CVT Control Device Phase Compensation for Vibration
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Solution Overview
Problem
Continuously variable transmissions face challenges in achieving sufficient damping while maintaining stability, as lead compensation can be insufficient or lead to system instability due to varying operating conditions, causing longitudinal vibration and resonance issues.
Innovation Solution
A control device for continuously variable transmissions that employs feedback control with phase lead and delay compensation, dynamically adjusting peak value frequencies based on transmission ratios and resonance frequencies to ensure stability and suppress vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If lead compensation amount is increased to improve damping performance, then vibration suppression is improved, but system stability deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the lead compensation amount based on operating conditions (engine speed, vehicle speed, acceleration). Instead of using a fixed large lead compensation amount that causes instability, the system adapts the compensation parameter to match actual operating states, achieving effective vibration suppression while maintaining system stability.
Solution Approach 2:
The patent implements dynamics by making the lead compensation amount variable rather than fixed. The compensation amount changes dynamically according to engine speed, vehicle speed, and acceleration conditions. This dynamic adjustment allows the system to achieve optimal damping performance across different operating states without causing instability that would result from consistently high compensation values.
2Object-affected harmful factors
If lead compensation is fixed for peak value frequency, then damping performance is improved, but adaptability to varying operating conditions deteriorates
Solution Approach 1:
The patent makes the lead compensation system dynamic by adjusting the compensation amount based on real-time operating conditions including engine speed, vehicle speed, and acceleration. This dynamic adaptation ensures effective vibration suppression across varying operating states rather than being fixed for a single peak frequency condition.
Solution Approach 2:
The system changes the lead compensation parameter according to operating conditions. By monitoring engine speed, vehicle speed, and acceleration, the system adjusts the compensation amount to match current operating states, maintaining effective vibration suppression adaptability across different driving scenarios.
3Object-affected harmful factors
If larger lead amount is used to ensure damping, then vibration suppression is improved, but transmission ratio control stability deteriorates
Solution Approach 1:
The patent adjusts the lead compensation parameter based on operating conditions to achieve optimal damping without excessive compensation. By changing the compensation amount to match actual operating states, the system provides sufficient damping effect while preventing the transmission ratio control instability that would result from consistently large lead amounts.
Solution Approach 2:
The system dynamically adjusts the lead compensation amount rather than using a consistently large fixed value. This dynamic approach ensures adequate damping effect is provided when needed while maintaining transmission ratio control stability by avoiding excessive compensation that would occur with fixed large lead amounts.
Data Source
AI summary
A control device for a continuously variable transmission performs feedback control so that an actual transmission control value becomes a target transmission control value. The control device includes a phase lead compensation unit configured to perform phase lead compensation of the feedback control, a phase delay compensation unit configured to perform phase delay compensation of the feedback control, a first peak value frequency determination unit configured to change a peak value frequency of the phase lead compensation according to a transmission ratio of the continuously variable transmission, and a second peak value frequency determination unit configured to change a peak value frequency of the phase delay compensation based on the peak value frequency of the lead compensation.