Excavator Engine Speed Control for Low-Load Energy Saving
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Solution Overview
Problem
Existing excavator technologies do not effectively reduce energy consumption during low-load operations.
Innovation Solution
The excavator includes a power engine with a rotation speed reduction mechanism that adjusts engine speed before starting low-load operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the power engine operates at high rotation speed continuously, then the excavator can respond quickly to high-load operations, but energy consumption increases during low-load operations
Solution Approach 1:
The power engine's rotation speed is made dynamically adjustable based on operational needs. The control unit varies the rotation speed between high and low states according to whether high-load or low-load operations are detected, allowing the system to adapt its performance characteristics to match actual work requirements rather than maintaining a fixed high-speed state
Solution Approach 2:
The rotation speed parameter of the power engine is changed based on detected operation types. When low-load operations are detected, the control unit reduces the rotation speed parameter to a lower value, thereby reducing energy consumption while maintaining sufficient performance for the actual work being performed
2Power
If the power engine maintains high rotation speed, then sufficient power is available for high-load operations, but wasteful energy consumption occurs during low-load operations
Solution Approach 1:
The control unit detects operation types in advance and adjusts the power engine's rotation speed accordingly before actual operations commence. By identifying whether upcoming operations will be high-load or low-load, the system can pre-adjust the engine speed to appropriate levels, avoiding unnecessary energy consumption while ensuring sufficient power availability when needed
Solution Approach 2:
The control unit continuously monitors operation types and uses this feedback information to adjust the power engine's rotation speed. This closed-loop control ensures that the engine operates at the minimum necessary speed to perform the detected operation type, thereby eliminating wasteful energy consumption during low-load operations while maintaining sufficient power for high-load operations
Data Source
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AI summary
An excavator (100) includes a lower traveling body (1); an upper turning body (3) turnably mounted to the lower traveling body (1); an attachment (AT) that is attached to the upper turning body (3); and a power engine that is mounted to the upper turning body (3). The excavator (100) is configured such that, before a low-load operation by the attachment (AT) is started, a rotation speed of the power engine is reduced.