Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H41/00—Rotary fluid gearing of the hydrokinetic type
  • F16H41/24—Details
  • F16H41/30—Details relating to venting, lubrication, cooling, circulation of the cooling medium
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
  • B60T1/02—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels
  • B60T1/08—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels using fluid or powdered medium
  • B60T1/087—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels using fluid or powdered medium in hydrodynamic, i.e. non-positive displacement, retarders
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T10/00—Control or regulation for continuous braking making use of fluid or powdered medium, e.g. for use when descending a long slope
  • B60T10/02—Control or regulation for continuous braking making use of fluid or powdered medium, e.g. for use when descending a long slope with hydrodynamic brake
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
  • F16D57/00—Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders
  • F16D57/04—Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders with blades causing a directed flow, e.g. Föttinger type
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H41/00—Rotary fluid gearing of the hydrokinetic type
  • F16H41/04—Combined pump-turbine units
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H57/00—General details of gearing
  • F16H57/04—Features relating to lubrication or cooling or heating
  • F16H57/0447—Control of lubricant levels, e.g. lubricant level control dependent on temperature
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
  • F16H61/38—Control of exclusively fluid gearing
  • F16H61/48—Control of exclusively fluid gearing hydrodynamic
  • F16H61/64—Control of exclusively fluid gearing hydrodynamic controlled by changing the amount of liquid in the working circuit
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
  • G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
  • G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
  • G01F23/18—Indicating, recording or alarm devices actuated electrically
  • G01F23/185—Indicating, recording or alarm devices actuated electrically for discrete levels

Definitions

• the present invention relates to a method for driving a
• hydrodynamic machine in particular a hydrodynamic retarder, and such a hydrodynamic machine, in particular hydrodynamic retarder.
• the degree of filling of the working space with working medium can be set using various methods.
• a shut-off valve is provided in the inlet to the work area and a control valve in the outlet from the work area. With the shut-off valve, the
• the working medium supply to the work area should be interrupted.
• the control valve With the control valve, the flow cross section in the working medium outlet can be varied in such a way that a more or less large pressure loss in the working medium outlet and, above that, the working medium quantity and the working medium pressure in the working space are set.
• a working medium storage container with a working medium supply is provided, which with a predetermined variable control pressure
• Working medium also serve as a lubricant for the hydrodynamic machine, for example for lubricating the bearings.
• the present invention is therefore based on the object of specifying a method for controlling a hydrodynamic machine and a corresponding hydrodynamic machine in which an insufficient fill level of the working medium supply in the working medium container is recognized.
• the invention is to be characterized by a low outlay on equipment.
• the object of the invention is achieved by a method with the features of claim 1 and a hydrodynamic machine with the features of
• the hydrodynamic machine according to the invention is designed in particular as a hydrodynamic retarder.
• the method according to the invention is applied to a hydrodynamic machine which has a bladed primary wheel and a bladed secondary wheel, which together form a working space which can be filled with working medium from a working medium supply in a working medium storage container, by forming a working medium circuit in the working space
• a control pressure being applied to the working medium supply in order to displace the working medium from the working medium supply into the working space.
• the hydrodynamic machine is a hydrodynamic retarder, in particular only the primary wheel with inspection is rotating, while the secondary wheel with inspection is stationary in order to brake the primary wheel hydrodynamically.
• a retarder with a secondary wheel driven in opposite directions to the primary wheel can also be considered.
• a hydrodynamic machine that acts as a hydrodynamic clutch or
• the primary wheel drives the secondary wheel hydrodynamically, optionally with the interposition of at least one stator or guide vane ring positioned in the working space.
• an increase in pressure in the working medium supply container is at least indirectly detected and a filling level of the working medium supply in the working medium container is determined as a function of the recorded pressure increase.
• a warning message in particular an acoustic and / or an optical warning message, if an adequate fill level of the working medium supply in the working medium container is not determined. Additionally or alternatively, it is possible to block future activation of the hydrodynamic machine until a sufficient fill level is established or detected again.
• a single pressure value is recorded in the working medium reservoir and compared with a predetermined reference value or a predetermined reference range.
• a pressure curve is recorded and compared with a predetermined reference pressure curve.
• the pressure value or the pressure curve can be compared with an
• such a pressure sensor can also be provided at another position, for example in a connecting line for working medium, which on the one hand opens into the working medium storage container and on the other hand at least indirectly into the working area.
• a connecting line for working medium which on the one hand opens into the working medium storage container and on the other hand at least indirectly into the working area.
• an indirect detection of the pressure increase in the working medium reservoir is also possible by detecting other sizes and determining the pressure increase from these other sizes.
• a vehicle driver is particularly preferably informed by an appropriate display when the availability of the hydrodynamic machine is no longer available. This can be done, for example, via a vehicle display.
• the pressure increase is based on (at least) one individual
• a pressure in the working medium reservoir is changed a predetermined time after the start of the application of the control pressure or after the application of a control pressure
• the fill level is too low if the detected pressure is below the predetermined limit value or a limit range including the limit value.
• the hydrodynamic machine can be operated using a
• Switch-on command from a vehicle driver or a control device can be activated by filling the work area with working medium and by means of a corresponding switch-off command by emptying the work area
• control pressure being applied to the working medium supply after detecting the switch-on command in order to bring about a predetermined degree of filling of the working space.
• Working medium supply in the working medium storage container can additionally be in a deactivated state, that is to say without detecting a switch-on command or when there is no switch-on command
• Control pressure are applied to the working medium supply to determine the level.
• the pressure in the activated state of the hydrodynamic machine can then Storage containers are detected and used to control or regulate the
• the working medium reservoir is free of a float for detecting the fill level of the working medium reservoir.
• a predetermined fill level of the working medium reservoir in order to determine the limit value in the working medium reservoir, a predetermined fill level of the working medium
• Working medium supply set and a predetermined control pressure applied to the working medium supply for the predetermined period of time After the specified period of time has elapsed, the pressure in the working medium reservoir is at least indirectly recorded and specified as a limit value. A calibration is thus carried out.
• a reference pressure curve is specified over the time period and a pressure curve in
• a hydrodynamic machine has a control device which is set up to carry out a method according to the invention, so that by applying the control pressure to the working medium supply
• Pressure increase in the working medium storage container can be detected at least indirectly and a fill level of the depending on the detected pressure increase
• Working medium supply can be determined in the working medium storage container.
• the invention will be described below by way of example using an exemplary embodiment and the figures.
• a hydrodynamic machine in the form of a hydrodynamic retarder 10 is shown schematically in FIG. This has a means of
• a working medium circuit 8 is generated in a working space 3 formed by the primary wheel 1 and the secondary wheel 2, by means of which torque or drive power is transmitted from the primary wheel 1 to the secondary wheel 2, whereby the primary wheel 1 and thus the drive shaft 7 are braked .
• a hydrodynamic retarder 10 is, for example, part of a motor vehicle drive train.
• the hydrodynamic machine in general, here the hydrodynamic retarder 10, has an external working medium circuit 9, with a
• a correspondingly predetermined control pressure is applied to the working medium level of the working medium supply 4 in the working medium supply container 5.
• a control valve here in the form of a
• Proportional valve 12 is provided, which is positioned in a control air line 13 between a compressed air source 14 and the air space in the working medium reservoir 5.
• the proportional valve 12 is controlled by a control device 15 so that it sets the desired control pressure in accordance with the required braking torque.
• the hydrodynamic retarder 10 is activated in that after
• Vehicle control device transmission control device of a vehicle transmission, not shown here, of a motor vehicle drive train, the component of which is the retarder 10, or retarder control device
• Control device 15 actuates the proportional valve 12 and thereby the work chamber 3 of the previously largely empty in the deactivated state
• the control device 15 can be a component of the vehicle control device, transmission control device or
• a pressure sensor 6 is provided, which detects the pressure in the working medium reservoir 5. The detected pressure is processed in the control device 15, for example.
• the fill level of the working medium supply 4 in the working medium supply container 5 can vary. So the level decreases when in operation
• Working medium in the hydrodynamic retarder 10 is lost due to leaks. This can result in a lower fill level in the working medium reservoir 5 to adjust. This is shown by the dashed line of the working medium level. In order to ensure proper functioning and proper lubrication of the hydrodynamic retarder 10, however, a minimum fill level in the working medium reservoir 5 must be maintained.
• Determining the working medium reservoir 5 is, preferably when the hydrodynamic retarder 10 is deactivated (generally when the hydrodynamic machine is deactivated), with the proportional valve 12 in cooperation with the
• Compressed air source 14 a predetermined control pressure in the
• Working medium reservoir 5 directed and it is detected with the pressure sensor 6, which actual pressure is established after a predetermined period of time. Additionally or alternatively, the pressure curve that arises during this predetermined period of time can also be detected with the pressure sensor 6.
• the recorded pressure or the recorded pressure curve is compared with a limit value of the pressure or a reference pressure curve and the fill level is determined from this. This is possible because with a lower fill level there is a larger air volume in the working medium reservoir 5, which is sealed pressure-tight from the environment, the air volume being compressible. With a low fill level, it therefore takes comparatively longer until the pressure builds up in the working medium reservoir 5. Thus, the pressure obtained after the expiration of a
• predetermined time span or from the pressure curve also the current fill level of the working medium reservoir 4 in the working medium reservoir 5.
• FIG. 2 shows a diagram of the control pressure rg generated or made available by the proportional valve 12 over the course of time for a method according to the invention.
• the proportional valve 12 opens (see FIG. 1) and acts on it
• a comparatively high fill level is set after the time period At, a comparatively high detected pressure pist or a comparatively high detected pressure curve pist over the time period At.
• a comparatively low fill level accordingly results in a lower detected pressure or pressure curve p'ist, which is shown here in dashed lines.
• the detected pressure or pressure curve can be compared with a limit value piim or reference pressure curve p ref , shown here in a chain line. Is the recorded pressure
• the fill level is too low.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Transportation (AREA)
• General Physics & Mathematics (AREA)
• Transmission Of Braking Force In Braking Systems (AREA)
• Valves And Accessory Devices For Braking Systems (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (6)

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Family Cites Families (15)

• 2019
  • 2019-01-10 DE DE102019100485.3A patent/DE102019100485A1/de active Pending
  • 2019-10-18 WO PCT/EP2019/078311 patent/WO2020143938A1/de unknown
  • 2019-10-18 BR BR112021013419-0A patent/BR112021013419A2/pt unknown
  • 2019-10-18 EP EP19790505.2A patent/EP3908769A1/de active Pending
  • 2019-10-18 CN CN201980088222.4A patent/CN113272578A/zh active Pending
• 2021
  • 2021-07-09 US US17/371,615 patent/US11590947B2/en active Active

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