Construction Machine Lever Control for Auto-Idle Power Reduction
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Solution Overview
Problem
Construction machines with auto idle control often inadvertently cancel power reduction when a control lever is accidentally operated, leading to unnecessary return to normal power state, reducing energy-saving effects.
Innovation Solution
A construction machine with a controller that performs power reduction control based on operation states of control levers, setting different time thresholds for power reduction cancellation depending on the duration of lever non-operation, to minimize erroneous power state changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If power reduction control is canceled when a control lever is operated, then the system responds to control lever operation, but erroneous operations cause unnecessary cancellation of power reduction control, increasing energy consumption
Solution Approach 1:
The patent applies dynamics by making the time threshold dynamic rather than fixed. The control device adjusts the time threshold based on the operation history of control levers - specifically, it sets a longer time threshold when control levers have been operated recently and a shorter time threshold when they have not been operated recently. This dynamic adjustment allows the system to adapt to different operational contexts, preventing erroneous operations from triggering unnecessary power reduction cancellations while still responding appropriately to genuine operational needs.
Solution Approach 2:
The patent changes the parameter of time threshold based on operational context. By monitoring whether control levers have been operated within a certain period and adjusting the time threshold accordingly, the system modifies its sensitivity to control lever operations. This parameter change enables the system to distinguish between intentional operations (when levers were recently operated) and erroneous operations (when levers have not been operated recently), thereby reducing unnecessary energy consumption.
2Device complexity
If a fixed time threshold is used for power reduction control, then the control logic is simple, but it cannot distinguish between intentional and erroneous control lever operations
Solution Approach 1:
The patent transforms the static time threshold into a dynamic one that adapts based on control lever operation history. The control device continuously monitors whether control levers have been operated and adjusts the time threshold accordingly - extending it when operations are detected and shortening it when they are not. This dynamic approach significantly improves the reliability of distinguishing intentional from erroneous operations without adding substantial complexity to the control logic.
Solution Approach 2:
The patent implements feedback by using the operation status of control levers to adjust the time threshold for power reduction control. The control device receives feedback from control lever operations and modifies its behavior accordingly. This feedback mechanism enables the system to learn from operational patterns and improve its accuracy in detecting genuine operational intentions versus erroneous operations, thereby enhancing reliability.
Data Source
AI summary
It is made possible to perform power reduction control during non-operation of control levers, and suppress power consumption of a power source when a control lever is moved by an erroneous operation, and thus reduce energy consumption. Accordingly, a controller 50 performs the power reduction control when a non-operation time exceeds a set time after a transition is made from a state in which at least one control lever is operated to a non-operation state in which none of the control levers is operated, and the controller 50 cancels the power reduction control when at least one control lever is operated in a state in which the power reduction control is performed. In addition, the set time is set as a first set time Tth1 when an operation time until at least one of levers 14 and 34 makes a transition to the non-operation state is longer than a monitoring time Tth0, and the set time is set as a second set time Tth2 shorter than the first set time Tth1 when the operation time until the at least one control lever makes a transition to the non-operation state is shorter than the monitoring time Tth0.