EP3705632A1 - Machine de travail mobile - Google Patents

Machine de travail mobile Download PDF

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Publication number
EP3705632A1
EP3705632A1 EP20153680.2A EP20153680A EP3705632A1 EP 3705632 A1 EP3705632 A1 EP 3705632A1 EP 20153680 A EP20153680 A EP 20153680A EP 3705632 A1 EP3705632 A1 EP 3705632A1
Authority
EP
European Patent Office
Prior art keywords
work machine
value
values
increase
designed
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.)
Withdrawn
Application number
EP20153680.2A
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German (de)
English (en)
Inventor
Josef Stock
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Liebherr Werk Bischofshofen GmbH
Original Assignee
Liebherr Werk Bischofshofen GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Liebherr Werk Bischofshofen GmbH filed Critical Liebherr Werk Bischofshofen GmbH
Publication of EP3705632A1 publication Critical patent/EP3705632A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/2058—Electric or electro-mechanical or mechanical control devices of vehicle sub-units
    • E02F9/2062—Control of propulsion units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
    • B66F17/003—Safety devices, e.g. for limiting or indicating lifting force for fork-lift trucks
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/2058—Electric or electro-mechanical or mechanical control devices of vehicle sub-units
    • E02F9/2062—Control of propulsion units
    • E02F9/207—Control of propulsion units of the type electric propulsion units, e.g. electric motors or generators
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/2058—Electric or electro-mechanical or mechanical control devices of vehicle sub-units
    • E02F9/2079—Control of mechanical transmission

Definitions

  • the present invention relates to a mobile work machine, in particular a wheel loader, with a drive motor and with a controller which is designed to read in and / or calculate one or more sensor values relating to the work machine and which is also designed to display the sensor value or values and / or to compare the calculated value or values with limit values or limit value ranges.
  • the present invention is based on the object of developing a mobile work machine of the type mentioned at the outset in such a way that temporarily increased power can be provided.
  • control of the work machine is designed to cause an increase in the drive motor power and / or the tractive force of the work machine and / or the gear torque of the work machine on the basis of the comparison mentioned at the beginning.
  • increase means an increase over the respective nominal values.
  • the controller determines that an increase in engine power is possible and initiates this.
  • the control determines that an increase in transmission torque or an increase in tractive force is possible and initiates this.
  • the operating states such as Pushing on material, e.g. Silage, a digging process, etc. are preferably recognized automatically based on one or more sensor values.
  • Exemplary are sensor variables or input variables of the working hydraulic pressure, the mast position, the shovel position, the device inclination and / or calculated actual values, such as e.g. to name the axle load distribution and / or the tractive effort.
  • These measured or calculated values are compared with predefined conditions, such as threshold or limit values or condition ranges, and if the operating states are completely identical, i.e. if the measured or calculated values are within permissible ranges, a control response is triggered by the control, e.g. the engine power, torque or pulling force increase.
  • control is designed to compare both sensor values and calculated values with respective limit values or limit value ranges and that the control is also designed to increase the drive motor power and / or the tractive force and / or the gear torque on the basis of both comparisons cause. In this case, at least two conditions would have to be met in order to cause the mentioned reduction or increase.
  • the sensor with the minimum or average or maximum value is used as a factor for the increase in power. If, for example, the smallest sensor value is used, it is conceivable that there is an increase of x% compared to the nominal value; for example, the mean value becomes several When sensor values are used, it is conceivable that there is an increase compared to the nominal value in the amount of y%, and if, for example, the largest sensor value is used, it is conceivable that an increase compared to the nominal value of z% occurs.
  • the increase mode i.e. the operating mode in which an increase can take place is preset by default.
  • the increase factor compared to the nominal values is 1, i.e. there is in fact no increase.
  • the parameters whose values can be included are the lifting angle of the work equipment, the tilt angle of the work tool, the working hydraulic pressure of the work equipment and / or the work tool, the traveling speed of the work machine or the inclination of the work machine and / or the mast height or work equipment height.
  • At least one of the calculated values is the axle load distribution of the work machine.
  • the controller can be designed to use the sensor value or values and / or calculated values to determine an operating state of the work machine, e.g. Pushing on material, e.g. To identify silage, digging, etc.
  • the controller prefferably to be designed so that at least one parameter value is detected and that no increase occurs if the parameter value is not corresponds to a target value or does not lie in a target value range, although the comparison of the sensor values and / or the calculated values with limit values or limit value ranges should result in an increase.
  • This parameter has priority over the comparison mentioned.
  • control is designed to increase the drive motor power and / or the tractive force of the work machine and / or the gear torque of the work machine also as a function of the determined operating state of the work machine. In other words, the fact whether and, if so, how an increase occurs in this case also depends on the operating state in which the working machine is located.
  • One of the parameters mentioned is the value of a road driving switch and / or the values of a proximity switch with a grid or one or more suitable sensors that define the off-road operating state.
  • the road travel switch i.e. a switch or the like, active, which signals that the work machine is moving on the road, no increment is made even if the comparison is positive, i.e. when the sensor value (s) and / or the calculated value (s) are in a target range.
  • the control can be designed to define an operating state from the sensor value (s) and / or calculated values, which includes, for example, pushing on material (e.g. silage) or a digging process, whereby also in temporal segments of the digging process (wood chips stacking, e.g. slightly raised lifting frame) Increase in drive power / tractive power.
  • material e.g. silage
  • temporal segments of the digging process wood chips stacking, e.g. slightly raised lifting frame
  • the control can be designed to cause an increase in the drive motor power and / or the tractive force of the work machine and / or the gear torque of the work machine only if the calculated value, in particular the calculated axle load distribution, is in a certain range. If this is not the case, there is no increase in this exemplary embodiment, even if other parameter values are in a desired range.
  • the controller can be designed to change the drive motor power and / or the tractive force of the work machine and / or the gear torque of the work machine linearly as a function of the calculated value. Any other dependency is of course also encompassed by the invention.
  • the calculated value is the axle load distribution
  • the controller being designed to set the drive motor power to a maximum value when the axle load distribution assumes a first value (e.g. 50:50 (front: rear)) and a smaller one Set value as the maximum value if the axle load distribution assumes a second value deviating from the first value.
  • the work machine or its control is designed such that it does not or only allows an increase in the drive motor power and / or the tractive force of the work machine and / or the gear torque of the work machine, if a previous period the increase in one or more of the parameters mentioned or a previous total duration of the increase in one or more of the parameters mentioned or a previous amount of increase in one or more of the parameters mentioned or a previous number of increases in one or more of the parameters mentioned exceeds a limit value.
  • the increase is only carried out in a defined time window and / or only in a time period (i.e. the factor is then set to 1) that is shorter than the time period in which, despite the operating status being recognized and limit values / ranges being observed the comparison is positive.
  • the driver can confirm the increase in one step using a button / switch or a symbol or window on the display, with the power / tractive effort being automatically reduced to the nominal power / tractive effort, in particular with a note, in particular information on the display.
  • the present invention further relates to a method for operating a work machine according to one of claims 1 to 17, wherein one or more sensor values relating to the work machine are read in and / or calculated so that the sensor value (s) and / or the calculated value (s) with limit values or limit value ranges are compared and that based on this comparison there is an increase in the drive motor power and / or the tractive force of the work machine and / or the transmission torque of the work machine.
  • the method preferably has one or more of the steps mentioned in claims 2 to 17.
  • Figure 1 shows an example of a method for changing the power of the work machine carried out by the control of the work machine according to the invention, such as a wheel loader.
  • the process begins with a defined start with the detection of conditions such as threshold values etc.
  • operating states For example, it is / is defined for which measured or calculated values, e.g. Mast angle, tool position etc. a certain operating condition, such as the stockpiling is available.
  • step “Conditions 1" is the definition of the situation detection by defining the sensors and their threshold values and the step “Conditions 2" is the definition of the threshold value ranges for the measured parameters.
  • calculated values means the threshold values or limit value ranges in which the actual values must lie in order to meet a condition. These values can be calculated or they can be fixed.
  • the process ends with a defined end.
  • Figure 2 shows the axle distribution load ALV, which can vary between the values 0% and 100%, whereby the load on the front axle VA and on the rear axle HA together always result in 100%.
  • the reference symbols P represent the engine power of the work machine, ZK its tractive force and M the torque, in particular the gear torque of the work machine.
  • the exemplary values ALV1, ALV2 and ALV 3 lie in a hatched area in which there is an increase in the drive motor power and / or the tractive force of the work machine and / or the gear torque of the work machine. There is no such increase outside of this range.
  • the given, i.e. The hatched area can be stored in the control or can be permanently or repeatedly adapted as required by calculating the axle load distribution.
  • ALV2 is a division of the front and rear axle loads, each with 50% of the total axle loads. As stated, the front and rear axle loads always add up to 100%.
  • ALV1 to ALV2 represent the area of an increased rear axle load.
  • ALV2 to ALV3 represent the area of an increased front axle load.
  • FIG. 3 illustrates the change in engine power depending on the calculated axle load distribution.
  • ALV is calculated as ALV2, i.e. There is a 50:50 axle load distribution, but the engine power is below P2, this is increased to P2 due to the control.
  • ALV1 and ALV3 can differ in terms of performance, e.g. when using different axle sizes.
  • the areas ALV1 and ALV2 or ALV2 and ALV3 can be selected differently. This means that power P1 and / or P3 can be different, i.e. P1 ⁇ P3 or P1> P3, i.e. below the nominal power.
  • transmission torques M or tensile forces ZK can be applied from the entire drive train, i.e. the change in engine power is only exemplary here.
  • additional temporary increases are brought about by means of energy stores, for example flywheel stores, batteries, fuel cells, compressed air or hydraulic stores via additional gear drives.
  • energy stores for example flywheel stores, batteries, fuel cells, compressed air or hydraulic stores via additional gear drives.
  • these variants are complex in terms of integration into the vehicle (additional installation space), control and operation, with the additional effect of energy recovery in relation to wheel loader operations, for example, being manageable.
  • the temporary increase in output in the range of a few percent of the total running time means that enlarged components and enlarged peripheral components, e.g. the cooler, are dispensed with.
  • Additional operating states can be carried out, for example, by including a road switch or querying the functional position of the armrest including steering joystick and / or working hydraulic joysticks using proximity switches and ratchets (toggle switches) on the joystick armrest to assign an off-road operating state.
  • a road switch or querying the functional position of the armrest including steering joystick and / or working hydraulic joysticks using proximity switches and ratchets (toggle switches) on the joystick armrest to assign an off-road operating state.
  • proximity switches and ratchets toggle switches
  • This road travel switch can be any mechanical, electrical switch and / or electronically displayed switch symbol or button that is defined in a display. Additional operating states can also be defined using a door contact switch, for example.
  • the increase in output is only released after the history has been evaluated, with overloading of the drive train being virtually excluded.
  • the power increase is only switched off after the vehicle has been put out of operation, for example "ignition off" or in the event of a sensor error.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Operation Control Of Excavators (AREA)
EP20153680.2A 2019-02-27 2020-01-24 Machine de travail mobile Withdrawn EP3705632A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019105023.5A DE102019105023A1 (de) 2019-02-27 2019-02-27 Mobile Arbeitsmaschine

Publications (1)

Publication Number Publication Date
EP3705632A1 true EP3705632A1 (fr) 2020-09-09

Family

ID=69232771

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20153680.2A Withdrawn EP3705632A1 (fr) 2019-02-27 2020-01-24 Machine de travail mobile

Country Status (2)

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EP (1) EP3705632A1 (fr)
DE (2) DE102019105023A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6052925A (en) 1997-12-22 2000-04-25 Caterpillar Inc. Method for determining the front and rear axle weight of an earth moving machine
US6314727B1 (en) * 1999-10-25 2001-11-13 Caterpillar Inc. Method and apparatus for controlling an electro-hydraulic fluid system
DE102004031248A1 (de) * 2004-06-29 2006-02-09 Plustech Oy Ladegerät
US20090000292A1 (en) * 2007-06-29 2009-01-01 Schifferer Andrew N Method for derating a power source to limit damage
DE102014112534A1 (de) * 2014-09-01 2016-03-03 Claas Selbstfahrende Erntemaschinen Gmbh Dynamisch regelbare Achslastverteilung für eine landwirtschaftliche Arbeitsmaschine
DE102009029559B4 (de) 2008-09-22 2016-12-08 Deere & Company Verfahren zur Auswahl von Leistungskurven eines Motors
DE112017000049T5 (de) 2016-04-08 2018-04-05 Minwa Auto-Protection (Smart Plug) Technology Co., Limited Intelligente Anschlussbuchse und intelligentes system
EP3019387B1 (fr) 2013-07-09 2018-05-23 Liebherr-Werk Bischofshofen GmbH Système de direction électrohydraulique

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005017127B4 (de) * 2005-04-14 2021-09-16 Linde Material Handling Gmbh Verbrennungsmotorisch betriebenes Flurförderzeug mit Überlastschutz

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6052925A (en) 1997-12-22 2000-04-25 Caterpillar Inc. Method for determining the front and rear axle weight of an earth moving machine
US6314727B1 (en) * 1999-10-25 2001-11-13 Caterpillar Inc. Method and apparatus for controlling an electro-hydraulic fluid system
DE102004031248A1 (de) * 2004-06-29 2006-02-09 Plustech Oy Ladegerät
US20090000292A1 (en) * 2007-06-29 2009-01-01 Schifferer Andrew N Method for derating a power source to limit damage
DE102009029559B4 (de) 2008-09-22 2016-12-08 Deere & Company Verfahren zur Auswahl von Leistungskurven eines Motors
EP3019387B1 (fr) 2013-07-09 2018-05-23 Liebherr-Werk Bischofshofen GmbH Système de direction électrohydraulique
DE102014112534A1 (de) * 2014-09-01 2016-03-03 Claas Selbstfahrende Erntemaschinen Gmbh Dynamisch regelbare Achslastverteilung für eine landwirtschaftliche Arbeitsmaschine
DE112017000049T5 (de) 2016-04-08 2018-04-05 Minwa Auto-Protection (Smart Plug) Technology Co., Limited Intelligente Anschlussbuchse und intelligentes system

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Publication number Publication date
DE102019105023A1 (de) 2020-08-27
DE202020106364U1 (de) 2020-11-19

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