Hydraulic Pump Pressure Control for Exhaust Gas Heating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional hydraulic drive systems for hydraulic working machines fail to control engine load minimally to raise exhaust gas temperature for effective combustion of particulate matter, leading to inefficiencies in energy saving and particulate matter elimination.
Innovation Solution
A hydraulic drive system with a pressure detection and control mechanism, including a variable restrictor, that adjusts delivery pressure to a preset value to minimize engine load and ensure sufficient exhaust gas temperature for particulate matter combustion, using a control system that manages the actuator control valve, displacement, and delivery pressure to optimize engine output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the delivery pressure of the variable displacement hydraulic pump is increased to raise exhaust gas temperature for particulate matter combustion, then the temperature of exhaust gas is improved, but the engine output is wasted due to manufacturing errors causing actual delivery pressure to exceed preset values
Solution Approach 1:
The patent implements a feedback control mechanism where a pressure detection means continuously monitors the actual delivery pressure of the hydraulic pump, and a control means adjusts the delivery pressure based on the detected value to maintain it at the preset minimum level required for particulate matter combustion, preventing energy waste from excessive pressure
Solution Approach 2:
The patent dynamically adjusts the delivery pressure parameter of the hydraulic pump based on detected actual pressure values, changing it to match the preset minimum required value, thereby optimizing the balance between achieving sufficient exhaust gas temperature and minimizing engine output waste
2Loss of energy
If the delivery pressure is set to a preset value to minimize engine load, then energy saving is improved, but the actual delivery pressure may become insufficient due to manufacturing errors leading to inadequate particulate matter elimination
Solution Approach 1:
The pressure detection means provides continuous feedback on actual delivery pressure, enabling the control means to detect when pressure falls below the preset minimum value and automatically adjust it upward, ensuring reliable particulate matter combustion while maintaining energy efficiency
Solution Approach 2:
The system dynamically adjusts the delivery pressure parameter upward from the preset minimum value when detection indicates insufficiency, ensuring the pressure remains at the optimal level for both energy saving and reliable particulate matter elimination
3Loss of energy
If the engine output is reduced to the minimum level for cooling and lubrication in non-operation state, then energy saving is improved, but the exhaust gas temperature drops making particulate matter combustion difficult
Solution Approach 1:
The patent applies hydraulic load to the engine through the variable displacement hydraulic pump operating in non-feed state, using the hydraulic system to generate the necessary load that raises exhaust gas temperature to the level required for particulate matter combustion while maintaining relatively low engine output
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 allows precise control of delivery pressure to achieve the necessary exhaust gas temperature for particulate matter combustion, reducing fuel consumption and contributing to energy saving by minimizing engine load while preventing filter clogging.
Implementation Method 1
a variable restrictor (19) arranged on an upstream side of the actuator control valve (7) in a direction of a flow of pressure oil delivered from the variable displacement hydraulic pump (4), and adapted to restrict the flow of pressure oil delivered from the variable displacement hydraulic pump (4)
Implementation Method 2
an exhaust gas purification system for trapping in a filter particulate matter in exhaust gas as produced by incomplete combustion in the engine
Implementation Method 3
an engine output is increased to provide the exhaust gas with heat needed for combustion of the particulate matter so that the particulate matter in the filter of the exhaust gas purification system is combusted and eliminated
Implementation Method 4
a variable displacement hydraulic pump drivable by power transmitted from the engine
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Provided is a hydraulic drive system for a hydraulic working machine, which can surely set a delivery pressure at a preset value upon raising a temperature of exhaust gas to a temperature needed for combustion of particulate matter by increasing a load to be applied to an engine. In a non-operation state of the hydraulic working machine, a variable restrictor (19) is controlled by a controller (14) and a delivery pressure control valve (20) to increase a delivery pressure of a variable displacement hydraulic pump (4), so that the load to be applied to the engine is increased to raise the temperature of exhaust gas to the temperature needed for the combustion of the particulate matter. At this time, a controller (14) controls the delivery pressure control valve (20) such that a delivery pressure to be detected by a delivery pressure sensor (21) will conform with a preset reference delivery pressure. The reference delivery pressure has been set as a minimum pressure that can provide the exhaust gas with heat needed for the combustion of the particulate mater.