IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0158377
(1993-11-29)
|
우선권정보 |
SE-0092064 (1987-05-19) |
발명자
/ 주소 |
- Stenlund Stig (Saltsjbaden SEX)
|
출원인 / 주소 |
- Flutron AB (Tyreso SEX 03)
|
인용정보 |
피인용 횟수 :
16 인용 특허 :
0 |
초록
▼
An electrohydraulic governing system for governing system for governing at least movements of objects (3, 4) actuated by pressure fluid, one at the time or several simultaneously, which can receive or deliver energy, wherein the governing desires from an impulse generating guide means (1) via an ele
An electrohydraulic governing system for governing system for governing at least movements of objects (3, 4) actuated by pressure fluid, one at the time or several simultaneously, which can receive or deliver energy, wherein the governing desires from an impulse generating guide means (1) via an electronic guide unit (2) are performed provided that this is possible in view of limitations in a pressure fluid source (5) delivering pressure fluid to the objects or provided this can be allowed in view of the strength, life and stability of the machine governed by the guide system or by the objects and as long as the functions operate and as long as the guide system or the guided machine is governed within limited secure field, wherein all the time the volume of the different parts or the sytem filled with pressure medium is measured directly or indirectly and upon governing of the pressure medium source and the valve means (8, 13, 15) connected to respective object it is governed so that the pressure fluid source in each moment always delivers a lower volume flow than the flow that the valve means want to deliver to the objects. Moreover, the system includes position transmitters (7, 12, 14) arranged to measure the position of each object and return the measured values to the guide unit (2).
대표청구항
▼
A method for electrohydraulic control of one work element or more than one simultaneously controlled work elements which are supplied with pressure fluid from a common pressure fluid source, each through its valve means, said valve means being connected in parallel to a common pressure conduit from
A method for electrohydraulic control of one work element or more than one simultaneously controlled work elements which are supplied with pressure fluid from a common pressure fluid source, each through its valve means, said valve means being connected in parallel to a common pressure conduit from said pressure fluid source and to a common return conduit of a tank, said method comprising the steps of: 1) feeding outer input control signals from an outer operating means to an electronic control system for desired position, speed and acceleration value for said work elements; 2) supplying said electronic control system with information about the instantaneous position of each of said work elements from position sensing means detecting the position of said work elements; 3) computing, in said electronic control system, instantaneous speed and acceleration of said work elements based on said information about said instantaneous position; 4) calculating an adjusted desired value for a position, speed and acceleration that at the same time is possible, and allowed based on said desired, outer control signals, on predetermined allowed values for position, speed and acceleration for each position, of said work element within its movement field and on pressure fluid source capacity limits, said adjusted desired value thereby being always the same or less that the desired values; 5) comparing, in the electronic control system, the adjusted desired value for position, speed and acceleration with computed instantaneous value for position, speed and acceleration to obtain an output control signal for each work element by increasing or decreasing the valve opening until the work element instantaneous position, speed and acceleration reaches said adjusted desired value; 6) calculating, in the electronic control system the sum of all adjusted desired speed values and the sum of all instantaneous speed value; 7) decreasing the sum of all adjusted speed values by a small marginal amount and comparing said decreased sum with the sum of instantaneous speeds and delivering control signals to the pressure fluid source that will increase the pressure fluid source flow or decrease the pressure fluid source flow based on said comparison, thus all the time trying to adjust the pressure fluid source flow so that said decreased sum is the same or as close as possible to the sum of said instantaneous speeds; and 8) whereby the valve means of the work element which requires the highest pressure assumes an open position so that the substantially low pressure drop over said valve means automatically decreases the pressure in the pressure fluid supply conduit to that substantially corresponding to the highest required work element pressure, such that the position, speed and acceleration of the work element requiring the highest pressure is controlled by the pressure fluid source independent of the valve means.
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