Exhaust treatment method and apparatus having particulate filters and scr
US-2024159174-A1 · May 16, 2024 · US
Construction machine hydraulic drive system having exhaust gas purifying device
US9080481B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9080481-B2 |
| Application number | US-201214237357-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 2, 2012 |
| Priority date | Oct 4, 2011 |
| Publication date | Jul 14, 2015 |
| Grant date | Jul 14, 2015 |
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- Title
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Abstract
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A construction machine hydraulic drive system that performs load sensing control is capable of efficiently burning and removing deposits on a filter in an exhaust gas purifying device through pump output increasing control and to be free from faults in the pump output increasing control even when an actuator is operated during the pump output increasing control. A solenoid switching valve is switched so that output pressure of an engine speed detecting valve is guided to a pressure receiving portion of an LS control valve and a pressure receiving portion of an unloading valve when a start of regeneration is not directed, and delivery pressure of a pilot pump is guided to the pressure receiving portion and the pressure receiving portion when the start of the regeneration is directed, to thereby disable load sensing control to increase capacity of a main pump and increase set pressure of the unloading valve.
First claim
Opening claim text (preview).
The invention claimed is: 1. A construction machine hydraulic drive system comprising: an engine; a variable displacement hydraulic pump driven by the engine; a plurality of actuators driven by hydraulic fluid delivered from the hydraulic pump; a plurality of flow and directional control valves that control a flow rate of the hydraulic fluid supplied from the hydraulic pump to the actuators; a pump control device including: a torque control section that performs absorption…
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Mechanical Engineering · mapped topic
Fixed Constructions · mapped topic
Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
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Frequently asked questions
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- What does patent US9080481B2 cover?
- A construction machine hydraulic drive system that performs load sensing control is capable of efficiently burning and removing deposits on a filter in an exhaust gas purifying device through pump output increasing control and to be free from faults in the pump output increasing control even when an actuator is operated during the pump output increasing control. A solenoid switching valve is sw…
- Who is the assignee on this patent?
- Hitachi Construction Machinery
- What technology area does this patent fall under?
- Primary CPC classification F01N3/023. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Jul 14 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).