Working Machine Speed Coordination for Engine and Hydraulic Actuators
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Solution Overview
Problem
Existing working machines face challenges in setting appropriate engine revolving speeds and hydraulic actuator operation speeds, making it difficult for both trained and untrained operators, as current control methods prioritize machine speed over operator skill levels.
Innovation Solution
A working machine configuration that includes a first setting member for selecting the revolving speed of the prime mover and a second setting member for selecting the operation speed of the hydraulic actuator, allowing for customizable speed settings based on the operator's skill level and environment, using a control system with electronic/electric circuits and computer programs to adjust the engine and hydraulic pump operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the engine revolving speed is controlled based on the first control characteristic line that prioritizes working machine speed, then the operation can be carried out efficiently, but the operation becomes difficult for operators who are not trained to operate the working machine
Solution Approach 1:
The control system dynamically switches between multiple control characteristic lines (first, second, and third) based on the detected traveling load. When the traveling load is large, it uses the first control characteristic line optimized for working machine speed and operation efficiency. When the traveling load is small, it switches to the second or third control characteristic lines optimized for fuel saving. This dynamic adaptation allows the system to maintain high operation efficiency when needed while reducing complexity and improving ease of operation under different conditions.
Solution Approach 2:
The system changes the control parameters (engine revolving speed characteristics) based on the traveling load condition. By detecting the traveling load and selecting appropriate control characteristic lines, the system adjusts the relationship between accelerator pedal operation extent and engine revolving speed. This parameter change enables the system to optimize for either operation efficiency or fuel saving depending on conditions, making the machine easier to operate across different scenarios.
2Productivity
If the working machine speed is determined suitable for the operator who is trained well to operate the working machine, then the operation can be carried out efficiently, but the operator who is trained well to operated the working machine feels uncomfortable when the speed is determined suitable for the operator who is not trained
Solution Approach 1:
The control system is designed to serve multiple operator skill levels and multiple operating conditions through its multi-mode control architecture. It can function in operation-efficient mode (first control characteristic line) for trained operators and in fuel-saving mode (second or third control characteristic lines) for other scenarios. The traveling load detection mechanism enables the system to automatically adapt to different conditions, making it universally applicable to both trained and untrained operators while maintaining comfort and efficiency.
3Loss of energy
If the control device uses multiple control characteristic lines for different traveling loads, then the fuel saving can be improved, but the device complexity increases
Solution Approach 1:
The control system automatically detects the traveling load condition and self-selects the appropriate control characteristic line without requiring manual intervention from the operator. The traveling load detection device continuously monitors the condition, and the control device automatically switches between the first, second, and third control characteristic lines based on whether the traveling load is large or small. This self-service mechanism simplifies the user interface while maintaining the benefits of multiple control modes, effectively managing the complexity internally while preserving fuel saving advantages.
Data Source
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AI summary
To provide a working machine configured to appropriately set and determine a revolving speed of a prime mover and an operation speed of a hydraulic actuator. A working machine includes a prime mover, a hydraulic pump to be driven by power of the prime mover to output operation fluid, a hydraulic actuator to be actuated by the operation fluid outputted from the hydraulic pump, a first setting member to accept selection of a set revolving speed of the prime mover, a second setting member to accept selection of a set speed of the hydraulic actuator, a revolving speed controller portion to control operation of the prime mover based on the set revolving speed, and a speed controller portion to control operation of the hydraulic actuator based on the set speed. The speed controller portion being configured to change an operation speed of the hydraulic actuator in accordance with the set revolving speed accepted by the first setting member, the operation speed of the hydraulic actuator corresponding to the set speed accepted by the second setting member.