Work Vehicle Hydraulic System Bypass for Implement Shaking
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Solution Overview
Problem
Work vehicles, such as wheel loaders, face insufficient responsiveness in their hydraulic systems when operators attempt to rapidly move implements, like buckets, for shaking operations due to low bandwidth in the load sensing system, which restricts the ability to effectively remove dirt or debris.
Innovation Solution
A system and method that involves a controller to deactivate the load sensing system when an implement shaking operation is detected, transitioning the hydraulic system from a variable to a static pump mode with a maximum pressure and flow output, allowing for enhanced responsiveness during rapid implement movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the load sensing system is used to adjust the pump output, then the hydraulic system operates efficiently under normal conditions, but the bandwidth is too low to provide rapid responsiveness for implement shaking operations
Solution Approach 1:
The system dynamically switches between two operational modes: normally operating through the load sensing system for efficient control, and temporarily bypassing it during shaking operations to achieve higher bandwidth and responsiveness. This dynamic reconfiguration allows the system to adapt its characteristics based on operational requirements.
Solution Approach 2:
The system changes the operational parameters of the hydraulic circuit by altering the flow path during shaking operations. Specifically, it bypasses the load sensing system to remove its bandwidth limitation, thereby changing the system's dynamic characteristics to suit rapid implement movement requirements.
2Productivity
If the operator moves the control lever rapidly to shake the implement, then the implement can be moved quickly, but the load sensing system's low bandwidth prevents sufficient responsiveness
Solution Approach 1:
The invention extracts or removes the load sensing system from the hydraulic circuit during shaking operations by providing an alternative flow path that bypasses it. This eliminates the bandwidth limitation imposed by the load sensing system and enables the hydraulic pump to respond more rapidly to control lever movements.
Solution Approach 2:
The system introduces an intermediary mechanism (the bypass flow path controlled by the third position of the control lever) that allows hydraulic fluid to flow directly to the tilt cylinder without passing through the load sensing system, thereby mediating between the pump and cylinder to achieve higher responsiveness.
3Power
If the load sensing system remains active during shaking operations, then pump output is regulated, but the system cannot provide sufficient pressure and flow for rapid implement movement
Solution Approach 1:
The system dynamically reconfigures the hydraulic circuit based on the operational phase. During shaking operations, it switches to a mode that prioritizes power delivery by bypassing the load sensing system, allowing maximum pressure and flow to reach the implement actuator for effective shaking.
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
Enables improved responsiveness and effectiveness in operator-commanded implement movements, such as shaking, by providing sufficient pressure and flow for rapid operations while maintaining efficient hydraulic system performance.
Implementation Method 1
a pump configured to supply pressurized hydraulic fluid to the implement actuator
Implementation Method 2
The controller is configured to control an operation of a load bypass valve to deactivate the load sensing system
Data Source
AI summary
A method for controlling the operation of a work vehicle includes initially controlling an operation of an implement actuator of the vehicle based on operator inputs received from an input device while a load sensing system of the vehicle is operable to adjust an output of an associated pump. The method also includes receiving an input providing an indication that an implement-based movement operation is to be performed and deactivating the load sensing system in response to the indication that the implement-based movement operation is to be performed. In addition, the method includes controlling the operation of the implement actuator based on further operator inputs received from the input device to perform the implement-based movement operation while the load sensing system is deactivated.