CVT Controller for Multi-Range Ratio Selection and Solenoid Control
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Solution Overview
Problem
The complexity of controlling continuously variable transmissions (CVTs) arises from the minute gradations in ratio and the need for extended range of ratios, which is compounded by the combination of CVT stages and fixed ratio range splitters, leading to competing optimization criteria for fuel efficiency and performance.
Innovation Solution
An electronic controller is developed to receive input signals from an engine coupled to the transmission, determining an active range and mode to control the final drive ratio by adjusting electronic solenoids, allowing for precise control of the variator's ratio through the position of a rotating planet within the CVT.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple CVT stages and fixed ratio range splitters are combined to extend the range of available ratios, then the range of ratios is extended, but the device complexity increases
Solution Approach 1:
The transmission system is divided into multiple independent stages including CVT stages and fixed ratio range splitters. Each stage can be controlled independently to achieve different final drive ratios, allowing the system to extend its ratio range while managing complexity through modular segmentation.
2Adaptability or versatility
If multiple transmission configurations are used to achieve the same final drive ratio, then the adaptability increases, but the control complexity increases
Solution Approach 1:
The control system dynamically selects and switches between different transmission configurations based on real-time operating conditions, torque requirements, and efficiency criteria. This dynamic adaptability allows the system to optimize performance while managing control complexity through algorithmic decision-making.
Solution Approach 2:
The system changes operational parameters such as torque distribution ratios and configuration selections based on input torque levels and desired output ratios. By adjusting these parameters dynamically, the system achieves multiple configurations for the same final drive ratio while maintaining manageable control through parameter-based optimization.
3Measurement precision
If electronic solenoids are used to control the ratios of transmission portions, then the control precision improves, but the device complexity increases
Solution Approach 1:
Traditional mechanical ratio control mechanisms are replaced with electronic solenoids that provide precise control of transmission ratios through electrical signals. This substitution improves control precision while managing complexity through electronic control systems that offer programmable flexibility and reduced mechanical wear.
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 solution enables optimized control of CVTs by improving flexibility and efficiency in achieving desired ratios, addressing the challenges of ratio control and optimization for various applications.
Implementation Method 1
controlling one or more electronic solenoids that control the ratios of one or more portions of the variable ratio transmission
Data Source
AI summary
An electronic controller for a variable ratio transmission and an electronically controllable variable ratio transmission including a variator or other CVT are described herein. The electronic controller can be configured to receive input signals indicative of parameters associated with an engine coupled to the transmission. The electronic controller can also receive one or more control inputs. The electronic controller can determine an active range and an active variator mode based on the input signals and control inputs. The electronic controller can control a final drive ratio of the variable ratio transmission by controlling one or more electronic solenoids that control the ratios of one or more portions of the variable ratio transmission.