Clutch Actuation Force Modulation for Torque Control
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Solution Overview
Problem
Existing machine control systems, particularly those with impeller clutches, are sub-optimal in torque modulation for applications requiring different torque levels, leading to inefficiencies and operator control challenges during tasks like digging and truck loading.
Innovation Solution
A machine control system that includes sensors to determine current machine applications and varies the actuation force of the clutch accordingly, using a controller to adjust the engagement of the clutch based on the application, thereby improving torque modulation and responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the clutch pedal modulation is preset for higher torque applications, then torque control resolution is improved for digging applications, but torque modulation becomes insufficient for low torque applications like truck loading
Solution Approach 1:
The system dynamically adjusts the clutch actuation force based on detected machine applications. The controller modifies the clutch engagement in real-time according to whether the machine is digging, loading, or traveling, allowing optimal torque control for each specific application rather than using a fixed modulation curve
Solution Approach 2:
The system changes the clutch actuation parameter (actuation force) based on the detected application. By identifying the current machine application through sensors and changing the clutch engagement parameter accordingly, the system achieves both high resolution control for digging and appropriate modulation for low torque applications
2Device complexity
If a single impeller clutch pedal control is used, then device complexity is reduced, but control precision for different applications deteriorates
Solution Approach 1:
The system uses sensors to detect machine application conditions and provides feedback to the controller, which then adjusts the clutch actuation force accordingly. This closed-loop feedback mechanism enables precise torque control for different applications while maintaining a simple single-pedal interface
Solution Approach 2:
The control system automatically detects the machine application and self-adjusts the clutch engagement without requiring the operator to manually select different control modes. The system serves itself by using sensor data to determine the appropriate clutch actuation force
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
The system enhances torque control and responsiveness across various applications by automatically adjusting clutch engagement, reducing operator burden and maintaining consistent performance, while simplifying the control logic and reducing complexity.
Implementation Method 1
The torque converter is a fluid coupling that multiplies and/or absorbs torque fluctuations transmitted between the engine and the traction devices of the machine by allowing slippage between an output shaft of the engine and an input shaft of the transmission
Implementation Method 2
The impeller clutch allows for high engine speeds while limiting the amount of torque that is transmitted into the torque converter
Data Source
AI summary
A machine control system for use with a machine having a power source and a transmission is disclosed. The machine control system may have a clutch configured to connect an output of the power source with an input of the transmission. The machine control system may also have a sensors configured to generate signals indicative of machine operations, and a controller in communication with the clutch and the sensors. The controller may be configured to determine the current machine application based on the signals, and vary an actuating force of the clutch based on the type of machine application.