Control system for hydraulic system and method for recovering energy and leveling hydraulic system loads
US-9765501-B2 · Sep 19, 2017 · US
Hydraulic drive system for construction machine
US9200431B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9200431-B2 |
| Application number | US-201113641571-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 9, 2011 |
| Priority date | May 24, 2010 |
| Publication date | Dec 1, 2015 |
| Grant date | Dec 1, 2015 |
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Abstract
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A hydraulic drive system for a construction machine has a travel detection device which detects whether or not the operation mode is a traveling operation and a setting changing device. The setting changing device sets the target differential pressure of load sensing control at an absolute pressure Pa when the operation mode is not a traveling operation, and sets the target differential pressure of the load sensing control at an absolute pressure Pa′ rather than the absolute pressure Pa. In this way, in the actuator operation other than traveling, a necessary actuator speed can be obtained and supplied with the necessary maximum flow rate. In addition, during the combined operation, a flow rate in accordance with the opening area ratios of flow control valves can be distributed to actuators different in load pressure from one another; and energy efficiency is enhanced due to less energy loss during traveling operation.
First claim
Opening claim text (preview).
The invention claimed is: 1. A hydraulic drive system for a construction machine, comprising: an engine; a variable displacement main pump driven by the engine; a plurality of actuators including traveling hydraulic motors, each of the traveling hydraulic motors being driven by hydraulic fluid delivered from the main pump; a plurality of flow control valves including traveling flow control valves, the flow control valves connected to control flow rates of the hydraulic flui…
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Classifications
Fixed Constructions · mapped topic
Mechanical Engineering · mapped topic
- E02F9/2232Primary
Fixed Constructions · mapped topic
Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
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Frequently asked questions
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- What does patent US9200431B2 cover?
- A hydraulic drive system for a construction machine has a travel detection device which detects whether or not the operation mode is a traveling operation and a setting changing device. The setting changing device sets the target differential pressure of load sensing control at an absolute pressure Pa when the operation mode is not a traveling operation, and sets the target differential pressur…
- Who is the assignee on this patent?
- Mori Kazushige, Tsuruga Yasutaka, Takahashi Kiwamu, and 2 more
- What technology area does this patent fall under?
- Primary CPC classification E02F9/2232. Mapped technology areas include Fixed Constructions.
- When was this patent published?
- Publication date Tue Dec 01 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).