Work Machine Speed Control Using Work Device Revolution Trends
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Solution Overview
Problem
Existing work machines face challenges in controlling vehicle speed effectively when the work state changes instantaneously, leading to discomfort for the driver and inefficient work performance.
Innovation Solution
A work machine configuration that includes a travel electric motor, a drive wheel, a work electric motor, a vehicle speed setter, a number-of-revolutions detector, a number-of-revolutions change behavior calculator, and a vehicle speed controller, which calculates change behavior in work device revolutions and adjusts vehicle speed accordingly to maintain optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If vehicle speed is changed in response to each work speed change detected, then work performance is improved, but driver discomfort increases and operation becomes unstable
Solution Approach 1:
The system performs preliminary analysis of work speed change behavior by calculating the rate of change and determining whether changes are increasing or decreasing. This preliminary assessment allows the control system to predict future work speed trends and adjust vehicle speed proactively, rather than reactively responding to every instantaneous change. By anticipating work speed variations, the system maintains productivity while avoiding excessive vehicle speed adjustments that would discomfort the driver.
Solution Approach 2:
The control system dynamically adjusts the vehicle speed control strategy based on the current work state. When work speed changes are increasing, the system allows larger vehicle speed adjustments; when changes are decreasing or stabilizing, the system reduces adjustment magnitude. This dynamic adaptation enables the system to respond effectively to work demands while maintaining smooth operation that comforts the driver.
2Productivity
If vehicle speed is changed frequently to maintain work speed, then work efficiency is improved, but system stability deteriorates
Solution Approach 1:
The system calculates the rate of change of work speed and determines the trend (increasing or decreasing) before executing vehicle speed adjustments. This preliminary analysis filters out transient fluctuations and identifies genuine work state changes that require response. By distinguishing between temporary variations and sustained trends, the system maintains work efficiency while avoiding unnecessary vehicle speed changes that would destabilize the system.
Solution Approach 2:
The control system continuously monitors work speed changes and uses this feedback to adjust vehicle speed in a controlled manner. The feedback mechanism incorporates the rate of change and trend information, allowing the system to modulate the magnitude and timing of vehicle speed adjustments. This feedback-based control maintains system stability by preventing over-adjustment while ensuring work efficiency is maintained through appropriate responses to genuine work state changes.
3Adaptability or versatility
If vehicle speed control responds to instantaneous work state changes, then work adaptability is improved, but control complexity increases
Solution Approach 1:
The system performs preliminary calculations of work speed change rate and trend determination before executing control actions. This structured preliminary analysis transforms complex instantaneous work state variations into simplified control parameters (rate of change and trend direction) that are easier to process. By pre-processing work state information in this manner, the system achieves high work adaptability while keeping the actual control logic relatively simple and manageable.
Data Source
AI summary
A work machine includes a travel electric motor, a drive wheel rotatable by the travel electric motor, a work electric motor, a work device rotatable by the work electric motor, a vehicle speed setter to set a desired vehicle speed, a number-of-revolutions detector to detect a number of revolutions of the work device, a number-of-revolutions change behavior calculator to calculate change behavior of the number of revolutions over time, a vehicle speed controller configured or programmed to generate a vehicle speed control signal based on the desired vehicle speed and the change behavior, and a travel motor controller configured or programmed to drive the travel electric motor based on the vehicle speed control signal.