Hydraulic Controller Maintaining Work Tool Tilt Angle
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Solution Overview
Problem
Heavy equipment operators face difficulties in maintaining the desired tilt angle of work tools during lifting, leading to potential material spillage due to naturally occurring tilt changes, which existing systems address inadequately by requiring manual adjustments and resulting in sluggish and inaccurate movements.
Innovation Solution
A hydraulic system with a controller that generates flow rate commands for lift and tilt actuators based on operator input, including a scaled flow rate command for tilt actuation during lifting to maintain a fixed work tool orientation, reducing the need for manual tilt adjustments and improving movement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual dual-control procedure is used to adjust tilt cylinder during lifting, then work tool tilt angle can be maintained, but operation becomes difficult and error prone
Solution Approach 1:
The system automatically maintains the desired tilt angle during lifting operations by having the controller independently adjust the tilt cylinder based on lift cylinder position feedback, eliminating the need for manual dual-control and making the system self-regulating
Solution Approach 2:
The system uses feedback from the lift cylinder position sensor to automatically adjust the tilt cylinder position, creating a closed-loop control system that maintains accurate tilt angles without requiring manual intervention
2Object-affected harmful factors
If responsive tool angle adjustment based on angular measurements is used, then material spillage is reduced, but work tool movements become sluggish and inaccurate
Solution Approach 1:
The system proactively adjusts the tilt cylinder position in advance during lifting operations based on predetermined relationships between lift and tilt movements, preventing tilt angle deviation before it occurs rather than reacting after deviation is detected
Solution Approach 2:
The system dynamically adjusts the tilt cylinder flow rate command based on the current lift cylinder position and velocity, creating a dynamic relationship that maintains accurate work tool movements throughout the lifting operation
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 effectively maintains the desired work tool angle during lifting, enhancing accuracy and responsiveness by proactively adjusting for natural tilt changes without requiring the tool to first deviate from the desired orientation, thus reducing material spillage and operator workload.
Implementation Method 1
a pump configured to pressurize fluid
Implementation Method 2
a first valve arrangement configured to meter pressurized fluid from the pump into the first actuator to move a work tool in a first manner
Data Source
AI summary
A hydraulic system for a mobile machine is disclosed. The hydraulic system may have a first actuator, a first valve arrangement, a second actuator, and a second valve arrangement. The hydraulic system may also have at least one operator interface device movable by an operator to generate a first signal indicative of desired work tool movement in a first manner, and a second signal indicative of desired work tool movement in a second manner; and a controller configured to generate a first flow rate command directed to the first valve arrangement based on the first signal, and generate a second flow rate command directed to the second valve arrangement based on the second signal. The controller may also be configured to selectively generate a third flow rate scaled from the first flow rate command and directed to the second valve arrangement based on only the first signal.