WO2012175061A1 - Hydrauliksystem - Google Patents
Hydrauliksystem Download PDFInfo
- Publication number
- WO2012175061A1 WO2012175061A1 PCT/DE2012/000522 DE2012000522W WO2012175061A1 WO 2012175061 A1 WO2012175061 A1 WO 2012175061A1 DE 2012000522 W DE2012000522 W DE 2012000522W WO 2012175061 A1 WO2012175061 A1 WO 2012175061A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- valve
- hydraulic system
- pressure
- valves
- consumer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
Definitions
- the invention relates to a hydraulic system with a system pressure, for supplying a consumer with a consumer pressure, and with a valve device.
- the invention further relates to a method for operating such a hydraulic system.
- proportional pressure valves For adjusting a consumer pressure, for example, a clutch pressure, proportional pressure valves can be used. For safety reasons, the set consumer pressure can be measured and monitored with the aid of a control unit. Conventional proportional pressure valves are designed as slide valves with a pressure feedback to the atmosphere.
- the object of the invention is to reduce or eliminate the idling power consumption and thus basic hydraulic leaks in a hydraulic system according to the preamble of claim 1.
- the object is achieved in a hydraulic system with a system pressure, for supplying a consumer with a consumer pressure, and with a valve device, characterized in that the valve device comprises two valves each having an input and an output whose behavior is strongly coupled.
- the system pressure is provided, for example, via a pressure accumulator or via a pump.
- the consumer pressure is, for example, a clutch pressure or an actuator pressure of a lockable rear differential in a motor vehicle.
- the inventive coupling of the two separate valves can account for a true return of a difference between a control pressure and the ambient pressure.
- a preferred embodiment of the hydraulic system is characterized in that the inputs and the outputs of the valves are coupled to each other in a first approximation by a V-canonic structure.
- the V-canonical structure couples the output of a first valve to the input of a second valve.
- the output of the second valve is coupled to the input of the first valve.
- a further preferred embodiment of the hydraulic system is characterized in that the hydraulic system comprises a control with a decoupling stage.
- the control includes a first sub-controller associated with the first valve and a second sub-controller associated with the second valve.
- the regulation also includes two compensation elements.
- valves are designed as electrically operated solenoid valves whose input is an electric current.
- the solenoid valves preferably each include a solenoid, a pole core, and a magnet armature that is movable relative to the pole core and the solenoid.
- valves are designed as seat valves.
- the poppet valves are cheaper, leak-free and potentially more dynamic than conventional spool valves.
- a first valve is designed as a normally closed pressure build-up valve and a second valve as a normally open pressure reduction valve.
- the first valve is preferably acted upon at a first port to the system pressure.
- the consumer pressure that prevails at a second port or outlet of the first valve increases.
- the consumer pressure is applied to a first connection of the second valve.
- the second valve is closed, a connection between the consumer pressure and the tank is interrupted.
- the tank is preferably connected to a second port or outlet of the second valve.
- Another preferred exemplary embodiment of the hydraulic system is characterized in that the output of the first valve is the consumer pressure and the output of the second valve is a volume flow into a tank.
- the consumer pressure for example a clutch pressure, represents a first target quantity to be adjusted.
- the volume flow in the tank is a second target that needs to be minimized.
- Another preferred embodiment of the hydraulic system is characterized in that the consumer pressure on the input of the second valve and the volume stream are returned to the tank at the entrance of the first valve.
- the consumer pressure acts, for example, on a tip of a magnet armature of the second valve.
- valves each comprise a reciprocating magnet armature with a closing body.
- the armature of the first valve is preferably biased by a valve spring in its closed position.
- the armature of the second valve is biased, preferably by the consumer pressure, in its open position.
- the invention further relates to a method for operating a hydraulic system described above.
- the hydraulic system according to the invention makes it possible to pressurize, for example, a clutch cylinder with two very simple valves in conjunction with an electronic control virtually leak-free.
- Figure 1 is a simplified representation of a hydraulic system according to the invention with a V-canonical structure
- Figure 2 is a similar view as in Figure 1 with a V-canonical structure and a control with decoupling stage;
- Figure 3 shows a first designed as a pressure build-up valve in longitudinal section
- Figure 4 shows a second executed as a pressure reduction valve valve in longitudinal section.
- hydraulic systems are shown simplified, with which a consumer pressure, in particular a clutch pressure can be controlled at the lowest possible power consumption.
- a volume flow between a clutch, in particular a clutch cylinder, and a tank represents the second controlled variable.
- the control according to the invention is intended to be the distance between a desired value and an actual value of the clutch pressure and the volume flow between the clutch and tank to be minimized.
- Manipulated variables or inputs of the control according to the invention are electrical currents which are used to actuate valves. From the electrical currents actuating forces are generated for actuating the valves.
- the hydraulic system according to the invention is strongly coupled, in the sense that a change in a single manipulated variable affects both controlled variables.
- the control according to the invention comprises two stages.
- a first stage serves to convert the coupled hydraulic system into two approximately decoupled subsystems.
- the second stage is the design of a subcontroller for each subsystem.
- the coupled system can be mapped with nonlinear differential equations that have the following properties. Since the clutch is relatively soft and the valves are relatively small, a pressure change due to valve displacements remains low and can be neglected. In addition, the remaining equations can simply be linearized. The resulting linear, time-invariant, coupled differential equations have a so-called V-structure, which is indicated in FIG.
- FIG. 2 inputs or input variables are indicated by arrows 21, 22.
- arrows 23 and 24 outputs or output variables are indicated.
- the hydraulic system shown in Figure 2 comprises, in comparison to the hydraulic system shown in Figure 1, a controller 30 which is indicated by a dashed rectangle.
- a controller 30 which is indicated by a dashed rectangle.
- a first sub-controller is indicated.
- a second sub-controller is indicated.
- rectangles 32 and 33 compensating members are arranged, represent the negative functions to the transfer functions 12 and 13 and serve to eliminate cross-talk. As a result, the hydraulic system is virtually decoupled.
- a first valve 41 is shown in longitudinal section.
- the first valve 41 is designed as a pressure build-up valve with a housing 42 which comprises an outer jacket 44.
- the outer jacket 44 is formed of iron and serves to close a magnetic flux.
- the housing 42 further comprises a holding body 46, which is designed as a thin-walled metal pot and limits a pressure chamber of the valve 41.
- a magnetic coil 48 is arranged between the outer jacket 44 and the holding body 46.
- the solenoid 48 cooperates with a pole core 51, which has the shape of a sleeve with a closed and an open end.
- the sleeve has a cone at its open end.
- a bearing bush 52 is arranged at a small distance from the pole core 51.
- the bushing 52 is disposed between the pole core 51 and a seat plate 53.
- the pole core 51, the bearing bush 52 and the seat plate 53 are fixed to the housing by means of the holding body 46.
- An armature 55 is reciprocable relative to the seat plate 53 in the bearing bush 52 guided. At its lower end in FIG. 3, the magnet armature 55 has a tip 56 which is prestressed against the seat plate 53 by a valve spring 57 which acts on the other end of the magnet armature 55. The tip 56 of the magnet armature 55 serves to release or close a passage hole 58 in the seat plate 53.
- the through-hole 58 connects a port 54 on the underside of the seat plate 53 to an outlet 59 of the valve 41.
- the port 54 of the valve 41 is pressurized with the system pressure.
- the output 59 of the valve 41 is acted upon by the clutch pressure. Normally, the connection between the port 54 and the output 59 is interrupted.
- a second valve 61 is shown in longitudinal section.
- the valve 61 is designed as a pressure reduction valve with a housing 62.
- the housing 62 includes an outer jacket 64 formed of iron to close a magnetic flux.
- the housing 62 further includes a holding body 66, which is designed as a thin-walled metal pot and a Pressure chamber of the valve 61 limited.
- a magnetic coil 68 is arranged in an annular space between the holding body 66 and the outer shell 64.
- the magnetic coil 68 cooperates with a pole core 71 which is arranged between a bearing bush 72 and a seat plate 73.
- the pole core 71, the bearing bush 72 and the seat plate 73 are fixed by means of the holding body 66 fixed to the housing.
- a magnet armature 75 is guided relative to the seat plate 73 by the bushing 72 movable back and forth.
- the magnet armature 75 has a tip 76 which closes or releases a through hole 78 in the seat plate 73.
- the tip 76 of the magnet armature 75 is spaced from the through-hole 78, as shown in FIG. 4, so that a connection between a port 74 on the underside of the seat plate 73 and an outlet 79 of the valve 61 is released.
- the outlet 79 communicates with a tank 80, indicated by a symbol.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE112012002555.5T DE112012002555A5 (de) | 2011-06-20 | 2012-05-22 | Hydrauliksystem |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011105012.8 | 2011-06-20 | ||
| DE102011105012 | 2011-06-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2012175061A1 true WO2012175061A1 (de) | 2012-12-27 |
Family
ID=46513604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DE2012/000522 Ceased WO2012175061A1 (de) | 2011-06-20 | 2012-05-22 | Hydrauliksystem |
Country Status (2)
| Country | Link |
|---|---|
| DE (2) | DE102012208489A1 (de) |
| WO (1) | WO2012175061A1 (de) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19943066A1 (de) * | 1998-09-24 | 2000-03-30 | Bosch Gmbh Robert | Elektromagnetisch betätigbares, hydraulisches Proportionalventil |
-
2012
- 2012-05-22 DE DE201210208489 patent/DE102012208489A1/de not_active Withdrawn
- 2012-05-22 WO PCT/DE2012/000522 patent/WO2012175061A1/de not_active Ceased
- 2012-05-22 DE DE112012002555.5T patent/DE112012002555A5/de not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19943066A1 (de) * | 1998-09-24 | 2000-03-30 | Bosch Gmbh Robert | Elektromagnetisch betätigbares, hydraulisches Proportionalventil |
Non-Patent Citations (2)
| Title |
|---|
| SERGE ZACHER: "Automatisierungstechnik kompakt", 2000, FRIEDRICH VIEWEG & SOHN VERLAGSGESELLSCHAFT MBH, Braunschweig, Wiesbaden, ISBN: 3-528-03897-7, pages: 93 - 109, XP002687288 * |
| SERGE ZACHER: "Übungsbuch Regelungstechnik", January 2007, FRIEDRICH VIEWEG & SOHN VERLAG, Wiesbaden, Germany, ISBN: 978-3-8348-0236-1, pages: 29-32, 123-128, 131-135, XP002687287 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102012208489A1 (de) | 2012-12-20 |
| DE112012002555A5 (de) | 2014-02-27 |
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