Working Machine Engine Speed Control via Load Feedback
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Solution Overview
Problem
Existing working machines lack efficient control mechanisms to dynamically adjust engine revolving speed based on load conditions, leading to suboptimal performance and energy consumption.
Innovation Solution
A working machine with a control device that includes a revolving-speed controller, a first setting part to set a limit value for the engine revolving speed, and a revolving-speed limiter to adjust the engine speed according to load conditions, using a hydraulic system with variable displacement pumps and electromagnetic control valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the prime mover operates at high revolving speed to maintain performance under varying loads, then the power output is improved, but energy consumption and noise increase
Solution Approach 1:
The patent applies dynamics by making the revolving speed of the prime mover variable rather than fixed. The revolving-speed controller part dynamically adjusts the revolving speed based on actual load conditions detected by the load detection means. When load is high, the speed increases to maintain power output; when load is low, the speed decreases to reduce energy consumption and noise, thus resolving the contradiction between maintaining power and reducing energy use.
Solution Approach 2:
The patent changes the operating parameter (revolving speed) of the prime mover according to load conditions. The control system modifies the revolving speed parameter dynamically - increasing it when load detection indicates high demand to maintain power output, and decreasing it when load is low to reduce energy consumption and noise, thereby resolving the technical contradiction.
2Power
If the prime mover operates at high revolving speed to maintain performance under varying loads, then the power output is improved, but noise increases
Solution Approach 1:
The revolving-speed controller dynamically adjusts the prime mover's revolving speed based on detected load conditions. When load is high and power output is needed, the speed increases; when load is low, the speed decreases, which simultaneously reduces noise generation. This dynamic adjustment resolves the contradiction between maintaining power output and reducing noise.
Solution Approach 2:
The control system changes the revolving speed parameter of the prime mover according to load detection results. By lowering the revolving speed parameter during low-load conditions, the system reduces noise generation while maintaining sufficient power output during high-load conditions, thus resolving the contradiction between power and noise.
3Device complexity
If a fixed target revolving speed is set for the prime mover, then the control system is simple, but the working machine cannot adapt to varying load conditions
Solution Approach 1:
The patent implements feedback control where the load detection means continuously monitors the actual load on the hydraulic actuator and feeds this information to the control system. The revolving-speed controller part uses this feedback to automatically adjust the prime mover's revolving speed, enabling the system to adapt to varying load conditions without requiring complex manual intervention or overly complicated control mechanisms.
Solution Approach 2:
The control system performs self-adjustment based on load detection. The revolving-speed controller automatically modifies the prime mover's operating parameters according to the detected load conditions, enabling the working machine to adapt to varying loads without external intervention. This self-service capability provides adaptability while keeping the control system relatively simple.
Data Source
AI summary
A working machine includes a prime mover, a hydraulic pump to be driven by power of the prime mover and to output operation fluid, a hydraulic actuator to be operated by the operation fluid, and a control device. The control device has a revolving-speed controller to increase and decrease a revolving speed of the prime mover, a first setting portion to set a limit value of the revolving speed of the prime mover, and a revolving-speed limiter to limit the revolving speed of the prime mover set by the revolving-speed controller to the limit value set by the first setting portion.