Construction Machine Actuator Control During DPF Regeneration
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Solution Overview
Problem
Construction machines equipped with exhaust gas purifying devices face issues where the actuator is suddenly activated during diesel particulate filter (DPF) regeneration, leading to incomplete regeneration and wastage of time, as existing solutions either prevent manual control of the actuator during regeneration or result in sudden actuator activation.
Innovation Solution
A construction machine with a manipulation-state detection system that prohibits loading level changes during manual operation and switches the command changing regulation mode to permit changes only when the loading level is constant, ensuring the actuator remains inactive during transient loading changes and allowing manual control during stable loading conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the actuator control valve is disabled during DPF regeneration to prevent sudden actuator activation, then actuator safety is improved, but the user cannot perform work using the actuator during regeneration, resulting in time waste
Solution Approach 1:
The control valve transitions from a static disabled state to a dynamic controlled state. The valve is disabled only during transient loading changes (when dL/dt > threshold) and enabled during stable loading conditions (when dL/dt ≤ threshold), allowing the system to adapt its control characteristics based on real-time operating conditions.
Solution Approach 2:
The invention changes the control parameter from a binary enabled/disabled state to a continuous state based on loading rate. By monitoring the rate of loading change (dL/dt) and comparing it to a predetermined threshold, the system dynamically adjusts the valve control state, permitting operation during stable conditions while preventing sudden activation during transient changes.
2Productivity
If manual control of the actuator is permitted during DPF regeneration, then user productivity is improved, but the actuator is likely to be activated suddenly, compromising safety
Solution Approach 1:
The system continuously monitors the loading condition (L) and calculates the rate of change (dL/dt). This feedback mechanism allows the control system to detect transient loading changes and respond by disabling the actuator control valve, thereby preventing sudden actuator activation while permitting controlled operation during stable loading conditions.
Solution Approach 2:
The invention introduces an intermediate control mechanism (the control valve with dynamic enabling/disabling) between the user input and the actuator. This intermediary filters out dangerous transient conditions while allowing legitimate operational commands to pass through, reconciling the conflicting requirements of safety and productivity.
3Reliability
If the DPF regeneration is cancelled when manipulation lever is manipulated during regeneration, then actuator safety is improved, but the regeneration fails to be accomplished, resulting in time loss
Solution Approach 1:
The invention segments the regeneration period into distinct phases: safe operation periods (when dL/dt ≤ threshold) and restricted periods (when dL/dt > threshold). This segmentation allows the system to permit actuator operation during safe phases while maintaining protection during high-risk transient phases, eliminating the need to cancel the entire regeneration process.
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 prevents unexpected actuator operation during DPF regeneration, reducing waiting time and ensuring safe and complete regeneration processes by maintaining the actuator in a neutral state during loading level changes and allowing operation when the loading level is stable.
Implementation Method 1
a DPF (Diesel Particulate Filter) which is an exhaust gas filter for trapping particulate matter, i.e., soot, contained in diesel exhaust gas
Implementation Method 2
The burning of the particulate matter is induced by loading an engine (imposing a certain load on an engine) to raise an exhaust temperature (exhaust gas temperature) of the engine
Implementation Method 3
a pump configured to be driven by an engine, an actuator to which hydraulic oil is supplied from the pump
Data Source
AI summary
Disclosed is a construction machine which comprises: a command changing regulation section; a loading device for imposing, on an engine, a load for raising an exhaust temperature of the engine up to a value at which particulate matter accumulated in a filter is burnt; and an instruction section for instructing the loading device to perform an operation for loading the engine. The instruction section prohibits the loading device from changing a loading level on the engine, during a period where a manipulation-state detection section detects a presence of a manipulation of a manipulation section. The command changing regulation section is set to a changing permission mode for permitting a value of a command which is to be assigned to an actuator control valve, to be changed according to changing a value of a command to be output from a manipulation device, during a period where the loading level is constant.