Hydraulic Excavator Pump Control for Faster Engine Load Response
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Solution Overview
Problem
Hydraulic excavators face inefficiencies in working efficiency when suddenly loaded in a low load state and produce black smoke when suddenly loaded in an idle state due to engine hysteresis and mechanical transmission delays.
Innovation Solution
A hydraulic excavator control system and method that adjusts engine fuel injection ahead of main pump power adjustment by 0.05-0.6 seconds based on oil circuit pressure signals, using a controller and engine ECM to optimize power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the engine is suddenly loaded in a low load state, then the loading time becomes excessively long, but working efficiency is reduced
Solution Approach 1:
The controller predicts future main pump power requirements based on current hydraulic system state and operating parameters, then pre-adjusts engine fuel injection amount before the actual load change occurs. This preliminary action eliminates the hysteresis delay in engine response, reducing loading time from seconds to milliseconds while maintaining high working efficiency.
Solution Approach 2:
The system continuously monitors hydraulic system pressure, flow rate, and engine operating parameters, feeding this information back to the controller which dynamically adjusts fuel injection in real-time. This closed-loop feedback ensures the engine responds precisely to actual and predicted load requirements, optimizing both response time and working efficiency.
2Object-affected harmful factors
If the engine is suddenly loaded in an idle state, then black smoke occurs, but energy consumption increases
Solution Approach 1:
When the controller detects an idle state condition, it pre-increases the fuel injection amount before sudden loading occurs. This preliminary fuel preparation ensures complete combustion under sudden load conditions, preventing black smoke generation without requiring excessive idle speed increases that would waste energy.
Solution Approach 2:
The system dynamically changes the fuel injection parameter based on predicted load conditions and actual operating state. By optimizing the fuel-air mixture ratio in real-time, the system achieves complete combustion that eliminates black smoke while maintaining energy-efficient operation at various load levels.
Data Source
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AI summary
The present invention discloses a hydraulic excavator control system and method. The method includes: collecting, by a controller, an oil path pressure signal of a hydraulic excavator, and calculating a required main pump power according to the oil path pressure signal; sending, by the controller, the required main pump power to an engine ECM; and first adjusting, by the engine ECM, an engine oil injection quantity according to the required main pump power, and then adjusting, by the controller, a main pump power according to the required main pump power. The present invention greatly reduces the loading response time of the engine, improves the working efficiency of the whole machine, avoids the problem of black smoke from idle loading, and can further reduce an idle rotation speed of the engine and reduce fuel oil consumption.