Regenerative Valve Control for Work Implement Tilt Stability
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Solution Overview
Problem
Conventional control systems for machines like dozers fail to effectively manage excessive tilting of work implements during operations, particularly due to uneven load distribution, leading to improper control and perception issues for operators.
Innovation Solution
A control system with regenerative valves that regulate fluid flow between tilt cylinders, allowing for selective restriction of fluid communication based on operational parameters, such as displacement or velocity, to prevent over-tilting and maintain balanced movement during dump cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional control systems are used to control tilt cylinders, then the implement can be tilted and rotated based on operator input, but excessive tilting occurs due to uneven load distribution during dumping
Solution Approach 1:
The control system continuously monitors the actual position and movement of the implement through sensors and compares it with the desired position. Based on this feedback, the controller adjusts the fluid flow to the tilt cylinders to correct excessive tilting and maintain stable implement positioning during dumping operations
Solution Approach 2:
The patent replaces conventional mechanical flow control mechanisms with an electronically controlled hydraulic system. The controller uses electronic signals to regulate fluid flow to the tilt cylinders, enabling more precise and adaptive control compared to traditional mechanical systems, thereby preventing excessive tilting while maintaining operator ease of operation
2Productivity
If the implement tilts excessively during dumping, then material can be dumped, but the tilting movement creates a perception of improper control and prevents the operator from setting the desired position
Solution Approach 1:
The system uses sensors to detect the actual implement position and provides continuous feedback to the controller. The controller compares this feedback with the desired position and adjusts fluid flow accordingly, ensuring the implement reaches and maintains the desired dumping position reliably, preventing operator frustration while maintaining productivity
Solution Approach 2:
The control system dynamically changes operational parameters such as fluid flow rate, pressure, and cylinder extension speed based on the dumping phase and detected load conditions. This adaptive parameter adjustment ensures smooth, controlled tilting throughout the dumping cycle, maintaining control precision while enabling efficient material discharge
3Device complexity
If fluid communication between tilt cylinders is regulated using conventional means, then some tilting control is achieved, but the system cannot independently control each cylinder during dump cycles
Solution Approach 1:
The control system divides the fluid control into independent channels for each tilt cylinder. Each cylinder has its own controlled fluid passage with adjustable flow restriction, allowing independent control of each cylinder's movement. This segmentation enables the system to address uneven load distribution and achieve precise, differentiated control of each cylinder during dumping operations
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 reduces undesirable tilting and ensures precise control of work implements, maintaining balanced displacements and velocities of tilt cylinders, thereby improving operational stability and operator control.
Implementation Method 1
the controller is configured to vary an amount of restriction in each regenerative valve to regulate an amount of fluid flowing between the rod end and the cap end of the corresponding tilt cylinder
Implementation Method 2
a fluid source configured to provide a supply of pressurized fluid
Implementation Method 3
a pair of tilt cylinders in fluid communication with the fluid source... configured to operatively tilt the work implement
Data Source
AI summary
A control system for a work implement of a machine having a frame is provided. The control system includes a fluid source configured to provide a supply of pressurized fluid and a pair of tilt cylinders in fluid communication with the fluid source. The tilt cylinders are configured to operatively tilt the work implement with respect to the frame of the machine. Each of the tilt cylinders has a rod end and a cap end between which a regenerative valve is disposed to selectively allow fluid communication between the rod end and the cap end of a corresponding tilt cylinder. The control system further includes a controller communicably coupled to each of the regenerative valves. The controller is configured to vary an amount of restriction in each regenerative valve to regulate an amount of fluid flowing between the rod end and the cap end of the corresponding tilt cylinder.