Work Machine Engine Room Cooling During Filter Regeneration
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Solution Overview
Problem
Existing work machines face excessive temperature rises within the engine room due to the regeneration of dust collecting filters, which can negatively affect electric equipment, and existing solutions do not adequately address this issue.
Innovation Solution
A control method that adjusts the rotation speed of the engine and fan, decreases the amount of working oil discharged from the hydraulic pump, and increases the engine's rotation speed during filter regeneration, thereby managing temperature within the engine room.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dust collecting filter is regenerated by temperature rise of exhaust gas, then the collected particulates are burned and the filter is purified, but the temperature rise inside the engine room causes negative effects on electric equipment
Solution Approach 1:
The control unit changes operational parameters (engine rotation number, fan rotation number, working oil discharge amount) dynamically during filter regeneration to control temperature rise. By adjusting these parameters, the system achieves filter purification while preventing excessive temperature increase that would harm electric equipment.
Solution Approach 2:
The control unit monitors temperature and other parameters during filter regeneration and adjusts the engine and fan rotation numbers accordingly. This feedback mechanism ensures that temperature rise remains within safe limits for electric equipment while still achieving effective filter regeneration.
2Temperature
If the rotation number of the engine is increased to improve cooling effect, then the fan takes in more outside air, but the amount of working oil discharged from the hydraulic pump decreases
Solution Approach 1:
The system dynamically adjusts the engine rotation number based on operational conditions. During filter regeneration, the engine rotation number is increased to enhance cooling, while the control unit simultaneously manages the hydraulic pump discharge to maintain adequate working oil supply despite the speed change.
Solution Approach 2:
The control unit changes multiple parameters simultaneously - increasing engine rotation number for cooling while adjusting fan rotation number and working oil discharge amount to maintain system balance. This coordinated parameter adjustment resolves the contradiction between cooling effect and working oil supply.
3Temperature
If the amount of working oil discharged from the hydraulic pump is decreased to suppress temperature rise, then heat generation of the working oil is reduced, but the productivity of the work machine decreases
Solution Approach 1:
The system implements periodic control during filter regeneration, alternating between periods of reduced working oil discharge to control temperature and periods of normal discharge to maintain productivity. The control unit manages these periodic changes to minimize overall impact on work machine productivity while achieving temperature control.
Solution Approach 2:
The control unit dynamically adjusts the working oil discharge amount based on real-time temperature monitoring and operational conditions. By changing this parameter flexibly rather than continuously reducing it, the system suppresses temperature rise during critical regeneration periods while maintaining productivity during normal operation.
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 approach effectively suppresses excessive temperature rises inside the engine room, protecting electric equipment and maintaining the operational efficiency of work machines during high-temperature conditions.
Implementation Method 1
a rotation number of a fan that takes outside air into an engine room accommodating an engine varies with a rotation number of the engine
Implementation Method 2
The dust collecting filter is regenerated by burning the collected particulates by a periodic temperature rise of the exhaust gas
Implementation Method 3
the work machine reduces the amount of the working oil supplied by decreasing an inclination angle of a hydraulic pump
Data Source
AI summary
A control method of a work machine in which a rotation number of a fan that takes outside air into an engine room accommodating an engine varies with a rotation number of the engine, includes: executing first control of regenerating a collecting filter unit that collects particulates contained in exhaust gas of the engine by a temperature rise of the exhaust gas; when the work machine is changed from a steady state to a specific state, executing second control of decreasing an amount of working oil discharged from a hydraulic pump by driving of the engine; and, when the first control and the second control are concurrently executed, executing third control of increasing the rotation number of the engine.