Method And Device For Controlling A Fluid Actuated Control System

Abstract: ABSTRACT OF THE DISCLOSURE A method and a device for implementing a method for controlling a fluid-actuated control system, for controlling a hydraulically or pneumatically controlled automatic or automated transmission (15) for a motor vehicle, having at least one pressure medium source (1), at least two control elements (2,3) that can be acted upon by pressurized fluid and a control device (5) for controlling the fluid- actuated control system. To minimize the number and power consumption of valves {V1-V8) that have to be actuated simultaneously for controlling the control elements (2,3) and to reduce the mechanical loading of the control elements (1, 2), an additional control module (4) is used, which reads in signals concerning at least one current control action and, in accordance with predetermined patterns and/or calculation rules and/or models, generates signals that cause non-switched control elements (2 or 3) to be acted upon by pressurized working fluid.

Patent Information

Application #

Filing Date

06 November 2008

Publication Number

13/2009

Publication Type

INA

Invention Field

MECHANICAL ENGINEERING

Status

Email

Parent Application

Applicants

ZF FRIEDRICHSHAFEN AG

D-88038, FRIEDRICHSHAFEN

Inventors

1. INGENBLEEK, ROBERT

ZIMBAWEG 7, 88079 KRESSBRONN

2. ULBRICHT, MARKUS

PRINZ-EUGEN-STR. 89, 88069 TETTNANG

3. STEINBORN, MARIO

NIKOLAUSWEG 24, 88046 FRIEDRICHSHAFEN

4. BRENTEL, ARMIN

RUTENSTR. 7, 88097 ERISKIRCH

Specification

[001] METHOD AND DEVICE FOR CONTROLLING A FLUID-ACTUATED CONTROL SYSTEM [002] 1003] [004] The Invention concerns a method and device for controlling a fluid-actuated control system, in particular for fixing the positton of control elements, according to the preamble of claim 1 and a device for implementing the method arelated input and output sections that has bu8>type capabilities is appropriate here. [056] The fluid-actuated control system can be a hydraulic system. This Is advantageous mainly in relation to the avoidance of overlapping pressure pulses because of the incompressibillty of the hydraulic working fluid. Alternatively, the fluid-actuated system can be a pneumatic system, which can be advantageous particularly in relation to the avoidance of resonance oscitlations because of the compressibility of the working medium. 1057] [058] The invention can be explained further with reference to an example embodiment. For that purpose the description of a drawing Is given below. The figure shows a fluid-actuated control system according to the invention, which consists of a pressure medium source 1, in this case in the form of a pressure medium pump, two control elements 2 and 3, and the respective pressure inlet and pressure outflow lines to and from the valves V1 to V8 that control the pressure medium source 1, which are actuated electrically by a control module 4. This control module 4 contains information about control actions together with associated control data for the said control elements 2 and 3 to be actuated by a conventional control device 5. [059] [060] [061] The control elements 2 and 3 are each in the form of postion-cylinder arrangements and each comprises a movable piston 7 and 8 respectively, which can move between abutments A1 and A2 or A3 and A4 in the respective cylinders. The movable pistons 7 and 8 are connected by piston rods 9 and 10 and in each case a thrust deflection device 11 and 12 respectively, to elements of an automated transmission 15 which, when ihey are actuated, bring about a change of the transmission ratio between an input shaft 13 and a drive output shaft 14 of the transmission 15. [052] Whereas the control data for the valves to be actuated that pertain to a switched control element are. if necessary, separated into individual signals and amplified for output to the valves V1 to V8 to be actuated by the control module 4, i.e., in essence only passing through the control module 4, on the basis of information contained by the control unit 5 and further data or signals 6 from electronic equipment and/or sensors and vtrith Vne help of calojlation rules, models or. in the simplest case, a table, the control module determines for the non-switched control elements 2 or 3 whether and, if necessary, when and for how long these should be fixed in position by appropriate actuation of the associated valves V1 to V8 in an actuating direction. [063] Let it be assumed that on the basis of data available to it, the control device 5 initiates a change of the transmission ratio between the input shaft 13 and the output shaft 14 of then automated transmission 15 and that to do this the control element 2 must be actuated so that its movable piston 7 is displaced from the starting position shown, in contact with the abutment A2 to a target position In contact with the abutment A1. [064] The control device 5 assembles these data for the forthcoming control action and transmits them to the control module 4. The latter recognizes the forthcoming control action and determines whether and, if necessary, which non-switched control element, in this case control element 3, has to be fixed In its position. Let it be assumed that the piston 8 of control element 3 tends to be inadvertently displaced during the contnsl action and must therefore be fixed or held in its position in contact with the abutment A4 for a sufficient time by a corresponding pressurization. [065] With the help of calculation rules, in this case stored within the control module and a table, the control module 4 now detenfnines the point in time and the duration for the actuation of valves V3, V4, V7 and V8 of the - in this case -non-switched control element 3 and actuates the valves V1 to V8 in accordance with the data specified by the control device 5 and determined by the control module 4. Thereby, the piston 8 of control element 3 is maintained securely against the abutment A4 whereas the piston 7 of control element 2 is pushed from abutment A2 to abutment A1. Reference rtumerals 1 pressure medium source, pump 2 first control element 3 second control element 4 control module 5 conventional control device 6 further signals, inputs or outputs of the control module 7 piston of the first control element 8 piston of the second control element 9 piston rod of the first control element 10 piston rod of the second control element 11 deflection device of the piston rod of the first control element 12 deflection device of the piston rod of the second control element 13 input shaft of the automated transmission 14 output shaft of the automated transmission 15 automated transmission. VI-V8 valves A1-A4 abutments of the movable pistons of the control elements CLAIMS 1. A method for controlling a fluid-actuated control system, for example controlling a hydraulically or pneumatically controlled automatic or automated transmission (15) for a motor vehicle, with at least one pressure medium source (1), at least two control elements (2, 3) that can be acted upon by fluid under pressure, and with a control device (5) for controlling the fluid-actuated control system, characterized in that an additional control module (4) Is used, which reads in signals concerning at least one cun-ent control action and fi-om them, in accordance with predetemiined patterns, calculation mies and/or models, generates signals that cause non-switched control elements (2 or 3) to be acted upon by a pressurized working fluid. 2. The method according to claim 1, characterized in that the control module (4) generates signals that contain information about at least the non-switched control element(s) (2,3) to be acted upon by pressure and the timing of their pressurization, or brings about such control measures directly by way of suitable signals. 3. The method according to at least one of the preceding claims, characterized in that the control module (4) generates signals containing information about at least the non-switched control element(s) (2, 3) to be pressurized and the duration of their pressurization, or brings about such control measures directly by way of suitable signals. 4. The method according to at least one of the preceding claims, characterized in that the control module (4) additionally reads in further Information (6) and takes it into account when determining the non-switched contrc)! elemente (2,3) to be pressurized and/or the timing and/or the duration of their pressurization. 5. The method according to claim 4, characterized in that the control module (4) additionally reads in furi:her information about the priority for maintaining the position of a control element (2,3) and takes it Into account when determning the non-switched control elements to be pressurized and/orthe timing and/or the duration of their pressurization. 6. The method according to at least one of claims 4 or 5, characterized in that the control module (4) additionally reads in further information about the availability of electrical energy and takes It into account when determining the non-switched control elements (2, 3) to be pressurized and/or the timing and/or the duration of their pressurization. 7. The method according to at least one of claims 4 to 6, characterized in that the control module (4) additionally reads in further information about the pressure and/or volume flow of the working fluid and takes it into account when determining the non-switched control elements (2,3) to be pressurized and/or the timing and/or the duration of their pressurization. 8. The method according to at least one of claims 4 to 7, characterized in that the control module (4) additionally reads in flirther infonnation about the IST-position (actual) of at least one control element (2,3) and takes it into account when determining the non-switched control elements (2, 3) to be pressurized and/or the timing and/or the duration of their pressurization. 9. The method according to claim 8, characterized in that when informed about a discrepancy between the 1ST- (actual) and the SOLL-positions (nominal) of a non-switched control element (2,3), the control module (4) initiates corrective action. 10. The method according to at least one of the preceding claims, characterized in that the control module (4) generates signals that result in pulsed action upon non-switched control elements (2,3) by pressurized working fluid. 11. The fluid-actuated system for implementing the method according to at least one of the preceding claims, having at least one pressure medium source (1) for acting upon a working fluid with a high pressure, at (east two control elements (2. 3) that can be controlled with the help of pressurized working fluid, and a control device (5) for actuating valves (V1 to V8) for controlling and for regulating the pressure in various parts of the fluid-actuated control system, characterized in that a control module (4) is provided, which is designed such that it can read in at least one datum concerning a current control action and, additionally, taking into account predetermined patterns and/or calculation rules and/or models, it can generate signals which result in action upon non-switched control elements by pressurized working fluid. 12. The fluid-actuated control system according to claim 11, characterized in that the fluid-actuated control system Is a hydraulic system or a pneumatic system. 13. The fluid-actuated control system according to claims 11 or 12, ctiaracterized in that to convey the information about a current control action, the control module (4) Is connected via a data or control line to the control device (5) and via further data and/or sensor lines (further signals 6) to other electronic equipment or sensors.

Documents

Application Documents

#	Name	Date
1	6025-chenp-2008 abstract.pdf	2011-09-04
1	6025-chenp-2008 pct.pdf	2011-09-04
2	6025-chenp-2008 claims.pdf	2011-09-04
2	6025-chenp-2008 form-5.pdf	2011-09-04
3	6025-chenp-2008 correspondence-others.pdf	2011-09-04
3	6025-chenp-2008 form-3.pdf	2011-09-04
4	6025-chenp-2008 description(complete).pdf	2011-09-04
4	6025-chenp-2008 form-1.pdf	2011-09-04
5	6025-chenp-2008 drawigns.pdf	2011-09-04
6	6025-chenp-2008 description(complete).pdf	2011-09-04
6	6025-chenp-2008 form-1.pdf	2011-09-04
7	6025-chenp-2008 correspondence-others.pdf	2011-09-04
7	6025-chenp-2008 form-3.pdf	2011-09-04
8	6025-chenp-2008 claims.pdf	2011-09-04
8	6025-chenp-2008 form-5.pdf	2011-09-04
9	6025-chenp-2008 abstract.pdf	2011-09-04
9	6025-chenp-2008 pct.pdf	2011-09-04