Cooling Fan Brake Control for Construction Equipment
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Solution Overview
Problem
In construction equipment, the cooling fan is often operated at overspeed when the brake is charged, leading to decreased fuel efficiency and increased noise due to the temporary high-pressure/high-flow rate supply of hydraulic oil to both the brake and cooling fan units.
Innovation Solution
A method that involves generating a brake charging signal, charging hydraulic oil at a high flow rate into the brake unit, turning off the loading valve and on the unloading valve of the cooling fan unit during this process, and reversing the valve states after a predetermined time (0.5 seconds) to prevent overspeed by unloading hydraulic oil from the cooling fan unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydraulic oil is rapidly increased to charge brake unit pressure, then brake charging speed is improved, but cooling fan operates at overspeed causing fuel efficiency deterioration and noise increase
Solution Approach 1:
The controller predicts when brake charging will be needed and pre-charges the hydraulic oil pressure in advance. This preliminary action ensures that when brake charging is actually required, the high-pressure oil is already available, eliminating the need to rapidly increase pump output and avoid cooling fan overspeed.
Solution Approach 2:
The system dynamically adjusts the pump's hydraulic oil discharge flow rate based on real-time operating conditions. The controller continuously monitors brake pressure, cooling fan speed, and other parameters to optimize the balance between brake charging speed and cooling fan operation, preventing energy loss while maintaining productivity.
2Productivity
If hydraulic oil discharge flow rate is rapidly increased for brake charging, then brake charging efficiency is improved, but cooling fan speed increases excessively causing noise increase
Solution Approach 1:
The controller predicts brake charging requirements and pre-charges hydraulic oil pressure, ensuring high-pressure oil is available before actual brake charging begins. This eliminates the need for rapid flow rate increases that cause cooling fan overspeed and noise.
Solution Approach 2:
The system continuously monitors cooling fan speed, brake pressure, and pump output, using this feedback to dynamically adjust the hydraulic oil discharge flow rate. This closed-loop control prevents excessive fan speed and noise while maintaining brake charging efficiency.
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
This method effectively reduces the revolutions per minute of the cooling fan, preventing overspeed and thereby improving fuel efficiency and reducing noise by controlling the hydraulic oil supply during brake charging.
Implementation Method 1
the hydraulic oil discharged from the pump 5 may rotate the cooling fan of the cooling fan unit 3 through the main control valve 7, thereby cooling the engine or the hydraulic oil
Implementation Method 2
the hydraulic oil discharged from one pump is primarily supplied to the brake unit by a main control value to accumulate a predetermined pressure in the brake unit
Data Source
AI summary
The present disclosure provides a method for controlling a cooling fan-brake of construction equipment, including: generating a brake charging signal of a brake unit; charging hydraulic oil with a high flow rate in the brake unit and completing the charging of hydraulic oil; turning a loading valve of a cooling fan unit off and turning an unloading valve of the cooling fan unit on when the hydraulic oil is charged; and turning the loading valve of the cooling fan unit on and turning the unloading valve of the cooling fan unit off after the charging of hydraulic oil is completed and a predetermined time elapses.