibration Compensation for Stable Ratio Control
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Solution Overview
Problem
Existing continuously variable transmission systems face instability and insufficient damping effects due to fixed lead compensation, leading to potential vibration issues and system instability, especially when the operating state of the vehicle changes.
Innovation Solution
A control device for continuously variable transmissions that adjusts the lead amount based on the vibration frequency of the input shaft and performs phase delay compensation with a variable delay amount according to the vehicle's operating state, ensuring stability and effective damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lead amount is increased to improve damping performance, then the damping effect is enhanced, but the transmission ratio control system becomes unstable
Solution Approach 1:
The lead amount is made variable rather than fixed, allowing the control system to adapt the lead compensation amount based on actual operating conditions. This dynamic adjustment enables the system to achieve sufficient damping performance while maintaining stability by avoiding excessive fixed lead amounts.
Solution Approach 2:
The lead amount parameter is changed from a fixed value to a variable value that can be adjusted according to operating state. This parameter change allows the system to optimize the balance between damping performance and control stability under different conditions.
2Device complexity
If the lead amount is fixed for peak value frequency, then the control system is simple, but the damping performance becomes insufficient under varying operating conditions
Solution Approach 1:
The control system transitions from static fixed lead compensation to dynamic variable lead compensation. The lead amount is adjusted based on detected vibration frequency and operating state, enabling the system to maintain effective damping performance across varying conditions without requiring complex fixed configurations for every scenario.
Solution Approach 2:
The system incorporates feedback mechanisms to detect the actual vibration frequency of the input shaft and adjust the lead amount accordingly. This feedback loop allows the control system to respond to changing operating conditions and maintain optimal damping performance without excessive complexity.
3Object-affected harmful factors
If lead compensation is performed to suppress longitudinal vibration, then vibration suppression is improved, but the transmission ratio stability may be compromised due to insufficient damping
Solution Approach 1:
The lead amount is dynamically adjusted based on the detected vibration frequency and operating state, allowing the system to provide sufficient damping for vibration suppression while maintaining transmission ratio stability. The variable lead compensation adapts to different operating conditions to balance these two requirements.
Solution Approach 2:
The control parameters including lead amount and delay amount are changed from fixed values to variable values that adapt to operating conditions. This enables the system to achieve both vibration suppression and transmission ratio stability by optimizing the compensation parameters for each operating state.
Data Source
AI summary
A control device for a continuously variable transmission mounted in a vehicle, includes a lead compensation unit and a delay compensation unit. The lead compensation unit is configured to perform phase lead compensation in a transmission ratio control system of the continuously variable transmission according to an operating state of the vehicle with a lead amount being variable according to a vibration frequency of a torsional vibration of an input shaft of the continuously variable transmission. The delay compensation unit is configured to perform phase delay compensation in the transmission ratio control system with a delay amount being variable according to the operating state of the vehicle.