Hydraulic Excavator Engine Speed Control for Revolving Torque
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Solution Overview
Problem
Conventional engine speed control devices for construction machines require manual operator intervention to address insufficient revolving speed, leading to inconsistent fuel economy improvements.
Innovation Solution
A hydraulic excavator with an engine, hydraulic pump, revolving motor, and operation amount detection unit, where the control unit automatically increases maximum engine speed when the operation amount of the revolving operation lever exceeds a predetermined threshold, optimizing engine torque curves and modes to enhance fuel economy and ensure sufficient revolving speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If manual operator intervention is used to increase engine speed when revolving speed is insufficient, then the revolving speed problem can be solved, but fuel economy improvement becomes inconsistent and operator experience varies
Solution Approach 1:
The control unit pre-establishes the relationship between operation lever operation amount and engine speed control. When the operation amount exceeds the threshold, the control unit automatically executes engine speed increase without waiting for manual intervention, thereby preliminarily preparing the system response to ensure both sufficient revolving speed and consistent fuel economy management
Solution Approach 2:
The control unit continuously monitors the operation amount of the revolving operation lever and uses this feedback to automatically adjust engine speed. This closed-loop feedback mechanism ensures that engine speed is increased only when actually needed (when operation amount exceeds threshold), eliminating unnecessary fuel consumption while guaranteeing sufficient revolving speed when required
2Loss of energy
If manual operation of fuel amount increase switch is required, then fuel economy can be enhanced, but operator convenience deteriorates and operation becomes annoying
Solution Approach 1:
The control unit autonomously manages engine speed control based on operation lever position detection, eliminating the need for manual fuel amount increase switch operation. The system serves itself by automatically detecting when engine speed increase is needed and executing the control without operator intervention, thereby maintaining fuel economy while significantly improving operator convenience
Solution Approach 2:
The manual mechanical operation of the fuel amount increase switch is replaced by an automatic electronic control system. The control unit uses electronic sensors to detect operation lever position and electronically controls the fuel injection amount, substituting the manual mechanical system with an automated electronic system that improves both fuel economy consistency and operator convenience
3Speed
If engine speed is increased to ensure sufficient revolving speed, then revolving performance is improved, but fuel consumption increases
Solution Approach 1:
The control unit dynamically adjusts engine speed based on real-time operation lever position. Engine speed is increased only when the operation amount exceeds the predetermined threshold, and maintained at appropriate levels during actual revolving operations. This dynamic adjustment ensures sufficient revolving speed when needed while minimizing fuel consumption during idle or low-demand periods
Solution Approach 2:
The control unit changes the engine operating parameters (speed and fuel injection amount) based on the detected operation lever position. By adjusting these parameters dynamically according to actual operational needs, the system ensures sufficient revolving speed when the lever is operated significantly while reducing fuel consumption when full power is not required
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution automatically maintains sufficient revolving speed and enhances fuel economy by increasing engine speed only when needed, reducing operator annoyance and variability in fuel efficiency.
Implementation Method 1
a hydraulic pump 24 driven by the engine 6; a revolving motor 26 which revolves the upper structure 3 by means of hydraulic oil to be supplied from the hydraulic pump 24
Implementation Method 2
a revolving motor 26 which revolves the upper structure 3 by means of hydraulic oil to be supplied from the hydraulic pump 24
Data Source
AI summary
An engine control device is adapted to be used for a construction machine equipped with an engine, a hydraulic pump to be driven by the engine, a revolving motor for revolving an upper structure by means of hydraulic oil to be supplied from the hydraulic pump, and a revolving operation lever for executing an operation of revolving the upper structure. The engine control device includes an operation amount detection unit configured to detect an operation amount of the revolving operation lever, and a control unit configured to increase a maximum engine speed when a result of detection by the operation amount detection unit is greater than a predetermined threshold.