Exhaust Purification Control for Construction Machines
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Solution Overview
Problem
Construction machines equipped with exhaust gas purification devices face operability issues when simultaneously performing crane operations and regenerating operations, leading to reduced chances of purifying the devices and potential clogging, while prohibiting crane operations during regeneration worsens the machine's usability.
Innovation Solution
An exhaust gas purification control device that includes an engine, actuator, operation detection unit, purification device, accumulation amount detection unit, and a regeneration control unit, which prioritizes the regenerating operation stepwise as soot accumulation increases, allowing simultaneous crane and regenerating operations by managing engine load and operation priorities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the regenerating operation is performed only when the operation lever is in a neutral position, then the engine load can be increased to burn soot, but the chance of regenerating the purification device is reduced as crane operation time becomes longer
Solution Approach 1:
The control system dynamically adjusts the regenerating operation priority based on soot accumulation amount. When soot accumulation is below the threshold, crane operations are prioritized. When soot accumulation exceeds the threshold, the system automatically initiates regenerating operations by increasing engine load, transitioning from a static neutral-position-only approach to a dynamic threshold-based control strategy that adapts to actual purification device conditions.
Solution Approach 2:
The invention changes the control parameter from a binary state (neutral position only) to a continuous parameter (soot accumulation amount threshold). By monitoring soot accumulation and comparing it against a predetermined threshold, the system determines when to prioritize regeneration over crane operations, enabling more frequent and timely regeneration opportunities while preventing soot clogging.
2Reliability
If the crane operation is forcibly prohibited during the regenerating operation, then the purification device can be regenerated, but the operability of the construction machine is deteriorated
Solution Approach 1:
Instead of completely prohibiting crane operations during regeneration, the system applies partial action by allowing crane operations to continue when soot accumulation is below the threshold. The regenerating operation is initiated only when necessary (when soot exceeds threshold), avoiding excessive restriction of crane operations while still achieving sufficient regeneration to prevent clogging.
Solution Approach 2:
The invention changes the control approach from a binary prohibition (crane operation completely stopped during regeneration) to a threshold-based priority system. By comparing soot accumulation against a predetermined threshold, the system intelligently decides whether to prioritize crane operations or initiate regeneration, maintaining construction machine operability while ensuring purification device functionality.
3Reliability
If the regenerating operation is performed frequently, then soot clogging is prevented, but the engine load increases and affects crane operation performance
Solution Approach 1:
The invention changes the regeneration trigger from frequent time-based or position-based operations to a threshold-based approach using soot accumulation amount. By monitoring soot accumulation and comparing it against a predetermined threshold, the system initiates regeneration only when necessary, balancing purification device functionality with engine power availability for crane operations.
Solution Approach 2:
The system applies partial regeneration action by allowing crane operations to continue uninterrupted when soot accumulation is below the threshold. Regeneration is initiated only when soot accumulation reaches the threshold level, avoiding excessive engine load application while still preventing soot clogging that would occur with less frequent regeneration.
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
Ensures the operability of construction machines and increases the chances of regenerating the purification device, preventing clogging while allowing simultaneous crane and regenerating operations, thus improving machine usability.
Implementation Method 1
a regenerating operation, which is an operation of regenerating the purification device by burning the soot captured by the purification device
Data Source
AI summary
An exhaust gas purification control device includes an engine, an actuator using the engine as a driving source, an operation unit used by an operator to operate the actuator or the engine, an operation detector detecting whether or not the operation unit is being operated, a purification device for capturing soot in exhaust gas of the engine, an accumulation amount detector detecting an accumulation amount of the soot captured by the purification device, a regeneration unit for performing an regenerating operation of regenerating the purification device by burning the soot captured by the purification device, and a controller controlling the regenerating operation. The controller switches a control from a control of prioritizing an operation by the operation unit to a control of prioritizing the regenerating operation in a stepwise manner as the accumulation amount of the soot detected by the accumulation amount detector increases.