Excavator Hydraulic Pump Control for Fuel Efficiency
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Solution Overview
Problem
Existing methods for controlling hydraulic pumps in excavators limit the range of discharge flow rates, leading to inefficiencies in both work and fuel efficiency due to the need for inconvenient engine rpm adjustments.
Innovation Solution
A method that scans engine revolution speed and required discharge flow rate in increments of 10 rpm to achieve the maximum flow rate at which the hydraulic pump can discharge, using a formula to calculate optimal engine revolution speed for high fuel efficiency, allowing the pump to operate at a predetermined flow rate set by the operator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the discharge flow rate of the pump is set within a limited range based on maximum engine revolution speed, then the option can be operated safely, but the work efficiency and fuel efficiency deteriorate
Solution Approach 1:
The system dynamically adjusts the engine revolution speed based on the required discharge flow rate. Instead of operating at fixed maximum RPM, the controller calculates and sets the optimal engine speed that matches the hydraulic pump's flow requirements, allowing the system to adapt between safety constraints and efficiency goals.
Solution Approach 2:
The invention changes the operating parameters by scanning through different engine revolution speeds and their corresponding discharge flow rates. The controller selects the parameter combination (engine RPM and pump flow rate) that achieves the desired flow while optimizing fuel efficiency, rather than always operating at maximum rated values.
2Ease of operation
If the engine rpm is additionally set using an engine rpm command dial after setting the discharge flow rate, then the engine can be controlled, but the operation becomes inconvenient and complex
Solution Approach 1:
The controller automatically performs the engine RPM setting based on the discharge flow rate requirements. The system self-adjusts by scanning through possible engine speeds, calculating the corresponding flow rates, and selecting the optimal combination without requiring manual intervention from the operator.
Solution Approach 2:
The invention merges the discharge flow rate setting and engine RPM control into a single integrated process. Instead of requiring separate adjustments through multiple controls, the system combines these functions so that setting the desired flow rate automatically determines the appropriate engine speed.
3Reliability
If the discharge flow rate is limited by the maximum engine rpm, then the pump can operate within safe limits, but the ability to set various discharge flow rates is restricted
Solution Approach 1:
The system dynamically determines the relationship between engine speed and pump discharge flow rate. By scanning through different engine RPM values and calculating their corresponding flow rates, the system identifies the optimal operating point that satisfies both safety constraints and the operator's flow rate requirements.
Solution Approach 2:
The controller uses feedback from the hydraulic pump's actual discharge flow rate to adjust the engine revolution speed. The system continuously monitors and adjusts parameters to maintain optimal operation within safe limits while achieving the desired flow rate.
Data Source
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AI summary
The present invention relates to a method for controlling a hydraulic pump in an excavator, and more particularly, to a method for controlling a hydraulic pump in an excavator, capable of enabling optimum control of an engine and a pump, in a case of operating an excavator with options such as a breaker, a crusher, or the like, by allowing the engine to be operated at an engine revolution speed to achieve the best fuel efficiency when a hydraulic pump discharges a flow at a set flow rate predetermined by an operator through an instrument panel.