Excavator Engine Speed Limiting for Safer Variable-Power Work
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Solution Overview
Problem
Existing excavator technologies fail to appropriately adjust the motor rotation rate based on the operator's skills and work content, leading to potential inefficiencies and safety issues.
Innovation Solution
An excavator system with a motor, a first input part for adjusting the rotation rate, and a restricting part that maintains the rotation rate within predetermined limits, ensuring it does not exceed an upper limit or fall below a lower limit, even when the operator inputs changes beyond these limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the rotation rate of the motor is restricted to prevent fuel inefficiency and operational safety issues, then fuel efficiency and safety are improved, but the operator's ability to perform high-power work is limited
Solution Approach 1:
The patent implements dynamic rotation rate restriction by switching between different restriction levels based on operating conditions. The control unit determines whether to apply first or second rotation rate restriction based on factors like attachment type and work content, allowing the system to adapt between fuel efficiency mode and high-power work mode dynamically
Solution Approach 2:
The system changes the rotation rate parameter dynamically based on operating conditions. By detecting work content and attachment information, the control unit adjusts the rotation rate upper limit between two different restriction levels, enabling the motor to operate at lower rates for fuel efficiency and higher rates when high-power work is required
2Reliability
If the rotation rate of the motor is restricted to prevent load sway and soil collapse, then operational safety is improved, but work efficiency under light load is reduced
Solution Approach 1:
The system dynamically adjusts rotation rate restrictions based on real-time operating conditions. When light load work is detected, the system applies appropriate restriction levels that maintain safety while allowing sufficient rotation rate for efficient operation, rather than applying fixed maximum restrictions
Solution Approach 2:
The control unit continuously monitors operating conditions including work content and attachment type, using this feedback to determine the appropriate rotation rate restriction level. This closed-loop control ensures that safety restrictions are applied appropriately without unnecessarily limiting work efficiency
3Reliability
If the rotation rate of the motor is automatically restricted for poorly skilled operators, then operational safety is improved, but the operator's control flexibility is reduced
Solution Approach 1:
The system provides dynamic control by allowing different rotation rate restriction levels based on detected work content. Skilled operators can utilize the second restriction level that allows higher rotation rates when needed, while the system automatically applies appropriate restrictions for safety, maintaining both safety and operational flexibility
Data Source
AI summary
A technique that can suitably restrict a rotation rate of a motor of an excavator is provided. An excavator according to an embodiment of the present disclosure includes an engine, an engine rotation rate adjusting dial that receives an input regarding changing of the rotation rate of the engine, and an engine control part that restricts the rotation rate of the engine. When the rotation rate of the engine is restricted to lower than or equal to a predetermined upper limit by the engine control part, the rotation rate of the engine is maintained to lower than or equal to the predetermined upper limit even when the engine rotation rate adjusting dial receives an input that makes the rotation rate of the engine higher than the predetermined upper limit.