Construction Machine Engine Control for Fuel Efficiency
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Solution Overview
Problem
Construction machines face challenges in optimizing engine RPM for improved fuel efficiency while maintaining user convenience, particularly when auxiliary power devices are integrated, as existing control systems struggle to adjust engine speed based on electrical energy consumption.
Innovation Solution
A control device and method that subdivides engine RPM into specific ranges (first, second, and third RPM) and corresponding power ranges for the auxiliary power device, allowing the engine control unit to adjust RPM based on the load and auxiliary power availability, ensuring efficient power generation and consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If engine RPM is decreased to improve fuel efficiency, then fuel consumption is reduced, but electrical energy generation capability deteriorates
Solution Approach 1:
The control device changes engine operating parameters (RPM and load) based on the operational state of auxiliary power devices. When auxiliary power is available, the engine operates at lower RPM with reduced load to minimize fuel consumption. The control unit dynamically adjusts these parameters to maintain electrical energy generation capability while optimizing fuel efficiency.
2Ease of operation
If engine RPM is maintained at predetermined level to ensure user convenience, then electrical energy generation is sufficient, but fuel efficiency deteriorates
Solution Approach 1:
The control device dynamically adjusts engine RPM based on real-time detection of auxiliary power device operation and electrical energy storage state. Instead of maintaining a fixed predetermined RPM, the system adapts the engine speed to current conditions, lowering it when auxiliary power is available and electrical energy is sufficient, thereby improving fuel efficiency while ensuring user convenience is maintained when needed.
3Power
If auxiliary power device is added to construction machine, then power generation capability is improved, but control complexity increases
Solution Approach 1:
The control device implements a feedback mechanism that continuously monitors the operational state of auxiliary power devices and the charge level of electrical energy storage. Based on this feedback, the control unit automatically adjusts engine RPM and load parameters. This feedback-based control manages the complexity by using sensor data and automated decision logic rather than requiring complex mechanical control systems.
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 effectively decreases engine RPM when auxiliary power is received, improving fuel efficiency by determining the need for alternator operation and adjusting engine speed accordingly, thereby optimizing energy use and reducing fuel consumption.
Implementation Method 1
Electrical energy is generated by operating an alternator by means of the power of an engine
Data Source
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AI summary
The present invention relates to a control device and control method for a construction machine. A control device and control method for a construction machine according to the embodiments of the present invention can determine a need for the operation of the alternator by taking into account required electrical energy and the current charge amount of a battery when auxiliary power is received from the auxiliary power device, and can thus decrease an engine RPM in a situation in which power generation is not required, thereby improving the fuel efficiency of a construction machine.