Hydraulic Travel Speed Switching to Reduce Machine Shift Shock
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Solution Overview
Problem
Existing working machines experience speed-change shocks due to variations in response delays of hydraulic equipment and prime movers, which existing technologies fail to adequately address.
Innovation Solution
Incorporating travel pressure detectors to adjust the delay period of speed-change operations based on detected hydraulic pressures and machine states, using a controller to optimize the timing of switching the travel switching valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed delay period is used for speed-change operations, then the control system is simple, but speed-change shocks cannot be reduced when response delays vary
Solution Approach 1:
The delay period is changed from a fixed value to a dynamically adjustable value based on detected travel pressure. The controller adjusts the delay period in accordance with the detected travel pressure to match the actual response characteristics of the hydraulic system, thereby reducing speed-change shocks while maintaining system adaptability.
Solution Approach 2:
A travel pressure detector is introduced to detect the travel pressure of the hydraulic system. The detected pressure information is fed back to the controller, which uses this feedback to adjust the delay period for speed-change operations, creating a closed-loop control system that adapts to varying hydraulic response characteristics.
2Object-affected harmful factors
If the delay period is adjusted based on travel pressure, then speed-change shocks are reduced, but the device complexity increases due to additional sensors and control logic
Solution Approach 1:
The travel pressure detector serves as an intermediary element that provides information about the hydraulic system's state. By detecting travel pressure, the system gains insight into the response characteristics without requiring complex direct measurement of response delays, simplifying the overall control architecture while achieving adaptive delay adjustment.
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
Reduces speed-change shocks by aligning the delay period with hydraulic pressure variations, enhancing operational smoothness and comfort.
Implementation Method 1
at least one travel pressure detector to detect, a travel pressure that is a pressure of the hydraulic fluid delivered by the travel pump to the travel motor
Implementation Method 2
a travel motor rotated by the hydraulic fluid delivered by the travel pump
Data Source
AI summary
In a working machine, a controller decreases a supply amount of a hydraulic fluid from a travel pump to a travel motor based on a travel state of a machine body when a speed-change instruction of increasing or decreasing speed is output by operating a switch, and a pressure detector detects a travel pressure that is a pressure of a hydraulic fluid delivered by the travel pump to the travel motor. In accordance with the travel pressure detected by the travel pressure detector, the controller changes a delay period lasting up to a switching timing of the travel switching valve from an output timing of the speed-change instruction of the switch.