Power source apparatus and hybrid construction machine equipped with same
US-9032726-B2 · May 19, 2015 · US
Hybrid working machine
US9702379B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9702379-B2 |
| Application number | US-201314387278-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 19, 2013 |
| Priority date | May 1, 2012 |
| Publication date | Jul 11, 2017 |
| Grant date | Jul 11, 2017 |
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- Title
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Abstract
Official abstract text for this publication.
Pressure sensors are provided to detect the delivery pressure of a hydraulic pump, the output pressure of an engine revolution speed detecting valve, and the output pressure of a differential pressure reducing valve generating the differential pressure between the delivery pressure of the hydraulic pump and a maximum load pressure. A vehicle controller calculates virtually the displacement of the hydraulic pump by use of the detected pressures and an equation of motion about a swash plate of the hydraulic pump, calculates the power need of the hydraulic pump and the output of the engine using these values, and switches a motor between powering and generation control in accordance with the result of a comparison between the pump power need and the engine output. In this manner, the displacement of the hydraulic pump without using sensors to detect the tilting angle of the swash plate of the hydraulic pump.
First claim
Opening claim text (preview).
The invention claimed is: 1. A hybrid working machine comprising: an engine; a hydraulic pump driven by the engine; a motor which drives the hydraulic pump in combination with the engine; a plurality of actuators driven by hydraulic fluid delivered by the hydraulic pump; a pilot pump driven by the engine; a pilot hydraulic power source connected to the pilot pump to generate a pilot primary pressure based on delivery fluid from the pilot pump; an engine revolution spee…
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Mechanical Engineering · mapped topic
Operations & Transport · mapped topic
Fixed Constructions · mapped topic
Mechanical Engineering · mapped topic
Fixed Constructions · mapped topic
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Frequently asked questions
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- What does patent US9702379B2 cover?
- Pressure sensors are provided to detect the delivery pressure of a hydraulic pump, the output pressure of an engine revolution speed detecting valve, and the output pressure of a differential pressure reducing valve generating the differential pressure between the delivery pressure of the hydraulic pump and a maximum load pressure. A vehicle controller calculates virtually the displacement of t…
- Who is the assignee on this patent?
- Hitachi Construction Machinery Tierra Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification F15B11/16. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Jul 11 2017 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 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).