Method for controlling a compressed air installation and controller and compressed air installation for employing such a method
US-9828985-B2 · Nov 28, 2017 · US
Hydraulic pump operating device and method for use in hydraulic system
US9017039B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9017039-B2 |
| Application number | US-201013322300-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 29, 2010 |
| Priority date | Oct 14, 2009 |
| Publication date | Apr 28, 2015 |
| Grant date | Apr 28, 2015 |
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Abstract
Official abstract text for this publication.
The rotational frequency of a variable speed motor is set to a normal rotational frequency setting value (N 1 ). A pressure variation range (ΔP) is detected based on a pressure detection value P, of a variable displacement pump, detected by a pressure detector. It is determined whether a determination that the detected pressure variation range (ΔP) is less than or equal to a pressure maintained state detection level (L 1 ) has been continuously given for a period indicated by a timer setting value (T 1 ). If the determination that the detected pressure variation range (ΔP) is less than or equal to the pressure maintained state detection level (L 1 ) has been continuously given for the predetermined period, then it is detected that the current state is a pressure maintained state, and the rotational frequency of the variable speed motor is switched from the normal rotational frequency setting value N 1 to a pressure maintaining rotational frequency setting value (N 2 (<N 1 )).
First claim
Opening claim text (preview).
The invention claimed is: 1. A hydraulic pump operating device for use in a hydraulic system, the hydraulic system including: a variable speed motor; a hydraulic pump driven by the variable speed motor; and a pressure detector configured to detect a discharge pressure of the hydraulic pump, the hydraulic pump operating device comprising: a pressure variation range detector configured to detect a range of variation of the discharge pressure detected by the pressure detector;…
Assignees
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- F04B49/022Primary
Mechanical Engineering · mapped topic
Mechanical Engineering · 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 US9017039B2 cover?
- The rotational frequency of a variable speed motor is set to a normal rotational frequency setting value (N 1 ). A pressure variation range (ΔP) is detected based on a pressure detection value P, of a variable displacement pump, detected by a pressure detector. It is determined whether a determination that the detected pressure variation range (ΔP) is less than or equal to a pressure maintained…
- Who is the assignee on this patent?
- Toyota Toshihisa, Ohtsuka Shuhei, Morikawa Keita, and 2 more
- What technology area does this patent fall under?
- Primary CPC classification F04B49/022. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Apr 28 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).