Construction Machinery Engine RPM Control via Air Filter Monitoring
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Solution Overview
Problem
Construction machines' engines are prone to wear and damage due to dust accumulation in air filters, as existing systems fail to effectively monitor and manage engine RPM when filters become clogged, leading to missed replacement times and subsequent engine deterioration.
Innovation Solution
A method and apparatus that continuously accumulate engine operating time even after a clogging signal is generated, and compulsorily decrease engine RPM to a predetermined level if the air filter is not replaced within a set time, with additional RPM reductions if the filter remains unreplaced, accompanied by notifications to the operator through an instrument cluster electronic control unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the air filter clogging warning is provided to the operator, then the operator is notified of the filter replacement time, but the engine operating time is not continuously monitored and may be erased when engine start is stopped, leading to missed replacement times
Solution Approach 1:
The system continuously accumulates engine operating time in advance and stores it in memory before any potential engine shutdown occurs. This preliminary action ensures that the operating time data is preserved and not lost when the engine is stopped or restarted, enabling reliable tracking of filter replacement intervals.
Solution Approach 2:
The system provides continuous feedback to the operator through warning signals when the accumulated engine operating time reaches the filter replacement threshold. The feedback mechanism includes notifying the operator of the filter replacement time and maintaining continuous monitoring to prevent missed replacements, creating a closed-loop system that ensures timely filter maintenance.
2Productivity
If the engine RPM is increased to improve work performance, then productivity increases, but dust may get out of the clogged filter and be sucked into the engine causing wear and damage
Solution Approach 1:
The system applies preliminary anti-action by compulsorily decreasing the engine RPM when the air filter is determined to be clogged. This preventive measure stops the harmful process of dust being sucked into the engine before it can cause wear and damage. The system prioritizes engine protection over work performance when filter clogging is detected.
Solution Approach 2:
The system converts the harmful effect of reduced engine performance due to RPM limitation into a benefit by using it as a protective mechanism. The compulsory RPM decrease, while reducing productivity, serves as a beneficial safeguard that prevents much greater harm to the engine from dust ingestion, ultimately protecting the engine's longevity and performance.
3Duration of action of moving object
If the air filter is not replaced timely due to operator carelessness, then the machine can continue operating, but dust accumulated in the filter may get out and damage engine components
Solution Approach 1:
The system implements continuous feedback monitoring of engine operating time and filter condition. When the filter replacement time is reached or exceeded, the system provides warning signals to the operator and, if unreplaced, compulsorily decreases engine RPM. This feedback loop ensures that continuous operation does not compromise engine reliability by preventing dust leakage into the engine.
Solution Approach 2:
The system performs self-service by automatically monitoring its own operating conditions and enforcing filter replacement requirements. The electronic control unit continuously tracks engine operating time, determines when filter replacement is needed, and automatically implements RPM limitation if the filter is not replaced, without requiring constant operator intervention or manual monitoring.
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 solution ensures that engine components are protected by interfering with the machine's operation if the air filter is not replaced, guiding the operator to address the issue and preventing engine wear or damage.
Implementation Method 1
an air filter clogging switch sensing pressure of the air sucked into the engine combustion chamber through the air filter
Data Source
Figure 1
Figure 2~3
AI summary
An apparatus and a method for controlling engine RPM (Revolutions Per Minute) for a construction machine are disclosed, which can compulsorily decrease the engine RPM when an air filter clogging signal is generated. The method for controlling engine RPM for a construction machine including an engine, an air filter, an air filter clogging switch, an engine electronic control unit (E-ECU), and a vehicle electronic control unit (V-ECU), includes determining whether the air filter is clogged in accordance with a signal from the air filter clogging switch, continuously accumulating an engine operating time without initializing the engine operating time even if an engine start is turned off after the air filter clogging signal is generated, determining whether the air filter is repaired or replaced if the accumulated engine operating time exceeds a predetermined time after the air filter clogging signal is generated, applying a control signal from the V-ECU to the E-ECU to compulsorily decrease the engine RPM to predetermined RPM if the air filter is not repaired or replaced in a state where the accumulated engine operating time exceeds the predetermined time, and decreasing the engine RPM to the predetermined RPM in accordance with the control signal that is applied from the E-ECU to an engine driving unit.