Work Machine Controller Dynamic Hysteresis Width Adjustment
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Solution Overview
Problem
The existing work range limiting control system for construction machines struggles to simultaneously achieve high working precision and efficiency, as the hysteresis width between approaching and receding distances from the entry prohibited area affects the velocity limitation of actuators.
Innovation Solution
A work machine equipped with an operation device and a controller that performs work range limiting control by changing the hysteresis width based on the operation amount of the operation device, allowing the controller to start and end the control when specific distances are reached, thereby optimizing both precision and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the hysteresis width between approaching and receding distances is made greater, then working precision is improved, but working efficiency is reduced
Solution Approach 1:
The patent applies dynamics by making the hysteresis width variable rather than fixed. The control system dynamically adjusts the hysteresis width based on the operation amount of the operation device: when the operation amount is large (indicating intentional rapid movement), a larger hysteresis width is applied to prevent accidental entry; when the operation amount is small (indicating precise positioning), a smaller hysteresis width is applied to maintain working efficiency. This dynamic adjustment resolves the contradiction between precision and efficiency.
Solution Approach 2:
The patent changes the parameter of hysteresis width based on operation conditions. By monitoring the operation amount of the operation device, the system adjusts the hysteresis width parameter to appropriate values: a first appropriate value when operation amount indicates rapid movement is needed, and a second appropriate value (smaller) when operation amount indicates precise positioning. This parameter change strategy enables the system to achieve both high precision and high efficiency under different working conditions.
2Productivity
If the hysteresis width is made smaller, then working efficiency is improved, but working precision is reduced
Solution Approach 1:
The system dynamically adjusts the hysteresis width based on real-time operation conditions. When the operation device shows small operation amounts (indicating the operator is performing precise positioning work), the system applies a smaller hysteresis width to avoid excessive velocity limitation and maintain working efficiency. When operation amounts are large (indicating rapid movement), a larger hysteresis width is applied to ensure safety and precision. This dynamic behavior resolves the contradiction.
Solution Approach 2:
The control system changes the hysteresis width parameter according to the operation amount detected from the operation device. By setting the hysteresis width to a first appropriate value or second appropriate value based on operation conditions, the system optimizes the balance between precision and efficiency for each specific working scenario, preventing the need to choose between the two fixed options.
Data Source
AI summary
The invention of the present application has as its object the provision of a work machine that is equipped with a function to prevent a work device thereof from going into an entry prohibited area and can satisfy both working precision and working efficiency of the work device. A controller is therefore configured to start work range limiting control to decelerate or stop an action of a machine main body or the work device when a distance between a monitor point set beforehand on the work device and the entry prohibited area decreases to a first distance, to end the work range limiting control when the distance between the monitor point and the entry prohibited area increases to a second distance greater than the first distance, and to change the second distance according to an operation amount of an operation device.